HONG Kong residents need not seek shelter during a nuclear emergency, unless they are on Ping Chau, according to the Government. The advice is in a booklet, the Daya Bay Nuclear Power Station Contingency Plan, issued yesterday. But it outraged United Democrat legislator, the Reverend Fung Chi-wood, who accused the Government of being ''totally irresponsible'' for issuing such ''dangerous and perhaps life-threatening recommendations''. Advice is given on avoiding exposure to radioactive material carried into the atmosphere in a plume or cloud. Under the contingency plan, plume counter-measures will only be taken in an area within 20 kilometres of the Daya Bay plant in China. Given this criteria, Ping Chau, in the far east of the territory, and the waters of Mirs Bay are in danger and the island would be evacuated in a nuclear emergency. And if poor weather makes evacuation impossible, people will be asked to shelter at the police post, former army training camp, or the Agriculture and Fisheries Department centre. The advice states: ''International experts on nuclear safety have advised that sheltering and evacuation will not be required elsewhere in Hong Kong.'' Hong Kong island is about 50 kms from the nuclear plant. Mr Fung said: ''Advising people who are further than 20 km from Daya Bay not to take shelter is totally irresponsible. ''The Government is endangering the lives of hundreds of thousands of people who could be exposed to radiation simply because they want to play down the potential risk of radiation exposure.'' ''The Government claims so-called experts have said counter-measures against radiation exposure only need to be considered within 20 km of the plant yet other studies set the limit at 50 km.'' A government spokesman said the plan was produced in accordance with international practices.