Event Notification Report for March 27, 2010
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
03/26/2010 - 03/27/2010
Power Reactor
Event Number: 45797
Facility: ARKANSAS NUCLEAR
Region: 4 State: AR
Unit: [1] [] []
RX Type: [1] B&W-L-LP,[2] CE
NRC Notified By: DAVID THOMPSON
HQ OPS Officer: PETE SNYDER
Region: 4 State: AR
Unit: [1] [] []
RX Type: [1] B&W-L-LP,[2] CE
NRC Notified By: DAVID THOMPSON
HQ OPS Officer: PETE SNYDER
Notification Date: 03/27/2010
Notification Time: 20:32 [ET]
Event Date: 03/27/2010
Event Time: 15:31 [CDT]
Last Update Date: 03/31/2010
Notification Time: 20:32 [ET]
Event Date: 03/27/2010
Event Time: 15:31 [CDT]
Last Update Date: 03/31/2010
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(ii)(A) - DEGRADED CONDITION
10 CFR Section:
50.72(b)(3)(ii)(A) - DEGRADED CONDITION
Person (Organization):
RICK DEESE (R4DO)
RICK DEESE (R4DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | N | 0 | Refueling | 0 | Refueling |
POTENTIALLY DEGRADED PRESSURIZER LEVEL TAP IDENTIFIED
"Arkansas Nuclear One Unit 1 is currently shut down in Mode 6 for refueling outage 1R22.
"On March 27, 2010 at 1531 CDT a visual examination of Unit 1 pressurizer level tap 1-RC-1001 A/B indicated evidence of past leakage from the nozzle bore. The leakage is indicated by a small trail of what appears to be dry boron on the lower portion of the nozzle bore accompanied by rust stains on the stainless steel nozzle."
The licensee notified the NRC Resident Inspector.
* * * UPDATE FROM DAVID THOMPSON TO DONALD NORWOOD AT 1558 EDT ON 3/31/2010 * * *
"Update per 10CFR50.72(c).
"During the visual examination of the bore of T1 pressurizer level tap nozzle RC-1001 after the inconel nozzle removal, it is evident that corrosion of the carbon steel base material is present. This nozzle location was identified as leaking during the bare metal visual examination."
The licensee notified the NRC Resident Inspector. Notified R4DO (O'Keefe).
"Arkansas Nuclear One Unit 1 is currently shut down in Mode 6 for refueling outage 1R22.
"On March 27, 2010 at 1531 CDT a visual examination of Unit 1 pressurizer level tap 1-RC-1001 A/B indicated evidence of past leakage from the nozzle bore. The leakage is indicated by a small trail of what appears to be dry boron on the lower portion of the nozzle bore accompanied by rust stains on the stainless steel nozzle."
The licensee notified the NRC Resident Inspector.
* * * UPDATE FROM DAVID THOMPSON TO DONALD NORWOOD AT 1558 EDT ON 3/31/2010 * * *
"Update per 10CFR50.72(c).
"During the visual examination of the bore of T1 pressurizer level tap nozzle RC-1001 after the inconel nozzle removal, it is evident that corrosion of the carbon steel base material is present. This nozzle location was identified as leaking during the bare metal visual examination."
The licensee notified the NRC Resident Inspector. Notified R4DO (O'Keefe).
General Information or Other
Event Number: 45801
Rep Org: NE DIV OF RADIOACTIVE MATERIALS
Licensee: OMAHA PUBLIC POWER DISTRICT
Region: 4
City: OMAHA State: NE
County:
License #: 01-39-04
Agreement: Y
Docket:
NRC Notified By: JIM DEFRAIN
HQ OPS Officer: DONALD NORWOOD
Licensee: OMAHA PUBLIC POWER DISTRICT
Region: 4
City: OMAHA State: NE
County:
License #: 01-39-04
Agreement: Y
Docket:
NRC Notified By: JIM DEFRAIN
HQ OPS Officer: DONALD NORWOOD
Notification Date: 03/29/2010
Notification Time: 16:06 [ET]
Event Date: 03/27/2010
Event Time: 09:50 [CDT]
Last Update Date: 03/29/2010
Notification Time: 16:06 [ET]
Event Date: 03/27/2010
Event Time: 09:50 [CDT]
Last Update Date: 03/29/2010
Emergency Class: NON EMERGENCY
10 CFR Section:
10 CFR Section:
Person (Organization):
GREG PICK (R4DO)
ANDREA KOCK (FSME)
GREG PICK (R4DO)
ANDREA KOCK (FSME)
AGREEMENT STATE REPORT - FIXED DENSITY GAUGE STUCK SHUTTER
The following information was received from the State of Nebraska via facsimile:
"The licensee uses fixed industrial gauges for measuring densities in fly ash hoppers at the stations precipitator building. The industrial gauges contain a Cesium-137 sealed source. The Cesium-137 sources were originally installed in 1975 and at the time contained 50 millicuries per source. The sources were manufactured and installed by Kay Ray, Inc. The gauges are Model No. 7700-50.
"The licensee was attempting to close the shutter on the fixed gauge prior to performing maintenance. One of the external closure cables was found to be slightly bound up and only partially closed the 'internal' source shutter. The cable closure was reopened, which reopened the source shutter up at the sealed source. Closure was tried again. This time the cable, which connects the handle at the floor to the sealed source shutter mechanism 20 feet above, bent instead of sliding the cable to the closed position. The 'event' happened at 9:50 am and was reported to the station's Shift Supervisor who in turn contacted the plant electricians to make repairs so the precipitator 'tag-out' could continue. By 11:00 am the [shutter] had been closed and the lab contacted to perform a survey to verify the source shutter was now in the closed position. No personnel were exposed to radiation during this event."
The following information was received from the State of Nebraska via facsimile:
"The licensee uses fixed industrial gauges for measuring densities in fly ash hoppers at the stations precipitator building. The industrial gauges contain a Cesium-137 sealed source. The Cesium-137 sources were originally installed in 1975 and at the time contained 50 millicuries per source. The sources were manufactured and installed by Kay Ray, Inc. The gauges are Model No. 7700-50.
"The licensee was attempting to close the shutter on the fixed gauge prior to performing maintenance. One of the external closure cables was found to be slightly bound up and only partially closed the 'internal' source shutter. The cable closure was reopened, which reopened the source shutter up at the sealed source. Closure was tried again. This time the cable, which connects the handle at the floor to the sealed source shutter mechanism 20 feet above, bent instead of sliding the cable to the closed position. The 'event' happened at 9:50 am and was reported to the station's Shift Supervisor who in turn contacted the plant electricians to make repairs so the precipitator 'tag-out' could continue. By 11:00 am the [shutter] had been closed and the lab contacted to perform a survey to verify the source shutter was now in the closed position. No personnel were exposed to radiation during this event."