Abstract: Several methods, including the NUREG-0396 recommended method, probability criterion method and risk-informed method, used in redefinition emergency planning zone (EPZ) of small reactors, and their possible applicability are discussed. The risk-informed method is recommended to define the EPZ of small reactors. Issues including interaction between EPZ and nuclear power plant design, reasonable accident hypothesis, and public psychological factors applied in defining EPZ are discussed and recommendations are given.

Key words: small reactor, emergency planning zone, redefinition methodology, risk-informed