ML20095B681
| ML20095B681 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 08/08/1984 |
| From: | Koester G KANSAS GAS & ELECTRIC CO. |
| To: | Hunter D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| KMLNRC-84-137, NUDOCS 8408220217 | |
| Download: ML20095B681 (2) | |
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KANSAS GAS AND ELECTRIC COMPANY THE ELECTFNC COMPANY G L E N f4 L MOESTER vict PaastDENT NUCLEAR August 8, 1984 Mr. D.R. Hunter, Chief hhhh Reactor Project Branch 2 U.S. Nuclear Regulatory Commission Region IV AUG l 31984 611 Ryan Plaza Drive, Suite 1000 p
Arlington, Texas 76011
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KMLNRC 84-137 Re:
Docket No. STN 50-482 Ref: Interim Report KMLNRC 84-108 dated 7/5/84 from GLKoester, KG&E, to EHJohnson, NRC Subj: Final Report, Potential 10CFR50.55(e) - Ducting Installation in the Torsion Restraint Area
Dear Mr. Hunter:
This letter provides the final report on a potantial 10CFR50.55(e) con-cerning ducting installation in the torsion restraint area at Wolf Creek Generating Station. This matter was initially reported by Messrs. Chernoff and Rudolph of Kansas Gas and Electric Company (KG&E) to Mr. Johns Jaudon of the Nuclear Regulatory Commission, Region IV, on November 10, 1983.
During the investigation of an allegation, a potential safety concern was identified in the torsion restraint area. Some of the bolts used to assemble the ducting pieces appaared bent and had thread damage due to interference with the companion flange mounting holes. Also, one of the duct pieces had been modified by partially cutting and rewelding the end to make the piece fit into its flange. The ducting is not safety-related, but there was a concern that if the ducting failed structurally during a seismic event, it could fall and potentially damage safety-related equipment.
An investigation into this matter revealed that an excessive tightening force was the probable cause of the damaged bolts. The damaged bolts were replaced, and the Construction and Startup organizations were directed to visually inspect all HVAC installations and replace any visibly bent bolts. The single modified duct piece was inspected and was found to be 8408220217 840808 PDR ADOCK 05000482 S
PDR 1677 201 N. Market -WicNta, Kansas -Mail Address: RO. Box 208 I WicNta, Kansas 67201 - Telephone: Area Code (316) 261-6451
b Mr. D.R. Hunter KMLNRC 84-137 August 8, 1984 welded satisfactorily to its flange. These corrective actions ensure that the ducting will not fail structurally during a seismic event, thus preventing the damage of any underlying safety-related equipment. If you have any questions concerning this matter, please contact me or Mr. Otto Maynard of my staff.
Yours very truly, du Glenn L. Koester Vice President - Nuclear GLK:bb xc: RCDeYoung PO'Connor HBundy i
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