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| Entered date | Event description | |
|---|---|---|
| ENS 48921 | 14 April 2013 13:24:00 | At 0620 CDT on 4/14/13, the Unit 1 Sodium Hydroxide Tank outlet valve was found to be shut. This valve isolated the flow path for both trains of containment spray chemical addition and resulted in LCO 3.6.7 (Spray Additive System) not being met, which resulted in a condition reportable pursuant to 10 CFR 50.72(b)(3)(v)(D). At 0651 CDT on 4/14/13, the Unit 1 Sodium Hydroxide Tank outlet valve was restored to its required locked open position and TSAC (Technical Specification Action Conditions) 3.6.7.8 was exited. The licensee has notified the NRC Resident Inspector. |
| ENS 46475 | 13 December 2010 15:07:00 | |
| ENS 46129 | 26 July 2010 22:45:00 | On 7/26/2010 at 2001 (hrs. CDT), Control Room personnel initiated a manual reactor trip from approximately 19% reactor power. Unit 1 was in the process of coming off-line to support Main Generator repair. The generator breaker had just been opened and load transferred to condenser steam dumps when a loss of condenser vacuum occurred. The reactor was manually tripped due to a loss of main condenser vacuum with reactor power above P-10 permissive. All systems functioned as expected. All control rods fully inserted. Main Steam Isolation valves were manually shut. All reactor coolant system parameters are as expected, with reactor coolant temperature being maintained by atmospheric steam dumps. Currently, the plant is at normal operating temperature and pressure with the steam generators being fed by the main feed pumps. Feedwater is being supplied via the condenser and condensate storage tank. There were no lifts of safeties or reliefs during the transient. The plant is in its normal shutdown electrical line-up with no effect on Unit 2. There is no known primary-to-secondary leakage. The cause of the loss of vacuum is under investigation. The licensee has notified the NRC Resident Inspector. |