ML19332B293

LER 80-037/03L-0:on 800819 During Standby Gas Treatment Sys SGTS Surveillance Testing,Sgts 2 Tripped.Caused by Misaligned Welding Lead Run Across Tubing Below Duct.Welding Lead Realigned & Functionally Tested

ML19332B293
Person / Time
Site:	Oyster Creek
Issue date:	09/18/1980
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19332B290	List: ML19332B289 ML19332B293
References
LER-80-037-03L, LER-80-37-3L, NUDOCS 8009260447
Download: ML19332B293 (3)

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I0i:!l On August 19, 1980, the Standly Gas Treatment System (SGTS) was operated i o ,2 ! l in a degraded mode as allowed by T.S. 3.5.B.3.A. During routine sur-  !

[>i4 i I veillance testing SGTS #2 initiated normally b2t subsequently tricoed i Ioi5i , out. _

SGTS #1 immediately initiated automatically and performed satis- l I c ie a ' factorily. An investigation revealed that oressure sensor pN-4 was not i I:i: i sensing flow oronerly due to misalignment apoarentiv caused by a welding I

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. kt ; ( ] Madison Avenue at Punch Bowl Road Mornstown, New Jersey 07960 (201)455-8200 OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/80-37/3L Report Date September 18, 1980 Occurence Date August 19, 1980 Identification of Occurrence Operation of the Standby Gas Treatment System in a degraded mode as allowed by Technical Specifications, Paragraph 3.5.B.3.A when Standby Gas Treatment System

1. 2 was found to be inoperable during a scheduled surveillance test.

This event is considered to be a reportable occurence as defined in the Technical Specifications, paragraph 6.9.2.b.2.

Conditions Prior To Occurrence The plant was operating at steady state power.

Plant parameters at the time of occurrence were Power: Reactor, 1717 MWt Generator, 558 NWe Flow: Recirculation 13.7 X 104 gpm Feedwater 6.32 X 106 lb/hr Description of Occurrence On Tuesday, August 19, 1980, at approximately 1830 hours0.0212 days <br />0.508 hours <br />0.00303 weeks <br />6.96315e-4 months <br />, during routine surveill-ance testing of the Standby Gas Treatment System, SGTS #2 initiated normally but subsequently tripped out. SGTS #1 immediately initiated automatically and per-formed satisfactorily.

Jersey Central Power & Light Company is a Member of the General Pubke Utst:es System

e Reportable Occurrence No. 50-219/80-37/3L September 18, 1980 Page 2 Apparent Cause of Occurrence The cause of the occurrence is attributed to personnel error. Pressure Sensor PN-4 was not sensing flow properly due to misalignment apparently caused by a welding lead that was inadvertently run across the tubing below the duct.

Analysis of Occurrence The Standby Gas Treatment System is used to process the Reactor Building atmo-sphere, should conditions be present which require its functioning, and exhaust it through the plant stack. Although SGTS #2 was observed to be inoperable when the system was initiated, the control logic did, as C3 signed, initiate SGTS #1 which proved to be functional. The safety significance of this event is considered minimal since the only concern was a loss of redundancy in the SGTS.

Corrective Action The welding lead was removed from the tubing and the PN-4 sensing element was aligned properly to sense flow. An operability test was performed to prove the system functional. A memorandum will be issued to the appropriate maintenance personnel stressing the need for tighter supervisory and administrative controls when working around safety related equipment.

Failure Data Not applicable.

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