Thermal power plant explosion takes a life: What’s the reason?

The Urban Development, Technical and Fire Safety Inspectorate (UDTFS) twice issued a negative conclusion to the company operating a foundry in the area of HrazJEK. The latter, in turn, issued a statement denying the inspection body’s statement and added that no safety issues were recorded during the close inspection. Why did an explosion take place at the Hrazdan Thermal Power Plant? Details in the video: