核燃料サイクル施設における内部脅威リスクの評価

Assessment of risk of insider threats in nuclear fuel cycle facilities

清水 亮 ; 須田 一則 ; 玉井 広史 ; 田崎 真樹子 ; 小鍛治 理紗

Shimizu, Ryo; Suda, Kazunori; Tamai, Hiroshi; Tazaki, Makiko; Kokaji, Lisa

核燃料サイクル施設の核セキュリティリスクに対しては、従来、外部脅威を想定し、施設内への侵入防止と早期検知を目的とした対策が行われてきた。一方、国際的なテロの発生等から内部脅威への対応が課題として取り上げられ、個人の信頼性確認制度等の内部脅威対策の実施が検討されているところである。ただし、内部脅威者による核燃料サイクル施設へ及ぼす脅威の程度について、これまで公開された例が少ない。そこで、核燃料サイクルの工程毎に、取り扱う核物質の種類や、工程、作業方法から、想定される内部脅威とその影響について概念的検討を行った。

As to nuclear security measures against external threats to nuclear fuel cycle facilities, not only preventive measures against intrusion into such facilities, but also early detection of such intrusions have been implemented. However, considering current and frequent international terrorist attacks around the world, nuclear security measures against insider threats in facilities, including a system to determine the trustworthiness of personnel, have also been discussed and then going to be implemented. On the other hand, risks of insider threats in nuclear fuel cycle facilities have rarely been released in detail in the past. The authors have made a conceptual study on the possible occurrence of insider threats and their influence at each type of nuclear fuel cycle facility, from viewpoints of nuclear material types, processes and work methods of each facility.