NUSTEC conducts research studies and support activities covering wide aspects of nuclear disaster prevention, with the system for predicting environmental emergency dose information (SPEEDI) at the core. NUSTEC closely cooperates, towards the harmonized promotion of activities for nuclear disaster prevention in Japan, with the national government, local governments, and other related organizations.

NUSTEC operates and maintains SPEEDI network system under the commission by the Ministry of Education, Culture, Sports, Science and Technology (MEXT). Taking into account meteorological and geological conditions, the system can predict the air concentration/dose of radioactive materials in the environment during emergencies in which large amounts of radioactive materials are emitted from nuclear facilities.
In case of an emergency NUSTEC quickly provides, through this network system, the MEXT, Ministry of Economy, Trade and Industry (METI), Nuclear Safety Commission (NSC), related local governments and Off-site Emergency Centers with information necessary for emergency actions.
NUSTEC also conducts investigations to help promote more efficient nuclear disaster-prevention activities. These include the development of a database system of necessary equipment and materials, and radiological airborne surveys in case of emergency. NUSTEC also provides training courses for people involved in nuclear disaster prevention.
Furthermore, communication meetings for nuclear disaster prevention are regularly held to promote cooperation among organizations related to the prevention of nuclear disaster, exchanging various kinds of information relating to the latest conditions at the related organizations.