板式换热器放射性去污实践探索  

Practical exploration for radioactive decontamination of plate heat exchanger

作　　者：李玉鑫 李彦超 李圣松 梁旭 LI Yuxin;LI Yanchao;LI Shengsong;LIANG Xu(Liaoning Hongyanhe Nuclear Power LTD,Liaoning Dalian 116001)

机构地区：[1]辽宁红沿河核电有限公司,辽宁大连116001

出　　处：《辐射防护通讯》2024年第1期25-30,共6页Radiation Protection Bulletin

摘　　要：核电站反应堆和乏燃料水池冷却处理系统(PTR)及设备冷却水系统(RRI)中使用的板式换热器,结构复杂,运行过程中放射性热点易淤积在导流函道及沟槽等死角位置,放射性去污难度较大,业内以作为放射性固体废物处理为主。板式换热器作为高价值专用设备,大量污染报废给成本管控和放射性废物最小化管理带来了较大的压力。针对上述问题,红沿河核电厂实践探索了“放射性污染板式换热器去污方法”,采用“化学去污+泡沫去污+可剥离膜去污”分段去污方法开展试验,经去污后的换热器表面污染水平均小于0.4 Bq/cm^(2),4个阶段累计去污率约为99.80%,193片放射性污染板式换热器全部实现复用。Plate heat exchangers used in the cooling and treatment system(PTR)and equipment cooling water system(RRI)of nuclear power plant reactors and spent fuel pools have a complex structure.During opera-tion,radioactive hotspots are prone to accumulate at blind spots such as guide channels and grooves,making radioactive decontamination difficult.In the industry,they are mainly treated as solid radioactive waste.Plate heat exchangers are high-value specialized equipment,therefore NPP operators face significant pressure in cost control and radioactive waste minimization management due to large amount of waste disposal.In view of the a-bove mentioned problems,Hongyanhe Nuclear Power Plant practices and explores decontamination method of radioactive contaminated plate heat exchanger,and adopts the sectional decontamination method"chemical decontamination+foam decontamination+strippable film decontamination"to carry out the test.After decon-tamination,the surface contamination level of the heat exchanger is less than 0.4 Bq/cm^(2),and the cumulative decontamination rate of the four stages is about 99.80%.193 radioactive contaminated plate heat exchangers are all reused.

关 键 词：板式换热器 放射性去污 去污率 

分 类 号：TL752.2[核科学技术—辐射防护及环境保护]