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As the reactors appear to have holes around the bottom, the water dissolved the water-soluble fission products, which then accumulated in the basement of the turbine building (see the adjacent diagram) through any leaks from the water-injected reactor buildings. Since the accumulated radioactive water was a risk, TEPCO tried to transfer it.
Much like a straw in a glass draws liquid, the pump draws liquid (including free-product) and soil gas up the tube in the same process stream. Pumping lifts LNAPLs, such as oil, off the top of the water table and from the capillary fringe (i.e., an area just above the saturated zone, where water is held in place by capillary forces).
Depending on the concrete condition and contamination, the cleaning can range from simple high pressure jet water cleaning (200 bar) up to real hydro-demolition (2000 bars). One method to ensure sound concrete is exposed is to verify that the surface pH is superior to 10. As for any concrete repair, the state-of-the-art rules must be followed.
A block and tackle is fitted to the hook on the steel frame at the end of the concrete platform to pull the screens up for cleaning. The intake draws water from the river and through the pumping station by a series of valve controlled pipes power by electric motors housed in the basement level from where it is pumped via two mains to the water ...
A lift station is a sewer sump that lifts accumulated sewage to a higher elevation. They may also be used to prime an inverted siphon used to cross underneath rivers or other obstructions. The pump may discharge to another gravity sewer or directly to a treatment plant. [6]
It used uranium-235 as fuel and was cooled by water. [3] The reactor's chamber, placed on the lower floor of the facility, was 15 ft (4.6 m) high, 20 ft (6.1 m) long, and 19 ft (5.8 m) wide. [ 4 ] [ 5 ] During its 27-year lifespan, the reactor operated for the equivalent of 140 days, running for some days at half power and for as little as 10 ...
Map of the NAWAPA project (right), as compared with the GRAND, a continental water management scheme of similar scale. The North American Water and Power Alliance (NAWPA or NAWAPA; also referred to as NAWAPTA after the proposed governing body, the North American Water and Power Treaty Authority) was a proposed continental water management scheme conceived in the 1950s by the US Army Corps of ...
A dry well or drywell is an underground structure that disposes of unwanted water, most commonly surface runoff and stormwater, in some cases greywater or water used in a groundwater heat pump. It is a gravity-fed , vertical underground system that can capture surface water from impervious surfaces , then store and gradually infiltrate the ...
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