ML20028B127

Forwards Revised Response to 820426 Request for Addl Info 440.117 Re Effects of Loss of Safety Injection Pumps on Eccs.Encl Response Will Be Included in Amend 48 to OL Application

ML20028B127
Person / Time
Site:	Seabrook
Issue date:	11/24/1982
From:	Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE, YANKEE ATOMIC ELECTRIC CO.
To:	Knighton G Office of Nuclear Reactor Regulation
References
SBN-384, NUDOCS 8211300051
Download: ML20028B127 (3)

Text

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SMME STATION L-6.._i., Office:

IPUBLIC Companyof New BERVICE Hempehre 1671 Worcester Road Framingham, Massachusetts 01701 (617) - 872 8100 November 24, 1982 SBN-384 T.F. B7.1.2 United States Nuclear Regulatory Commission Washington, D. C. 20555 Attention: Mr. George W. Knighton, Chief Licensing Branch No. 3 Division of Licensing

References:

(a) Construction Permits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 (b) USNRC Letter, dated April 26, 1982, " Request for Additional Information - Seabrook Station, Units 1 and 2,"

F. J. Miraglia to W. C. Tallman (c) PSNH Letter, dated September 21, 1982, " Response to 440 Series RAIs; (Reactor Systems Branch)

Subject:

Revised Response to RAI 440.117; (Reactor Systems Branch)

Dear Sir:

We have enclosed a revised response to the subject Request for Additional Information (RAI) which was forwarded in Reference (b).

The original response to RAI 440.117 was submitted in Reference (c).

'Ihe enclosed response will be included in OL Application Amendment 48.

Very truly yours, ANKEE ATOMIC ELECTRIC COMPANY (h

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N Project Manager ALI/fsf y cc: Atomic Safety and Licensing Board Service List

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ASLS SERVICE-LIST Philip Ahrens, Esquire .

Assistant Attorney Cencral Department of the Attorney General Augusta, ME 04333 Representative Beverly Hollingworth Coastal Chamber of Commerec 209 Winnacunnet Road Hampton, NH 03842 William S. Jordan, III, Esquire Harmon & Weiss 1725 I Street, N.W.

Suite 506 Washington, DC 20006 E. Tupper Kinder, Esquire Assistant Attorney General Office of the Attorney Cencral 208 State House Annex Concord, NH 03301 Robert A. Backus, Esquire 116 Lowell Street P.O. Box 516 Manchester, NH 03105 Edward J. McDermott, Esquire Sanders and McDermott Professional Association 408 Lafayette Road Hampton, NH 03842 Jo Ann Shotwell, Esquire Assistant Attorney General Environmental Protection Bureau Department of the Attorney General One Ashburton Place, 19th Floor Bo s t on , M A 02108

440.117 Your response to Q440.48 is not sufficient. Provide justification for the statement that " loss of the safety injection pump would not degrade ECCS operation to an unacceptable level" or confirm that the common header of the miniflow lines for two safety injection pumps will be designed to maintain its integrity af ter a postulated SSE) or confirm that a single failure in the combined miniflow line (failing closed of the single isolation valve as well as integrity after a postulated SSE) will not result in damage to the two safety injection pumps.

RESPONSE: The statement that the loss of SI pumps would not degrade ECCS operation to an unacceptable level is essentially correct in the context of the response to Q440.48, part b. The SI pumps would not be available if miniflow isolation were necessary when the RCS pressure is above the SI pumps discharge head. Small break LOCA's with breaks less than or equal to 3/8" equivalent diameter will not result in RCS depressurization below the SI pump shutoff head, and the SI pumps would have to be stopped in the event that the non-seismic miniflow header failed. However, small LOCA's with an equivalent diameter of 3/8" or less are considered leaks and the charging flow from the volume control system is capable of replacing the lost inventory. Small LOCA's with equivalent break diameters larger than 3/8" will result in RCS depressurization below the SI pump shutoff head and avert the need to stop the SI pumps. Hence, ECCS operation would not be impaired for LOCA's.

Additionally, the common recirculation header for the safety injection pumps has been seismically analyzed and is seismically supported.

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