ML20141M063

Responds to Confirmatory Action Ltr CAL-RIII-92-05 Re Failed Flow Distributor hold-down Bolt & Provides Planned Actions.Requests Release from Subj Ltr Per Commitment Not to Restart Plant Until Repairs Are Complete

ML20141M063
Person / Time
Site:	Big Rock Point File:Consumers Energy icon.png
Issue date:	03/20/1992
From:	Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
CAL-RIII-92-05, CAL-RIII-92-5, NUDOCS 9203310267
Download: ML20141M063 (2)

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< Consumers POWBr o. it , se,,m.n Vke hnant NW5NINO Nwirar lhvratum MICHIGAN'S PROGRESS General Offcos 1946 West Parnait Road. Jackson, Mt 49201. {517) 7684tb3 March 20, 1992 Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 DOCKET 50-155 - LICENSE DPR BIG ROCK POINT PIANT - F7NAL RESPONSE TO CONFIRMATORY ACTION LETTER (CAL-RIII-92-005) - FLOW DISTRIBUTOR HOLD DOWN BOLT FAILURE

References:

1) Confirmatory Action Letter dated February 6, 1992 (CAL-RI11-92-005)

2) CPC letter to NRC dated March 4, 1992

3) CAL-RIII-92-005 Amendment I dated March 3, 1992

4) NRC Lette- to CPC dated March II, 1992

5) CPC Letter to NRC dated March 12, 1992

6) CPC Letter to NRC dated March 18, 1992 The oubject Confirmatory Action Letter summarized previous discussions between CPC and the NRC staff related to the failed flow distributor (FB/FD) hold-down bolt and our planned actions. In summary, these actions included an evaluation to demonstrate the capability of the rensining three bolts to retain the FB/FD, consequences of bolt failure, and a 10CFR50.59 evaluation to support

. interim plant operation in this condition. The letter also required that CPC fully address these actions in a meeting with the Region III Administ:rator' L prior.to plant start-up. At that time, CFC wauld also addrese long term corrective actions.

As discussed-in the referenced letters, CPC had completed its evaluation of M

the hold down bolt failure and interim plant operation and presented the

!- results to NRC staff personnel. However, following extensive discussions and efforts in responding to questions concerning these evaluations, Consumers Power Company has decided to extend the current outage to repair the flow distributor / flow baf.fle hold down bolt prior to plant start-up. Although we continue to believe that there was no increased risk associated with the safe operation of the plant due to the f ailed FB/FD bolt, we have not becu successful I

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'in convincing the_ NRC staf f of that position. Since CPC believes that further ef fort- to resolve our dif ferences would further delay plant start-up. CPC has Lelected to commence permanent- repair.

As- discussed in our letter dated March 12, 1992. CPC has concluded that replacing the fout (4) hold down bolts for the south FB/FD vould restore the .

system to original design. Also, since the repair activity will require removal of both the north and south FB/FD and the Core Support Plant, our current plans'are to replace all eight (8) hold down bolts, This would also eliminate' any concerns if they exist as to the adequacy of the bolts on the -

north FB/FD Consumers Power will also attempt to validate its position that the remaining bolts on the south FB/FD have not lost their pre-load, providing this can be accomplished without schedule delays or significat.t radiation

- exposure.

Consumers Power Company requests that we be released from the subject Confirmatory Action Letter based on our commitment not to restart the plant until the repairs are completed.

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David P Hoffman-Vice President Nuclear Operations Department CC: Administrator. Region III. USURC NRC Resident Inspector - Big Rock Point 0C0382-0043A-BX01

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