05000311/LER-1982-131, Forwards LER 82-131/03L-0.Detailed Event Analysis Encl

Forwards LER 82-131/03L-0.Detailed Event Analysis Encl

ML20067B348
Person / Time
Site:	Salem
Issue date:	11/17/1982
From:	Midura H Public Service Enterprise Group
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20067B352	List: 05000311/LER-1982-131, Forwards LER 82-131/03L-0.Detailed Event Analysis Encl
References
NUDOCS 8212060165
Download: ML20067B348 (3)

LER-2082-131, Forwards LER 82-131/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3112082131R00 - NRC Website

text

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'O PSEG Public Service Electric and Gas Company P.O. Box E Hancocks Bridge, Nevi Jersey 08038 Salem Generating Station l

November 17, 1982 Mr. R. C. Haynes Regional Administrator USNRC Region 1 031 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Haynes:

LICENSE NO. DP R- 7 5 DOCKET NO. 50-311 REPORTABLE OCCURRENCE 82-131/03L Pursuant to the requirements of Salem Generating Station Unit No. 2, Technical Specifications, Section 6.9.1.9.b, we are submitting Licensee Event Report for Reportable Occurrence 82-131/03L. This report is required within thirty (30) days of the occurrence.

Sincerely yours, g ,\4[<-

H. J. Midura General Manager -

Salem Operations RF:ks ,[j[

CC: Distribution 8212060165 821117 PDR ADOCK 05000311 S PDR The Energy People . f6*

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i Report Number: 82-131/03L Report Date: 11-17-82 l

l Occurrence Date: 10-28-82 l

l Facility: Salem Generating Station Unit 2 Public Service Electric & Gas Company Hancock's Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

l Reactor Coolant System Subcooling Margin Monitor - Inoperable.

This report was' initiated by Incident Reports82-403 and 82-404.

CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 - RX Power 82% - Unit Load 910 MWe.

DESCRIPTION OF OCCURRENCE:

At 0830 hours0.00961 days <br />0.231 hours <br />0.00137 weeks <br />3.15815e-4 months <br />, October 28, 1982, during routine operation, the Control Room Operator observed that the P-250 Computer was operating erratically. Due to the malfunction of the computer, the Reactor Coolant System (RCS) subcooling margin monitor was declared ir,perable and Technical Specification Action Statement 3.3.3.7a was entered.

The computer was repaired and the subcooling monitor was satisfactorily tested. At 0250 hours0.00289 days <br />0.0694 hours <br />4.133598e-4 weeks <br />9.5125e-5 months <br />, October 29, 1982, the monitor was declared operable and Action Statement 3.3.3.7a was terminated.

The next week, however, similar problems with the computer occurred.

At 0302 hours0.0035 days <br />0.0839 hours <br />4.993386e-4 weeks <br />1.14911e-4 months <br />, November 6, 1982, the subcooling monitor was declared inoperable for a second time, and Action Statement 3.3.3.7a was re-entered.

RCS wide range temperature and pressure indication were available throughout both occurrences , allowing calculation of the subcooling margin through the use of steam tables.

APPARENT CAUSE OF OCCURRENCE:

The computer malfunctions were caused by a decrease in the output of the 4VDC power supply. The power supply tested satisfactorily, and the decrease was apparently due to drift in the output. No similar problems have been noted, and the occurrence was assumed to be of an isolated nature.

ANALYSIS _OF OCCURREN_QE:

Operability of the accident monitoring instrumentation ensures that sufficient information is available on selected plant parameters to monitor and assess these variables following an accident. Since, as noted, wide range RCS temperature and pressure instrumentation was operable, allowing determination of the subcooling margin, the events involved no risk to the health and safety of the public.

ANALYSIS OF OCCURRENCE: (cont'd)

The occurrences constituted operation in a degraded mode permitted by a limiting condition for operation and are reportable in accordance with Technical Specification 6.9.1.9b.

Action Statement 3.3.3.7a requires:

With the number of operable accident monitoring channels less than the required number of channels, restore the inoperable channel (s) to operable status within 7 days, or be in at least hot shutdown within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

CORRECTIVE ACTION:

The 4VDC power supply was adjusted for the proper output, and the P-250 !

computer was returned to operation. No further problems with the computer have been noted. At 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br />, November 6, 1982, the RCS subcooling monitor was declared operable, and Action Statement 3.3.3.7a was terminated for the second time. No further action was deemed necessary in view of the nature of the problem.

FAILURE DATA:

Problems with the P-250 computer which occurred en September 27, 1982, (See LER 82-ll6/03L) were apparently not related to the present occurrences.

Prepared By R. Frahm / ' bY e ^d G(neral' Manager -

Salem Operations SORC Meeting No. 82-102B l

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