TY - BOOK AU - Zwemann,W. AU - Langenbuch,S. AU - Giese,H. AU - Kiefhaber,E. ED - Kernforschungszentrum Karlsruhe TI - An improvedd method for calculating control rod reactivity worths in fast sodium cooled reactor cores PY - 1993/// CY - Karlsruhe PB - KfK ER -