ML20059M108
| ML20059M108 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 09/27/1990 |
| From: | Parker T NORTHERN STATES POWER CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| IEB-89-002, IEB-89-2, NUDOCS 9010030156 | |
| Download: ML20059M108 (3) | |
Text
.
i N0f9 tem SMes Power %
414 Nicollet Man i
Minneapolis, Minnesota 65401 1927 Telephone (612) 3D5500 September 27, 1990 Bulletin 89 02 1
i Director of Nuclear Reactor Aegulation
,U S Nuclear Re5ulatory Commission Attn: Document Control Desk 1
Washington, DC 20555 i
i PRAIRIE ISLAND NUCLEAR CENERATING PIANT Docket Nos. 50 282 License Nos. DPR 42 j
50 306 DPR 60 Upd'ated Request for Relief From the Schedule Reauirements of Bulletin 89-09 l
1
Reference:
Letter from Thomas M Parker (NSP) to Director of Nuclear Reactor i
Regulation (NRC), " Request for Relief from the Schedule Requirements of Bulletin 89 02, Stress Corrosion Cracking of liigh llardness Type 410 Stainless Steel Internal Preloaded Bolting in Anchor Darlin6 Valves", datud February 16, 1990.
The purpose of this letter is to request relief from the schedular requirements of Bulletin 89 02 for the inspection of the Unit 2 Residual Heat Removal Pump discharge check valves. We committed in the referenced letter to complete inspections of the Residual lleat Removal Pump discharge check valves in accordance with the bulletin requirements during the next refueling outage for each unit that began 180 days after receipt of *he bulletin (Fall 1990 for Unit 2 and Spring 1991 for Unit 1).
We-request sch-Jular relief from this schedule due to the lack of availability of replacement retaining block studs.
The Residual lleat Removal Pump discharge valves are Crane 8" Swing check valves similar in design and material to the Anchor Darling check valves specifically addressed by Bulletin 89 02.
In response to the inspection requirements of Bulletin 69 02, we have elected to replace all retaining block studs in the affected swing check valves with bolts of an improved material and to inspect the removed bolts. Ilowever, due to unanticipated difficult 1y is obtaining replacement bolts, we are unable to replace the Unit 2 Residual lleat Removal Pump discharge check valve bolts within the-inspection schedule required by Bulletin 89-02.
Due to A1 ARA considerations and no degradation of bolts inspected to date (eight valves), we feel it is prudent to delay the inspections until replacement studs are available.
9010030156 900927
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PDR ADOCK 05000282 Q
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s Northem States Power Company l
Director NRR September 27, 1990 Page 2 r
t The replacement bolts are en order and are expected to be received on site by March 1991. Provided there tre no additional procurement elated delays, the affected Residual lleat Remov,il Pump discharge check valve bolts vi,11 be replaced on both units prior to May 31, 1991.' The delays in completion of our l
response to Bulletin 89 02 were discussed with the NRC Project' Manager for l
Prairie Island on September 6, 1990.
Please contact us if you have any questions related to our response to l.
Bulletin 89 02.
l l
/hrw Thomas M Parker l
Manager Nuclear Support Services c: Regional Administrator Region III, NRC Senior Resident Inspector, NRC NRR Project Manager, N3C G Charnoff
Attachment:
Affidavit of Thomas M Parker I
N r
a UNITED STATES NUCLEAR REGULATORY COMMISSION NORTHERN STATES POWER COMPANY PRAIRIE ISLAND NUCLEAR CENERATINC PLANT DOCKET NO. 50 282 50 306 SUPPLEMENTAL RESPONSE TO BULLETIN 89 02 Northern States Power Company, a Minnesota corporation, with this letter is submitting supplemental information in response to Bulletin 89 02.
This letter contains no restricted or other defense information.
l NORTHERN STATES P0 COMPANY By rb Thomas M Park'er Manager Nuclear Support Services t
on this U day o to lh I d'8kdbeforemeanotarypublicir 9 for said County, personalhy sopeared Thomas M Pt.rker, Manager, Nucleo. Support Services, and being first duly sworn acknowledged that he is authorized to l
execute this document on behalf of Northern States Power Company, that.he knows the contents thereof, and that to the best of his knowledge,.
information, and belief the statements nado in it are true and that it is not l
interposed for dela'.
7
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