ML20040G688

LER 81-078/01X-1:on 811223,during Automatic Depressurization Sys Valve Surveillance,Electromatic Relief Valve 2B Failed to Open.Caused by Wire Wedge in Contact That Bypass Hold Coil.Wires Moved

ML20040G688
Person / Time
Site:	Dresden
Issue date:	01/27/1982
From:	Zirwas K COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20040G683	List: ML20040G682 ML20040G688
References
LER-81-078-01X, LER-81-78-1X, NUDOCS 8202160368
Download: ML20040G688 (3)

Text

LICENSEE EVENT REPORT

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EVENT DESCRIPTION AND PROSA8LE CONSEQUENCES h l o 121 l Durine normal ooeration while nerformino ADS vn1ve onernh4141v am-ve 411 n n e o . ehe 9R I l"o~lTl l electromatic relief valve failed to op: 1. Because of HPCI being inoperable. an immedi- 1 JolAl l ate shutdown was initiated (T.S.3.5.C). This event had minimal effect upon public healthl ITTTI l and safety because remaining ADS valves and low pressure ECCS systems were operable. I Io to l l Last similar occurrence: R.o. 50-249/81-25. I 10171 l I l oia l i I 7 8 9 80 EE E #

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( lilol l A wire became wedged in the contact that bypasses the hold coil, causing it to be placed i I

l lilil lin series with the pick'up coil, preventing solenoid operation. All wires were moved andI l

secured so as not to interfere with the contact. Inspections will be made during the l

,,,,, l next outage of sufficient length and future refueling outages to prevent recurrence. l 11 141 I I 7 a 9 a0 3A  % POWER OTHER$7ATUS I O ERY OBSCOVERY DESCRIPTtoM l li is l Wh y 7 8 l0 l9 l5l@l 12 11 N/A 44 l lCl@l as as Surveillance Testing 30 l

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1 7 10 68 69 80 3 l NAME OP PREPARER PHONE-(815) 942-2920, x-483 23

ATTACHMENT TO LICENSEE EVENT REPORT 81-78/0lX-1 COMMONWEALTH EDISON COMPANY (CWE)

DRESDEN UNIT 2 ILDRS 2 DOCKET # 050-237 During normal operation while performing ADS valve operability surveillance due to HPCI being inoperable, the 2B electromatic relief valve failed to open. An immediate 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 pressure 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 placed in series with the pick-up coil thereby reducing the voltage across the pick-up coil to below the miriimum pick-up voltage and preventing solenoid operation.

The wires were fastened out of the way so as not to interfere with the contact. Inspections will be made during the next outage of -

sufficient length and during subsequent refueling outages to prevent recurrence.

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. SUPPLEMENT TO OVR '

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DVR NO. -

STA UtilT. YEAR  !!O.

D 12 -

2 -

81 - 138

~PART I l TITLE OF EVENT OCCURRED 12-23-81 1930 Failure of 2B Electromatic Relief Valve to Open DATE TIME REASON FOR SUPPLEMEtiTAL REPORT Change to cause description and corrective action S

PART 2 l

• ACCEPTAtlCEBYSTkTIONREVIEW 4 .3_ _ > e/ [,.]

DATE t/.a1/72 I' .2 L '

SUPPLEMENTAL REPORT APPROVED f/) .

AllD AUTHORIZED FOR DISTRIBUTI0li dk, /V W t- t-STATION iUPylNTENDENT DATE f

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