ML20073F494
| ML20073F494 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 09/23/1994 |
| From: | Pelletier J VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| BVY-94-96, GL-89-10, NUDOCS 9410030123 | |
| Download: ML20073F494 (1) | |
Text
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' VERMONT YANKEE NUCL, EAR POWER CORPORATION Ferry Road. Brattleboro. VT 05301-7002 REPLV 70 ENGINEERING OFFICE h
580 MAIN STREET BOLTON, MA 01740 (508) 779-6711 September 23,1994 BW 94-96 Unitsd States Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555
References:
(a)
License No. DPR-28 (Docket No. 50-271)
(b)
Letter, USNRC to [All Licensees], Generic Letter 89-10, Supplement 6, NW 94-51, dated March 8,1994 (c)
Letter, WNPC to USNRC, BW-94-81, dated August 15,1994
SUBJECT:
GENERIC LETTER 89-10: UPDATE OF SCHEDULE COMMITMENTS in Reference (c), Vermont Yankee provided information regarding our revised schedule for our MOV Program in accordance with the guidance provided in Generic Letter 89-10, Supplement 6 [ Reference (b)]. Reference (c) was submitted to NRC without the required 10CFR50.54(f) oath and affirmation statement, as detailed in Reference (b).
Accordingly, Reference (c) is attached to this letter and is being resubmitted under oath and affirmation, as required by the Generic Letter supplement.
We regret any confusion this may have caused. Should you have any additional questions with regard to our MOV Program or revised schedule commitments, please contact this office.
Sincerely, VERMONT YANKEE NUCLEAR POWER CORP.
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James P. Pelletier Vice President, Engineering
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cc:
USNRC Region I Administrator
,2 FO4 USNRC Resident inspector - WNPS h
USNRC Project Manager - WNPS
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g STATE OF VERMONT
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Then personally appeared before me, James P. Pelletier, who, being duty sworn, did state that he'is Vice resident Engineering, of Vermont Yankee Nuclear Power Corporation, that he is duly authorized to execute and file i
in the name and on the behalf of Vermont Yankee Nuclear Power Corporation, and that the statements therein his knowledge and belief.
(
Gina M. Fontaine, Notary Public l
9410030123 940923 t
PDR ADOCK 05000271 P
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ERMONT YANKEE NUCLEAR POWER CORPORATION Ferry Road Brattleboro, VT 05301-7002 7[
ENGINE R NGOFFICE V
$80 MAIN STREET BOLTON, MA 01740 (508) 779-6711 August 15,1994 BVY 94-81 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555
References:
(a)
License No. DPR-28 (Docket No. 50-271)
(b)
Letter, USNRC to All Licensees, Generic Letter 89-10, (NW 89-144), dated June 28,1989 (c)
Letter, WNPC to USNRC, (BW 93-14), dated February 5,1993 (d)
Letter, USNRC to WNPC, (NW 93-83), dated June 8,1993 (e)
Letter, USNRC to WNPC, (NW 93-84), datec'.bne 8,1993 (f)
Letter, WNPC to USNRC, (BW 93-116), dated October 12,1993 (g)
Letter, USNRC to WNPC, inspection Report No. 50-271/93-16, (NW 93-227), dated December 29,1993 (h)
Letter, USNRC to All Licensees, Generic Letter 89-10, Supplement 6, (NW 94-51), dated March 8,1994
Subject:
Generic Letter 89-10: Update of Schedule Commitments in Generic Letter 89-10 [ Reference (b)] and its supplements, the NRC requested licensees to establish a program to ensure the operability of all safety-related motor-operated valves (MOVs) under design basis conditions. The Generic Letter also recommended that each licensee complete all design basis reviews, analyses, verifications, tests and inspections within 5 years or three refueling outages from the date of the letter. The scheduled completion date for the Vermont Yankee GL 89-10 MOV Program is May 1995, following the Spring 1995 Refueling Outage.
In References (c) and (f), Vermont Yankee provided a summary of the status of the Vermont Yankee GL 89-10 Program and a schedule for the completion of the remaining activities.
This status and schedule was also presented to members of your staff in May 1993 [ References (d) and (e)] and reviewed during an inspection performed at our facility in October 1993 [ Reference (g)]. The purpose of this letter is to provide an updated status and schedule for completion of our remaining MOV activities.
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.f VERMONT YANKEE NUCLEAR POWER CORPORATION U,S. Nuclear Regulatory Commission August 15,1994 Page 2 With the exception of in-situ differential pressure testing, all items provided in References (c) and (f) have been completed or are on schedule for completion by May 1995. As of June 30,1994, procedures were developed or revised as necessary to formalize the details of the MOV maintenance program, including post maintenance testing enhancements and establishment of an MOV trending program. Revision to the design basis reviews is presently on schedule for completion by December 31, 1994 and preparation of design change documents is presently in progress for margin improvement modifications to be performed during the Spring 1995 Refueling Outage.
Vermont Yankee had previously scheduled to perform in-situ differential pressure testing on ten valves prior to June 28,1994. The present schedule calls for the testing to be completed during the Spring 1995 Refueling Outage. In accordance with Generic Letter 89-10, Supplement 6 [ Reference (h)], the following information is l
provided regarding our revised schedule:
1.
The original schedule called for testing of six MOVs prior to and during the Fall 1993 Refueling Outage. This testing of the six MOVs has been completed, with the results summarized in Reference (g).
2.
Based on initial reviews performed in 1991, testing of the remaining four MOVs was to be performed during plant operations in the first six months of 1994.
However, further detailed reviews have identified that testing during plant i
operations would require the plant to be placed in a condition not permitted by l
Technical Specifications. Therefore, the testing will be performed during the i
Spring 1995 Refueling Outage when plant shutdown conditions exist.
3.
The purpose of in-situ differential pressure testing was to provide additionai i
information to support the continued use of the MOVATS Statistical Database and to confirm the conservatism of the existing Vermont Yankee methodology for determining MOV switch settings. As discussed in References (d) and (e),
use of the MOVATS Statistical Database had provided adequate margin when compared to industry equations and differential pressure testing results.
However, References (d) and (e) also requested Vermont Yankee to pay particular attention to gate valves with the lowest calculated margin. Based on our review, justification for the use of industry equations and valve factors to determine MOV thrust requirements was completed in August 1993. The valve betors equal or exceed 0.5 for gate valves and equal 1.1 for globe valves. As such, the purpose of in-situ differential pressure testing now is to provide additional information to support the current valve factors and to confirm the conservatism of the existing VermontYankee methodology for determining MOV i
switch settings.
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VERMONT YANKEE NUCLEAR POWER CORPORATION U,.S. Nuclear Regulatory Commission August 15,1994 Page 3 This revised schedule is considered acceptable as functionality has been confirmed for all MOVs within the scope of our GL 89-10 Program through the combination of static and dynamic testing. All MOVs within the scope of our GL 89-10 Program have been diagnostically tested under static conditions with thrust settings determined from industry equations and the above valve factors. in-situ differential pressure testing performed to date and industry differential pressure testing results support the current valve factors and confirm the conservatism of our existing MOV switch setting methodology.
We trust that this information is satisfactory; however, should you have any questions or desire any additional information on this issue, please do not hesitate to contact us.
Sincerely, VERMONTYANKEE NUCLEAR POWER CORPORATION James P. Pelletier Vice President - Engineering cc:
USNRC Regional Administrator, Region i USNRC Resident inspector, VYNPS USNRC Project Manager, VYNPS I