05000315/LER-1980-020-03, /03L-0:on 800831,during Normal Operation,Unit Trip & Train a Safety Injection & Steam Line Isolation Occurred. Caused by Shorted Diode in Crid 4 Inverter.All Diodes & Oscillator Boards Replaced,Tested & Returned to Svc

/03L-0:on 800831,during Normal Operation,Unit Trip & Train a Safety Injection & Steam Line Isolation Occurred. Caused by Shorted Diode in Crid 4 Inverter.All Diodes & Oscillator Boards Replaced,Tested & Returned to Svc

ML17331A460
Person / Time
Site:	Cook
Issue date:	09/24/1980
From:	Delong S INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17319A624	List: 05000315/LER-1980-020, Forwards LER 80-020/03L-0 05000315/LER-1980-020-03, /03L-0:on 800831,during Normal Operation,Unit Trip & Train a Safety Injection & Steam Line Isolation Occurred. Caused by Shorted Diode in Crid 4 Inverter.All Diodes & Oscillator Boards Replaced,Tested & Returned to Svc
References
LER-80-020-03L-01, NUDOCS 8009300517
Download: ML17331A460 (4)

LER-1980-020, /03L-0:on 800831,during Normal Operation,Unit Trip & Train a Safety Injection & Steam Line Isolation Occurred. Caused by Shorted Diode in Crid 4 Inverter.All Diodes & Oscillator Boards Replaced,Tested & Returned to Svc

Event date:
Report date:
3151980020R03 - NRC Website

text

U. S. NUCLEAR REGULATORY COMMISSION NRC FORM 366 (7.7.7)

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CON'T

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{PLEASE PRINT OR TYPE ALLREQUIRED INFORMATION)

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9 2 '9 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABlE CONSEQUENCES +10 DURING NORMAL PLANT OPERATION A REACTOR TRIP, TRAIN A SAFETY INJECTION AND STEAM LINE

~o3 ISOLATION OCCURRED AS A RESULT OF THE LOSS OF A 120 VOLT A.C. VITAL BUS.

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THE CAUSE OF THE FAILURE WAS DUE TO A SHORTED DIODE IN THE CRID IV INVERTER WHICH IN 1

TURN CAUSED THE AC +

DC INCOMING LINE FUSES TO THAT INVERTER TO BLOW.

ALL SCR' 2

DIODES AND OSCILLATOR CIRCUIT BOARDS WERE REPLACED AS A PRECAUTIONARY MEASURE AND THE

~l3 INVERTER WAS TESTED AND RETURNED TO SERVICE.

THE CAUSE OF THE DIODE FAILURE, WESTIN HOUSE k'70D6R-1 HAS BEEN ATTRIBUTED TO NORI1AL END OF LIFE.

THE ACTION REQUIREMENTS 9

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10 12 13 44 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITY 6

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11 12 13 PERSONNEL INJURIES NUMBER DESCRIPTION~4" 0

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FACILITY

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ATTACHMENT bl CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 OF TECHNICAL SPECIFICATION 3.8.2.1 WERE FULFILLED.

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