ML20101N117
| ML20101N117 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 07/02/1992 |
| From: | Schnell D UNION ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-89-001, IEB-89-1, ULNRC-2658, NUDOCS 9207090165 | |
| Download: ML20101N117 (5) | |
Text
.
mi cmame Pest O&e Bm 149 St lou 1 Mssour:C316E 31tS5t?650 Union July 2, 1992
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53 U.S. Nuclear Regulatory Commission ATTN: Document Canerol Desk Mail Station F1-137 Washington, D.C.
20555 ULNRC-2658 Gentlemen:
DOCKET NUMBER 50-483 CALLAWAY PIANT FAILURE OF WESTINGHOUSE STEAM GENERATOR TUBE MECHANICAL PLUGS
References:
- 1) - NRC Bulletin No. 89- 01, Supplement 2, dated June 28, 1991
- 2) ULNRC-2447, dated July 24, 1991 NRC Bulletin No. 89-01, Supplement 2 required licensees to repair or remove generator mechanical tube plugs fabricated from various heats of Inconel 600 material.
Our response to the bulletin indicated we would remove 37 of the subject plugs in the just completed Refuel 5.
Several attempts were made during the outage to remove the plugs, unfortunately none were successful.
As a result another remedial measure had to be used.
This process involved
" spot-facing" the tube /tubesheet and installing a welded plug made of Inconel 69C material below the mechanical plug.
The spot-facing was performed ur.ng a cutter which bore out the tube / plug for approximately 3/8" and simultaneously removed.010.020" of cladding from the tubesheet to prepare it for welding.
The welded plug was then installed (See Attachinent).
B&W Nuclear Services had previously qualified the process and the work was performed to their approved procedures.
We believe this is an appropriate remedial action as required by NRC Bulletin 89-01, Supplement 2, in lieu of replacement of the plugs.
If there are any questions concerning this matter, please contact me.
Very truly yours, Q
,s a,
)J g(U; 00 Donald F. Schnell JMC/dls Attachment 9207090165 920702
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gDR-ADOCK 05000403 110 PDR
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cc:
T. A. Baxter, Esq.
j Shaw, Pittman, Potts & Trowbridge 2300 N. Street, N.W.
Washington, D.C. 20037 Dr. J. O. Cermak CFA, Inc.
18225-A Flower Hill Way Gaithersburg, MD 20879-5334 R.
C. Knop Chief, Reactor Project Branch 1 U.S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 Bruce Bartlett Callaway Resident-0"fice U.S. Nuclear Regula.ory Commission RR#1 Steedman, Missouri 65077 L. R. Wharton-(2)
Office of-Nuclear Reactor Regulation U.S. Nuclear Regulatory-Commission 1 White Flint, North, Mail Stop 13E21 11555 Rockville' Pike Rockville, MD 20852 Manager, Electric Department Missouri Public Service Commission P.O. Box 360 Jefferson City, M0'65102
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bec: D. Shafer/A160.761
/QA Record (CA-758)
Nuclear Date E210.01 DFS/ Chrono D.
F. Schnell J.
E.
Birk J. V.
Laux M. A.
Stiller G.
L. Randolph R. J.
Irwin P. Barrett C. D. Naslund A. C.
Passwater D.
E. Shafer W.
E. Kahl S. Wideman (WCNOC)
R. C. Slovic (Bechtel)
T.
P. Sharkey NSRB (Sandra Dale)
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T WELD PREP COMPLETE
Attachnont PO93 2 of 2 4
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WELDED PLUG INSTALLED
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