A DAYA Bay watchdog, United Democrats legislator the Reverend Fung Chi-wood, is to formally lodge his increasing concern about safety at the nuclear plant with the Economic Services Secretary, Gordon Siu Kwing-chue. Mr Fung said problems with the plant's non-atomic operating system - revealed in the South China Morning Post - were reasons for concern. The first problem involved pipes in the conventional ''island'' leaking high pressure steam, while the second - also in the conventional island - involved leaking condenser tubes. Both problems have been fixed. ''Any leakage is a worry in a nuclear plant and the fact there was leakage detected at Daya Bay raises serious concerns about the quality of equipment and technical expertise,'' Mr Fung said. ''Although the problems were remedied, their very existence in the first place may indicate poor design and perhaps even the need for a different design. ''I will be seeking a meeting with Mr Siu during which I will convey my concerns about the plant's safety.'' Meanwhile, Mr Fung received no additional information about the scheduling of the nuclear plant's opening day after meeting Hong Kong Nuclear Investment Company officials yesterday. He said officials claimed reports of delays to the plant's opening were incorrect as there was never a fixed date.