Document ID: OSHA-2020-0001-0002
Agency: osha
Document Type: Notice
Title: STP Nuclear Operating Company; Grant of Permanent Variance
Posted Date: 2021-04-28T04:00Z

[Federal Register Volume 86, Number 80 (Wednesday, April 28, 2021)]
[Notices]
[Pages 22458-22466]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2021-08812]

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DEPARTMENT OF LABOR

Occupational Safety and Health Administration

[Docket No. OSHA-2020-0001]

STP Nuclear Operating Company; Grant of Permanent Variance

AGENCY: Occupational Safety and Health Administration (OSHA), Labor.

ACTION: Notice.

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SUMMARY: In this notice, OSHA grants a permanent variance to South 
Texas Project Nuclear Operating Company (STP Nuclear) from the OSHA 
standard that requires the isolation of permit-required confined 
spaces.

[[Page 22459]]

DATES: The permanent variance specified by this notice becomes 
effective on May 28, 2021 and shall remain in effect until it is 
modified or revoked, whichever occurs first.

FOR FURTHER INFORMATION CONTACT: Information regarding this notice is 
available from the following sources:
    Press inquiries: Contact Mr. Frank Meilinger, Director, OSHA Office 
of Communications, U.S. Department of Labor, telephone: (202) 693-1999; 
email: meilinger.francis2@dol.gov.
    General and technical information: Contact Mr. Kevin Robinson, 
Director, Office of Technical Programs and Coordination Activities, 
Directorate of Technical Support and Emergency Management, Occupational 
Safety and Health Administration, U.S. Department of Labor, phone: 
(202) 693-2110 or email: robinson.kevin@dol.gov.

SUPPLEMENTARY INFORMATION: 
    Copies of this Federal Register notice: Electronic copies of this 
Federal Register notice are available at http://www.regulations.gov. 
This Federal Register notice and other relevant information are also 
available at OSHA's web page at http://www.osha.gov.

I. Notice of Application

    On February 18, 2019, South Texas Project Nuclear Operating Company 
(STP Nuclear or the applicant), 12090 FM 521, Wadsworth, Texas 77483, 
submitted under Section 6(d) of the Occupational Safety and Health Act 
of 1970 (OSH Act; 29 U.S.C. 655) and 29 CFR 1905.11 (``Variances and 
other relief under section 6(d)'') an application for a permanent 
variance from the provision of the OSHA standard that regulates 
ensuring isolation of permit-required confined spaces, as well as a 
request for an interim order pending OSHA's decision on the application 
for variance (OSHA-2020-0001-0001) at its Wadsworth, Texas facility. 
Specifically, STP Nuclear seeks a variance from the provision of 29 CFR 
1910.146 that requires ``isolation of permit space,'' meaning the 
process by which a permit-required space is removed from service and 
completely protected against the release of energy and material into 
the space (29 CFR 1910.146(b) and 29 CFR 1910.146(d)(3)(iii)). STP 
Nuclear's application also requested an interim order pending OSHA's 
decision on the application for a variance.
    According to the application, STP Nuclear operates two pressurized 
water reactor nuclear power plants at its Wadsworth, Texas location. 
STP Nuclear's description of its operation indicates that these nuclear 
power plants use steam to drive turbine generators, which is cooled by 
circulating water through a condenser to convert the steam back into 
water. STP Nuclear uses a circulating water system (CWS) that cools the 
steam by pumping water from the main cooling reservoir (MCR), through 
the condenser and back to the reservoir. The MCR is 7,000 acres and 
includes an intake structure where pumps that provide cooling to the 
units are located. These pumps include the circulating water (CW) 
pumps, of which there are a total of eight (four per unit). The flow 
from each CW pump discharges through a motor operated valve into a 96 
foot diameter pipe which passes over the reservoir embankment at 59 
feet elevation. The four pump discharge pipes combine into two 138 inch 
underground pipes that feed a manifold in the Turbine Generator 
Building (TGB). The circulating water flows through condenser tubes 
inside what STP Nuclear refers to as the ``water box.'' The manifold 
supplies water to each of the six main condenser water boxes with an 84 
inch motor-operated valve at the inlet and outlet of each water box. 
The water exiting the water boxes enters a discharge manifold which 
then splits into two underground 138 inch pipes returning the water to 
the MCR passing over the reservoir embankment at 58 feet elevation. The 
applicant asserts that the design of the CWS is such that it cannot be 
completely removed from service for water box cleaning or tube repair, 
and that maintenance activities occur when one of the two Power Plants 
are removed from service for refueling, which happens once every 
eighteen months.
    The condenser water box is a permit-required confined space that 
under STP Nuclear's procedures and OSHA's standard at 29 CFR 1910.146 
require a confined-space permit and security alerts prior to entry. 
Employees can enter the water boxes to clean condenser tubes and to 
repair or plug leaking tubes only after being cleared by the STP 
Nuclear Entry Supervisor in accordance with STP Nuclear's confined 
space procedure. STP Nuclear performs maintenance on condenser water 
boxes prior to the summer months to ensure maximum efficiency, and 
therefore, maximum generation during the peak electric generating 
period in Texas. This maintenance activity (tube cleaning) minimizes 
fouling and blocking of the condenser tubes. Employees entering the 
water box to perform maintenance and repair activities could be exposed 
to the hazard of engulfment by water that could flow into the water box 
if condenser isolation valves were to rotate or otherwise fail during 
the maintenance or repair activity.
    STP Nuclear asserts that without frequent maintenance, the 
condenser tubes could leak and introduce contaminants, such as sodium, 
into plant systems that can erode barriers that prevent release of 
radioactive materials. Further, STP Nuclear asserts that if the water 
box cannot be timely isolated to repair tubes, it may have to shut down 
the nuclear power plant, which will cause interruption to the power 
supply. STP Nuclear previously believed that procedures already in 
place--lockout/tagout of the isolation valve, continuous monitoring for 
leakage past the valve and standby attendant--were adequate to protect 
employees.
    On March 22, 2018, OSHA received a complaint alleging that STP 
Nuclear failed to ensure isolation of the condenser water box as 
required by OSHA's permit-required confined space standard. In response 
to this complaint, STP Nuclear submitted a letter, dated March 28, 
2018, to OSHA's Corpus Christi, Texas Area Office (OSHA-2020-0001-
0002), asserting its belief that they are in full compliance with 29 
CFR 1910.146 and describing their current practices to comply with the 
standard. On April 20, 2018, the Corpus Christi, Texas OSHA Area Office 
provided a response to STP Nuclear's explanation stating that it was 
feasible to install two 5,000 pound blank flanges to isolate the system 
and directed STP Nuclear to take corrective action (OSHA-2020-0001-
0003).
    In STP Nuclear's February 18, 2019, variance application, the 
applicant asserts that isolating the water box using blank flanges 
creates a greater hazard and significant risk for injury. Further, the 
applicant believes that installing blank flanges has the potential to 
compromise the structural integrity of the system. To ensure isolation 
of the condenser water box prior to maintenance activities, STP Nuclear 
proposes in its variance application an alternative safety measure--
drilling four holes into the 99.75 inch diameter upper valve flange, 
and fabrication of 20 three-fourth inch diameter mechanical stops (stop 
pins), which will be installed to block movement of the butterfly valve 
disc to ensure isolation of the water boxes during maintenance work.
    OSHA initiated a technical review of STP Nuclear's variance 
application and developed a set of follow-up questions on June 9, 2019 
(OSHA-2020-0001-0003), regarding the assertions of equivalent worker 
protection included

