The reasons for the partial collapse of the roof on one section of the Chernobyl nuclear power plant is of negative factors such as the lack of data on damage floors and roof decks are in an accident in 1986, according to the findings of the two commissions that investigated the incident.
In early February, in the engine room of the fourth unit of the Chernobyl nuclear power plant was a partial destruction of the walls and light roof, the area of the collapse was about 600 square meters. The press service of the CNPP said that the change of the radiation situation at the site of Chernobyl exclusion zone and no, no one was hurt. A commission was established to investigate the incident.
"The Commission considers that the possible cause of the collapse of the roof piece turbine hall and eight wall panels (NPP), a drop in farm due to the combination of negative factors, in particular, the lack of data on the actual damage of the roof trusses and decking in an accident in 1986," — said in a conclusions of experts.
According to experts, the construction is based on the column, which experienced significant damage in an accident in 1986, which is another negative factor. The displacement of the column has to bend a farm, and this resulted in the additional load. Three links farms do not meet the requirements of the project, and it did not provide the design resistance. Experts also cited as probable causes of the collapse of the possibility of corrosion of the mount truss and wall panels, as well as non-project distribution of loads and dynamic punch. Thus, in their view, the snow load at the time of the incident is not excessive.
Experts note that prevent the destruction of the damaged roof structures failed due to "lack of capacity of the visual control of technical condition of structures due to lack of safe approaches and extremely dangerous radiation environment." According to the Commission's findings, supporting structures, adjacent to the destroyed, "relatively stable."