Semantic search
| Entered date | Event description | |
|---|---|---|
| ENS 51074 | 15 May 2015 23:48:00 | Class 1E A/C Unit SGK05A cools safety related electrical train 'A' and was found tripped at 2148 (CDT). As a result, the following supported safety related electrical equipment were declared inoperable: 4.16 KV Bus NB01, 480 Volt Buses NG01 and NG03, 120 volt Instrument AC Inverters and Buses NN11, NN13, NN01 and NN03, 125 VDC Chargers and Buses NK11, NK13, NK01 and NK03. T/S 3.0.3 was entered from T/S 3.8.7 due to two out of four 120 volt AC Inverters (NN11 and NN13) being inoperable. All electrical systems listed above remain available but are declared inoperable due to inadequate room cooling capability. Plant shutdown to mode 5 commenced at 2244 (CDT). No major equipment is out-of-service. All systems have functioned normally. Plant is currently at 99% with power ramping down. Plant must be in mode 3 by 0448 CDT. No compensatory measures have been established. The NRC Resident Inspector has been notified. See EN #51071 for an earlier T/S required shutdown required at 0436 CDT on 5/15/15, due to the same conditions.
For both EN 51071 and 51074, the low lube oil pressure switch tripped the SGK05A unit. Oil pressures were verified to be normal and the SGK05A unit was successfully started. The plant shutdown each time was terminated. A fault in the Electronic Oil Pressure control which monitors the low lube oil pressure switch was identified. A jumper has been installed that bypasses the oil switch while maintenance is being conducted. The unit was declared functional but degraded. Indication of low oil pressure is still provided. The licensee notified the NRC Resident Inspector. Notified the R4DO (Okeefe). |
| ENS 51071 | 15 May 2015 07:22:00 | Class 1E A/C Unit SGK05A cools safety related electrical train 'A' and was found tripped at 0436 (CDT). As a result, the following supported safety related electrical equipment were declared inoperable: 4.16 KV Bus NB01, 480 volt Buses NG01 and NG03, 120 volt Instrument AC Inverters and Buses NN11, NN13, NN01 and NN03, 125 VDC Chargers and Buses NK11, NK13, NK01 and NK03. T/S 3.0.3 was entered from T/S 3.8.7 due to two out of four 120 volt AC Inverters (NN11 and NN13) being inoperable. All electrical systems listed above remain available but are declared inoperable due to inadequate room cooling capability. Plant shutdown to mode 5 commenced at 0530 (CDT). No major equipment is out-of-service. All systems have functioned normally. Plant is currently at 95 % power ramping down. Plant must be in mode 3 by 1136 CDT. No compensatory measures have been established. The NRC Resident Inspector has been notified. |
| ENS 50863 | 4 March 2015 14:11:00 | A non-licensed, non-supervisory supplemental worker was found with synthetic urine on their person during a search at the security entrance station. The individual's access was terminated on site and in PADS. The NRC Resident Inspector and NRC Regional Inspector was notified. |