Document: 10 CFR Part 50
Document ID: 95bb6c95-4469-43d8-aa77-b4d3038159b8
Document Type: cfr
Title: Definitions.
Source: 10 CFR Part 50
Source URL: https://www.ecfr.gov/current/title-10/part-50/section-50.2
Revision Date: 
Chapter: 
Section ID: 50.2
CFR Part: 50
CFR Title: 10

Content:
The capability to prevent or mitigate the consequences of accidents which could result in potential offsite exposures comparable to the applicable guideline exposures set forth in § 50.34(a)(1) or § 100.11 of this chapter , as applicable. Small modular reactor means a power reactor, which may be of modular design as defined in § 52.1 of this chapter , licensed under § 50.21 or § 50.22 to produce heat energy up to 1,000 megawatts thermal per module. Source material means source material as defined in subsection 11z. of the Act and in the regulations contained in part 40 of this chapter . Source term refers to the magnitude and mix of the radionuclides released from the fuel, expressed as fractions of the fission product inventory in the fuel, as well as their physical and chemical form, and the timing of their release. Special nuclear material means ( 1 ) plutonium, uranium-233, uranium enriched in the isotope-233 or in the isotope-235, and any other material which the Commission, pursuant to the provisions of section 51 of the act, determines to be special nuclear material, but does not include source material; or ( 2 ) any material artificially enriched by any of the foregoing, but does not include source material. Station blackout means the complete loss of alternating current (ac) electric power to the essential and nonessential switchgear buses in a nuclear power plant ( i.e. , loss of offsite electric power system concurrent with turbine trip and unavailability of the onsite emergency ac power system). Station blackout does not include the loss of available ac power to buses fed by station batteries through inverters or by alternate ac sources as defined in this section, nor does it assume a concurrent single failure or design basis accident. At single unit sites, any emergency ac power source(s) in excess of the number required to meet minimum redundancy requirements ( i.e. , single failure) for safe shutdown (non-DBA) is assumed to be available and may