ML20212B311
| ML20212B311 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 12/19/1986 |
| From: | Agosti F DETROIT EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| IEB-85-003, IEB-85-3, VP-86-0162, VP-86-162, NUDOCS 8612290218 | |
| Download: ML20212B311 (5) | |
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December 19, 1986 VP-86-0162 Mr. Janes G. Keppler Regional Administrator Region III U. S. Nuclear Regulatory Commission 799 Ibosevelt Road Glen Ellyn, Illinois 60137
Dear Mr. Keppler:
References:
(1) Fermi 2 NIC Docket No. 50-341 NIC License No. NPF-43 (2) IE Bulletin 85-03, Motor Operated Valve Comnon Mode Failtres During Plant Transient Due to Inproper Switch Settings (3) NIOC-31322, BNR Owner's Group Report on the Operational Design Basis of Selected Safety-Related Motor Operatal Valves, Septenber 1986 (4) NIC letter to BNRO3, " Extension of BNRG3 l
Subnittal for IFB 85-03 until l
September 1,1986", dated June 8,1986 (5) Detroit Edison Ietter to NBC, " Motor-(
Operated Valve Switch Settings",
VP-86-0137, dated October 1,1986 I
Subject:
Supnienental Resoonse To IE Bulletin 85-03 l
Reference 2 identified a problem with Motor Operated Valve common mode failtres during various plant transients. 'Ihese f allures were experlenced at the Dayis l
Besse and Sequoyah, Unit 2, plants. Investigations determined the root cause to be inproper torque switch settings. Upon reviewing the subject IE Bulletin,
\\g Detroit Edison provided its response and the following SV cannitment in Reference 5:
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I, Mr. James G. Keppler December 19, 1986 VP-86-0162 Page 2 Based on the calculated maximtun differential gessure listed in Table 1, Detroit Edison will determine those torque switch settings which are enveloped by our current design basis.... Motor operated valves enempassed by Fermi 2's existing design basis and previously verified to be opertle will be identified by December,1986.
To date, Detroit Edison has confirmed that fifteen (15) of the thirty-three (33) IPCI/ICIC valves listed in reference 5, Table 1, hare been confirmed opersle based on the new, maximum, differential pressures. Table A (attached) identifies thom valves which hare been confirmed. We thermal overload sizing has been reviewed for all valves contained in the subject Table, and is docunented in, a Detroit Edison Design Calculation.
Prior to placing the identified Motor Operated Valves back into service post-maintenance testing is conducted in accordance with an apgaved maintenance procedure.
Operational tests codirm valve operability under normal operating conditions. Se operational tests are performed in accordance with Fermi 2's ISI, IST, and LLRT programs.
he valve manufacturers hare been contra:ted to review all IPCI/aCIC valves identified in reference 5, Table 1, l
to determine the ability of the valves to perform against their maximtzn differential gesstres, as required by IE Bulletin 85-03. We valve manufacturer review will include, as a double check, the fifteen valves ichntified I
in Table A.
We ntuber of utilities re;[uesting identical Motor Operated Valve reviews has created a backlog in the vendors shop. Consequently, the information needed for Detroit Edison to corfirm the acceptability of the subject valves will not be available prior to December j
31, 1986.
Detroit Edison will subnit an updated responm, providing the results of our review, as soon as the requested information has been received fran the vendors and reviewed by the Fermi 2 Nuclear Engineering department.
Detroit Edison has concluded that this extension will not impact subsequent schedules or conmitments identified in reference 5.
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Mr. Janes G. Keppler December 19, 1986 VP-86-0162 Page 3 If you have any questions regarding this matter, please contact Mr. Frank Sondgeroth at (313) 586-4270.
Sincerely, n
- M 8 cc: Mr. W. G. Rogers Mr. J. J. Stefano Mr. G. C. Wright USNIC Doctuent Control Desk Washington, D. C. 20555 i
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Mr. James Keppler December 19, 1986 VP-86-0162 Page 4 I, FRANK E. AGOSTI, do hereby affirm that the foregoing statements are based on facts and circumstances which are true and accurate to the best of my knowledge and belief.
i M[
FRANK E. AG6STI Vice President Nuclear Operations On this
/9-day of to
- 1986, before me personally appeared Frank E. Agosti, being first duly sworn and says that he executed the foregoing as his free act and deed.
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6 TABLE A IEB 85-03 MOV's Confirmed to be Within Design Basis IPCI System Valve #
ICIC System Valve #
F006 F029 F042 F031 F041 F002 F008 F012 F0ll F046 F007 F062 F001 F075 F079 i
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