ML20050A000

Ro:On 820314,low Pressure Safety Injection Pump Lost Due to Air in Pump.Pumps Vented & Shutdown Cooling Restored. Investigation in Progress.Results Will Be Forwarded w/14-day Rept & Two LERs

ML20050A000
Person / Time
Site:	San Onofre
Issue date:	03/15/1982
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
NUDOCS 8203290528
Download: ML20050A000 (1)

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U. S.

Nuclear Regulatory Commission

$ ' %p Office of Inspection and Enforcement Region V A

7 rp 1450 Maria kano, Suite 210 4

Walnt* Crook, California 94596-5,368 b

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Docket ho. 50-361 l

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J San Onofre Unit 2 4

i Attention Mr. R4 II. Engolken, Director i

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This lotter,describos a reportable occurrence involving the Shutdown Cooling System. 'This submittal is in accordance g

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with the reporting requirements stipulated in Sections 6.9.1.12.b and.d of Appendix A to the Provisional Operating License NPF-10..

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With the reactor in Modo 6'on March 14', 1982, the control e

i oporator observed'that shutdown cooling via a Low Pressuro Safety-Injoction pump had boon lost due to air in ttw pump.

Th'o other pump was started ancWalso became air-bound.

The pumps werb vented

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and shutdown cooling rostored in'ninoty,(90) minutos.

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Asaronuitofthisinh'identHCSboronwasfoundtohavo I

droppod fron 2004 to 1962 ppm.

This resulted in a positivo reactivity innortion of 0.64% dolta K/K.

The nourco of this reactivity i

inmortion in unknown at thin timo.

Technical Specifications requiro boron concontration to bo maintained abovo 1720 ppm.

l bona of shutdown cooling capability did not result in a I

reduction of plant safoty becauno thoro was no irradiated fuol ing j

the coro.

An investigation in in progrona and the renulta of thin review will be forwardod to you with our 14 day report toqother with two i

1.tconnco r,vont Hoporta.

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