ML13308A671

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Advises That Licensee Inadvertently Omitted Info from Re Plans for Implementation of Action Item II.K.3.25 in NUREG-0737 Re Effect of Loss of Ac Power on Pump Seals. Evaluation Will Be Submitted by 820101
ML13308A671
Person / Time
Site: San Onofre 
Issue date: 01/13/1981
From: Dietch R
Southern California Edison Co
To: Crutchfield D
Office of Nuclear Reactor Regulation
References
RTR-NUREG-0737, RTR-NUREG-737, TAC 44128, TASK-2.K.3.25, TASK-TM NUDOCS 8101210527
Download: ML13308A671 (3)


Text

.EGULAf0RY INFORMATIUN D1iNIBU!IUN SYSTEM (KIDS)

ACCESSIUN NR:81U0210527; vQCDATE: 81/01/13 NOTARILkY3 DOCKET FACIE: 0-26 SanUnotre Nuclear Station, Oni 1, Southern Laitor 0502U6 ADYa-NAME AUTHOR AH1 LIATION DIETC HN.

South6ern Cal fornia Edison Co.

RECIO.AME RECIPiENI AFFILIATION GROTHFiELDD.

Operatiny Reactors Branch 5

SUBJECT:

Advises that licensee inadvertently omitted into from 810105 ftr re plans for implementation of Action Item II.K.3 25 re effect of loss of ac power on pump seals.Will submit evaluation by 82 011.

DISTRIbUTIUN COUE: AOOIS kOPIES RECEIVED:LTR ENCL.

SIZE:

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~~FILE 01 1 EXTERNAL: ACRS 09 16 1

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TOTAL NUMbEN OF COPIES REWUIRED: LTTR

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Southern California Edison Company P. 0. BOX 800 2244 WALNUT GROVE AVENUE ROBERT DIETCH ROSEMEAD, CALIFORNIA 91770 TELEPHONE VICE PRESIDENT 213-572-4144 January 13, 1981 Director, Office of Nuclear Reactor Regulation Attention: D. M. Crutchfi.eld, Chief Operating Reactors Branch No. 5 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C.

20555 Gentlemen:

Subject:

Docket No. 50-206 Clarification of TMI Action Plan Requirements San Onofre Nuclear Generating Station Unit 1 Our January 5, 1981 letter provided our response to your letter dated October 31, 1980, which forwarded NUREG-0737 containing all current TMI-related items approved for implementation by the Commission. We indicated that we intended to meet the implementation dates contained in NUREG-0737 except for certain items for which we provided a basis for deviation.

The purpose of this letter is to advise you that we inadvertently omitted information from our January 5, 1981 letter, concerning our plans relative to the implementation of Action Item II.K.3.25, Effect of Loss of Alternating-Current Power on Pump Seals, contained in NUREG-0737. During our review of NUREG-0737, we overlooked the change in the applicability of the Action Item to include Westinghouse and Combustion Engineering operating reactors and operating reactor applicants, as well as boiling water reactors.

Prior to the issuance of NUREG-0737, the Action Item had been applicable only to boiling water reactors as previously established in NRC letters dated May 7, 1980 and September 5, 1980.

Based on our review of the requirements of Action Item II.K.3.25 of NUREG-0737, we intend to provide an evaluation by January 1, 1982, to determine the consequences of a loss of cooling water to the reactor coolant pump seals for two hours due to loss of offsite power. A preliminary assessment indicates that the current cooling water design for the reactor coolant pump seals is adequate to prevent excessive loss of reactor coolant system inventory following an anticipated operational occurrence. The cooling

D. M. Crutchfield, Chief January 13, 1981 water to the pump seals is normally provided by redundant systems:

(1) the Chemical Volume and Control System using the charging pumps (seal water injection), and (2) the Component Cooling Water System using the component cooling water pumps (thermal barrier cooling coils) to cool the reactor coolant as it passes from the reactor coolant pump volute along the pump shaft to the seals.

Each of the systems is capable of providing cooling water to the pump seals independent of the other and each can be supplied power from the emergency diesel generators.

In addition, a DC powered thermal barrier emergency cooling pump is provided in the event of loss of AC power.

If our evaluation does not confirm the preliminary assessment discussed above, and modifications are determined to be necessary to prevent excessive loss of reactor coolant system inventory following an anticipated operational occurrence, we will also submit any proposed modifications by January 1, 1982, as required by NUREG-0737. However, it would be inappropriate at this time to commit to complete any proposed modifications by July 1, 1982 as required by NUREG-0737. We intend to provide a completion schedule for any proposed modifications as part of our submittal by January 1, 1982. The completion schedule will be based on (1) the extent of the proposed modifications, (2) the completion of preliminary and final design and engineering, (3) procurement lead time, (4) construction time, and (5) the scheduling of an appropriate outage, if required to complete the proposed modifications.

If you have any questions or desire additional information concerning our plans discussed above, please contact me.

Subscribed on this A3 day of 21.

1981.

Very truly yours, By y

Robert Dietch Vice President Subscribed and Swor to before me on this day of

, 1981 AGNES CRABTREE.

NOTARY PUBUC - CAUFORNIA PRINCIPAL OFFICE IN LOS ANGELES OOUNTY Notar Public in and for the County of Mipu72 Los ngeles, State of California s

Mmi

.AL cc:

R. H. Engelken, Director, OIE, Region V