压水堆腐蚀产物行为影响因素及模型综述

Review of Factors Affecting Corrosion Products Behavior and Related Models

压水堆一回路腐蚀产物沉积对反应堆的安全、稳定运行有重要影响。迄今为止,针对腐蚀产物行为已开展了广泛研究。本文概述了腐蚀产物行为的主要影响因素,包括水化学条件、热通量、冷却剂流速等。合适的水化学条件,如pH控制在7.4附近、溶解H浓度在25~50 cm^(3)/kg H_(2)O之间,会降低腐蚀产物生成量。热通量、冷却剂流速对腐蚀产物沉积也有不可忽视的影响。另外,对具有代表性的腐蚀产物行为预测模型及燃料元件表面腐蚀产物沉积影响模型进行了介绍,并对今后腐蚀产物行为的进一步研究提出了建议。

The corrosion product deposits in the primary circuit of PWR has an important impact on the safe and stable operation of the reactor. So far, a large number of studies about corrosion product behaviors have been investigated. However, considering the inconsistency of experimental conditions and the complexity of the formation, migration and deposition mechanism of corrosion products, no definite conclusions have been drawn in many research directions. In this paper, the influence factors affecting the behavior of corrosion products,such as water chemistry condition, heat flux and coolant flow rate are summarized. Appropriate water chemistry conditions, such as pH around 7.4 and dissolved H concentration between 25-50 cm^(3)/kg H_(2)O, will reduce the generation of corrosion products. In addition, the effects of the heat flux and the coolant flow rate on the deposition of corrosion products cannot be ignored. In addition, several representative codes for predicting the behaviors of corrosion product deposits and some models for predicting the influence of corrosion product deposits on the operation of reactors are introduced. Several constructive suggestions for the further research about corrosion product deposits are put forward.