ML20063P501

Forwards LERs 82-107/03L-0,82-119/03L-0 & 82-121/03L-0. Detailed Event Analysis Submitted

ML20063P501
Person / Time
Site:	San Onofre
Issue date:	10/01/1982
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20063P502	List: ML20063P501
References
NUDOCS 8210130469
Download: ML20063P501 (2)

Text

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P.O. B O X 12 0 -4 f S AN C LEMENTE. C A LIFOR NI A 926,2 H. B. R AY tEttawont Srafic=MANaaca October 1, 1982 m i .,,,..

U. S. Nuclear Regulatory Commission Of fice of inspection and Enforcement Reglon V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5368 Attention: Mr. R. H. Engelken, Regional Administrator

Subject:

Docket No. 50-361 30-Day Reports Licensee Event Reports Nos.82-107, 82-119 and 82-121 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 required 30-day written reports and copies of Licensee Event Reports

( LER's) for three similar occurrences 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 September 2,1982 at 2250 while in Mode 2, the water level in Condensate Storage Tank T-120 dNpped below this required Iimit, the tank was declared inoperable, ano the Action Statement associated with LCO 3.7.1.3 was entered. This Action Statement requires the Inoperable tank to be returned to service within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> or cooldown must be initiated.

The cause of this incident was insuf ficient attention being directed toward maintenance of the minimum water volume during operations involving high water usage; in this particular instance condensate water was being used to f eed the steam generators during blowdown in an attenpt to adjust steam generator chemistry.

Corrective measures to restore water level were in progress prior to the level falling below the required limit, however, these measures were not suf ficient to _ prevent the ievel f rom dropping below the iimit for approximately I hour and 40 minutes, at which time the level was restored to the required Iimit and the LCO again satisfled.

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- R.' H. Engel ken : October 1,.1982

, This occurrence was repeated on September 19, 1982 and September 20,

-1982.' Corrective measures to prevent recurrence were discussed among all SRO's_ and RO's and will include better pre-planning to anticipate water usage requirements.more accurately and to ensure adequate water of acceptable quality is available.

In each of these events public health and safety was not af fected since the. tanks were restored to operable status within the permissible time.

Also, the operating history at ihls point in plant start-up precludes any significant decay heat. Attached LER's82-107, 82-119 and 82-121~.

address these events.

If there are any questions, please . contact me.

Sincerely, H1> h /77644

Enclosures:

LER's82-107, 82-119 and 82-121 cc: ' A. E. Chaf fee (USNRC Resident inspector, San Onofre Unit 2)

U. S. Nuclear Regulatory Commission Of fice of Inspection and Enforcement U. S. Nuclear Regulatory Commission Office of Management Information & Program Control Institute of Nuclear Power Operations V

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