ML19095A639

LER 1976-002-00 for Surry Unit 1 Failure of Auxiliary Feedpump Discharge Valve MOV-FW-151A to Open When Main Feedpump Breakers Were Opened

ML19095A639
Person / Time
Site:	Surry
Issue date:	04/15/1976
From:	Stallings C Virginia Electric & Power Co (VEPCO)
To:	Moseley N NRC/IE, NRC/RGN-II
References
LER 1976-002-00
Download: ML19095A639 (3)

Text

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Dear Mr'/Mos~+ey(.:

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i-- e LICENSEE EVENT R~~ORT .

CONTROL BLOCK: I I I I *I I I

• clAsE PRINT ALL REau1REo 1NF0RMATIDNJ 1 6 LICENSEE LICENSE *

• EVENT NAME LICENSE NUMBER TYPE TYPE

@I2JlvlAlslPI 7 8 9 sl 1411 15Io Io 1-1 oI oI oI oI ol-1 o I o25I l411l1l1lol 26 30 lo31 '332I REPORT REPORT CATEGORY TYPE. SOURCE DOCKET NUMBER EVENT DATE REPORT DATE 7

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IP Io I 57 58 w 59 lkJ 60 l.Qlslol~lol2l sl o! lol311lsl1IGI I o I 4 I 1 I 3 !1 I6 I 61 68 69 74 75 80 EVENT DESCRIPTION

. 7 lol2!8 9I With the unit shutdown, Auxiliary Feedpump Discharge Valve MOV-FW..:151A failed to 80 10131 I open when the main feedpump breakers were opened. This is in violation of Technical I 7 8 9 80 lol41 I Specification 3.6. The redundant valve opened satisfactorily. A similar event I 7 8 9 80

@:@] I occurred on 12-11-75 and is described in AO-Sl-75-28. I 7 8 9 80 7

&rill8 9 80 PRIME SYSTEM CAUSE COMPONENT COMPONENT CODE CODE COMPONENT CODE SUPPLIER MANUFACTURER VIOLATION 7

@0 8

I cl HI 9 10 w 11 IR I E IL IA I y IX I 12 17 w 43 I Ai 1 ! 0 ! 9 I 44 47 LY.J 48 CAUSE DESCRIPTION

~ I An investigation *revealed that the *,ralve- malfunction was caused by the timing relay I 7 8 9 80

@:{fil I which is a oart of the control circuit. The relay plunger failed to activate a micro I 7 8 9 80

[I@J I switch ne~essary for the valve opening operation. The timing relay/micro switch(Cont 1 d~

7 8 9 80 FACliJTY METHOD OF STATUS  % POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION EE] ~ lo Io Io I IN/A lAJ IN/A

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7 8 9 10 12 13 44 45 46 80 FORM OF ACTIVITY CONTENT rn w RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE N/A N/A 7 8 9 10 11 44 45 BO PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION IIel8 9lo lo I oJ11 I12zl 13.___;;N;.;.i. .; .A;. ___________________________

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___J 80 PERS-ONNEL INJURIES NUMBER .DESCRIPTION EE)8 7

I OIO 9

IO 11I 1I *N/A '::::2~'-'=-----*-------------------------------8..JO OFFSITE CONSEQUENCES

~ NA 7 8 9 BO LOSS OR DAMAGE TO FACILITY TYPE DESCRIPTION

~.8 9~ 10~N=/-"'A'---~~~~~~~~~~~~~~~~~~~~~~~~~~~------'

7 80 PUBLICITY E08 9I NIA 7 80 ADDITIONAL FACTORS

~ I The health and safety of the public were not affected by this occurrence because the I 7 8 9 80

~ I redundant valve opened, as did all of the other similar valves.

7 8 9 80 N A M E = - - - - - - - - - - - - - - - - - - - - - - - PHONE: _ _ _ _ _ _ __

GPO eai. 667

CAUSE DESCRIPTION (CONTJNUED)

• assembly was remov~d and bench tested. The plastic plunger was binding with the plunger guide plate. After positioning the guide plate properly and lubricating it, the relay operated satisfactorily 50 times during 50 tests. A replacement timing relay/micro switch assembly was obtained from inventory. The same problem was initially found. Corrective adjustments were made, bench testing was satisfactorily completed, and this assembly installed in the circuit. The valvewas returned to service following operational testing. Since the valve is normally open during power operation and all other valves operated properly, it is felt that no further corrective.

action is required at this time. However, plunger action will be verified monthly until such a time that the cause of plunger binding can be isolated and corrected.

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