Event Notification Report for January 24, 2016
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
01/23/2016 - 01/24/2016
EVENT NUMBERS
51681
51681
Power Reactor
Event Number: 51681
Facility: PERRY
Region: 3 State: OH
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: MIKE DOTY
HQ OPS Officer: DANIEL MILLS
Region: 3 State: OH
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: MIKE DOTY
HQ OPS Officer: DANIEL MILLS
Notification Date: 01/24/2016
Notification Time: 11:23 [ET]
Event Date: 01/24/2016
Event Time: 03:57 [EST]
Last Update Date: 01/24/2016
Notification Time: 11:23 [ET]
Event Date: 01/24/2016
Event Time: 03:57 [EST]
Last Update Date: 01/24/2016
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(A) - POT UNABLE TO SAFE SD
10 CFR Section:
50.72(b)(3)(v)(A) - POT UNABLE TO SAFE SD
Person (Organization):
JAMNES CAMERON (R3DO)
SCOTT MORRIS (NRR)
WILLIAM GOTT (IRD)
JAMNES CAMERON (R3DO)
SCOTT MORRIS (NRR)
WILLIAM GOTT (IRD)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | A/R | Y | 52 | Power Operation | 52 | Power Operation |
AVERAGE POWER RANGE MONITORING SYSTEM INOPERABLE
"At 0357 hours [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 hours 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.
"At 0357 hours [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 hours 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.