Chemical injection system and chemical delivery process/method of injecting into an operating power reactor

An injection system for injecting a concentrated chemical solution into a nuclear power reactor while the reactor is operating at full power and temperature to treat the reactor's internal surfaces intergranular stress corrosion cracking is mitigated, the injection system comprising:

• at least one tank that stores the concentrated chemical solution,
• a first injection pump that pumps the concentrated chemical solution from at least one tank and that meters the concentrated chemical solution's flow into a transit tube connected to the power reactor's primary or auxiliary system taps, in particular, the feedwater system downstream of the heaters/heat-ex,
• at least one load cell that determines reductions in the weight of the concentrated chemical solution stored in the at least one tank in response to the solution being pumped from the at least one tank by the first injection pump,
• a second injection pump that pumps DI water from a source of said water and that meters the DI water's flow into the transit tube to dilute the concentrated chemical solution in the transit tube, so that the residence time of the chemical solution within the transit tube before delivery of the solution to the reactor is reduced,
• a plurality of valves that connect the first and second pumps to the transit tube, so that the diluted chemical solution is feed to the power reactor's internals during normal operating condition of the power reactor,
• a logic controller that controls the first and second injection pumps and the plurality of valves that connect the first and second injection pumps to the common line, to control the injection rate of the diluted chemical solution into the power reactor's injection taps, and
• a recirculation and storage system that stores and circulates a buffer solution through the first injection pump to flush the first injection pump's wetted moving parts.