OVERVIEW

Using an activation calculation code FDKR and its associated data library AF-DCDLIB to calculate the radioactivity, decay heat, waste disposal rating and biological hazard potential from activation products, actinides and fission products in the FEB-E. The codes and libraries used in calculation are introduced briefly, and calculation results and decay curves of related hazards after the shutdown of one-year operation of the FEB-E are given. Results obtained show that the total radioactivity inventory, decay heat and BHP at shutdown are 5.74 10 ¹³MBq, 8.34MW and 4.08 10 ⁸km ³ of air for 316SS structure material, respectively.

Key words: Fusion breeder, Activation, Radioactivity

1 INTRODUCTION

A fusion breeder might be an essential intermediate application of fusion energy at earlier term, since it has the potential to provide plenty of commercial fissile fuel. Based on fusion physics and technologies available at present and in the near future, the realistic Fusion Experimental Breeder, FEB-E was designed. The objectives of the FEB-E are to demonstrate the engineering feasibility of fusion breeder with a capability of producing ~100kg ²³⁹Pu/year and to function as a test reactor for DEMO.

In fusion breeders, the flux and energy spectra of neutrons undergo a great change throughout the first wall and blanket. Therefore, to get correct spatial and temporal distributions of radioactive nuclides, a calculation method practical for a fission reactor cannot be directly applied in...