ML20203L837
| ML20203L837 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 03/02/1998 |
| From: | Reid D VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| BVY-98-23, GL-89-10, NUDOCS 9803060261 | |
| Download: ML20203L837 (2) | |
Text
I VERMONT YANKEE M
NUCLEAR POWER CORPORATION 185 Old Ferry Road, Brailleboro, VT 05301-7002 (802) 257 5271 March 2,1998 BW 98-23 United States Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555
References:
(a)
Letter, WNPC to USNRC, BW 97144, dated November 3,1997 (b)
Generic l.etter 8910, " Safety-Related Mowr-Operated Valve Testing and Surveillance"
Subject:
- Vermont Yankee Nuclear Power Station License No. CPR 28 (Docket 50 271)
Generic Letter 8910 Follow up Tasks The purpm of this letter is to document the status of the four motor-operated valve (MOV) related -
tasks identified in Reference (a). Thoes four tasks are in support of Vermont Yankee's work in response to Generic Lo'ter (Gl.) 89-10 [ Reference (b)] closure, and were committed to during tlee NRC's GL 8910 follow up inspection exit meeting of October 17,1997. The four tasks, as set forth in Reference (a), are:
1.-
" Vermont Yankee will update the currer MOV Program Plan to ensure a process is in place to incorporate the results of future valve testing into the design (component) calculations, as appropriate.
2.
" Vermont Yankee will revise existing (component) calculations to reflect the statistically derived results of test data for each past dynamicaliy tested valve. Any resultant changes to calculated switch settings for thrust or torque will be evaluated against currt,nt as left r,ettings.
3.
" Vermont Yankee will use bounding (95% confidence) rate of loading (load sensitive behavior) data from previously tested globe valvos and apply this information to other non-testable globe valves. Any resultant changes to calcuiated switch settings for thrust or torque will be evaluated against current as-left settings.
4.
" Vermont Yankee will complete the EPRI Performance Prediction Methodology (PPM) on all applicable non-tested valves and apply the resultant differential pressure thrust values, if higher than ulculated in the W comp,raent calculation (s), in the determination of design basis switch settings."
This letter constitutes Vermont Yankee's notification, Ir, accordance with Reference (a), that Tasks 1, 2 and 3 have been completed. Work on Task 4 currently is in the final stages of completion. The EPRI Performance Prediction Methodology has been completed on all applicable non-tested valves. The resultant differential pressure thrust values have been comparod to the W component calculations and the results are being assessed in preparation for the upcoming spring RFO. We wl!! notify you by letter no later tb* 1 March 30,1998 of hav;ng completed this assessment of results.
9903060261 980302 I
PDR ADOCK 05000271-O ll\\\\ll.\\ll.llil.llllllk:51I.Ip;A A
VERMONT Y ANKEE NUCLEAR POWER CORPORATION Docket No. 50-271 BW 96 23 Pa0e iof 2 t
Should you have any questions or desire additional information, please contact this office, Sincerely, VEF.MONT YANKEE NUCLEAR POWER CORPORATION Y
b i.
.ffg Donald Reid Senior Vice President, Operations cc:
l'3NRC Project Manager, WNPS USNRC Region I, Administrator USNRC Resident inspector, WNPS VT Department of Public Service i
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