As foreseen in the IUR Statutes, the IUR does not only have a Membership policy on an individual basis but also on an "Organisation basis: Institutes and Companies". They are called "Sustaining Members". Sustaining Members are for profit and non-profit organizations, Institutions, or Associations concerned with the affairs and purpose of the Society and who wish to foster the Society's purposes. Information can be obtained from the General Secretary.

NRPA - Norwegian Radiation Protection Authority

SCK.CEN - The Belgian Nuclear Research Centre

ANPA - Agenzia Nazionale per la Protezione dell' Ambiente

IRSN-DEI/SECRE - Institute for Radioprotection and Nuclear Safety

ANDRA - National Radioactive Waste Management Agency

BNFL - British Nuclear Fuel Limited

ENRESA - Empresa Nacional de Residuos Radiactivos

NIREX

NUMO - Japanese Waste Management Organisation

POSIVA - Finnish Radioactive Waste Management Organisation

SKB - Svensk Kärnbränslehantering AB

UKAEA - UK Atomic Energy Authority

EDF - Recherche et Developpement