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:
sure injection function of the residual heat removal system. ( 5 ) BWR reactor core isolation cooling system; isolation condenser system; and feedwater coolant injection system. ( 6 ) PWR auxiliary or emergency feedwater system. ( 7 ) Containment heat removal and depressurization systems, including containment spray and fan cooler systems. ( 8 ) Emergency ac electrical power systems, including: emergency diesel generators (EDGs); hydroelectric facilities used in lieu of EDGs at the Oconee Station; and BWR dedicated Division 3 EDGs. ( 9 ) Emergency service water systems that do not normally run and that serve as ultimate heat sinks. ( v ) Any event or condition that could have prevented the fulfillment of the safety function of structures or systems that are needed to: ( A ) Shut down the reactor and maintain it in a safe shutdown condition; ( B ) Remove residual heat; ( C ) Control the release of radioactive material; or ( D ) Mitigate the consequences of an accident. ( vi ) Events covered in paragraph (a)(2)(v) of this section may include one or more procedural errors, equipment failures, and/or discovery of design, analysis, fabrication, construction, and/or procedural inadequacies. However, individual component failures need not be reported pursuant to paragraph (a)(2)(v) of this section if redundant equipment in the same system was operable and available to perform the required safety function. ( vii ) Any event where a single cause or condition caused at least one independent train or channel to become inoperable in multiple systems or two independent trains or channels to become inoperable in a single system designed to: ( A ) Shut down the reactor and maintain it in a safe shutdown condition; ( B ) Remove residual heat; ( C ) Control the release of radioactive 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