Event Notification Report for March 11, 2012

TECHNICAL SUPPORT CENTER BACKUP DIESEL GENERATOR DECLARED NON-FUNCTIONAL

"On March 11, 2012, a maintenance test of the Technical Support Center (TSC) diesel generator was performed. This diesel generator supplies backup A/C power to the TSC in the event of a loss of normal power. During this test, with the diesel generator supplying power to the TSC, two unexpected momentary losses of normal lighting to the TSC were observed. Following this event, the TSC diesel generator was declared non-functional.

"High-priority actions to troubleshoot and repair the TSC diesel generator were taken following this event. However, as of 1200 CDT on March 16, 2012, troubleshooting activities are still ongoing, and the cause of the event has not yet been identified.

"Normal power to the TSC has been available throughout this event, and the TSC is considered functional. However, due to the duration of the TSC diesel generator non-functionality, Callaway Plant is reporting this condition in accordance with 10 CFR 50.72(b)(3)(xiii) for a loss of emergency assessment capability.

"Please note that, in the event of a complete loss of power to the TSC concurrent with a plant emergency, the designated backup facilities will be used in accordance with the Callaway Plant emergency preparedness program procedures.

"The NRC Resident Inspector has been notified."

OFFSITE NOTIFICATION TO STATE REQUIRED BY NPDES PERMIT FOR A BYPASS DISCHARGE

"Facility: Westinghouse Electric Company LLC (WEC), Commercial Fuel Fabrication Facility, Columbia SC, low enriched (less than or equal to 5.0 wt.% U-235) fuel fabricator for commercial light water reactors. License: SNM-1107.

"Time and Date of Event: March 11, 2012 approximately 0900

"Reason For Notification:

"On March 12, 2012, the Westinghouse Environmental Engineer was notified that the level readings of the South Lagoon indicated that a leak has developed in the South Lagoon liner. This liner was recently replaced. The South Lagoon is one of the lagoons used for settling solids from treated process wastewater prior to discharge. As the lagoons are located downstream of the Columbia plant wastewater radiological treatment systems, the wastewater in the lagoons is below the 10 CFR Part 20 radioactive materials discharge limits. However, the final discharge monitoring station required by the permit for chemicals are located downstream of the settling lagoons and such a leak is therefore an unanticipated bypass. The current sample analysis of the South Lagoon wastewater reflect the activity is < 4.6 x10 (-7) ÁCi / ml and chemical results are within permit limits.

"Liquid discharges from the Columbia Plant are regulated with regard to chemical pollutants through the SC-DHEC/EPA administered NPDES (National Pollutant Discharge Elimination System) permit SC#0001848. Westinghouse is required to notify SC-DHEC of unanticipated bypass conditions in accordance with Permit.

"Notification to NRC is being made based on 10 CFR70 Appendix A, Section (c) Concurrent Reports:

"' Any event or situation, related to the health and safety of the public or onsite personnel, or protection of the environment, for which a news release is planned or notification to other government agencies has been or will be made shall be reported to the NRC Operations Center concurrent to the news release or other notification.'

"As Found Condition: See reason for notification.

"Summary of Activity:

- Liquid inflows to the South Lagoon have been rerouted to other authorized locations
- Westinghouse is emptying the South Lagoon through the normal monitored effluent discharge point.
- The liner vendor has been contacted and arrangements are in progress for the vendor to conduct necessary inspections and repairs as soon as practicable.
- Westinghouse has initiated additional monitoring of the wells in close proximity of the South Lagoon to better assess any potential environmental impact.
- The event has been entered into the plant's Corrective Action Process and a thorough review will be performed to identify the cause of the event.

"Conclusions

- The problem was identified by Westinghouse personnel.
- At no time was the health or safety to any employee or member of the public in jeopardy.
- SC-DHEC has been notified."

AGREEMENT STATE REPORT - ERROR IN DOSE CALCULATION AND UNDERDOSE ADMINISTRATION

The following was received from the Commonwealth of Virginia via fax:

"Event description: On March 18, 2014, the licensee identified an error in a dose calculation for high dose rate (HDR) treatments administered to a patient on March 11-12. The initial report from the licensee indicates the patient was administered two out of a total of six prescribed fractionated doses. An error was made in planning the correct dwell position for the two fractions. The administered dose differed from the prescribed dose (was less than) by more than 20 percent. The licensee plans to correct for the underdose during the remaining fractions. The licensee is investigating if the dose to tissues other than the treatment site may have met the definition of a medical event."

Virginia Event Report ID No.: VA-14-0002

A Medical Event may indicate potential problems in a medical facility's use of radioactive materials. It does not necessarily result in harm to the patient.