ML20010C481

LER 81-047/03L-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

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: ML20010C476 ML20010C481
References
LER-81-047-03L, LER-81-47-3L, NUDOCS 8108200122
Download: ML20010C481 (2)

Text

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, LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l l l (PLEASE PRINT OR TYPE ALL REQUt*1ED INFORMATION) 1 6 l0 l i l l F l L l C l R l P l 3 lgl 0 l 0 l- l 0 l 0 l 0 l 0 l 0 l -l 250l 026 lg4lLICENSE l j 1lTYPE 1l JO 1[gl6 7 CAl T 58lg 8 9 LICENSEE CCDE 14 15 LICENSE NUMBEH NT lol1]

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74 75 REPORT DATE

? 60 61 DOCKET NUMBER 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 y g g 3,  ; decay heat pump discharge throttle valve DlIV-110 would not control flow in automatic. l

[gg,; )This created an event contrary to T.S.3.5.2. Maintenance was initiated. cnd operabilit31 yg,3y ,was restored at 1753. Redundancy was provided by ES subsystem "B". There was no l ggggy jeffect upon the health or safety of the general puLlic. This is the eighth occurrence l lgl7g g for DHV-110,and this is the sixteenth event reported under ths Specification. l l 0la I l ,,

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J4 3d 3/ 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l3 lollThe cause of this event is attributed to a stuck switch in the flow control instrument.l

[igil lThe switch was lubricated, exercised and the functional test was satisfactory. An ]

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

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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 L

'1753 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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