ML17277B810

Discusses Mods to Component Cooling Water Sys Boundary Valves Inside Containment.Fully Operational Containment Isolation Actuation Signal Will Be Added to Valves within 90 Days

ML17277B810
Person / Time
Site:	San Onofre
Issue date:	12/22/1982
From:	Baskin K SOUTHERN CALIFORNIA EDISON CO.
To:	Knighton G Office of Nuclear Reactor Regulation
References
NUDOCS 8301030016
Download: ML17277B810 (5)

Text

0 j REGULATORY i ORMATION DISTRIBUTION SYS A (RIDS)

>OCRSSION NBR ~ 8301030016 DOC ~ DATE ~ 82/12/22 NOTARIZED NO DOCKET

'FACIL:50 361 San Onofre Nuclear Stationi Unit 2i Southern Californ 05000361

.50-362 San Onofre Nuclear Stations Unit 3i Southern BYNAME Californ 05000362 AUTH AUTHOR AFFILIATION BASK INiK~ P ~ Southern California Edison Co ~

REC IP ~ NAME RECIPIENT AFFILIATION KNIGHTONg G I W ~ Licensing Branch 3

SUBJECT:

Discusses mods to component cooling water sys boundary valves inside containment, Fully operational containment isolation actuation signal will be added to valves within 90 days.

DISTRIBUTION CODE: B021S COPIES RECEIVED!LTR L ENCL 1 SIZE:

TITLE: OR/Licensing Submitta): Combined General Distribution'OTES:J Hanchett icy PDR Documents, ELD Chandler icy. 05000361 NRR Scaletti icy' Hanchett icy PDR Documents. ELD Chandler icy. 05000362 NRR Scaletti icy.

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.'I I (lf "k )j I 'I jg ~l ii l( I I IWWN fly I f ', ll $ ~$ ,,<<(if'( I , A '.I I 1 4 W, 'I << 4 f Southern California Edison Company P. O. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD. CALIFORNIA 91770 K. P. BASKIN TELEPHONE E December 22, 1982 I2I3) ST2 I40I ~ MANAGER OP NUCLEAR ENGINEERING, SASETY, ANO LICENSING Director, Office of Nuclear Reactor Regulation Attention: Hr. George W. Knighton, Branch Chief Licensing Branch No. 3 U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Gentlemen:

Subject:

Docket Nos. 50-361 and 50-362 San Onofre Nuclear Generating Station Units 2 and 3 The purpose of this letter is to discuss forthcoming modifications to the Component Cooling Water(CCW) System boundary valves inside containment (HV-6223 and HV-6236). In recent meetings with Southern California Edison Company(SCE) the NRC has expressed a concern that these valves do not receive a Containment Isolation Actuation Signal(CIAS).

On an expedited basis, but at least within 90 days of the date of this letter, SCE will install and make fully operational a CIAS signal(with operator override capability) to the subject valves. The need for the 90 day period is based on material delivery schedules(e.g., electrical relays) and the time required to install and test the signals. The SONGS Units 2 and 3 Final Safety Analysis Report(FSAR), Chapter 6 currently states that the CCW System meets GDC 57. Following completion of the subject modifications, the non-critical loop of the CCW System( Penetrations 42 and 43') will meet GDC 56, and FSAR Amendment 32(scheduled for issuance in March, 1983) will revise Chapter 6 to so state. Further, SCE will submit proposed technical specification changes to reflect these modifications on a schedule commensurate with the completion of these modifications.

Interim operation during the 90 day period is justified by the following. The current emergency procedures for SONGS Units 2 and 3 provide for immediate and subsequent operator actions to verify accomplishment of ECCS functions. The non-critical CCW loop isolation valves outside the con-tainment(HV-6211 and HV-6216) receive automatic close signals. Failure of one of these valves to close is indicated to the operator in the control room by a light on a panel displaying the positions of all the containment isolation valves. Upon detection of such a fai lure to close, the operator by procedure will take action to manually close from the control room the corresponding inside containment motor operated containment isolation valve(HV-6223 or HV-6236) to insure containment isolation. It should be noted that the power to valves HV-6223 and HV-6236 is not currently locked out; this is in contrast to the response to question 010.29 which currently states that power is locked out to HV-6223 and HV-6236 to minimize inadvertent closure. This section of the FSAR wi 11 also be changed in FSAR Amendment 32.

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Mr. George W. Knighton Page December 22, 1982 If you have any questions concerning the above information, please call me.

Very truly yours, cc: Harry Rood, NRC(to be opened by addressee only)

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