05000206/LER-1982-007, Forwards LER 82-007/03L-0.Detailed Event Analysis Submitted

Forwards LER 82-007/03L-0.Detailed Event Analysis Submitted

ML20042B031
Person / Time
Site:	San Onofre
Issue date:	03/05/1982
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20042B032	List: 05000206/LER-1982-007, Forwards LER 82-007/03L-0.Detailed Event Analysis Submitted 05000206/LER-1982-007-03, /03L-0:on 820208,south Saltwater Cooling Pump (G13B) Declared Inoperable.Caused by Random Failure of Discharge Pressure switch,PS-39.Pressure Switch Replaced
References
TAC-65149, NUDOCS 8203240418
Download: ML20042B031 (2)

LER-1982-007, Forwards LER 82-007/03L-0.Detailed Event Analysis Submitted

Event date:
Report date:
2061982007R00 - NRC Website

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Licensee Event Report No.82-007 San Onofre Nuclear Generating Station, Unit 1 Attention:

Mr.

R.

H.

Engelken, Director

Dear Mr. Engelken:

This letter describes a reportable occurrence involving the operability of the South Salt Water Cooling Pump.

Submittal is in accordance with the requirements stipulated in Section 6.9.2 of Appendix A to the Provisional Operating License DPR-13.

On February 8, 1982, the plant was operating at 82% power and weekly equipment rotation was in process on the Salt Water Cooling Pump (SWCP).

This involved placing the South SWCP (G13B) in service and securing the North SWCP (G13A).

Three attempts were made.

During each attempt, the South pump developed normal discharge pressure, however, the discharge valve (POV-6) inadvertently shut approximately 2 to 3 seconds after the pump started.

At 0845 hours0.00978 days <br />0.235 hours <br />0.0014 weeks <br />3.215225e-4 months <br /> the South SWCP was declared inoperable.

Subsequent investigation revealed that the inadvertent closing of POV-6 was due to a random failure of the discharge pressure switch (PS-29) upstream of the South SWCP discharge valve, POV-6.

Its' function, upon low discharge pressure of the

)

South SWCP, is to start the standby SWCP (north) and shut POV-6.

Since the North SWCP was already running, the failed pressure 3

switch resulted only in the closing of POV-6.

The operation of the North SWCP was not affected.

PS-29 was replaced and POV-6

//

8203240418 820305 PDR ADOCK 05000206 O

PDR i

e was tested satisfactorily.

At 1524 hours0.0176 days <br />0.423 hours <br />0.00252 weeks <br />5.79882e-4 months <br /> the South SWCP was returned to full operational status.

• A similar pressure switch (PS-28) is located at the discharge of the North SWCP and was functioning properly.

In light of the random failure sustained by PS-29, and the fact that both switches are of the same age, a replacement for PS-28 has been ordered and will be installed when available.

Presently Technical Specification 3. 3.1. A. (1).h requires that two Saltwater Cooling Pumps be operable whenever the reactor is critical or Reactor Coolant System is greater than 200 F.

Additionally, Section 3. 3.1.B (6) allows maintenance to be performed on one of the two Salt Water Cooling Pumps for a period of 72 consecutive hours.

During this Event, the South SWCP was in a non-operational status for 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />, 39 minutes.

There was no interruption of Salt Water Cooling Flow and public safety was not affected.

Should you require additional information, please contact me.

I j

Sincerely,

/

Enclosure:

Licensing Event Report LER 82-007 cc:

U.S.

Nuclear Regulatory Commission Office of Inspection and Enforcement U.S.

Nuclear Regulatory Commission Office of Management Information & Program Control Institute of Nuclear Power Operations (INPO)

L.

F. Miller - USNRC Resident Inspector