ML20082M842
| ML20082M842 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 11/23/1983 |
| From: | Koester G KANSAS GAS & ELECTRIC CO. |
| To: | Gagliardo J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, KMLNRC-83-152, NUDOCS 8312060300 | |
| Download: ML20082M842 (2) | |
Text
e KANSAS GAS AND ELECTRIC CGMPANY vm etecmc cowmv etrum t norsten November 23, 1983 WIC E PRE SIDf fe? - DeUCLE AR f SI:
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Mr. J. E. Gagliardo, Acting Chief k
Reactor Projects Branch 2 Oi QJ\\/ <
U.S. Nuclear Regulatory Commission
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Region IV W "-
611 Ryan Plaza Drive, Suite 1000
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Arlington, Texas 76011
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KMLNRC 83-152 Re:
Docket No. STN 50-482 Subj: Interim 10CFR50.55(e) Report - Improper Fitting on the Main Steam Isolation Valve
Dear Mr. Gagliardo:
This letter provides an interim report on a 10CFR50.55(e) matter concerning improper fittings found on the low prescure switch of the nitrogen accumulator for the main steam isolation valves (MSIV) at Wolf Creek Generating Station.
This concern was initially reported by Messrs. Maynard and Creel of Kansas Gas and Electric Company to Mr. William Johnson of the Nuclear Regulatory Commission (Region IV) on October 25, 1983.
During the process of removing teflon tape from certain fittings in the plant, the I&C technician doing the work discovered that a fitting on the low pressure switch of the nitrogen accumulator was not the proper fitting. The ferale 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 with parallel threads where the pressure setal is not made on the threads. The male adapting fitting, which was also supplied by the vendor, was a 1/4" NPT pipe thread which utilizes tapered threads where the pressure seal is made on the threads. The combination of these two fittings for the single connection may have resulted in an inadequate pressure seal. Failure of this connection to hold pressure would result in a loss of pressure in the accumulator.
If this condition occurred, the operator would receive a low pressure alarm indicating loss of nitrogen or hydraulic fluid pressure.
An inspection of the other three main steam isolation valves and the four main feedwater isolation valves revealed that the same conditions exist in these valves. All of these fittings will be replaced with proper fittings.
8312060300 831123 PDR ADOCK 05000482
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201 N. Market - Wichita. Kansas - Mail Address: PO. Box 208 I Wichita, Kansas 67201 - Telephone: Area Code (316) 261-6451
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4 Mr. J. E. Gagliardo
-D KMLNRC 83-152 November 23, 1983 The status of the investigation and resolution of this matter will be reported to you on or before February 24, 1984. In the interim, please direct any questions concerning this subject to me or Mr. Otto Maynard of my staff.
Very truly yours,
&ft GLK:cks cc: RCDeYoung WSchum/ASmith O
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