Analysis and Exploration of the Boric Acid Recirculation Loop in the RIS Systems of Unit 3 and 4 of Qinshan No.2 Nuclear Power Plant
This paper analyzed the root causes of large working heat dissipation of the boric acid recirculation pump,unreasonable design of heat insulation layer of the boric acid surge tank and the air conduction due to the overflow pipeline of the boric acid surge tank by focusing on a series of problems,like high operating tempera-ture of the boric acid recirculation loop,a large amount of boron crystallization in the boric acid surge tank chamber,frequently water replenishing due to the boric acid surge tank's liquid level drops too fast in 3,4 Unit 3&4 of Qinshan 2.And remarkable results have been achieved by equipping with the blind plate and the manu-al ball valve for the overflow pipeline of the boric acid surge tank,removing the heat insulation layer and using the temporary fan.In the final part of this paper,the reliable and stable operation of the boric acid recirculation loop is further optimized by adding the logic of electric heater,changing the type of the boric acid recirculation pump,adding air intake in the boric acid surge tank chamber and changing the position of the water supply valve,etc.
high temperatureboron crystallizationoverflowsurge tankrecirculation pump
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