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:
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 be designated as an alternate power source(s) provided the applicable requirements are met. At multi-unit sites, where the combination of emergency ac power sources exceeds the minimum redundancy requirements for safe shutdown (non-DBA) of all units, the remaining emergency ac power sources may be used as alternate ac power sources provided they meet the applicable requirements. If these criteria are not met, station blackout must be assumed on all the units. Substantial safety hazard means, for the purposes of § 50.55(e) of this chapter , a loss of safety function to the extent that there is a major reduction in the degree of protection provided to public health and safety for any facility or activity authorized by the construction permit issued under this part. Testing facility means a non-power production or utilization facility that is a nuclear reactor licensed under § 50.21(c) or § 50.22 for which: ( 1 ) Analyzed accident radiation doses are in excess of the dose criterion for facilities not subject to 10 CFR part 100 set forth in § 50.34(a)(1)(i) ; or ( 2 ) The Commission determines that the design, operation, or use and the associated risk warrant classification as a testing facility. Total Effective Dose Equivalent (TEDE) means the sum of the effective dose equivalent (for external exposures) and the committed effective dose equivalent (for internal exposures). Unique purpose means a project, program, or commercial activity which cannot reasonably be accomplished without the use of HEU fuel, and may include: ( 1 ) A specific experiment, program, or commercial activity (typically long-term) that significantly serves the U.S. national interest and cannot be accomplished without the use of HEU fuel; ( 2 ) Reactor physics or reactor development based