ENS Event | |
|---|---|
08:57 Jan 24, 2016 | |
| Title | Average Power Range Monitoring System Inoperable |
| Event Description | At 0357 hours0.00413 days <br />0.0992 hours <br />5.902778e-4 weeks <br />1.358385e-4 months <br /> [EST] on January 24, 2016, during a shut down required by plant Technical Specifications (see EN#51679), the 3A Feedwater heater isolated while performing a Reactor Recirculation Pump downshift. A consequence of this Feedwater heater isolation was that all 8 of the Average Power Range Monitors (APRM) became inoperable due to a calibration set point being out of tolerance. The APRM's are relied upon for the reactors high neutron flux trips. The inoperable APRM's resulted in a loss of RPS Trip Capability and a loss of safety function. The manual reactor trip function and other RPS functions remained available. RPS Trip capability for the APRM's was restored at 0445 hours0.00515 days <br />0.124 hours <br />7.357804e-4 weeks <br />1.693225e-4 months <br /> on January 24, 2016. This notification is being made under [10 CFR] 50.72(b)(3)(v)(A) for an event or condition that could have prevented the fulfillment of a safety function affecting the ability to shut down the reactor.
The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Perry  Ohio (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor | |
| LER: | 05000440/LER-2016-001 Regarding Drywell Leakage Level 8 Automatic Scram and APRM Loss of Safety Function |
| Time - Person (Reporting Time:+2.43 h0.101 days <br />0.0145 weeks <br />0.00333 months <br />) | |
| Opened: | Mike Doty 11:23 Jan 24, 2016 |
| NRC Officer: | Daniel Mills |
| Last Updated: | Jan 24, 2016 |
| 51681 - NRC Website
Loading map... | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | A/R |
| Before | Power Operation (52 %) |
| After | Power Operation (52 %) |