ENS 51886
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ENS Event | |
|---|---|
22:54 Apr 26, 2016 | |
| Title | High Pressure Coolant Injection System Declared Inoperable |
| Event Description | At 1736 [CDT] on 26 April 2016, a licensed operator performing a control room panel walkdown noted the green standby light for the HPCI [High Pressure Coolant Injection] Auxiliary Oil Pump (AOP) was not illuminated. The bulb was replaced and the replacement bulb did not illuminate. A non-licensed operator (NLO) was dispatched to the local 250VDC starter rack. The NLO discovered the green standby light on the 250VDC starter rack had failed. An attempt was made to start the AOP with the control switch. The pump did not start. The AOP is required to start in order to open the steam admission valves for the HPCI turbine.
HPCI was declared inoperable at time 1754 [CDT] on 26 April 2016. Tech Spec LCO Conditions were entered and required actions completed. HPCI is a single train system. This report is submitted as a condition that at time of discovery could prevent the fulfillment of the safety function of an SSC [Structure, System, and Component] needed to mitigate the consequences of an accident. A similar condition was discovered on 25 April 2016 [see NRC Event #51882]. Corrective maintenance was performed and HPCI was declared operable following satisfactory completion of post work testing of the AOP. Initial investigation indicates that the fault which occurred on 26 April is not the same as that which occurred 25 April. Investigation is on going. The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Cooper  Nebraska (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| LER: | 05000298/LER-2016-002 |
| Time - Person (Reporting Time:+2.38 h0.0992 days <br />0.0142 weeks <br />0.00326 months <br />) | |
| Opened: | Aric Harris 01:17 Apr 27, 2016 |
| NRC Officer: | John Shoemaker |
| Last Updated: | Apr 27, 2016 |
| 51886 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
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