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| Entered date | Event description | |
|---|---|---|
| ENS 52600 | 8 March 2017 20:13:00 | This is a non-emergency notification from Waterford 3. On March 8, 2017 at 1627 (CST) Technical Specification (TS) 3.5.2 action 'c' was entered due to both trains of Low Pressure Safety Injection (LPSI) being inoperable. This TS action requires one train of LPSI be restored within 1 hour or be in at least Hot Standby within the next 6 hours. It was identified that LPSI train B was inoperable due to SI-135B, Reactor Coolant Loop 1 Shutdown Cooling Warmup Valve, being found open. At the time of discovery, LPSI train A was inoperable for pre planned maintenance, but available and awaiting operability retest. The station was in compliance with TS 3.5.2 action 'a'. Maintenance workers were scheduled to work Sl-135A Reactor Coolant Loop 2 Shutdown Cooling Warmup Valve, and inadvertently began work on Sl-135B and manually opened the valve which resulted in the LPSI Train B being inoperable. Once identified by Operations Control Room staff, the valve (SI-135B) was placed in the closed position and stroke tested to ensure operability. TS 3.5.2 action 'c' was exited at time 1705. The station remained in compliance with TS 3.5.2 action 'a'. The licensee notified the NRC Resident Inspector. |
| ENS 52336 | 31 October 2016 18:07:00 | On October 31, 2016, an informal, voluntary communication was made to the Louisiana Department of Environmental Quality (LDEQ) and the Saint Charles Parish Emergency Operating Center concerning a spill of greater than 100 gallons (estimated 150 gallons total) of Tritium contaminated water to the storm drains located within the Protected Area. Tritium activity was 8.201E-06 micro Ci/ml and no detectable gamma activity. The spill lasted approximately 5 minutes before the pump moving the tritium contaminated water was secured. The contaminated water came from the Condensate Polisher Backwash Storage Tank and discharged from a (loose) hose connection going to a baker tank located within the protected area. The licensee has notified the NRC Resident Inspector. |
| ENS 51492 | 23 October 2015 12:04:00 | The following is excerpted from LER 2015-007 submitted by the licensee (see related EN #51348): On October 9, 2015, Waterford 3 received information from the external evaluation concerning the Generator Differential Current Transformer. The evaluation concluded that a manufacturing defect internal to the current transformer was the cause of the failure. On October 22, 2015, engineering evaluation determined the manufacturing defect could create a substantial safety hazard, as defined in 10 CFR 21, and provided the site vice president information of the defect the same day. Additional information identified in the report is as follows: Constructor - Westinghouse Type KIR-60 current transformer, style 7524A01G16, serial number 28218571; Defect and safety hazard - There were voids found in the insulation, and the thickness of the insulation material around the fault area appeared reduced when compared to the other areas of the current transformer. There is only one transformer of this type remaining installed in the plant. Scheduled replacement is no later than November 15, 2015. |
| ENS 51464 | 9 October 2015 21:59:00 | At 1800 (CDT) on October 9, 2015 a polling test was initiated in Saint Johns Parish to test the circuitry of the installed sirens. During the polling test no sirens are expected to sound as it is only a circuitry test. Siren number SJ39 inadvertently sounded for 15 to 20 minutes, and no others. Saint Johns Parish notified the parish residents that the sounding of the siren was inadvertent via a Parish wide cable television channel and a press release. A contract vendor has disabled the siren and will troubleshoot and repair starting on October 12, 2015. All remaining sirens within Saint Johns Parish remain operational and capable of being activated when required. 0% of the population is affected by the loss of this siren due to siren overlap. Time to repair and restore siren SJ39 to service is still being investigated. This event is reportable pursuant to 10CFR 50.72 (b)(2)(xi), News Release or Notification of Other Government Agency. The NRC Resident Inspector has been notified. |
| ENS 51295 | 6 August 2015 18:47:00 | At 1200 CDT, on August 6th, 2015, during the monthly test of Emergency Plan sirens in Saint Charles Parish (county), all sirens failed to actuate when required. There are a total 73 sirens of which 37 sirens are in Saint Charles Parish, which covers approximately 49 percent of the total population within the Waterford 3 10-mile emergency planning zone. The siren vendor is currently investigating to repair the issue. Waterford 3 still maintains 100 percent backup notification capabilities. The Saint John the Baptist Parish Sirens remain fully operational. The Saint Charles Parish Emergency Manager has been notified. This event did not result in any adverse impact to the health and safety of the public. The Waterford 3 and Saint Charles Parish Emergency Response Plans include back-up processes to provide warning to affected areas, if required, in the event of the loss of sirens. The NRC Resident Inspector has been notified. |
| ENS 51116 | 3 June 2015 21:36:00 | This is a non-emergency notification from Waterford 3. At 1705 (CDT) the reactor was manually tripped in anticipation of an automatic trip due to loss of main feedwater pump 'A'. The plant is currently in mode 3 and stable with emergency feedwater feeding and maintaining both steam generators due to an automatic emergency feed actuation signal. During the trip, the 'B' electrical safety and non safety busses did not automatically transfer from the unit auxiliary transformer to the startup transformer causing a loss of off-site power to the 'B' electrical busses. This resulted in a loss of main feedwater pump 'B'. The 'B' emergency diesel generator started as designed and reenergized the 'B' safety related buses. The plant entered the emergency operating procedure for loss of main feedwater. Off-site power has been restored to the 'B' safety and non safety busses, and the emergency diesel generator 'B' is secured. All control rods fully inserted into the core following the trip. Decay heat is being removed by the main condenser using the turbine bypass valves. The electric plant is in a normal shutdown lineup. The licensee has notified the NRC Resident Inspector. |