次世代湿式再処理プロセスの核拡散抵抗性高度化のための保障措置システム

摘要

The fabrication of fast neutron reactor cycles is intended for next-generation nuclear energy systems. This is in line with the fact that the amount of plutonium, which should be reprocessed, increases significantly. Techniques for increasing the nuclear proliferation resistance, especially extrinsic measures including safeguards, are essential for such systems to be accepted by the international community. A highly resistant system with a high detection capability, as well as satisfying current safeguards requirements, was studied for an advanced aqueous reprocessing, and its technical practicability and operational compatibility were discussed. The effect of the proposed safeguards system in this paper was evaluated using the Markov model approach developed by the GIF Proliferation Resistance and Physical Protection Working Group (PR & PP WG). The proposed safeguards system includes a high-detection-capability system and the accountancy/verification measures based on the monthly interim inventory taking or verification that should be performed at a similar level of quality to the normal physical inventory verification with very little impact to the practical plant operation. This can only be realized with "safeguards by design."%ウラン資源の有効利用と将来に渡るエネルギーセキュリティの観点から，次世代原子力システムの検討が国際的に活発に行われており，第4世代原子力システム国際フォーラム（GIF）1）や革新的原子炉および燃料サイクルに関する国際プロジェクト（INPRO）2）の国際協力枠組でもこれらの検討が効率的に実施されている。開発目標には安全性，経済性等にならんで核拡散抵抗性の確保が掲げられ核不拡散が開発当初から重要視されている。