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이선기(S. K. Lee),이상국(S. G. Lee),박성근(S. K. Park),노영진(Y. J. Rho) 한국동력기계공학회 2008 한국동력기계공학회 학술대회 논문집 Vol.2008 No.11
The CANDU type reactors require on power refuelling by the two remotely controlled fuelling machines. The refuelling operation is carried out along the coolant direction by the drag force of fuel bundles for most channels. However, for about 30% of channels the coolant flow is not sufficiently high enough to carry fuel bundles to the downstream. Therefore, a device, FARE (Flow Assist Ram Extension) device, is used to create an additional drag force to push the fuel bundles along the coolant flow. The FARE device has been causing the channel flow low phenomena of channels due to more than excessive blockage of coolant flow. The flow rate change for the channels is monitored on line for the coolant flow blockage of the channels. This has initiated the investigation of the FAKE device behavior and the cause and remedy for the problem. The analysis revealed that the channel flow low occurs as the insertion of the FARE device into the active core flow and disappears as the removal of the FARE device from it. In order to eliminate the channel flow low phenomena, flow resistance by the FARE device should be reduced. The analysis has revealed that a too much relaxation of flow resistance would make the FARE device unable to push the fuel bundle string, and a too little relaxation would make the FARE device unable to eliminate the channel flow low phenomena. Suggested design changes include more flow holes in the tube.