ML21209A529
| ML21209A529 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 07/09/2021 |
| From: | Woolard S Engine Systems |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML21209A529 (6) | |
Text
ENGINE SYSTEMS, INC.
175 Freight Road Telephone: 252/977-2720 Rocky Mount, NC 27804 Fax: 252/446-1134 July 9, 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. 10CFR21-0131, Rev. 0 Zinc Anode (installed in heat exchanger P/N 1335BEM2P)
Dear Sir/ Madam:
The enclosed report addresses a reportable notification on a zinc anode (installed in heat exchanger P/N 1335BEM2P).
A copy of the report has also been mailed to our affected nuclear customer.
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 252/446-1134) 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 acknowledgmen t 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. 10CFR21-0131 Rev. O: 07/09/21 10CFR21 REPORTING OF DEFECTS AND NON-COMPLIANCE COMPONENT: Zinc Anode (installed in heat exchanger P/N 1335BEM2P)
SYSTEM: Emergency Diesel Generator CONCLUSION: Reportable in Accordance With 10CFR21
\ II.
Prepared By: _____1/4 ___,t'.AM...
_______ ______ Date: _t-'--'-/_'i}.____Z_I_
()Engineerin g Manager Reviewed By: _ _ __,...* u_ _ _ _ ~f?ejr Quality Assurance M~nager Quality Performance With Pride
Report No. 10CFR21-0131 Record of Revisions Page: 1 of 1 REV DATE PAGE DESCRIPTION 0 07/09/21 Initial issue.
Report No. 10CFR21-0131 Revision: 0 Date: 07/09/21 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.
John Kriesel Dan Robe,ts Engineering Manager Quality 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.
Zinc Anode (installed in heat exchanger PIN 1335BEM2P)
(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.
Two instances of a loose or dislodged zinc anode (protector) were discovered in heat exchangers supplied by ES/. The anodes are installed in the cooling water enter/exit and return channels of the heat exchanger as shown in Figure 1 below:
Zinc anodes in return channel (qty 2 front/ qty 2 rear)
Zinc anodes in enter/exit channel (qty 2 front/ qty 2 rear)
Figure 1: Heat Exchanger P/N 1335BEM2P Each heat exchanger, PIN 1335BEM2P, contains qty 8 zinc anode assemblies that consist of a zinc rod threaded into a steel pipe plug. The zinc acts as a sacrificial anode to protect the pressure boundary metals from degradation due to galvanic corrosion. In the case of a loose or dislodged zinc anode, the zinc rod may become foreign material that remains trapped in the vessel, potentially impacting and damaging the tube ends where they project from the tube sheet. Alternatively, an*
anode located in the exit channel may by carried away from the heat exchanger and potentially damage downstream components.
The heat exchanger provides cooling for the jacket water system of an EMO brand emergency diesel generator set (EOG), see Figures 2 and 3. Each EOG with uses qty 2 heat exchangers in parallel to transfer heat from the engine's jacket water to the station's raw water. Cooling of the jacket water is vital to operation of the EOG to maintain its safety-related function during an emergency event. While a dislodged anode is not expected to immediately impact operability of the heat exchanger, prolonged and repeated clattering within the vessel may damage tubes to the extent the tube-to-tubesheet pressure boundary is affected. This could impact ability to properly cool the EOG and result in failure of the EOG to perform during a safety-event.
(v) The date on which the information of such defect or failure to comply was obtained.
May 11, 2021
Report No. 10CFR21-0131 Revision: 0 Date: 07/09/21 Page: 2 of 3 Heat Exchanger Figure 2: Diesel Generator Skid (front view)
Figure 3: Diesel Generator Skid (side view)
Report No. 10CFR21-0131 Revision: 0 Date: 07/09/21 Page: 3 of 3 (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.
The extent of condition is limited to one part number supplied to one customer on the following orders:
Customer PO ESI Sales Qty Part Number Customer C of C Date Serial Numbers Number Order Shipped 2 05/31/08 13640, 13641 1690 Rel# 00632 3004346 2 06/05/08 13642, 13643 2 06/16/08 13644, 13645 1690 Rel# 00684 3004906 8 03/26/09 13684, 13685, 13686, 13687, 13688, 13689, 13690, 13691 827896 3014168 2 09/29/15 13825, 13826 1335BEM2P TVA- Browns Ferry Nuclear 2399237 3016094 2 02/27/17 13847, 13848 3426174 3017658 2 05/14/18 13881, 13882 4760595 3019113 2 07/01/19 13906, 13907 5225837 3019418 2 12/23/19 13918, 13919 6247312 3020793 2 11/25/20 13945<1>, 13947<1>
6460755 3021138 4 02/24/21 13950, 13951, 13952, 13953 Note (1): Loose or dislodged zinc anodes were detected in these two serial numbers.
Table 1: ESI Supply History of Heat Exchanger P/N 1335BEM2P (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 affected users:
- Heat exchangers installed:
It is recommended to perform an inspection to verify tightness at the zinc rod to pipe plug interface.
The rod should be threaded into the pipe plug snug tight and, if required, may be tightened to a maximum of 15 ft-lbs.
If desired, the zinc rod may be removed and eliminated from the assembly leaving only the steel pipe plug. Inclusion of the zinc anode is not required for the EOG heat exchanger application at TVA-Browns Ferry.
- Heat exchangers in inventory (not-installed):
Prior to installation, perform an inspection to verify tightness at the zinc rod to pipe plug interface.
As mentioned above, the rod may be tightened up to a maximum of 15 ft-lbs. If desired, the zinc rod may be removed and eliminated froin the assembly leaving only the steel pipe plug.
For ES/:
The dedication report will be revised to include verification of tightness of the zinc rod to pipe plug.
This will be completed by July 23, 2021.
(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.
The urgency of the corrective action inspections listed above appears dependent on the installed time of the heat exchangers. Both instances of loose or dislodged anodes occurred within 2 to 3 months of operation (both heat exchangers were installed in March 2021 and issues were detected in May and June). Furthermore, neither ES/ nor the heat exchanger manufacturer are aware of instances of loose anodes. For these reasons, this appears to be an infant mortality.issue isolated to one batch of heat exchangers due to insufficient installed torque when the zinc anode was assembled.