ML18058B047
| ML18058B047 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 08/27/1992 |
| From: | Slade G CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-92-01, GL-92-1, NUDOCS 9209040081 | |
| Download: ML18058B047 (2) | |
Text
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consumers Power POW ERi Nii MICHlliAN"S PROliRESS Palisades Nuclear Plant:
27780 Blue Star Memorial Highway, Covert, Ml 49043 August 27, 1992 Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 GB Slade General Manager DOCKET 50-255 - LICENSE DPR PALISADES PLANT - REACTOR VESSEL STRUCTURAL INTEGRITY - RESPONSE TO GENERIC LETTER 92-01, REVISION 1 - ADDITIONAL INFORMATION Consumers Power Company (CPC) letter dated July 3, 1992 responded to Generic Letter 92-01, Revision 1.
Item 3.C of GL 92-01 requested that licensees report if a measured decrease in Charpy upper shelf energy exceeds the decrease predicted using guidance in paragraph C.1.2 of Regulation 1.99, Revision 2, and to describe the effect of surveillance results on adjusted reference temperature and Charpy upper shelf energy for each beltline material as predicted for December 16, 1991, and for the end of its current license.
In our response to Item 3.C, we supplied the requested information for all the Palisades reactor vessel beltline materials except weld wire heat 348009 which was used along with weld wire heat W5214 in the lower course axial welds.
The available irradiated USE data for heat 348009 shows too much variation to be considered credible to be applicable to the Palisades welds.
However, as stated in Section 2 of our May 1992 report, Projected RTp75 For the Palisades Reactor Vessel Beltline Materials, submitted June 5, 1992, "Because of the higher chemistry factor, RACO 3 W5214 + Ni200 is the limiting material for the axial beltline welds.
While the data is somewhat limited, welds fabricated with wire heat number 348009 are expected to exhibit identical or slightly better chemistry (than weld wire heat number W5214) since it succeeded weld wire heat W5214 and has the same or slightly less bare wire copper content."
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/--*-9209040081 920827 PDR ADOCK 05000255 p
PDR A CMS' ENERGY COMPANY NUCLEAR PLANT
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Using the guidance of RG 1.99, Revision 2, the predicted reduction in USE is a function of fluence and copper content; and, the adjusted reference temperature is a function of fluence and the copper and nickel content chemistry factor.
In the Palisades reactor vessel welds, heats 348009 and W5214 have been exposed to the same fluence and both heats have approximately the same copper and nickel content - the only difference being that welds made from heat 348009 are estimated to contain less copper and nickel than those made from heat W5214.
Therefore, we consider the Charpy USE and adjusted reference temperature data submitted in our July 3, 1992 response to Generic Letter 92-01, Revision 1, for welds made from weld wire heat W5214 to be conservatively applicable to welds made from weld wire heat 348009.
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Gerald 8 Slade General Manager CC Administrator, Region III, USNRC NRC Resident Inspector - Palisades