[[Page 22460]]

in the application. On June 27, 2019, STP Nuclear provided written 
answers to the follow-up questions, (OSHA-2020-0001-0004) as well as 
supplemental materials to support the variance application including: A 
Hazard and Operability Study report and recommendations (hazard 
analysis using a ``HAZOP'' methodology); a copy of all detailed 
procedures used when employees are entering or inside the water box; 
and a copy of emergency procedures and equipment used while employees 
are working inside the water box.
    In reviewing the application, OSHA evaluated the use of two blank 
flanges, a 99.5 inch diameter, 2.5 inch thick steel blank weighing 
5,563 pounds each to isolate the condenser water boxes during 
maintenance activities. The applicant asserted in the variance 
application that installing a blank flange to isolate a condenser water 
box creates a greater hazard and significant risk for injury to both 
personnel and the physical building. STP Nuclear asserts that 
installing a blank flange requires removal of the water box inlet and 
outlet expansion joints and installation of two steel blanks. 
Installing the blank flanges as described above entails a high degree 
of risk, as it would require moving these heavy objects from the 
building entrance to the water box, using rigged chain falls to trapeze 
the blanks to the water box, as well as construction of a support 
structure for the water box, in order to support the additional weight 
of the 5,563 pound blanks and ensure the water box and/or inlet pipe 
does not misalign from removal of the expansion joint. Further, OSHA 
carefully reviewed the administrative and engineering controls outlined 
in the variance application and supplemental materials as part of the 
proposed alternative work practices identified in the variance 
application.
    OSHA reviewed STP Nuclear's application for the variance and 
interim order and determined that they were appropriately submitted in 
compliance with the applicable variance procedures in Section 6(d) of 
the Occupational Safety and Health Act of 1970 (OSH Act, 29 U.S.C. 
655(d)) and OSHA's regulations at 29 CFR 1905.11 (``Variances and other 
relief under section 6(d)''), including the requirement that the 
applicant inform workers and their representatives of their rights to 
petition the Assistant Secretary of Labor for Occupational Safety and 
Health for a hearing on the variance application.
    Following this review and discussions with STP Nuclear, OSHA 
determined that STP Nuclear's proposed alternative, subject to the 
conditions in the request and imposed by the Interim Order, provides a 
workplace as safe and healthful as that required by the permit-required 
confined space standard. On September 1, 2020, OSHA published a Federal 
Register notice announcing STP Nuclear's application for a permanent 
variance, stating the preliminary determination along with the basis of 
that determination, and granting the Interim Order (86 FR 54424). OSHA 
requested comments on each.
    OSHA did not receive any comments or other information disputing 
the preliminary determination that the alternative was at least as safe 
as OSHA's standard, nor any objections to OSHA granting a permanent 
variance. Accordingly, through this notice OSHA grants a permanent 
variance subject to the conditions set out in this document.

II. The Variance Application

A. Background

    STP Nuclear's variance application and the responses to OSHA's 
follow-up questions provided the following: Detailed descriptions of 
the condenser water box maintenance process; the proposed work 
alternative to isolate the condenser water box using stop pins while 
performing maintenance activities; and procedures developed to manage 
the permit-required confined space. Additionally, STP Nuclear provided 
a HAZOP study as technical evidence supporting STP Nuclear's assertion 
of equivalency of worker protection.
    As an alternative to installation of blank flanges, STP Nuclear 
proposes a comprehensive engineered system and appropriate 
administrative controls to satisfy the isolation requirement. The 
engineered system uses mechanical stops (stop pins) to block the 
movement of the butterfly valve disk in combination with administrative 
procedures to isolate the condenser water box in order to perform 
maintenance activities. The stop pins function as the isolation device, 
in that utilizing the stop pins prevents the engagement of the 
condenser water box, thus interrupting the flow of water to the 
condenser water boxes to allow maintenance activities. STP Nuclear 
asserts that using stop pins to isolate butterfly valve disks in 
condenser water boxes match the requirements of 29 CFR 
1910.146(d)(3)(iii).
    Further, STP Nuclear asserts that its mechanical stop system has 
been evaluated via a HAZOP study, which is a process that seeks to 
identify potential operating hazards and risks in systems/processes. 
The HAZOP study included a Failure Modes and Effects Analysis (FMEA) 
that was developed and documented. The FMEA is an assessment of the 84 
inch butterfly valves in the closed position, with stop pins installed, 
to physically isolate the condenser water box while the remainder of 
the CWS remains in operation. The HAZOP study seeks to identify the 
potential hazardous scenarios, as they relate to personnel entry into 
the isolated water box, to determine potential areas of concern, 
especially regarding a possible engulfment hazard. Issued June 20, 2019 
(OSHA-2020-0001-0004), the HAZOP study included eight recommendations 
for additional engineering and administrative controls, all of which 
have been adopted by STP Nuclear. These recommendations are described 
in Proposed Condition D of this notice.
    STP Nuclear contends that the administrative and engineering 
controls comprising the alternative safety measures included in the 
variance application provide the workers with a place of employment 
that is at least as safe and healthful as they would obtain under the 
provisions of OSHA's permit-required confined space standard.

