ML19284A699

LER 79-014/03L-0 on 790220:decay Heat Cooler 3A Outlet Remote Shutdown Temp Indicator Inaccurate & Rendered Inoperable.Caused by Failed Resistance Temp Detector (Rtd). RTD Replaced & Sys Recalibr

ML19284A699
Person / Time
Site:	Crystal River
Issue date:	03/01/1979
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19284A698	List: ML19284A697 ML19284A699
References
LER-79-014-03L, LER-79-14-3L, NUDOCS 7903150214
Download: ML19284A699 (2)

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74 DE*Omf G Af t Ba EVENT DESCRIPTION AND PROSA8LE CONSEQUENCES p y g lAt 0330 while performing Operat ng Daily Surveillance, SP-300, it was  ;

, , , , determined that DH-39-TT, Decay Heat Cooler 3A outlet remote shutdown j g , temperature indicator was inaccurate and was rendered inoperable. This_ g-ITTU ! event is contrary to Technical Specification 3.3.3.5. Entered action 1 ITTO l statement a . Further invoerig,rinn en"n,1oA eh,* DTT1 W 9-TF b,A #,41oA I a;, gNo effect upon public health and safety as DH-2-TE provides indication onlyi Redundant instrumentation

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g ;The cAUse causeOEsCRiericN of this event is AND attri CORRECnve ACricss The @ RTDbuted was replacec) to a fa

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,on 23 February 1979 at 0830. No further corrective action required. ,

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,, e SUPPLEMENTARY INFORMATION Report No.: 50-302/79-014/03L-0 Facility: Crystal River Unit #3 Report Date: 1 March 1979 Occurrence Date: 20 February 1979 Identification of Occurrence:

One remote shutdown instrumentation channel inoperable contrary to Technical Specification 3.3.3.5.

Conditions Prior to Occurrence:

Mode 1 power operation (98%)

Description of Occurrence:

At 0330, while performing daily Operating Surveillance (SP-300) it was determined that DH-39-TT, Decay Heat Cooler 3A outlet remote shutdown temperature indicator, was inaccurate as com-pared to the idle 3A cooler inlet temperature. Further investi-gation revealed that RTD DH-2-TE had failed. Maintenance restored indicator operability on 23 February 1979 at 0830 following RTD replacement.

Designation of Apparent Cause:

The cause of this event is attributed to a failed RTD, DH-2-TE Analysis of Occurrence:

No effect upon public health and safety as DH-2-TE provides indication only and does not affect decay heat cooling capability.

Corrective Action:

The RTD was replaced, the system was recalibrated and the indicator (DH-39-II) was returned to service. No further corrective action required.

Failure Data:

First occurrence of an event reported under this Technical Specification.

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