Event Notification Report for May 03, 2014
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
05/02/2014 - 05/03/2014
Non-Agreement State
Event Number: 50088
Rep Org: MANSON CONSTRUCTION
Licensee: MANSON CONSTRUCTION
Region: 4
City: ANCHORAGE State: AK
County:
License #: WN-I0448-1
Agreement: N
Docket:
NRC Notified By: ISAAC BRADLEY
HQ OPS Officer: PETE SNYDER
Licensee: MANSON CONSTRUCTION
Region: 4
City: ANCHORAGE State: AK
County:
License #: WN-I0448-1
Agreement: N
Docket:
NRC Notified By: ISAAC BRADLEY
HQ OPS Officer: PETE SNYDER
Notification Date: 05/06/2014
Notification Time: 11:47 [ET]
Event Date: 05/03/2014
Event Time: 12:00 [YDT]
Last Update Date: 05/06/2014
Notification Time: 11:47 [ET]
Event Date: 05/03/2014
Event Time: 12:00 [YDT]
Last Update Date: 05/06/2014
Emergency Class: NON EMERGENCY
10 CFR Section:
40.60(b)(2) - SAFETY EQUIPMENT FAILURE
10 CFR Section:
40.60(b)(2) - SAFETY EQUIPMENT FAILURE
Person (Organization):
JACK WHITTEN (R4DO)
FSME EVENTS RESOURCE (EMAI)
JACK WHITTEN (R4DO)
FSME EVENTS RESOURCE (EMAI)
PROCESS GAUGE SHUTTER FAILED TO FUNCTION PROPERLY
The licensee Radiation Safety Officer (RSO) determined that the shutter to a Berthold Model LB7440-D-CR process gauge with a 500 mCi Cs-137 source (source s/n: 031-08) did not open despite repeated attempts to cycle and lubricate the shutter opening mechanism. The RSO made this determination using instrumentation after rotating the shutter opening handle 180 degrees to the normally open position. The shutter had apparently become disconnected from the opening mechanism. The instrument is installed on a hopper dredge and is pointed down in an area not normally accessible by personnel.
A licensed Berthold technician has been contacted and will come to the site to repair the gauge.
The licensee Radiation Safety Officer (RSO) determined that the shutter to a Berthold Model LB7440-D-CR process gauge with a 500 mCi Cs-137 source (source s/n: 031-08) did not open despite repeated attempts to cycle and lubricate the shutter opening mechanism. The RSO made this determination using instrumentation after rotating the shutter opening handle 180 degrees to the normally open position. The shutter had apparently become disconnected from the opening mechanism. The instrument is installed on a hopper dredge and is pointed down in an area not normally accessible by personnel.
A licensed Berthold technician has been contacted and will come to the site to repair the gauge.
Power Reactor
Event Number: 50085
Facility: DRESDEN
Region: 3 State: IL
Unit: [] [2] []
RX Type: [1] GE-1,[2] GE-3,[3] GE-3
NRC Notified By: JOSHUA PICKETT
HQ OPS Officer: JEFF ROTTON
Region: 3 State: IL
Unit: [] [2] []
RX Type: [1] GE-1,[2] GE-3,[3] GE-3
NRC Notified By: JOSHUA PICKETT
HQ OPS Officer: JEFF ROTTON
Notification Date: 05/03/2014
Notification Time: 15:15 [ET]
Event Date: 05/03/2014
Event Time: 12:09 [CDT]
Last Update Date: 05/03/2014
Notification Time: 15:15 [ET]
Event Date: 05/03/2014
Event Time: 12:09 [CDT]
Last Update Date: 05/03/2014
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
Person (Organization):
ANN MARIE STONE (R3DO)
ANN MARIE STONE (R3DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | A/R | Y | 100 | Power Operation | 0 | Hot Shutdown |
AUTOMATIC REACTOR SCRAM DUE TO GENERATOR/TURBINE LOAD MISMATCH
"At 1209 CDT on 3 May 2014, Dresden Unit 2 automatically scrammed on a Generator-Turbine Load Mismatch signal following a main generator trip. All rods inserted to their full in positions.
"All systems operated as expected. Reactor vessel inventory and pressure are being maintained in automatic.
"The cause of the scram was due to a main generator trip that occurred during a voltage regulator channel transfer. Troubleshooting is in progress to determine the exact cause of the generator trip.
"This condition is being reported pursuant to 10CFR50.72(b)(2)(iv)(B), any event or condition that results in actuation of the reactor protection system (RPS) when the reactor is critical."
The plant is in a normal shutdown electrical lineup. Main feedwater is being used to maintain reactor vessel level and decay heat is being removed by the main condenser via the turbine bypass valves. There was no impact on Unit 3 which remains stable at 100 percent power.
The licensee notified the NRC Resident Inspector.
"At 1209 CDT on 3 May 2014, Dresden Unit 2 automatically scrammed on a Generator-Turbine Load Mismatch signal following a main generator trip. All rods inserted to their full in positions.
"All systems operated as expected. Reactor vessel inventory and pressure are being maintained in automatic.
"The cause of the scram was due to a main generator trip that occurred during a voltage regulator channel transfer. Troubleshooting is in progress to determine the exact cause of the generator trip.
"This condition is being reported pursuant to 10CFR50.72(b)(2)(iv)(B), any event or condition that results in actuation of the reactor protection system (RPS) when the reactor is critical."
The plant is in a normal shutdown electrical lineup. Main feedwater is being used to maintain reactor vessel level and decay heat is being removed by the main condenser via the turbine bypass valves. There was no impact on Unit 3 which remains stable at 100 percent power.
The licensee notified the NRC Resident Inspector.