ML22075A219
| ML22075A219 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley, Dresden, Browns Ferry, Surry  |
| Issue date: | 11/29/2021 |
| From: | Woolard S Engine Systems |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML22075A219 (6) | |
Text
ENGINE SYSTEMS, INC.
175 Freight Road Tel ephone: 252/977-2720 Rocky Mount, NC 27804 Fax: 252/446-1134 November 29, 2021 U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555-0001
Subject:
10CFR21 Reporting of Defects and Non-Compliance -
Engine Systems, Inc. Report No. 10CFR21-0133, Rev. 0 Swing Check Valve, P/N ESl50359
Dear Sir/ Madam:
The enclosed report addresses a reportable notification on a swing check valve, P/N ESl50359.
A copy of the report has also been mailed to our affected nuclear customers .
Please sign below, acknowledging receipt of this report, and return a copy to the attention of Document Control at the address above (or, fax to number 252/446-3830) within 10 working days after receipt.
Yours very truly, ENGINE SYSTEMS , INC.
Susan Woolard Document Control Coordinator Please let us know if ANY of your mailing information changes - name of recipient, name of company/facility, address, etc. Mark the changes on this acknowledgment form and send to us by mail or FAX to the number above.
RECEIVED: - - - - - - - - - -
71 DATE:
Quality Performance With Pride
ENGINE SYSTEMS, INC.
175 Freight Road, Rocky Mount, NC 27804 Telephone: 252/977-2720 Fax: 252/446-1134 Report No. 10CFR21-0133 Rev. 0: 11/24/21 10CFR21 REPORTING OF DEFECTS AND NON-COMPLIANCE.
COMPONENT: Swing Check Valve, P/N ESl50359 SYSTEM : Emergency Diesel Generator CONCLUSION: Reportable in Accordance With 10CFR21
<J~~ 11/zt1/z1 Prepared By: Date:
Engineering Manager Reviewed By: a~
Quality Manager Date: 11/211/~1 Quality Performance With Pride
Report No. 10CFR21-0133 Record of Revisions Page : 1 of 1 REV DATE PAGE DESCRIPTION 0 11/24/21 Original Issue.
Report No. 10CFR21-0133 Revision: 0 Date: 11/24/21 Page: 1 of 3 Pursuant to 10 CFR 21.21(d)(4), ESI is presenting the required information as follows:
(i) Name and address of the individual or individuals informing the Commission .
Dan Roberts John Kriesel Quality Manager Engineering Manager Engine Systems Inc. Engine Systems Inc.
175 Freight Rd. 175 Freight Rd.
Rocky Mount, NC 27804 Rocky Mount, NC 27804 (ii) Identification of the basic component supplied within the United States which fails to comply or contains a defect.
Swing Check Valve, PIN ES/50359 (iii) Identification of the firm supplying the basic component which fails to comply or contains a defect.
Engine Systems Inc. (ES/)
(iv) Nature of the defect or failure to comply and the safety hazard which is created or could be created by such defect of failure to comply.
The hinge pin retainer plug used on check valve PIN ES/50359 may exhibit low breakaway torque and thus minimal resistance to loosening when subjected to engine operating vibrations. Consequently, if the plug were to completely dislodge, followed by the associated hinge pin, the pressure boundary of the lube oil system would be compromised and oil would discharge through the 3116" diameter opening. ES/ was notified by a nuclear customer of such an occurrence on a check valve that had been recently installed.
Following notification, ES/ inspected remaining check valves in inventory and confirmed an issue where the plug exhibited low breakaway torque that could potentially lead to unintended loosening.
PIN ES/50359 is a 112" female NPT, stainless steel swing check valve used specifically for EMO engine applications in the gallery fill line between the lube oil cooler and main engine pressure pump discharge elbow. During standby conditions, the valve allows forward flow of heated lube oil to the engine. During engine operation, the valve closes to prevent reverse flow of main lube oil. The plug retains the hinge pin within the valve and utilizes straight threads, thus requiring a sealing washer. The material of the sealing washer is PTFE. Due to the relatively soft nature of the PTFE and small surface area, the applied torque must be minimized to prevent deformation or extrusion. These factors, in conjunction with the relatively low friction coefficient of PTFE, lead to a low breakaway torque and the potential for loosening. See Figure 1 & 2 below for a visual depiction of the swing check valve . Figure 3 on the following page shows a typical installation.
Hinge Pin Plug and PTFE Seal Figures 1 & 2: Vj ew of Swing Check Valve P/N ESl50359
Report No. 10CFR21-0133 Revision : 0 Date : 11/24/21 Page: 2 of 3
~ Un it Accessory Rack Frame (Left Side) 1 / 4" Accessory Rack Frame (Right Side)
I U5-13/16"
- - - 't. Crankshaft Figure 3: Typical Check Valve Installation (item 31 shown)
(v) The date on which the information of such defect or failure to comply was obtained .
November 9, 2021 (vi) In the case of a basic component which contains a defect or fails to comply, the number and location of these components in use at, supplied for, being supplied for, or may be supplied for, manufactured, or being manufactured for one or more facilities or activities subject to the regulations in this part.
Part Qty Customer Customer PO C-of-C Date ESI Order Number Shipped Tennessee Valley Authority -
5947631 9 01/10/20 3020300 Brown's Ferry Exelon - Dresden 00000703-1331 3 3 01/29/20 3020381 Tennessee Valley Authority -
6005163 2 02/10/20 3020391 Brown's Ferry First Energy Corp - Beaver Valley 45560499 1 03/02/20 3020181 Exelon - Dresden 00000703-13326 1 03/02/20 3020484 ESI50359 Dominion Virginia Power -
4500597920 3 07/08/20 3020651 Surry Power Station Exelon - Dresden 726302 1 06/01/20 3020719 1 04/01/21 Energy Harbor Corp - Beaver Valley 45656635 1 04/05/21 3021 639 1 04/1 5/21 Tennessee Valley Authority -
6879386 10 10/01 /2 1 3022282 Brown's Ferry Table 1: List of Customers for PIN ES/50359
Report No. 10CFR21-0133
. Revision : 0 Date: 11/24/21 Page : 3 of 3 (vii) The corrective action which has been , is being, or will be taken ; the name of the individual or organization responsible for the action ; and the length of time that has been or will be taken to complete the action .
For all affected customers:
ES/ recommends a rework of the check valve . Remove the hinge pin retainer plug and ensure plug threads and PTFE washer are free from damage or distortion. Apply Loctite 243 sparingly to clean plug threads then re-install the plug and PTFE washer, using caution to minimize seepage of thread locker. Using a 10mm socket, torque the plug to 5 (+/-0.5) in-lbs and allow the Loctite to cure.
Note: For check valves installed on the engine, this activity should be performed with urgency. It is difficult to predict if the plug will loosen but the issue detected by the customer occurred within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> of operation. Since inspections of other check valves detected low breakaway torque, this indicates plug loosening to be a likely scenario when the valve is subjected to engine operating vibrations. As a reminder, the circulating oil pump must be turned off and oil drained from the line prior to performing rework.
For ES/:
The dedication procedure for this check valve is currently undergoing revision to incorporate the rework activity listed above (use of Loctite 243 and 5 in-lb torque) . This will eliminate unintended plug loosening from future shipments. This is expected to be complete by December 7, 2021 and in all cases, prior to any future shipments.
(viii) Any advice related to the potential defect or failure to comply about the facility, activity, or basic component that has been, is being, or will be given to purchasers or licensees .