ML20151A270

Forwards SER Re Safety Concern Involving Potential for Control Room & Technical Support Ctr Personnel Incapacitation Resulting from Aqueous Ammonia Spill. Sufficient Reaction Time Provided in Event of Spill

ML20151A270
Person / Time
Site:	Rancho Seco
Issue date:	07/13/1988
From:	Knighton G Office of Nuclear Reactor Regulation
To:	Firlit J SACRAMENTO MUNICIPAL UTILITY DISTRICT
Shared Package
ML20151A274	List: ML20151A270 ML20151A277
References
NUDOCS 8807190312
Download: ML20151A270 (3)

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-t July 13, 1988 Docket No.: 50-312 Mr. Joe Firlit Chief Executive Offica, Nuclear-Rancho Seco Nuclear Generating Station 14440 Twin Cities Road Herald, California 95638-9799

Dear Mr. Firlit:

In a letter dated May 19, 1988, SMUD responded to a safety concern identified by the NRC staff involving the potential for Control Room and Technical Support Center personnel incapacitation resulting from an aqueous amonia spill. Your proposal to reduce the concentration of the ammonia stored on site to 20%

was reviewed by the staff. Our independent evaluation concluded that the reduced volatility of a 20% amonia solution will provide sufficient reaction time for personnel to initiate protective actions and continue with their duties in the event-of an amonia spill. The staff safety evaluation is enclosed.

Based on comunication with the Rancho Seco site staff, we understand that the ammonia stored on site has already been reduce to 20% concentration. Please notify this office imediately if this is not the case.

Sincerely, original signed by Harry Rood for George W. Knighton, Director Project Directorate V Division of Reactor Projects - III, IV, V and Special Projects Office of Nuclear Reactor Regulation

Enclosure:

As stated 1

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% , , ,o July 13, 1988 Docket No.: 50-312 Mr. Joe Firlit Chief Executive Office, Nuclear Rancho Seco Nuclear Generating Station 14440 Twin Cities Road Herald, California 95638-9799

Dear Mr. Firlit:

In a letter dated May 19, 1988, SMUD responded to a safety concern identified by the NRC staff involving the potential for Control Room and Technical Support Center personnel incapacitation resulting from an aqueous amonia spill. Your proposal to reduce the concentration of the amonia stored on site to 20%

was reviewed by the staff. Our independent evaluation concluded that the reduced volatility of a 20% amonia solution will provide sufficient reaction time for personnel to initiate protective actions and continue with their duties in the event of an amonia spill. The staff safety evaluation is enclosed.

Based on comunication with the Rancho Seco site staff, we understand that the amonia stored on site has already been reduce to 20% concentration. Please notify this office imediately if this is not the case.

Sincerely, s _

s t George W. Knighton, Director Project Directorate V Division of Reactor Projects - III, IV, V and Special Projects Office of Nuclear Reactor Regulation

Enclosure:

As stated cc: See next page

Mr. Joe Firlit Rancho Seco Nuclear Generating Chief Executive Officer, Nuclear Station Sacramento Municipal Utility District 14440 Twin Cities Road Herald, California 95638-9799 cc:

Mr. David S. Kaplan, Secretary Mr. John Bartus and General Counsel Ms. JoAnne Scott Sacramento Municipal Utility Federal Energy Regulatory Commission District 825 North Capitol Street, N. E.

6201 S Street Washington, D.C. 20426 P. O. Box 15830 Sacramento, California 95813 Mr. Barclay S. Lew Pacific Gas and Electric Company Thomas A. Baxter, Esq. 77BealeStreet(333/A613)

Shaw, Pittman, Potts & Trowbridge San Francisco, CA 94106 2300 il Street, N.W.

Washington, D.C. 20037 Ms. Helen Hubbard P. O. Box 63 fir. Steven Crunk Sunol, California 94586 Manager, Nuclear Licensing Sacramento Municipal Utility District Rancho Seco Nuclear Generating Station 14440 Twin Cities Road Herald, California 95638-9799 Mr. Robert B. Borsum, Licensing Representative Babcock & Wilcox Nuclear Power Division 1700 Rockville Pike - Suite 525 Rockville, Maryland 20852 Resident Inspector / Rancho Seco c/o U. S. N. R. C.

14440 Twin Cities Road Herald, California 95638 Regional Administrator, Region V U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Mr. Jack McGurk, Acting Chief Radiological Health Branch State Department of Health Services 714 P Street, Office Building #8 Sacramento, California 95814 i Sacramento County Board of Supervisors c 700 H Street, Suite 2450 Sacramento, California 95814 l

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