ML20197G176
| ML20197G176 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 12/15/1983 |
| From: | Sheron B Office of Nuclear Reactor Regulation |
| To: | Noonan V Office of Nuclear Reactor Regulation |
| References | |
| CON-WNP-0709, CON-WNP-709 NUDOCS 8312230281 | |
| Download: ML20197G176 (1) | |
Text
JISTRIBUTION W
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N[ COLLINS IODGES MEMORANDUM FOR:
Vincent Noonan, Chief, Equipment Qualification Branch, DE FROM:
Brian W. Sheron, Chief, Reactor Systems Branch, DSI
SUBJECT:
REMOVAL OF RCIC SYSTEM FROM EQP AT WNP-2
Reference:
W.E. Vesely et. al.; " Measures of Risk Importance and Their Applications" NUREG/CR-3385, July, 1983 In a letter dated July 26, 1983 from G.C. Sorensen to A. Schwencer, the Washington Public Power Supply System (the applicant) indicated its intent to remove RCIC from the WNP-2 Equipment Qualification Program (EQP). The applicant has stated that the ADS system in conjunction with the low pres-sure ECC systems provides a fully automatic backup to the high pressure core spray (HPCS) system.
We have reviewed the applicant's submittal and agree that a fully automatic backup to HPCS is available. We do not agree however, the RCIC should be removed from the EQP at this time. This position is based on the results of risk sensitivity studies performed for a BWR/6 and discussed in the ref-erence report. These results indicate that the unavailability of the RCIC system more than doubles the overall core melt frequency.
Unless it can be demonstrated that the unavailability of RCIC will not significantly increase risk at WNP-2, RCIC should be included in the EQ Program.
Original signed by:
Brian W. Sham Brian W. Sheron, Chief Reactor Systems Branch, DSI cc:
R. W. Houston A. Masciantonio RSB Section Leaders Section 8 Members R. Mattson CONTACT:
T. Collins, RSB
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