ML20024B108
| ML20024B108 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 06/24/1983 |
| From: | Koester G KANSAS GAS & ELECTRIC CO. |
| To: | Seidle W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| REF-PT21-83 10CFR-050.55E, 10CFR-50.55E, KMLNRC-83-078, KMLNRC-83-78, NUDOCS 8307050219 | |
| Download: ML20024B108 (4) | |
Text
KANSAS GAS AND ELECTRIC COMPANY T *45 E LE CTF*C COMPAN v OLENN L AOESTEN v<sposset=, =vctama June 24, 1983 Mr. W.C. Seidle, Chief Reactor Projects Branch 2 U.S. Nuclear Regulatory Commission pg pl Region IV
~+j 611 Ryan Plaza Drive, Suite 1000 I '
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i Arlington, Texas 76011 W/f.)
KMLNRC 83-078 Re:
Docket No. STN 50-482 Ref: KMLNRC 83-031 dated 3/21/83 from GLKoester, KG&E, to WCScidle, NRC Subj: Final 10CFR50.55(e) Report - Bolt Torque on Instrument Mounts
Dear Mr. Seidle:
The Referenced letter provided an interim report on a 10CFR50.55(e) item concerning the bolt torque on instrument mounts. This letter provides the final report concerning bolt torque on instrument mounts.
The attached final report is submitted pursuant to 10CFR50.55(e).
If you have any questions concerning this subject, please contact me or Mr. Otto Maynard of my staff.
Yours very truly, g
Y$
GLK:bb Attach cc: RCDeYoung, w/a l
HRoberds/WSchum, w/a 8307050219 2
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201 N. Market ~ Wrchtta. Kansas - Mad Address: PO. Box 208 } bYchita, Kansas 67201 - Telephone: Area Code (316) 261-6451
ATTACHMENT TO KMLNRC 83-078 Page 1 of 3 10CFR50.55(e) Final Report On Bolt Torque on Instrument Mounts For Wolf Creek Generating Station, Unit 1b. 1 Kansas Gas and Electric Company June 24, 1983 l
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,0 KMLWRC 83-078' Page 2 of,3' I.
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i During a surveillance of instrument installations, a potentially i
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reportable item.was revealed concerning torque values for instrument,
mounting bolts. On February 22, 1983, Kansas Gas and Electric Compady 3
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notified NRC' Region'; IV of this matter. An interim report was then 4
submitted to the NRC on March 21, 1983.
Y II.
DESCRIPTION OF DEFICIENCY j
The designer's specifications state that instruments should be I
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installed in accordance with the manufacturer's specifications when i
they provide torque requirements for mounting bolts.
.If a specific torque value is not provided, the designer then reconnends that the bolts be torqued snug using an eight to twelve-inch wrench. For i
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three types of instruments supplied by ITT Barton, the bolts were i
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potentially improperly torqued. The vendor's bolt torque specifi-
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cations were not being picked up on the traveler. This resulted in bolts being torqued snug rather than to the vendor's specified torque value.
In the interim the traveler was revised to include the specified bolt torque value.
However, when attempting to go back and correctly torque
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these bolts, it was found that the vendor specified torque value was 6
too high and mounting bolts for the vendor's instruments broke. There-fore, the designer was requested to evaluate this item and to provide revised torque specifications for these instrument mounting bolts.
These instruments supplied by ITT Barton are used by other utilities.
However,IKG&E does not have a listing of users.
I.
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KMLNRC 83-078 III.
ANALYSIS OF SAFETY IMPLICATIONS Page 3 of 3 The designer's evaluations indicate that torquing these bolts snug l
rather.than to the vendor's specifications, would not have adversely 1
affected the safety of operations of the plant. However, if the
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bolts had been installed according to the manufacturer's specifica-I tions, they would have been overtorqued. Therefore, rather than l
performing a safety analysis, the conservative assumption was made l
that this deficiency could have adversely affected the safety of i
operations of the plant. This matter is therefore reportable under 10CFR21/50.55(e).
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IV.
CORRECTIVE ACTION 3
The bolts of these instruments that were torqued using the. manufacturer's i
i specifications are now considered to be overtorqued. These bolts will be replaced and torqued using the revised requirements specified by the designer.
It is anticipated th'at approximately two months will.be required to complete the corrective action. In any event, the corrective action will be completed prior to fuel load.
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