ML13317B207

Advises That SE Does Not Preclude from Leaving Reactor Coolant Pump RCP Trip Feature Installed,Per , However,Rcp Trip Feature May Create Spurious Hazard & Should Be Evaluated as Such

ML13317B207
Person / Time
Site:	San Onofre
Issue date:	10/16/1990
From:	Tatum J Office of Nuclear Reactor Regulation
To:	Southern California Edison Co
References
TAC-60514 NUDOCS 9010310135
Download: ML13317B207 (3)

Text

October 16, 1990 Docket No. 50-206 DISTRIBUTION UDocket File JTatum (2)

Mr. Harold B. Ray NRC & LPDRs JDyer Senior Vice President OGC BGrimes Southern California Edison Company PDV Reading EJordan Irvine Operations Center PDV Plant BJones 23 Parker Street ACRS (10)

SWu Irvine, CA 92718 MVirgilio

SUBJECT:

REACTOR COOLANT PUMP TRIP -

SAN ONOFRE NUCLEAR GENERATING STATION, UNIT NO. 1 (TAC NO. 60514)

By letter dated July 23, 1990, you provided information describing your intentions to leave the reactor coolant pump (RCP) automatic trip feature installed. Based on your review, you concluded that the RCP trip feature would be beneficial because it increases the margin available in the auxiliary electrical system during certain accident scenarios. However, because your RCP trip feature is not single failure proof, you plan to assume continued operation of the RCPs in your safety analysis.

By letter dated August 30, 1989, we provided you with our Safety Evaluation (SE) which approved your plans to remove the RCP trip feature at San Onofre Unit 1. Our SE does not preclude you from leaving the RCP trip feature installed for operational convenience if you so desire. However, the RCP trip feature may create a spurious RCP trip hazard and should be evaluated in this regard. If the results of your evaluation indicates that the RCP trip hazard could pose a "worst case scenario," then your safety analyses should credit the RCP trip hazard accordingly.

If you have any questions regarding our position on this matter, please contact us.

Sincerely, Original signed by James E. Tatum, Project Manager Project Directorate V Division of Reactor Projects - III, IV, V and Special Projects Office of Nuclear Reactor Regulation cc:

See next page OFC

DRSP:LA:PDV

DRSP:PDV M

SRXB

PDV:(A)D :

T:

NAME :DFoster:

pm

BJo s*

Dyer DATE lb //1/90

C' /C/90

J //900 OFFICIAL RECORD COPY Document Name: 501 RAI TAC 60514 9010:310135 9 l'DR ADOCK:. 05000206 0

P PDC

\\\\t

Mr. Harold B. Ray San Onofre Nuclear Generating Southern California Edison Company Station, Unit No. 1 cc David R. Pigott Mr. Richard J. Kosiba, Project Manager Orrick, Herrington & Sutcliffe Bechtel Power Corporation 600 Montgomery Street 12440 E. Imperial Highway San Francisco, California 94111 Norwalk, California 90650 Mr. Robert G. Lacy Mr. Phil Johnson Manager, Nuclear U.S. Nuclear Regulatory Commission San Diego Gas & Electric Company Region V P. 0. Box 1831 1450 Maria Lane, Suite 210 San Diego, California 92112 Walnut Creek, California 94596 Resident Inspector/San Onofre NPS U.S. NRC P. 0. Box 4329 San Clemente, California 92672 Mayor City of San Clemente San Clemente, California 92672 Chairman Board of Supervisors County of San Diego 1600 Pacific Highway Room 335 San Diego, California 92101 Regional Administrator, Region V U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Mr. John Hickman Senior Health Physicist Environmental Radioactive Management Unit Environmental Management Branch State Department of Health Services 714 P Street, Room 616 Sacramento, California 95814 Mr. Don Womeldorf Chief, Environmental Management California Department of Health 714 P Street, Room 616 Sacramento, California 95814 Mr.

Pil Jhnso

DISTRIBUTION Docketor Central-File->,

NRC & Local PDRs PD5 Reading T. Murley/J. Sniezek J. Partlow D. Crutchfield M. Virgilio

3. Tatum C. Haughney OGC E. Jordan B. Grimes Receptionist (OWFN)

NRC Participants ACRS (10)

GPA/PA V. Wilson N. Green M. Slosson MS 17G21 J. Gilliland G. Cook D. Foster