| 摘要 |
PROBLEM TO BE SOLVED: To reduce the quantity of a radioactive nuclide in an oxide film generated on the pipe inner surface in a residual heat removal system. SOLUTION: A hydrazine injection device is equipped with a hydrazine adjustment tank 23a and a hydrazine injection pipe 20. A hydrazine injection pump 25 and a flow adjustment valve 22a are provided on the hydrazine injection system pipe 20. The hydrazine injection pipe 20 is connected to a residual heat removal system pipe 4 in the residual heat removal system 12. A control rod is inserted into the core to reduce a reactor output, and when the reactor water temperature is lowered to about 150°C, operation of the residual heat removal system 12 is started. A part of reactor water in recirculation system pipe 2 is introduced into the residual heat removal system pipe 4. The flow adjustment valve 22a is opened, and the hydrazine injection pump 25 is driven. Hydrazine in the hydrazine adjustment tank 23a is added to the reactor water flowing in the residual heat removal system pipe 4 through the hydrazine injection pipe 20. COPYRIGHT: (C)2006,JPO&NCIPI
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