The Chernobyl Nuclear Power Plant sarcophagus was built Building and finished Process_end by December 1986 , and would also provide Supply radiological protection Preventing_or_letting for the crews of the undamaged Destroying reactors at the site , with No .

Due Causation to the continued deterioration of the sarcophagus , both it and the No .

4 reactor were further enclosed in 2017 by the Chernobyl New Safe Confinement , a larger enclosure that allows Preventing_or_letting the removal of both the sarcophagus and the reactor debris , while containing the radioactive hazard .