The pebble bed reactor has inherently safe features concerning loss of coolant, but it is not inherently safe: There are other sever accidents not known in conv

The pebble bed reactor has inherently safe features concerning loss of coolant, but it is not inherently safe: There are other sever accidents not known in conventional reactors, like graphite fire (as it happened in Chernobyl, too) and water ingress into the core with subsequent explosions.