Event Notification Report for June 17, 2014

STACK RADIATION MONITOR TAKEN OUT OF SERVICE FOR PLANNED MAINTENANCE

At 0749 EDT, Millstone Station Unit 2 removed the Stack Radiation Monitor RM-8169 from service for planned maintenance. Maintenance and testing were completed and the Stack Radiation Monitor was returned to service at 0945 EDT.

The licensee informed both State and local agencies and the NRC Resident Inspector.

TECHNICAL SPECIFICATION SHUTDOWN DUE TO LOSS OF A AND B CONTROL BAY CHILLER TRAINS

"At 1729 [CDT] on June 17, 2014 Browns Ferry Units 1, 2, and 3 initiated actions to commence a reactor shutdown to comply with TS LCO [Technical Specifications Limiting Condition of Operation] 3.0.3. TS LCO 3.0.3 was entered at 1632 and was required due to the concurrent loss of 'A' and 'B' Control Bay Chiller units which resulted in loss of cooling to the U1 and U2 4kV Shutdown Board Rooms. Required actions for the loss of cooling to the U1 and U2 4kV Shutdown Board Rooms is to declare the electrical equipment in the 4kV Shutdown Board Rooms inoperable. The declaration of inoperability of the equipment supported by the U1 and U2 4kV Shutdown Boards resulted in TS LCO 3.0.3 for Units 1, 2 and 3. TS LCO 3.0.3 requires actions to be initiated within one hour to place the units in MODE 2 within 10 hours; MODE 3 within 13 hours; and MODE 4 within 37 hours.

"This event requires a 4 hour report IAW 50.72(b)(2)(i), 'The initiation of any nuclear plant shutdown required by the plant's Technical Specifications.'

"The NRC Resident Inspector has been notified.

"Service Request 899734 was initiated in the Corrective Action Program."

The 'B' Control Bay Chiller train was operating when the control room entered the Loss of Chilling procedure. The 'A' Control Bay Chiller train was started to supply Control Bay cooling, and the 'A' train unit tripped during start.

The failure affected unit-3 because each unit has a 50% capacity common standby gas treatment system. The loss of the the U1 and U2 4kV shutdown boards failed two of the three systems.

* * * UPDATE PROVIDED BY TODD BOHANAN TO JEFF ROTTON AT 2154 EDT ON 06/17/2014 * * *

"'A' Control Bay Chiller declared operable at 2035 CDT. TS LCO 3.0.3 exited and plant shutdowns have been secured."

The licensee will be notifying the NRC Resident Inspector. Notified R2DO (Haag)

ITEMS RELIED ON FOR SAFETY (IROFS) BYPASSED

"At approximately 1900 hours (EDT) on June 17, 2014, an employee was observed improperly operating two (2) spring return valves identified as Items Relied On For Safety (IROFS) and Safety Related Equipment (SRE). The spring return valves were observed to be 'propped' open. These spring return valves were intended to be manually operated to prevent [a chemical solution] from overfilling a column, spilling to the floor, and causing an acute chemical exposure. No actual overflow occurred. Although the operator was observing and monitoring the filling of the column, the operation of the spring return valves was improper. Operations in the area have been placed in a safe condition and an investigation is underway. This condition was determined to be reportable at 0910 (Eastern Time) on June 18, 2014.

"There were no actual or potential safety consequences to the public or the environment. There were no actual safety consequences to the workers. The potential safety consequences to the workers include exposure to [a hazardous chemical] solution.

"The licensee notified the NRC Resident Inspector and NRC Region 2."

NFS Event (PIRCS) No. - P44298