The Nuclear Regulatory Commission (NRC) is revising its emergency planning regulations. This amendment allows greater flexibility in the licensee's emergency preparedness training activities in the 2-year period between biennial full-participation exercises. The amendment preserves the requirement that each licensee, at each site, conduct an emergency preparedness exercise biennially, with full participation by State and local governments that are within the plume exposure pathway emergency planning zone (EPZ); reduces the required frequency of exercising the licensee's onsite emergency plan from annual to biennial; requires licensees to ensure that adequate emergency response capabilities are maintained between biennial exercises by conducting drills, at least one of which must involve some of the principal functional areas of the licensee's onsite emergency response capabilities; and requires licensees to continue enabling State and local governments that are in the plume exposure pathway emergency planning zones (EPZs) to participate in drills. With this amendment, the Commission is granting, in part, a petition for rulemaking submitted by the Virginia Electric Power Company on December 9, 1992 (PRM-50-58).