ML17331A460

LER 80-020/03L-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

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: ML17319A623 ML17331A460
References
LER-80-020-03L-01, NUDOCS 8009300517
Download: ML17331A460 (4)

Text

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

LICENSEE EVENT REPORT CONTROL BLOCK:

,Q {PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

Q4~09

[OD1]

7

~O 7

CON'T 8

8 9

M I soURGE D

LICENSEE CODE MLQB 60 C

61 0

14 5

15 EVENT DESCRIPTION AND PROBABlE CONSEQUENCES +10 0 0 0>>

DOCKET NUMBER LICENSE NUMBER 5 Q7 68 69 0

0 8>>

0 EVENT DATE 0

25 Q2 8

26 4

0 74 1

QB 75 I

LICENSE TYPE 0

1 9

1 2

30 REPORT DATE

'9 57 CAT 58 80 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. THIS CONDI-

~o4 TION WAS NONCONSERVATIVE WITH RESPECT TO TECHNICAL SPECIFICATION 3.8.2,1. SIMILAR

~o 6 OCCURRENCES INCLUDE, 050-0315/79-22.

~06

~OB 80 7 8 9 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

~09 7 8 9 10 04 11 E 0'2 LGJ042 12 13 G E N E R A 18 044 ~FQ>9 19

~ZS 20 SEQUENTIAL OCCURRENCE REPORT REVISION EVENT YEAR REPORT NO. CODE TYPE NO.

Q2 LER1RP 922O92

[Jg 21 0

22 Q

23

~0..2 24 0

26 QZ 27

~03 28 29 QL 30

[J 31 QO ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRDP PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOLIRS +22 SUBMITTED FORM SUB. SUPPLIER MANUFACTURER

~A019 ~Z019 ~A029 ~0024 0 0 Z 3 ~Y Q22 ~Y024 ~N029 5 2 5 0 Q29 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 o 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 7 8 9 80 FACILITY ~3P METHOD OF POWER OTHER STATUS QBO DISCOVERY DISCOVERY DESCRIPTION Q32 STATUS 55 9 E Q9 ~09 10 5 Q9 12 NA 44

~AQ31 OPERATIONAL EVENT 80 7 8 9 13 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE Q 6 ~Z Q3 ~ZQ34 NA 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION Q39

~00 0 0>>~ZQ>> NA 80 7 8 9 11 12 13 PERSONNEL INJURIES NUMBER DESCRIPTION~4" 0 0 049 NA 7 8 9 11 12 80 LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION Q43 9 Z Q42 NA 7 8 9 10 80

~2o ~NQ ISSUED PUBLICITY DESCRIPTION ~ 8'oa Zoo NRC USE ONLY 29 a

2 8 9 10 68 69 80 49 S. D. DELONG 465 5901 NAME OP PREPARER PHDNE

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

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