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PART 21 - POSITIVE BATTERY POST SEPARATION … PART 21 - POSITIVE BATTERY POST SEPARATION</br>The following is a summary of information provided by Paragon Energy Solutions via email:</br>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. </br>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.</br>Affected Plants</br>Region 1 - Beaver Valley, Calvert Cliffs, Fitzpatrick, Ginna, Millstone, Nine Mile Point, Seabrook</br>Region 2 - Brunswick, Catawba, McGuire, Robinson, Shearon Harris, Turkey Point</br>Region 3 - Davis Besse, Dresden, LaSalle, Quad Cities</br>Region 4 - Callaway, Comanche Peak, Palo Verde, River Bend, South Texas Project</br>Paragon Contact Information:</br>Richard Knott</br>Vice President, Quality Assurance</br>(518) 450-9706 (C)</br>*** UPDATE ON 10/31/2025 AT 0711 EDT FROM RICHARD KNOTT TO SAMUEL COLVARD ***</br>The following is a summary of information provided by Paragon via email:</br>Further analysis is needed and expected to be completed by 12/15/2025. Oconee was added to the list of affected nuclear power plants. Interim advice to licensees was given.</br>Notified R1DO (Young), R2DO (Mckown), R3DO (Ziolkowski), R4DO (Vossmar), and the Part 21/50.55 Reactors group.</br>*** UPDATE ON 12/15/2025 AT 1128 EST FROM RICHARD KNOTT TO ERNEST WEST ***</br>The following is a summary of information provided by Paragon via email:</br>The evaluation of the defect is complete, and the following corrective actions are being taken:</br>1. Paragon will establish improved controls to ensure assembly of the post seal is per the design. Estimated completion date is 12/31/2025.</br>2. Paragon will issue a revised instruction and operations manual recommending enhanced monthly and annual visual inspection criteria. The estimated completion date is 02/16/2026. </br>Notified R1DO (Carfang), R2DO (Nielsen), R3DO (Orlikowski), R4DO (Agrawal), Part 21/50.55 Reactors (email).(Agrawal), Part 21/50.55 Reactors (email).
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PART 21 - POSITIVE BATTERY POST SEPARATION … PART 21 - POSITIVE BATTERY POST SEPARATION</br>The following is a summary of information provided by Paragon Energy Solutions via email:</br>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. </br>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.</br>Affected Plants</br>Region 1 - Beaver Valley, Calvert Cliffs, Fitzpatrick, Ginna, Millstone, Nine Mile Point, Seabrook</br>Region 2 - Brunswick, Catawba, McGuire, Robinson, Shearon Harris, Turkey Point</br>Region 3 - Davis Besse, Dresden, LaSalle, Quad Cities</br>Region 4 - Callaway, Comanche Peak, Palo Verde, River Bend, South Texas Project</br>Paragon Contact Information:</br>Richard Knott</br>Vice President, Quality Assurance</br>(518) 450-9706 (C)</br>*** UPDATE ON 10/31/2025 AT 0711 EDT FROM RICHARD KNOTT TO SAMUEL COLVARD ***</br>The following is a summary of information provided by Paragon via email:</br>Further analysis is needed and expected to be completed by 12/15/2025. Oconee was added to the list of affected nuclear power plants. Interim advice to licensees was given.</br>Notified R1DO (Young), R2DO (Mckown), R3DO (Ziolkowski), R4DO (Vossmar), and the Part 21/50.55 Reactors group.</br>*** UPDATE ON 12/15/2025 AT 1128 EST FROM RICHARD KNOTT TO ERNEST WEST ***</br>The following is a summary of information provided by Paragon via email:</br>The evaluation of the defect is complete, and the following corrective actions are being taken:</br>1. Paragon will establish improved controls to ensure assembly of the post seal is per the design. Estimated completion date is 12/31/2025.</br>2. Paragon will issue a revised instruction and operations manual recommending enhanced monthly and annual visual inspection criteria. The estimated completion date is 02/16/2026. </br>Notified R1DO (Carfang), R2DO (Nielsen), R3DO (Orlikowski), R4DO (Agrawal), Part 21/50.55 Reactors (email).(Agrawal), Part 21/50.55 Reactors (email).
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