I.-The justification for decisions to take action to prevent or reduce risks and protect people is examined when the plans referred to in Article L. 1333-13 and Chapter I of Title IV of Book VII of the Internal Security Code are drawn up and before the decisions referred to in Articles R. 1333-85 and R. 1333-86 are taken.
II – For the application of the optimisation principle provided for in 2° of Article L. 1333-2, a reference level of 100 mSv is set in terms of effective dose received for the duration of the radiological emergency, including all exposure routes.