ENS 53022
ENS Event | |
|---|---|
07:09 Oct 18, 2017 | |
| Title | Hpci Declared Inoperable |
| Event Description | Eight hour report due to HPCl [High Pressure Coolant Injection] inoperability.
HPCl valve operability testing was performed on October 18, 2017. Following satisfactory completion of opening stroke timing, the control switch for HPCI-MOV-MO19, HPCI Injection Valve, was taken to close. The valve indicates that it moved to an intermediate position, but it has not indicated that it has fully closed. This resulted in the valve being declared inoperable. This valve is normally closed and automatically opens on a HPCI initiation signal. HPCl was previously declared inoperable at time 0136 [CDT] on October 18 for surveillance testing. Entry was made into Tech Spec LCO 3.5.1 Condition C - HPCI System Inoperable at that time. Required Actions for Condition C are to verify by administrative means RCIC System is operable within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and restore HPCI System to operable status within 14 days. RClC was verified operable by administrative means concurrent with declaration of HPCI inoperable. Troubleshooting activities for HPCI are being planned. HPCI is a single train safety system. This report is submitted as a condition that at time of discovery could prevent the fulfillment of the safety function of an SSC [structures, systems, and components] needed to mitigate the consequences of an accident. This condition has been entered into the CNS Corrective Action Program. The licensee notified the NRC Resident Inspector.
CNS is retracting the 8-hour non-emergency notification made on October 18, 2017 at 0209 CDT (EN 53022). Subsequent evaluation concluded HPCI-MOV-MO19 was still capable of performing its safety function with the failed torque switch identified during troubleshooting and would have supported the operability of the HPCI system. HPCI-MOV-MO19 only has a safety function to open to support HPCI safety function. The failed torque switch only affects the close function of the valve; therefore the HPCI system remained fully capable of performing its required safety function and was operable with the identified condition. The NRC Resident Inspector has been notified. Notified R4DO (Haire). |
| 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 | |
| Time - Person (Reporting Time:+-1.7 h-0.0708 days <br />-0.0101 weeks <br />-0.00233 months <br />) | |
| Opened: | Aric Harris 05:27 Oct 18, 2017 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Nov 14, 2017 |
| 53022 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |