Engineers consider burying Fukushima to block radiation 18 Mar 2011 Japanese engineers conceded on Friday that burying a crippled nuclear reactor in sand and concrete may be the only way to prevent a catastrophic radiation leak, the method used to seal huge leakages from Chernobyl in 1986. Officials said they still hoped to fix a power cable to at least two reactors to restart water pumps needed to cool overheating nuclear fuel rods. Workers also sprayed water on the No.3 reactor, one of the most critical of the plant's six.