Patent Number: 054992788
Section: claims

1. A method for raising the water level in a condenser pool having a condenser at least partly submerged in water when the water level is at a predetermined elevation, comprising the steps of: anchoring a structure in the condenser pool so that at least a portion of said structure is submerged in water, said structure being suitable for retaining a gas at an elevation below a predetermined water level in said condenser pool, and  injecting a volume of gas into said gas retaining structure, whereby an equal volume of water in said condenser pool is displaced from an elevation below said predetermined elevation to an elevation above said predetermined elevation without adding water into the condenser pool.  injecting gas into a volume which is submerged in the water in the condenser pool; and  retaining the injected gas in said volume,  whereby an equal volume of water in said condenser pool is displaced from an elevation below said predetermined elevation to an elevation above said predetermined elevation without adding water into the condenser pool. 2. The method as defined in claim 1, wherein said volume of gas is injected from an accumulator containing a poison solution and pressurized nitrogen gas. 3. A method for raising the water level in a condenser pool of a boiling water reactor having a condenser at least partly submerged in water when the water level in the condenser pool is at a predetermined elevation, comprising the steps of: 4. The method as defined in claim 3, wherein the gas is injected from an accumulator containing a poison solution and pressurized nitrogen gas.