country flag of Japan


Theft Ranking
Has Weapons-Usable Nuclear Materials


Japan is the most improved state in the theft ranking, increasing its score by 4 points from 2014, and is ranked 13th. Japan improved by ratifying the 2005 Amendment to the Convention on the Physical Protection of Nuclear Material, publishing an annual report on nuclear security, and hosting an international peer review. In the future, Japan could further improve its nuclear materials security conditions by updating laws and regulations to reflect the latest IAEA guidelines for securing nuclear materials in transport, requiring more stringent personnel vetting, and requiring cybersecurity tests and assessments. Japan’s nuclear materials security conditions remain adversely affected by its high and increasing quantities of weapons-usable nuclear materials and the large number of sites where those materials are located.

Category & Indicator Scores

Category & Indicators
Rank / Score / Δ

Quantities and Sites

Quantities of Nuclear Materials

Sites and Transportation

Material Production / Elimination Trends

Security and Control Measures

On-site Physical Protection

Control and Accounting Procedures

Insider Threat Prevention

Physical Security During Transport

Response Capabilities


Global Norms

International Legal Commitments

Voluntary Commitments

International Assurances

Domestic Commitments and Capacity

UNSCR 1540 Implementation

Domestic Nuclear Materials Security Legislation

Safeguards Adherence and Compliance

Independent Regulatory Agency

Risk Environment

Political Stability

Effective Governance

Pervasiveness of Corruption

Group(s) Interested in Illicitly Acquiring Materials


= denotes tie in rank
Δ denotes change in score between and
– denotes no change between and
All countries are scored 0–100, where 100 = most favorable nuclear security conditions

Note on Scores

Indicator scores equal the sum of the subindicator scores. Scores are then normalized 0-100, where 100 = most favorable nuclear materials security conditions.