ML20214T943

Application for Amends to Licenses DPR-21 & DPR-65,limiting Offgas in-process Activity Rate to Assure That Offsite Consequences of Seismic Failure of Augmented Offgas Sys Do Not Exceed Established Criteria

ML20214T943
Person / Time
Site:	Millstone
Issue date:	02/13/1978
From:	NORTHEAST NUCLEAR ENERGY CO.
To:	Office of Nuclear Reactor Regulation
Shared Package
ML20214T944	List: ML20214T943 ML20214T954 ML20214T965
References
TAC-7355, NUDOCS 8706100488
Download: ML20214T943 (2)

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E O P.o oox 270 HARTFORD. CONNECTICUT 00101 2n656m HORTHEAST NUCLEAR ENERGY COMPANY A NORTHEAST UTIUTIEs COMPANY  !

February 13, 1978 1 i

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Docket No. 50-245_ l and 50-336 o I Director of Nuclear Reactor Regulation j Attn: Mr. G. Lear, Chief Operating Reactors Branch #3 U. S. Nuclear Regulatory Commission ]

Washington, D. C. 20555

References:

(1) D. C. Switzer letter to G.-Lear dated September 24, 1975.

(2) D. C. Switzer letter to G. Lear, transmitting Millstone Nuclear Power Station, Unit No.1. Radwaste Modifications, {

Supplement 2 August, 1975, dated August 11, 1975. J (3) D. C. Switzer letter to G. Lear, transmitting Millstone l Nuclear Power Station, Unit No.1, Status of Off-Gas Recombiner System. May, 1976. dated May 19, 1976. j (4) G. Lear letter to D. C. Switzer, transmitting Amendment No. 19 to License No. DPR-21, dated February 24, 1976.

L Gentlemen:

Millstone Nuclear Power Station, Unit Nos. 1 and 2 Steam Dilution Off-Gas Recombiner/ Augmented Off-Gas System I Proposed Environmental Technical Specification Changes Pursuant to 10CFR50.90, Northeast Nuclear Energy Company _ (NNECO) hereby proposes j to amend its operating licenses DPR-21 and DPR-65 by incorporating the attached changes into the Environmental Technical Specifications for Millstone Nuclear Power Station, Units No. 1 and 2. The changes will limit the off-gas in-process  ;

activity rate to assure that the off-site consequences of the seismic failure of the augmented of f-gas system do not exceed established criteria. The attached  !

report entitled, " Steam Dilution Off-Gas Recombiner/ Augmented Off-Gas System",

provides the safety analysis to support the proposed specification. This report also provides a system description to aid in the understanding of the safety analysis.

In Reference (1), a technical specification was proposed for the seismic failure  :

of the original augmented off-gas system, based upon the analysis presented in ,

Reference (2). Since that time, however, the augmented of f-gas system has been modified by replacing the defunct air recycle off-gas recombiner system (discussed in Reference (3)) with a steam dilution of f-gas recombiner system, described in the  !

attached report. This fundamental change in design, and the associated changes

' in off-gas system arrangement, are significant enough to require a new safety j analysis. j 8706100488 780213 PDR, ADOCK 050002451 j PDR

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i STATE OF CONNECTICUT )

COUNTY OF HARTFORD

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. Then personally appeared before me D. C. Switzer, who being duly sworn, did state that he is President of Northeast Nuclear Energi Company, a l

. Licensee herein, that he is authorized to execute and file the foregoing information in the name and on behalf of the Licensees herein and that the statements contained in said information are true and correct to the best of his knowledge and belief.

A t n . E k 2 n .>

Notary Public ' ,

My Commission bpires March 31,1931

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