Bolshov 's cooling plate went unfielded during the Chernobyl disaster .
Bolshov 's graphite-concrete `` sandwich , '' would be similar in concept to later `` core-catchers '' , which are now part of many nuclear reactor designs.-  However Bolshov 's cooling plate , would similarly go unfielded , as upon reports by the investigative team , the corium had stopped , with the precautionary underground channel , then recognized as redundant and simply filled with concrete to strengthen the foundation below the reactor .
Chernobyl disaster