ML19319E540

AO 50-313/75-12:on 751229,svc Water Sys Valve CV-3821 to Decay Heat Cooler Failed to Automatically Open When Decay Heat Pump Started.Caused by Increase in Binding in Valve Packing or Seating Valve Hard Against Valve Seat

ML19319E540
Person / Time
Site:	Arkansas Nuclear
Issue date:	01/13/1976
From:	Rueter D ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19319E529	List: ML19319E528 ML19319E536 ML19319E540
References
NUDOCS 8004110803
Download: ML19319E540 (4)

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, 1. Abnormal Oc .rrence Report No. 50-313/75-12

2. Report Date: 1/13/76 3. Occurrence Date: 12/29/75 4 Facility: Arkansas Nuclear One-Unit.1 Russellville, Arkansas

5. Identification of Occurrence: '

Service Water System Valve to Decay Heat Cooler, CV-382,1, failed to open.

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6. Conditions Prior to Occurrence:

Steady-State Power Reactor Power 0 MWth llot Standby Net Output 0 Mwe Cold Shutdown X Percent of Full Power o 'f.

Refueling Shutdown Load Changes During Routine

, Power Operation l Routine Startup -

Operation Routine Shutdown Operation Other (specify) 3 i

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7. bescription of occurrence: ~;

At 1310 hours0.0152 days <br />0.364 hours <br />0.00217 weeks <br />4.98455e-4 months <br /> on December 29, 1975, the service water valve CV-3821 to j decay heat cooler taika t: :pe... automatically when decay hsat pump was started. The valve, however, opened manually. *

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March 4, 1975 NSP-10, Rev. 2 Page 2 of 4

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'N Abnormal Occurrence Report No. 50-313/75-12  :

8. Designation 'of Apparent Cause of Occurrence:

Design Procedure  !

I t Manufacture

• Unusual Service Condition .

including iinvironmental  !

Installation / I Construction Component Failurc Operator  !

, Other (specify) -X The cause was probably an increase in binding in the valve, packing or l seating the valve hard against the valve seat manually. ,

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9. Analysis'of Occurrence: ' '

• Since cooling water is not needed until transfer of the decay heat pump

to the reactor building sump during a LOCA, there was more than an adequate amount of time for the valve to be opened manually. This incident would not have affected the health and safety of th,e public.

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March 4, 1975 NSP-10, Rev. 2 Page 3 Of 4 i

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i. Abnormal. Occurrence Report No. 50-313'/75-12 i

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! 10. Corrective Action:  !

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4 A slight adjustment was made to the torque switch. j i . .

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11. Failuro Data:  ;

, None. -

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