ML20094J403
| ML20094J403 | |
| 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-84-132, NUDOCS 8408140308 | |
| Download: ML20094J403 (7) | |
Text
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s KANSAS GAS AND ELECTRIC COMPANY THE ELECTAC CCPAPANY GLENN L MOESTER vce persiotNr. NucLEne 32@M OWS %
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9g August 6, 1984 h
Mr. D.R. Hunter, Chief Reactor Project Branch 2 U.S. Nuclear Ragulatory Commission Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 VMLNRC 84-132 Re:
Docket No. STN 50-482 Ref:
Interim Report KMLNRC 84-014 dated 2/9/84 from GLKocster, KG&E, to JEGagliardo, NRC Subj: Final 10CFR50.55(e) Report - Butterfly Valves
Dear Mr. Hunter:
This letter provides the final report submi.tted pursuant to 10CFR50.55(e) concerning Butterfly Valves. This matter was reported by Mr. Otto Maynard of Kansas Gas and Electric Company (KG&E) to Mr. William Johnson of the Nuclear Regulatory Commission, Region IV, on January 10, 1984.
Please direct any questions concerning this subject to me or to Mr. Otto Maynard of my staff.
Yours very truly, VN s
GLK:bb Attach xc RCDeYoung, w/a s
PO'Connor, w/a HBundy, w/a
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8408140308 840806 h
PDR ADOCK 05000482
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201 N. Market - WicMs. Kansas - Mail Address: 00. Box 208 i W1chita, Kansas 67201 - Telephone: Area Code (316) 261-6451
< ATTACHMENT to KMLNRC 84-132 August 6,:1984 1 of 6 FINAL REPORT On BUTTERFLY VALVES at WOLF CREEK GENERATING STATION KANSAS GAS & ELECTRIC COMPANY July 11, 1984
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Attachment.to KMLNRC 84-132 2 of 6 INDEX I.
Introduction II.
Description of Problem III.-
Analysis of Safety Implications IV.
Corrective Actions i
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Attachment to KMLNRC 84-132 3 of 6 I.
INTRODUCTION During flushing operations K&GE Startup personnel experienced difficulty in operating a. twenty-inch butterfly valve located in the component cooling water- (EG). system.
The valve (heat exchanger outlet valve EG-VO44) was subsequently disassembled and the internals were.examin~ed to determine the cause of the
. operating difficulties.
The examination revealed that the two taper pins which^ secure the butterfly valve' disc to the shaft were missing.
At that time KG&E reported the deficiency pursuant to 10CFR50.55(e) and initiated corrective actions.
6
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Attachment to KMLNRC 84-132 4 of 6 II. DESCRIPTION OF PROBLEM The valve in question.was a twenty-inch butterfly valve, Type 9270, supplied by Fischer Control.
The disc in this type of valve is secured to the shaft by two taper pins.
Two pin holes through_the valve disc match two pin holes along the major axis of.the valve shaft.
The pins are inserted and then seated by tapping to a snug fit.
The four inch long pins, Fischer Part
- H1374535362, have an outside diameter of.591 inches at the large end and tapers at a rate of.25 inches per foot.
As.a result of finding the missing pins in the' heat exchanger outlet valve, all other valves of the same type were disassembled and. examined.
The inspections identified five additional valves
- with missing or improperly seated pins.
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L
Ef Attachment to KMLNRC 132 5 of 6 III.,
ANALYSIS OF SAFETY IMPLICATIONS The valves found with missing or improperly seated pins were all
- safety-related:and the inoperability of any of these valves could degrade the operability of the safety-related system in1which-they are installed.
Although the failure of a single valve or certain combinations of valves will not preclude the safe operation / shutdown of the plant, valve failure could render their respective systems inoperable.
In lieu of performing an evaluation of.the safety implications for each. valve found with missing or improperly seated pins, KG&E reparied the valves as describe" in Section IV of this report, h
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Attachment to WW23RC 84-132 6 of 6 IV.
CORRECTIVE ACTIONS Upon identification of the missing pins, KG&E initiated a Startup Field Report to document the deficiency and provide appropriate controls to assure resolution of the concern.
As described in Section II of this report, all valves of the same type were disassembled and examined for missing or improperly seated pins in order to determine the extent of the problem.
All six Fischer Control, Type 9270, valves found with loose or
-missing pins were repaired per the manufacturers instructions.
These repairs wore witnessed and inspected by the manufacturers representative.
(The repair process included a thorough cleaning of the tapered holes and new pins.)
The pins were then coated with " loc-tite" and seated in the tapered holes with sharp hammer
. strikes on the large end of_the pin.
These repairs have all been completed and no additional problems have been encountered.
_.