ML19320C318

Updated LER 77-009/03L-1:on 770323,during Standby Operation, HPCI Was Inoperable for 5-h.Caused by Burnt Out Undervoltage Coil in Breaker for Motor Operated Valve Mo 2301-3,steam Supply Valve to Hpci.Caused by Overheating

ML19320C318
Person / Time
Site:	Pilgrim
Issue date:	07/03/1980
From:	Mcloughlin M BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19320C311	List: ML19320C310 ML19320C318
References
LER-77-009-03L, LER-77-9-3L, NUDOCS 8007160648
Download: ML19320C318 (2)

Text

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, s LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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EVENT DESCRIPTION AND PRC0ABLE CONSECUENCES h Io Ial l On March 23, 1977, during Hot standbv ooerations, the HPCI was inocerable for l l o 131 l approximately 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />, because of a burnt out undervoltage coil in the breaker l I o 141 l for clotor operated valve >D 2301-3, steam supply valve to the HPCI. (Refer to l lo Isl I supplement for additional information). l I

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_ SEQUENTI AL CCCUR R ENCE REPORT REVISION LE R/ Ro EVENT YEAR R EPCRT NO. CODE TYPE No.

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42 43 CAUSE CESCRIPTION AND CCARECTIVE ACTIONS @

li lol l A 230V DC coil #1513-2 sucolied bv Cutler-Hammer overheated due to a high floating 1

{itiji charge on the 250V station batterv system. which is necessarv to maintain batterv I I i l 21 l capacity. l 11 131 I l 11 141 l l 7 8 9 80

$A  % PCWER OTHER STATUS IS AY DISCOVERY CESCRiPTION I1 l5' l l Gl@ l 0 l 0 l 0"]@l" N.A. l lAl@l Operational Event l AdriviTY Cc5 TENT RELEASED CPRELEASE AMOUNT OP ACTIVITY LtXATION CP AELEASE N.A. l l N.A. l l i l 68 l3l Zl @ ltoZ l@l 7 11 44 45 80 PER$CNNEL EXPCSURES NUUSER TYPE C ESCRIPTION

• l i l 71 l 0l 0 l 0 l@l Zl@l N.A. l PERSONN E L INJURIES NLVBER CESCRIPTION l i j a j l 0 l 0 l 0 l@l N.A. l 7 8 9 n 12 80 LCSS or CA OAV AGE TO P4CILITV Q TYPE DESCRIPTION v N.A.

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<t BOSTON EDISON COMPMPI PILCRn! NUCLEAR PCWER STATION

, DOCKET No. 50-293

. Attachment to LER 77-009/03L-1

• Event Description On March 23, 1977 at approximately 1245 hours0.0144 days <br />0.346 hours <br />0.00206 weeks <br />4.737225e-4 months <br />, smoke was observed in the _ area of 250V DC Motor Control Center D9. Further investigation traced the source of smoke to breaker 72-944, powar supply to HPCI steam supply motor operated valve M02301-3. The breaker was de-energized and maintenance investigation found the undervoltage coil burnt out.

The burnt undervoltage coil and relay assembly were removed. Replacement under-voltage coils of a larger capacity were evaluated and PDCR 76-89 issued to permanently resolve this problem. . While this study is in progress, the per-missives for undervoltage protection for motor operated valve MO-2301 have been jumpered in accordance with approved station operating procedures. The breaker was returned to servic.e and tested at approximately 1745 hours0.0202 days <br />0.485 hours <br />0.00289 weeks <br />6.639725e-4 months <br /> on March 23, 1977 and the HPCI_was declared operable.

J During the Re'fue'1'IV Outage, the above undervoltage coil and reiay assesiy- ~

and similar units on other safety related equipment were upgraded. PDCR 76-89 has been completed.'

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