ML20040F028

Application for Amend to Licenses DPR-42 & DPR-60,consisting of Changes to Tech Spec 4.4.A.5.C Re Containment Airlock Leakage

ML20040F028
Person / Time
Site:	Prairie Island
Issue date:	02/01/1982
From:	Mayer L NORTHERN STATES POWER CO.
To:
Shared Package
ML20040F025	List: ML20040F024 ML20040F028 ML20040F030
References
NUDOCS 8202080223
Download: ML20040F028 (3)

Text

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r UNITED STATES NUCLEAR REGULATORY COMMISSION NORTHERN STATES POWER COMPANY PRAIRIE TSLAND NUCLEAR GENERATING PLANT Docket No. 50-282 50-306 REQUEST FOR AMENDMENT TO OPERATING LICENSE NO. DPR-42 & DPR-60 (License Amendment Request Dated February 1,1982)

Northern States Power Company, a Minnesota corporation, requests authorization for changes to the Technical Specifications as shown on the attachments labeled Exhibit A and Exhibit B. Exhibit A describes the proposed changes along with reasons for the change. Exhibit B is a set of Technical Specification pages incorporating the proposed changes.

This submittal contains no restricted or other defense information.

NORTHERN STATES POWER COMPANY By V

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n ManagerofNuclearSupp/ ort Services On this /c / day of dW#, /[k, before me a notary public in and for said County, personally 4ppeared L 0 Mayer, Manager of Nuclear Support Services, and being first duly sworn acknowledged that he is authorized to execute this document on behalf of Northern States Power Company, that he knows the contents thereof and that to the best of his knowledge, information and belief, the statements made in it are true and that it is not interposed for delay.

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I EX?IIBIT A Prairie Island Nuclear Generating Plant License Amendment Request daced February 1,1982 Proposed Changes to the Technical Specifications Appendix A of Operating Licenses DPR-42 and DPR-60 Pursuant to 10 CFR 50.59 and 50.90, the holders of Operating License DPR-42 and DPR-60 hereby propose the following changes to Appendix A, Technical Specifications:

Specification 4.4.A.S.c, Containment Airlock Leakage Proposed Change Revine Specification 4.4.A.S.c to read:

c. For airlocks, the leakage shall be less than 256 seem at 10 psig for door intergasket tests and 1500 seem at 46 psig for overall airlock tests.

Reason for Change The existing Technical Specification requires airlock leakage to be,

". ..less than the design leakage reported in ' Supplement No. I to Unit 1 Reactor Containment Building Integrated Leak Rate Test - June, 1973', dated June, 1974." This allowable leakage is 256 sec/ min for airlock door seal tests and 409 sec/ min for overall airlock tests.

Airlock shaft seals are in the process of being replaced with new material which is qualified for the design basis accident conditions recommended in NUREG-0578 and NUREG-0737. Modifications to Unit No. I airlocks have been completed. Unit No. 2 airlocks will be modified during the 1982 refueling outage. The new Grafoil seals have been found to have leakage characteristics higher than the original seals. Compliance with the allowable leakage limit, which was established for the original seal material, may not be possible. The original limits were very conservative.

We believe there is a potential for unnecessary plant shutdown and cooldown if airlock tests during plant operation fail to meet acceptance criteria based on the old seal material. We therefore propose that the allowable leakage for overall airlock tests be increased to 1500 sec/ min. This leakage is still acceptably small while providing a comfortable margin to the expected leakage characteristics of the modified shaft seals. Initial tests indicated leakage of 150- 250 sec/ min for new seals.

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EXHIBIT A

-2 It should be noted that the Appendix J requirements for total Type B and Type C leakage remain unchanged in the Technical Specifications. The limit on airlock leakage in the Prairie Island Technical Specifications is an additional requirement. It applies primarily to airlock testing conducting between refueling outages when other Type B and Type C tests are not conducted and a total cannot be computed.

Safety Evaluation The requested allowable leakage for overall airlock tests is 1500 sec/ min.

This is a small fraction of the allowable total for Type B and C tests of 0.6L (154,800 sec/ min). Appendix J requirements for total Type B and Type *C leakage (which includes the airlocks) will remain satisfied, r

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