ML17037C096

Letter Regarding Primary Containment Integrated Leak Rate Test and the Secondary Containment Integrated Leak Rate Test Reports as Conducted Following the Poison Curtain Removal Outage

ML17037C096
Person / Time
Site:	Nine Mile Point
Issue date:	09/15/1972
From:	Brosnan T Niagara Mohawk Power Corp
To:	Skovholt D US Atomic Energy Commission (AEC)
References
Download: ML17037C096 (4)

Text

AEC DISTRIBUTION FOR PART 0 LOCKE MATERIAL TEMPORARY FORM -

CONTROL Noo 5161'ROM:

FX Niagara Mohawk power Corp. DATE OF Docl DATE REC'D t SMO RPI'THER Syracuse, N.Y. 13202 T.J. Brosnan 9-15-72 9-19-72 TO ~ ORIG CC SENT AEC PDR

.Mr. Donald J. Skovholt SEhT LOCAL PDR 1 signed CLASS: lj OP INFO INPUT No CYS REC'D DOCKET No; DESQRIPTIO N: 'NCLOSURES:

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&LEASE CIRCULATE"INSUFFICIENT CYS FOR FULL 50-220 primary & Secondary Containment Leak Rate Test Report for Nine Mile Pt.

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,Oil<<m NIAGARA <<~ MOHAWK 300 ERIK BOULEVARD WEST SYRACUSE, N. Y, l3202 Regulatorg, !File Cyg September 15, 1972 Mr. Donald J. Skovholt Assistant Director for Reactor Operations Division of Reactor Licensing United States Atomic Energy Commission 8kp287 3 Washington, D. C. 20545 9 Szu.

Dear Mr. Skovholt:

g '~~>iDI Re: Interim Operating License: DPR-17 Docket No.: 50-220 We are forwarding you under separate cover, forty (40) copies of the summary reports of the Primary Containment Integrated Leak Rate Test and the Secondary Containment Integrated Leak Rate Test as conducted following the Poison Curtain Removal Outage at Nine Mile Point, Unit Nl, Nuclear Station this spring. These reports should comply with the requirements under paragraph 4.3.3 of the Technical Specifications.

the initial integrated leak test, performed prior to initial fuel loading, I'uring an allowable operational leak rate Lto(22) was established as 0.87% of the contained volume in 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> at 22 psig. However, with the increase in station rated power, the maximum allowable leak rate of 1.6 weight percent of contained air at 35 psig was changed to 1.5 weight percent reducing the allowable operational leak rate (Lto(22)) to 0.81% of the contained volume in 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> at 22 psig.

Since the measured test leak rate at 22 psig was only 0.66%, the containment integrity is within Technical Specifications. Inspection of the summary report for the Secondary Containment Integrated Leak Rate Test reveals that with the required differential pressure between the building atmosphere and the outside, the amount of leakage is well within the limits.

Very truly yours, T +. ~ Brosnan Vice President and

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Chief Engineer

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