The draft of event orientation emergency operation procedure(EOP) is based on the research of accident evolution which has been defined in advance.With the feedback of nuclear events and accidents,and better understanding of nuclear safety,events and accidents which are not considered will be added in EOP.The design and application of new procedure High Activity of Primary Loop(I RCP 10) is based on this kind feedback,and the requirement of the nuclear authority.The purpose of this procedure is to control the nuclear power plant reasonably and effectively in loss of integrity of the fuel elements,and to ensure that the radioactivity will not cause any damage to operators and later waste processing.