ML20076D593
| ML20076D593 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 07/24/1991 |
| From: | Schnell D UNION ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-89-001, IEB-89-1, ULNRC-2447, NUDOCS 9107300032 | |
| Download: ML20076D593 (4) | |
Text
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Ibl' ECTR,IC' July 24, 1991 U.S. Nuclear Regulatory Commission ATTN Document Control Desk Mail Station Pl-137 Washington, D.C.
20555 ULNRC-24 4 7 Gentlement DOCKET NUMBER 50-403 CALLAWAY PLANT FAILURE OF WESTINGilOUSE STEAM GENERATOR TUBE MECHANICAL PLUGS Referenco: HRC Bulletin No. 89-01, Supplomont 2, dated June 28, 1991 HRC Bulletin No. 89-01, Supplomont 2, Action Item 1 requested Licensons to verify that information contained in Tablo 2 of Reference 4 for plugs fabricated from group 2 heats is correct.
The information contained in Tablo 2 of Referenco 4 is correct for Callaway Plant regarding the number of plugs installed in the hot-log and cold-leg side of each steam generator, their heat numbers, and datos of installation.
The plug operating temperaturo, however, should be revis9d to 618.4 degrees F for the HL and 588.4 degroos F for the CL plugs.
Action item 2a through 2f will be addressed as follows:
Union Electric will remove all of the subject hot-leg plugs at the next refueling outage in the Spring, 1992.
The cold-log plugs will not be removed, as their romaining predicted lifetimes are sufficient for them to remain installed for the life of the plant.
Plugs fabri-cated from Inconel 600 will not be installed in the future.
Maintaining personnel exposure ALARA will be a high priority for the tubo plug removal work to be performed.
If there are any questions concerning this matter, pleano contact me.
Very truly yours,
/a
-(A Donald F. Schnell JMC/ dis 7
9107300032 910724
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Donald F.
Schnell, of lawful ago, being firnt duly sworn upon oath says that he in Senior Vice President-tuclear and an officer of Union Electric Company; that he has road the forogoing document and Itnown the content thoroof; that he has executed the same for and on oehalf of said company with full power and authority to do no; and that the facto theroin ntated aro true and correct to tho bent of his Itnowledge, information and belief.
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Schnell Senior Vice President 14ucionr c/ M SUBSCRI ED and sworn to before me this day i
l of Jm 1991.
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