Abstract: A high pressure safety injection tank (HPSIT) system includes one safety injection tank (HIT) which replaces a core makeup tank (CMT) and a low pressure (approximately 4.3 Mpa or below) safety injection tank (SIT) and which can shift to and operate on a high pressure (approximately 17 Mpa) operation mode, to enable injection of emergency core coolant into a reactor system both under low pressure (approximately 4.3 Mpa or below) and high pressure (approximately 17 Mpa).

Abstract: A high pressure safety injection tank (HPSIT) system includes one safety injection tank (HIT) which replaces a core makeup tank (CMT) and a low pressure (approximately 4.3 Mpa or below) safety injection tank (SIT) and which can shift to and operate on a high pressure (approximately 17 Mpa) operation mode, to enable injection of emergency core coolant into a reactor system both under low pressure (approximately 4.3 Mpa or below) and high pressure (approximately 17 Mpa).

Abstract: An average bidirectional flow tube, including a body having two side plates and upper and lower plates, a partition plate installed to be perpendicular to the side plates of the body so that front and rear ends of the tube are separated from each other, and two pairs of pressure impulse lines installed at front and rear positions of the partition plate. The upper and lower plates of the body each have a curvature to be in contact with an inner surface of a pipe in which the average bidirectional flow tube is installed, and each of the pressure impulse lines is installed to communicate with an interior of the pipe. Although a two-phase flow occurs in the pipe or the flow of the fluid flowing in the pipe is changed, an average flow rate of a fluid can be measured. Particularly, it is easy to measure an average flow rate of the fluid when the fluid flows at a low speed. Further, even when sudden pressure reduction occurs in the pipe, an additional cooling device is not required.

Abstract: An average bidirectional flow tube, including a body having two side plates and upper and lower plates, a partition plate installed to be perpendicular to the side plates of the body so that front and rear ends of the tube are separated from each other, and two pairs of pressure impulse lines installed at front and rear positions of the partition plate. The upper and lower plates of the body each have a curvature to be in contact with an inner surface of a pipe in which the average bidirectional flow tube is installed, and each of the pressure impulse lines is installed to communicate with an interior of the pipe. Although a two-phase flow occurs in the pipe or the flow of the fluid flowing in the pipe is changed, an average flow rate of a fluid can be measured. Particularly, it is easy to measure an average flow rate of the fluid when the fluid flows at a low speed. Further, even when sudden pressure reduction occurs in the pipe, an additional cooling device is not required.