ML20062M716

Forwards LERs 82-044/03L-0,82-049/03L-0,82-050/03L-0, 82-051/03L-0,82-053/03L-0,82-057/03L-0,82-068/03L-0 & 82-071/03L-0.Detailed Event Analysis Submitted

ML20062M716
Person / Time
Site:	San Onofre
Issue date:	08/13/1982
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20062M718	List: ML20062M716
References
NUDOCS 8208200182
Download: ML20062M716 (2)

Text

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Southern California Edison Company .. 5;LL=

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S AN ONOF RE NUC LE A R GE NER A T!NG M r A TION P .O. B O R 128 S A N C L EME N T E, C A LIF OR NI A 92672 H. B. R AY trLepwoNE

,r.r.O N - A uo r a August 13, 1982 m . i . ., m.

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:

Subject : Docket No.53-361 I 30-Lay Report I Licenst.e Event Reports Nos.82-044, 82-049,82-050 l 82-051,82-053, 82-057,82-068, and 82-071 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 for eight similar occurrences involving the Condensate Storage Tank T-121 low water level .

Limiting Condition for Operation (LCO) 3.7.1.3 requires that while in Fbdes 1 - 3, the Condensate Storage Tank T-121 must be operable with a contained volume of at least 144,000 gallons. The associated Action Statement requires that with the tank declared inoperable, it must be returned to operable status within four hours or be in at least hot standby (Mode 3) within the next six hours and in hot shutdown (Mode 4) within the following six hours. The Surveillance Requirement 4.7.1.3 requires verification of the contained water volume at least once each 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

On July 15, 1982, while in Mode 3, on three occasions while feeding the steam generators using the Auxiliary Feedwater Pumps, the water level in tank T-121 fell below the allowable limit. This tank receives its makeup water from tank T-120. However, tank T-121 has its overflow set about 5,000 gallons above the Technical Specification limit of 144,000 gallons. Thus, prompt operator action is required to prevent entering the LC0 Action Statement.

8208200182 820013 PDR ADOCK 05000361 S PDR 2

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Mr. R. H. Engelken August 13, 1982 These occurrences result frem the difficulty of controlling the makeup ,

to tank T-121 in such a fashion as to maintain the contained water volume within the tight tolerance represented by the overflow level and the Technical Specification limit for minimum level. Corrective actions being taken include: 1) A Technical Specification change is being  ;

requested from the NRC which specifies the minimum allowable water inventory as a function of power history (decay heat), and 2) a design change to install an automatic tank level control system will be implemented (expected to be installed prior to operation at 100% power). ,

This situation has no safety significance because the operating history at this point in plant startup precludes any significant decay heat.

The violations of Technical Specification 3.7.1.3 occurred numerous times and will continue to occur until the proposed Technical Specification -

change is approved. LER 82-044 addresses the occurrences on July 15, 1982. LER 82-049,82-050, 82-051,82-053, 82-057,82-068, and 82-071 address the same type of occurrences on July 16,17,18,19, 20, 28, and l 27, 1982, respectively.

If there are any questions, please contact me.

Sincerely,

/ 6/

i Enclosures (LER's82-044, 82-049,82-050,'82-051,82-053, 82-057,82-068, and 82-071) cc: U.S. Nuclear Regulatory Commission ,

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Office of Management Information & Program Control INP0 (Institute of Nuclear Power Operations)

A.E. Chaffee (USNRC Resident Inspector, San Onofre, Unit 2)

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