ML20197G176

Discusses Util Indicating Intent to Remove RCIC from Equipment Qualification Program (Eqp).Unless Unavailability of RCIC Will Not Increase Core Melt Frequency,Should Be Included in Eqp

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 ET4tP' 1 1/

3/:: kNP-2 INSR/F ERON DEC 151984 ~

IODGES N[ COLLINS 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

- X24478

/g G312230291 831215 N eF ADOCK 05000397 )

A OF- ,/

W -

f o -w

}4 DSU

} '

__ 3 _ - - - - - - - .

DSI;RSB g t, DSI:, RSB 9~ -

TCOLLINS:GD[ WHODGES BSHERON 4 12/g /83 l 12/ls/83 ., 12//h83 i x m M~~ yx.b CFFDC8AW @RCARA C10fW