ML20050B317
| ML20050B317 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 03/24/1982 |
| From: | Wells D DETROIT EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, EF2-57153, NUDOCS 8204050199 | |
| Download: ML20050B317 (1) | |
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|---|---|
Category:DEFICIENCY REPORTS (PER 10CFR50.55E & PART 21)
MONTHYEARNRC-97-0141, Deficiency Rept Re Malfunction of EDG Number 11 Automatic Voltage Regulator (AVR) Printed Circuit Board Rev B,Due to Failure of Operational Amplifier U8 Chip.Avr Board Rev B Was Sent Offsite to Independent Engineering Facility1997-12-23023 December 1997
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, Donald _A. Wells
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March 24, 1982 e
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EF2-57153 y
Region III k
/Yg II/g Mr. James G. Keppler, Director M
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U. S. Nuclear Regulatory Commission
'(g 08g& ]7 799 Roosevelt Road I2 Glen Ellyn, IL 60137
Dear Mr. Keppler:
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Subject:
Interim Report of 10CFR50.55(e) Item on Failure Main Steam Isolation Valves (#50)
On February 17, 1982, Detroit Edison's Mr. H. A. Walker, Supervisor-Construction Quality Assurance, telephoned Mr. P. Byron of NRC Region III to report on a problem with failure of Main Steam Isolation V.-Lves at the Fermi 2 site.
Four motor operated Main Steam Isolation Valves located in the Turbine Building had failed to operate due to improper assembly. This improper on-site ascembly of the Belleville washers on the packing retainer caused the valve stem to bind and did not allow the valve to open or close. These isolat 'on valves are the third valves in the series away from the iteactor which were added per NRC requirements.
Detroit Edison is investigating the cause of the improper assembly and wi.11 take the necessary corrective action of training of personnel and/or changing of procedures covering the valve assembly to prevent recurrence of the problem.
Another report on this item, either interim or final, is scheduled to be sent to you on or before July 16, 1982.
If you have questions concerning this matter, please' contact Mr.11. A. Walker, Supervisor-Construction Quality Assurance.
Very truly yours, p%
Y)) k' IIAW:mb cc:
Mr. Richard DeYoung, Director
. Office of Inspection aad Enforcement Division of Reactor Inspection Programs U. S. Nuclear Regulatory Commission Washington, DC 20555 Mr. Bruce Little, Resident Inspector U. S. Nuclear Regulatory Commission S
' O 6450 North Dixic liighway Newport, MI 48166
!SE 2 0 I982 8204050199 820324 PDR ADOCK 05000341
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