ML20024D898

LER 83-073/01T-0:on 830714,discovered That Certain Core Protection Calculator Addressable Constants in Channels B & D Did Not Comply W/Most Recent Values in Log.Caused by Default Constants Being Left in channels.W/830729 Ltr

ML20024D898
Person / Time
Site:	San Onofre
Issue date:	07/29/1983
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
LER-83-073-01T, LER-83-73-1T, NUDOCS 8308080386
Download: ML20024D898 (4)

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES io l o !2 l lWith the Unit in Mode 1 and followin completion of a channel functional test on l la la l l Core Protection Calculator (CPC) Channel A, a routine channel comparison was l o 4 l conducted. During this comparison it was discovered that certain CPC addressablq lo is liconstants in Channels B_ and D did not comply with the most recent values contained lo ls l Lin the CPC Addressable Constant Loa. The incorrect values were assumed to be l lo l7 lInonconservative and CPC Channels B and D were declared inoperable ir) accordance l lo ls l lwith Technical Specification 2.2.2 at 1630. Public health and safety were not l 1

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9. 94 3 .7 4. 4 4. 4 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h lilo llInoperability of CPC Channels B and D was due to addressable constants from the__j lili llchannel functional test data base (i.e., " default" constants) being left in the l li l 2 i lchannels following comoletion of the 18-month channel calibration and function,al_]

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ATTACHMENT TO LER 83-073 SOUTHERN CALIFORNIA EDISON COMPANY SAN ONOFRE NUCLEAR GENERATING STATION UNIT NO. 2, DOCKET NO. 50-361 SUPPLEMENTAL INFORMATION FOR CAUSE DESCRIPTION AND CORRECTIVE ACTION

A preliminary evaluation by Combustion Engineering, Inc. (CE)

concluded that the use of default values for the addressable constants did not violate safety margins for 50% power operation.

A final evaluation will be performed and if results to the contrary are obtained, a revision to this LER will be submitted.

As corrective action to prevent recurrence of this event, Computer Engineering is developing a program requiring a second verification of CPC constants on a periodic basis.

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0t Southern California Edison Company S AN ONOFRE NUCLE AR GENER A TING ST A TION l'83 gr3 f

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P .O. B O X 12 8 S AN C LEMENTE C ALIFORNI A 92672 /

H. B. R AY d vetspHONE S v A,10 N . A N A. . . July 29, 1983 i,.l..,.,,.

t U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5368

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Attention: Mr. J.B. Martin, Regional Administrator

Subject:

Docket No. 50-361 14-Day Follow-Up Report Licensee Event Report No.83-073 San Onofre Nuclear Gen'erating Station, Unit 2

Reference:

Letter, H B. Ray, (SCE) to J. B. Martin (NRC),

dated July 15, 1982 The referenced letter provided you with confirmation of our prompt notification of a reportable occurrence involving the Core Protection Calculators (CPC).

3 Pursuant to Section 6.9.1.12.b of Appendix A, Technical Specifications to Facility Operating License NPP-10 for San Onofre Unit 2, this submittal provides the required 14-day follow-up report and a copy of Licensee Event Report (LER)

No.83-073 to address this event.

If there are any guestions regarding the above, please contact me.

Sincerely, i H6 lncurris

Enclosure:

LER No.83-073 l

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. Mr. J.B. M2rtin cc: A.E. Chaffee (USNRC Resident Inspector, Units 2 and 3)

J.P. Stewart (USNRC Resident Inspector, Units 2 and 3)

U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Division of Technical Information and Document Control ,

Institute of Nuclear Power Operations (INPO)

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