05000302/LER-1981-047-03, /03L-0:on 810715,during Performance of SP-340,ECCS Pump Operability,Decay Heat Pump Discharge Throttle Valve DHV-110 Would Not Control Flow in Automatic.Caused by Stuck Switch in Flow Control Instrument.Switch Lubricated

/03L-0:on 810715,during Performance of SP-340,ECCS Pump Operability,Decay Heat Pump Discharge Throttle Valve DHV-110 Would Not Control Flow in Automatic.Caused by Stuck Switch in Flow Control Instrument.Switch Lubricated

ML20010C481
Person / Time
Site:	Crystal River
Issue date:	08/12/1981
From:	Charles Brown FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010C477	List: 05000302/LER-1981-047, Forwards LER 81-047/03L-0 05000302/LER-1981-047-03, /03L-0:on 810715,during Performance of SP-340,ECCS Pump Operability,Decay Heat Pump Discharge Throttle Valve DHV-110 Would Not Control Flow in Automatic.Caused by Stuck Switch in Flow Control Instrument.Switch Lubricated
References
LER-81-047-03L, LER-81-47-3L, NUDOCS 8108200122
Download: ML20010C481 (2)

LER-1981-047, /03L-0:on 810715,during Performance of SP-340,ECCS Pump Operability,Decay Heat Pump Discharge Throttle Valve DHV-110 Would Not Control Flow in Automatic.Caused by Stuck Switch in Flow Control Instrument.Switch Lubricated

Event date:
Report date:
3021981047R03 - NRC Website

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h j O l 2 I l At 0520 during performance of SP-340, ECCS Pump Operability, it was discovered that l

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Maintenance was initiated. cnd operabilit31 yg,3y,was restored at 1753. Redundancy was provided by ES subsystem "B".

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SUPPIDENTARY IIEGMATICN Report #50-302/81-047/03IA in Facility:' Crystal River Unit 3 m*

Report Date: August 12, 1981 Occurrence Date:-

. July 15,1981 Identification'of Occurrence:-

Decay Heat Pump discharge throttle valve would not control flow: in automatic contrary _to Technical Specification 3 5 2.

Conditions Prior.to Occurrence:

Mode 1 - Power' Operation-(39%)

' Description _of Occurrence:

At 0520 during performance of SP-340, ECCS Pump Operability, it 'was discovered that decay heat pump discharge _- throttle i=

valve DHV-110 would not control flow ~in automatic.

Maintenance was initiated,~ and operability---was restored at

'1753 L

Designation cf Apparent Cause:

The cause of this event is attributed to a stuck swit91 in-the flow control instrument.

Analysis of Occurrence:

)

Redundancy was provided by ES Subsystem "B".

There was no effect upon the health or. safety of the general public.

Corrective Action

The: switch was lubricated, exercised and the functional test

- was satisfactory. ' An engineering evaluation (REI-80-9-3) of -

the control system for DhT-110.and DHV-111.is currently in progress.

Failure Data:

This is the eighth occurrence for DhT-1.10, and this is the Leixteenth event reported under.this Specification.

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