At the moment the "Shelter" is equipped with systems that monitor the radiological situation inside this facility, as well as control systems of building structures. It should be noted that the object "Shelter" is not only the destroyed reactor of Chernobyl nuclear power plant. Under the object "Shelter" means: the destroyed Block B second stage of Chernobyl - the fourth block; constructions built around the destroyed reactor, de aerator and what not machine room, part of block B, part of the block, the composition of the object "Shelter" also includes a local area, which is an area adjacent to the object - a protected zone, which is equipped with monitoring systems and surveillance. The structure of the shelter system, and includes elements designed to carry out works to maintain the object in a safe condition.? That is, at this time the shelter is destroyed severe accident 4-th block of the Chernobyl NPP, which has lost all functionality of the unit and on which implementation of priority activities to reduce the effects of the accident and which continue to ensure nuclear and radiation safety. Current activities at the Shelter is to provide protection for the Chernobyl NPP exclusion zone personnel, population and environment from radiation hazards, which is conditioned by the presence of the Shelter of nuclear and radiation-hazardous materials.? More details on the status of the Shelter "You can find here - http://www.ibrae.ac.ru/~lgis/sg/index.html.