Publication Laka-library:
Safety aspects of the object shelter of the Chernobyl nuclear power plant unit 4
| Author | IAEA |
| Date | 1995 |
| Classification | 2.34.8.15/01 (CHERNOBYL ACCIDENT - CONSEQUENCES SURROUNDINGS - SARCOPHAGUS) |
| Front | 
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From the publication:
SUMMARY The encasement "Ukrytie" (Shelter) is considered as a combination of constructions, covering Unit 4 of the Chernobyl nuclear plant which was destroyed during the accident on April 26, 1986. Its safety related aspects were addressed in the report of the IABA safety mission to Chernobyl (7-17 March 1994) which stated in a general comment that the "Shelter safety is a major concern both due to on site and off site radiological impact". The presence of fuel containing masses inside the Shelter and the condition of engineered constructions forming it can under certain circumstances affect the safety of the operating units of the plant. On the other hand, the negative impact of the operating Unit 3 on the Shelter cannot be excluded either; it could lead to the degradation of the current condition of the Shelter and lead to serious consequences. In 1993 the Chernobyl plant organization was officially designated as the operator, making it legally responsible for decision-making and safety of the Shelter. Ukrainian authorities have begun addressing standards and regulations covering the Shelter. But basic safety provisions remain to be developed and safety report requirements set, including environmental requirements and criteria for the site and surrounding territory remain to be developed. Basic provisions to ensure stability of the Shelter constructions also remain to be established. The Agency in 1994 commissioned Mr. Alexander Borovoy (Kurchatov Institute, Russia) to compile additional information on the Shelter and review its safety aspects. This work was completed at the end of 1994 and is presented in this publication. The review gives a short history of the creation of the Shelter, summarizes the most important information about its current condition and poss1ble accident scenarios, considers official documents on the subject and gives an expert estimation of the safety situation of the Shelter. The report includes the latest experimental and calculated results of research and exploration. It also provides a description of the strategy, which emerged in the course of an international competition in 1993, to transform the Shelter into an environmentally safe object. Its main conclusion is the necessity in the nearest future to take actions to stabilize the Shelter for 10 -15 years, in order to provide time to construct the envisaged second encasement (Shelter-2).
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