ENS 56372 | 18 February 2023 20:09:00 | American Centrifuge Plant | NRC Region 2 | The following is a synopsis of information provided by the licensee:
At 1522 EST on February 18, 2023, the Portsmouth Gaseous Diffusion Plant declared a Site Area Emergency after transport equipment contacted a uranium hexafluoride (UF6) cylinder in storage. The contact cracked a weld on a stiffening ring on the cylinder. Initial reports indicated there was a small amount of UF6 released. The release was minimal and contained on the facility. Staff were directed to shelter in place. No off-site release occurred, and no off-site protective actions were recommended.
The licensee notified state and local authorities. No media press release is planned.
At 1757 EST on February 18, 2023, the Site Area Emergency was terminated after the leak was sealed.
Notified DHS SWO, FEMA Ops Center, USDA Ops Center, HHS Ops Center, DOE Ops Center, CISA Central Watch Officer, EPA EOC |
ENS 42348 | 20 February 2006 06:23:00 | LaSalle | NRC Region 3 | While shutting down Unit 1 IAW LGP-2-1 with the main turbine off line the plant experienced a turbine control system (EHC) malfunction. This resulted in opening all main turbine bypass valves and subsequent reactor low pressure condition. The low pressure condition resulted in a closure of all main steam isolation valves (MSIV's) and automatic reactor scram. Three rods failed to indicate fully inserted on the scram. Plant emergency operating procedures were entered. All ECCS and plant systems operated as expected. All control rods are fully inserted and the ATWS emergency operating procedure has been exited.
The main turbine had been taken off line prior to this event and shutdown was being conducted with heat removal on the bypass valves. Pressure control is currently by using the steam line drains with the Safety Relief Valves in manual. Level is being maintained using normal feedwater. The electrical grid is stable though the plant is not yet on backfeed. Diesel generators are operable.
The licensee will notify the NRC Resident Inspector.
The NRC entered Monitoring Mode at 0243.
Notified R4DO (Graves), DHS (SWO), FEMA (J Kanupp), DOE (S. Morrone), EPA(NRC) (Nowak), USDA (Amanda), HHS (Kleiman).
- * * UPDATE AT 0402 ON 2/20/2006 * * *
In addition to the initial notification, La Salle is reporting a group 1 isolation in accordance with 10CFR50.72(b)(3)(iv)(a).
- * * UPDATE AT 0435 ON 2/20/2006 * * *
The site exited the Site Area Emergency and entered the recovery phase.
- * * UPDATE AT 05:59 ON 2/20/2006 * * *
At the time of the scram @ 0023 hours rod 38-43 showed position 24 and rods 26-15 and 34-47 showed unknown. Based on more than one rod out condition, it is unanalyzed until shutdown margin can be verified.
- * * UPDATE AT 0655 ON 2/20/2006 * * *
NRC exited Monitoring Mode.
Notified IRD (Wilson), NRR EO (J. Lyons), R3DO (Lara), R4DO (Graves), NRR (Dyer), DHS (SWO), FEMA (Eerwin), DOE (Joe Stambaugh), NRC (does not take updates), USDA (Jim Brzostek), HHS (SOC) (Lt Hrynyshen).
- * * UPDATE FROM DAN COVEYOU TO JOE O'HARA AT 0700 ON 02/22/06 * * *
Post trip evaluations have confirmed that all control rods were fully inserted within four minutes of the reactor scram. A review of the post-trip data suggests that there were only control rod indication problems on the three subject rods and all control rods were fully inserted immediately at the time of the reactor scram. Follow-up evaluations also demonstrated that even if the three subject control rods remained fully withdrawn in a cold shutdown condition, the reactor would have remained adequately shutdown. Additional confirmatory evaluations are continuing.
The licensee issued a press release on this event. The licensee notified the NRC Resident Inspector.
R3DO(Hills) has been notified. |
ENS 40405 | 22 December 2003 09:00:00 | Honeywell International, Inc. | NRC Region 2 | At 0245 CST, a small release of UF6 occurred lasting approximately 45 minutes. At 0300 CST the licensee declared a Site Area Emergency. The release has been terminated at the time of the notification. All personnel were evacuated within a 1 mile radius. At the time of notification, the evacuated personnel were allowed to return to their homes. The local sheriff has responded to the scene. NRC HQ and Region 2 NRC personnel are responding and a NRC Inspector is in transit to the site. The NRC entered Monitoring phase of Normal Mode at 0515 EST. The Acting NRC Chairman (Commissioner Merrifield) has been informed. There is no indication at this time of any malevolent activity.
Initial reports indicated that there were no injuries at the plant, but three individuals offsite were taken to the hospital. Two have been released, and the third is being evaluated further prior to release. About 25 people offsite were temporarily evacuated and some 75 persons remained sheltered for a time in their homes. The licensee is evaluating the amount of material released.
Licensee notified State of Illinois. NRC Headquarters also notified DHS-DOE (Mike Wyatt)
The licensee terminated the Site Area Emergency at 0650 CST on 12/22/03. The release is over, the plant is stable and the licensee is in the recovery mode. The NRC exited the Monitoring Phase of the Normal Mode for this event at 1230 ET.
Notified DIRO (S. Frant), NMSS EO (F. Brown), R2DO (T. Decker), USDA (L. Jensen), HHS (J. Little), EPA (Rawls), DHS (Frost), FEMA (D. Barden) regarding exiting Monitoring Phase of the Normal Mode. |