Yesterday, I took an excursion to Wol-song nuclear power plant with my pupils and my co-teachers. according to the guide(woman) explanation, as this plant is national security facility, "the security investigation of this plant is as strict as the Blue House(President's office)'s". after twice security investigation, we can get into. there are four atomic reactors in this plant. the first reactor was constructed completely in the early 1980's. the second reactor done in 1997, the third in 1998,the fourth in 1999. now, four reactors are operating. another two reactors are under construction. this four reactors produce a great number of electricity. the quantity of the electricity is 2,778,000kW- about 700mega watt*4-. It's so big big scale. to cool these reactors, heavy water is used. the type of this reactor is PHWR-pressed heavy water reactor-. to
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