ML24306A039
| ML24306A039 | |
| Person / Time | |
|---|---|
| Issue date: | 11/01/2024 |
| From: | Mohammad Sadollah NRC/RES/DE/DICB |
| To: | |
| References | |
| RG 1.41 Rev. 0 | |
| Download: ML24306A039 (2) | |
Text
Basis for Withdrawal of a Regulatory Guide 1
Regulatory Guide Number:
1.41, Revision 0
Title:
Preoperational Testing of Redundant On-Site Electric Power Systems to Verify Proper Load Group Assignments Office/Division/Branch:
NRR/RES/ICEEB Technical Lead:
SUBJECT:
Basis for Withdrawal and Incorporation into RG 1.32, Revision 4 (1)
What regulation(s) did the regulatory guide support?
The U.S. Nuclear Regulatory Commission (NRC) issued Regulatory Guide (RG) 1.41, Preoperational Testing of Redundant On-Site Electric Power Systems to Verify Proper Load Group Assignments, in 1973 to provide guidance on meeting the requirements of General Design Criterion 1, Quality standards and records, of Appendix A, General Design Criteria for Nuclear Power Plants, to Title 10 of the Code of Federal Regulations (10 CFR) Part 50, Domestic Licensing of Production and Utilization Facilities, for testing structures, systems, and components important to safety and quality standards commensurate with the importance of the safety functions to be performed. Criterion Xl, Test Control, of Appendix B, Quality Assurance Criteria for Nuclear Power Plants and Fuel Reprocessing Plants, to 10 CFR Part 50 requires that a test program be established to ensure that all testing required to demonstrate that structures, systems, and components will perform satisfactorily in service is identified and performed. For onsite emergency power systems designed in accordance with RG 1.6, Independence Between Redundant Standby (Onsite) Power Sources and Between Their Distribution Systems (Safety Guide 6), and RG 1.32, Criteria for Power Systems for Nuclear Power Plants (Safety Guide 32), this guide describes an acceptable method of complying with the Commissions regulations with respect to verifying the proper assignments of redundant load groups to the related onsite power sources.
(2)
What was the purpose of the regulatory guide?
RG 1.41 provided regulatory acceptance criteria and acceptable assumptions and evaluation models for preoperational testing of onsite electric power systems redundancy and proper load group assignment.
(3)
How was the regulatory guide used in regulatory activities, particularly licensing reviews and inspections?
Licensees and applicants followed the guidance for planning and performing preoperational testing, or testing after a major modification, to demonstrate compliance with applicable regulations regarding onsite electric power systems redundancy and proper load group assignment. The NRC staff used this guidance to review applications or other relevant submissions by applicants and licensees, as well as to verify compliance with applicable regulations during inspections.
Basis for Withdrawal of a Regulatory Guide 2
(4)
Is the regulatory guide referenced in other technical or regulatory documents?
What are the ripple effects on these documents if it is withdrawn?
NUREG-0800, Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition, Chapter 8, Electric Power, discusses onsite power systems, redundancy requirements, and electric load groups design and testing.
However, it makes no direct reference to RG 1.41. A search of other RGs and inspection procedures did not reveal any references to RG 1.41. Inspection Manual Chapter 1245, Appendix D4, Electrical Advanced Level Training and Qualification Journal, mentions RG 1.41 regarding preoperational testing. Withdrawal of RG 1.41 and incorporation into RG 1.32, Revision 4, will not have any ripple effects in any relevant document.
(5)
Why is the regulatory guide no longer needed (e.g., what is the rationale for withdrawing this regulatory guide instead of revising it)?
The contents and provisions of RG 1.41 remain valid and relevant to meeting requirements for preoperational testing of onsite electric power systems. These provisions will be consolidated and incorporated into RG 1.32, Revision 4, which covers criteria for these onsite electric power systems. This relocation is deemed prudent, as it maintains the provisions of RG 1.41, offers more visibility for its contents, and facilitates efficiency and paperwork reduction through this consolidation.
(6)
What guidance is available once the regulatory guide is withdrawn?
Once RG 1.41 is withdrawn, RG 1.32, Revision 4, shall continue to provide guidance for acceptable methods of meeting requirements for preoperational testing of onsite electric power systems.
(7)
Is this Regulatory Guide included in any of the licensing basis documents? If yes, what would be the implications? (Consider performing a backfit analysis, per MD 8.4.)
The contents and intent of RG 1.41 are not changing, nor are they being modified. RG.1.32, Revision 4, shall continue to provide the same acceptable methods of meeting requirements for preoperational testing of onsite electric power systems.
Therefore, there should be no impact on existing licensing bases and this withdrawal does not present a backfit concern.
(8)
Do other agencies rely upon the regulatory guide (e.g., the Agreement States, National Aeronautical and Space Administration, U.S. Department of Energy)?
The NRC staff is unaware of any other agency that uses or relies upon the guidance included in RG 1.41.