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A review of industry operating experience … A review of industry operating experience regarding the impact of unfused Direct Current (DC) ammeter circuits has determined the described condition to be applicable to the Palisades Nuclear Plant resulting in a potentially unanalyzed condition with respect to 10 CFR 50 Appendix R analysis requirements.</br>The original plant wiring design and associated analysis for the Class 1E batteries ampere indications, located in the cable spreading room at Palisades, do not include overcurrent protection features to limit the fault current. In the postulated event, a fire could cause one of the ammeter wires to short to ground. Simultaneously, it is postulated that the fire causes another DC wire from the opposite polarity on the same battery to also short to ground. This could cause a ground loop through the unprotected ammeter wiring. This event could result in excessive current flow (i.e., heating) in the ammeter wiring to the point of causing a secondary fire in the raceway system. The secondary fire could adversely affect safe shutdown equipment and potentially cause the loss of the ability to conduct a safe shutdown as required by 10 CFR 50 Appendix R.</br>Interim compensatory measures (i.e., fire tours) have been implemented for affected areas of the plant.</br>This condition is being reported in accordance with 10 CFR 50.72(b)(3)(ii)(B).</br>The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
20:52:00, 7 November 2013 +
49,516 +
16:32:00, 7 November 2013 +
20:52:00, 7 November 2013 +
A review of industry operating experience … A review of industry operating experience regarding the impact of unfused Direct Current (DC) ammeter circuits has determined the described condition to be applicable to the Palisades Nuclear Plant resulting in a potentially unanalyzed condition with respect to 10 CFR 50 Appendix R analysis requirements.</br>The original plant wiring design and associated analysis for the Class 1E batteries ampere indications, located in the cable spreading room at Palisades, do not include overcurrent protection features to limit the fault current. In the postulated event, a fire could cause one of the ammeter wires to short to ground. Simultaneously, it is postulated that the fire causes another DC wire from the opposite polarity on the same battery to also short to ground. This could cause a ground loop through the unprotected ammeter wiring. This event could result in excessive current flow (i.e., heating) in the ammeter wiring to the point of causing a secondary fire in the raceway system. The secondary fire could adversely affect safe shutdown equipment and potentially cause the loss of the ability to conduct a safe shutdown as required by 10 CFR 50 Appendix R.</br>Interim compensatory measures (i.e., fire tours) have been implemented for affected areas of the plant.</br>This condition is being reported in accordance with 10 CFR 50.72(b)(3)(ii)(B).</br>The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
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100 +
00:00:00, 7 November 2013 +
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16:32:00, 7 November 2013 +
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20:52:00, 7 November 2013 +
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