ML20042G674

Accepts Util Response to NRC Bulletin 90-002, Loss of Thermal Margin Caused by Channel Box Bow. Item Considered Closed

ML20042G674
Person / Time
Site:	Big Rock Point File:Consumers Energy icon.png
Issue date:	05/10/1990
From:	Masciantonio A Office of Nuclear Reactor Regulation
To:	Berry K CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
References
IEB-90-002, IEB-90-2, TAC-76319, NUDOCS 9005150260
Download: ML20042G674 (3)

Text

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May 10,.1990 bocketNo.50-155-Mr. Kenneth W. Berry Director, Nuclear Licensing Consumers Power Company 1945 West Parnall Road Jackson, Michigen 49201

SUBJECT:

NRC BULLETIN 90-02 (TAC NO. 76319)

NRC Bulletin 90-02, " Loss of Thermal Margin Caused by Channel Box Bow," issued March 20, 1990, requested li_censeen to d>termine if any channel boxes are being

-i reused after their initial bundle ' lifetime and, if so, to ensure that the, i

effects of channel box bow on the critical power ratio (CPR) are properly taken

'c into account.

1 By letter dated-April 20, 1990, Consumers' Power Compary provided a response to the bulletin.

In that letter, you stated that the magnitude of bowing for the-Big Rock Point channels is less than is expected for typical BWRs.

The remainder i

of the current cycle is not Minimum Critical Power Ratio (MC N ) limiting and there is adequate margin to preclude dryout_ from channel box oow.

You conclude'd i

r

-that compliance with technical specification CPR limits is assured.

The bulletin also requested that the effects of channel box bow be accounted for in analysis supporting the next refueling outage.

In your response, you stated-that analyses evaluating the effect of channel box bow on MCPR'are being

. performed and the results and any actions necessary to preclude the effects of channel box bow will be submitted prior to the start of the next cycle.

Based on your response, we consider this item closed.

.i Sincerely, f

r f( 04&

Armando Masciantonio, Project Manager Project Directorate III-1 Division of Reactor Projects - III, IV, V & Special Projects Office of Nuclear Reactor Regulation j

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May 10, 1990 asse*

Docket No. 50-155

.Mr. 'Kenneth W. Berry Director, Nuclear Licensing Consumers Power Company-

o 1945 West Parnall-Road Jackson, Michigan 49201 h ar Mr. Berry:-

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SUBJECT:

NRC BULLETIN 90-02 (TAC NO. 76319)

'NRC Bu11etin:90-02.5" Loss of Thermal Margin Caused by Channel Box Bow," issued March 20, 1990,. requested licensees to determine if any channel boxes are being-reused after their initial bundle lifetime and,.if so, to ensure that the yn effects'of channel-box bow on the critical power ratio (CPR) are properly taken into account.

'By letter dated ApriF 20, 1990,- Consumers Power Company provided a response'to' the bulletin.

In that' letter, you' stated that the magnitude of bowing-for the Big Rock Point channels is less than is expected for typical BWRs.

The remainder of _the current cycle is not Minimum Critical Power Ratio (MCPR)' limiting and there is _ adequate margin to preclude dryout from channel box bow.

You concluded >

Lthat compliance with technical, specification CPR limits is assured.

The bulletin also requested that the effects of channel box bcw be accounted for

'in analysis supporting the next refueling outage.'

In your response, you stated-

.that analyses evaluating the effect of channel box bowLon MCPR are being-performed and the results and any actions necessary to preclude the effects' of channel box bow will be submitted prior to the start of the next cycle.

Based on your response, we consider this item closed.

Sincerely, d.G. n K Armando Masciantonio, Project-Manager Droject Directcrate III-1 Division of Reactor Projects - III, IV, V & Special Projects Office of Nuclear Reactor Regulation s

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See next page

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Mr. Kenneth W. Berry-J

~ Consumers Power Company Big Rock Point Plant

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~ Mr. Thomas-A'. McNish, Secretary Consumers Power Company 212 West Michigan Avenue Jackson,' Michigan 49201 lJudd L. Bacon, Esquire Consumers. Power Company 212 West Michigan Avenue

-Jackson, Michigan 49201

'Mr. William L. Beckman Plant Manager -

Big Rock '?oint Plant 10269 U.S. 31 North Charlevoix,- Michigan 49720 Jane-E. Brannon, County Clerk

County' Building.

Charlevoix, Michigan 49720 Office of the Governor

Room 1 - Capitol-Building Lansing, Michigan 48913 Regional-Administrator, Region III U.S.: Nuclear Regulatory Commission 799 Roosevelt Road Glen,Ellyn, Illinois 60137 Nuclear Fa'cilities and Environmental Monitoring Section Office Division of Radiological Health P. O. Box 30035-Lansing, Michigan 48909 U.S Nuclear Regulatory Commission Resident Insp u tor Office Big Rock Point Plant 10253 U.S. 31 North

-Charlevoix, Michigan 49720 t

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