Nuclear steam generator
First Claim
Patent Images
1. A nuclear steam generator having an outer vessel surrounding the water to be evaporated, the water having a natural water level;
- a heating tube bundle located within said vessel below the water level;
a blowdown line located within said vessel and substantially below the water level at a low elevation;
a blowdown pump;
a first valve;
a first conduit connecting said blowdown line to said first valve;
a second conduit connecting said first valve to said blowndown pump;
a second valve;
a third conduit connecting said blowdown pump to said second valve;
a fourth conduit connecting said second valve to said vessel at a first upper elevation;
a third valve;
a fifth conduit containing said third valve connecting said second and fourth conduits;
a fourth valve;
a sixth conduit connecting said first and third conduits and containing said fourth valve;
a blowdown filter located in one of said first, second, third, or fourth conduits.
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Abstract
A nuclear steam generator has a blowdown pump arranged to pump water from the blowdown lines through a filter for return to the steam generator. The piping is arranged so that the same pump may operate to reverse the direction of pumping through the blowdown line, whereby reverse circulation may be established during wet lay up of the steam generator. A blower is arranged to withdraw nitrogen from an upper elevation in the steam generator and injected into the blowdown line in combination with the pumped reverse circulation during wet lay up.
12 Citations
7 Claims
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1. A nuclear steam generator having an outer vessel surrounding the water to be evaporated, the water having a natural water level;
- a heating tube bundle located within said vessel below the water level;
a blowdown line located within said vessel and substantially below the water level at a low elevation;
a blowdown pump;
a first valve;
a first conduit connecting said blowdown line to said first valve;
a second conduit connecting said first valve to said blowndown pump;
a second valve;
a third conduit connecting said blowdown pump to said second valve;
a fourth conduit connecting said second valve to said vessel at a first upper elevation;
a third valve;
a fifth conduit containing said third valve connecting said second and fourth conduits;
a fourth valve;
a sixth conduit connecting said first and third conduits and containing said fourth valve;
a blowdown filter located in one of said first, second, third, or fourth conduits. - View Dependent Claims (2, 3)
- a heating tube bundle located within said vessel below the water level;
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4. A method of operating a nuclear steam generator during wet lay up, said steam generator having water therein to a predetermined level and an inert gas above the water level, comprising:
- withdrawing boiler water from said steam generator at an upper elevation;
pumping the withdrawn water into said steam generator at a lower elevation;
simultaneously withdrawing an inert gas from said steam generator at an elevation above the water level therein and injecting the gas into the water at a lower elevation. - View Dependent Claims (5, 6, 7)
- withdrawing boiler water from said steam generator at an upper elevation;
Specification