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A post-fire safe shutdown (PFSSD) circuit … A post-fire safe shutdown (PFSSD) circuit analysis identified the potential for a fire in the Control Room to cause multiple proper polarity hot shorts causing the Pressurizer Power Operated Relief Valves (PORV) to open. This postulated failure would require at least three separate 'smart' hot shorts including 1) a positive external hot short, 2) a negative external hot short, and 3) a short across the control room hand switch to cause each PORV to open. This could result in a loss of coolant accident inside the containment building.</br>This circuit analysis also identified that a fire in the control room could cause the recirculation dampers associated with the 'B' Essential Service Water Pump Room and 'B' Emergency Diesel Generator Room to fail open, closed, or anywhere in between. This could cause the room temperatures to drop below the minimum or rise above maximum design temperatures depending on ambient conditions.</br>Compensatory measures are established for early detection and extinguishment of a fire associated with these circuits in the Control Room. Procedure changes are also being developed for Control Room Evacuation.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
21:35:00, 17 December 2010 +
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17:38:00, 17 December 2010 +
21:35:00, 17 December 2010 +
A post-fire safe shutdown (PFSSD) circuit … A post-fire safe shutdown (PFSSD) circuit analysis identified the potential for a fire in the Control Room to cause multiple proper polarity hot shorts causing the Pressurizer Power Operated Relief Valves (PORV) to open. This postulated failure would require at least three separate 'smart' hot shorts including 1) a positive external hot short, 2) a negative external hot short, and 3) a short across the control room hand switch to cause each PORV to open. This could result in a loss of coolant accident inside the containment building.</br>This circuit analysis also identified that a fire in the control room could cause the recirculation dampers associated with the 'B' Essential Service Water Pump Room and 'B' Emergency Diesel Generator Room to fail open, closed, or anywhere in between. This could cause the room temperatures to drop below the minimum or rise above maximum design temperatures depending on ambient conditions.</br>Compensatory measures are established for early detection and extinguishment of a fire associated with these circuits in the Control Room. Procedure changes are also being developed for Control Room Evacuation.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
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21:35:00, 17 December 2010 +
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