ENS 45375: Difference between revisions
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| event date = 09/21/2009 14:46 EDT | | event date = 09/21/2009 14:46 EDT | ||
| last update date = 09/21/2009 | | last update date = 09/21/2009 | ||
| title = Reactor Protection System | | title = Reactor Protection System and Primary Containment Isolation System Actuation After Placing Hpci System Inservice | ||
| event text = On September 21, 2009, at 14:46 EDT, Unit 1 received valid actuations of the Reactor Protection System (RPS) and the Primary Containment Isolation System. Unit 1 was non-critical, operating in Mode 3, when a RPS actuation occurred. Operators were placing the High Pressure Coolant Injection (HPCI) system in service for reactor pressure control, when a resulting water level shrink caused level in the Reactor Pressure Vessel to drop to Low Level 1 causing the actuation of RPS and the Primary Containment Isolation system. The HPCI system was secured, and level stabilized in the normal band. | | event text = On September 21, 2009, at 14:46 EDT, Unit 1 received valid actuations of the Reactor Protection System (RPS) and the Primary Containment Isolation System. Unit 1 was non-critical, operating in Mode 3, when a RPS actuation occurred. Operators were placing the High Pressure Coolant Injection (HPCI) system in service for reactor pressure control, when a resulting water level shrink caused level in the Reactor Pressure Vessel to drop to Low Level 1 causing the actuation of RPS and the Primary Containment Isolation system. The HPCI system was secured, and level stabilized in the normal band. | ||
Primary Containment Isolation system Group 2 (i.e., Drywell Equipment and Floor Drain, Residual Heat Removal (RHR) Discharge to Radwaste, and RHR Process Sample), Group 6 (i.e., Containment Atmosphere Control/Dilution, Containment Atmosphere Monitoring, and Post Accident Sampling Systems), and Group 8 (i.e., RHR Shutdown Cooling) isolation signals were received. RHR was not in shutdown cooling at the time of the isolation signal. Actuations of the Primary Containment Isolation Valves (PCIVs) were completed and the affected equipment responded as designed, with the following exceptions: Two Group 2 valves (1-G16-F003 and 1-G16-F019) and two Group 6 valves (1-CAC-V6 and l-CAC-V9) did not automatically isolate and were manually isolated from the control panel. Investigation is under way to determine why these valves did not automatically close. | Primary Containment Isolation system Group 2 (i.e., Drywell Equipment and Floor Drain, Residual Heat Removal (RHR) Discharge to Radwaste, and RHR Process Sample), Group 6 (i.e., Containment Atmosphere Control/Dilution, Containment Atmosphere Monitoring, and Post Accident Sampling Systems), and Group 8 (i.e., RHR Shutdown Cooling) isolation signals were received. RHR was not in shutdown cooling at the time of the isolation signal. Actuations of the Primary Containment Isolation Valves (PCIVs) were completed and the affected equipment responded as designed, with the following exceptions: Two Group 2 valves (1-G16-F003 and 1-G16-F019) and two Group 6 valves (1-CAC-V6 and l-CAC-V9) did not automatically isolate and were manually isolated from the control panel. Investigation is under way to determine why these valves did not automatically close. | ||
Latest revision as of 22:11, 1 March 2018
| Where | |
|---|---|
Brunswick  North Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+0.27 h0.0113 days <br />0.00161 weeks <br />3.69846e-4 months <br />) | |
| Opened: | John Miller 19:02 Sep 21, 2009 |
| NRC Officer: | Dong Park |
| Last Updated: | Sep 21, 2009 |
| 45375 - NRC Website
| |