Semantic search
| Entered date | Site | Region | Reactor type | Event description | |
|---|---|---|---|---|---|
| ENS 46216 | 31 August 2010 12:59:00 | General Atomics | NRC Region 4 | The following information was obtained from the State of California via e-mail: Six sources of Am-241 were involved in a fire. Three of the sources were not damaged. The other three are believed to be encased in melted/solidified masses of metal that had encased the sources. Each source was approximately 24 nanocuries. Initial surveys did not identify radiological contamination. Further analysis of the solidified metal believed to contain the three sources is planned. The fire was initiated by the spontaneous combustion of charcoal fines used at the facility. There were no personnel injuries related to the fire event. Local media carried a story on the fire, but not the radiological component. The Am-241 sources are used as stabilizing sources in the air monitors. The sealed sources are not believed to have been breeched. The State and licensee will be performing follow-up investigations into the final disposition of the three sources encased in the solidified metal. California Report Number: 5010-081910. | |
| ENS 45296 | 25 August 2009 15:17:00 | General Atomics | NRC Region 4 | The defect is contained in the General Atomics Electronic Systems, Inc (GA-ESI) radiation monitoring system model RM-80 firmware. The RM-80 firmware anomaly was initially identified at the St. Lucie Nuclear Power Plant. The radiation monitor was part of the control room outside air intake ventilation radiation monitors. More specifically, if the radiation monitor is already in a high and or alert alarm state, and subsequently suffers a loss of power, then upon restoration of power to the unit, the RM-80 high and or alert alarm relays are not reenergized by the RM-80 firmware. This in turn prevents the relays that are located in the (RM)-80 from performing their safety related function. This error in the firmware only affects those plant sites that connect annunciator panels or other safety related equipment to the RM-80 Alert and High Alarm relays. Plant sites that use RM-80 radiation monitors will be advised to test their systems for this anomaly. When so requested, GA-ESI will provide all necessary information to plants on how to test their RM-80 radiation monitors, and how to receive firmware upgrades if the condition is found during testing. General Atomics will notify the following affected plants: Beaver Valley, Braidwood, Byron, Callaway, Indian Point 2 &3, Limerick, River Bend, Shearon Harris, South Texas, St. Lucie, Waterford, and Wolf Creek.
This notification is an update to a notification made on 1506 Hrs. EST on August 25, 2009 regarding the existence of a defect. This notification is being provided in compliance with the requirements of Title 10 Code of Federal Regulations Part 21.21. In the initial notification, under the section titled 'Locations affected by the reported condition,' General Atomics Electronic Systems, Inc. (GA-ESI) provided a table (Table1) that listed sites and corresponding firmware sets having safety related RM-80 software that had been found to contain the reported firmware anomaly. GA-ESI has now identified one additional firmware set that should be included in Table 1. The site is Braidwood and the firmware set is bhr165/01. Accordingly, Table 1 has been revised to include this firmware set for the Braidwood site. The revised Table 1 is attached to this update notification. Also, please note that earlier today, August 31, 2009, GA-ESI emailed a notification letter to its customer contact at the Braidwood site. All other information remains the same as was initially reported on August 25, 2009 Notified R3DO (Lipa). Also notified NRR and NRO via email. |