ML032730729
| ML032730729 | |
| Person / Time | |
|---|---|
| Issue date: | 09/22/2003 |
| From: | Bonaca M Advisory Committee on Reactor Safeguards |
| To: | Diaz N NRC/Chairman |
| References | |
| G20030585, LTR-03-0619, RG-1.053, Rev 1, SUNSI Review Complete | |
| Download: ML032730729 (4) | |
Text
EDO Principal Correspondence Control FROM:
DUE: 10/27/03 EDO CONTROL: G20030585 DOC DT: 09/22/03 FINAL REPLY:
Mario V. Bonaca, ACRS TO:
Chairman Diaz FOR SIGNATURE OF :
- GRN **
CRC NO: 03-0619 Travers, EDO DESC:
ROUTING:
Draft Final Revision 1 to Regulatory Guide 1.53, "Application of the Single-Failure Criterion to Safety Systems" DATE: 09/26/03 Travers Norry Paperiello Kane Collins Dean Burns/Cyr Dyer, NRR Schoenfeld,OEDO ACRS File ASSIGNED TO:
RES CONTACT:
Thadani SPECIAL INSTRUCTIONS OR REMARKS:
Prepare response to ACRS for EDO signature. Add Commissioners and SECY as cc's.
USE SUBJECT LINE IN RESPONSE.
,Dwk E-16 bs: clf-I
OFFICE OF THE SECRETARY CORRESPONDENCE CONTROL TICKET Date Printed: Sep 25,2003 17.43 PAPER NUMBER:
ACTION OFFICE:
LTR-03-0619 EDO LOGGING DATE: 09/24/2003 AUTHOR:
AFFILIATION:
ADDRESSEE:
SUBJECT:
ACTION:
DISTRIBUTION:
LETTER DATE:
ACKNOWLEDGED SPECIAL HANDLING:
Mario Bonaca ACRS Nils Diaz Draft final revision I to regulatory guide 1.53, application of the single-gailure criterion to safety systems Appropriate RF 09/22/2003 No NOTES:
FILE LOCATION:
ADAMS DATE DUE:
DATE SIGNED:
EDO -- G20030 5 8 5
UNITED STATES NUCLEAR REGULATORY COMMISSION ADVISORY COMMITTEE ON REACTOR SAFEGUARDS WASHINGTON, D.C. 20555-0001 September 22, 2003 The Honorable Nils J. Diaz Chairman U.S. Nuclear Regulatory Commission Washington, DC 20555-0001
SUBJECT:
DRAFT FINAL REVISION 1 TO REGULATORY GUIDE 1.53,,APPLICATION OF THE SINGLE-FAILURE CRITERION TO SAFETY SYSTEMS"
Dear Chairman Diaz:
During the 505"' meeting of the Advisory Committee on Reactor Safeguards, September 10-13, 2003, we met with representatives of the NRC staff and the Institute of Electrical and Electronics Engineers, Inc. (IEEE) to discuss the draft final Revision 1 to Regulatory Guide (RG) 1.53, "Application of the Single-Failure Criterion to Safety Systems." We also had the benefit of the documents referenced.
Recommendation Revision 1 to RG 1.53, "Application of the Single-Failure Criterion to Safety Systems," should be issued.
Discussion In June 1973, the NRC issued revision 0 to RG 1.53, 'Application of the Single-Failure Criterion to Safety Systems," which describes acceptable methods for complying with the NRC's regulations for meeting the single-failure criterion in the electrical power, instrumentation, and control portions of nuclear power generating station safety systems.
Revision 0 conditionally endorses IEEE Std 379-1972, aIEEE Trial-Use Guide for the Application of the Single-Failure Criterion to Nuclear Power Generating Station Protection Systems."
The NRC staff has never updated RG 1.53 as had been planned at the time of issuance. The IEEE revised and published new editions of Std 379 in 1977,1988,1994, and 2000. These later editions clarified and strengthened the procedure for a single-failure analysis and provided additional guidance to address single-failure analysis in designs that use digital computers. These editions also provided guidance for applying the single-failure criterion to shared systems on using a probabilistic assessment to determine whether certain failures and events can be excluded from a single-failure analysis.
Given the outdated guidance in RG 1.53, licensees have been using various editions of IEEE Std 379 when making modifications to their plants. Revision 1 to RG 1.53 endorses IEEE Std 379-2000, 'IEEE Standard Application of the Single-Failure Criterion to Nuclear
I 2
Power Generating Station Safety Systems," which provides methods acceptable to the NRC staff for satisfying the NRC's regulations with respect to the application of the single-failure criterion to the electrical power, Instrumentation, and control portions of nuclear power plant safety systems. Revision 1 to RG 1.53 should be issued.
Sincerely, Mario V. Bonaca Chairman
References:
(1)
Memorandum dated July 11, 2003, from Ashok Thadani, Director, Office of Nuclear Regulatory Research, to John T. Larkins, Executive Director, ACRS,
Subject:
Revision 1 of Regulatory Guide 1.53, OApplication of the Single-Failure Criterion to Safety Systems."
(2)
U.S. Nuclear Regulatory Commission, Office of Nuclear Regulatory Research, Draft Regulatory Guide DG-1 118, "Application of the Single-Failure Criterion to Safety Systems," May 2002.
(3)
The Institute of Electrical and Electronics Engineers, Inc., IEEE Std 379-2000 (Revision of IEEE Std 379-1994), 'IEEE Standard Application of the Single-Failure Criterion to Nuclear Power Generating Station Safety Systems," September 21, 2000.