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Regulatory Information
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2010-09-23
article
Proposed Generic Communication; Clarification of Post-Fire Safe-Shutdown Circuit Regulatory Requirements
Notices
D09002ee1bde3c6bf
D09002ee1bde3c73a
United States
Nuclear Regulatory Commission
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org
United States Government Agency or Subagency
The U.S. Nuclear Regulatory Commission (NRC) is proposing to issue a regulatory information summary (RIS) to clarify regulatory requirement issues associated with post-fire safe-shutdown circuit analyses and protection, particularly the requirements of Title 10 of the Code of Federal Regulations, Part 50 (10 CFR 50), Appendix R, which have been interpreted by licensees in a manner that is not consistent with regulatory expectations. The industry and NRC regional inspectors have requested clarification of regulatory expectations with respect to post-fire safe-shutdown circuits. In addition, clarification of these requirements will assist licensees in evaluating the transition to a risk-informed, performance-based fire protection program. Three terms are to be addressed in this RIS: ``any-and-all'' (with respect to spurious actuations), ``associated circuits,'' and ``emergency control station.'' Clarification of the term ``one-at-a- time'' (with respect to spurious actuations) will be provided in a separate generic communication. For each term addressed, this RIS identifies the applicable NRC regulatory requirement, provides the regulatory expectation with respect to the requirement, and specifies one acceptable approach to achieving regulatory compliance. Attachment 1 to this RIS provides additional discussion that explains the basis for the regulatory expectations, including a discussion of the various ways in which each term or phrase has been interpreted by stakeholders. This RIS also gives the staff's views on the use of Nuclear Energy Institute (NEI) guidance document NEI 00-01, ``Guidance for Post-Fire Safe Shutdown Circuit Analysis,'' Revision 1 (ML050310295), in complying with Appendix R. The deterministic methodology presented in NEI 00-01, in conjunction with the guidance in this RIS, is one acceptable approach to achieving regulatory compliance with post-fire safe-shutdown circuit protection requirements. Note that RIS 2004-03, Revision 1, ``Risk-Informed Approach for Post-Fire Safe-Shutdown Circuit Inspections'' (ML042440791) provides guidance on conducting risk-informed circuit inspections, whereas this RIS clarifies the regulatory requirements for compliance with Appendix R. This Federal Register notice is available through the NRC's Agencywide Documents Access and Management System (ADAMS) under accession number ML051110160.
70 FR 25622
https://www.govinfo.gov/app/details/FR-2005-05-13/E5-2377
E5-2377
fr13my05-94
7590-01-P
https://www.govinfo.gov/app/details/FR-2005-05-13/E5-2377
https://www.govinfo.gov/content/pkg/FR-2005-05-13/html/E5-2377.htm
https://www.govinfo.gov/content/pkg/FR-2005-05-13/pdf/E5-2377.pdf
7 p.
25622
25628
70 FR 25622
Proposed Generic Communication; Clarification of Post-Fire Safe-Shutdown Circuit Regulatory Requirements; Federal Register Vol. 70, Issue
NOTICE
E5-2377
NUCLEAR REGULATORY COMMISSION
2005-07-12
7590-01-P
E5-2377
Notice of opportunity for public comment.
The U.S. Nuclear Regulatory Commission (NRC) is proposing to issue a regulatory information summary (RIS) to clarify regulatory requirement issues associated with post-fire safe-shutdown circuit analyses and protection, particularly the requirements of Title 10 of the Code of Federal Regulations, Part 50 (10 CFR 50), Appendix R, which have been interpreted by licensees in a manner that is not consistent with regulatory expectations. The industry and NRC regional inspectors have requested clarification of regulatory expectations with respect to post-fire safe-shutdown circuits. In addition, clarification of these requirements will assist licensees in evaluating the transition to a risk-informed, performance-based fire protection program. Three terms are to be addressed in this RIS: ``any-and-all'' (with respect to spurious actuations), ``associated circuits,'' and ``emergency control station.'' Clarification of the term ``one-at-a- time'' (with respect to spurious actuations) will be provided in a separate generic communication. For each term addressed, this RIS identifies the applicable NRC regulatory requirement, provides the regulatory expectation with respect to the requirement, and specifies one acceptable approach to achieving regulatory compliance. Attachment 1 to this RIS provides additional discussion that explains the basis for the regulatory expectations, including a discussion of the various ways in which each term or phrase has been interpreted by stakeholders. This RIS also gives the staff's views on the use of Nuclear Energy Institute (NEI) guidance document NEI 00-01, ``Guidance for Post-Fire Safe Shutdown Circuit Analysis,'' Revision 1 (ML050310295), in complying with Appendix R. The deterministic methodology presented in NEI 00-01, in conjunction with the guidance in this RIS, is one acceptable approach to achieving regulatory compliance with post-fire safe-shutdown circuit protection requirements. Note that RIS 2004-03, Revision 1, ``Risk-Informed Approach for Post-Fire Safe-Shutdown Circuit Inspections'' (ML042440791) provides guidance on conducting risk-informed circuit inspections, whereas this RIS clarifies the regulatory requirements for compliance with Appendix R. This Federal Register notice is available through the NRC's Agencywide Documents Access and Management System (ADAMS) under accession number ML051110160.
Comment period expires July 12, 2005. Comments submitted after this date will be considered if it is practical to do so, but assurance of consideration cannot be given except for comments received on or before this date.
Reports and guidance documents; availability, etc.:
Post-fire safe-shutdown circuit regulatory requirements,
cpp@nrc.gov
pdr@nrc.gov
rfr1@nrc.gov
sdw1@nrc.gov
http://www.nrc.gov
http://www.nrc.gov/nrc/adams/index.html
Federal Register
Vol. 70, no. 92
Office of the Federal Register, National Archives and Records Administration
2005-05-13
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https://www.govinfo.gov/content/pkg/FR-2005-05-13/xml/FR-2005-05-13.xml
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