**SAFETY BASIS (SB)**

**OBJECTIVE**

**SB.1** Facility safety documentation is in place and has been
implemented that describes the "safety envelope" of the facility. The
safety documentation should characterize the hazards/risks associated
with the facility and should identify preventive and mitigating measures
(systems, procedures, administrative controls, etc.) that protect
workers and the public form those hazards/risks. Safety structures,
systems and components (SSCs) are defined and a system to maintain
control over their designs and modification is established. ***(Core
Requirement 7)***

**Criteria**

1\. The TA-55 SST Facility safety basis and related documentation
address the full spectrum of hazards/risks associated with operations.

2\. Controls designed to mitigate the consequence of analyzed TA-55 SST
Facility hazards, both safety SSCs and Specific Administrative Controls
are clearly defined and detailed in safety basis documentation.

3\. Installed safety SSCs are as described in the safety basis.

**Approach**

**Record Reviews:** Review safety basis documentation to verify that the
safety basis adequately addresses hazards and risks associated with
TA-55 SST Facility operations. Verify that safety SSCs are consistent
with their descriptions and performance assumed in the Interim Safety
Basis (ISB) and pertinent support documents. Examine the LASO Safety
Evaluation Report (SER), its Conditions of Approval, and applicable LASO
technical direction to ensure that required actions are addressed.

**Performance Demonstration:** Visit the TA-55 SST Facility to validate
that the ISB accurately describes the hazards that are present. Validate
by inspection that the installed safety SSCs are as described in the ISB
and pertinent support documents, except as may be documented and
evaluated in accordance with the Unreviewed Safety Question (USQ)
process.

**Personnel Interviews:** Interview TA-55 operations personnel to
validate their understanding of the safety basis and controls
established for TA-55 SST Facility operation.

**OBJECTIVE**

**SB.2** A program is in place to confirm and periodically reconfirm the
condition and operability of safety SSCs. This includes examinations of
records of tests and calibration of these systems. The material
condition of all safety, process, and utility systems will support safe
conduct of work. ***(Core Requirement 8)***

**Criteria**

1\. Documented evidence exists to ensure that constructed/installed
safety SSCs have been

inspected/tested, as appropriate, to ensure they comply with applicable
design requirements as specified in the ISB.

2\. Inspection procedures for in-service inspection requirements for
safety SSCs (design

features) have been established to ensure the conditions of the safety
SSCs continue to allow them to perform their safety functions consistent
with the approved safety basis.

*Note: The safety basis for the TA-55 SST Facility does not include any
active safety SSCs with operability requirements.*

**Approach**

**Record Reviews:** Review facility documentation to verify that
requisite inspection and test activities have been properly executed and
recorded.

Verify that designated inspections/tests are consistent with safety
basis requirements.

**Personnel Interviews:** Interview facility personnel responsible for
performing In-Service Inspections to validate they understand the breath
of their responsibilities and demonstrate the ability to execute

them.

**OBJECTIVE**

**SB.3** The facility systems and procedures, as affected by facility
modifications, are consistent with the

description of the facility, procedures, and accident analysis included
in the safety basis. ***(Core Requirement 9)***

**Criteria**

1\. Administrative controls are in place to ensure that modifications to
safety SSCs and

procedures are adequately analyzed to identify and to ensure that design
and operations

changes are documented and approved prior to implementation.

2\. Documented evidence exists to support that TA-55 SST modifications,
if any, made in

support of facility activities since approval of the current safety
basis have been reviewed

through the Applicability Screen for the Unreviewed Safety Question
process.

3\. Facility programs which support operation of the TA-55 SST,
including operational

procedures, work instructions and personnel training are upgraded and
maintained consistent with approved modifications to safety SSCs and
associated operating procedures.

**Approach**

Record Review: Review engineering and work control documentation to
verify that an effective configuration control process is established
and that there are no uncontrolled modifications to safety SSCs. Verify
that requirements are established to appropriately screen modifications
to safety SSCs as required by the LANL USQ program.

Personnel Interviews: Interview facility personnel responsible for
configuration management activities to validate their understanding of
program requirements and responsibilities in regard to the TA-55 SST
Facility safety basis.

**OBJECTIVE**

**SB.4** Formal agreements between the LANL contractor and NNSA have
been established via the contract or other enforceable mechanism to
govern the safe operations of the facility. These requirements have been
implemented in the facility, or compensatory measures are in place and
formally agreed to during the period of implementation. The compensatory
measures and the implementation period are approved by NNSA. ***(Core
Requirement 14)***

Criteria

1\. The facility Safety Basis, Authorization Agreement (or equivalent),
and pertinent

regulatory documentation appropriately authorize conduct of TA-55 SST
Facility

operations, and identify any compensatory measures required prior to or
during

operational activities.

2\. Safety Basis controls have been appropriately translated into
implementing documents

and these controls are adequately implemented in the facility.

3\. Surveillance procedures have been established to verify that
administrative controls will be implemented as specified in the safety
basis.

**Approach**

**Record Reviews:** Review safety basis documentation including the
TA-55 SST Facility ISB andAuthorization Agreement to confirm that
appropriate approvals have been obtained from LASO.

**Review** the facility Safety Basis Implementation Plan and relevant
facility procedures, operations orders and work instructions to confirm
that upper tier safety basis controls are appropriately reflected in
work control documents.

**Review** facility self assessments, Technical Safety Requirements
(TSR) and other confirmatory documentation to verify that specified
controls are adequately implemented **Review** implementing procedures
for specific administrative controls and required surveillances to
verify they specify proper instructions for executing the administrative
controls and required surveillances in accordance with the safety basis.

**Performance Demonstration:** Visit the TA-55 SST Facility and validate
that physical aids necessary to implement specific administrative
controls (e.g., speed limit signs) are installed.

**Personnel Interviews:** Interview operations personnel assigned to
perform surveillances and execute specific administrative controls to
verify they understand the breath of their

responsibilities and demonstrate the ability to execute them.