核电厂海工构筑物氯盐腐蚀耐久性监测研究综述

Review of Chloride Corrosion Durability Monitoring of Marine Structures in Nuclear Power Plants

核电厂海工构筑物耐久性劣化会削弱结构强度,导致混凝土开裂、分层和剥落,对结构的安全性和耐久性造成不良影响。现存核电厂在原设计、建造、运营中对混凝土防腐的重要性和必要性考虑严重不足,防腐措施控制不够严格,氯盐腐蚀问题突出。若能在结构中预埋或后装可靠的监测传感器,实时监测和分析结构损伤数据,实现提前预警和寿命预测,对保证核电厂老化管理和延寿期间的正常运行具有重要意义。通过对核电厂海工构筑物典型耐久性问题的概述,及对海工构筑物最严重的氯盐腐蚀可采用的耐久性监测方法的综述,以期准确把握核电厂海工构筑物耐久性问题和监测的研究现状,为预警诊治提供参考。

Durability deterioration of marine structures in nuclear power plants causes the reinforcement corrosion and may lead to concrete cracking,delamination,and spalling,which poses a great threat to the safety and durability of structures.The consideration of anti-corrosion importance and necessity of concrete are seriously inadequate in the design,construction,and operation of existing nuclear power plants.The anti-corrosion countermeasures are not controlled in a sufficiently strict manner,and the durability problem is severe,especially the corrosion durability of chlorides.If reliable monitoring sensors could be embedded or installed in the structure,the structural damage data can be uploaded,analyzed,and processed in real time to achieve early warnings and life prediction,which is of great significance to ensure the normal operation of the aging management and life extension period of the nuclear power plants.This paper summarized the typical durability problems of marine structures in nuclear power plants and the common durability monitoring methods for the most serious chloride corrosion in marine structures for an accurate grasp of the current research status of the durability problems and monitoring of marine structures in nuclear power plants.It may provide some reference for research on durability warning and diagnosis.