ML20151C195
| ML20151C195 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 11/06/1975 |
| From: | Sewell R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| AO-24-75, NUDOCS 8103090364 | |
| Download: ML20151C195 (1) | |
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VEDP43(1712)(1-029859C310)PD 11/06/75 1707 g*
TLX CO."SP0YER JKN ZCZC 004 DLY _ JACKSON FICHIGAN 11-S- 7 h8 k 9 3o,
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THIS IS TO FULFILL OUR VRITTEN CorYITVElli TO THE NRC CF AO 2$75 A S REPORTED TO YOUR YP. HUNIEP. BY D E DE P OOR AT 0930 NOVEf'BER 6, 1975.
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PEPO?.T NO - A0 E4-75, DDCKET 50-155 m
EA REPORI DATE - NOVEt3ER 6, 1975 p..,
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E3 0'CCURRENCE DATE - ABOUT JULY 1975, CLASSIFIED A0 ON 11-6-75.
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3 FACILITY - BIG ROCK POINT PLANT 8
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4 IDE'iTIF IC A T IO N OF OCCURRENC_E,- IrPROPERLY AUTHORIZED ADDITICN 8
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CF LOAD TC ScFETY RELATED 4E0 VOLT BUS EA.
5 COCITIONS PRIOR TC OCCUERENCE - STEADY STATE FCVER CFER ATICN.
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d DESCRIPTION OF CCCURRENCE - DURI';2 REVIEV CF A PRO?CSEC ADDI-TIONAL LCAD ON BREAKEP SE-Et-63 CIRCUIT IN OCTOBER 1975, TFE CUES-t TION OF DESIGN ANALYSIS VA5 RAISED O!! THE ADDITION CF TFE SREAKER AND THE NEV SECURITY SYSTEP LOAD ON OR ABOUT JULY 1975 SUBSEQUENT i
- "' *T'/ I EV CN 11-6-75 REVEALED THAT NO DESIGN ANALYSIS HAD BEEN DONE.
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'7 DESIGNATION OF APPARENT CAUSE OF OCCURRENCE - FAILURE OF AD-PINISTR ATIVE CONTROLS.
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' 8 ANALYSZS OF OCCUR NCE - PC3TULATED LOSS OF '
2A BUS DUE TO U NC00RD!NATED TRlPPIN3 CR EXCESSIVE LOAD.80VLD INC APACITETE SEVERAL REDUNDANT SAFETY RELATED PIECES OF' EQUIPVENT AND THE STA TION BATTERY r
- C HAR GER.
HOWEVER, A PRELIFINARY ANALYSIS ON 11-6-75 AT 0830 BASED ON ACTUAL CIRCUIT LOADS INDICATE 3' CON 3IDERABLE FARGIN FOR LOAD AND IS NOT OF CONCERN AT THIS TIFE.
A TRIPPING CCORDINATICN STUDY IS NEEDED, HOWEVER.
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9 CORRECTIVE ACTION - A CIRCUIT DESIGN ANALYSIS HAS 3EEN RECUESTED U
5*' WDF ENGINEERING SUPPORT GROUPS TO FULLY JUSTIFY THE EXISTING CIR-C UIT CONFIGURATION.
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10 FAILURE DATA - SIVILAR AND RELATED.TO A0 22-75 PER OUR LETTER OF SEPTEMBER 22, 1975.
O RALPH 9 SEUELL NUCLE AR ' LICENSING A DP CONSUFERS POWER CO ALL HO l
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