ML20080K903

Suppls 831025 Application for Amend to Licenses DPR-24 & DPR-27,consisting of Tech Spec Change Request 94 Re Criteria for Type a Integrated Leak Rate Testing

ML20080K903
Person / Time
Site:	Point Beach
Issue date:	02/07/1984
From:	Fay C WISCONSIN ELECTRIC POWER CO.
To:	Harold Denton, John Miller Office of Nuclear Reactor Regulation
Shared Package
ML20080K907	List: ML20080K903 ML20080K930 ML20080K951
References
NUDOCS 8402160181
Download: ML20080K903 (110)

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Wisconsin Elecinc mara courasr 231 W. MICHIGAN, P.O. BOX 2046. MILWAUKEE, WI 53201 February 7, 1984 Mr. H. R. Denton, Director Office of Nuclear Reactor Regulation U. S. NUCLEAR REGULATORY COMMISSION Washington, D. C. 20555 Attention: Mr. J. R. Miller, Chief Operating Reactors, Branch 3 Gentlemen:

DOCKET NOS. 50-266 AND 50-301 MODIFICATION TO TECHNICAL SPECIFICATION CHANGC REQUEST NO. 94 CRITERIA FOR TYPE "A" INTEGRATED LEAK RATE TESTING PCINT BEACH NUCLEAR PLANT, UNITS 1 AND 2 In a letter dated October 25, 1983 Wisconsin Electric Power Company, licensee for the Point Beach Nuclear Plant, submitted a license amendment application to incorporate changes into the Technical Specifications in order to meet the containment integrated leakage testing requirements of Appendix J to 10 CFR 50. Enclosed is a modification to that change request which revises some of these acceptance criteria for the duration of Type "A" integrated leakage rate tests (ILRT). The changes proposed herein stem from the differences in these EPRI project criteria between the draft report and the final publication version which was updated in the interim period between the respective issuance dates. These changes are considered minor clarifications but essential to the precision of these criteria and the accuracy of our Technical Specifications.

Accordingly, these criteria from the final publication are substituted for those presented in the initial proposed Technical Specifications.

Additionally, the justification / explanation relevant to this subject was removed from the previous proposed Technical Specification text bases and is presented as follows.

On February 1, 1973 the Atomic Energy Commission (AEC) approved the Bechtel Corporation Topical Report BN-TOP-1, entitled

" Testing Criteria for Integrated Leakage Rate Testing of Primary 8402160181 840207 _1_ \

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. Mr. H. R. Denton February 7, 1984 Containment Structures for Nuclear Power". This report provides for test performance of less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> using the absolute method, total time technique. Since that time, no other technique has been " approved" even though a superior technique has been accepted for use by the NRC.

The absolute method, mass point technique is current 2y used at about 90% of the testing U. S. nuclear power plants. The rationale for this is that it is a statistically superior technique which yields a more representative result than the total time technique. This has been documented in various publications since the mid-1970's. It is the preferred technique of the ANS 56.8 Standard which is the most current industry document. Further, at the Scottsdale ANS R&D conference, Bechtel representatives concurred with the unanimous consensus (consisting of both industry and NRC attendees) that the mass point technique was the preferred technique.

A further refinement to the mass point technique was developed by Quadrex Corporation under EPRI Project 1393-5.

EPRI Report NP-3400 published in December 1983 delineates these criteria for determining the duration of an ILRT. In the report, a base of 53 previously performed ILRT's was used to validate these criteria of which 47 ILRT's could have been successfully terminated prior to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> using these criteria. To date, over 150 ILRT reports (about a 50% sample cf all U. S. nuclear power plant ILRT's) have been used and these criteria have continued to be proven valid. The ANS 56.8 Working Group is currently reviewing this report in consideration of incorporating the report into a revision of the standard.

It is Licensee's desire to perform the ILRT in less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> using the preferred mass point technique with its most current validated refinement or the 1973 AEC approved Bechtel Topical Report (in keeping with the NRC's current position). The Technical Specifications, as proposed, would permit this option.

As stated in our October 25 submittal, these revisions to the Specifications have no safety or environmental significance which has not been previously considered and approved by the Commission staff. Accordingly, the pages submitted herein cancel and supersede those like numbered pages submitted with my October 25 letter.

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. Mr. H. R. Denton February 7, 1984 Enclosed are three originals and forty copies of this

-modification to our license amendment request, including the proposed Technical Specification pages. Also enclosed are two ,

copies of the referenced EPRI NP-3400 December report. Please contact us if you have any questions concerning this submittal.

Very truly yours, Q

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Vice Pres'ident-Nuclear Power C. W. Fay Enclosures Copies to NRC Resident Inspector C. F. Riederer, PSCW Subscribed and sworn to before me this % day of February 1984.

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Notary PuFc," State of Wisconsin My Commission expires /,/ O/.

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