The Design Defect of the Blanket Gas System of Moderator and Its Improvement
As an auxiliary system of the main moderator system,the blanket gas system of moderator plays an important role.However,due to a defect in system design,the water-ring compressor could not properly drain the leakage of the mechanical leak-off connection during the normal operation of the system,leading to the accumulation of high-tritium heavy water in the drainage pipeline and ultimately leaking from the backup mechanical seal into the external envi-ronment.After the unit was put into normal commercial operation,this defect was gradually exposed,a series of analysis and inspection were carried out,and the design defect in the blanket gas system of moderator was ultimately located.Through a series of measures such as changing the drainage pipeline of the compressor and dismantling the check valve of the pipeline,and the design defect in the system has been completely solved after three improvements and adjustments.
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