Event Notification Report for May 10, 2009
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
05/09/2009 - 05/10/2009
Power Reactor
Event Number: 45052
Facility: HATCH
Region: 2 State: GA
Unit: [1] [] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: EDWEN URQUHART
HQ OPS Officer: MARK ABRAMOVITZ
Region: 2 State: GA
Unit: [1] [] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: EDWEN URQUHART
HQ OPS Officer: MARK ABRAMOVITZ
Notification Date: 05/10/2009
Notification Time: 12:52 [ET]
Event Date: 05/10/2009
Event Time: 10:41 [EDT]
Last Update Date: 05/10/2009
Notification Time: 12:52 [ET]
Event Date: 05/10/2009
Event Time: 10:41 [EDT]
Last Update Date: 05/10/2009
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Person (Organization):
EUGENE GUTHRIE (R2DO)
EUGENE GUTHRIE (R2DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | A/R | Y | 8 | Power Operation | 0 | Hot Shutdown |
INTERMEDIATE RANGE REACTOR SCRAM DURING TRANSITION TO RUN
"During Startup of HNP-1, after reaching greater than or equal to 7% RTP [rated thermal power], the crew placed the Reactor MODE switch to 'RUN,' in accordance with the Startup Procedure 34GO-OPS-001-1. Upon placing the MODE switch to 'RUN,' a full RPS actuation occurred due to upscale trip signals on the Intermediate Range Nuclear Instrumentation (IRM) 1C51K601A, 1C51K601D and 1C51K601H. Placing the Reactor MODE switch to 'RUN' bypasses the IRM inputs to the RPS system, so actuation of the RPS from the IRMS was not expected. All withdrawn control rods inserted properly upon receipt of the full SCRAM signal. All equipment functioned as expected, with the exception of the unexpected upscale trips of IRMs 1C51K601A, 1C51K601D and 1C51K601H and the subsequent RPS actuation from the IRMs.
"No reactivity changes were in progress at the time to cause the upscale trip signals. At this time, investigation is in progress, but the investigation and corrective action have not yet been completed.
"The shift crew is progressing to Cold Shutdown, MODE 4 at this time."
The decay heat is being removed by main turbine sealing steam with makeup provided via the control rod drive system. Offsite power is provided by the normal shutdown electrical lineup.
The licensee notified the NRC Resident Inspector.
"During Startup of HNP-1, after reaching greater than or equal to 7% RTP [rated thermal power], the crew placed the Reactor MODE switch to 'RUN,' in accordance with the Startup Procedure 34GO-OPS-001-1. Upon placing the MODE switch to 'RUN,' a full RPS actuation occurred due to upscale trip signals on the Intermediate Range Nuclear Instrumentation (IRM) 1C51K601A, 1C51K601D and 1C51K601H. Placing the Reactor MODE switch to 'RUN' bypasses the IRM inputs to the RPS system, so actuation of the RPS from the IRMS was not expected. All withdrawn control rods inserted properly upon receipt of the full SCRAM signal. All equipment functioned as expected, with the exception of the unexpected upscale trips of IRMs 1C51K601A, 1C51K601D and 1C51K601H and the subsequent RPS actuation from the IRMs.
"No reactivity changes were in progress at the time to cause the upscale trip signals. At this time, investigation is in progress, but the investigation and corrective action have not yet been completed.
"The shift crew is progressing to Cold Shutdown, MODE 4 at this time."
The decay heat is being removed by main turbine sealing steam with makeup provided via the control rod drive system. Offsite power is provided by the normal shutdown electrical lineup.
The licensee notified the NRC Resident Inspector.
