05000361/LER-1982-096, Forwards LER 82-096/03L-0.Detailed Event Analysis Submitted

Forwards LER 82-096/03L-0.Detailed Event Analysis Submitted

ML20065H804
Person / Time
Site:	San Onofre
Issue date:	09/23/1982
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20065H807	List: 05000361/LER-1982-096, Forwards LER 82-096/03L-0.Detailed Event Analysis Submitted 05000361/LER-1982-096-03, /03L-0:on 820825,ECCS Subsystem High Pressure Safety Injection Pump 2P-017 Failed to Develop 1,400-psia Discharge Pressure During Operability Test.Caused by Excessive Leakage Past Miniflow Bypass Valve S2-1204-MU-184
References
NUDOCS 8210050261
Download: ML20065H804 (2)

LER-1982-096, Forwards LER 82-096/03L-0.Detailed Event Analysis Submitted

Event date:
Report date:
3611982096R00 - NRC Website

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Southern Califomia Edison Company; yp g7 y y,; WU SAN ONOFRE NUCLEAR GENER ATING STA flON P.o. sox saa s AN CLEMENTE. C ALIFORNI A 92672 H.B. RAY Yatgewon

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• September 23, 1982 U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V

- 1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5368 Attention:

Mr. R. H. Engelken, Regional Administrator

Dear Sir:

Subject: Docket No. 50-361 30-Day Report Licensee Event Report No.82-096 San Onofre Nuclear Generating Station, Unit 2 Pursuant to Section 6.9.1.13b of Appendix A, Technical Specifications to Operating License NPF-10, for San Onofre Unit 2, this submittal provides the requirad 30-day written report ~and copy of Licensee Event Report

-(LER) for an occurrence involving the High Pressure Safety injection (HPSI.) System.

Limiting Condition for Operation (LCO) 3.5,3 requires a minimum of one operable ECCS Subsystem in Mode 4.

On August 25, 1982 at 1345 whlle in Mode 4, HPSI pump 2P-017 failed to develop the required discharge pressure of 1400 psia during the operability test performed in accordance with procedure SO23-3-2.7 and was declared inoperable.

Neither of the two remaining ECCS Subsystems were operable at the time, since the Subsystem containing HPSI pump 2P-019 was in operation to recirculate the water in the Refueling Water Storage Tank and the Subsystem containing HPSI pump 2P-018 was inoperable by virtue of HPSI pump 2P-018 not being aligned to either train A or B.

Action Statement a associated with LCO 3.5.3 was-entered. This Action Statement requires at least one ECCS Subsystem be restored to operable status within one hour or be in cold shutdown ("ude.

5) within the next 20 hours2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br />. At 1445, the ECCS Subsystem containing HPSI pump 2P-018 was aligned to Train A, and after a satisfactory c,perability-test was declared operable, thus satisfying LCO 3.5.3.

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8 R. H. Engelken September 23, 1982 The inability to attain the required discharge pressure by. pump 2P-017 was attributed to excessive leakage past the miniflow bypass valve 92-1204-MU-184 to the RWST. A similar incident with the sister valve, S2-1204-MU-185 rendered the pump 2P-019 Inoperable on July 13, 1982.

However, in the previous incident LCO 3.5.3 was satisfied, no Action Statement was entered and, therefore, no LER was required.

Due to this recurring problem, the test method and mini bypass throttle valve type are the subject of an engineering evaluation currently underway.

The valve will be replaced and the procedure revised to provide for more reliable testing. A suaedule is currently being developed for completion of this work.

If there are any questions, please contact me.

Sincerely, F

V6 l1Yu %

Enclosure:

LER 82-096 cc:

A. E. Chaf fee (USNRC Resident inspector, San Onof re Unit 2)

U. S. Nuclear Regulatory Commission Office of inspection and Enforcement U. S. Nuclear Regulatory Commission Office of Management Information and Program Control institute of Nuclear Power Operations I