ENS 49860
ENS Event | |
|---|---|
13:09 Feb 27, 2014 | |
| Title | Plant Shutdown Required by Technical Specification |
| Event Description | SYSTEM AFFECTED: Battery 201B inoperable at 1040 EST on 2/26/14
ACTUATIONS & THEIR INITIATION SIGNALS: None CAUSES (IF KNOWN): Low cell voltage on cell 27 EFFECT OF EVENT ON PLANT: Inoperable DC Bus ACTIONS TAKEN OR PLANNED: Commence shutdown and cooldown to Mode 5 ADDITIONAL INFORMATION: None Plant shutdown was initiated by failure to meet the action statement of Technical Specification (TS) 3.8.2.3; restore cell 27 to operable within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />. The failure to meet the action statement placed the plant in a 36 hr. to cold shutdown time clock. At 0809 on 2/27/14, the licensee commenced down powering the unit to meet the TS requirement. If the cell is not recovered, the licensee expects to achieve cold shutdown by 2300 on 2/27/14. Their 36 hr. clock expires at 0040 on 2/28/14. The plant is stable with all other safety busses available via onsite and offsite power. The licensee notified the State of Connecticut, Waterford dispatch and the NRC Resident Inspector.
At 1347 [EST] on February 27, 2014, Millstone Power Station Unit 2 exited the shutdown action statement for Technical Specification (TS) 3.8.2.3 'D.C. Distribution-Operating'. The 125-volt DC bus train has been restored to operable status. Operators had reduced plant power to approximately 16%. The plant is increasing power and is presently at approximately 27% power. The NRC Resident Inspector has been notified. Notified R1DO (DeFrancisco). |
| Where | |
|---|---|
Millstone  Connecticut (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-4.05 h-0.169 days <br />-0.0241 weeks <br />-0.00555 months <br />) | |
| Opened: | Jason Ashburn 09:06 Feb 27, 2014 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Feb 27, 2014 |
| 49860 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (74 %) |
WEEKMONTHYEARENS 544492019-12-18T00:29:00018 December 2019 00:29:00
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