This section of the FEDERAL REGISTER

contains regulatory documents having general

applicability and legal effect, most of which

are keyed to and codified in the Code of

Federal Regulations, which is published under

50 titles pursuant to 44 U.S.C. 1510.

The Code of Federal Regulations is sold by

the Superintendent of Documents.

Rules and Regulations Federal Register

8655 

Vol. 90, No. 20 

Friday, January 31, 2025 

NUCLEAR REGULATORY 

COMMISSION 

10 CFR Parts 50 and 52 

[NRC–2024–0140] 

Regulatory Guides: Criteria for Power 

Systems for Nuclear Power Plants and 

Criteria for the Protection of Class 1E 

Power Systems and Equipment for 

Nuclear Power Plants 

AGENCY: Nuclear Regulatory 

Commission. 

ACTION: Final guide; issuance. 

SUMMARY: The U.S. Nuclear Regulatory 

Commission (NRC) is issuing Revision 4 

to Regulatory Guide (RG) 1.32, ‘‘Criteria 

for Power Systems for Nuclear Power 

Plants,’’ and new RG 1.238, ‘‘Criteria for 

the Protection of Class 1E Power 

Systems and Equipment for Nuclear 

Power Plants.’’ RG 1.32, Revision 4, 

describes an acceptable approach for 

use in complying with NRC regulations 

for the design, operation, and testing of 

electric power systems in nuclear power 

plants. RG 1.238 describes an acceptable 

approach for use in complying with 

NRC regulations for protection of Class 

1E power systems and equipment at 

nuclear power plants. The NRC is also 

withdrawing RG 1.41, ‘‘Preoperational 

Testing of Redundant On-Site Electric 

Power Systems to Verify Proper Load 

Group Assignments,’’ since its guidance 

is incorporated into RG 1.32, Revision 4. 

DATES: Revision 4 to RG 1.32 and 

Revision 0 to RG 1.238 are available on 

January 31, 2025. 

ADDRESSES: Please refer to Docket ID 

NRC–2024–0140 when contacting the 

NRC about the availability of 

information regarding this document. 

You may obtain publicly available 

information related to this document 

using any of the following methods: 

• Federal Rulemaking Website: Go to 

https://www.regulations.gov and search 

for Docket ID NRC–2024–0140. Address 

questions about Docket IDs in 

Regulations.gov to Stacy Schumann; 

telephone: 301–415–0624; email: 

Stacy.Schumann@nrc.gov. For technical 

questions, contact the individuals listed 

in the FOR FURTHER INFORMATION

CONTACT section of this document. 

• NRC’s Agencywide Documents 

Access and Management System 

(ADAMS): You may obtain publicly 

available documents online in the 

ADAMS Public Documents collection at 

https://www.nrc.gov/reading-rm/ 

adams.html. To begin the search, select 

‘‘Begin Web-based ADAMS Search.’’ For 

problems with ADAMS, please contact 

the NRC’s Public Document Room (PDR) 

reference staff at 1–800–397–4209, at 

301–415–4737, or by email to 

PDR.Resource@nrc.gov. The ADAMS 

accession number for each document 

referenced (if it is available in ADAMS) 

is provided the first time that it is 

mentioned in this document. 

• NRC’s PDR: The PDR, where you 

may examine and order copies of 

publicly available documents, is open 

by appointment. To make an 

appointment to visit the PDR, please 

send an email to PDR.Resource@nrc.gov 

or call 1–800–397–4209 or 301–415– 

4737, between 8 a.m. and 4 p.m. eastern 

time (ET), Monday through Friday, 

except Federal holidays. 

Revision 4 to RG 1.32 and the 

regulatory analysis may be found in 

ADAMS under Accession Nos. 

ML24306A036 and ML24158A062; and 

RG 1.238 and its regulatory analysis 

may be found in ADAMS under 

ML24306A049 and ML24158A042, 

respectively. The basis for withdrawal 

of RG 1.41 may be found in ADAMS 

under Accession No. ML24306A039. 

Regulatory guides are not 

copyrighted, and NRC approval is not 

required to reproduce them. 

FOR FURTHER INFORMATION CONTACT: 

Michael Eudy, Office of Nuclear 

Regulatory Research, telephone: 301– 

415–3104; email: Michael.Eudy@

nrc.gov, Mohammad Sadollah, Office of 

Nuclear Regulatory Research, telephone: 

301–415–6804; email: 

Mohammad.Sadollah@nrc.gov, and 

Sheila Ray, Office of Nuclear Reactor 

Regulation, telephone 301–415–3653; 

email: Sheila.Ray@nrc.gov. All are staff 

of the U.S. Nuclear Regulatory 

Commission, Washington, DC 20555– 

0001. 