B. Variance From 29 CFR 1910.146(b) and 29 CFR 1910.146(d)(3)(iii)

    As an alternative means of compliance with the isolation 
requirements of Sec. Sec.  1910.146(b) and 1910.146(d)(3)(iii), STP 
Nuclear is proposing to use a comprehensive system of engineering and 
administrative control procedures. The engineering controls include (1) 
a modification of the condenser isolation valves to drill four holes 
into the 99.75 inch diameter upper valve flange, to allow the 
installation of mechanical stops (``stop pins'') which block rotation 
of the isolation valve disks, (2) utilizing a physical lock on the 6 
inch cross-tie valves, and (3) utilization of automated drains that 
provide a secondary means of evacuating water leakage from the isolated 
water box connected piping. STP Nuclear has also established 
administrative controls to support the use of the stop pin system, 
including: (1) Continuous monitoring for leakage past the isolation 
valve, (2) utilizing a dedicated water box drain pump operator while 
personnel are inside the isolated water box, (3) utilizing a standby 
attendant to aid in the evacuation of an employee working in the 
condenser water box in the event of an emergency, and (4) a dedicated 
emergency evacuation procedure.
    Further, the applicant asserts that: (1) Full isolation of the 
water boxes would create a greater hazard to its employees,

[[Page 22461]]

and (2) the continuous water system makes shutdown of the water supply 
impossible. Shutting down the circulating water system could 
potentially cause the nuclear power plant to leak radiation, which is a 
significant public health hazard.

C. Technical Review

    OSHA conducted a review of STP Nuclear's application and the 
supporting technical documentation. After completing the review of the 
application and supporting documentation, OSHA concludes that STP 
Nuclear:
    1. Has a permit-required confined space entry program;
    2. Performed a hazard analysis using the Hazard and Operability 
Study (``HAZOP'') methodology to assess the risks of entering condenser 
water boxes to perform maintenance on condenser tubes;
    3. Implemented controls recommended in the HAZOP study (outlined in 
Proposed Condition D of this notice);
    4. Established procedures for condenser water box online isolation 
and restoration;
    5. Has developed the Condenser Water Box Online Isolation and 
Restoration procedure to remove condenser water boxes from service for 
maintenance;
    6. Has modified or will modify the isolation valve seats in 
condenser water boxes by installing specified mechanical stops (``stop 
pins''). These stop pins are inserted downstream of the inlet disc and 
upstream of the outlet disc following condenser water box isolation and 
drain down;
    7. Implemented detailed administrative procedures designed to 
provide additional safety measures for all employees working on or near 
condenser water boxes, which include having a watch stander present at 
all times, as well as emergency evacuation procedures in the event that 
water begins flowing into isolated condenser water boxes;
    8. Procured and provided appropriate equipment and supplies;
    9. Made the alternative isolation control policies and procedures 
available to employees;
    10. Trained authorized and affected employees on the application of 
the alternative work practice and associated isolation control policies 
and procedures;
    11. Developed additional administrative controls and procedures to 
minimize the potential for authorized and affected employees to work 
around isolated condenser water boxes;
    12. Conducted a comparison of the blank flange versus use of stop 
pins, which mechanically limits disc travel providing additional 
personnel safety against engulfment;
    13. Has effective emergency rescue procedures to quickly and 
effectively evacuate workers within the condenser water box, including 
a rescue team present on site during maintenance activities; and
    14. Conducted a Failure Modes and Effects Analysis, which was an 
assessment of the 84 inch butterfly valves in the closed position.

