ML18059A640
| ML18059A640 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 01/18/1994 |
| From: | Hsia A Office of Nuclear Reactor Regulation |
| To: | Slade G CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| Shared Package | |
| ML18059A641 | List: |
| References | |
| TAC-M87760, NUDOCS 9401280142 | |
| Download: ML18059A640 (3) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION Docket No. 50-255 Mr. Gerald 8. Slade Plant General Manager Palisades Plant Consumers Power Company WASHINGTON, D.C. 20666-0001 January 18, 1994 27780 Blue Star Memorial Highway Covert, Michigan 49043
Dear Mr. Slade:
SUBJECT:
SAFETY EVALUATION OF THE CRACKING OF INCONEL 600 COMPONENTS IN THE PALISADES PRESSURIZER (TAC NO. M87760)
As a result of the NRC staff review of your engineering analysis and root cause evaluation dated October 7, 1993, for the through-wall crack discovered in the Palisades pressurizer power-operated relief valve (PORV) safe-end, the staff forwarded two requests for additional information to you, both dated October 8, 1993.
Subsequently, the staff received your responses dated October 15, 20, 27, 29, November l, and 30, 1993.
On October 9 and 12, 1993, Palisades plant personnel identified cracks at the pressurizer steam phase and liquid phase temperature element nozzles, respectively. These failures were attributed to primary water stress corrosion cracking (PWSCC).
The staff has reviewed your submittals dated October 7, 15, and 20, 1993.
In these, Palisades described the analyses and repairs of cracks in the PORV line and in the two instrumentation nozzles.
The staff finds the repair welds acceptable for the operation of one fuel cycle.
This finding is based on your evaluations, repairs and inspections, existing leak rate monitoring requirements and capabilities, and the fact that a failure of one of the subject lines is bounded by the small break loss of coolant accident (LOCA) described in the Final Safety Analysis Report.
The staff's safety evaluation is enclosed.
Palisades has also committed to developing a plan to address the PWSCC of Inconel 600 components in the Palisades primary coolant system.
This plan should include the technical bases for planned inspection, modifications,
/-- --- 9401200142~940110- -- -- -- --,
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Mr. Gerald January 18, 1994 repairs, and replacement, particularly for the PORV, surge line and spray line nozzles. This plan should be submitted 3 months prior to start of the next refueling outage.
Enclosure:
Safety Evaluation cc w/enclosure:
See next page DISTRIBUTION Docket File NRC & Local *PDRs PD3-1 Rdg File J. Roe J. Zwolinski A. R; Blough A. Hsia C. Jamerson J. Strosnider (EMCB) 7/D/4 R. Hermann (EMCB) 7/D/4 M. Banic (EMCB) 7/D/4 M. Hum (EMCB) 7/D/4 OGC ACRS (10)
L. Miller, RIII B. Jorgensen, RIII SEDB OFFICE LA:PD31 NAME DATE COPY Sincerely, Original signed by Anthony H. Hsia, Project Manager Project Directorate III-1 Division of Reactor Projects - III/IV/V Office of Nuclear Reactor Regulation (A)PD:PD3 ABlough 01/ '//94
Mr. Gerald B. Slade Consumers Power Company cc:
M. I. Miller, Esquire Sidley & Austin 54th Floor One First National Plaza Chicago, Illinois 60603 Mr. Thomas A. McNish, Secretary Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Judd L. Bacon, Esquire Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Regional Administrator, Region III U.S. Nuclear Regulatory Commission 801 Warrenville Road Lisle, Illinois 60532-4351 Jerry Sarno Township Supervisor Covert Township 36197 M-140 Highway Covert, Michigan 49043 Office of the Governor Room 1 - Capitol Building Lansing, Michigan 48913 Mr. David W. Rogers Safety and Licensing Director Palisades Plant 27780 Blue Star Memorial Highway Covert, Michigan 49043 U.S. Nuclear Regulatory Commission Resident Inspector Office Palisades Plant 27782 Blue Star Memorial Highway Covert, Michigan 49043 Palisades Plant Nuclear Facilities and Environmental Monitoring Section Office Division of Radiological Health Department of Public Health 3423 N. Logan Street P. O. Box 30195 Lansing, Michigan 48909 Gerald Charnoff, Esquire Shaw, Pittman, Potts and Trowbridge 2300 N Street, N. W.
Washington DC. 20037 Alora Davis Commitment Tracking System Coordinator Palisades Plant Consumers Power Company 27780 Blue Star Memorial Hwy.
Covert, Michigan 49043-9530 December 1993