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On December 13, 2016, Units 1 and 2 were i … On December 13, 2016, Units 1 and 2 were in Mode 1 (i.e., Run mode) at 98 percent and 97 percent of rated thermal power, respectively. At that time, shift personnel were notified that structural supports for the 2D Control Room air conditioning system condenser were corroded. An operability assessment found the affected air conditioning system inoperable due to the effect on its seismic qualification. Technical Specifications (TS) 3.7.4, Condition A, was entered. On January 30, 2017, the 1D air conditioning system was found with similar conditions. Since the conditions were determined to have existed for longer than the TS allowable out of service time, the plant was in a condition prohibited by the TS. Since more than one air conditioner had been inoperable concurrently, the safety function of maintaining Control Room habitability could have been prevented from being fulfilled during a seismic event. This event resulted from trapped moisture in contact with the steel supports and exposure to the local marine environment which corroded support steel to the point that seismic qualifications were compromised. All affected support steel was replaced by February 2, 2017. The remaining air conditioner was inspected and found acceptable. Guidance for initiating work requests for corroded support members will be enhanced.corroded support members will be enhanced. +
December 13, 2016 +
On December 13, 2016, Units 1 and 2 were i … On December 13, 2016, Units 1 and 2 were in Mode 1 (i.e., Run mode) at 98 percent and 97 percent of rated thermal power, respectively. At that time, shift personnel were notified that structural supports for the 2D Control Room air conditioning system condenser were corroded. An operability assessment found the affected air conditioning system inoperable due to the effect on its seismic qualification. Technical Specifications (TS) 3.7.4, Condition A, was entered. On January 30, 2017, the 1D air conditioning system was found with similar conditions. Since the conditions were determined to have existed for longer than the TS allowable out of service time, the plant was in a condition prohibited by the TS. Since more than one air conditioner had been inoperable concurrently, the safety function of maintaining Control Room habitability could have been prevented from being fulfilled during a seismic event. This event resulted from trapped moisture in contact with the steel supports and exposure to the local marine environment which corroded support steel to the point that seismic qualifications were compromised. All affected support steel was replaced by February 2, 2017. The remaining air conditioner was inspected and found acceptable. Guidance for initiating work requests for corroded support members will be enhanced.corroded support members will be enhanced. +
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