[2F19-21] Intrinsic Safe Fast Reactor

[2F21] Study on intrinsic safe fast reactors to prevent re-criticality by convex core shape

(3)Study on neutron absorber materials for fuel with central axis absorber

*Yoshiaki TACHI¹, Naoyuki TAKAKI², Toshio WAKABAYASHI³, Makoto TAKAHASHI³ (1. Japan Atomic Energy Agency, 2. Tokyo City University, 3. Tohoku Univertsity)

Keywords:neutron absorber, Mixed oxide fuel, re-criticality, fast reactor

In order to prevent re-criticality of fast reactors in case of CDA, fuel with central axis absorber has been studying. The central absorber is hold in central axis of fuel pellet during normal operation of fast reactor, but the abserber will be dispersed into molten fuel in case of CDA.
Several physical properties of neutron absorber materials were investigated by literature, database and some experiments. Based on these investigation results, installation methods of B, Gd, Eu and Dy were studied.