Patent Number: 
Section: claims

1. A pH adjusting system comprising:an internal water storage tank that is disposed in a reactor container, which stores a nuclear reactor, and is capable of storing cooling water;a spraying unit that sprays the cooling water stored in the internal water storage tank into an inside of the reactor container; anda pH adjusting apparatus that is disposed above the internal water storage tank and below the spraying unit, the pH adjusting apparatus including a container that has an opened top side and stores a pH adjuster, and an overflow pipe, whereinthe overflow pipe is formed in a reversed U shape, an end of the overflow pipe is disposed in a lower portion of the container,a vent pipe with an opened end is provided to a top portion of the overflow pipe, andthe pH adjusting apparatus causes a pH-adjusted solution generated by dissolving or mixing the pH adjuster to flow out via the overflow pipe to the internal water storage tank below the pH adjusting apparatus. 2. The pH adjusting system according to claim 1, wherein the pH adjuster is prepared in a powder state. 3. The pH adjusting system according to claim 1, further comprising a solvent injecting unit that is capable of injecting a solvent for dissolving or diluting the pH adjuster into the pH adjusting apparatus, and further comprising an external water storage tank that is provided on an outside of the reactor container and is capable of storing the solvent, wherein the solvent injecting unit injects the solvent, which is stored in the external water storage tank, into the pH adjusting apparatus. 4. The pH adjusting system according to claim 1, whereinthe pH adjusting apparatus includes a basket containing the pH adjuster, and a basket housing container that houses the basket, andan inlet through which the solvent injected from the spraying unit flows in and an outlet from which the pH-adjusted solution generated by dissolving or mixing the pH adjuster in the solvent flows out to the internal water storage tank are formed in the basket housing container.