ENS 55347
ENS Event | |
|---|---|
16:00 May 11, 2021 | |
| Title | Part 21 Initial Report - Deviation Identified Loose Zinc Anodes Installed in Heat Exchangers for Diesel Generators |
| Event Description | The following is a summary of the defect described in an initial report received from the vendor via facsimile:
The vendor notified the NRC of a defect involving two instances of loose or dislodged zinc anodes (P/N 1335BEM2P) supplied by the vendor. The anodes are installed in the cooling water enter and exit and return channels of the jacket water heat exchanger of the emergency diesel generator. Each heat exchanger contains eight 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 corrective action being recommended are as follows: 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 EDG heat exchanger application at TVA-Browns Ferry. This component was supplied to the Browns Ferry Nuclear Power Plant. Point of contact: Dan Roberts Quality Manager Engine Systems Inc. 175 Freight Rd. Rocky Mount, NC 27804 (252) 977-2720 |
| Where | |
|---|---|
| Engine Systems, Inc Rocky Mt., North Carolina (NRC Region 1) | |
| Organization: | Engine Systems, Inc |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+1415.38 h58.974 days <br />8.425 weeks <br />1.939 months <br />) | |
| Opened: | Dan Roberts 15:23 Jul 9, 2021 |
| NRC Officer: | Brian P. Smith |
| Last Updated: | Jul 9, 2021 |
| 55347 - NRC Website | |
Engine Systems, Inc with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
WEEKMONTHYEARENS 565382023-03-28T04:00:00028 March 2023 04:00:00
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