ENS 57981: Difference between revisions

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Latest revision as of 06:20, 14 October 2025

v t e ENS Event
05:00 Oct 9, 2025
Title	Part 21 - Positive Battery Post Separation
Event Description	The following is a summary of information provided by Paragon Energy Solutions via email: In May 2025, Quad Cities experienced positive battery post separation from three cells in a safety related battery string at the post seal nut region. Paragon dispatched engineering resources to provide technical assistance to the station during battery string replacement and to perform an initial assessment of the condition. The current postulated cause of the post separation is due to a corrosion mechanism that is still under investigation. In September 2025, Calvert Cliffs reported separation of a positive post from a cell upon initiation of a service test discharge resulting in electrical arcing at the cell post area. Paragon has not yet identified a defect in the cell post design or manufacturing process which, if corrected, would prevent or mitigate this condition. The affected battery cells have been in service for 14 years and 11 years, respectively. This phenomenon only affects the positive posts on the battery, and the area of the post where corrosion occurs is not visible during routine inspection. Paragon is not stipulating that high cell voltage is the primary indication of the corrosive effect in the positive post, but this indication may allow sites to ensure cells are adequately evaluated for post integrity. Paragon recommends licensees continue normal battery maintenance procedures contained in station instructions. Affected Plants Region 1 - Beaver Valley, Calvert Cliffs, Fitzpatrick, Ginna, Millstone, Nine Mile Point, Seabrook Region 2 - Brunswick, Catawba, McGuire, Robinson, Shearon Harris, Turkey Point Region 3 - Davis Besse, Dresden, LaSalle, Quad Cities Region 4 - Callaway, Comanche Peak, Palo Verde, River Bend, South Texas Project Paragon Contact Information: Richard Knott Vice President, Quality Assurance (518) 450-9706 (C)

ENS 57981 +/-
Where
Paragon Energy Solutions Fort Worth, Texas (NRC Region 4)
Organization:	Paragon Energy Solutions
Reporting

10 CFR 21.21(d)(3)(i), Failure to Comply or Defect
Time - Person (Reporting Time:+51.62 h2.151 days <br />0.307 weeks <br />0.0707 months <br />)
Opened:	Richard Knott 08:37 Oct 11, 2025
NRC Officer:	Kerby Scales
Last Updated:	Oct 11, 2025
57981 - NRC Website
v • d • e

v t e Emergency Notification System
Paragon Energy Solutions with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect
WEEKMONTHYEAR2025-10-09T05:00:00 [Table view]
[ENS list for Paragon Energy Solutions]

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