05000361/LER-1982-065, Forwards LER 82-065/01T-0.Detailed Event Analysis Submitted

Forwards LER 82-065/01T-0.Detailed Event Analysis Submitted

ML20071L283
Person / Time
Site:	San Onofre
Issue date:	07/23/1982
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20071L285	List: 05000361/LER-1982-065, Forwards LER 82-065/01T-0.Detailed Event Analysis Submitted
References
NUDOCS 8208020393
Download: ML20071L283 (2)

LER-2082-065, Forwards LER 82-065/01T-0.Detailed Event Analysis Submitted

Event date:
Report date:
3612082065R00 - NRC Website

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4 GEMP.'ED Southern California Edison Company 'Ig? nu, S AN ONOFRE NUC LE AR GENER ATING ST A TION w

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P.O. B O X 128 S A N C LEMENTE. C A LIFOR NI A 92672 f (- *r,.

H. B. R AY rELEPHONE Station u ANAasa July 23, 1982 m en-noo

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:

I

Subject:

Docket No. 50-361 14-day FoiIow-up Report Licensee Event Report No.82-065 San Onofre Nuclear Generating Station, Unit 2

Reference:

Letter, H. B. Ray (SCE) to R. H. Engelken (NRC),

dated July 13, 1982 The referenced letter provided you with confirmation of our prompt notification of your of fice of a reportable occurrence involving Limiting

Condition for Operation (LCO) 3.7.5 on the Control Room Emergency Air Cleanup System (CREACUS). Pursuant to Technical Specification 6.9.1.12.b, this letter provides the required foilow-up report and completed Licensee Event Report (LER) form for this occurrence.

At 0615 on July 11, 1982, while operating in Mode 4, an attempt to start emergency chiller E335 associated with Tra!n B of CREACUS, resulted in an immediate refrigerant compressor motor bearing temperature high alarm and tripping of the unit. Train B was, therefore, declared inoperable.

I Subsequent attempts to start the Train A chiller E336 resulted in no response from its compressor motor, and consequent declaration of Train A Inoperability at 0710.

At 0805 plant cooldown from Mode 4 was commenced in compliance with Technical Specification 3.0.3.

At 0850, the trip relay associated with the Train A chiller was found to be jammed in the tripped position by an improperly installed cover. The relay was cleared and testing in accordance with Technical Specification Surveillance Requirement 4.7.5.b completed at 0940. Train A was declared operable at this time and plant cooldown halted.

! F208020393 820723

PDR ADOCK 05000361 i

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. 6 Mr.'R. H. Engelken~ July 23,.1982' At 1138, the problem with Train B emergency chiller E335 was determined t.o be a faulty motor bearing temperature alarm module. Train B was declared operable at 1900 after replacement of the faulty module and completion of testing in accordance with Technical Specification Surveillance Requirement 4.7.5.b.

Both trains of the CREACUS were simultaneously inoperable for a period of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 30 minutes. Had operation of these systems been required due to an accident requiring Control Room isolation during this period, the ability to maintain Control Room temperature below 11CPF would have

-been compromised. Since no_ irradiated fuel was present in the core, there was no potential impact on the health and safety of plant personnel or the public as a result'of this occurrence, if there are any. questions regarding the above, please contact me.

Sincerely,

[ [A

Enclosure:

LER No.82-065 cc: A. E. Chaf fee (USNRC Resident inspector, San Onofre Unit 2)

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

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