ML20101F562

Forwards Summary of Testing & Feedback Status for GL 89-10 Butterfly Valves

ML20101F562
Person / Time
Site:	Davis Besse
Issue date:	03/20/1996
From:	Stetz J CENTERIOR ENERGY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
1-1096, GL-89-10, NUDOCS 9603260062
Download: ML20101F562 (3)

Text

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l CENTERf0R ENERGY 300 Moden Avenue Jelin P. Seet Toledo. OH 43652 0001 Vice Presidenf. Nuclear 419-249-2300 Dowls 8 esse Docket Number 50-346 License Number NPF-3 Serial Number 1-1096 March 20, 1996 United States Nuclear Regulatory Commission Document Control Desk Washington, D. C.

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Subject:

Summary of Davis-Besse Testing Plans and Results Feedback for Generic Letter 89-10 Butterfly Valves Gentlemen:

l The Nuclear Regulatory Commission (NRC) conducted an announced inspection of the Davis-Besse Generic Letter (GL) 89-10 program December 11-15, 1995. Additional information related to testing

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of butterfly valves at Davis-Besse has been requested by the NRC.

Specifically, a summary of butterfly valve testing plans and a description of the mechanism for consideration of test results on valve setup and periodic verification has been requested.

By the end of the Tenth Refueling Outage, scheduled to begin in April, 1996, Davis-Besse intends to have completed diagnostic testing under at least static conditions for all butterfly valves in the GL 89-10 program. Diagnostic testing includes motor power measurement and/or torque measurement. Torque measurements will be obtained where practical on a selected group of valves. The performance of those valves for which torque is not measured will be evaluated by comparison of motor power results with those valves for which torque is measured.

The number of valves for which torque measurements will be obtained will at a minimum met:t the guidance of Supplement 6 to GL 89-10, as related to grouping of valves. Davis-Besse has seven groups of j

butterfly valves, with each group containing two, four, or eight valves. At a minimum, torque measurements will be obtained for both valves in two-valve groups, at least two valves in four-valve groups, and at-least three valves in eight-valve groups.

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Docket Number 50-346 License Number NPF-3 Serial Number 1-1096 Page 2 l

Initial evaluation of test results will be completed prior to returning l

tested valves to service.

Feedback of test results for impact on I

torque calculations and input into the periodic verification program will be completed in accordance with previously established program guidelines by August 30, 1996.

l The attached Table 1 summarizes the current status of GL 89-10 butterfly valve testing and feedback activities.

l Should you have any questions or require additional information, please contact Mr. James L. Freels, Manager - Regulatory Affairs, at (419) 321-8466.

Very truly yours, t

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B / A/ll Attachment l

cc:

L. L. Gundrum, NRC Project Manager l

H. J. Miller, Regional Administrator, NRC Region III S. Stasek, DB-1 NRC Senior Resident Inspector Utility Radiological Safety Board l

Dock *et Number 50-346 License Number NPF-3 Serial Number 1-1096 Attachment Table 1: Summary of Testing and Feedback Status for GL 89-10 Butterfly Valves VALVE GROUP MOTOR POWER TORQUE RESULTS MEASURED MEASURED FEEDBACK Static DP Static DP 4

CCl407A i

10R N

N N

Note 1 CCl407B 1

10R 10R 10R 10R Note 1 CCl411 A i

10R N

N N

Note 1 CCl411B I

10R 10R 10R 10R Note 1 CV5037 2

Y N/A Y

N/A 10R CV5038 2

Y N/A Y

N/A 10R CV5065 2

Y N/A Y

N/A 10R CV5090 2

Y N/A Y

N/A 10R CV5070 3

10R Note 2 10R Note 2 Post 10R CV5074 3

10R Note 2 10R Note 2 Post 10R CV5071 4

10R Note 2 10R' Note 2 Post 10R CV5072 4

10R Note 2 10R' Note 2 Post 10R CV5073 4

10R Note 2 10R' Note 2 Post 10R CV5075 4

10R Note 2 10R' Note 2 Post 10R CV5076 4

10R Note 2 10R*

Note 2 Post 10R CV5077 4

10R Note 2 10R*

Note 2 Post 10R CV5078 4

10R Note 2 10R' Note 2 Post 10R CV5079 4

10R Note 2 10R' Note 2 Post 10R SW1382 5

Y N/A Y

N/A 10R SW1383 5

Y N/A Y

N/A 10R SW1395 6

Y Y

Y Y

Y SW1399 6

Y Y

Y Y

Y

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SW2929 7

Y N/A Y

N/A Y

SW2930 7

Y N/A Y

N/A Y

SW2931 7

Y N/A Y

N/A Y

j SW2932 7

Y N/A Y

N/A Y

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• Torque will be measured on a minimum of three valves in this group Note 1: The test results obtained from 10RFO will be used to confirm current torque calculations. His l

feedback effort will be completed by August 30,1996. Motor power measurements were obtained previously on all four valves, and torque measurements were obtained under static and dynamic conditions for CCl407B and CCl41IB.

Note 2: nese are the Containment Vacuum Breakers. The static test conditions closely approximate the design basis conditions for these valves. Thus, a DP test would provide no meaningful results l

beyond those obtained from a static test.

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Y: Indicates test has been completed l

N: Indicates test will not be performed N/A: Indicates DP iest is not practicable 10R: Tenth Refueling Outage l

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