05000289/LER-1980-001-01, /01T-0:on 800123,during Load Study,Determined That Potential Overload Condition Could Exist on 1P 480-volt Bus W/Failure of Is 480-volt Bus.Caused by Inadequate Design

/01T-0:on 800123,during Load Study,Determined That Potential Overload Condition Could Exist on 1P 480-volt Bus W/Failure of Is 480-volt Bus.Caused by Inadequate Design

ML19290C992
Person / Time
Site:	Crane
Issue date:	02/06/1980
From:	Mitchell D METROPOLITAN EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19290C984	List: 05000289/LER-1980-001, Forwards LER 80-001/01T-0 05000289/LER-1980-001-01, /01T-0:on 800123,during Load Study,Determined That Potential Overload Condition Could Exist on 1P 480-volt Bus W/Failure of Is 480-volt Bus.Caused by Inadequate Design
References
LER-80-001-01T, LER-80-1-1T, NUDOCS 8002150302
Download: ML19290C992 (2)

LER-1980-001, /01T-0:on 800123,during Load Study,Determined That Potential Overload Condition Could Exist on 1P 480-volt Bus W/Failure of Is 480-volt Bus.Caused by Inadequate Design

Event date:
Report date:
2891980001R01 - NRC Website

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80 el OOCKET NuwegR es ce tv847 3ATR 74 IS ASPORT QATE 80 EVENT DESCRIPT1ON AND PRC8ASLE CCNSECUENCES O'o o 2 l As the result of a load study performed on the ES buses, it has been determined (3TTl I that.a potential overload condition could exist on the IP 480V hus during the I

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I following conditions (1) Failure of the IS 480V bus, (2) ESAS Actuation and I

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-,1c.0,iad current to the IP 480V bus exceeds the lone deliv afetnm get*4 w of f

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.2 CAUSE DESCRIPT1oN AND CCARECTIVE ACTtoNS jThe cause for the potential occurence annears to be inadeouate desien for the 1

i,o gcondition indicated. The corrective action will he to verify tha validity of the t Tf the inadeouate desien I g i assumptions used in the study and the results obtained.

lis verified, modifications will be made to assure that tha IP 480V bus will sunolvI

,,3 Ithe required ESAS loads with or withcet failure of the IS hus.

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. 10 Continued with Technical Specification 6.9.2.A(9).

A marginal loading condition was also indicated for the 1A ES motor control center.

27 Continued short term action is needed since the unit is in cold shutdown. A program for resolution of the problem will be defined prior to June 1, 1980.