ML20073A870
| ML20073A870 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 03/12/1983 |
| From: | Wells D DETROIT EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, EF2-62616, NUDOCS 8304110889 | |
| Download: ML20073A870 (2) | |
Text
_.
.Me-E Donald A. Wells umaye o;at.ty Avece
-(313 211967 2000 Second Av Edison mmenue gy March 12, 1963 EP2-62616 Mr. James G. Keppler, Regional Ackninistrator Region III U.S. Nuclear Regulatory Cmmission 799 Roosevelt Road Glen Ellyn, Illinois 60137
Subject:
Interim Report of 10CFR50.55(e) Its on Failure of Main Steam Iso-lation Valves (#56)
Dear Mr. Keppler:
This interim report on the failure of Main Steam Isolation Valves problem has been prepared to provide the current status of this prob 1m.
This it m was originally reported to Mr. P. Byron of NRC Region III by Detroit Edison's Mr. H.A. Walke Supervisor - Construction Cuality Assur-ance, on February 17, 1982.
Four (4) motor operated Main Steam Isolation Valves located in the Turbine Building had failed to operate due to inproper assembly. The packing lantern ring became cocked in the bore of the packing gland. Contributing factors to this phenomenon include: a) Improper assembly of the believille washers; b)-
over torquing of the packing follower holddown nut:: and c) the horizontal orientation of the valve stm. The observed damage was a deep galling of the shaft and minor scratching and crushed packing. In addition, the lantern ring, the packing follower and follower yoke were damaged. This improper:on-site assembly of the believille washers on the packing retainer caused the valve sts to bind, and did not allow the valve to open or close.
These isolation valves aro the third'valver in a series away from the Reactor which were added per NRC requirments. The third valves are ANSI B31.1-valves, and as such, are not'"N" stamped. They do not inhibit the safe shut-down of the Reactor.
Action rrwwended to correct this problem is as follows:
a)' Remove the.lan -
~
tern ring and replace it with additional packing; b) reduce the packing nut torque values to 250 ft.-lbs.; - c) replace the valve stem and remove rough spots on the packing follower and yoke. Smooth roughness to the point where further stm galling should not occur; and d) construct and use a stem cen-tering fixture for use during repacking operations. All'of the aforemen-tioned itms and actions nust be taken with the concurrence of the valve sup-plier.
h 8304110889 830312 U PDR ADOCK 05000341 S
PDR.
. APR; - 41983 a
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.A Mr. James G. Keppler, Regional Adninistrator March 12, 1983, Page Two EF2-62616 Another report on this its,. cither interim or final, will be 'sent.when fur-ther infonration is available. If you have questions concerning this matter, please contact Mr. G.M. Trahey, Assistant Director - Project Quality Assur-ance.
l l
Very truly yours, I
l
)J G DE/DF/pn l
cc: Mr. Richard DeYoung, Director l
Office of Inspection and Enforcement U.S. Nuclear Regulatory Ccmnission l
Washington, D.C.
20555 Mr. Bruce Little, Senior Resident Inspector U.S. Nuclear Regulatory Comission 6450 North Dixie Highway Newport, Michigan 48166 q
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