Patent Number: 
Section: claims

1. An assembly for injecting water containing a neutron-absorbing element in order to cool a nuclear reactor core of a nuclear reactor in a crisis situation, the assembly comprising:a mobile structure, the mobile structure being configured to be transported to the nuclear reactor during the crisis situation, the mobile structure including a main pipe, the main pipe including a first end connectable to a water supply, the main pipe including a second end connectable to a circuit connected to a primary circuit of the nuclear reactor, the main pipe including, between the first and second ends, each of a pump, an injector and a first mixer;the pump being configured to cause water received from the water supply to flow in the main pipe,the injector being configured to continuously inject a neutron-absorbing element in powder form into the water in the main pipe,the first mixer being configured to mix and dissolve the injected powder in the water,the mobile structure including a controller, the controller being configured to control a flow rate of the water in the main pipe and an injection rate of the powder into the water by the injector. 2. The assembly as recited in claim 1 wherein the main pipe further includes, between the pump and the injector, a water heater regulated by the controller. 3. The assembly as recited in claim 1 wherein the mobile structure further includes a secondary pipe having a first end connectable to a water supply and a second end connectable to the main pipe between the first mixer and the second end of the main pipe, the secondary pipe including a pump between the first and second ends thereof. 4. The assembly as recited in claim 3 wherein the main pipe includes, between the second end of the secondary pipe and the second end of the main pipe, a second mixer configured for mixing the powdered neutron-absorbing element and the water in the secondary pipe. 5. The assembly as recited in claim 4 wherein the second mixer comprises a mechanical mixer. 6. The assembly as recited in claim 1 wherein the first mixer comprises a mechanical mixer and ultrasound inducers controlled by the controller. 7. The assembly as recited in claim 1 wherein the controller is configured to operate to control operation of the first mixer.