sentences:  On 28 November 1975, a fuel channel in Unit 1 suffered a loss of coolant, resulting in the degradation of a nuclear fuel assembly that led to a significant release of radiation lasting for one month.Immediately after the accident, the radiation level in Sosnovy Bor, from the affected power unit, was 600 mR/h; in total, 1.5 MCi was released into the environment.The exposed inhabitants of the Baltic region were not notified of the danger.