The present call for tenders aims to award a Framework Contract for the provision of research and consulting services in the form of study in the field of Nuclear Technologies for EU Defence Energy Systems. The general objective of this procurement is to ensure contractual support aimed at addressing emerging questions related to advanced nuclear technologies, defence energy resilience, energy security and the protection of critical energy infrastructure. In order to achieve the objectives of this procurement, EDA intends to award a Framework Contract comprising the following tasks/activities: studies, assessments, expert consultations, workshops and analytical activities related to advanced nuclear technologies, defence energy resilience, energy security, the protection of critical energy infrastructure, regulatory and licensing frameworks, fuel supply considerations, implementation pathways, cyber, hybrid and physical security aspects, and capability development activities.