The following information was provided by the licensee via email:
Pursuant to 10CFR 21.21 (a)(2), Paragon Energy Solutions, LLC is providing this interim notification of ongoing analysis for Part 21 reportability of a potential defect with a Schneider Electric Medium Voltage VR Type Circuit Breaker Part Number V5D4133Y000.
On February 15, 2024, Paragon completed initial documentation of a potential defect with the subject circuit breaker in which Duke-Oconee had identified failure to close on demand or delayed operation to close with extended application of the remote closing signal. Since the primary safety function of the circuit breaker is to close and maintain continuity of power to downstream loads, failure to close could potentially contribute to a substantial safety hazard.
This is the first reported instance of this failure mode, and Paragon suspects the issue to be related to aging of the circuit breakers lubrication. Paragon requires more time to complete testing and analysis to confirm the failure mode and determine reportability.
Date when evaluation is expected to be complete: 5/03/2024.
Affected licensee: Oconee. Paragon is currently evaluating the extent of condition as it pertains to other plants and equipment that may utilize the same or similar circuit breakers.
- * * UPDATE ON 05/02/24 FROM R. KNOTT TO T. HERRITY VIA EMAIL AND PHONE CALL * * *
Due to inconclusive results, the completion date of the testing is revised to 05/31/2024.
Notified R2DO (Miller) and Part 21/50.55 Reactors (email).