The increase in radiation background in Severodvinsk caused an explosion at the ICBM range
According to the comment of the representatives of the Ministry of Defense, which was given to the TASS publication, the incident occurred during tests of a liquid rocket engine. Injuries were received by both military and civilian specialists. No further details were officially reported, which implies inconsistency of information. According to other sources, the explosion and fire did not occur at the training ground, but on board an unnamed military vessel. Immediately before the incident, some work was carried out by the manufacturer's employees at the test propulsion system. Also, the Ministry of Defense insists that as a result of the accident, no toxic, toxic or radioactive substances were released into the atmosphere. According to unverified data, the number of victims can reach 15 people. In the direction of the village of Nenoksa, near which the training ground is located, air ambulance was sent.
The exact reasons for increasing the background radiation have to be established by specialists of the regional rescue service. Since 1954, all ballistic missiles that are designed to be placed on the ships of the Russian Navy have been tested at the training ground near Nenoksa. For military missiles, either solid propellant propulsion systems or liquid propellant engines with UDMH + AT fuel pair are used - asymmetric dimethylhydrazine (heptyl) and nitrogen tetraoxide (amyl). These two components are extremely toxic, but not radioactive. Their choice is due to high efficiency and the possibility of long-term storage of the rocket. Perhaps there was a spill and incomplete combustion of heptyl, which caused the work of emergency services in costumes of the Russian Children's Hospital, as reported by the online edition of Mash.