ML20039G277

LER 81-078/01T-0:on 811223,while Performing Operability Surveillance,Electromatic Relief Valve 2B Failed to Open. Caused by Wire Wedged in Contact That Bypasses Hold Coil. All Wires Removed & Secured

ML20039G277
Person / Time
Site:	Dresden
Issue date:	01/05/1982
From:	Zirwas K COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20039G274	List: ML20039G273 ML20039G277
References
LER-81-078-01T, LER-81-78-1T, NUDOCS 8201150457
Download: ML20039G277 (3)

Text

(7 771 1.lCENSEE EVENT REPORT

. CONTROL SLOCK: l 1

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7 8 60 68 DOCKET NLMSER 68 69 EVENT 0*TE 74 75 REPORT DATE 80 EVENr OESCRIPTION AND PROSASLE CONSEQUENCES h I o 12 l l During normal operation while performing ADS valve operability surveillance. the 2B l

,o,3, g electromatic relief valve failed to open. Because of HPCI being inoperable, an immedi-l

,o,,,l ate shutdown was initiated (T.S.3.5.C). This event had minimal effect upon public l

,,,,, , health and safety because remaining ADS valves and low pressure ECCS systems were oper-l l 016 l l . ence: R.O. W M M G . g jo17l l l 1 o Ie i I I 7 8 , 80

• [cE ToiE si$s*Cio E CcMPoN ENT CODE SUS D'E SU E l0191 7 8 lS lF l@ l El@ W@ l Vl Al Ll Vl 0 l P l@ lF l@ lZ l@

9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPCRT R EVl510N LER E'v TNT YEAR REPCRT NO, COCE TYPE NO.

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g 18 Ill 21 22 I-l 23 10 17 18 I 24 26 I/I 1011 I 28 I Tl 1- - I O 27 29 30 31 32 EN ACTION P T METH HOURS 58 s PCR 8. SL 1. R MA UP RER IB 33 l @ 34LyJ@ lAl@ laI@ lo 10 13 la i I vi@ lyl@ IN l@ ID 12 lc 1347I@

33 36 37 40 41 42 43 44 CAUSE DE3CRIPT10N AND CORRECTIVE ACTIONS 27 l1 tol [ The' failure was due to a wire that became ohvsica11v vedced in the contact % e bv- I li li I l passes the hold coil. This caused the hold coil to be prematurely claced in snrios I g l with the pick up coil, preventing solenoid operation. All wires were moved and secured l g,;3gl so they will not interfere with the contact. Inspections during refueling outages will]

gig.il include checking the wires to prevent recurrence. l 7 8 9 80

'sTA %PCWER QTHERSTATUS 01 O ERY 0,5CCVERY CESCRIPT1GN I1 l 5 l l E l@ l 0 l 9 l 5 lgl N/A l lC l@l Surveillance Testing l l A VITY CO TENT (ELEAsEo cP RELEASE LOCATION CP RELEASE @

l1 l 6 l l Zl g l Z l l N/A AMOUNT CP ACTIVITY l N/A @ l l PERscNNEL EXPOSU ES NcM8ER TYPE oE CR,P,cN @ N/A li lil 'l0' 10 l0 l@lz l@l

l PERse~NE'L ,Nau',2,Es '

NU 8ER DESCRIPTION N/A l'7Is la!8 9I I I l@l12 11 80 l

LOSS CP CA DAMAGE TO PACIUTY Q D ESCRIPTION v N/A I 2191 7 8 9 l]El@l 10

--l 8201150457 820105 80 ISSUE DE CRIPTION @ PDR ADOCK 05000237 NRC USE ONLY ,

12#oiINf@l N/A S PDR llglllllllllj 7 8 9 to 68 69 80 3 K. Zirvas NAME OF PREPARER PHONE:

(315) 942-2920. X-483

• 1

e ATTACHMENT TO LICENSEE EVENT REPORT 81-79/01T-o COMM0tEEALTH EDISON COMP.WY (C'4E)

DRESDEN UNIT 2 ILDRS 2 DOCKET # 030-z3/ -

F During normal operation while performing ADS valve operability surveillance due to HPCI being inoperable, tl.e 2B electromatic relief valve failed to open. An 1:nmediate shutdown was begun per T.S.3.5.C.

