ML18054A284
| ML18054A284 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 03/16/1988 |
| From: | Kuemin J CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| TAC-M08621, TAC-M8621, NUDOCS 8803210451 | |
| Download: ML18054A284 (1) | |
Text
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POWERING NllCHlliAN'S PROGRESS General Offices: 1945 West Parnell Road, Jackson, Ml 49201 * (517) 788-0550 March 16, 1988 Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 DOCKET 50-255-LICENSE DPR PALISADES PLANT -
FINAL DISPOSITION OF ASYMMETRIC BLOWDOWN LOADS ISSUE AS IT AFFECTS FUEL ASSEMBLY GRID DESIGN (TAC No. M08621)
In our letter of May 14, 1986, Consumers Power Company indicated that the Asymmetric Blowdown Loads issue as it affects fuel assembly grid design would be resolved by demonstrating that leak-before-break assumptions are valid for the Palisades Plant.
The reference 1 submittal made by the Combustion Engineering Owners Group provides documentation of the leak-before-break evaluation.
Appendix H of that submittal verifies the applicability to the Palisades Plant.
The specific concern raised at Palisades was that the fuel assembly grid design could not withstand the asymmetric blowdown loads.
This issue is resolved by the referenced analysis and leaves. seismic loads as the only remaining -issue on grid design. The Palisades fuel vendor has developed a new grid design for inclusion in all reloads beginning with Reload M (Cycle 9)~ This new grid design will provide improved thermal performance and test results show it is a significantly stronger grid than the presently installed fuel assemblies.
Four demonstration assemblies, having this new grid design, will be loaded in the Palisades core at the next refueling outage with Reload L (Cycle 8).
Before the Reload M fuel is fabricated, the fuel vendor will have completed seismic analyses of the new grid design using the NUREG/CR-1833 methodology.
The results of the seismic analysis of the grids will be submitted as soon as they are available.
At that time the grid seismic design issue can be closed.
Reference
- 1. Letter CEOG-87-662 from J K Gasper, Chairman of the CE Owners Group to James A Norbert (NRC) submitting CEN-367 "Leak-Before-Break Evaluation of Primary Coolant Loop Piping in Combustion Engineering Designed Nuclear Steam Supply Systems", dated November 20, 1987.
L Kuemin Licensing Engineer CC Administrator, Region III, NRC NRC Resident Inspector - Palisades
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