Event Notification Report for December 11, 2011
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
12/10/2011 - 12/11/2011
EVENT NUMBERS
47517
Power Reactor
Event Number: 47517
Facility: SALEM
Region: 1 State: NJ
Unit: [1] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: THOMAS BYYKKONEN
HQ OPS Officer: JOHN KNOKE
Region: 1 State: NJ
Unit: [1] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: THOMAS BYYKKONEN
HQ OPS Officer: JOHN KNOKE
Notification Date: 12/11/2011
Notification Time: 16:45 [ET]
Event Date: 12/11/2011
Event Time: 12:58 [EST]
Last Update Date: 12/11/2011
Notification Time: 16:45 [ET]
Event Date: 12/11/2011
Event Time: 12:58 [EST]
Last Update Date: 12/11/2011
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):
CHRISTOPHER CAHILL (R1DO)
CHRISTOPHER CAHILL (R1DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
INTERMEDIATE RANGE NUCLEAR INSTRUMENT HIGH FLUX TRIP SET POINTS SET INCORRECTLY
"This 8 hour notification is being made in accordance with 10 CFR50.72 (b)(3)(v)(A).
"On November 24, 2011, 1N35 and 1N36 Intermediate Range Nuclear Instruments High Flux Trip set points were adjusted while Unit 1 was at approximately 55% reactor power following the 1R21 Refueling outage, On December 11, 2011, at 1258 EST Salem Unit 1 entered Technical Specification 3.0.3, after determining the set points were set incorrectly.
"A review of the Reactor Engineering Manual, which contains the trip set points, showed that the trip set points for 1N35 and 1N36 were 2.69E-4 and 2.37E-4 respectively. These values equate to approximately 125% thermal power. The Intermediate Range Trip set point is normally set to 25% thermal power. Both channels were declared inoperable and preparations were made to install the correct set points. At 1628 [EST] 1N35 was declared operable and Technical Specification 3.0.3 was exited following installation of the correct set point and retest of the channel.
"There was no out-of-service safety related equipment that contributed to this event. No one was injured as a result of this event."
The licensee will notify the NRC Resident Inspector and local authorities.
"This 8 hour notification is being made in accordance with 10 CFR50.72 (b)(3)(v)(A).
"On November 24, 2011, 1N35 and 1N36 Intermediate Range Nuclear Instruments High Flux Trip set points were adjusted while Unit 1 was at approximately 55% reactor power following the 1R21 Refueling outage, On December 11, 2011, at 1258 EST Salem Unit 1 entered Technical Specification 3.0.3, after determining the set points were set incorrectly.
"A review of the Reactor Engineering Manual, which contains the trip set points, showed that the trip set points for 1N35 and 1N36 were 2.69E-4 and 2.37E-4 respectively. These values equate to approximately 125% thermal power. The Intermediate Range Trip set point is normally set to 25% thermal power. Both channels were declared inoperable and preparations were made to install the correct set points. At 1628 [EST] 1N35 was declared operable and Technical Specification 3.0.3 was exited following installation of the correct set point and retest of the channel.
"There was no out-of-service safety related equipment that contributed to this event. No one was injured as a result of this event."
The licensee will notify the NRC Resident Inspector and local authorities.