General Information or Other
Event Number: 45189
Rep Org: NEXTERA ENERGY DUANE ARNOLD
Licensee: FLOWSERVE US, INC
Region: 3
City: CEDAR RAPIDS State: IA
County:
License #:
Agreement: Y
Docket:
NRC Notified By: BOB MURRELL
HQ OPS Officer: JOHN KNOKE
Licensee: FLOWSERVE US, INC
Region: 3
City: CEDAR RAPIDS State: IA
County:
License #:
Agreement: Y
Docket:
NRC Notified By: BOB MURRELL
HQ OPS Officer: JOHN KNOKE
Notification Date: 07/08/2009
Notification Time: 13:10 [ET]
Event Date: 05/10/2009
Event Time: 00:00 [CDT]
Last Update Date: 07/08/2009
Notification Time: 13:10 [ET]
Event Date: 05/10/2009
Event Time: 00:00 [CDT]
Last Update Date: 07/08/2009
Emergency Class: NON EMERGENCY
10 CFR Section:
21.21 - UNSPECIFIED PARAGRAPH
10 CFR Section:
21.21 - UNSPECIFIED PARAGRAPH
Person (Organization):
DAVE PASSEHL (R3DO)
PART 21 GROUP EMAIL
FRED BROWN EMAIL (NRR)
DAVE PASSEHL (R3DO)
PART 21 GROUP EMAIL
FRED BROWN EMAIL (NRR)
PART 21 - SAFETY RELATED CONTROL VALVE SPRING ACTUATOR SIZED INCORRECTLY
"NextEra Energy Duane Arnold (NextEra Energy) makes the following notification under 10 CFR 21.21(d)(3)(i) of a failure to comply found during surveillance testing. The specific issue is insufficient clearance between the spring and the inside of the cylinder of the actuator for a Miller series A63B2N air cylinder actuator for a control valve (CV-1956A, Control Building Chiller Discharge to Emergency Service Water Isolation). The resulting improper clearance caused an increase in running load, which caused the valve to become stuck in the closed position. The valve failure was discovered on May 10, 2009. The control valve actuator was supplied by Flowserve US, Inc, as a basic component in April, 2008 for use at the Duane Arnold Energy Center. Flowserve has indicated that the actuator was procured as a commercial grade item and dedicated for safety related installation under their QA program. The valve and actuator were installed on April 17, 2009.
"The lack of spring to actuator clearance resulted in a loss of capability of CV-1956A to perform its intended safety function of providing a safety related seismic discharge path for cooling water from the safety related Control Building Chiller, 1V-CH-1A. The Chiller was declared inoperable as a result of this failure to comply and, on July 1, 2009 was determined to have resulted in a substantial safety hazard.
"The actuator for CV-1956A was rebuilt with a replacement spring having proper dimensional clearance and higher opening force capability. The actuator has been installed by a plant modification and the control building chiller has been returned to an operable status.
"The air operated valve assembly supplier, Flowserve US Inc, was contacted on July 1, 2009 to discuss NextEra Energy's findings.
"NextEra Energy has verified that no other safety related actuators with the incorrect valve actuator cylinder to spring clearances have been installed at the Duane Arnold Energy Center."
The NRC Resident Inspector has been notified.
"NextEra Energy Duane Arnold (NextEra Energy) makes the following notification under 10 CFR 21.21(d)(3)(i) of a failure to comply found during surveillance testing. The specific issue is insufficient clearance between the spring and the inside of the cylinder of the actuator for a Miller series A63B2N air cylinder actuator for a control valve (CV-1956A, Control Building Chiller Discharge to Emergency Service Water Isolation). The resulting improper clearance caused an increase in running load, which caused the valve to become stuck in the closed position. The valve failure was discovered on May 10, 2009. The control valve actuator was supplied by Flowserve US, Inc, as a basic component in April, 2008 for use at the Duane Arnold Energy Center. Flowserve has indicated that the actuator was procured as a commercial grade item and dedicated for safety related installation under their QA program. The valve and actuator were installed on April 17, 2009.
"The lack of spring to actuator clearance resulted in a loss of capability of CV-1956A to perform its intended safety function of providing a safety related seismic discharge path for cooling water from the safety related Control Building Chiller, 1V-CH-1A. The Chiller was declared inoperable as a result of this failure to comply and, on July 1, 2009 was determined to have resulted in a substantial safety hazard.
"The actuator for CV-1956A was rebuilt with a replacement spring having proper dimensional clearance and higher opening force capability. The actuator has been installed by a plant modification and the control building chiller has been returned to an operable status.
"The air operated valve assembly supplier, Flowserve US Inc, was contacted on July 1, 2009 to discuss NextEra Energy's findings.
"NextEra Energy has verified that no other safety related actuators with the incorrect valve actuator cylinder to spring clearances have been installed at the Duane Arnold Energy Center."
The NRC Resident Inspector has been notified.