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On April 19, 2016, at 2159 hours, Secondar … On April 19, 2016, at 2159 hours, Secondary Containment became inoperable, requiring an action of Technical Specification (TS) 3.6.4.1 to restore the system to an operable status in four hours. The TS 3.6.4.1 Condition A for an inoperable Secondary Containment was entered because Reactor Building (RB) Zone II differential pressure (dP) was below the required TS limit of >1= 0.25 inches of vacuum water gauge (in. w.g.), which does not meet the Surveillance Requirement (SR) 3.6.4.1.1. The Zone II supply system outside air (intake) louver XD-27586 was then adjusted and the Zone II dP returned to a steady 0.29 in. w.g.</br></br>of vacuum, which was above the required TS limit. The TS 3.6.4.1, Condition A for inoperable Secondary Containment was exited at 2222 hours.</br></br>The event was reported to the NRC on April 20, 2016 in accordance with 10 CFR 50.72(b)(3)(v)(C) under Event Notification 51872, for the loss of a safety function. There is no redundant Secondary Containment system. This LER is being submitted in accordance with 10 CFR 50.73(a)(2)(v)(C), for an event or condition that could have prevented the fulfillment of the safety function of Secondary Containment to control the release of radioactive material. No actual consequences to the health and safety of the public occurred and this event will not be counted as a safety system functional failure (SSFF) for the NRC performance indicator.</br></br>The cause of this event was determined to be less than adequate Operating Procedure instructions for the RB HVAC systems, for instructions that follow fan swaps. Planned corrective action includes revising Operating Procedure instructions for the Units 1 and 2 RB HVAC systems.ctions for the Units 1 and 2 RB HVAC systems. +
On April 19, 2016, at 2159 hours, Secondar … On April 19, 2016, at 2159 hours, Secondary Containment became inoperable, requiring an action of Technical Specification (TS) 3.6.4.1 to restore the system to an operable status in four hours. The TS 3.6.4.1 Condition A for an inoperable Secondary Containment was entered because Reactor Building (RB) Zone II differential pressure (dP) was below the required TS limit of >1= 0.25 inches of vacuum water gauge (in. w.g.), which does not meet the Surveillance Requirement (SR) 3.6.4.1.1. The Zone II supply system outside air (intake) louver XD-27586 was then adjusted and the Zone II dP returned to a steady 0.29 in. w.g.</br></br>of vacuum, which was above the required TS limit. The TS 3.6.4.1, Condition A for inoperable Secondary Containment was exited at 2222 hours.</br></br>The event was reported to the NRC on April 20, 2016 in accordance with 10 CFR 50.72(b)(3)(v)(C) under Event Notification 51872, for the loss of a safety function. There is no redundant Secondary Containment system. This LER is being submitted in accordance with 10 CFR 50.73(a)(2)(v)(C), for an event or condition that could have prevented the fulfillment of the safety function of Secondary Containment to control the release of radioactive material. No actual consequences to the health and safety of the public occurred and this event will not be counted as a safety system functional failure (SSFF) for the NRC performance indicator.</br></br>The cause of this event was determined to be less than adequate Operating Procedure instructions for the RB HVAC systems, for instructions that follow fan swaps. Planned corrective action includes revising Operating Procedure instructions for the Units 1 and 2 RB HVAC systems.ctions for the Units 1 and 2 RB HVAC systems. +
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Secondary Containment Inoperability due to Failure to Meet Surveillance Requirement 3.6.4.1.1 +
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