ML20037C806
| ML20037C806 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 01/29/1981 |
| From: | Hines E DETROIT EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, EF2-49-878, NUDOCS 8102230557 | |
| Download: ML20037C806 (2) | |
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January 29, 1981
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Mr. Jam 2s G. Keppler, Director
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Regicn III cowau58" U.S. I uclear Regulatory Ccenissicn %
iN**'O' 799 Roosevelt Road
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Glen Ellyn, Illinois 60137
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Subject:
Interim Report en 10CFR50.55(e) Item cn Fisher Ccntrol Valves (#37).
Dear Mr. Keppler:
On Decc=ber 31, 1980, Detroit Ediscn's Mr. H.A. Walker, Superviscr-l Ccastruction Ctaality Assurance, telephoned Mr. R. Knop of the NRC -
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Regicn III to report en a prchle:n with Fisher Centrol Valves at the I
l Fe mi 2 Site.
I Control Valves were purchased frcrn Fisher Ccatrols according to Detroit l
Ediscn specifications. During the purchase of additional valves, Detroit j
l Edison Design Engineering dac=ined that cut-off frequencies had not l
l been specified to assure that seismic design of the valves accounted for I
l the Fcci 2 peak respcnse frcquency. It has been subsequently determined l
l that a design deficiency c::ists.
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l Description of Ceficiency Centrol Valves purchased frce Fisher Centrols were specified withcut providing a cut-off frequency for seismic analysis.
In subsequent discussicns with Fisher Controls, it was requested that Fisher review all Fisher supplied safety related control valves for minimum resonant frequencies. Based on this analysis, it was dete=ined that ten (10).
l valves have natural frequencies helcw thirty-three (33) hz. The resultant l
l stress IcVels that tha actuator Ecnnet assembly are subjected to during j
a basis event could cause valve failure and pressure integrity rupture.
Acticn Taken An investigation has been initiated to dete=ine if the control valves can be qualified by detemining the natural frequencies of the piping systers within which these valves are installed. A tire history analysis will be perforred en each pipe system configuration centaining the control valve to establish the natural 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 to accepted as 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.
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Mr. Jares G Keppler, Director January 29, 1981 Page Two EF2-49,878 s
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A final report is schedule.2 to be subnitted to ycu by May 15, 1981.
If 1
you have questicns ccncerninJ this ratter, please contact Mr. H.A. Walker, Supervisor Constructier Quality Assurance.
Very truly yours, M li l&
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Df/ HAW /cp cc: -Mr. Victor Stello, Jr., Director Office of Inspectica and Fr.ferecr.ent Division of Reactcr Inspection Prgrr.3 U.S. Nuclear Regulatcry Cctri.ssicn Washingten,. C.
20555 t
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Mr. Bruce Little, Resident Inspector U.S. Nuclear Regulatory Crissicn Resident Inspectors Office 6450 North Dixie Highway Ne'.q;crt, Michigan 481t56
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