ML20092K431
| ML20092K431 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 02/18/1992 |
| From: | Parker T NORTHERN STATES POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-89-002, IEB-89-2, NUDOCS 9202250164 | |
| Download: ML20092K431 (3) | |
Text
Northem States Power Company 414 thcollet Mall Mmneapohs, Minnesota SM01-1977 Telephone (012) 330 5500 February 18, 1992 NRC Bulletin 89 02 U S Nuclear Regulatory Conunission Attn:
Document Control Desk Vashington, DC 20555 PRAIRIE IS1AND NUCLEAR CENERATINC P1 ANT Docket Nos, 50 282 License Nos. DPR-42 50 306 DPR-60 Revised Request for Relief From the Schedule Reautrements of NRC Bulletin 84-02
Reference:
Letter from Thomas M Parker (NSP) to U S Nuclear Regulatory Commission, " Updated Request for Relief from the Schedule Requirements of NRC Bulletin 89 02", dated December 31, 1991 The purpose of this letter is to revise the ref erenced request for relief fro'n the schedular requirements of Bulletin 89 02, " Stress Corronion Cracking of liigh llardness Type 410 Stainless Steel Internal Preloaded Bolting in Anchor Darling Valves", for the inspection of a Unit 2 Residual llont Removal pump discharge check valve, in the referenced letter we requested a delay in the inspection of the last residual heat removal pump discharge valve.
This delay was requested because of the unavailability of replacement bushings which were found t.o be missing from the last residual heat removal pump discharge valve that was inspec'ed.
At the time of submittal of the referenced request, we were experiencing difficulty in obtaining replacement bushings from the valve supplier because of problems they had encountered with their source for the bushing material, The valve supplier has since resolved the problems with the material suppliers, and have estimated that replacement bushings manufactured from the stellite material currently used in the valves would be available by May 1992, As an A1 ARA consideration, Northern States Power attempts to minimize the amount of stellite which comes in contact with reactor coolant.
In response to that policy, we have requested that the valve supplier provicie replacement bushings for the Residual 11 eat Removal Pump discharge valves thit are manufactured from a non-stellite material.
The valve manufacturer has estimated that the non stellite bushings will be delivered in the Fall of
- 1992,
~
Director NRR No n a a w ornpany February 18, 1992 Page 2 Neither the stellite or non stellite bushings will be available prior t upcoming Unit 2 refueling outage, scheduled to begin February 19, 1992.
o the Because the Unit 2 residual heat the radiation levels that util be encountered during theremoval system will b
- outage, the Unit 2 residual heat inspection of renioval pump discharge valve will be significantly higher alter the outage.
A delay in the months following the outage would significantly reduce the radiation expinsp received during the insnection.
osure Based on the AIARA considerations discussed above, inspections performed to date, and the results of the as stunmarized in the referenced letter, we feel it is prudent to delay the Bulletin 89 02 inspection of the remaining Unit residual heat removal pump discharge valve until the non stellite repincement 2
bushings are available in the Fall of 1992.
The Unit 2 residual heat2 outage, removal pump discharge valve will be completed prior the Fall 1992 Unit If the non stellite bushings are not available by thatpresently scheduled t o begin in Octo 28, 1992.
02 inspection of the remaining Unit time, the Bulletin 89-valve will still be completed 2 residual heat removal ptunp dischargo will be utilized if necessary. prior to the Unit 2 outage and stellite bushings This revision to our request Bulletin 89 02 was discussed with the NRC Project Manager for Pfor relief from on February 13, 1992.
rairie Island our response to NRC Bulletin 89-02.Please contact us if you have any que.tions related to
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' homas M Parker Manager Nuclear Support Services Regional Administrator - Region III. NRC c:
Senior Resident inspector, NRC NRR Project Manager, NRC J E Silberg
Attachment:
Affidavit of Thomas M Parker
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UNITI:D bTAlLS NUCLEAR RLGULKl0RY COMM!SSION j
NORTilERN SIATES POWl:R COMPANY PRAIRIE ISLAND NUCLEAR GENERATING PIANT DOCKET No. 50 282
$0 306
$UPI'LEMENTAh RESPONSE TO NRC BULLETIN 89 02 Northern States Power Company, a Minnesota corporation, with this letter is submitting supplemental information in response to NRC Bulletin 89 02.
This letter contains no restricted or other defense information, NORTilERN STA 'ES '0Vfik OMPANY
/l,s By
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l Thomas M Parker Manager Nuclear Support Servicen On this8 day ofC 44th /NQbefore me a notary public in and for saidCounty,personallyappeafelThomasMParker, Manager,NuclearSupport Services, and being first duly sworn acknowledged that he in authorized to execute this document on behalf of Northern States Power Company, that he knows the contents thereof, and that to the best of his knowledge, l
information, and belief the statements made in it are true and that it is not interposed for delay,
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