Document: NRC Regulatory Guide
Document ID: b647b09e-9948-474b-8b4a-d2e08837ffa5
Document Type: regulatory_guide
Title: Guidance on Making Changes to Emergency Plans for Nuclear Power Reactors (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1505/ML15054A370.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.219
CFR Part: 
CFR Title: 

Content:
in ERFs where dose assessments are performed and PAR decisions are made; (b) a change in ERO staffing that would eliminate the onshift capability to make timely and accurate estimates of the actual or potential radiological hazards through liquid or gaseous release pathways; (c) the reassignment of dose assessment responsibilities from a site-specific EOF member to a common EOF manned with ERO personnel who are not sufficiently competent in the site’s radiation monitoring systems, ventilation systems, source terms, or potential release paths to perform a credible dose assessment; (d) the replacement of a site-specific dose assessment model with a generic model that offers results that have not been shown to be representative for the topography, meteorological regimes (e.g., valley effects or sea breeze), release pathways, or source terms applicable to that plant and its environs; (e) a change in field-monitoring air sampling media such that the requisite iodine sensitivity could not be met because of interference from the presence of noble gases; and DG-1324, Page 30 (f) changes to dose assessment software that would reduce the options available to assessment personnel to assess releases that have not yet started or that could occur through unmonitored release paths. d. The following examples would generally not require prior NRC approval: (1) A change that replaces existing field monitoring equipment with equipment of like quality, reliability, performance, and user interface would generally not require prior NRC approval (the licensee’s 10 CFR 50.54(q) evaluation must document the basis of this equivalency conclusion). (2) A change to dose assessment software that updates site parameter files to reflect a change in detector isotopic efficiencies would generally not require prior NRC approval provided that it results from an approved upgrade to the effluent radiation monitoring system. 4.10 10 CFR 50.47(b)(10)—Emergency Protective Actions a. The regulation at