ML20055H573
| ML20055H573 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 07/24/1990 |
| From: | Nandy F SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-88-14, TAC-71715, NUDOCS 9007270012 | |
| Download: ML20055H573 (2) | |
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,j"'YW Southem Califomia Edison Company 23 PAMKER STREET q 4HVINE. CALIFOf INIA 92718 July 24,:1990-KR.NANDY TELEPHONE McWJeH, NUCLEAR UCENSING (714) 887 6400 e
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U. S. Nuclear Regulatory Commission :
Attention: Document Control Desk; Washington,-D. C. 20555 Gentlemen:
Subject:
Docket No. 50-362 Instrument Air System Modifications.
l San.Onofre Nuclear Generating Station.
Unit 3 (NRC Tac No. 71715) l
References:
- 1) N'lC Generic Letter 88-14. " Instrument' Air-System Problems Affecting Safety-Related Equipment" 2)
F. R. Nandy (SCE) to Document Control. Desk (NRC) letter 1
dated October 30,--1989-r 3)
L. E. Kokajko (NRC) to Harold B. Ray'(SCE) letter dated November 17, 1989-This. letter provides notification of completion of installation of backup q
nitrogen system-isolation check valves and test connections at San Onofre.
Unit-3.
Reference 1 requested Licensees to perform a design and operations l
verification of their instrument air systems. Southern California Edison (SCE) conducted this review and provided our report to'the.NRC by Reference 2.-
In that report, SCE noted that isolation valves and test connections must be
- added to the safety-related nitrogen backup system for the atmospheric dump-valves (ADVs). This modification is required to allow for et,mparison-of the ADV backup nitrogen system check valve leakage with the applicable limit.
SCE committed to complete these modifications for Units 2 and 3 during each unit's -
cycle five refueling outage.
By Reference 3, the NRC concurred with this assessment and requested. notification subsequent to completion of the modifications.
9007270012 900724 PDR ADOCK 05000362 P
PDC flool Il$
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Document Control Desk !
As stated in SCE's letter dated January 17, 1990, the Unit 2 modifications 3
were completed during the cycle five refueling outage which ended on December 8, 1989. This same modification for 'Jnit 3 was completed prior to 1
the end of the recent cycle five refueling outage.
If you have any questions or comments, please let me know.
Very truly yours,
/
cc:
J. B. Martin, Regional Administrator, NRC Region V C. Caldwell, NRC Senior Resident Inspector, San Onofra Units 1, 2 and 3 i
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