Operationally Significant NRC Event Notification Report for November 15, 2013 - Five Event Reports

MCGUIRE: MANUAL REACTOR TRIP DUE TO INDICATION OF DROPPED CONTROL RODS

On November 14, 2013, at 1313 Eastern Standard Time, Unit 1 was manually tripped from 100% power due to indications of [four] dropped control rods.

SAINT LUCIE: MANUAL REACTOR TRIP DUE TO LOW LEVEL IN THE 2B STEAM GENERATOR

On November 14, 2013 at 1218 EST, Unit 2 was manually tripped due to a lowering 2B Steam Generator level caused by the spurious closure of 2B Main Feedwater Isolation Valve HCV-09-2A.

DRESDEN: PRIMARY CONTAINMENT ISOLATION VALVE LEAK TEST FAILURE

On November 14, 2013, both the 2-220-58B Feed Water Inboard Check Valve and the 2-220-62B Feed Water Outboard Check Valve failed Local Leak Rate Testing (LLRT) acceptance criteria. These valves are considered primary containment isolation valves and, as such, are required to ensure that an adequate primary containment boundary is maintained.

SALEM: POSTULATED HOT SHORT FIRE EVENT THAT COULD ADVERSELY IMPACT SAFE SHUTDOWN EQUIPMENT

A review of industry operating experience regarding the impact of unfused Direct Current (DC) ammeter circuits has determined the described condition is applicable to the Salem Nuclear Power Plant resulting in an unanalyzed condition with respect to 10 CFR 50 Appendix R. The original plant wiring design and associated analysis for ammeters associated with the station batteries are not provided with overcurrent protection features to limit the fault current.

WATTS BAR: POSTULATED FIRE INDUCED FAILURE OF CENTRIFUGAL CHARGING PUMPS

During analysis of Watts Bar Nuclear (WBN) Unit 2 fire protection features, it was revealed that a potential fire induced failure of centrifugal charging pumps could occur in Unit 1.
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