ML20127G554

Ro:Three Containment Isolation Valves Found to Have Leak in Excess of TS Limit.Leakage Rate of Two Valves Reduced to within Specified Limit.Repair of Third Valve in Progress

ML20127G554
Person / Time
Site:	Monticello
Issue date:	01/18/1973
From:	Larson C NORTHERN STATES POWER CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
NUDOCS 9211170374
Download: ML20127G554 (2)

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.Y NOMTNEMN STATES POWER COMPANY Monticello, Minnesota 55362 January 18, 1973 Ur. Boyce H. Grior, Director Olroctorate of Requietory Operations Rogion 111 United States Atomic Ener6y Coma.ission 799 Boosevelt Road Glen Ellyn, Illinois 61037 Doar Mr. Grier:

.'.ONrtCELLO (UCLE R GENERAfim PLANT A

Docket. (b. 50-263 Licenso No. DPR-22 Throo containment icolation valves at the %nticolio.fbclear Generating Plant have boon found to lcak in excess of the Technical Specification limit. These butterfly valvos used ;n the containnunt vent, valves are offset dick, T-ring,lding vacuum brnakor systems.Tho leakage rate purgo, and torus-to-reactor bui of two of these valvos has been reduced to within the specified limit by adjusteent of the valvo operating linkage. Repair of the third valve is in progress.

n each case, a second isolation valve in the same line was found to have acceptable lookogo.

Invostigation of the cause of the leakage problona is in progress.

Yours very truly, C E Larson Plant Manager t0RTHERN STATES' F0flER COIPAf#

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UNITED STATCS j. 7.'

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OlVISION OF COMPLI ANCE 3

REGION lli I

disijg e 799 ROOSEVELT ROAD GLEN ELLYN, ILLINols 60137 (sta)ess 2sso i

A.

RO Inspection Report No.

I r

Transmittal Date Distribution:

Distribution:

RO Chie f, FS&EB R0 Chie f, FS&"3 RO:HQ (5)

RO: liq (4)

DR Central Files L:D/D for Fuel & Materials Regulatory Standards (3)

DR Central Files Licensing (13)

B.

RO Inquiry Report No.

Transmittal Date Distribution:

Distribution:

RO Chie f, FS&EB R0 Chie f, FS&EB 4

RO:HQ (5)

RO:HQ DR Central Files DR Central Files Regulatory Standards (3)

Licensing (13)

C.

Incident Notification From: Northern Statee Power Co.

50-263 (Licensee & Docket No. (or License No.)

Transmittal Date May 29, 1973 Distribution:

Distribution:

R0 Chie f, F5 EB R0 Chie f, FS&EB RO:HQ (4)

RO:HQ (4)

Licensing (4)

L:D/D for Fuel & Materials DR Central tuyg DR Central Files i

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