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Institution: Hosei University/Faculty of Sustainability Studies

Period of stay: 26 April 2022 - 31 March 2023










Akiko Okamatsu graduated from Jouchi (Sophia) University (Tokyo).  She is a Member of the Compliance Group of 1996 London Protocol, Special Advisor to the Ministry of Environment (Japan), and Guest Researcher of Research Office of the Standing Committee on Foreign Affairs and Defense, House of Councilors (Japan).

Her job career started at Research Associate, Jouchi University, Faculty of Law, then, Postdoctoral Fellow at National Institute for Environmental Studies, Assistant Professor at Shobi University, etc., and present status up to now. She was also a visiting scholar of Harvard Law School from 2013 to 2014.

Research Area:

International Atomic Energy Law, Law of the Sea, International Environmental Law

Research Title:

Non-Proliferation of the Nuclear Weapons

Research Outline:

The objective of my research is to consider a feasible legal framework to strengthen the effectiveness of the Treaty on Non-Proliferation of Nuclear Weapons (NPT), especially in the context of the security in the East Asia in the near future.  The NPT has been an essential keystone for international security.  The International Atomic Energy Agency (IAEA) safeguard system has been playing an important role as well.  In fact, nuclear war has been avoided due to the NPT and the activities of the IAEA, and the NPT and the IAEA have definitely contributed to it.

However, it is apparent that the NPT regime is vulnerable in its discriminatory scheme, which allows nuclear-weapon state parties to maintain nuclear weapons and nuclear explosive devices, and at the same time, prohibits non-nuclear-weapon state parties from possessing them.  Although all efforts have been devoted in order to complement this system, this inherent fragility has caused many problems.

In this situation, in order to strengthen the NPT, the most realistic way is to include all non-NPT states within the NPT regime.  In this context, sanctions against the state parties of the NPT which violate the rules therein should be also seriously considered


Casebook of International Environmental Law (Co-editor, 2020), Environment and Law: the Important Issues under International Law and Foreign Law, (Co-editor, 2010), “Problems Concerning Discharge of ALPS Treated Water into the Ocean from Fukushima Daiichi Nuclear Power Plant”(2022), “International Legal Framework for the Disposal of Radioactive Waste”(2022), “IAEA Safeguard” (2017), “International Management on Transfer of Nuclear Materials and Equipment” (2016), “The Present Status and Future of the Convention on the Prevention of Marine Pollution by Dumping of Wastes and Other Matter 1972 and 1996 Protocol Thereto” (2015), “Environmental Impact Assessment in International Law”(2015), “Interaction between International Law and Domestic Law on the Vessel-Source Pollution in the Arctic Ocean” (2015) etc.


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