ML19344E921
| ML19344E921 | |
| Person / Time | |
|---|---|
| Site: | Satsop |
| Issue date: | 08/27/1980 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Strand N WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| References | |
| NUDOCS 8009120102 | |
| Download: ML19344E921 (3) | |
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UNITED STATES y
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NUCLEAR REGULATORY COMMISSION 4/1 j WASHING TON. O. C. 20555
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.f Docket Nos.: 50-508 and 50-509 Washington Public Power Supply System ATTN: Mr. Neil 0. Strand Managing Director 3000 George Washington Way P. O. Box 968 Richland, Washington 99352 Dear M Strand:
SUBJECT:
INTERIM ACTIONS NEEDED FOR PLANT OPERATION PENDING FINAL RESOLUTION OF ANTICIPATED TRANSIENTS WITH FAILURE TO SCRAM (ATWS)
(COMBUSTION ENGINEERING PWR)
In December 1978 the Nuclear Regulatory Comission (NRC) staff issued Volume 3 of NUREG-0460 which describes the propo ed type of plant modifications the staff believes are necessary to reduce the risk from anticipated transients with failure to scram (ATWS) to an acceptable level. The NRC's Regulatory Requirements Review Committee completed its review in January 1979, and concurred with the staff's approach described in Volume 3 of NUREG-0460, insofar as it applies to your plant.
The staff has issued requests for the industry to supply generic analyses to confirm the ATWS mitigation capability described in Volume 3 of NUREG-0460. Subsequently, the staff plans to present its recomendations for rulemaking on ATWS to the Comi ssion. The Commission would, by rulemaking, determine the required modifications to resolve ATWS concerns and the required schedule for the implementation of such modi fications. Your plant would, of course, be subject to the Comission's decision in this matter.
Based on considerations described in pages 42 through 45, Volume 3 of NUREG-0460, the staff generally concluded that plants with operating licenses can continue to operate without undue risk to the health and safety of the public during the estimated 2 to 5 year period needed to implement the necessary modifications.
However, the staff believes the following steps should be taken as a prudent course prior to the issuance of an operating license in order to further reduce the risk from ATWS events during the interim period before the required plant modifications as detennined by the Commission are completed.
1.
An emergency operating procedure should be developed for an ATWS event, including consideration of scram indicators, rod position indicators, flux monitors, pressurizer level and pressure indicators, pressurizer relief valve and safety valve position indicators, coolant average temperature, containment temperature and pressure indicators, steam generator level, pressure and flow indicators, and any other alanns 8009120102
Y Mr. Neil 0. Strand annunciated in the control rcom including alarms not processed through the electrical portion of the reactor scram system. The emergency operating procedure should be sufficiently simplified and unambiguous to pemit prompt ATWS recognition.
2.
The emergency operating procedure should describe actions to be taken in the event of an ATWS including consideration of manually scraming the reactor by using the manual scram buttons, and prompt actuation of the auxiliary feedwater system. These actions must be taken imediately following the occurrence of the event. Actions should also include prompt initiation of boration by actuation of the high pressure safety injection system to bring the plant to a safe shutdown condition.
We require that you submit your ATWS emergency operating procedure for our review. Our review may include a visit to your plant to determine the feasibility of implementing your proposed procedures through operator simulation of the steps. Our evaluation must conclude that an acceptable procedure and operator training are completed prior to the issuance of a full power operating license.
Sincerely, MG u
Robert L. Tedesco, Assistant Director for Licensing Division of Licensing cc:
See next page
Y.
Mr. N. O. Strand cc:
Mr. B. D. Redd Jerome E. Sharfman United Engineers & Constructors, Inc.
Atomic Safety and 30 South 17th Street Licensing Appeal Board Philadelphia, Pennslylvania 19101 U. S. Nuclear Regulatory Comission Nicholas S. Reynolds, Esq.
Washington, D. C.
20555 DeBevoise & Liberman 1200 Seventeenth St., N. W.
Resident Inspector /WPPSS NPS Washington, D. C.
20036 c/o U. S. NRC P. O. Box 69 Mr. E. G. Ward Richland, Washington 99352 Senior Project Manager Babcock & Wilcox Company P. O. Box 1260 Lynchburg, Virginia 23505 Robert Lazo, Esq., Chairman Atomic Safety and Licensing Board U. S. Nuclear Regulatory Comission Washington, D. C.
20555 Dr. Donald P. deSylva Associate Professor of Marine Science Rosenthiel School of Marine and Atmospheric Science University of Miami Miami, Florida 33149 Dr. Marvin M. Mann Atomic Safety and Licensing Board U. S. Nuclear Regulatory Comission Washington, D. C.
20555 Richard S. Salzman, Chairman Atomic Safety and Licensing Appeal Board U. S. Nuclear Regulatory Comission Washington, D. C.
20555 Dr. John H. Buck Atomic Safety and Licensing Appeal Board U. S. Nuclear Regulatory Comission Washington, D. C.
20555