ML20090J615
| ML20090J615 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 03/11/1992 |
| From: | Schnell D UNION ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-89-001, IEB-89-1, ULNRC-258, NUDOCS 9203170366 | |
| Download: ML20090J615 (4) | |
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[1NION Donald F. Scnney 2, w m nblECTRIC wa
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U.S.
Nuclear Regulatory Commission ATTN:
Document Control Desk Mail Station Pl-137 Washington, D.C.
20555 Gentlemen:
ULNRC-2566 DOCKET NUMBER 50-483 CALLAWAY PIANT FAILURE OF WESTINGilOUSE STFAM GENERNPOR TUBE MECHANICAL PLUGS
References:
- 1) NRC Bulletin No. 89-01, dated May 15, 1989
- 2) NRC Bulletin No. 89-01, Supplement 2,. dated June 28, 1991
- 3) ULNRC-2019, dated June 15, 1989
- 4) ULNRC-2447, dated July 24, 1991 Reference 3 transmitted Union Electric's response to requested actions-identified in Bulletin 89-01.
We had ccumitted to performing an examination for PWSCC, on a sample of Westinghouse mechanical-plugs fabricated from 6
thermally treated Inconel 600.
The results of these examinations were to be provided to Westinghouse to improve the database concerning the susceptibility of plugs to PWSCC.
From the ongoing examinations of data collected, the NRC-issued Supplement 2 to Bulletin 89-01 informing licensees that all Westinghouse mechanical plugs q
fabricated from thermally treated Inconel 600 were subject to PWnCC and installation of these plugo should-be discontinued._ Union Electric's response to Supplement 2 provided in Reference 4 stated that we would remove all the subject hot-leg plugs at the upcoming refueling outage.
The cold-leg plugs would nut be
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liuclear Regulatory Commission Page 2 removed since their remaining predicted lifetimes are suf'icient for the life of the plant and conservatively exceed any predicted plant life extensions.
L Regarding the removed plugs, it is to longer necessary to perform any examinations for PWSCC for the purpose of providing data to Westinghouse.
The Inconel 600 plugs are all considered to be susceptible to PWSCC and are being removed from applications where tnoir use adversely affects the reactor coolant pressure boundary.
If there are any questions concerning this matter, p3 ease contact me.
Very trily yours,
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'M Y6 Donald F.
Schnell JMC/plh
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O 18225-A Flower Hill Way Vj Gaithersburg, MD 20879-5334
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Office of Nuclear Reactor Regulation
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Unlear Regulatory Commission
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Manager,; Electric Department Missouri'Public Service Commission Sit P.O. Box'360 Jefferson City,-MO 65102 r;
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