III. Description of the Conditions Specified by the Permanent Variance

    As previously indicated in this notice, OSHA conducted a review of 
STP Nuclear's application and supporting documentation. OSHA determined 
that STP Nuclear developed and proposed to implement effective 
alternative means of protection that provides protection to their 
employees ``as safe and healthful'' as protections required within 
paragraph 29 CFR 1910.146(d)(3)(iii) of OSHA's permit-required confined 
space isolation standard during the process of performing maintenance 
on condenser water boxes. Therefore, on September 1, 2020, OSHA 
published a Federal Register notice announcing STP Nuclear's 
application for a permanent variance and interim order, grant of an 
interim order, and request for comments (86 FR 54424). The agency 
requested comments by October 1, 2020, and OSHA received no comments in 
response to this notice.
    During the period starting with the September 1, 2020, publication 
of the preliminary Federal Register notice announcing grant of the 
Interim Order until the agency modifies or revokes the Interim Order or 
makes a decision on the application for a permanent variance, the 
applicant was required to comply fully with the conditions of the 
Interim Order as an alternative to complying with the requirements of 
paragraph 29 CFR 1910.146(d)(3)(iii). As of the effective date of this 
notice, OSHA is revoking the Interim Order granted to the employer on 
September 1, 2020.
    This section describes the conditions that comprise the alternative 
means of compliance with 29 CFR 1910.146(b) and 29 CFR 
1910.146(d)(3)(iii). These conditions form the basis of the permanent 
variance that OSHA is granting to STP Nuclear.
Condition A: Scope
    The scope of the permanent variance limits coverage to the working 
conditions specified under this condition. Clearly defining the scope 
of the permanent variance provides STP Nuclear, their employees, 
potential future applicants, other stakeholders, the public, and OSHA 
with necessary information regarding the work situations which the 
permanent variance will cover. To the extent that STP Nuclear conducts 
work outside the scope of this variance, it will be required to comply 
with OSHA standards, including the isolation of permit-required 
confined spaces.
    Pursuant to 29 CFR 1905.11, an employer (or class or group of 
employers) may request a permanent variance for a specific workplace or 
workplaces. When OSHA approves a permanent variance, it applies only to 
the specific employer(s) that submitted the application and only to the 
specific workplace or workplaces designated as part of the project. In 
this instance, OSHA's grant of a permanent variance applies only to the 
applicant, STP Nuclear, and only at the Wadsworth, Texas nuclear plant. 
The permanent variance does not apply to any other employers or STP 
Nuclear locations outside of the Wadsworth, Texas facility.
Condition B: List of Abbreviations
    The following abbreviations apply to this permanent variance:

1. CFR--Code of Federal Regulations
2. CWS--Circulating Water System
3. ECO--Equipment Clearance Order
4. FMEA--Failure Modes and Effects Analysis
5. HAZOP--Hazard and Operability Study
6. MCR--Main Cooling Reservoir
7. OSHA--Occupational Safety and Health Administration
8. OTPCA--Office of Technical Programs and Coordination Activities
9. RRP--Rope Rescue Program
10. TGB--Turbine Generator Building
Condition C: List of Definitions
    The permanent variance includes definitions for a series of terms. 
Defining these terms serves to enhance the applicant's and the 
employees' understanding of the conditions specified by the permanent 
variance.
    1. Affected employee or worker--an employee or worker who is 
affected by the conditions of this permanent variance, or any one of 
his or her authorized representatives. The term ``employee'' has the 
meaning defined and used under the Occupational Safety and Health Act 
of 1970 (29 U.S.C. 651 et seq.).
    2. Competent person--an individual who is capable of identifying 
existing and predictable hazards in the

[[Page 22462]]

surroundings or working conditions that are unsanitary, hazardous, or 
dangerous to employees, and who has authorization to take prompt 
corrective measures to eliminate them.
    3. Engulfment--the surrounding and effective capture of a person by 
a liquid or finely divided (flowable) solid substance that can be 
aspirated to cause death by filling or plugging the respiratory system 
or that can exert enough force on the body to cause death by 
strangulation, constriction, or crushing.
    4. Hazard and Operability Study--an evaluation of tasks or 
operations to identify potential hazards and to determine the necessary 
controls.
    5. Isolation--the process by which a permit space is removed from 
service and completely protected against the release of energy and 
material into the space by such means as: Blanking or blinding; 
misaligning or removing sections of lines, pipes, or ducts; a double 
block and bleed system; lockout or tagout of all sources of energy; or 
blocking or disconnecting all mechanical linkages.
    6. Permit-required confined space--a confined space that has one or 
more of the following characteristics: (1) Contains or has a potential 
to contain a hazardous atmosphere; (2) Contains a material that has the 
potential for engulfing an entrant; (3) Has an internal configuration 
such that an entrant could be trapped or asphyxiated by inwardly 
converging walls or by a floor which slopes downward and tapers to a 
smaller cross-section; or (4) Contains any other recognized serious 
safety or health hazard.
    7. Qualified person--an individual who, by possession of a 
recognized degree, certificate, or professional standing, or who, by 
extensive knowledge, training, and experience, successfully 
demonstrates an ability to solve or resolve problems relating to 
maintenance of condenser water boxes.
Condition D: Safety Practices and Procedures
    This condition requires that STP Nuclear (1) adhere to the 
Condenser Water Box Online Isolation and Restoration Procedure provided 
to OSHA with the Variance application and (2) implement the hazard 
prevention and control requirements provided with the Variance 
application to ensure the continued effective functioning of the 
alternate work practice (use of stop pins) to isolate condenser water 
boxes before performing maintenance activities. Further, STP Nuclear 
must implement the following additional administrative controls 
identified in the HAZOP study:
    1. Close the cycle inlet and butterfly valves with a local 
handswitch.
    2. Remove power from the inlet and isolation valve and hang Danger 
Tags on the local handswitch and the breaker.
    3. Drain the condenser water box to another condenser water box 
using the permanent installed condenser drain down pumps.
    4. Check for leakages past the isolation valve seat. In the event 
that a leak is found, STP Nuclear will use a handwheel to manually 
achieve proper disk seating and ensure that a Danger Tag is hung on the 
handwheel.
    5. Establish and implement a procedure to ensure that no other 
maintenance will be performed on the condenser water box, unless 
permit-required confined space measures are used.
    6. Modify each of the 12 condenser water box isolation valves to 
drill four holes into the 99.75 inch diameter upper valve range, which 
will be plugged when the condenser water box is in service and 
fabricate 20 three-fourth inch diameter stop pins, which will be 
installed to block movement of the butterfly valve disk and hang Danger 
Tags on the pins.
    7. Confirm that lineup changes (i.e., pump switching, valve 
position changes) within the CWS are prohibited while personnel are 
within the water box.
    8. Limit the number of personnel occupying the isolated water box 
to no more than 3 in the inlet or outlet and no more than 4 persons in 
total during condenser water box maintenance activities.
    9. Utilize technology-based level measurement instruments with 
local audible alarms to alert the personnel working in the isolated 
water box of a rising water level in the CWS piping beneath the water 
box. This instrument serves as a secondary means of monitoring the 
water level, in addition to the manual level monitoring via Tygon 
tubing.
    10. Utilize hydraulic calculations to analyze the potential leak 
paths into an isolated water box and quantify the inflow rates and 
durations to fill the water box. This will identify how much time 
personnel have to evacuate the water box in the event of a water leak 
into the isolated water box.
    11. Utilize a physical lock on the 6 inch cross-tie valve (or 
replace the valve with a design that allows physical locking) to 
prevent any unauthorized operation of the valve during the condenser 
water box maintenance activity.
    12. Monitor the water levels in the supply side water box (and 
return water box) regardless of when personnel are present. Continuous 
monitoring for water leakage on the supply and return water boxes of an 
isolated segment of the system as water leakage from either side could 
present a hazard to personnel even if they are not in the water box 
where the leakage is occurring.
    13. Require the presence of a dedicated water box drain pump 
operator while personnel are occupying the isolated water box.
    14. Utilize the water box low-point drains (6 inches for Unit 1 and 
8 inches for Unit 2) to provide secondary means of evacuating water 
leakage from the isolated water box connected CWS piping.
    15. Install a level indicator that will alarm to alert the employee 
in the water box to evacuate because of rising water levels and auto 
start the two drain pumps. This level indicator alarm is in addition to 
the portable system being used in monitoring the levels.
    16. In addition to the watch stander attendant required under 29 
CFR 1910.146, the rescue team members must be present at the water box 
throughout duration of the maintenance activities.
Condition E: Communication
    This condition requires the applicant to implement an effective 
system of information sharing and communication to provide workers 
performing maintenance activities within condenser water boxes of any 
hazards that may affect their safety. Effective information sharing and 
communication are intended to ensure that affected workers receive 
updated information regarding any safety-related hazards and incidents, 
and corrective actions taken, prior to the start of each shift. This 
condition also requires the applicant to ensure reliable means of 
emergency communications are available and maintained for affected 
workers and support personnel during maintenance activities within the 
condenser water box. Availability of such reliable means of 
communications enables affected workers and support personnel to 
respond quickly and effectively to hazardous conditions or emergencies 
that may develop during water box maintenance operations.
Condition F: Worker Qualification and Training
    This condition requires STP Nuclear to implement an effective 
permit-required isolation qualification and training program for 
authorized employees who perform maintenance

