05000457/LER-2023-001, Train B Auxiliary Feedwater Pump Was Inoperable Due to Degraded Oil in the Crank Case
| ML23321A224 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 11/17/2023 |
| From: | Constellation Energy Generation |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML23321A222 | List: |
| References | |
| BW230053 LER 2023-001-00 | |
| Download: ML23321A224 (1) | |
| Event date: | |
|---|---|
| Report date: | |
| 4572023001R00 - NRC Website | |
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Abstract
On September 1, 2023, an oil sample from the 2B auxiliary feedwater (AF) pump diesel engine was obtained. On September 21, 2023, the oil sample results were received which indicated oil viscosity and fuel percent in the Fault range, and a confirmatory sample was drawn. On September 22, 2023, resample results were received confirming the original analysis, and at 1157 Operations declared the 2B AF train INOPERABLE and entered Technical Specification (TS) Limiting Condition for Operation (LCO) 3.7.5, "Auxiliary Feedwater (AF) System," Condition A, "One AF train inoperable." Maintenance was performed to repair fuel leaks and crankcase oil was changed. The 2B AF train was returned to service on September 23, 2023, at 1340, and at 1501 LCO 3.7.5 was exited.
The cause of the event was vendor performance and quality control gap in refurbishing fuel injectors. The corrective action was repair of the 2B AF diesel engine lube oil fuel leaks. A supplement to this report will be provided as more information is available.
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(See NUREG-1022, R.3 for instruction and guidance for completing this form http://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr1022/r3/) Page 3 of 3
E. Corrective Actions
The 2B AF diesel engine fuel leaks into lube oil were repaired and performed a crankcase oil change.
Further corrective actions are still under consideration and any revisions or additions will be reported in a supplement to this report.
F. Previous Occurrences
April 10, 2019, Braidwood Unit 1, the 1B AF pump engine degrading trend in fuel oil content was identified. Evaluation identified the cause as most likely a leaking fitting within the rocker/valve cover. No operability or reportability issues resulted. The cause of the leakage in 2019 is unrelated to the current issue.
G. Component Failure Data
Manufacturer Nomenclature Model Mfg. Part Number Paragon Energy Solutions Diesel engine - fuel injector 16V149T1 R5229660