ML20094J127
| ML20094J127 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 08/06/1984 |
| From: | Koester G KANSAS GAS & ELECTRIC CO. |
| To: | Hunter D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| KMLNRC-84-133, NUDOCS 8408140237 | |
| Download: ML20094J127 (1) | |
Text
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r KANSAS GAS AND ELECTRIC COMPANY THEE ELECTFbC COMPANY GLENN L MOESTEft WsCE PR E S#DEh? - NyCLE Am August 6, 1984 Mr. D.R. Hunter, Chief Reactor Projects Branch 2 g
g U.S. Nuclear Regulatory Commission Region IV 611 nyan Plaza Drive, Suite 1000 g
Qg Arlington, Texas 76011 N
KMLNRC 84-133 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) - Improper Fitting on the Main Steam Isolation Valve
Dear Mr. Hunter:
This letter provides the final 10CFR50.55(e) report concerning improper fattings found on the low pressure switch of the nitrogen accumulator for the main steam isolation valves (MSIV) at the Wolf Creek Generating Sta tion. This concern was initially reported by Messrs. Maynard and Creel of Kansas Gas and Electric Company (KG&E) to Mr. William Johnson of the Nuclear Regulatory Commission, Region IV, on October 25, 1983.
While removing teflon tape from certain fittings in the plant, an I&C technician discovered an improper fitting on the low pressure switch of a (MSIV) nitrogen accumulator. The female fitting on the switch, which was supplied as part of the valve by the vendor (Anchor-Darling),
was an AMINCO 1/4" O.D. tube connector that had (straight) threads. The male adapter fitting, also supplied by the vendor, was a 1/4" NPT pipe thread which utilized tapered threads. Use of these two unmatched fittings could have resulted in an inadequate pressure seal at the connection. Failure of this connection to hold pressure would result in a loss of pressure in the acculaulater which, in turn, would degrade the safety function of the isolation vz.lve.
An inspection of the other MSIV's and the main feedwater isolation valves revealed similar conditions in these valves. To remedy this situation, a transition piece was installed in the low pressure switch assembly of each affected valve. This corrective action has been completed, and the low pressure switch assemblies for the MSIV's and main feedwater isolation valves are now qualified for their intended use.
If you have any questions concerning this subject, please contact me or Mr. Otto Maynard of my staff.
8400140237 840006
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PDR ADOCK 05000482 Yours very truly, S
PDR GLK:bb g
xc: RCDeYoung, PO'Connor, HBundy lh 201 N. Market - WicNta, Kansas - Mail Address: PO. Box 208 I wichita, Kansas 67201 - Telephone: Area Code (316) 261-6451