ML19312D219

LER 80-011/03L-0:on 800219,during Surveillance Test,Trip Occurred on Standby Gas Treatment Sys 1.Caused by Cracked Flow Sensing Line Which Was Probably Stepped On.Line Replaced

ML19312D219
Person / Time
Site:	Oyster Creek
Issue date:	03/17/1980
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19312D218	List: ML19312D217 ML19312D219
References
LER-80-011-03L, LER-80-11-3L, NUDOCS 8003210552
Download: ML19312D219 (3)

Text

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EVENT DESCRIPTION AND PROSAsLE CONSEQUENCES h E [., On February 19, 1980 during a scheduled surveillance test on the Stand- l ,

EI by Gas Treatment System (SGTS), a trip was experienced on SGTS No. 1.  ; ,

I SGTS No. 2 started automatically and performed satisfactorily. An in-EI l i

@i 'vestigation revealed that the absence of a system flow s'Ignal was the 9 cause of the SGTS No. I shutdown. This event is considered a reportable ',

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44 o CAUSE DEscalPTION AND CORRECTIVE ACTIONS h El The cause of this occurrence is attributen to a erneked finw sensinn I i

EI line (tygon tubing) causing an erroneous system flow sional. The sens I

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gi Ing line is considered to have failed as a result of having been stepped l l gl on. The defective flow sensir:g line was replaced. The plant engineer- l l

gg Ing staff will determine what can be kne to prevent recurrence. I ae so RY STA  % POWER OTHER STATUS DIS DISCOVERY DESCRI' TION h y W @ l0l0l0l@l NA l lBl@! Surveillance Test l s 4,,, g u n 4. o as oc RECEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE "A I l NA l E. L. EJ @ LzJ@l

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n A. Ross Lc8;- R7RL NAME OF PRE *ARER PHONE:

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' (f pj Jersey Central Power & Ught Company Madison Avenue at Punen Bow! Road Monistown. New Jersey 07960 f

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5 (201)455-8200 OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 i i

Licensee Event Report Reportable Occurrence No. 50-219/80-11/3L j s

Report Date $

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Harch 17, 1980 1

Occurrence Date February 19, 1980 ]

Identification of Occurrence Stapdby Gas Treatment System #1 was found to be inoperable during a scheduled surveillance test. . ,

This event is considered to be a reportable occurrence as defined in the Techni-cal Specifications, paragraph 6.9.2.B.2.

Conditions Prior to Occurrence The plant was shutdown for a refueling / maintenance outage.

• The reactor. mode switch was locked in_ refuel. l The reactor cavity was flooded and less than 212*F. l Description of Occurrence On Tuesday, February 19, 1980, at approximately 2130 hours0.0247 days <br />0.592 hours <br />0.00352 weeks <br />8.10465e-4 months <br />, during a scheduled surveillance of the Standby Gas Treatment System (SGTS), a trip was experienced on SGTS #1 and automatic circuitry started SGTS #2 which performed satisfactority.

A s'ubsequent investigation ~-revealed that the absence of a system flow signal resulted in a shutdown of SGTS #1.

Apparent Cause of Occurrence The cause of the occurrence was due to a cracked flow sensing line (tygon tubing) which provided an erroneous signal to the system control circuitry indicating no system flow. The sensing line is considered to have failed as a result of being

~ stepped on by station personnel.

P Jersey Central Power & Lght Company is a Member of the Genera: Pubic Utames System I l .

R:porttblo Occurrcnco'No.- 50-219/80-11/3L. Pcg2 2

, March 17. 1980 Analysis of-Occurrence  !

i Standby Gas Treatment' System'Is used to process the reactor building atmosphere,  !

should conditions be present which require its functioning, and exhaust it through- l

.the plant-stack. Although_SGTS #1 was observed to be Inoperable when the system i was initiated, the control; logic did, as designed, initiate SGTS #2 which proved

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l to be functional.- The safety significance of this event is considered minimal  ;

since the only concern was a loss of redundancy in the SGTS's. ,

s Corrective Action SGTS #1 was removed from service and the defective flow sensing line was replaced.

An operability test was performed.to prove the system operable. The plant engi-

-'neering staff will evaluate the' current design of the SGTS flow-sensing line to

. prevent a recurrence of this type.

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