Document: 10 CFR Part 50
Document ID: 07c52eb1-b952-4f98-bfad-2525695d6ad5
Document Type: cfr
Title: Licensee event report system.
Source: 10 CFR Part 50
Source URL: https://www.ecfr.gov/current/title-10/part-50/section-50.73
Revision Date: 
Chapter: 
Section ID: 50.73
CFR Part: 50
CFR Title: 10

Content:
oactive material; or ( D ) Mitigate the consequences of an accident. ( viii ) ( A ) Any airborne radioactive release that, when averaged over a time period of 1 hour, resulted in airborne radionuclide concentrations in an unrestricted area that exceeded 20 times the applicable concentration limits specified in appendix B to part 20, table 2, column 1. ( B ) Any liquid effluent release that, when averaged over a time period of 1 hour, exceeds 20 times the applicable concentrations specified in appendix B to part 20, table 2, column 2, at the point of entry into the receiving waters ( i.e., unrestricted area) for all radionuclides except tritium and dissolved noble gases. ( ix ) ( A ) Any event or condition that as a result of a single cause could have prevented the fulfillment of a safety function for two or more trains or channels in different systems that are needed to: ( 1 ) Shut down the reactor and maintain it in a safe shutdown condition; ( 2 ) Remove residual heat; ( 3 ) Control the release of radioactive material; or ( 4 ) Mitigate the consequences of an accident. ( B ) Events covered in paragraph (a)(2)(ix)(A) of this section may include cases of procedural error, equipment failure, and/or discovery of a design, analysis, fabrication, construction, and/or procedural inadequacy. However, licensees are not required to report an event pursuant to paragraph (a)(2)(ix)(A) of this section if the event results from: ( 1 ) A shared dependency among trains or channels that is a natural or expected consequence of the approved plant design; or ( 2 ) Normal and expected wear or degradation. ( x ) Any event that posed an actual threat to the safety of the nuclear power plant or significantly hampered site personnel in the performance of duties necessary for the safe operation of the nuclear power plant including fires, toxic gas releases, or radioactive releases. ( b ) Contents. The Licensee Event Report shall contain: ( 1 ) A brief abstract describing the major