Patent ID: 8040997

Claim:
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; and a 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, wherein the 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, and the 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.