ML19263C340

LER 79-008/03L-0 on 790126: LPCI Min Flow Value MO-2-1501-13A Failed to Close Completely During LPCI Pump Operability Surveillance.Cause of Failure Unknown

ML19263C340
Person / Time
Site:	Dresden
Issue date:	02/09/1979
From:	Achterberg J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A614	List: ML17173A613 ML19263C340
References
LER-79-008-03L, LER-79-8-3L, NUDOCS 7902220013
Download: ML19263C340 (1)

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/ 3 9 Lice .SEE CCDL 14 b LICE M MOEd CON *T 0 1 $fnN I b l@l 0l5l0l0l0l2l317l@ gl1l2l6l7l91@l0l2l019l7l9l@ M 69 LVENT OATE /4 75 HE"CRT D ATE BJ 8 00 61 DOC K ET NU*.'d E R EVENT DESCRIPTION AND FROCASLE CONSECUENCES h o12 During steady state operation, the LPCI system minimum flow valve MO-2-1501 -13A, l o 3 l f ailed to close completely while performing the LPCI pump operability surveL lance l o 6 .2 l (DOS 1500-6). The valve was closing when the breaker tripped. The valve autcmati- l ,

o ,Il cally closes when sufficient flow is sensed in the LPCI pump discharge header. l o c  ! Safety si",nificante was minimal since remaining 3 LPCI pumps were available to m?et i No previous similar occurrences. l oI7 l the required systen flow.

-u Ol3 l 60 7 8 9 C C '/ P Vgv E S Y 3 T E *.1 CAUOE CALSE 2005 CCD; SUSCCCE CC'/ PONE N T C0C E SUCCCOE SUSCCCE o 9 i SiPl@ IE O Exj@ Iz i zl zi zi zl zi@ l zl@ LzJ @ 12 13 18 I? 20 7 8 9 10 11 REVISMN SEQUE NTI AL O CCL '1 D E N CE REFORT EVENTvEAR R E POR T ?.0, CODE TYPE N O.

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@ REPORT l 7l 9l _l l0 l 0l 8l l/ l 0l 3l lL 3J l-l 31 0l 32 21 22 23 24 26 27 23 D ATT A CH*/ E N T P pn D-4 PR I'/ E CO '.*P. CC'/PO N E N T AC TI O '4 rUTUnE EFFECT EFurOC4 = " A%F ACTU RER TAAE. ACTlDN ONPLANT ^ ' E I'r S D POUPS " Su e '.1 TT E D FCPMdLi SU P P LI E R lJJx l@l zl@ L_zJ@ l zl@ l01010101 LNJ@ l 'il@ l zi@ l zi 91 91 91@ ,47 J, J3 36 31, 4J 41 42 43 44 CAUSE CESCRIPTION AND CCRRECTIVE ACTIO?

3 io l The cause of the failure is unknown. The valve operator motor and the thermal over- l

, , l load contacts were checked with no anomalies found. The breaker was reset and the (

While cycling,

, , j valve was successfully cycl-i three times from the control room. [

,;3 electrical maintenance checked the amperage of the motor and found it sa t is f ac tcrry. l l

No further corrective action is planned. l l

80 7 8 9 F ACILITY or METHOD CF

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