05000272/LER-1983-001-03, /03L-0:on 830104,vital Bus 1B Tripped,Rendering RHR Loop Inoperable.Caused by Differential Relay Protection. Redundant RHR Loop Immediately Placed in Operation

/03L-0:on 830104,vital Bus 1B Tripped,Rendering RHR Loop Inoperable.Caused by Differential Relay Protection. Redundant RHR Loop Immediately Placed in Operation

ML20028F426
Person / Time
Site:	Salem
Issue date:	01/19/1983
From:	Frahm R Public Service Enterprise Group
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20028F418	List: 05000272/LER-1983-001-03, /03L-0:on 830104,vital Bus 1B Tripped,Rendering RHR Loop Inoperable.Caused by Differential Relay Protection. Redundant RHR Loop Immediately Placed in Operation ML20028F417
References
LER-83-001-03L, LER-83-1-3L, NUDOCS 8302010344
Download: ML20028F426 (1)

LER-1983-001, /03L-0:on 830104,vital Bus 1B Tripped,Rendering RHR Loop Inoperable.Caused by Differential Relay Protection. Redundant RHR Loop Immediately Placed in Operation

Event date:
Report date:
2721983001R03 - NRC Website

text

U.S. NUCLEAR REGULATORY COMMISSION NRC FORM 366 (7 77)

LICENSEE EVP'T REPORT COkTROL BLOCK: l l

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CON'T 80 74 75 REPORT DATE 68 69 EVENT DATE 60 61 DOCKET NUMBER EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h 7

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l I o l 2 l l On January 4,1983, the Control Room Operator observed that No.1B Vital Bus h Since it is supplied from the bus, No.12 Residual Heat Removal (RHR)

Pump l

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inoperable and l

[ O [ 4 l lwas de-energized; loss of the pump rendered the associated RHR loop The operator immediately started No. 11 RHR l

l O l s j I ction Statement 3.4.1.4a was entered.

A The second pump remained operable, and the event l

[Ol6l l pump to restore Core Cooling flow.

g l constituted operation in a degraded mode in accordance with Technical Specific j

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goj l Investigation revealed that the bus had tripped due to differential relay prote and the bus tested satisfactorily. Power j g lNo apparent cause for the trip was evident,

[,g No.12 RHil pump was declared operable l was restored and no further problems were noted.

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8 9 DISCOVERY DESCRIPTION l

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