ML20071G238

LER#78-031/03X-1 on 780918:during Refueling Outage,D Channel Hot Leg Temp Indication Was Investigated to Determine Cause of 780918 Failure.Failure Caused by Rosemount Model 104VC RTD Having Water in the Pothead

ML20071G238
Person / Time
Site:	Fort Calhoun
Issue date:	12/21/1978
From:	Connolley J, Gordon Peterson OMAHA PUBLIC POWER DISTRICT
To:
Shared Package
ML20071G236	List: ML20071G230 ML20071G238
References
LER-78-031-03X, LER-78-31-3X, NUDOCS 7812270224
Download: ML20071G238 (3)

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NRC P C.M ~ 6 Up3A Z 3EpC3T.p337*0US RE?CET DAS 10/11/78 U.S. NUCLEA2 KE!ULATOM COMMIS3!!N is 773 LICENSEE EVENT REPORT CONTROL 8LCCC l l l l I l lh 6

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,, EVENT DESCRIPT!CN AND PRCSA8LE CONSECUENCES 1o 6:l lDu ing the 1978 Refueling Outage, "D channel het leg te=eerature indication was I t o i a 6 l further investigated to deter =ine the cause of failure on Septe=ber Q,1978 (see  ;

i o 4 .i ; ILER 78-o31). The te=perature RTD pothead was founf. W*.h water in it and is the p'r:b- t io.5; Iable cause of failure. I l

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( I f . . i"I t 80 7 8 9 yA(yt SYSTE*A CAUSE CAU$E OCMP.

CCCE CO E SUSCCCE COMPCNENT COCE SUSCO:E $UeC0ct toist I il A lh {,,[,jh l A lh l Il NI S! Tl El Ulh [E_jh W h 13 12 13 14 19 10 7 8 9 11 SECUENTIAL CCOUR RENCE REDCRT REVt$1CN gvf NT vfA m mESCmT NC. CODE TvPE No.

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,,. 71 22 23 2 ;6 27 28 ;3 40 31 22 E8PECT ATTACM9ENT NPMO PmlME COMP, C0%4PCNENT ACTICN .FUTVmt SMtJTOOWN 80RM byg. MANUFACTURER TAKEN ACTICN CN FLANT METMCD MOURS . SusulTYED $UPSU ER W@[.;,,,J@ W@ [J.,J@ lo lo lo lo I (,y_j @ IN l@ l42 Ul@ l El 3l 71 .g u a u . a 2_ .i 2 - .7 CAUSE DESCRIPTION AND CORRECTIVE AC 1CNS Iii;IlThe Ecse==unt Model loh7C RTD failed frem vater being in the pcthead. All het les I i,i.3 l R'"D's were calibrated and their pcthead covers vere checked and tichtiv elesei durirr i D 1the 1978 Re'ueling Outage. I l

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U?"A3 RIPo?.T-??rIIoUS P2? ORT DATI 10/2/78 LIR 78-031 Revisica 1 Oratha Public Power District Fort Calhoun Station Unit No. 1 Dock:t No. 05000285 Attachment No. 1 Safety Analysis The plant instrument system is so designed that no single failure can

. prevent the safe shutd own of the plant if required. During the time the "D" channel hot leg RTD was inoperable, the remaining hot leg temperature indications were operable.

All hot leg RTD's vill continue to be checked by visual inspection., a

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1 UFDATI RFPORT-PR " IICUS REPORT DATE 10/11/78

• IR 78-031 Revision 1 0:naha P.iclic Power District i Fort Calhoun Station Unit No. 1 Dochet No. 05000265 4

• Attachment No. 2 I

Failure Data This is the first failure resulting from water in the ;othead at the

- Fort Calhoun Station Unit No. 1.

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