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Start date | Reporting criterion | Title | Event description | System | LER | |
---|---|---|---|---|---|---|
ENS 53527 | 26 July 2018 07:00:00 | Part 70 App A (B)(2) | Disabled Ventilation System | On 7/26/18 at approximately 1355 PDT, the Building 103 laboratory facility ventilation exhaust system was disabled during a scheduled evacuation drill at the Vallecitos Nuclear Center (VNC). The system was restored on 7/26/18 at approximately 1407 PDT. There were no active fissile material operations in Building 103, thus no unsafe condition existed, and no release of material occurred. This event is being reported pursuant to the requirements of 10 CFR 70.50 (b)(2). The licensee will notify the NRC Region 4 office.
EN53527, made July 27, 2018, reported an event in accordance with 10CFR70.50(b)(2) in which the Vallecitos Nuclear Center Building 103 facility ventilation exhaust system was disabled for approximately 12 minutes. At the time of the report, information regarding the special nuclear material (SNM) in the affected Building 103 areas was not available and a conservative decision was made that the ventilation system was required to prevent releases or exposures to radioactive materials exceeding regulatory limits or to mitigate the consequences of an accident. Based on a subsequent review of SNM inventory records and additional survey measurements, it has been determined the event report should be retracted due to the minimal amount of SNM that could have been affected. Notified R4 Fuel Cycle Decommissioning Branch and NMSS Enrichment and Conversion Branch. Notified R4DO (Vasquez) and NMSS Events Notification (email). | ||
ENS 43591 | 23 August 2007 23:50:00 | Other Unspec Reqmnt | Unusual Event Declared Due to Severe Weather in the Area | Per the site emergency plan, MOI's 202 and 233, at 1850 local time, the licensee declared an Unusual Event due to severe weather including tornado warnings. The licensee sheltered personnel onsite. No damage was sustained at the site. There was no radiological release. No offsite assistance was requested. At 1930 local time the licensee terminated the Unusual Event due to expiration of the tornado warnings. The licensee notified state authorities. |