This event had minimal effect upon public health and safety since the remaining ~ ADS valves and all low pressere ECCS systems were operable.

The reactor pressure was less than 90 psig within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> as required. <

Failure of the electromatic relief valves has occurred before, the last being reported by R.O. 50-249/81-25.

The failure was due to a wire that became physically wedged in the contact that bypasses the hold coil. Because the contact could not close, the hold coil was prematurely placed in series with the pick-up coil thereby reducing the voltage across the pick-up coil to below the minimum pick-up voltage and preventing solenoid operation.

The wires were fastened out of the way so as not to interfere with the cantact. Inspection during refueling outages _will include checking

, the wires to prevent recurrence. ~

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DEVIATION REPORT

, g~ -) Con;monwealth Ei_ son gy, yg, , , ,

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N sTA17 uni 3 nARg1N g y PART 1l Yt TLE OF DEVIATION OCCURRE0 12/23/81 1930 Failure Of 2B Electromatic Relief Valve To Open m my SYSTEM AFFECTED PLANT STATUS AT TIME CF EVENT TESTING Auto Blowdewn MODE h . P*StM*Ti 2420 , toAccuAEj 796 p5 O CESCRIPTlCN OF EVENT At 1210 HPCI was declared inoperable due to a malfunction of its fire _

deluge system. At 1930 2B electromatic relief valve failed to open while being tested as required by Tech Specifications. With both HPCI and ADS declared inoperable, an unusual event was initiated and an orderly shutdown coC:menced to be less than 90 psig within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. NRC notified at 1945 with follow up verification call from them at 2004. Failure of 23 electromatic relief valve to operate was verified by no change in steam flow, no (over) 10 CrRs0.72 NRC RED PwCNE O NOTIF ICATION MADE YES No a t 1945 Ecu 1 PMENT F A I LU R E D17698

@vES O NO . OR< REcuEsT NO. RESPONSietE supe = visor Gary L. Smith g,7g &&M P ART 2 l 0PERATING ENGINEER'S cow 8ENTS Orderiv unit shutdown per DGP 2-1 initiated. Remaining 4 ADS "alves operated satisfactorily.

EVENT Or PustrC INTEREST h 24-HCUR NRC NOTIFICATION REQ'O TELEPH Nne &&M MG O TECH. SPEC. VICLATICN REGION 118 DATE TIME NON REPORTABLE CCOURRENCE TELEGM/TELECOPY h 14 CAY RE80RTABLE/T.S.b

• b 3.1* D REGION til DATES TIME O so CAY aE*0RTABLE/T S- CEC, Co ,oR,rt sor,,,C,7,c, ,,,,

ANNUAL /SPECL REPORT REC'O IF ABOVE NOTIFICATION 15 PER 10CFR21 A.I.R. e

] 5-DAY ARITTEN REPORT RE0'O PER 10CFR21 L.E.R.

• l'  ! lT TELEPH F. A. Palmer 12/24/81 1440 CECO CORPORATE OFFICER DATE TIME a

PRELIMINARY REPCRT . John W. Wujciga COMPLETED AND REVIEwE0 12/24/81 GPER A TING ENGINEER / 3 ATE

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1NVESTIGATED REPORT & RESOLUTICN ACCEPTED 8Y STATION REviEA d. h _s I eem

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f f _ /-b b RESOLUTION APPROVED AND AUTHCR I ZED FCR D I STR IBUTION =

' 'S /*&-f2-gg.gg76 (Fosu f5-52-13 '0*01 STATION SMNTENDENT CATE 1

A Description of Event (con't) change in control valve position, accoustical monitor not actuating, and no change in blowdown valve temperature. Fuses were replaced but did not help.

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