SAFE DECOMMISSIONING OF MOBILE NUCLEAR POWER PLANT

摘要

The paper addresses some issues for ensuring radiation safety during the process of decommissioning the 630 kW "Pamir-630D" mobile nuclear power plant (MNPP). That nuclear power plant consisted of a gas cooled reactor (weight of 76.5t), gas turbine-driven set (76t), two control units (2×20t), and an auxiliary unit (20t). The reactor and turbine-driven set were supposed to be put on transport platforms and carried by tractors. The control and auxiliary units were set on track beds. The "Pamir-630D" was constructed and tested in an appropriate building. The set-up time was no greater than six hours after all units of the MNPP had reached the site. The "Pamir-630D" was ready to be moved to another site in 30 hours after the shut down. Service lifetime of "Pamir-630D" was 10 years: 7 years of storage and 3 years of operation. Operational lifetime was no less than 10000 hours (non-stop operational period was no longer than 2000 hours). Dose rate at the boundary of the restrictive area was no more than 6.5 mR/h at the time of reactor operation and no greater than 300 mR/h on the side surface and 1000 mR/h on the end surface of the biological shielding of the reactor, 24 hours after shut down.