Investigation of cross section requirements for shielding of power reactors

In sensitivity studies for reactor shielding one starts from integral target quantities of interest like biological dose outside the shield, gamma heating in the pressure vessel and concrete shield or radiation damage in essential structural components outside the core. For these target quantities we determined the importance and contribution: 1. of different neutron and gamma sources in the reactor (source data); 2. of the total radiation interactions with single isotopes or natural elements (total cross section); 3. of partial interactions of primary interest (partial cross sections); 4. of the most effective energy groups and; 5. of the angular moments needed. Such studies had been done to show the requirements of cross section data for shielding of a PWR and fast reactor. (author)