The present invention relates to a passive nitrogen injecting device for a nuclear reactor coolant pump, the device comprising: a nitrogen supply unit for supplying nitrogen; a pressure control valve for controlling the supply of nitrogen from the nitrogen supply unit according to pressure; an accumulator for filling the nitrogen supplied through the pressure control valve at a set pressure, and supplying the filled nitrogen in the event that an accident involving coolant loss occurs; and an isolation valve for controlling the supply of the nitrogen from the accumulator into a seal housing of a nuclear reactor coolant pump. The present invention uses an accumulator so as to be able to supply nitrogen by using the pressure in the accumulator without the supply of external power in the event of an accident involving coolant loss, and therefore has the effect of being able to improve safety.

Devices and systems for testing nuclear components are disclosed. An outer shell and inner shell containing a nuclear test component are fed with a test gas which is heated by nuclear reactions. A second gas is fed into the gas outlet to cool the test gas.

Methods, systems, and reactors for chemical vapor infiltration reaction endpoint determination. A system includes a user interface device to enter an inert gas quantity inputted to a reactor, an output device, a hydrogen sensor configured to generate a hydrogen concentration value, a total density sensor configured to generate a total density value, and a processor coupled to the user interface device, the output device, the hydrogen sensor, and the total density sensor. The processor receives the inert gas quantity, the hydrogen concentration value, and the total density value, determines a silicon absorption value based on the received values, generates a signal in response to the silicon absorption value being at or above a predetermined threshold value, and sends the generated signal to the output device. The output device outputs an indication in response to receiving the signal.

Methods, systems, and reactors for chemical vapor infiltration reaction endpoint determination. A system includes a user interface device to enter an inert gas quantity inputted to a reactor, an output device, a hydrogen sensor configured to generate a hydrogen concentration value, a total density sensor configured to generate a total density value, and a processor coupled to the user interface device, the output device, the hydrogen sensor, and the total density sensor. The processor receives the inert gas quantity, the hydrogen concentration value, and the total density value, determines a silicon absorption value based on the received values, generates a signal in response to the silicon absorption value being at or above a predetermined threshold value, and sends the generated signal to the output device. The output device outputs an indication in response to receiving the signal.

Devices and systems for testing nuclear components are disclosed. An outer shell and inner shell containing a nuclear test component are fed with a test gas which is heated by nuclear reactions. A second gas is fed into the gas outlet to cool the test gas.

Devices and systems for testing nuclear components are disclosed. An outer shell and inner shell containing a nuclear test component are fed with a test gas which is heated by nuclear reactions. A second gas is fed into the gas outlet to cool the test gas.