Event Notification Report for May 12, 2014

PLANNED MAINTENANCE ON SAFETY PARAMETER DISPLAY SYSTEM

"At 0845 [CDT] during planned maintenance, the annunciators which would indicate flooding in the Emergency Core Cooling System (ECCS) Pump Rooms to the max safe water level in the rooms were disabled. These max safe water level alarms are used to assess the emergency action level (EAL) entry condition (HA4) for flooding (ALERT classification).

"Compensatory measures are in place to perform periodic walk downs of RHR A, RHR B, RHR C, HPCS, LPCS, RCIC rooms and the fuel building basement once per shift to verify no leakage. Additionally, the annunciator for max normal water level is operational and pump run times are still available in the Main Control Room to indicate increased leakage into the ECCS rooms. This max normal water level alarm is used to assess the EAL entry condition (HU4) for flooding (Unusual Event classification) and EOP-8 entry.

"Since the operator compensatory actions that were established are not proceduralized, then this is reportable as a loss of emergency assessment capability under 10 CFR 50.72(b)(3)(xiii).

"The expected return to service time of all alarms is 2300 CDT."

The licensee will notify the NRC Resident Inspector.

AGREEMENT STATE REPORT - STUCK SHUTTER ON A PROCESS GAUGE

"On May 14, 2014, the licensee notified the Agency [Texas Department of Health] that when it was locking out sources on May 12, 2014, for a shutdown it was unable to close the shutter on one of its Ohmart-Vega model SHLG-2 fixed nuclear gauges which contained a 3 curie cesium-137 source. The licensee contacted the manufacturer. A service company came to the licensee's facility on May 14, 2014, and closed the shutter, removed the gauge, and placed it in storage.

"The licensee will send the gauge to the manufacturer for repair. The gauge normally operates with the shutter in the open position. No one received any exposure as a result of this event. Additional information will be provided as it is obtained in accordance with SA-300."

TX # I-9193

* * * UPDATE PROVIDED BY ART TUCKER TO JEFF ROTTON VIA EMAIL AT 1249 EDT ON 06/18/2014 * * *

"A review of the licensee's written report found that a second gauge had failed during this event. The second gauge was an Ohmart-Vega model OHM-S-A2 gauge containing a 3000 milliCurie cesium - 137 source. The licensee stated that while trying to close the shutter on this gauge, the pin for the actuator handle broke and the handle came loose from the gauge. The handle was placed on the gauge and held in place with wire. The shutter was left in the open position. On May 14, 2014, the manufacturer was able to free the shutter and place it in the closed position. The gauge was removed from its mounting and package for shipment by the manufacturer. No significant exposure was received by any individual as a result of this event. Additional information will be provided as it is received in accordance with SA-300."

Notified R4DO (Hay) and FSME Resources (email).

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

"During a review from industry operating experience it was identified that there are three additional unprotected DC control circuits for non safety related DC motors which are routed from the turbine building to other separate fire areas (this is in addition to the one circuit that was previously identified and submitted under event #50059). Fuses used to protect the motor power conductors appear to be inadequate to protect the control conductors. The concern is that under fire safe shutdown conditions, it is postulated that a fire in one area can cause short circuits potentially resulting in secondary fires or cable fires in other areas where the cables are routed. The secondary fires or cable failures are outside the assumptions of the 10 CFR 50 Appendix R Safe Shutdown Analysis.

"This condition is reportable as an 8 hour ENS report in accordance with 10 CFR 50.72(b)(3)(ii)(B) as an unanalyzed condition. Compensatory measures (fire watches) have been implemented for affected areas of the plant.

"The NRC Resident Inspector has been notified."

TRITIUM CONFIRMED IN WATER SAMPLES ON-SITE UNDERGROUND

"On May 12, 2014, at 1458 CDT, River Bend Station management determined that tritium confirmed to be present in water samples taken from in-leakage into the below-ground elevation of the turbine building basement, through an underground pipe penetration, was reportable in accordance with NEI 07-07, Ground Water Protection Initiative. The leakage was tested for gamma and tritium activity. No gamma contamination was detected. Tritium was measured at 28,270 picocuries per liter. The source and volume of the radioactive in-leakage is unknown.

"The leakage into the plant is currently being contained, and actions are in progress to identify the source. The Louisiana Department of Environmental Quality was notified at 1500 CDT today [5/12/14]. This event is being reported in accordance with 10 CFR 50.72(b)(2)(xi) as an event requiring notification of the state government.

"The NRC Resident Inspector has been notified."

UNIT 2 STACK HIGH RANGE RADIATION MONITOR REMOVED FROM SERVICE FOR PRE-PLANNED MAINTENANCE

The Unit 2 Stack High Radiation Monitor, RM-8168, was removed from service for pre-planned maintenance. There are no actuations associated with this Radiation Monitor.

Testing was completed and the radiation monitor was restored to operable at 1013 EDT, on 5/12/14.

The licensee has informed the NRC Resident Inspector and applicable State and Local authorities.