[[Page 22463]]

activities within condenser water boxes. Additionally, Condition F 
requires the applicant to train each affected employee on the purpose 
and use of the permit-required confined space procedures.
    The condition specifies the factors that an affected worker must 
know how to perform safely during maintenance operations within the 
condenser water box, including how to enter, work in, and exit from a 
condenser water box under both normal and emergency conditions. Having 
well-trained and qualified workers performing condenser water box 
maintenance activities is intended to ensure that they can recognize 
and respond appropriately to electrical safety and health hazards. 
These qualification and training requirements enable affected workers 
to handle emergencies effectively, thereby preventing worker injury, 
illness, and fatalities. Additionally, Condition F requires the 
applicant to train each affected employee in the purpose and use of the 
alternative permit-required confined space isolation procedures 
identified in the permanent variance application.
Condition G: Inspections, Tests, and Accident Prevention
    This condition requires the applicant to implement and operate an 
effective program for completing inspections, tests, program 
evaluations, and accident prevention for performing maintenance and 
cleaning activities within the condenser water box and associated work 
areas. This condition will help to ensure the safe operation and 
physical integrity of the condenser water boxes and the work areas 
necessary to safely conduct maintenance operations.
    This condition also requires the applicant to conduct tests, 
inspections, corrective actions, and repairs involving the use of the 
alternative isolation process used to perform maintenance activities on 
condenser water boxes identified in the variance application. Further, 
this requirement provides the applicant with information needed to 
schedule tests and inspections to ensure the continued safe operation 
of the equipment and systems and to determine that the actions taken to 
correct defects are appropriate. These tests, inspections, corrective 
actions, and repairs shall be conducted in concert with the Condenser 
Water Box Online Isolate and Restoration Procedure submitted to OSHA by 
STP Nuclear with the Variance application.
Condition H: Additional Recordkeeping Requirement
    Under OSHA's recordkeeping requirements in 29 CFR part 1904 
Recording and Reporting Occupational Injuries and Illnesses, STP 
Nuclear must maintain a record of any recordable injury, illness, or 
fatality (as defined by 29 CFR part 1904) resulting from the task of 
cleaning and performing maintenance activities within the condenser 
water box by completing OSHA Form 301, Injury and Illness Incident 
Report and OSHA Form 300, Log of Work-Related Injuries and Illnesses. 
In addition, STP Nuclear must maintain records of all maintenance 
activities performed at condenser water boxes at the STP Nuclear site, 
as well as associated hazardous condition corrective actions and 
repairs.
Condition I: Notifications
    Under this condition, the applicant is required, within specified 
periods of time, to: (1) Notify OSHA of any recordable injury, illness, 
in-patient hospitalization, amputation, loss of an eye, or fatality 
that occurs as a result of cleaning or maintenance activities around 
the condenser water box; (2) provide OSHA a copy of the incident 
investigation report (using OSHA Form 301, Injury and Illness Incident 
Report) of these events within 24 hours of the incident; (3) include on 
OSHA Form 301, Injury and Illness Incident Report, information on the 
conditions associated with the recordable injury or illness, the root-
cause determination, and preventive and corrective actions identified 
and implemented; (4) provide the certification that affected workers 
were informed of the incident and the results of the incident 
investigation; (5) notify OSHA's Office of Technical Programs and 
Coordination Activities (OTPCA) and the Corpus Christi, Texas Area 
Office at least 15 working days in advance, should the applicant need 
to revise the permit-required confined space isolation procedures 
related to condenser water box cleaning or maintenance affecting STP 
Nuclear's ability to comply with the conditions of this permanent 
variance; and (6) provide OTPCA and the Corpus Christi, Texas Area 
Office, by January 31 of each calendar year, with a report covering the 
previous calendar year, evaluating the effectiveness of the alternate 
permit-required confined space isolation procedures set forth in the 
conditions of the permanent variance.
    Additionally, this condition requires the applicant to notify OSHA 
if it ceases to do business, has a new address or location for the main 
office, or transfers the operations covered by the permanent variance 
to a successor company. In addition, the condition specifies that the 
transfer of the permanent variance to a successor company must be 
approved by OSHA. These requirements allow OSHA to communicate 
effectively with the applicant regarding the status of the permanent 
variance, and expedite the agency's administration and enforcement of 
the permanent variance. Stipulating that an applicant is required to 
have OSHA's approval to transfer a variance to a successor company 
provides assurance that the successor company has knowledge of, and 
will comply with, the conditions specified by this permanent variance, 
thereby ensuring the safety of workers involved in performing the 
operations covered by the permanent variance.

