Primary Water Chemistry Guidelines for Japanese PWR Plants

摘要

After 40 years of PWR plant operations in Japan, the sustainable development of water chemistry technologies has led to the highest material and fuel reliability performance history for maintaining PWR reactors in the world in addition to an excellent dose rate reduction. Although reasonable control and diagnostic parameters have been utilized by each PWR owner, it has been recognized that specific values have not been shared between everyone involved. To ensure the reliability of PWR operation and maintenance, relevant members of the Atomic Energy Society of Japan (AESJ) decided to establish guidelines for water chemistry. The guidelines provide strategies to improve material and fuel reliability performance as well as to reduce dose rates. Specifically, the guidelines provide reasonable "action levels" for control parameters and suggest responses when exceeding these levels. Good practices for operational conditions are also discussed with reference to long-term experience. This paper presents a framework of the preliminary guidelines for PWR primary water chemistry. It is expected that the guidelines will be helpful as an introduction to safety and reliability during domestic PWR plant operations.