Document: NRC Regulatory Guide
Document ID: 96baa826-d3bb-478b-8f38-e74500f6d433
Document Type: regulatory_guide
Title: 06/2009 (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0911/ML091170109.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.21
CFR Part: 
CFR Title: 

Content:
at material (or a portion of that material) is instead discharged to the environment. unplanned release—The unintended or unexpected release of liquid or airborne radioactive material to the on-site environment. An example of an unplanned release would include a plant occurrence that results in a leak or spill of radioactive material to on-site areas requiring a report under 10 CFR 50.72 or 10 CFR 50.73. (See NUREG/CR-5569, “Health Physics Positions Data Base,” February, 1994, HPPOS-254, “Definition of Unplanned Release,” (Ref. 53).) For example, if a licensee has prepared documents describing an intended release (e.g., a preliminary radioactive waste release permit) in advance of the evolution, and the intended release occurs as planned, then the release is a planned release. If such documents (e.g., a preliminary release permit) are not prepared (or considered/evaluated) before the release, it is potentially an unplanned release (and additional information may be required to determine if it is an unplanned release). unrestricted area—Unrestricted area means an area, access to which is neither limited nor controlled by the licensee. Rev. 2 of RG 1.21, Page 49 uranium fuel cycle—The operations of milling of uranium ore, chemical conversion of uranium, isotopic enrichment of uranium, fabrication of uranium fuel, generation of electricity by a light-water- cooled nuclear power plant using uranium fuel, and reprocessing of spent uranium fuel, to the extent that these directly support the production of electrical power for public use utilizing nuclear energy, but excludes mining operations, operations at waste disposal sites, transportation of any radioactive material in support of these operations, and the reuse of recovered non-uranium special nuclear and byproduct materials from the cycle. χ/Q—Referred to as “Xi over Q,” χ/Q is the average atmospheric effluent concentration, χ, normalized by release rate, Q, at a distance (or location) in a