P109 CEEFAX 109 Sat 13 Feb 22:22/58       The Soviet Union and the United States are hoping to conduct joint nuclear tests in the first half of this year. The announcement was made bz Mr Igor Palenzkh, head of the Soviet team at the nuclear test ban talks in Geneva. Mr Palinykh, speaking on arrival in Geneva for the second round of talks, was also very positive about hopes of progress in the talks to ban the tests. The USSR has carried out a nuclear test explosion with a yield of between 20-50 kilotonnes at Semipalatinsk in Central Asia. News index 102/202 Newsreel 119/219