ML20031C157
| ML20031C157 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 03/18/1974 |
| From: | CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| AO-2-74, NUDOCS 8110060592 | |
| Download: ML20031C157 (3) | |
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March 18, 1974 f, pipe-.
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si wazzWs Mr. John F. O' Leary, Direct
" c iiis Re: Docket No 50-155 Web, MO License No DPR-6 Directorate of Licensing LG Ato:ic Energy Co==ission
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Big Rock Point
,f Washington, DC 20545 4..s
Dear Mr. O' Leary:
This vill apprise you of an abnor=al occurrence (AO 2-74) in which the diesel generator at the Big Rock Point Plant failed to start on Itirch 7,1974. The DRO Region III Division var. notified by telephone and TdX on March 8 and 11,1974, respectively.
7 Following replacement of the transfor=er on the e=ergency diesel generator local volt =eter (cutput) circuit, the dicsci failed to start on a test att c=pt prior to returning the unit to service. The starting node evitch was placed in the " test" position and the cranking ::ctor cycled only three times with the engine failing to start. (:or=al ersrling cycle in cpproximately cix cra.cs.) On a second attenpt with the mode switch placed in the "te t" position, the engine did not crank at all. The code switch vcs 1. hen placed in the "canual" start position end the diesel gen-erator was started successfully. Tvo additional starts were then attc=pted.
vith the mode switch placed in the " test" position and the diesel started successfully on both atte= pts. Ther unit was then returned to service oper-
'j ation folleving the last successful start. The elapsed ti=e between the first unsuccessful atte. pt to start and the first successful start con-l
.4 sisted of approxicately 11 ninutes (a correction of the 12-=inute interval t
li reported in the March -11,1974 74X).
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.J The reactor was at a steady-state power operation of 50 !Ne l
3 (net) at this time.
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There was no previous history of cranking control failure of this nature.
n On March 8,1974, an inspection of the centrol circuit ec=ponents revealed pitting on one of two parallel sets of contact:: on the IGI relay.
It was cleaned and the unit tested satisfactcrily.
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.2 Docket No 50.-155,- License No DPR-6 7,' y i "'i ~ 7 Big Bo,.;k Point' o,.r y-N/a m' + #-$ e*7~'.'
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- The failure of the diesel generator'to start was attributed to f
either an inter =ittent couponent fail *2re"in'the cranking circuit,'im-(
proper sequencing associated with'the starting mode switch or pitting of
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~the contacts on the MCI relay. 1..;.3 eW
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-.. ' A test was ' conducted on March lle,1974, to simulate interruption -
of the cranking cycle with subsequent start failure on the first atte=pt.
j However, the unit started satisfactorily and the test did not explain the j
cause of the failure unless it had been due to the pitted contacts. In an
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effort to prevent similar future failures, an inspection of the starting
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control components vill be included in the annual preventive maintenance Program.
Ii A redundant emergency power supply was provided by plant modi-f fications during the 1960s. This power supply is a separate tie to Michigan Power Pool electrical grid. As the Big Rock Point Plant capacity is small compared to the Power Pool electrical capacity (less than 1% of the Power Pool capacity), the loss of output of the Big Rock Point Plant vould not
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cause a loss of the grid.
I Yours very truly,
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WGF/ map Ralph B. Cevell Nuclear Licensing Administrator t
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