ML18078A227

LER#78-062/03L-0 on 780913:during Normal Oper the #12 Reactor Coolant Flow Channel 2 Was Not Indicating Due to Failure of a Hagan Controls Signal Isolator

ML18078A227
Person / Time
Site:	Salem
Issue date:	10/03/1978
From:	Kapple A Public Service Enterprise Group
To:
Shared Package
ML18078A226	List: ML18078A225 ML18078A227
References
LER-78-062-03L, LER-78-62-3L, NUDOCS 7810100033
Download: ML18078A227 (3)

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' Report Number: 78-62/03L Report Date: 10/3/78 Occurrence Date: 9/13/78 Facility: Salem Generating Station Public Service Electric & Gas Company Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

No. 12 Reactor Coolant Flow Channel 2 Inoperable CONDITIONS PRIOR TO OCCURRENCE:

Operational Mode 1, Reactor Power 100%

DESCRIPTION OF OCCURRENCE:

At 1100 hours0.0127 days <br />0.306 hours <br />0.00182 weeks <br />4.1855e-4 months <br />, the Control Room Operator observed a loss of indication on Channel 2 Reactor Coolant Flow. A routinely scheduled channel functional test which does not check flow indication had been satis-factorily completed at 1027 hours0.0119 days <br />0.285 hours <br />0.0017 weeks <br />3.907735e-4 months <br />. Performance Department was notified and Action Statement No. 7 for Technical Specification 3.3.1.1.1 was implemented. At 1230 hours0.0142 days <br />0.342 hours <br />0.00203 weeks <br />4.68015e-4 months <br />, repairs had been completed and the channel was returned to service.. The Action Statement was terminated. All redundant channels were available during this occurrence.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

The cause of this occurrence was loss of output from the signal isolator which supplies flow indication. The cause of the signal isolator failure is under investigation and is being follow~d on O.I. 752.

ANALYSIS OF OCCURRENCE:

Technical Specification 3.3.1.1.1 Action Statement No. 7 states that with the number of operational channels one less than the total number of channels, startup and/or power operation may proceed until perform-ance of the next required channel functional test provided the operational channel is placed in the tripped condition within one hour*~-

No. 12 RC Flow Channel 2 was placed in the tripped condition and re-mained tripped until the channel was declared operational.

• -.- .... ~E~ 78-62/03L CORRECTIVE ACTION:

The failed signal isolator was replaced with a unit taken from spares.

The spare isolator was bench tested prior to installation into the protective system. Flow indication was compared with other channels and found satisfactory. The failed signal isolator is under investigation.

FAILURE DATA:

Signal Isolator Model 110 Manufacturer: Westinghouse Electric Corporation Hagan/Computer. System Division Prepared by~~A_.~w~*-K~a_p_p_l_e~--------  ;/7*2 ~.--~-..

Manager - Salem Generating Static SORC Meeting No. 58-78

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!PLEASE PRINT OR Tv.1.1. REQUIRED INFOAMATIONI

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i:I:IrJ I During normal operation, at 1100 hours0.0127 days <br />0.306 hours <br />0.00182 weeks <br />4.1855e-4 months <br />, the Reactor Operator noticed

((I!] I No. 12 Reactor Coolant Flow Channel 2 was not indicating. T/S 3.3.1.1.~

[7i]7J Action Statement 7 was implemented. Performance Department placed the

[)))) I channel in the tripped condition and repaired. All redundant channels

-[TI[} were operational. At 123 0 hours0 days <br />0 hours <br />0 weeks <br />0 months <br />, #12 RC Flow Ch 2 was declared opera-

! []JI] I tional and the Action Statement was terminated. This is the sixth

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44 47 4J CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS @

o:::I§] I The cause of this occurrence was failure of a Hagan Controls Signal IIID Isolator. The cause of the isolator failure is under investigation.

o:JJJ I The signal isolator was replaced and an.operational test confirmed OJI] I operability.

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FA.Cl L.l'TY STAT!JS '4 P<lWER OTHER STATUS '..:.:::;

METHOO OF DISCOVERY .01scove~Y OESC~IP'TlON IJJI] L!J@ I l I o I o l@I N/A I W! O~erator Action .*

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W@I 10 11 AMOUNT OF AC'TlVITY N/A

.. 45 l.OCAT10N OF REl.EASc N~A 80 PERSONNEi. EXPOSURES ~

NUM8SR ~TYPE (.;;;'\ OSSCRIPTlON ITII! I o I o I a* lW~..,..___N_./_A_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ___.

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NUMBER

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OESCl"IPTION 10

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NAMEOFP'REPARER _________ A__*__w_.___K_a~p~p_l_e____~----- PHONE: (609)365-7000 Salen Ext.~

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