IV. Decision

    As described earlier in this notice, after reviewing the proposed 
alternative, OSHA determined that STP Nuclear developed, and proposed 
to implement, effective alternative means of protection that protect 
its employees as effectively as paragraph 29 CFR 1910.146(d)(3)(iii) of 
OSHA's standard governing isolation of permit-controlled confined space 
during the task of maintenance of condenser water boxes. Further, under 
section 6(d) of the OSH Act (29 U.S.C. 655(d)), and based on the record 
discussed above, the agency finds that when the employer complies with 
the conditions of the variance, the working conditions of the 
employer's workers are at least as safe and healthful as if the 
employer complied with the working conditions specified by paragraph 29 
CFR 1910.146(d)(3)(iii) of OSHA's standard for isolation of permit-
controlled confined space. Therefore, under the terms of this variance, 
STP Nuclear must: (1) Comply with the conditions listed below under 
section V of this notice (``Order'') for the period between the 
effective date of this notice and until the agency modifies or revokes 
this final order in accordance with 29 CFR 1905.13; (2) comply fully 
with all other applicable provisions of 29 CFR part 1910; and (3) 
provide a copy of this Federal Register notice to all employees 
affected by the conditions using the same means it used to inform these 
employees of the application for a permanent variance.

V. Order

    As of the effective date of this final order, OSHA is revoking the 
Interim Order granted to the employer on September 1, 2020 (86 FR 
54424).

[[Page 22464]]

    OSHA issues this final order authorizing South Texas Project 
Nuclear Operating Company (STP Nuclear or the applicant) to comply with 
the following conditions instead of complying with the requirements of 
paragraphs 29 CFR 1910.146(d)(3)(iii) of OSHA's isolation requirements 
of permit-controlled confined space. This final order applies to all 
STP Nuclear employees located at 12090 FM 521, Wadsworth, Texas 77483. 
The standard defines ``isolation of permit space'' in 29 CFR 
1910.146(b) as: The process by which a permit-space is removed from 
service and isolated, and completely protected against the release of 
energy and material into the space by such means as: . . . Blocking or 
disconnecting all mechanical linkages. Further, 29 CFR 
1910.146(d)(3)(iii) requires isolation of the permit-required confined 
space.

A. Scope

    1. This permanent variance applies only to the task of performing 
maintenance activities within condenser water boxes at STP Nuclear's 
Wadsworth, Texas facility. This work is to be performed by authorized 
employees under the alternative isolation procedures submitted to OSHA 
as part of this application for a permanent variance.
    2. No other servicing and/or maintenance work, including electrical 
maintenance, may be performed at the STP Nuclear facility using the 
conditions of this order. These activities are to be performed in full 
compliance with all applicable provisions of 29 CFR 1910.146.
    3. No construction work (i.e., work for construction, alteration, 
and/or repair, including painting and decorating) may be performed 
within the condenser water boxes under the conditions of this order.
    4. Except for the requirements specified by 29 CFR 1910.146(b) and 
29 CFR 1910.146(d)(3)(iii), STP Nuclear must comply fully with all 
other applicable provisions of 29 CFR 1910.146 during maintenance 
activities of condenser water boxes.
    5. The interim order granted to STP Nuclear on September 1, 2020 
(86 FR 54424), is hereby revoked as of the effective date of this final 
order.

B. List of Abbreviations

    The following abbreviations apply to this permanent variance:

1. CFR--Code of Federal Regulations
2. CWS--Circulating Water System
3. ECO--Equipment Clearance Box
4. FMEA--Failure Modes and Effects Analysis
5. HAZOP--Hazard and Operability Study
6. MCR--Main Cooling Reservoir
7. OSHA--Occupational Safety and Health Administration
8. OTPCA--Office of Technical Programs and Coordination Activities
9. RRP--Rope Rescue Program
10. TGB--Turbine Generator Building

