ML20041E113

Requests Analysis to Demonstrate Reactor Operators Have 30 Minutes Available After Alarm to Terminate Boron Dilution Accident Assuming Worst Single Failure.Analysis Required Before Next Entry Into Model 6 - Refueling

ML20041E113
Person / Time
Site:	Yankee Rowe
Issue date:	02/18/1982
From:	Crutchfield D Office of Nuclear Reactor Regulation
To:	Kay J YANKEE ATOMIC ELECTRIC CO.
References
LSO5-82-02-074, LSO5-82-2-74, NUDOCS 8203100159
Download: ML20041E113 (3)

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February 18, DISTRIBUTION:

1982 Docket No. 50-29 mDocket g LS05-82-02-074 NRC PDR LPDR NSIC f ),L ORB #5 RF Mr. James A. Kay Glainas s

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SUBJECT:

BORON DILUTION ACCIDENTS IN MODE 6 - YANKEE N % #,a By letter dated July 22, 1981, the Commission issued Amendment No. 69 to your license to incorporate provisions into the Technical Specifications required for operation with the refueled Core XV. The safety evaluation associated with this amendment reviewed the analyses performed by Yankee regarding boron dilution accidents in all possible plant operational modes (Modes 1 through 6) and concluded that these analyses were acceptable.

A recent staff review of your submittal and our evaluation has determined that for operation in Mode 6 (Refueling), the operator action time availa-ble between the receipt of an alarm and the time when shutdown margin will be lost is not consistent with the time listed in Paragraph II.2.d of Standard Review Plan (SRP) 15.4.6.

Specifically, the SRP states that 30 minutes should be available while your submittal of March 26, 1981, indicates that at least 20 minutes is available. Operation in all other modes remains acceptable. We, therefore, request that, prior to your next. entry into

- Mode 6, you provide an analysis to demonstrate that the operators have 30 minutes available after an alarm to terminate a boron dilution accident, assuming the worst single failure. The analysis should be accompanied by appropriate changes to the Technical Specifications, if necessary. Please contact us if you have any questions.

Sincerely, Dennis M. Crutchfiel Chief Operating Reactors Branch #5 Division of Licensing cc:

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February 18, 1982 Docket tio. 50-29 LS05-82-02-074 Mr. James A. Kay j

Senior Engineer - Licensing Yankee Atomic Electric Company 1671 Worcester Street Framingham, Massachusetts 01701

SUBJECT:

BORON DILUT10f1 ACCIDEllTS IN MODE 6 - YANKEE By letter dated July 22, 1981, the Commission issued Amendment No. 69 i

to your license to incorporate provisions into the Technical Specifications required for operation with.the refueled Core XV. The safety evaluation associated with this amendment reviewed the analyses performed by Yankee i

regarding boron dilution accidents in all possible plant operational modes (Modes 1 through 6) and concluded that these analyses were acceptable.

A recent staff review of your submittal and our evaluation has determined that for operation in Mode 6 (Refueling), the operator. action time availa-ble between the receipt of an alarm and the time when shutdown margin will be lost is not consistent with the time listed in Paragraph II.2.d of Standard Review Plan (SRP) 15.4.6.

Specifically, the SRP states that 30 minutes should be available while your submittal of March 26, 1981, indicates that at least 20 minutes is available. Operation in all other modes remains acceptable. We, therefore, request that, prior to your next entry into

' Mode 6, you provide an analysis to demonstrate that the operators have 30 minutes available after an alarm to terminate a boron dilution accident, assuming the worst single failure. The analysis should be accompanied by appropriate changes to the, Technical Specifications, if necessary. Please contact us if you have any questions.

Sincerely,

'4tE4h Dennis M. Crutchfiel Chief Operating Reactors Branch #5 Division of Licensing cc:

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Mr. James A. Kay February 18, 1982-cc :

Mr. James E. Tribble, President Yankee Atomic Electric Company 25 Research Drive Westborough, Massachusetts 01581 Greenfield Community College 1 College Drive Greenfield, Massachusetts 01301 Chairman Board of Selectmen Town of Rowe Rowe, Massachusetts 01367 Energy Facilities Siting Council 14th Floor One Ashburton Place Boston, Massachusetts 02108 U. S. Environmental Protection Agency Region I Office ATTN: Regional Radiation Representative JFK Federal Building Boston, Massachusetts 02203 Resident Inspector Yankee Rowe Nuclear Power Station

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Post Office Box 28 Monroe Bridge, Massachusetts 01350 Ronald C. Haynes, Regional Administrator Nuclear Regulatory Commission, Region I Office of Inspection and Enforcement 631 Park Avenue i

King of Prussia, Pennsylvania 19406 1

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