TWO Chinese officials yesterday watched a run-through of Hongkong's contingency plans for a nuclear accident at the Daya Bay power station. The Guangzhou-based officials were in the territory as observers of the drill, which involved more than 200 Hongkong government employees from 38 departments and branches. Although the presence of the Chinese was seen as a positive step, plans for a joint Hongkong-China emergency response exercise remain up in the air, according to a Security Branch spokesman. He said it was ''pure speculation'' whether or not a joint exercise would take place before the nuclear plant, which is 50 kilometres from Hongkong, starts up in July. ''We would certainly want to have a joint exercise with the Chinese authorities but there are no immediate plans to do so,'' he said, adding that talks about such an exercise were continuing. The two Chinese officials observing the exercise were Mr Li Yachui, chief engineer at the Guangdong Research and Monitoring Centre of Environmental Radiation, and Mr Li Dhongqin, director and senior engineer of the South China Sea Monitoring Centre of Oceanic Administration. Also observing were two officials from the International Atomic Energy Agency. The exercise was ''purely sitting in rooms and reacting to an evolving scenario'', the Security Branch spokesman said. It will continue today. The exercise started with participants posing as reporters trying to check out rumours of a Daya Bay accident, and Hongkong officials trying to confirm the rumours. Also yesterday, the environmental group Friends of the Earth complained that the Government had not done enough to inform the public about the territory's contingency plans in case of a Daya Bay accident. ''The public should be given a better picture,'' said Mrs Mei Ng Fong Siu-mei, the group's director. ''Just simply telling them it's safe does not help.'' She also said the Government should provide more details about the two-day drill, which reporters were not permitted to observe. Mrs Ng called for the Government to set up a hotline for those with questions about Daya Bay. The Security Branch spokesman said the Government was preparing a booklet to explain Hongkong's contingency plan, which would be ready before July.