ML19095A618

Submit Reportable Occurrence No. AO-S1-75-21 Update Re Safety Injection Master Relay Failed to Latch When Performance Test 18.2 Was Being Performed on One Train

ML19095A618
Person / Time
Site:	Surry
Issue date:	06/16/1976
From:	Stallings C Virginia Electric & Power Co (VEPCO)
To:	Moseley N NRC/RGN-II
References
Serial No. 089 LER 1975-021-01
Download: ML19095A618 (3)

Text

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V{iioi'~:i:i EL:tlci'rRIO AND, ?~WER. GoMPA~

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• *nocket No .. 50-280

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. De~r 11r.* Moseley: *

. . . .. Pursuant to. Surty -Pciwer. Statioli*: Tethnical {ipe.¢:if:1.cki.tton 6~ 6~2 ~- the Virginia Electric_ and. Power 'Conipany'.'hereby: subpiit"s a'copy *of Reportabh** 0CCUt".~

rerice. No. AQ-s*!....75-21 .update.'*: .. ..

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• Safety and Operating GommittJe *and* wii-t be**

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on ,the agenda.* for the next*. .

meeting of the *system_ 'Nuclear *saf e~y *and .operating Gorimittee. .. * .

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UPDATE REPORT - AO-S1-75-21

-LICENSEE EVENT REPORT. Previous Report Date 10/07 /75 CONTROL BLOCK: I I I I I I I [PLEASE PRINT ALL REOUIRC:D INFORMATIO!'.!)

1 6 LICENSEE

• LICENSE EVENT NAME LICENSE NUMBER TYPE TYPE 7

@EllvlA!slP!sl 8 9 11 15 14 Io Io 1-1 oI oI oI oI o1-1 o.k-1 25 l411l1l1lol 26 30 lo31 I 321I REPORT REPORT CATEGORY TYPE SOURCE DOCKET NUMBER EVENT DATE REPORT DATE

@E]coN'T I DI I I l_QJ UJ Io I s I o I - I o! 2 I s I oI lol912!sl1lsl I o I 6 I 1 l 4! 1 I 680I 7 8 57 58 59 60 ITT 68 69 74 75 EVENT DESCRIPTION

@:@] !With the Unit at refueling shutdown, a safety injection master relay failed to latch I 7 8 9 80

@El !when Performance Test 18.2 was being performed on one train. This is in violation of I 7 8 9 BO ioj4j I Technical Specification 3o3o The redundant train operated correctly. Therefore, the J 7 8 9 80

~ I requirement of the safety injection system would have been fulfilled, (AO-S1-75-21). I 7 8 9 80

[Q:@J 7 8 8 PRIME 80 SYSTEM CAUSE COMPONENT COMPONENT CODE CODE COMPONENT CODE SUPPLIER MANUFACTURER VIOLATION

@j 7

LiliJ W 8 9 10 11 IR IE IL I Al YI 12 xj 17 lBJ 43 lw!1.l2lol 44 47 LYJ 48 CAUSE DESCRIPTION

~ !An investigation revealed that the mechanical latch assembly was not functioning pro- I 7 8 9 80 rn 7 8 9 lperlyo The latch adjustment screw was adjusted in accordance with the m~nufacturer's I 80 7

j1jDI iinstruction 8 9 manual, aI1d th(: relay perfo1'."me.d satisfacto:i;illi The relay was (Can't.)

nn uu I

FACILITY METHOD OF

% POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION w

STATUS EE] L!!J Io Io I oI N/A ' -N/A

--'----------*_J 7 8 9 10 12 13 44 45 46 BO FORM OF ACTIVITY COi\JTENT rn w RELEASED OF FIELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 7 8 9

~J 10 I N/A 11 44 45 80 J

PERSONNEL EXPOSURES NUMBER TYPE OESCRIPTJON l2E] l_cW)j__QJ ~ l N/A 7 8 9 11 12 13 BO PERSONNEL lNJURiES rn 7 8 9 lo NUMBER IO I Q_j 11 DESCRIPTION L N/A,_ __

12 80 OFFSITE CONSEQUENCES rn 7 8 9 i N/A 80 LOSS OR DAMAGE TO FACILITY 7

rn~, w 8 9 TYPE DESCRIPTION IN/A 10'---'----*-------------------*------------------- _J 80 PUBLICITY 7

(I08 l 9

N/A - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - _ 80 j ADDITIONAL FACTORS

~ IThe health a~1d safety of the public were not affected by this occurrence because the _I 7 8 9 00 E§J L~unction of safety injection would have been fulfilled had it been necessary. ____J 7 8 9 80 NAME: E~ M. Sweeney, Jre PHONE:{804) 357-3184 ~--

GPO 081- G6"/

CAUSE DESCRIPTION (CONTINUED)

,r manufactured by Westinghouse Ek:ctric Corporation, Type MG-6 Auxiliary Relay, Style 1163828.

Presently, several relays of this type are being utilized as* follows:

SIA-A,B Safety Injection Master Relay, initiates all safety injection outputs SIB1-A, B Supplies input for pressurizer low pressure-permissive to block and unblock safety injection.

SIB2-A,B Supplies input for low Tave permissive to block and unblock safety injection.

Fl-A,B Initiates feedwater isolation on safety injection or steam generator F2-A,B high level.

F3-A,B 3-VS-103A,B Controls motor operated valves for Control Room ventilation isolation

• VS-F-15 .Control Room ventilation supply fan circuit.

A relay of this type failed on September 28, 1975, and was reported in Abnormal Occurrence Report AO-S1- 7 5-20 *. Relay VS-103A failed in the energized position during a Performance Test and MOV-VS-103A did not close as required. Had this happened during accident conditions, the venti.lation supply fan could have been de-energized and this supply path valve manually closed, thus providing control room isolation.

Failures of this type of relay have been rare and the consequences of these failures have been insignificant since the other train provides redundancy where required. No long term correctivG action is deemed necessary at this time.