C. Definitions

    The following definitions apply to this permanent variance:
    1. Affected employee or worker--an employee or worker who is 
affected by the conditions of this permanent variance, or any one of 
his or her authorized representatives. The term ``employee'' has the 
meaning defined and used under the Occupational Safety and Health Act 
of 1970 (29 U.S.C. 651 et seq.).
    2. Competent person--an individual who is capable of identifying 
existing and predictable hazards in the surroundings or working 
conditions that are unsanitary, hazardous, or dangerous to employees, 
and who has authorization to take prompt corrective measures to 
eliminate them.
    3. Engulfment--the surrounding and effective capture of a person by 
a liquid or finely divided (flowable) solid substance that can be 
aspirated to cause death by filling or plugging the respiratory system 
or that can exert enough force on the body to cause death by 
strangulation, constriction, or crushing.
    4. Hazard and Operability Study--an evaluation of tasks or 
operations to identify potential hazards and to determine the necessary 
controls.
    5. Isolation--the process by which a permit space is removed from 
service and completely protected against the release of energy and 
material into the space by such means as: Blanking or blinding; 
misaligning or removing sections of lines, pipes, or ducts; a double 
block and bleed system; lockout or tagout of all sources of energy; or 
blocking or disconnecting all mechanical linkages.
    6. Permit-required confined space--a confined space that has one or 
more of the following characteristics:
    (1) Contains or has a potential to contain a hazardous atmosphere;
    (2) Contains a material that has the potential for engulfing an 
entrant;
    (3) Has an internal configuration such that an entrant could be 
trapped or asphyxiated by inwardly converging walls or by a floor which 
slopes downward and tapers to a smaller cross-section; or
    (4) Contains any other recognized serious safety or health hazard.
    7. Qualified person--an individual who, by possession of a 
recognized degree, certificate, or professional standing, or who, by 
extensive knowledge, training, and experience, successfully 
demonstrates an ability to solve or resolve problems relating to 
maintenance of condenser water boxes.

D. Safety Practices and Procedures

    1. STP Nuclear shall adhere to the Condenser Water Box Online 
Isolation and Restoration Procedure provided to OSHA with the Variance 
application while performing cleaning or maintenance activities within 
condenser water boxes, in accordance with STP Nuclear's permit-required 
confined space program.
    2. STP Nuclear shall implement the hazard prevention and control 
requirements identified in the Variance application (use of stop pins) 
to isolate condenser water boxes before performing maintenance 
activities within condenser water boxes.
    3. STP Nuclear shall close the cycle inlet and butterfly valves 
with a local handswitch.
    4. STP Nuclear shall remove power from the inlet and isolation 
valve and hang Danger Tags on the local handswitch and the breaker.
    5. STP Nuclear shall drain the condenser water box to another 
condenser water box using the permanently installed condenser drain 
down pumps.
    6. STP Nuclear shall check for leakages past the isolation valve 
seat. In the event that a leak is found, STP Nuclear will use a 
handwheel to manually achieve proper disk seating and ensure that a 
Danger Tag is hung on the handwheel.
    7. STP Nuclear shall establish and implement a procedure to ensure 
that no other maintenance will be performed on the condenser water box, 
unless permit-required confined space measures are used.
    8. STP Nuclear shall modify each of the 12 condenser water box 
isolation valves to drill four holes into the 99.75 inch diameter upper 
valve range, which will be plugged when the condenser water box is in 
service and fabricate 20 three-fourth inch diameter stop pins, which 
will be installed to block movement of the butterfly valve disk and 
hang Danger Tags on the pins.
    9. STP Nuclear shall confirm that lineup changes (i.e., pump 
switching, valve position changes) within the CWS are prohibited while 
personnel are within the water box.
    10. STP Nuclear shall limit the number of personnel occupying the 
isolated water box to no more than 3

[[Page 22465]]

people in the inlet or outlet and no more than 4 people in total during 
condenser water box maintenance activities.
    11. STP shall utilize technology-based level measurement 
instruments with local audible alarms to alert the personnel working in 
the isolated water box of a rising water level in the CWS piping 
beneath the water box. The instrument serves as a secondary means of 
monitoring the water level, in addition to the manual level monitoring 
via Tygon tubing.
    12. STP Nuclear shall utilize hydraulic calculations to analyze the 
potential leak paths into an isolated water box and quantify the inflow 
rates and durations to fill the water box. This will identify how much 
time personnel have to evacuate the water box in the event of a water 
leak into the isolated water box.
    13. STP Nuclear will utilize a physical lock on the 6 inch cross-
tie valve (or replace the valve with a design that allows physical 
locking) to prevent any unauthorized operation of the valve during the 
condenser water box maintenance activity.
    14. STP Nuclear shall monitor the water levels in the supply side 
water box (and return water box) regardless of when personnel are 
present. Continuous monitoring for water leakage on the supply and 
return water box of an isolated segment of the system is required as 
water leakage from either side could present a hazard to personnel even 
if they are no in the water box where the leakage is occurring.
    15. STP Nuclear shall require the presence of a dedicated water box 
drain pump operator while personnel are occupying the isolated water 
box.
    16. STP Nuclear shall utilize the water box low-point drains (6 
inch for Unit 1 and 8 inch for Unit 2) to provide secondary means of 
evacuating water leakage from the isolated water box connected CWS 
piping.
    17. STP Nuclear shall install a level indicator that will alarm to 
alert the employee in the water box to evacuate because of rising water 
levels and auto start the two drain pumps. This level indicator alarm 
is in addition to the portable system being used in monitoring the 
levels.
    18. STP Nuclear shall ensure that rescue team members be present at 
the condenser water box throughout the duration of the maintenance 
activities.

E. Communication

    STP Nuclear must:
    1. Implement a system that informs workers performing maintenance 
activities within condenser water boxes of any hazardous occurrences or 
conditions that might affect their safety.
    2. Provide a means of communication among affected workers and 
support personnel in energy isolation where unassisted voice 
communication is inadequate.
    (a) Use an independent power supply for powered communication 
systems, and these systems must operate such that use or disruption of 
any one phone or signal location will not disrupt the operation of the 
system from any other location.
    (b) Test communication systems at the start of each shift and as 
necessary thereafter to ensure proper operation.

