The Results obtained from the 20 years of the "Monju" plant data, 3; Purification efficiency of secondary sodium purification system cold trap

Sato, Takeshi; Okawachi, Yasushi ; Nakamura, Yoshihide; Sawazaki, Hiromasa

In the Monju, before expanding accident in the unlikely event of a water leak from the steam generator tubes, capturing the hydrogen concentration changes in the secondary sodium, it is important to early detect the corresponding water leak. Its detection sensitivity, the amount of hydrogen diffused from the water side to the secondary sodium in through the heat exchanger tube during normal operation, depends on the performance of the cold trap to remove it. So, this time was carried out to confirm the purification efficiency derived by using the operating data of the actual machine of purification efficiency and about 20 years was expected in the design of the secondary sodium purification system cold trap.