PNNL

Abstract

The goal of the Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) is to measure the neu- tron induced fission cross sections for 235,238U and 239Pu to an unprecedented accuracy of 0.5% or better. Cur- rently, the best known fission cross sections are for 235U and have uncertainties of 1 - 3%. For 239Pu, at some energies the uncertainty is as large as 20% [1]. These uncertainties in the cross section can propagate into fis- sion reactor performance parameter calculations such as: criticality, peak power, temperature reactivity, transmu- tation potential, radiotoxicity and decay heat in a respos- itory.