Study On Open-ended Circulating Water Cooling System For Conventional Island Of Qinshan Phase ? Nuclear Power Plant In Unit 1&2

Open-ended circulating water cooling system for conventional island of Qinshan Phase II nuclear power plant provides cooling water to the conventional island equipment.Its stable operation is directly related to the equipment of conventional island state.The system water is from Hangzhou Bay.The Hangzhou Bay is located in the place where Qiantang River go into the sea,mixed with a lot of sediment.So the cooling water provides very bad environment for equipment's running.Since the system run,the equipment in the system broke down frequently,not only the common problem which appears in the sea equipment but also had erosion corrosion problem.According the record,in 85% maintains actives were there failures.System equipment has a lot of problem and the reliability is very low.This article first summaries the current situations,and bring the system into AFT Fathom 7.0,calculate the system's running,and finding some the weakness of the system: Plate heat exchanger with titanium plate erosion problem and Mother tube sedimentation.To find out the solution,we do two experiments and theoretical analysis,then we found the answer: the sand went into the Plate heat exchanger is too big to go through the plate,the tube is also too large and have a low velocity.At last,The optimization scheme is put forward,which is suggested to increase the size and arrangement of the water filter and the change of the pipe size.Some of these optimization schemes is used in 3/4# Qinshan Phase II nuclear power plant,and in 3/4# Unit of Qinshan Phase II nuclear power plant,the system is more reliable and has less problem than 1/2# Unit,it's believe that if all the advices put forward in the 12# unit,the system will be more steady and have less problems?...