SUPPLEMENTARY INFORMATION: 

I. Discussion 

The NRC is issuing a revision and a 

new RG in the NRC’s ‘‘Regulatory 

Guide’’ series. This series was 

developed to describe methods that are 

acceptable to the NRC staff for 

implementing specific parts of the 

agency’s regulations, to explain 

techniques that the staff use in 

evaluating specific issues or postulated 

events, and to describe information that 

the staff needs in its review of 

applications for permits and licenses. 

The proposed Revision 4 to RG 1.32 

was issued with a temporary 

identification of Draft Regulatory Guide 

(DG), DG–1420; and the proposed new 

RG 1.238 was issued with a temporary 

identification of DG–1354. 

II. Additional Information 

The NRC published a notice of the 

availability of DG–1420 and DG–1354 in 

the Federal Register on August 28, 2024 

(89 FR 68787), for a 30-day public 

comment period. The public comment 

period closed on September 27, 2024. 

Public comments and the NRC staff’s 

responses to the public comments on 

DG–1420 and DG–1354 are available in 

ADAMS under Accession No. 

ML24306A053. 

RG 1.32, Revision 4, describes an 

approach that is acceptable to the NRC 

staff to meet regulatory requirements for 

the design, operation, and testing of 

electric power systems in nuclear power 

plants. Subject to the conditions 

described in Section C of the RG, it 

endorses the Institute of Electrical and 

Electronics Engineers (IEEE) Standard 

(Std.) 308–2020, ‘‘IEEE Standard Criteria 

for Class 1E Power Systems for Nuclear 

Power Generating Stations.’’ In addition, 

RG 1.32, Revision 4 includes the 

guidance provisions of RG 1.41, 

‘‘Preoperational Testing of Redundant 

On-Site Electric Power Systems to 

Verify Proper Load Group 

Assignments,’’ which describes methods 

acceptable to the NRC staff for 

independence among redundant, onsite 

power sources and their load groups as 

part of the initial preoperational testing 

program and after major modifications 

or repairs. The staff is withdrawing RG 

1.41 because its guidance has been 

incorporated into RG 1.32, Revision 4. 

RG 1.238 describes an approach that 

is acceptable to the NRC staff for use in 

complying with NRC regulations that 

addresses the protection of Class 1E 


ddrumheller on DSK120RN23PROD with RULES1
8656 Federal Register / Vol. 90, No. 20 / Friday, January 31, 2025 / Rules and Regulations 

power systems and equipment at 

nuclear power plants. Subject to the 

conditions described in Section C of the 

RG, it endorses, IEEE Std. 741–2022, 

‘‘IEEE Standard for Criteria for the 

Protection of Class 1E Power Systems 

and Equipment for Nuclear Power 

Generating Stations.’’ 

As noted in the Federal Register on 

December 9, 2022 (87 FR 75671), this 

document is being published in the 

‘‘Rules’’ section of the Federal Register 

to comply with publication 

requirements under chapter I of title 1 

of the Code of Federal Regulations 

(CFR). 

III. Congressional Review Act 

This RG is a rule as defined in the 

Congressional Review Act (5 U.S.C. 

801–808). However, the Office of 

Management and Budget has not found 

it to be a major rule as defined in the 

Congressional Review Act. 

IV. Backfitting, Forward Fitting, and 

Issue Finality 

The issuance of Revision 4 to RG 1.32 

and RG 1.238 do not constitute 

backfitting as defined in 10 CFR 50.109, 

‘‘Backfitting,’’ and as described in NRC 

Management Directive (MD) 8.4, 

‘‘Management of Backfitting, Forward 

Fitting, Issue Finality, and Information 

Requests’’; affect issue finality of any 

approval issued under 10 CFR part 52, 

‘‘Licenses, Certificates, and Approvals 

for Nuclear Power Plants’’; or constitute 

forward fitting as defined in MD 8.4, 

because, as explained in these RGs, 

licensees would not be required to 

comply with the positions set forth in 

these RGs. 

V. Submitting Suggestions for 

Improvement of Regulatory Guides 

A member of the public may, at any 

time, submit suggestions to the NRC for 

improvement of existing RGs or for the 

development of new RGs. Suggestions 

can be submitted on the NRC’s public 

website at https://www.nrc.gov/readingrm/doc-collections/reg-guides/ 

contactus.html. Suggestions will be 

considered in future updates and 

enhancements to the ‘‘Regulatory 

Guide’’ series. 

Dated: January 28, 2025. 

For the Nuclear Regulatory Commission. 

