ENS 51836

v t e ENS Event
20:45 Mar 30, 2016
Title	Secondary Containment Differential Pressure Outside Required Technical Specification Value
Event Description	At approximately 1545 CDT on 3/30/16, the Main Control Room received numerous annunciators that indicated a trip of the Emergency Reserve Auxiliary Transformer (ERAT) Static VAR Compensator (SVC) caused by a voltage transient on the 138 kV feed due to thunderstorms in the area. As a result of the voltage transient, the Division 1 Fuel Building ventilation (VF) system isolation dampers closed causing a trip of VF supply and exhaust fans. With no running VF fans, secondary containment differential pressure rose to slightly greater than 0 inches water gauge which exceeded the Technical Specification requirement of greater than 0.25 inches vacuum water gauge. The Control Room entered EOP-8, Secondary Containment Control. This event is being reported as a condition that could have prevented fulfillment of a safety function under 10 CFR 50.72(b)(3)(v)(C). Secondary Containment differential pressure was restored within Technical Specification requirements at 1550 CDT by starting the Standby Gas Treatment HVAC (VG) system. The NRC Resident has been notified.

ENS 51836 +/-
Where
Clinton Illinois (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
LER:	05000461/LER-2016-004 Regarding Trip of Emergency Reserve Auxiliary Transformer Static Var Compensator Causes Positive Secondary Containment Pressure Following Lightning Strike on 138 Kv Offsite Source
Time - Person (Reporting Time:+0 h0 days <br />0 weeks <br />0 months <br />)
Opened:	Glenn Benjamin 20:45 Mar 30, 2016
NRC Officer:	Donald Norwood
Last Updated:	Mar 30, 2016
51836 - NRC Website Loading map...
v • d • e

v t e Emergency Notification System
Clinton with 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
WEEKMONTHYEAR2018-03-30T18:05:00 [Table view]
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