ML20071F854

/03L-0 on 781014:Reactor Coolant Cold Leg Temp Indicator B/122C Failed High Off Scale Because of an Open Circuited Rosemount Model 104VC Rtd.The RTD Will Be Replaced During Present Refueling Outage

ML20071F854
Person / Time
Site:	Fort Calhoun
Issue date:	11/02/1978
From:	Connolley J, Gordon Peterson OMAHA PUBLIC POWER DISTRICT
To:
Shared Package
ML20071F851	List: ML20071F846 ML20071F854
References
LER-78-033-03L, LER-78-33-3L, NUDOCS 7811210371
Download: ML20071F854 (3)

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74 75 REPORT DATE 80 7 6 6C 61 GOCKET NUMBER EVENT OESCRIPTION AND PROBABLE CONSEQUENCES h toi2l l7aile in a het shutdown condition at the start of the 1978 refueline eutare, it was I i o ,3 , g noted that reactor coolant cold leg te=perature indicater 3/122C failed high eff scale 1 lo tal IThe re=aining cold leg temperature channels remained operable except for D cha=e1 I g y l (see LER 78-031). I l

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h

,, , o , lThe Rose =ount Model 10hVO RTD open circuited resulting in a high off scale reading en I

,,,,j gthe indicator. The RTD vill be replaced during the present rePaelite cutare. 1 I

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. Omaha Public Power District Fort Calhoun Station Unit No. 1

.IR 78-033 Docket No. 05000265 Attachment No. 1 Safety Analysis During the time "2" channel cold leg temperature indication failed the unit was in a hot shutdown condition, proceding to a refueling shut-down condition.

Tne remaining cold leg temperature channels re=ained operable except for "D" channel (see I2R 78-031) . The "D" channel had been placed in the tripped condition at the time of the "B" channel failure.

The RTD will be replaced duri=g the present refueling outage and all cold leg indications of this type vill be calibrated to verify operability.

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Omaha Public Power District Fort Calhoun Station Unit No. 1 IIR 78.-033 Docket No. 05000265 Attachment No. 2 Failure Data This is the third event of a Rosemount RTD failure (see also IIR's78-018 and 78-031). /

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