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On September 22, 2016 at 03:20, a Nuclear … On September 22, 2016 at 03:20, a Nuclear Plant Operator (NPO) reported that Reactor Building Zone II differential pressure (dP) was steady at 0.15 inches water gauge (WG) resulting in entry into Technical Specification 3.6.4.1. Operations determined that the flow control damper (PDD27522A) for the "A" Zone II equipment exhaust fan (2V206A) was sticking, resulting in Zone II dP not being properly controlled. The linkage for the damper was agitated and the damper moved to control dP as designed. Operations placed the "B" division fan (2V206B) in service. Following the fan swap, dP held steady at 0.31 inches WG with 2V206B in service and 2V206A in standby. Technical Specification 3.6.4.1 was cleared at 03:42.</br></br>This event was reported in accordance with 10 CFR 50.72(b)(3)(v)(C) as a condition that could have prevented fulfillment of a safety function (EN 52255). The condition also requires a Licensee Event Report (LER) in accordance with 10 CFR 50.73(a)(2)(v)(C).</br></br>The cause of the event was age related degradation of the brass bushing and grease hardening in the damper linkage. Corrective actions include initiating work orders to disassemble, inspect, and replace the brass bushings for the remaining similar dampers. A Preventive Maintenance strategy will be evaluated following completion of the inspections of the remaining dampers.</br></br>There were no actual consequences to the health and safety of the public as a result of this event.y of the public as a result of this event. +
On September 22, 2016 at 03:20, a Nuclear … On September 22, 2016 at 03:20, a Nuclear Plant Operator (NPO) reported that Reactor Building Zone II differential pressure (dP) was steady at 0.15 inches water gauge (WG) resulting in entry into Technical Specification 3.6.4.1. Operations determined that the flow control damper (PDD27522A) for the "A" Zone II equipment exhaust fan (2V206A) was sticking, resulting in Zone II dP not being properly controlled. The linkage for the damper was agitated and the damper moved to control dP as designed. Operations placed the "B" division fan (2V206B) in service. Following the fan swap, dP held steady at 0.31 inches WG with 2V206B in service and 2V206A in standby. Technical Specification 3.6.4.1 was cleared at 03:42.</br></br>This event was reported in accordance with 10 CFR 50.72(b)(3)(v)(C) as a condition that could have prevented fulfillment of a safety function (EN 52255). The condition also requires a Licensee Event Report (LER) in accordance with 10 CFR 50.73(a)(2)(v)(C).</br></br>The cause of the event was age related degradation of the brass bushing and grease hardening in the damper linkage. Corrective actions include initiating work orders to disassemble, inspect, and replace the brass bushings for the remaining similar dampers. A Preventive Maintenance strategy will be evaluated following completion of the inspections of the remaining dampers.</br></br>There were no actual consequences to the health and safety of the public as a result of this event.y of the public as a result of this event. +
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