ML23023A036
| ML23023A036 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley, Millstone, Dresden, Davis Besse, Peach Bottom, Oconee, Mcguire, Palisades, Perry, Indian Point, Catawba, Harris, Grand Gulf, Byron, Pilgrim, Arkansas Nuclear, Braidwood, Limerick, River Bend, Vermont Yankee, Waterford, Robinson, Quad Cities, Zion, FitzPatrick, McGuire, LaSalle  |
| Issue date: | 01/19/2023 |
| From: | Apostolescu V Velan |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| Download: ML23023A036 (1) | |
Text
Velan Inc.
7007 Cote de Liesse, Montreal, QC H4T 1G2 Canada Tel: +1 514 748 7743 Fax: +1 514 748 8635 www.velan.com January 19, 2023 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555-0001 Attention:
Document Control Desk
Subject:
Notification Gentlemen, On October 24, 2022, Entergy informed us via e-mail that one of our butterfly valves, model W19-0CP13-KCDN-B0001, was found to have a number of fasteners loose, namely those holding the laminated seal in place by way of a seal ring.
This was observed on one valve in a lot of six.
Our evaluation indicates that there are several credible failure modes resulting from these fasteners being finger tight, as described by personnel at Arkansas One Unit 1 (ANO Unit 1):
- 1.
Increased leak rate across the valve seat, proportional with the number of fasteners lacking the nominal torque
- 2.
Potential limitation in open/close range of travel as result of seal or retaining ring sliding out of position, resulting in severe leakage across the seat
- 3.
Potential for fasteners to come completely loose and become entrained in the flow, subsequently causing damage to equipment located downstream.
The consequences and the severity of these potential failure modes cannot be evaluated as we do not know the system layout and function. Entergy have already remedied the situation, and have received a copy of the interim notification.
We have compiled a list of utilities that have received valves of similar design, and assembled in the same facility. The list is annexed.
Our records show that no claim was made by those listed concerning the fasteners not being tightened to torque, or for performance issues linked to the credible failure modes, and we therefore believe this to be an isolated case, but we cannot be absolutely certain. As the consequences and the severity of these potential failure modes cannot be evaluated in absence of information regarding the system layout and function, we will send notifications to those identified in the annex, with our recommendation to check the torque on these fasteners at the next scheduled maintenance.
We are taking the necessary preventative actions.
For any additional information on this matter please contact me at +1 438 817-9908 or at victor.apostolescu@velan.com.
Sincerely yours, Sincerely, Victor Apostolescu, Eng.
Vice-president, Quality Assurance CC: B. Carbonaro, Y. Lauzé, M. Lauzon, B. Masterson
Annex 1 DATE CUSTOMER NAME VALVE FIGURE NO.
DATE SHIPPED 5/Mar/12 DUKE ENERGY CAROLINAS, LLC L18-0CP02-FCDN 10-Feb-12 5/Mar/12 DUKE ENERGY CAROLINAS, LLC L24-0CP02-FCDN 10-Feb-12 8/Jun/12 FIRST ENERGY CORPORATION L16-0CP02-ACDN-M 5-Jun-12 25/Sep/13 FIRST ENERGY CORPORATION W21-0CP13-DCDN-G 20-Sep-13 25/Sep/13 FIRST ENERGY CORPORATION L24-0CP13-XCDN-M0001 20-Sep-13 25/Sep/13 FIRST ENERGY CORPORATION L22-0CP13-XCDN-M0001 20-Sep-13 3/Jul/14 EXELON GENERATION W14-0CP02-ACAN 23-Jun-14 11/Apr/15 FIRST ENERGY CORPORATION W21-0CP13-DCDN 1-Apr-15 19/Feb/16 GEORGIA POWER COMPANY W15-0CP13-FCDN 17-Feb-16 19/Feb/16 GEORGIA POWER COMPANY W15-0CP13-FCDN 17-Feb-16 19/Jul/16 DUKE ENERGY CAROLINAS L24-0CP02-FCDN 18-May-16 24/Aug/16 FIRST ENERGY CORPORATION W21-0CP13-DCDN 8-Aug-16 22/Sep/16 GEORGIA POWER COMPANY W15-0CP13-FCDN 9-Sep-16 21/Oct/16 GEORGIA POWER COMPANY W15-0CP13-FCDN 18-Apr-16 21/Oct/16 FIRST ENERGY CORPORATION L15-0CP02-ACDN 3-Aug-16 21/Oct/16 FIRST ENERGY CORPORATION L15-0CP02-ACDN 3-Aug-16 21/Oct/16 FIRST ENERGY CORPORATION L15-0CP02-ACDN 3-Aug-16 21/Oct/16 FIRST ENERGY CORPORATION L15-0CP02-ACDN 3-Aug-16 2/Mar/17 DUKE ENERGY CAROLINAS, LLC L18-0CP02-FCDN 20-Dec-16 15/Aug/18 FIRST ENERGY CORPORATION W21-0CP13-DCDN-G0001 19-Jun-18 22/Aug/19 FIRST ENERGY CORPORATION L22-0CP13-XCDN 14-Aug-19 28/Nov/19 GEORGIA POWER W19-0CP13-FCDN 22-Nov-19 28/Nov/19 GEORGIA POWER W19-0CP13-FCDN 25-Nov-19 7/Aug/20 DUKE ENERGY L36-0CP13-XCDN 7-Aug-20 5/Oct/20 DUKE ENERGY L42-0CP13-XCDN 2-Oct-20 02-16-2021 DOMINION L20-0DP02-XCDA 02-16-2021 02-16-2021 DOMINION L20-0DP02-XCDA 02-16-2021 02-16-2021 DOMINION L20-0DP02-XCDA 02-16-2021 02-16-2021 DOMINION L20-0DP02-XCDA 02-16-2021 02-16-2021 DOMINION L20-0DP02-XCDA 02-16-2021 02-16-2021 DOMINION L20-0DP02-XCDA 02-16-2021 02-22-2021 DOMINION L20-0DP02-XCDA 02-22-2021 02-24-2021 DOMINION L20-0DP02-XCDA 02-24-2021 04-28-2021 DOMINION L20-0DP02-XCDA 04-28-2021 04-29-2021 DOMINION L20-0DP02-XCDA 04-29-2021 05-27-2021 DOMINION L20-0DP02-XCDA 05-27-2021 10/5/2022 ENTERGY W21-0CP13-KCDN 10/5/2022 10/5/2022 ENTERGY W21-0CP13-KCDN 10/5/2022 16/5/2022 ENTERGY W19-0CP13-KCDN 16/5/2022 10/6/2022 ENTERGY W21-0CP13-KCDN 10/6/2022 10/6/2022 ENTERGY W21-0CP13-KCDN 10/6/2022