ML13304A392

Forwards Component Cooling Water Sys Operability Assessment, Documenting Results of Phase 2 Portion of Reassessment Program.Concern Re Potential Spurious Actuation in Conjunction W/Dbe Will Be Addressed in Future LER

ML13304A392
Person / Time
Site:	San Onofre
Issue date:	12/16/1988
From:	Medford M Southern California Edison Co
To:	Martin J NRC/IE, NRC Region 4
Shared Package
ML13304A393	List: ML13304A392
References
NUDOCS 8901180250
Download: ML13304A392 (2)

Text

AG CELE RATDED TRJBUTION DEMONSTRATION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:8901180250 DOC.DATE: 88/12/16 NOTARIZED: NO DOCKET #

FACIL:50-361 San Onofre Nuclear Station, Unit 2, Southern Californ 05000361 50-362 San Onofre Nuclear Station, Unit 3, Southern Californ 05000362 AUTH.NAME AUTHOR AFFILIATION MEDFORD,M.O.

Southern California Edison Co.

RECIP.NAME RECIPIENT AFFILIATION MARTIN.J.B.

Region 5, Ofc of the Director

SUBJECT:

Forwards "Compoiqent Cooling Water Sys Operability I

Assessment."

DISTRIBUTION CODE: IE01D COPIES RECEIVED:LTR ENCL SIZE:

TITLE: General (50 Dkt)-Insp Rept/Notice of Violation Response S

NOTES:

RECIPIENT COPIES RECIPIENT COPIES A

ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 PD 1

1 HICKMAN,D 1

1 D

INTERNAL: ACRS 2

2 AEOD 1

1 AEOD/DEIIB 1

1 DEDRO 1

1 D

NRR SHANKMAN,S 1

1 NRR/DEST DIR 1

1 NRR/DLPQ/PEB 11 1

1 NRR/DLPQ/QAB 10 1

1 S

NRR/DOEA DIR 11 1

1 NRR/DREP/EPB 10 1

1 NRR/DREP/RPB 10 2

2 NRR/DRIS DIR 9A 1

1 NRR/PMAS/ILRB12 1

1 NUDOCS-ABSTRACT 1

1 OE LIEBERMAN,J 1

1 OGC/HDS2 1

1 02 1

1 RGN5 FILE 01 1

1 EXTERNAL: LPDR 1

1 NRC PDR 1

1 NSIC 1

1 RESL MARTIN,D 1

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NOTE TO AL "RIDS" RECIPIEUTS:

S PLEASE HELP US TO REDU STE!

ONTACT THE DOCUMENT CONTROL DESK, ROOM P1-37 (EXr. 20079) TO ELDMNTE YOUR NAME FacM DISTRIBUIONC LISTS FOR DOCUMENIS YOU DON'T NEED!

TOTAL NUMBER OF COPIES REQUIRED: LTTR 26 ENCL

$4

r70 Southern California Edison Company P. 0.

BOX 800 i

2244 WALNUT GROVE AVENUE ROSEMEAD, CALIFORNIA 91770 M.O.MEDFORD TELEPHONE MANAGER OF December 16, 1988 (818) 302-1749 NUCLEAR REGULATORY AFFAIRS U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5368 Attention: Mr. John B. Martin

Subject:

Docket Nos. 50-361 and 50-362 Component Cooling Water System Review San Onofre Nuclear Generating Station Units 2 and 3

References:

1. Letter to Mr. J. B. Martin (NRC) from Mr. M. 0. Medford (SCE),

dated November 30, 1988, Same subject

2. 'Letter to Mr. J. B. Martin (NRC) from Mr. C. B. McCarthy (SCE) dated June 24, 1988, Same subject SCE's letter dated November 30, 1988 (Reference 1) provided an overview and status of a two-phase program to conduct a comprehensive Component Cooling Water (CCW) system reassessment for San Onofre Units 2 and 3. The results of the initial phase of the program were transmitted to the NRC by letter dated June 24, 1988 (Reference 2).

The second phase of the program is now complete. The enclosure contains the "Component Cooling Water System Operability Assessment" report which documents the results of the phase two portion of the program. Our assessment identified a condition where CCW valves with non-Class 1E powered control circuits could potentially spuriously actuate in conjunction with a design basis earthquake. This issue was discussed with the NRC in a telephone call and a one-hour report on December 15, 1988. Corrective action is being pursued to resolve this concern. A Licensee Event Report addressing this condition will be submitted within 30 days. In addition, SCE will continue to evaluate potential design modifications to enhance overall CCW system operation.

If you have any questi6ns regarding this matter, please call me.

G.3 121 IS

~

Very truly yours, 890411_0250 811 PDRL ADOC6 050031 Enclosure cc: D. E. Hickman, NRC Project Manager, San Onofre Units 2 and 3 F. R. Huey, NRC Senior Resident Inspector, San Onofre Units 1, 2 and 3