The Integrated Support Center for Nuclear Nonproliferation and Nuclear Security (ISCN) of Japan Atomic Energy Agency (JAEA) and the World Institute for Nuclear Security (WINS) co-hosted a theatre-based workshop on “Supply-chain Risk in Nuclear Security” as an online event for Japanese stakeholders. The proposed paper will feature two key findings: the effectiveness of providing an online activity on nuclear security around filmed theatre scenes and the second one is a case study of awareness rising on supply chain risk in nuclear security in Japan. The first part of the article will talk through the design process of an online event with the purpose to raise nuclear security awareness. ISCN and WINS have held many “theater-style” events that utilize dramatized scenarios on a hypothetical nuclear security event, and gave participants opportunities to have discussions based on these scenes for almost a decade. Past workshops, which have all been in-person events in Tokyo involved actors playing scenarios on stage. The most recent workshop was the first of its kind to be held as an online event on 16 and 17 February 2021 due to the COVID 19 situation. ISCN requested WINS to duplicate the successful format and create an online version. To accommodate ISCN’s needs, WINS explored various options on how to replicate the theatre format, including useful discussion opportunities, and eventually successfully delivered an on-line event designed around recorded theatre scenes and professional facilitation. In respect to awareness raising for supply chain risk in nuclear security, the article will explain findings formed through the discussion among the participants of the online event. The supply chain risk in the context of nuclear security is a relatively new topic in the nuclear security community in Japan. The article will examine the importance of identifying supply-chain risks and name possible measures to address supply-chain risk management in nuclear security through the findings from the discussions of the workshop. It will then consider how to use some of these findings to the human resource development activity.