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| Start date | Reporting criterion | Title | Event description | System | LER | |
|---|---|---|---|---|---|---|
| ENS 57117 | 22 February 2024 04:00:00 | 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | Part 21 - Emergency Diesel Generator Cylinder Liner Leak | The following is a synopsis of information provided by Engine Systems, Inc. (ESI) via fax and email: On February 22, 2024, an EMD brand cylinder liner developed a jacket water leak following installation on an emergency diesel generator set. The leak occurred at a brazed joint and was detected after post-installation engine testing. Had the leak gone undetected, jacket water may have accumulated in the combustion chamber or airbox and potentially contaminated the engines lubricating oil. Jacket water intrusion into any of these areas is undesirable and could lead to failure of the diesel engine and therefore failure of the emergency diesel generator set. The extent of condition is a single cylinder liner, P/N 9318833, S/N 20D6294 used in the power assembly shown below. Customer: Constellation - Fitzpatrick Customer PO: 703, release 13498 ESI Sales Order: 3021545 Part Number Ordered: 40124898 (Blade Power Pack) Serial Number: 20L0603 ESI C-of-C Date: April 1, 2021 The corrective action: For Fitzpatrick: No action required; the power assembly has been returned to ESI for replacement. For ESI: ESI will revise the dedication package to include additional verifications to prevent reoccurrence. The revision will be implemented within 30 days. Name and contact information: Dan Roberts, Quality Manager Engine Systems Inc. 175 Freight Rd. Rocky Mount, NC 27804 John Kriesel, Engineering Manager Engine Systems Inc. 175 Freight Rd. Rocky Mount, NC 27804 | Emergency Diesel Generator | |
| ENS 57072 | 22 February 2024 04:00:00 | 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | Part 21 - Leaking Cylinder Liner in Emergency Diesel Generator | The following is a summary of the information provided by Engine Systems Inc. (ESI) via facsimile: An EMD (Brand Name: Electro-Motive Diesel) cylinder liner developed a jacket water leak following installation on an emergency diesel generator set at the James A. Fitzpatrick Nuclear Power Plant. The leak occurred at a brazed joint and was detected after post-installation engine testing. Had the leak gone undetected, jacket water may have accumulated in the combustion chamber, airbox, and/or lubricating oil which could have eventually led to failure of the emergency diesel generator set. ESI was the supplier of the EMD cylinder liner (part number: 9318833, serial number: 20D6294). The EMD cylinder was a component of a Blade Power Pack Assembly, part number: 40124898, serial number: 20L0603 Corrective Actions: ESI will revise the dedication package to include additional verifications to prevent reoccurrence. The revision will be implemented within 30 days. Fitzpatrick returned the power assembly to ESI for replacement and no further action is required from Fitzpatrick. Affected Plants: Fitzpatrick. No other sites known to be affected. The name and address of the individuals reporting this information is: John Kriesel Engineering Manager Engine Systems, Inc.; 175 Freight Rd. Rocky Mount, NC 27804 Dan Roberts Quality Manager Engine Systems, Inc.; 175 Freight Rd. Rocky Mount, NC 27804 | Emergency Diesel Generator | |
| ENS 48353 | 27 September 2012 16:12:00 | 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | Part-21 Report - Faulty Master Trip Units, Slave Units, and Resistance Temperature Detectors | On September 27, 2012, the Site Vice President was notified that a 10CFR21 evaluation of thirteen (13) reworked Master Trip Units, Resistance Temperature Detector Units, and Slave Units supplied by Rosemount Nuclear Instruments, Inc. (Rosemount) determined that a non-compliant condition involving a basic component existed. Rosemount informed James A. FitzPatrick Nuclear Power Plant (JAF) that 13 reworked Master Trip Units, Resistance Temperature Detector (RTD) Units and Slave Units were received at JAF which did not comply with their rebuild repair specification. Specifically, epoxy was not applied under certain resistors as required. In accordance with JA FitzPatrick plant procedures, this condition was determined as a 10CFRPart 21 condition involving a defect in a basic component. As noted by an engineering review, some of the applications for the trip units require them to energize to perform the associated safety functions. Therefore, a failure occurrence by an installed non-conforming unit could potentially have an adverse affect on the associated systems' safety/accident mitigation functions. JAF verified that none of the 13 deficient units were installed in any plant systems. Therefore, this condition had no actual safety consequences as the deficiency was identified by Rosemount prior to installation. The 13 units that were received at JAF without the epoxy have been returned to Rosemount for the addition of the epoxy and have subsequently been reworked and returned to JAF. This notification is made pursuant to 10CFR21.21(d)(3)(i).
Subsequent to the original notification dated 9/27/2012, a study was performed by Rosemount (DS-RNII-2012-049). The study analyzed the reported condition of the Master Trip Units for a Static Coefficient Load Analysis and a calculation of the rigidity of the 2-Watt wire-wound resistor when installed without being secured by epoxy. The conclusion was that there is sufficient design margin to ensure that the resistor will remain rigid during qualified seismic conditions. Based on this assessment, there is not a significant safety concern related to the absence of epoxy and the previous 10 CFR 21.21(d)(3)(i) notification may be retracted. The NRC Resident Inspector has been notified. Notified R1DO (Caruso) and Part 21 group. |