F. Worker Qualifications and Training

    STP Nuclear will implement an effective permit-required confined 
space isolation qualification and training program for authorized 
employees involved in performing maintenance activities within 
condenser water boxes. All training must be provided in a language that 
the employees can understand. STP Nuclear must:
    1. Utilize the permit-required confined space isolation training 
program submitted to OSHA as part of this Variance application, and 
train each authorized employee on the isolation process for condenser 
water boxes, and the procedures required under it;
    2. Develop a training program and train each affected employee in 
the purpose and use of the alternative permit-required confined space 
isolation procedures used for maintenance of condenser water boxes 
under this interim order and document this instruction;
    3. Ensure that workers performing maintenance activities within 
condenser water boxes know how to enter, work in, and exit from a 
condenser water box under both normal and emergency conditions;
    4. Ensure that each authorized and affected employee has effective 
and documented training in the contents and conditions covered by this 
permanent variance and interim order; and
    5. Ensure that only trained and authorized employees perform 
permit-required confined space isolation procedures for the task of 
performing maintenance of condenser water boxes at the STP Nuclear 
site.

G. Inspections, Tests, and Accident Prevention

    STP Nuclear must implement the detailed program for completing 
inspections, tests, program evaluations, and incident prevention for 
the isolation of condenser water boxes for maintenance purposes in 
accordance with its permit-required confined space procedure submitted 
to OSHA as part of STP Nuclear's Variance application. STP Nuclear 
must:
    1. Ensure that a competent person (authorized employee) conducts 
daily visual checks and monthly inspections and functionality tests of 
condenser water boxes and permit-required confined space isolation 
procedures that ensure the procedure and conditions of this permanent 
variance and interim order are being followed.
    2. Ensure that a competent person conducts daily inspections of the 
work areas associated with the maintenance of the condenser water 
boxes.
    3. Develop a set of checklists to be used by a competent person in 
conducting daily inspections of the condenser water boxes and permit-
required confined space procedures used while performing maintenance 
activities at condenser water boxes at the STP Nuclear facility.
    4. STP Nuclear will remove from service any equipment that 
constitutes a safety hazard until STP Nuclear corrects the hazardous 
condition and has a qualified person approve the correction.
    5. STP will maintain records of all maintenance activities of the 
condenser water box, as well as associated corrective actions and 
repairs, at the job site for the duration of the variance. Where 
available, the maintenance, servicing, and installation of replacement 
parts must strictly follow the manufacturer's specifications, 
instructions, and limitations.

H. Additional Recordkeeping Requirement

    STP Nuclear must maintain a record of any recordable injury, 
illness, or fatality (as defined by 29 CFR 1904) resulting from the 
task of cleaning and performing maintenance activities within the 
condenser water box by completing OSHA Form 301, Injury and Illness 
Incident Report, and OSHA Form 300, Log of Work-Related Injuries and 
Illnesses. In addition, STP Nuclear must maintain records of all 
maintenance activities performed at condenser water boxes at the STP 
Nuclear site, as well as associated hazardous condition corrective 
actions and repairs.

I. Notifications

    To assist OSHA in administering the conditions specified herein, 
STP Nuclear must:
    1. Notify OSHA's Office of Technical Programs and Coordination 
Activities (OTPCA) and the Corpus Christi, Texas Area Office of any 
recordable injury, illness, in-patient hospitalization,

[[Page 22466]]

amputation, loss of an eye, or fatality (by submitting the completed 
OSHA Form 301, Injury and Illness Incident Report) resulting from 
implementing the alternative isolation procedures of this permanent 
variance conditions while completing the tasks of cleaning and/or 
maintenance of the condenser water box, in accordance with 29 CFR 1904. 
STP Nuclear shall provide the notification within 8 hours of the 
incident or 8 hours after becoming aware of a recordable injury, 
illness, or fatality; and a copy of the incident investigation (OSHA 
Form 301, Injury and Illness Incident Report) must be submitted to OSHA 
within 24 hours of the incident or 24 hours after becoming aware of a 
recordable injury, illness, or fatality.
    2. Provide OTPCA and the Corpus Christi, Texas Area Office a copy 
of the incident investigation report (using OSHA Form 301, Injury and 
Illness Incident Report) of these events within 24 hours of the 
incident;
    3. Include on the OSHA Form 301, Injury and Illness Incident 
Report, information on the conditions associated with the recordable 
injury or illness, the root-cause determination, and the preventive and 
corrective actions identified and implemented.
    4. Provide certification to OTPCA and the Corpus Christi, Texas 
Area Office within 15 working days of any engulfment incident that STP 
Nuclear has informed affected workers of the incident and the results 
of the incident investigation (including the root-cause determination 
and preventive and corrective actions identified and implemented).
    5. Notify OTPCA and the Corpus Christi, Texas Area Office at least 
15 working days in advance, should STP Nuclear need to revise the 
permit-required confined space isolation procedures related to 
condenser water box cleaning or maintenance affecting its ability to 
comply with the conditions of this permanent variance.
    6. Provide OTPCA and the Corpus Christi, Texas Area Office, by 
January 31 of each calendar year, with a report covering the previous 
calendar year, identifying the maintenance activities performed on the 
condenser water boxes and evaluating the effectiveness of the alternate 
permit-required confined space isolation procedures set forth in the 
conditions of the permanent variance.
    7. Inform OTPCA and the Corpus Christi, Texas Area Office as soon 
as possible, but no later than 7 days, after it has knowledge that it 
will:
    (i) Cease doing business; or
    (ii) Transfer the operations specified herein to a successor 
company.
    6. Notify all affected employees of this permanent variance by the 
same means required to inform them of the application for a variance.
Authority and Signature
    James S. Frederick, Acting Assistant Secretary of Labor for 
Occupational Safety and Health, Washington, DC 20210, authorized the 
preparation of this notice. Accordingly, the agency is issuing this 
notice pursuant to 29 U.S.C. 657(g)(2)), Secretary of Labor's Order No. 
8-2020 (85 FR 58393, Sept. 18, 2020), and 29 CFR 1910.7.

    Signed at Washington, DC, on April 22, 2021.
James S. Frederick,
Acting Assistant Secretary of Labor for Occupational Safety and Health.
[FR Doc. 2021-08812 Filed 4-27-21; 8:45 am]
BILLING CODE 4510-26-P