REVERSE WATERPROOFING METHOD APPLIED TO NUCLEAR ISLAND PLANT OF LING'AO NUCLEAR POWER STATION

Roof waterproofing standard of nuclear island plant of Ling'ao Nuclear Power Station was designed as gradeⅠ.Reverse wa-terproofing method was adopted which were one course polyurethane and two course macromolecular sheet.Additional waterproof course have to be set at the parts where there is heavy rainwater drainage.This mea-sure can effectively secure waterproof quality;shorten construction dura-tion;extend service life as well.But the disadvantage is the inconve-nience of maintenance.