ML20125C801
| ML20125C801 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 12/08/1992 |
| From: | Colburn T Office of Nuclear Reactor Regulation |
| To: | Orser W DETROIT EDISON CO. |
| Shared Package | |
| ML20125C803 | List: |
| References | |
| GL-81-11, TAC-M84140, NUDOCS 9212140082 | |
| Download: ML20125C801 (4) | |
Text
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December 8, 1992 Docket No. 50-341 Mr. William S. Orser Senior Vice President - Nuclear Operations Detroit Edison Company 6400 North Dixie Highway Newport, Michigan 48166
Dear Mr. Orser:
SUBJECT:
FERMI-2 REVISED FEEDWATER N0ZZLE CRACK GROWTH ANALYSi$ PER GENERIC LETTER 81-11 (TAC N0. M84140)
By "NRC-92-0090, Responds to Three Outstanding Issues Associated W/Generic Ltr 88-01, NRC Position on IGSCC in BWR Austenitic Stainless Steel Piping. Issues Include Resolution of TS 3/4.4.3.2 Re RCS [[Topic" contains a listed "[" character as part of the property label and has therefore been classified as invalid. Vs Generic Ltr|letter dated July 29, 1992]], you provided for NRC review a revised feedwater nozzle crack growth analysis fcr Fermi-2. The revised analysis was a response to the NRC request that required Detroit Edison Company (Deco) to re-evaluate your original feedwater nozzle analysis.
Your original growth analysis did not meet Generic Letter 81-11 criterion of limiting growth of a postulated 0.25 inch deep crack to a depth no greater than 1.0 inch in 40 years.
Dur original analysis demonstrated that the postulated crack would grow to 1.0 inch in 8.9 operating years.
Your revised analysis demonstrates that the postulated crack would grow to a 1.0 inch depth in 38.3 years.
This does not satisfy the crack growth criterion in Generic Letter 81-11. Nevertheless, we have determined that the methodology in the-analysis is acceptable because it is consistent with feedwater nozzle analyses that we have approved previously.
You stated that the thermal cycle projections used in the revised analysis are still conservative.
Further, you believe that the actual number of thermal cycles will be less than projected and that this will result in a calculated crack growth to no greater than one inch in 40 years.
However, the staff requires confirmation of this growth analysis when more operating data on thermal cycles are available and -submit the analysis for NRC review six months prior to the end of 12 operating years.
The details of our review are contained in the enclosed Safety Evaluation.
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The reporting and/or recordkeeping requirements contained in this letter affect fewer than ten respondents, therefore, OMB clearance is not required under P.L.96-511.
If you have any questions, please call me at (301) 504-1341.
Sincerely, Original signed by:
Timothy G. Colburn, Sr. Project Manager Project Directorate 111-1 Division of Reactor Projects - lil/lV/V Office of Nuclear Reactor Regulation
Enclosure:
Safety Evaluation cc w/ enclosure:
See next page DISTRIBUTION:
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2 The reporting and/or recordkeeping requirements contained in this letter affect fewer than ten respondents, therefore, OMB clearance is not required under P.L.96-511.
If you have any questions, please call me at (301) 504-1341.
Sincerely, bW Timothy G. Colburn, Sr. Project Manager Project Directorate 111-1 Division of Reactor Projects - III/IV/V Office of Nuclear Reactor Regulation
Enclosure:
Safety Evaluation cc w/ enclosure:
See next page
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-1 Mr. William Orser Fermi-2 I
Detroit Edison Company l
cC; John Flynn, Esquire Senior Attorney Detroit Edison Company 2000 Second Avenue Detroit, Michigan 48226 Nuclear Facilities and Environmental Monitoring Section Office Division of Radiological Health Department of Public Health 3423 N. Logan Street P. 0. Box 30195 Lansing, Michigan 48909 Mr. Stan Stasek U.S. Nuclear Regulatory Commission Resident inspector Office 6450 W. Dixie Highway Newport, Michigan 48166 Monroe County Office of Civil Preparedness 963 South Raisinvile Monroe, Michigan 48161 Regional Administrator, Region til U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137
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Mr. A. Cacil Settles Director - Nuclear Licensing Detroit Edison Company Fermi 2 6400 North Dixie Highway Newport, Michigan 48166