ML20094P028
| ML20094P028 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 08/06/1984 |
| From: | Koester G KANSAS GAS & ELECTRIC CO. |
| To: | Johnson E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| KMLNRC-84-128, NUDOCS 8408160505 | |
| Download: ML20094P028 (5) | |
Text
KANSAS GAS AND ELECTRIC COMPANY TFE ELECTAC COMPANY OLENN L MOESTER wett 79tsuDENT = NWCLEAR August 6, 1984 Mr. E.H. Johnson, Acting Chief l
Reactor Project Branch 2 DhhhO U.S. Nuclear Regulatory Commission Region IV
,g 611 Ryan Plaza Drive, Suite 1000 h
Arlington, Texas 76011 w -
KMLNRC 84-12fl Re:
Docket No. STN 50-482 Subj: Final 10CFR50.55(e) Report -
Insufficient Torque on Structural Steel Bolted Connections
Dear Mr. Johnson:
Attached is the final report submitted pursuant to 10CFR50.55(e) concerning structural steel bolted connections.
Please contact me or Mr. Otto Maynard of my staff if you have any questions concerning this report.
Yours very truly, IflV GLK:bb Attach xc: RCDeYoung, w/a PO'Connor, w/a HBundy, w/a 8408160505 840806 b
PDR ADOCK 05000482 S
PDR l4 al 201 N. Market - WicNte. Karnas - mar Address: PG. Box 208 I Wchita. Kansas 67201 -Telephone: Area Code (316) 261-6451
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-g *e; ATTACHMENT TO KMLNRC 84-128
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August 6,"1984 1 of 4 FINAL'10CFR50.55(e). REPORT'
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- STRUCTURAL-STEEL' BOLTED CONNECTIONS-for WOLF CREEK' ENERATING STATION-5 l
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. INDEX L
I.
- Introduction-
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- References A
III.--Description of Problem e
IV.
- Analysis of Safety Implications-V.-
Corrective Actions h,
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INTRODUCTION Through routine information exchange with other utilities, Kansas Gas and Electric Company (KG&E) became aware of a potential problem with structural steel bolted connections. As a result of that information, KG8E's Wolf Creek Constructor initiated a re-inspection program for bolted connections on structural steel to determine the condition of completed connections in the plant.
This reinspection program identified some connections that appeared to be torqued less than specified. At that time KG&E reported this concern as a potential 10CFR50.55(e) and.the Constructor initiated a Corrective Action Report (CAR 1-C-0026) to control and document the resolution of this matter.
References 1,2, and 3 provided interim reports on this subject to the Nuclear Regulatory Commission.
A subsequent NRC inspection of related areas raised additional concerns with procedural controls for making connections and the scope of this issue was expanded to include some of these additional concerns. Reference 4 documented these additional items and provided an update on the original Corrective Action Report Status.
The additional concerns on bolted connections have been evaluated and determined not to be reportable pursuant to 10CFR50.55(e).
Reference 5 provided a detailed response to all of the questions raised during the NRC inspection audit.
II.
REFERENCES 1.
Interim Report KMLNRC 83-021 dated 3/3/83 from GLKoester, KG8E, to WCSeidle, NRC 2.
Interim Report KMLNRC 83-076 dated 6/20/83 from GLK6 ester, KG&E, to WCSeidle, NRC 3.
Interim Report KMLNRC 83-116 dated 9/9/83 from GLKoester, KG&E, to WCSeidle, NRC 4.
Interim Report KMLNRC 83-169 dated 12/30/83 form GLKoester, KG&E, to JEGagliardo, NRC 5.
Letter KMLNRC 84-051, dated 3/30/84, from GLKoester, KG&E, to JEGagliardo, NRC.
III.
Description of Problem l
j Prior to the issuance of Corrective Action Report 1-C-0026 there were no procedural
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l requirements for the crafts to notify Quality Control prior to the removal of any structural steel items which had previously been Quality accepted.
Therefore I
the potential existed for a bolted cornection to be reworked without being Quality l
accepted upon completion of the rework. A reinspection of bolted connections l
revealed that connections had been reworked and some of the Load Indicating l
Washers had not been compressed to the specified gap. Therefore the bolt torque l
was less than specified for the connection, u
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IV. Analysis of Safety Implications Bolted connections consist of several bolts and although some connections were identified in which one or more of the bolts had not been torqued sufficiently to compress the Load Indicating Washer to its specified gap, none of the connections wore " loose". However, rather than evaluate the adequacy of each bolted connection.
-KG8E elected to reinspect and, if necessary, rework the bolted connections in question.
V.. Corrective Action Corrective Action Report (CAR) 1-C-0026 was initiated to track the evaluation and resolution of this matter. The CAR defined a two phase plan of action to determine the condition of the bolted connections, correct those found to be insufficiently torqued, and prevent similar concerns for any future work.
Phase I of the action plan determined which connections had been altered subsequent to being Quality accepted and had those connections reworked. Phase II provided for a reverification of a sampling of connections to assure that Phase I was effective in identifying and correcting nonconforming connections.
In addition-procedures were revised to provide for the notification of Quality Control whenever connections need to be reworked. All corrective actions have now been completed.
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