CFR 10-70.50-2014 Energy. Part70:Domestic licensing of special nuclear material. Subpart G:Special Nuclear Material Control, Records, Reports and Inspections. Section70.50:Reporting requirements.
(a) Immediate report. Each licensee shall notify the NRC as soon as possible but not later than 4 hours after the discovery of an event that prevents immediate protective actions necessary to avoid exposures to radiation or radioactive materials that could exceed regulatory limits or releases of licensed material that could exceed regulatory limits (events may include fires, explosions, toxic gas releases, etc.).
CFR 10-70.50-2014 history
2003CFR 10-70.50-2014 Energy. Part70:Domestic licensing of special nuclear material. Subpart G:Special Nuclear Material Control, Records, Reports and Inspections. Section70.50:Reporting requirements.