ML19257A520

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Advises of Inservice Insp of Vessel Nozzles Using Underclad Ultrasonic Examination Technique in Summer 1980 for Unit 1 & Early 1981 for Unit 2.Westinghouse Authorized to Proceed W/Reactor Vessel Safety Analysis for Nozzles
ML19257A520
Person / Time
Site: Prairie Island  Xcel Energy icon.png
Issue date: 12/28/1979
From: Mayer L
NORTHERN STATES POWER CO.
To:
Office of Nuclear Reactor Regulation
References
NUDOCS 8001040548
Download: ML19257A520 (1)


Text

NSIB NORTHERN STATES P O W E It COMPANY M IN N E A PO LI S. M IN N E S OTA 55401 December 28, 1979 Director of Nuclear Reactor Regulation U S Nuclear Regulatory Commission Washington, DC 20555 PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket Nos. 50-282 License Nos. DPR-42 50-306 DPR-60 Reactor Vessel Nozzle Underciad Inspection In a meeting with representatives of the Westinghouse Electric Corporation and the NRC Staff on November 26, 1979 we outlined our plans for perfcrming inservice inspection of the Prairie Island vessel nozzles. This inspection will be done to coufirm our belief that the nozzle cladding process used in the fabrication of the Prairie Island vessels did at giva rise to flaws which could impair integrity.

Both outlet nozzles in each unit will be inspected using the underclad ultrasonic examination technique now being developed by Westinghouse.

Procedures and equipment for this inspection will be available by the middle of next year. Unit No. I will be inspected during the summer 1980 refueling outage and Unit 2 will be inspe-ted dining the early 1981 refueling outage. Additional nozzles will be inspected if evidence of significant underclad cracking is found.

In addition co scheduling these inspections, we have authorized Westinghouse to proceed with a reactor vessel safety analysis program for the Prairie Island vessel nozzles. This analysis includes an ASME Code Section III Appendix G analysis per 10 CFR Part 50, Appendix G, accident analyses, and fatigue analyses. These analyses will be available to evaluate the results of the nozzle inservice inspections.

A summary report of the nozzle inservice inspections will be provided to the Commission within 90 days of the completion of each inspection.

Please' contact us if you require additional information concerning our plan and schedule for resolving this issue.

L 0 Mayer, PE Manager of Nuclear Support Services LOM/DMM/ak cc: J G Keppler G Charnoff 8001040