VIENNA — Japan’s reaction to its nuclear crisis has been swift and responsible, said the only survivor of a four-man group that entered the Chernobyl site after it was covered with a concrete hood. It would be wrong to blame Japan for not offering enough information directly after the Fukushima accident, said Anatoly Tkachuk, a senior official at Chernobyl when its No. 4 reactor blew up in 1986, […]