ML19317G016

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RO-76-15:on 761111,during Surveillance,Decay Heat Pump Suction Valve from Emergency Sump & Redundant Valve Failed to Open on Control Room Signal.Caused by Improperly Set Forque Limit Bypass Switches.Switches Reset
ML19317G016
Person / Time
Site: Rancho Seco
Issue date: 11/18/1976
From: Colombo R, Eisenhuth F
SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:
Shared Package
ML19317F939 List:
References
FOIA-79-149 NUDOCS 8002210716
Download: ML19317G016 (1)


Text

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LICENSEE EVENT REPORT k'

CONTROL DLOCK:l l 'l l l l

l (PLEASE PRINT ALL HEOUIRED INFORMATION) l..

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UCENSE NUMBER PE TY E '

ljj (c l A ln l s l S l 1l l 0l 0l-l0 l 0 l 0 l 0 l 0l_l0 l0 l l4l1l1l1l1l l 0l 1l 14 15 25 26 30 31 32 Il T7pf SE$

cAncoRY DOCKET NUMBER EVENT DATE REPORT oATE

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b7 58 59 60 61 so 69 74 75 80 L

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r.t':T DESCRIPTION

g j p,ille performini,. reillances, Decay Heat Pump suction valve from Emergency Sump l

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eo a failed to open on control room signal.

Redundant valve also failed to open. This g [i

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80 l i,; a repetitive occurrence, last report was RO 76-2.

Valves operated freely after l

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80

] l.anual activation.

(R0 76-15) j

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PnuE 80 t * *, ' t *.e CAUSE COMPUNENT COMPONENT

,. I t CODE COMPONENT CODE SUPPUER MANUFACTUF4R VOLATON

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  • e 10 11 12 17 43 44 47 48 N

C/ME DESCR!PTION

"7 l T.>rque limit switch bypass switches possibly set improperly, not allowing the valve l

~'[.itsetocleartheseat.

Switches reset, surveillance increased to once a week for a,80 l

80

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nth.

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NA A'ETH00 CF N $

% POWER OTHER STATUS DISCOVERY DISCOVERY DESCRPTION l

10 12 13 44 45 40 80 t'*.?r CON TENT

- W3y Of r,ELEASE l t

AMOUNT OF ACTIVITY LCCATION oF R'

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NA l

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3 10 11 44 45 "1!'.' EL EXPOSURES 60 "

    • '"i n TYPE DECCRIPTION

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NA l

11 12 13 80

  • ".Et. INJUAIES OESCR!pTtON O

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CONSEQUENCES M ("pn to None l

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00 I.ocal neuspapers notified 11/22/76 l

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e 22919urveillance is acceptable, continue monthly surveillance progran j

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{ {ainder of core cycle one.

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R_ a' Colenbo/F.T.-Elsenhuth M WWl

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