ML20197J124
| ML20197J124 | |
| Person / Time | |
|---|---|
| Issue date: | 10/10/1984 |
| From: | Bernero R Office of Nuclear Reactor Regulation |
| To: | Speis T Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8410290282 | |
| Download: ML20197J124 (2) | |
Text
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T DDT 10 154 MEMORANDUM FOR:
Theels..A 4pels -Director r
D4vts h e Sofety4echnology 1.01 FROM:
Robert M. Bernero, Director Division of Systems Integration
SUBJECT:
REQUEST FOR PRIORITIZATION OF GENERIC SAFETY ISSUE - BREAK PLUS SINGLE FAILURE IN BWR WATER LEVEL INSTRUMENTATION Generic Issue 50
" Reactor Vessel Level Instrumentation in BWRs" addressed several areas of concern with BWR water level instrumentation.
Resolution of Generic Issue 50 involved voluntary implementation of water level improvements by the BWR owners for all of the staff concerns except the one related to a break in an instrument line in conjunction with the worst single failure. This concern has been called the "Michelson Concern" by the BWR owners because it was first identified in a AE0D draft report by M. Chiramal and F. Ashe which was transmitted to NRR under Michelson's signature in July, 1981.
I am enclosing a copy of the draft report by Chiramal and Ashe, and comments on the draft report as background discussion of the problem.
I am also enclosing a recent simplified value-impact analysis performed by the Reliability and Risk Assessment Branch for the Michelson Concern.
I request that this issue by evaluated by DST and a priority for the investigation assigned.
Because of its relationship to Generic Issue 50, I request that the evaluation /prioritization be completed this fiscal year.
D~
Robert M. Bernero, Director Division of Systems Integration
Enclosures:
See next page cc:
W. Minners A. Thadani F. Rowsome H. Denton E. Case H. Thompson D. Eisenhut R. Vollmer 9y102 W5282 2pp Xi%.
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T. Speis ;
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Enclosures:
1.
Memorandum from A. Thadani to B. Sheron, " Reactor Vessel Level Instrumentation in BWR's (Generic Issue 50)," dated August 2, 1984.
2.
Memorandum from H. Denton to C. Michelson, "AEOD Preliminary Report:
Safety Concern Associated With Reactor Vessel Level Instrumentation in Boiling Water Reactors," dated October 30, 1981.
3.
Letter from W. Layman (NSAC) to C. Michelson (AE00),
dated October 26, 1981.
4.
Letter from S. Rosen (AD) to C. Michelson (AE00), re:
AE00's case study on level instrumentation performance in boiling water reactors, dated October 22, 1981.
5.
Memorandum from V. Stello to C. Michelson, " Review of Case Study Report - Safety Concerns Associated With Reactor Vessel Instrumentation in Boiling Water Reactors, dated October 1981.
6.
Memorandum from D. Eisenhut to H. Denton, "AEOD Preliminary Report - Safety Concern Associated With e,
Reactor Vessel Level Instrumentation in Boiling Water
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Reactors, dated September 1981," dated September 11, 1981.
7.
Memorandum from J. Sniezek to B. Grier, J. O'Reilly, J. Keppler, K. Seyfrit, R. Engelken, "IE Information Notice No. 81-25:
Open Equalizing Valve of Differential Pressure Transmitter Causes Reactor Scram and Loss of Redundant Safety Signals," dated August 21, 1981.
8.
Memorandum from D. Eisenhut to S. Hanauer, R. Mattson, T. Murley, R. Vollmer, "AEOD Preliminary Report:
Safety Concern Associated With Reactor Vessel Level Instrumentation in Boiling Water Reactors," dated September 14, 1981.
9.
Report:
" Safety Concern Associated With Reactor Vessel Level Instrumentation in Boiling Water Reactors" by M.
Chiramal and F. Ashe (AE00), dated January 1982.
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