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, 5 kilometres (3.1 mi) from the affected power unit, was 600 mR/h; in total, 1.5 MCi was released into the environment.[16] The exposed inhabitants of the Baltic region were not notified of the danger. The accident was not reported in the media.