ML20196E861
| ML20196E861 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 12/05/1988 |
| From: | Musolf D NORTHERN STATES POWER CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| IEB-80-08, IEB-80-8, NUDOCS 8812120110 | |
| Download: ML20196E861 (7) | |
Text
_.
Northem States Power Company 414 Nicollet Mall Minneapohs. Mmnesot. 55401 1927 Telephone (612) 330-5500 N C Bulletin 80 08 December 5, 1988 i
Director of Nuclear Reactor Regulation l
U S Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 l
PRAIRIE ISLAND NUCLEAR CENERATING PLANT Docket Nos. 50 232 License Nos. DPR 42 50 306 DPR-60 l
Additional Response to NRC IE Bulletin 80 08 Examination of Containment Liner Penetration Welds
References:
(a)
Letter dated October 31, 1980, from D E Gilberts, NSP, to J G Meppler, NRC Region III, Additional Information Related to IE Bulletin 80 08 (b)
NUREC/CR 3053, "Close,ut of IE Eulletin 80 08:
Examination of Contain=ent Liner Penetration Welde," July, 1984 The purpose of this letter is to provide additional information for NRC Staff review to permit closing out I2 Bulletin J0 08 for Unit 1 of the Prairie Island Nuclear Generating Plant.
In our initial responses to IE Bulletin 80 08, we identified two pene-tration butt velds with backing rings in Unit i, penetration 7A (field welds =8 and =14) which were ultrasonically tested, but no; radio-graphed.
As noted in Reference (4), subsequent attempts to radiograph these velds were not successful.
Reference (b) recomnended a possible resolution of this issue.
For those welds where a meaningful radiographic examination cannot be made, justification should be developed and submitted to the NRC for review. This justification could stem from a review of weld design if wall thicknesses were chosen assuming low weld efficiency factors.
An engineering justification suggested in Reference (b) has been completed.
The approach taken was to demonstrate that all operating and upset stresses are low enough as to be insignificant in relation to the strength of the joints, even assuming low weld efficiencies.
5312120110 801205 FDR ADOCK 05000232 1
0 ppe
\\ \\
Director of NRR Nodhom States Power Company December 5. 1988 Page 2 A copy of this analysis, completed by the NSP Materials and Special Processes Group, is attached. This is applica'le to both of the velds in question. The conclusion of the analysis is, that even if the velds in question were only 10% effective, the worst case combination of stresses vould still amount to only a small fraction of the yield strength of the material.
Therefore, we believe that the inability to radiograph the two velds in question is not a concern.
D d b w.
David Musolf Manager Nuclear Support Services c: Regionai Administrator, Region III, NRC St Resident Inspector, NRC NRR Project Manager. NRC C Charnoff Attachment
Director of NRR Prairic Island Nuclear Cet erating Plant De.cember 5, 1988 Attachment
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