ML20245B361
| ML20245B361 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 06/15/1989 |
| From: | George Thomas PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-89-001, IEB-89-1, NYN-89073, NUDOCS 8906230144 | |
| Download: ML20245B361 (2) | |
Text
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George S. Thomas New Hampsh.
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vic.ne moni.wei.orn wuo, ion Yankee NYN-89073 June 15, 1989 United States Nuclear Regulatory Commission
. Washington, DC 20555 Attentions-Document Control Desk-References (a). Facility Operating License NPF-67, Docket No. 50-443 (b) NRC Bulletin No. 89-01: Failure of Westinghouse Steam Generator Tube Mechanical Plugs (c) Westinghouse reports WCAP-12244 (proprietary version) and WCAP-12245 (non-proprietary version), " Steam Generator Tube Flug Integrity Summary Report." Revision 1, April,.1989
Subject:
Response to NRC Bulletin 89-01: Failure of Westinghouse Steam Generator' Tube Mechanical Plugs Gentlemen:
This letter provides information required by NRC Bulletin 89-01 regarding steam generator tube mechanical plugs supplied to Seabrook Station by Westinghouse Electric Corporation.
There are currently a total of twelve mechanical plugs installed in the tubes.of the four steam generators at Seabrook Station Unit 1.
These twelve plugs were supplied by Westinghouse from heat number 2387 which is not one of the heat numbers of concern identified by the Bulletin.
The material from heat number 2387 is reported by Reference (c) to exhibit continuous grain boundary carbide distribution. Consequently, the corrective actions requested by the Bulletin for installed steam generator tube mechanical plugs from heat numbers 3279, 3513, 3962 and 4523 are not j
applicable to Seabrc,vk.
It has been determined that no steam generator tube mechanical plugs are in Seabrook Station inventory. Reference (c) indicates that mechanical
. plugs supplied by Westinghouse for future installation in steam generators will consist of material having a preferred microstructure.
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ADDCK 05000443 N PNU jl New Hampshire Yankee Division of Public Service Company of New Hampshire P.O. Box 300
- Seabrook, NH 03874
- Telephone (603) 474-9521 g
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J' United States Nuclear Regulatory Commission June 15, 1989 Attentions. Document Control Desk Page 2 There are no current plans to remove any of the twelve steam generator tube mechanical plugs installed in Seabrook Station Unit 1.
However, in the event of future removal Westinghouse mechanical plugs will be examined for indications of primary water stress corrosion cracking (PWSCC) on a j
sample basis. The results of these examinations will be retained as part of l
1 the steam generator records and applicable information will 'oe provided to Westinghouse.
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If you have any questions regarding this matter, please contact i
Mr. Geoffrey Kingston at (603) 474-9521, extension 3371.
Very truly yours, h yl PLW
, y George S. Thomas cc:
Mr. William T. Russell Regional Administrator United States Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia, PA 19406 i
Mr. Victor Nerses, Project Manager j
Project Directorate I-5 1
United States Nuclear Regulatory Commission
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Division of Reactor Projects Washington, DC 10555 I
NRC Senior Resident Inspector
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P.O. Box 1149 j
Seabrook Station, NH 03874 STATE OF NEW HAMPSHIRE L
Rockingham, ss.
June 15, 1989 s
Then personally appeared before me, the above-named George S. Thomas who, being duly sworn, did state that he is Vice President - Nuclear Production of Public Service Company of New Hampshire, that he is duly authorized to execute and file the foregoing information in the name and on the behalf of Public Service Company of New Hampshire, and that the statements therein are true to the best of his knowledge and belief.
Ouw1 b h uA Beverly E.Q illoway, Notary jublic My Commission Expires: March 6, 1990
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