ML18038A645

Discusses Calculated Dose Rates Due to Shine from Reactor Bldg Atmosphere to Control Room & Security Bldg Following Design Basis Loca,Per IE Insp Rept 50-220/83-15.Doses Not Expected to Exceed 5 Rem During First 8 H Following DBA

ML18038A645
Person / Time
Site:	Nine Mile Point
Issue date:	03/19/1984
From:	Mangan C NIAGARA MOHAWK POWER CORP.
To:	Vassallo D Office of Nuclear Reactor Regulation
References
NUDOCS 8403230116
Download: ML18038A645 (6)

Text

REGULATORY FORMATION DISTRIBUTION 'S -EM. ('RIDS)

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SUBJECT:

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expected 'to exceed 5 rem, during first' h following DBA, OISTRIBUTION COOE>>

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7 MIIASAIRlA o 0 g IgQog@QK NIAGARA MOHAWK POWER CORPORATION/300 ERIE BOULEVARD WEST, SYRACUSE, N.Y. 13202/TELEPHONE (315) 474-1511 March 19, 1984 Director of Nuclear Reactor Regulation Attention: Mr. Domenic B. Vassallo, Chief Operating Reactors Branch No. 2 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Re: Nine Mile Point Unit 1 Docket No. 50-220 DPR-63

Dear Mr. Vassallo:

Our September 6, 1983 letter indicated that we would calculate the dose rates due to shine from the reactor building atmosphere to the control room and security building following a design basis loss of coolant accident.

These calculations were to formally resolve questions which arose during your Inspection No. 83-15.

The 30 day integrated exposure to the control room due to shine from the reactor building atmosphere has been conservatively calculated to be 2.85 Rem. When this exposure is added to the 30 day integrated exposure due to other sources of radiation, the total does not exceed 5 Rem. The average 30 day exposure rate due to reactor building shine is approximately 4 mR/hr.

This is significantly less than the NUREG-0737 suggested guideline of less than 15 mR/hr on average for areas requiring continuous occupancy.

Our calculations determined that the 30 day integrated dose to the security building due to reactor building shine wi 11 exceed dose guidelines for areas requiring continuous occupancy. However, continuous occupancy of the security building for 30 days following an accident is not required by our emergency procedures. The security building is the primary assembly area for security personnel, but alternate assembly areas are specified in the event that the security building is uninhabitable.

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Mr'. Domenic B. Vassallo March 19, 1984 Page 2 Instructions for evacuation of security personnel, if necessary, following completion of a site evacuation are provided in the emergency procedures.

Integrated doses in the security building are not expected to exceed 5 Rem during the first eight hours following a design basis accident, at which time site evacuation should be complete.

Sincerely, NIAGARA MOHAWK POWER CORPORATION C. V. Manga Vice President Nuclear Engineering and Licensing CVM/SMK:slw

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