ML20011A044

Interim Deficiency Rept Re Fisher Control Valves,Initially Reported 801231.Investigation Is Underway to Determine Natural Frequencies of Piping Sys.Specs Will Be Updated. Next Rept Will Be Submitted by 811228

ML20011A044
Person / Time
Site:	Fermi
Issue date:	09/25/1981
From:	Wells D DETROIT EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
10CFR-050.55E, 10CFR-50.55E, EF2-54146, NUDOCS 8110060390
Download: ML20011A044 (2)

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Mr. James G. Keppler, Director Region III U.S. Nuclear Regulatory Ccmniscion 799 Roosevelt Road Glen Ellyn, Illinois 60137

Subject:

Interim Report on 1GCFR50.55(e) Item on Fisher Control Valves (#37)

Dear Mr. Keppler:

This additional interim report on the Fisher Cortrol Valve probim has been prepared to provide you with the current status of this probim.

This item was originally wported to Mr. R. Knop of NRC-Region III by Detroit Edison's Mr. H.A. Walker, Supervisor-Construction Quality Assurance on Dec-ember 31, 1980. At that tire it had been determined that there was a problem with Fisher Control Valves at the Fermi 2 Site.

Control valves were purchased frm Fisher Controls accarding to Detroit Edison specifications. During the purchase of additional valves, Detroit Edison Design Engineering determined that cut-off f"quencies had not been specified to assure that seismic design of the valves accounted for the Fermi 2 peak response frequency. It has been subsequently determined that a design def-iciency exists.

An investigation has been initiated to determine if the control valves can be qualified by determining the natural frequencies of the piping systems withic.

which these valves are installed. A time history analysis is being perforned on each pipe systm configuration containing the control valve to c1%blish the frequency of the system. If the natural frequency of the control valve is established to be above the piping system natural frequency, the valve will be accepted and qualified. In parallel to the engineering investigation, the specifications will be updated and quotations for new valves will be sought and purchase initiated as necessary, edher report on the item, either interim or final, is scheduled to be sent to you on or before December 28, 1981.

If you have questions concerning this matter, please contact Mr. H.A. Walker, Supervisor-Construction Quality Assur-an:e.

Very truly yours, M

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6r O 8110060390 810925 PDR ADOCK 05000341 S

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Mr. James G. Keppler, Director Sept & 25, 1981 j

Page 'No EF2-54146 1

4 cc: Mr. Victor Stello, Jr., Director l'

Office of Inspection and Enforcement i

Division of Reactor Inspection Programs l

U.S. Nucir.tr Root:1atory Comnission i

Washingtcn, u.C. 20555 i

Mr. Bruce Little, Resident Inspector U.S. Nuclear Regulatory Ccanission Resident Inspectors Office i

6450 North Dixie Highway 4

i Newport, Michigan 48166 1

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