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

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The work involved in the repair and replacement of the upper water pipelines did not present any technical difficulty, since these pipelines were situated in an accessible work area with a mild radiation environment. The individual doses sustained by personnel during the performance of work associated with the repairs and upgrades of the OK-110 type plutonium-production reactors did not exceed 3 roentgenequivalent man over a three-month period. Here, the total number of personnel taking part in the performance of this work came to approximately 120 persons.

26 According to the plan and the technological process, it was necessary to: . dismantle all the equipment and systems located in the lower part of the nuclear reactor (250 tonnes) . recondition the threaded recesses for securing the reloading device in the lower bottom loadbearing structure lattice . bore out the lower pipes to accommodate the increased diameter of the technological channels . inspect and recondition the reloading devices, replacing any devices not suitable for repair with new ones ● install new or repaired equipment and systems of the nuclear reactor.

The foam decontamination method was used for the first time during the OK-204 upgrade and made it possible to reduce radiation emission rate levels by several fwtors. Therefore, despite a two- and three-fold increase in the volume and the labor intensity of the work involved the overall personnel collective radiation dose came to a total 700 roentgen equivalents-man compared with 1,300 roentgen equivalents-man for the EI-2 reactor and 1,700 roentgen equivalents-man for the OK-140 reactor. According to the plan and the technological process developed, the following reactor systems and components were subject to dismantling: ● the cassettes (the group reloading de~ces) .

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Decommissioning Strategy Plan - RBMK-1000 Reactor [Leningrad] - Appendixes

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