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On March 24, 2014, during an extent of con … On March 24, 2014, during an extent of condition review for a separate problem evaluation report (PER) for the Browns Ferry Nuclear Plant (BFN), it was discovered that a postulated fire-induced wire-to-wire short of 250V DC control cables associated with 480V AC Shutdown Boards 2B, 3A, and 3B could cause the 480V AC Shutdown Board control power to spuriously transfer and could result in loss of control power to the 480V AC Shutdown Board. In the event of a 10 CFR 50 Appendix R fire, these conditions could result in loss of power to credited safe shutdown equipment that would challenge the ability to provide adequate core cooling during performance of BFN Safe Shutdown Instructions.</br>Roving fire watches have been established as compensatory measures in accordance with the BFN Fire Protection Report.</br>These conditions are being reported pursuant to 10 CFR 50.72(b)(3)(ii)(B). These conditions are also reportable as a 60-day written report in accordance with 10 CFR 50.73(a)(2)(ii)(B). These conditions have been entered into the Corrective Action Program.</br>The NRC Resident Inspector has been notified of this event.Inspector has been notified of this event. +
19:12:00, 24 March 2014 +
49,954 +
18:47:00, 24 March 2014 +
19:12:00, 24 March 2014 +
On March 24, 2014, during an extent of con … On March 24, 2014, during an extent of condition review for a separate problem evaluation report (PER) for the Browns Ferry Nuclear Plant (BFN), it was discovered that a postulated fire-induced wire-to-wire short of 250V DC control cables associated with 480V AC Shutdown Boards 2B, 3A, and 3B could cause the 480V AC Shutdown Board control power to spuriously transfer and could result in loss of control power to the 480V AC Shutdown Board. In the event of a 10 CFR 50 Appendix R fire, these conditions could result in loss of power to credited safe shutdown equipment that would challenge the ability to provide adequate core cooling during performance of BFN Safe Shutdown Instructions.</br>Roving fire watches have been established as compensatory measures in accordance with the BFN Fire Protection Report.</br>These conditions are being reported pursuant to 10 CFR 50.72(b)(3)(ii)(B). These conditions are also reportable as a 60-day written report in accordance with 10 CFR 50.73(a)(2)(ii)(B). These conditions have been entered into the Corrective Action Program.</br>The NRC Resident Inspector has been notified of this event.Inspector has been notified of this event. +
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00:00:00, 24 March 2014 +
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