05000362/LER-1983-073, /03L-0:on 830929,boronmeter 3AE0203 Rendered Inoperable When Manual Isolation Valves S31208MU084 & S31208MU091 Closed.Caused by Improper Sys Lineup.Corrective Actions Described in LER 83-073/03L-0

/03L-0:on 830929,boronmeter 3AE0203 Rendered Inoperable When Manual Isolation Valves S31208MU084 & S31208MU091 Closed.Caused by Improper Sys Lineup.Corrective Actions Described in LER 83-073/03L-0

ML20081G741
Person / Time
Site:	San Onofre
Issue date:	10/27/1983
From:	Haynes J SOUTHERN CALIFORNIA EDISON CO.
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
LER-83-078-03L-01, LER-83-78-3L-1, NUDOCS 8311070168
Download: ML20081G741 (3)

LER-2083-073, /03L-0:on 830929,boronmeter 3AE0203 Rendered Inoperable When Manual Isolation Valves S31208MU084 & S31208MU091 Closed.Caused by Improper Sys Lineup.Corrective Actions Described in LER 83-073/03L-0

Event date:
Report date:
3622083073R00 - NRC Website

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EVENT DESCRIPTION AND PROPA8LE CONSEOUENCES h lol2]l With Unit 3 in Mode 3 and during investigation to determine the source l 1o l3 l l of unidentified RCS leakage, charging and letdown were isolated at 2118 l lo l4 l [on September 29, 1983 by closing manual isolation valves S31208MUO84 l 1o l5 I l and S31208MUO91 in accordance with an approved Abnormal Valve Lineup. l lo ie l l The closing of these valves rendered Boronometer 3AE0203 inoperable. l lo l 7 l l There was no impact on Dublic health and safety (See also LER's83-071 l lo is i l and 83-073.) "

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[ z l@ l zl91919 I CAUSE DESCR,PTION AND CORRECTIVE ACTIONS h 1110 l l Boronometer inoperability was caused by an improper system lineup. The l l ili l l improper lineup was corrected at 0157 on September 30, 1983, restoring _

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s..o. so m ta e S AN C LEMEN T E. C A LIFORNI A 92672 h October 27, 1983 U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5368 Attention: Mr. J. B.' Martin, Regional Administrator

Subject:

Docket No. 50-362 30-Day Report Licensee Event Report No.83-078 San Onofre Nuclear Generating Station, Unit 3

References:

1) Letter, J. G. Haynes (SCE) to J. .B. Martin (NRC),

"14-Day Follow-Up Report, Licensee Event Report 83-073," dated October 17, 1983

2) Letter, J. G. Haynes (SCE) to J. B. Martin (NRC),

" Correction to 14-Day Follow-Up Report, Licensee Event Report 83-073," dated October 21, 1983 Pursuant to Section 6.9.1.13.b of Appendix A, Technical Specifications to Facility Operating License NPF-15 for San Onofre Unit 3, this submittal provides the required 30-day written report and a copy of the Licensee Event Report (LER) form for an occurrence involving Limiting Condition for Operation (LCO) 3.3.3.5 associated with the Remote Shutdown Instrumentation.

As described in the referenced letters, with Unit 3 in Mode 3 and during investigation.to determine the source of unidentified RCS leakage, charging and letdown were isolated at 2118 on September 29, 1983, by closing manual isolation valves S31208MUO84 and S31208MUO91 in accordance with an approved

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Abnormal Valve Lineup. The closing of these valves also rendered Boronometer 3AE0203 inoperable.

The improper lineup was corrected at 0157 on September 30, 1983, restoring the boronometer-to operable status. Cause.and corrective actions are described in LER 83-073, and include revision'to. procedures and training.

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, J. B. Martin October 27, 1983 If there are any questions regarding the above, please contact ,

me.

Sir.cer ely ,

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J. G. HAYNES STATION MANAGER

Enclosure:

LER No.83-078 cc: A.E. Chaffee (USNRC Resident Inspector, Units 1, 2 & 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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