JPN-95-016, Forwards Repts Re Core Shroud Insp & Preemptive Repair Performed During 1994-95 Refueling Outage of Plant, Nonproprietary Version of XM-19 Matl Constant Extension Rate Testing Rept Requested by NRC
| ML20081K054 | |
| Person / Time | |
|---|---|
| Site: | FitzPatrick  |
| Issue date: | 03/21/1995 |
| From: | William Cahill POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20081K059 | List: |
| References | |
| JPN-95-016, JPN-95-16, NUDOCS 9503280381 | |
| Download: ML20081K054 (2) | |
Text
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March 21,1995 JPN-95-016 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station P1-137 Washington, DC 20555
Subject:
James A. FitzPatrick Nuclear Power Plant Docket No. 50-333 FitzPatdek Core Shroud Repair
References:
- 1. NYPA letter, W. J. Cahill, Jr. to NRC (JPN-95-006), "Fitzpatrick Core Shroud Repair," dated February 16,1995.
- 2. NYPA letter, W. J. Cahill, Jr. to NRC (JPN-94-053), " Request for NRC Approval of the FitzPatrick Core Shroud Repair," dated October 21,1994.
Dear Sir:
This letter transmits three reports regarding the core shroud inspection and preemptive repair performed during the 1994-95 refueling outage of the James A. FitzPatrick Nuclear Power Plant. The first two reports were recently requested by the NRC staff, and the thirri report addresses the surface condition associated with the machining of the shroud flange and gusset plates. provides a non-proprietary version of the XM-19 material Constant Extension Rate Testing (CERT) report requested by the NRC staff. A proprietary version of the report was previously submitted to the NRC with Reference 1. provides screening criteria for the evaluation of any indications identified in vertical and radial welds of the core shroud during the 1994-95 refueling outage. This evaluation was requested by the NRC staff during a February 22,1995 conference call. provides a technical evaluation of the acceptability of the electro-discharge machined (EDM) sur' aces associated with the FitzPatrick core shroud repair. The EDM process was used, as described in FitzPatrick Core Shroud Repair Summary Report (Reference 2), to machine the tie rod attachment points in the 304 SST top shroud flange and in the inconel 600 gussets at the lower shroud support plate.1 As stated on page 37 of Reference 2, the original intent was to qua!ify the EDM process to produce an EDM surface 9503280381 950321 DR ADOCK 05000333 00 PDR
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i condition that results in no micro cracking, a minimum heat effected zone, and a minimal re-cast layer depth. Reference 2 further states that the examinations associated with the qualification process wouid be performed at a 200X magnification. In spite of an extensive effort, meeting these criteria was not attainable during the qualification process. Attachment 3 describes the best surface conditions attainable with the EDM qualification process. The t'
technical evaluation concludes that the condition of the machined surfaces, associated with the EDM qualification process, does not degrade the stress corrosion cracking resistance of l
the machined surface. Accordingly, the intent of the EDM qualification criteria to produce a stress corrosion cracking resistant surface has been satisfied.
if you have any questions, please contact Ms. C. D. Falson.
1 Very truly yours, William J. Cahill, Jr.
Chief Nuclear Officer Attachments: 1. BWNT Document No. 51-1235147-00, " CERT Testing of Type XM-19 in Simulated BWR Environment," December 1994 (non-proprietary).
- 2. MPR Report 1580, " James A. FitzPatrick Nuclear Power Plant Core Shroud Vertical and Top Guide Support Ring Radial Weld Flaw Evaluation Screening Criteria," prepared by MPR Associates, dated March 1995.
3.
"J. A. FitzPatrick Plant EDM Surfaces for Shroud Repair."
i cc:
Regional Administrator U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 i
Mr. C. E. Carpenter, Prclect Ma1ager Project Directorate I-1 1
Division of Reactor Projects - 1/II U.S. Nuclear Regulatory Commission Mail Stop 14 B2 Washington, DC 20555 Office of the Resident inspector U.S. Nuclear Regulatory Commission P.O. Box 136 Lycoming, NY 13093