05000293/LER-1977-009-03, 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: |
| References | |
| LER-77-009-03L, LER-77-9-3L, NUDOCS 8007160648 | |
| Download: ML19320C318 (2) | |
| Event date: | |
|---|---|
| Report date: | |
| 2931977009R03 - NRC Website | |
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LICENSEE EVENT REPORT s
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60 61 DOCK ET NUMS ER 68 63 EVENT DATE 74 75 REPORT QATE 80 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.
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CODE TYPE No.
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40 41 42 43 44 47 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.
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Mr. M. Thc=as McLoughlin 3
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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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