It escapes into space and that's the main problem with it. But it doesn't create steam explosions and hydrogen buildup under ionizing radiation (also explosive)

It escapes into space and that's the main problem with it. But it doesn't create steam explosions and hydrogen buildup under ionizing radiation (also explosive). My main gripes with pebble bed reactors is not helium, but pebbles cracking, graphite fires and complications with fuel reprocessing. Helium just ads another layer of complications because it's quite scarce and easily lost. Also the installed capacity of this reactor is quite underwhelming. But it's nice that the Chinese have built it and are testing and advancing the technology developed in Germany during the '80s.