Meraj Rahimi, 

Chief, Regulatory Guide and Programs 

Management Branch, Division of Engineering, 

Office of Nuclear Regulatory Research. 

[FR Doc. 2025–02065 Filed 1–30–25; 8:45 am] 

BILLING CODE 7590–01–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2024–2332; Project 

Identifier MCAI–2022–01479–R; Amendment 

39–22950; AD 2025–03–02] 

RIN 2120–AA64 

Airworthiness Directives; Airbus 

Helicopters 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) certain 

Airbus Helicopters Model AS332C, 

AS332C1, AS332L, AS332L1, AS332L2, 

AS355E, AS355F, AS355F1, AS355F2, 

AS355N, AS355NP, AS–365N2, AS 365 

N3, EC 155B, EC155B1, EC225LP, SA– 

365N, and SA–365N1 helicopters. This 

AD was prompted by a report of an 

unintentional activation of the hoist 

shear-button (shear-button) on the 

collective pitch handle during a night 

flight. This AD requires checking the 

operation of the shear-button safety-cap 

on each applicable collective pitch 

handle and prohibits installing certain 

part-numbered collective pitch handles 

or collective sticks with those partnumbered collective pitch handles 

installed unless certain requirements are 

met. The FAA is issuing this AD to 

address the unsafe condition on these 

products. 

DATES: This AD is effective March 7, 

2025. 

ADDRESSES: AD Docket: You may 

examine the AD docket at 

regulations.gov under Docket No. FAA– 

2024–2332; or in person at Docket 

Operations between 9 a.m. and 5 p.m., 

Monday through Friday, except Federal 

holidays. The AD docket contains this 

final rule, the mandatory continuing 

airworthiness information (MCAI), any 

comments received, and other 

information. The address for Docket 

Operations is U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE, 

Washington, DC 20590. 

FOR FURTHER INFORMATION CONTACT: Dan 

McCully, Aviation Safety Engineer, 

FAA, 1600 Stewart Avenue, Suite 410, 

Westbury, NY 11590; phone: (404) 474– 

5548; email: william.mccully@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 by adding an AD that would 

apply to Airbus Helicopters AS332C, 

AS332C1, AS332L, AS332L1, AS332L2, 

AS355E, AS355F, AS355F1, AS355F2, 

AS355N, AS355NP, AS–365N2, AS 365 

N3, EC 155B, EC155B1, EC225LP, SA– 

365N, and SA–365N1 helicopters, with 

a collective pitch handle installed on a 

pilot or co-pilot collective stick having 

part number 704A41–1100–42, 704A41– 

1100–50, 704A41–1100–56, 704A41– 

1100–57, 704A41–1100–60, 704A41– 

1100–67, 704A41–1100–68, 704A41– 

1100–97, 704A41–1100–98, 704A41– 

1100–99, 704A41–1101–14, 704A41– 

1101–30, or 704A41–1101–32, as 

applicable to the model helicopter. The 

NPRM published in the Federal 

Register on October 16, 2024 (89 FR 

83437). The NPRM was prompted by 

European Union Aviation Safety Agency 

(EASA) AD 2022–0220, dated November 

16, 2022 (EASA AD 2022–0220) (also 

referred to as the MCAI), issued by 

EASA, which is the Technical Agent for 

the Member States of the European 

Union. The MCAI advises of a report of 

an inadvertent activation of the shearbutton on a collective pitch handle 

occurring during a night flight when the 

pilot was turning on the headlight 

adjacent to the shear-button, which is 

protected by a safety-cap that is fitted 

with a spring. Additionally, the MCAI 

states that further investigation 

determined aging of the spring may 

have led to improper functioning of the 

safety-cap. 

In the NPRM, the FAA proposed to 

require checking the spring of the 

collective pitch handle for correct 

positioning of the shear-button safetycap and, depending on the results, 

replacing the spring or deferring 

replacement of the spring and installing 

a placard and prohibiting night flying 

during the deferment. The owner/ 

operator (pilot) holding at least a private 

pilot certificate may perform this check 

and must enter compliance with the 

applicable paragraphs of this AD into 

the helicopter maintenance records in 

accordance with 14 CFR 43.9(a) and 

91.417(a)(2)(v). The pilot may perform 

this check because it only involves 

lifting the safety-cap and verifying 

whether it automatically returns to an 

intended position. This check could be 

performed equally well by a pilot or a 

mechanic. This is an exception to the 

FAA’s standard maintenance 

regulations. 

In the NPRM, the FAA also proposed 

to prohibit installing certain partnumbered collective pitch handles or 

collective sticks with those partnumbered collective pitch handles 

installed unless the operational check 

and, as applicable, corrective action, is 


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