GENERATION AND VALIDATION OF ORIGEN-S LIBRARIES FOR DEPLETION AND TRANSMUTATION CALCULATIONS BASED ON JEF2.2 AND EAF3 BASIC DATA

The data libraries for light elements, actinides and fission products of the ORIGEN-S code for depletion and transmutation calculations in t he SCALE4.1 computer code system have been updated with respect to cro ss-section data, radioactive-decay data and fission-product yield data using JEF2.2 as the basic data source and EAF3 as an additional sourc e. This required the fission-product library to be extended with 201 n ew fission-product nuclides or isomeric states. The effect of the upda te of different quantities involved is evaluated with a burn-up benchm ark. When ORIGEN-S is used as a stand-alone code, i.e. without regular update of cross-sections of the major nuclides due to changes in the neutron spectrum during burn-up, the results show appreciable differen ces in actinide and fission-product densities due to the cross-section update. The effects of updates of decay data and fission-product yiel ds are generally small, but with noticeable exceptions. The update of fission and capture reaction energies gives a small but systematic cha nge in actinide and fission-product concentration. The new ORIGEN-S li braries have also been converted for use with the SCALE4.2 package. (C ) 1997 Elsevier Science S.A.