ML20116K698

Requests NRC Approval to Use 100%/day Inleakage Rate & Associated Drawdown Time as Acceptance Criteria for Preoperational & Periodic Testing of Filtration Recirculation Ventilation Sys,Per FSAR Section 6.2.3.3

ML20116K698
Person / Time
Site:	Hope Creek
Issue date:	05/01/1985
From:	Mittl R Public Service Enterprise Group
To:	Schwencer A Office of Nuclear Reactor Regulation
References
NUDOCS 8505030360
Download: ML20116K698 (2)

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• Company Electric and Gas 80 Park Plaza, Newark, NJ 07101/ 201430-8217 MAILING ADDRESS / P.O. Box 570, Newark, NJ 07101 Robert L. Mitti General Manager Nuclear Assurance and Regulation May 1, 1985 Director of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission 7920 Norfolk Avenue Bethesda, MD 20814 Attention: Mr. Albert Schwencer, Chief Licensing Branch 2 Division of Licensing Gentlemen:

REACTOR BUILDING NEGATIVE LEAK RATE TEST CRITERION HOPE CREEK GENERATING STATION DOCKET NO. 50-354 The HCGS reactor building and its penetrations are designed to limit the leakage rate into the building to 10 percent of the buildings free volume per day with a negative internal pressure of 0.25 inches water gauge. Based on the 10 per-cent per day design inleakage criteria, the drawdown of the reactor building pressure by the Filtration Recirculation Ventilation System (FRVS) is completed within approximately the first 168 seconds following a LOCA.

The drawdown times and doses associated with a reactor building inleakage of 100 percent per day have been eval-uated for HCGS. The results of these analyses, provided in FSAR Sections 6.2.3.3 and 15.6.5.5.3, demonstrate that with a reactor building inleakage rate of 100 percent per day the resulting doses would be less than the allowable limits of GDC 19 and 10CFR100. Based on the results of these analyses the HCGS Draft Technical Specifications, submitted for NRC

review on January 17, 1985, provide surveillance require-l ments for the FRVS (Technical Specification Section 3/4.6.5)

, that verify at least once per 18 months that the four FRVS l vent units will drawdown the reactor building to greater than or equal to 0.25 inches of vacuum water gauge in less i

than or equal to 375 seconds and that the FRVS, operating for four hours, maintains greater than or equal to 0.25 inches vacuum water gauge in the reactor building at an exhaust rate not exceeding 3324 CFM. The reactor building drawdown time of 375 seconds and exhaust rate of 3324 CFM are based on a 100 percent per day reactor building inleakage. g _yy 8505030360 850501 PDR ADOCK 05000354 48[ [ ged% I gg$

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Director of Nuclear Reactor Regulation 2 5-1-85 The HCGS Safety Evaluation Report (SER) Section 6.2.3 documents the commitment to verify the design inleakage rate and drawdown time by preoperational and periodic tests. It is PSE&G's position that establishing the reactor building design inleakage rate of 10 percent per day and the asso-ciated drawdown time as acceptance criteria for preopera-tional and periodic tests of the FRVS is overly conserva-tive. As the analyses referenced above indicate that the consequences-of assuming a 100 percent per day reactor building inleakage rate are acceptable, PSE&G respectfully requests NRC concurrence on using a 100 percent per day inleakage rate and associated drawdown time as the accep-tance criteria for preoperational and periodic testing of the FRVS.

We are available to discuss at the earliest opportunity any questions or concerns you may have in this regard.

Very truly yours, I

C D. H. Wagner USNRC Licensing Project Manager A. R. Blough USNRC Senior Resident Inspector IG 32 1/2