Decommissioning Strategy Plan - RBMK-1000 Reactor


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Extra resources for Decommissioning Strategy Plan - RBMK-1000 Reactor [Leningrad] - Appendixes

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6. 7. 1). The following characterized the upgrades and repairs of single-pass production reactors: ● the brief shutdown times for performing repairs and upgrades . the lack of holding time for the shutdown reactors to allow a decrease in the dose rate from the natural decay of the short-lived and medium-lived radionuclides . the lack of domestic practical experience in similar work . u-especuliar to single-pass plutonium-production reactors. 1 Upgrade of the “A” Plutonium-Production Reactor The causes behind the shutdown of the “A” production reactor for modernization and major repair in 1963 were corrosion damage to subassemblies, deterioration of equipment, and a wide range of desi~ engineering, and planning deficiencies that revealed themselves over the 15-year operating period and hindered its norrmd operation and maintenance.

During decommissioning, physical protection and fissile and radioactive material accountability must be organized. In addition, the safety of persomel, the populace, and the environment must be ensured (both during decommissioning and following its completion, if necessary). Based on existing world practice in decommissioning uranium-graphite plutonium-production reactors, the three following decommissioning alternatives have been reviewed and analyzed: SAFESTOR, the reactor’s structural elements are not dismantled for a storage period of 50 to 100 years.

2 The Decommissioning Optionfor the OK-204 and OK-205 Reactors Based on an analysis of the economic situation in Russi~ the lack of special 6quipment needed for dismantling highly radioactive reactor equipment, and the lack of the storage or burial sites for radioactive waste, entombment is being considered as an option for the decommissioning of the OK-204 and OK-205 reactors. Under this optio~ a reactor is isolated and hermetically sealed in’ place for a period of 100 years or longer. It is proposed that the machine room equipment and other reactor systems be dismantled when the activity of the equipment and systems has decayed to levels that make it possible to pdonn dismantling with conventional tools.

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