The decommissioning Concept for WWR-M research reactor is developed to meet the requirements of the current Ukrainian legislation. The main goal of the Concept is to provide a strategic stage of the work planning, including all the required justifications with a sufficient level of detail. It will allow during the next planning stage to develop the decommissioning project and other documents required to obtain the decommissioning license. The Concept is the institutional and technical document, which defines and substantiates the basic administrative, organizational, and technical measures for the preparation and implementation of the reactor decommissioning. It also describes the main activities and works, defines the procedure, conditions for their implementation and provision, and planned deadlines.
The WWR-M is a light-water-cooled and moderated heterogeneous research reactor with a thermal output of 10 MW. The final decommissioning planning is in progress now. The general decommissioning strategy consists of the dismantling and separate removal of the bulky elements as a whole (in one piece) without preliminary segmentation. The dismantling of the primary and secondary cooling loops is considered as one of the key tasks; a separate dismantling design has been developed. The baseline principles for the technical solution and safety are presented in the given paper. Results of the dose assessment showed that the work can be performed at a collective dose of less than 20 man-mSv.
Following the demands established by the current Ukrainian legislation, the Decommissioning Concept for the WWR-M research reactor was recently approved. The Concept envisages a strategy of immediate dismantling; it identifies and justifies the main technical and organizational measures for the preparation and implementation of decommissioning, the sequence of planned works and activities, as well as the necessary conditions and infrastructure. Decommissioning requires proper planning and demonstration that all planned dismantling works will be carried out safely. Presented safety assessment is a mandatory component of the Concept and the most important element of the overarching technological scheme. The purpose of the safety analysis is to provide input for detailed planning on how to ensure safety during decommissioning. Based on the results of the safety analysis, the measures to ensure radiation protection are defined while justifying their necessity and sufficiency.
Описано систему радіаційного захистута контролю дослідницького реактора ВВР-М і досвід її експлуатації. Подано перелік радіаційних факторів при нормальній роботі реактора та встановлено основні напрямки діяльності щодо забезпечення радіаційної безпеки. Наведено статистичну інформацію стосовно контролю опромінення персоналу та викидів радіоактивних аерозолів. Описано задачі та структуру системи аварійного реагування на аварії та надзвичайні ситуації. Представлено комплекс технічних рішень з модернізації системи радіаційного захисту та контролю.
Подано аналіз факторів, які обумовлюють вибір стратегії зняття з експлуатації дослідницького ядерного реактора ВВР-М Інституту ядерних досліджень НАН України. Згідно з обраною стратегією визначено послідовність етапів зняття з експлуатації, склад робіт на цих етапах, а також необхідні умови та інфраструктура для своєчасного і ефективного виконання запланованих заходів.
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