Event Notification Report for June 13, 2014

LOSS OF BOTH TRAINS OF CONTROL STRUCTURE CHILLED WATER

"On 6/13/2014 at 0417 [EDT], Limiting Conditions of Operation were entered on SSES Units 1 and 2 for an inoperable Train of Control Structure Chilled Water for planned maintenance. During clearance order application at 0452 on 6/13/2014, a switching move caused the in service [Division 1] Control Structure Chilled Water Train to trip and be declared inoperable. It was realized that a prior switching move had already rendered the standby train [Division 2] inoperable. There was no equipment failure or misoperation associated with this event. The trip of the running Control Structure Chiller was in accordance with its control logic scheme. This was not identified during the planning phase of this evolution.

"During this time both divisions of Control Structure Chillers were inoperable and were not available to perform the required safety function. This condition also resulted in the inoperability of Control Room Emergency Outside Air Supply System due to the relationship between some of the equipment. This is a condition that, at the time of discovery, could have prevented fulfillment of Safety Functions and is reportable under 50.72(b)(3)(v)(D) as an 8 hour notification.

"The loss of safety functions are based on 1) the SSC is inoperable in a required mode of operation, 2) the inoperability is due to procedural deficiency, and 3) there was no redundant equipment in the same system that was operable.

"One Train of Control Structure Chilled Water and Control Room Emergency Outside Air Supply System were restored to operable status at 0503 on 6/13/2014."

The licensee notified the NRC Resident Inspector.

AGREEMENT STATE REPORT - LOST TRITIUM EXIT SIGNS

The following was received from the State of Wisconsin via email:

"During an inventory on June 13, 2014, the licensee determined a total of 6 tritium exit signs were not accounted for at the facility. One 20 Ci SRB Technologies sign and five 11.5 Ci Safety Light Corporation signs were missing. Three of the signs are known to have been removed during a previous remodeling and are presumed to have been disposed of with the waste. The three other signs are missing from their normal locations. Maintenance staff have been alerted to the missing items and told to look for them in the storage areas. Additional training is being developed that will require any person who removes an exit sign, regardless of type, to return it to the Environmental, Health, and Safety Department for review prior to disposing. A plan is also in place to remove all tritium exit signs from the facility and replace with electrically wired signs. The Wisconsin Radiation Protection Section is continuing to monitor the situation."

Event Report ID: WI 140007

* * * UPDATE FROM KYLE WALTON TO JOHN SHOEMAKER AT 1630 EDT ON 7/1/14 * * *

The State of Wisconsin reported that one of the missing signs has been found and only two signs remain missing. The licensee will continue searching for the missing signs.

Notified the R3DO (McCraw) and FSME Events Resource via email.

THIS MATERIAL EVENT CONTAINS A "LESS THAN CAT 3" LEVEL OF RADIOACTIVE MATERIAL

Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf