ML20028D941

Forwards LER 82-161/03L-0.Detailed Event Analysis Submitted

ML20028D941
Person / Time
Site:	San Onofre
Issue date:	01/05/1983
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20028D942	List: ML20028D941 ML20028D947
References
NUDOCS 8301200104
Download: ML20028D941 (2)

Text

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Southern California Edison Company Q]4 SCE j S AN ONOFRE NUCLE AR GENER ATING ST A TION /I P .O. s o x t a s d S AN C LEME NT E. C ALIFOR NI A 92672 7 H. B. R AY TELEPHONE AE]

ST ATION M AN AGE R January 5,1983 <""*"-"a 1

i i U.S. Nuclear Regulatory Commission 4

Office of Inspection and Enforcement Region V l 1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5368 Attention: Mr. R. H. Engelken, Regional Administrator .

Subject:

Docket No. 50-361

30-Day Report

. Licensee Event Report No.82-161 l San Onofre Nuclear Generating Station, Unit 2 l

Pursuant to Section 6.9.1.13.b of Appendix A Technical Specification to i Operating License NPF-10 for San Onofre Unit 2, this submittal provides the required 30-day written report and copy of Licensee Event Report (LER) for an occurrence involving the Condensate Storage Tank T-120 low water level .

Limiting Condition for Operation (LCO) 3.7.1.3 requires the Condensate Storage Tank T-120 to be operable in Modes 1, 2, and 3 with a contained water volume of at least 280,000 gallons. On December 6,1982, at 1340 while in Mode 1, the water level in tank T-120 dropped below this required limit, the tank was declared inoperable, and the Action statement asso-ciated with LC0 3.7.1.3 was entered. This Action statement requires the inoperable tank to be returned to service within four hours or cooldown l must be initiated.

! The lowering of. tank T-120 level below the required limit was caused by

! manual overboarding of the Northeast Condenser Hot Well while T-120 was lined up for make-up from the demineralized water system. This resulted in water usage in excess of make-up capability. Corrective measures included restoring the water level to the required limit within 35 minutes. The tank was declared operable and the LC0 satisfied.

Corrective actions to prevent recurrence will include refresher training for operators on condenser hot well level control system operations.

Also, an engineering evaluation to implement an automatic level control system is under way. The completion date for this evaluation has not j been established. However, when the date is established, the LER will be revised, f

8301200104 830105

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DR ADOCK 05000 -g

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Mr. R. H. Engelken January 5,1983 The public health and safety were not affected since the tank was restored to operable status within the permissible time. The attached LER 82-161 addresses this event.

If there are any questions, please contact me.

Sincerely,

/ 0 f

Enclosure:

LER 82-161 cc: A.E. Chaffee (USNRC Resident Inspector, San Onofre, Units 2 and 3)

U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement 1

U.S. Nuclear Regulatory Commission Office of Management Information & Program Control (MIPC)

Institute of Nuclear Power Operation (INPO) i

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