ML20028A979

Interim Deficiency Rept Re Westinghouse 3-inch Motor Operated Valves.Valve Mods Include Changing Operator Gear Ratio,Changing Operator from Limitorque SMB-000 to SB-00 & Implementing Limit Closing Control

ML20028A979
Person / Time
Site:	Seabrook
Issue date:	05/01/1981
From:	Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
10CFR-050.55E, 10CFR-50.55E, SBN-159, NUDOCS 8211290275
Download: ML20028A979 (3)

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1671 Worcester Road Framingham, MA 01701 May 1, 1981 SBN-159 T.F. B 4.2.7 U.S. Nuclear Regulatory Connission Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 Attention: Office of Inspection and Enforcement

References:

1. Docket No. 50-443 and 50-444 ,

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2. PSNH letter SBN-140, dated 12/1/80

Subject:

Reportable 10 CFR 50.55 (c) Item - Westinghouse 3 Inch Motor Operated Valves

Dear Sir:

C Reference 2, an interim report, identified that a testing program was in progress to idcntify the cause and corrective action to be taken for the reportable problem with Westinghouse 3 inch motor operated valves.

The engineering valve test program was comprised of a series of flow tests performed in a hydraulic test laLoratory using a centrifugal charging pump to provide flow and pressure. These te,sts consisted of 75 to 100 closing and opening cycles against flows and pressures as high as 600 gpm and 2600 psid, respectively. These cycles provided the expected valve seat to disk wear which resulted in stabilized valve closing loads. Once the stabilized level was reached, closing tests were run at lower flows and differential pressures to determine the extent of the closure problem.

Modifications for the three inch valves have been qualified by testing. These modifications are as follows:

B211290275 810501 PDR ADOCK 05000443 S PDR

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UfS. Nuclear Regulatory Conmission Page 2.

SBN-159 3GM88 - 1. Change the operator gear ratio to insure 80%

voltage closing capability.

2. Implement limit closing control utilizing the capabilities of the spring campensators on the limitorque SB-00 operators.

3GM99 - 1. Change the operator from limitorque SMB-000 to SB-00.

2. Implement limit closing control.

These modifications will be made at Seabrook Station prior to Fuel load.-

Very truly yours, tk ,,

John DeVincentis Project Manager HEW: tan ,

cc: Director of Inspection & Enforcement U.S. NRC, Washington, D.C. 20555 I

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