Event Notification Report for December 21, 2023

TECHNICAL SPECIFICATIONS VIOLATION

The following information was provided by the licensee via phone and email:

"At approximately 1100 CST on December 15, 2023, the facility was discovered to be in violation of a Limiting Condition of Operation (LCO) according to Technical Specification 3.3.2.2, which requires that the static pressure measurement in the confinement exhaust system measure -0.1 inches of water or less during operation. It was discovered that this plant variable was not tied to the PANALARM trip for 'Building Pressure', nor was the sensor output value available in the control room to be checked by operators. The PANALARM trip for 'Building Pressure' was set to a different variable not related to the LCO required value. This condition has existed since 2006.

"The reactor was not in operation at the time of the discovery, and the situation creating this LCO violation is being corrected prior to the next reactor startup."

The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:

The issue was discovered by the vendor when a controller board was being replaced after damage from a power outage.

INITIAL PART 21 REPORT - DEFICIENT FUEL INJECTORS

The following is a synopsis of information was provided by the licensee via phone and email:

Pursuant to 10 CFR 21.21(d)(3)(i), Paragon provided initial notification of a defect associated with the auxiliary feedwater pump diesel engine fuel injectors supplied to Constellation. The injectors were provided to Paragon for refurbishment. Constellation provided Paragon with root cause report # 4703982 on November 12, 2023. The associated failure analysis report documented potential defects with some fuel injectors supplied to Braidwood. These reported deficiencies allowed excessive fuel oil leakage which resulted in diesel lubricating oil system contamination above specified limits. Paragon concluded their evaluation on December 18, 2023, which determined that this condition, if left uncorrected, could contribute to a substantial safety hazard and is reportable in accordance with 10 CFR Part 21.

The extent of condition is limited to the Constellation Braidwood and Byron plants.

Paragon has entered this condition in their corrective action program. Affected injectors at Braidwood have been removed from service and returned to Paragon. Paragon is coordinating with Byron on recommended actions and will follow up with a final notification on or before 1/17/2024.

CONCURRENT REPORT FOR LOW FILTER EFFICIENCY

The following information was provided by the licensee email:

"Pursuant to 10CFR70 Appendix A (c) Framatome is making this concurrent report:

"On December 17, 2023 a routine DOS [di-octyl sebacate] test of one of Framatome's final filter banks had an efficiency of 99.78% which was below the 99.95% efficiency credited by Framatome's radioactive air emissions license. In compliance with Framatome's radioactive air emissions license (RAEL-038), Framatome made the required written notification to the Washington Department of Health (WDOH).

"The loss of efficiency did not cause emissions to be above allowable limits."