05000293/LER-1981-008-03, /03L-0:on 810313,inboard Isolation Valve Mo 2301-5 Was Determined to Be Inoperable.Caused by Manual Operation Disengagement Spring in Limitorque Operator Being Broken & Imbedded in Operator Gear Teeth,Jamming Gears

/03L-0:on 810313,inboard Isolation Valve Mo 2301-5 Was Determined to Be Inoperable.Caused by Manual Operation Disengagement Spring in Limitorque Operator Being Broken & Imbedded in Operator Gear Teeth,Jamming Gears

ML20003G196
Person / Time
Site:	Pilgrim
Issue date:	04/09/1981
From:	Mcloughlin M BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20003G194	List: 05000293/LER-1981-008, Forwards LER 81-008/03L-0 05000293/LER-1981-008-03, /03L-0:on 810313,inboard Isolation Valve Mo 2301-5 Was Determined to Be Inoperable.Caused by Manual Operation Disengagement Spring in Limitorque Operator Being Broken & Imbedded in Operator Gear Teeth,Jamming Gears
References
LER-81-008-03L, LER-81-8-3L, NUDOCS 8104280457
Download: ML20003G196 (1)

LER-1981-008, /03L-0:on 810313,inboard Isolation Valve Mo 2301-5 Was Determined to Be Inoperable.Caused by Manual Operation Disengagement Spring in Limitorque Operator Being Broken & Imbedded in Operator Gear Teeth,Jamming Gears

Event date:
Report date:
2931981008R03 - NRC Website

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U. S N;C L E 3 R E GU u.T O R Y CM/ " S m

' R;C F OHPA E LICENSEE EVENT REPORT c.ONTROL BLOC 0 l l

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l l lh (PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATION) i e

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8 9 LICENSEE CODE 14 15 uCENSE NUMSER 25 26 LICENSE t ypE Jo 57 CAT sa l0l11 3[R] lL )@l 0 l 5 l 0 l - l 0 l 2 l 9 l 3 j@l 0 l 311 l 318 l 1]@l 014 l Ol 91 8l l j@

CON T 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 8

EVENT DESCRIPTION AND PROSABLE CONSEQUENCES h 10 !: 1 lOn March 13, 1981, while performing a surveillance test on the HPCI system, its in-i The valves 250 volti [O 33l board isolation valve MO 2301-5 was determined to be inoperable.

f o I.i J lDC breaker, D951, tripped with the valve in the closed position.

The HCPI system was}

Lo I s l i eci red in perable, and a required surveillance initiated and a priori ty ' A' min t-1 d

10 l 3 ) lenance request issued.

Investication revealed that n rechnnieni cnrnonent fai l ure 1

electrical breaker.

The j [o J 7 J ljammed the operator resulting in the trippinc of the valve" l o l a i Pperator was repaired and the unit returned to service on March 19. 1981.

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10 11 12 13 18 19 20 SE QU E N TI A L OCCURAENCE REPORT REVt% ON

_EVENTYEAR REPORT NO.

COOE TYPE NO.

h,ay'RO l811 j l-l l 010181 M

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21 22 23 24 26 27 28 29 30 31 32 TAKEN A C

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33 J4 JS 36 al 40 el 42 43 44 47 CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS l i t a l [nvestigation revealed that a manual operation disengagement spring in the 250 V 'DC' l 1i 11 j lLimitorque operator broke and imbedded in the onoratnr's m.n r enneh jnn t e6 pc l This resulted in overdriving the motor and burning it out.

The operator was rebuilt l

,,, jg

,,,,j gtested and returned to service.

The manufacturer was consulted and the review of I

g,g,,; gthis event indicates that it is rare and isolated occurrence.

l 7

8 9 STA

% POWER OTHER STATUS ISCOV RY OtSCOVERY DESCRIPTION NA l

lB l@l Routine Testing l

11 15 ) [EJ@ l 1 l 0 l 0 l@l ACTIVf TY CO TENT LOCATION OF RELEASE RELE ASED OF RELEASE AMOUNT OF ACTivtTY I

NA l

l NA l1 l6]lZ l @ W@l 80 44 45 7

8 9 10 11 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION

• l l t l 7 l l 0 l 0 l 0lhyhl NA y_ Q [

Q PERSONNE L iN2u'IES DHH_

NUMSER

DESCRIPTION

Ii la l l 010101@l NA 7

8 9 11 12 LOSS OF OR O AM AGE TO F ACILITY TYPE D E SC RIPTION l

l1191 l Z lhl NA 7

8 9 10 NA l

lllllllllllll5 ISSUE DE CRIPTION l2]Ol hl 68 69 BC E 7

3 9 10 810428 GANIE OF PUEPARER PHONE:

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