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  2. Light-water reactor - Wikipedia

    en.wikipedia.org/wiki/Light-water_reactor

    The light-water reactor (LWR) is a type of thermal-neutron reactor that uses normal water, as opposed to heavy water, as both its coolant and neutron moderator; furthermore a solid form of fissile elements is used as fuel. Thermal-neutron reactors are the most common type of nuclear reactor, and light-water reactors are the most common type of ...

  3. Heavy water - Wikipedia

    en.wikipedia.org/wiki/Heavy_water

    Heavy water is less dissociated than light water at given temperature, and the true concentration of D + ions is less than H + ions would be for light water at the same temperature. The same is true of OD − vs. OH − ions. For heavy water Kw D 2 O (25.0 °C) = 1.35 × 10 −15, and [D + ] must equal [OD − ] for neutral water

  4. Pressurized heavy-water reactor - Wikipedia

    en.wikipedia.org/.../Pressurized_heavy-water_reactor

    The heavy water coolant is kept under pressure to avoid boiling, allowing it to reach higher temperature (mostly) without forming steam bubbles, exactly as for a pressurized water reactor (PWR). While heavy water is very expensive to isolate from ordinary water (often referred to as light water in contrast to heavy water), its low absorption of ...

  5. Neutron moderator - Wikipedia

    en.wikipedia.org/wiki/Neutron_moderator

    Water (sometimes called "light water" in this context) is the most commonly used moderator (roughly 75% of the world's reactors). Solid graphite (20% of reactors) and heavy water (5% of reactors) are the main alternatives. [1] Beryllium has also been used in some experimental types, and hydrocarbons have been suggested as another possibility.

  6. Pressurized water reactor - Wikipedia

    en.wikipedia.org/wiki/Pressurized_water_reactor

    A pressurized water reactor (PWR) is a type of light-water nuclear reactor. PWRs constitute the large majority of the world's nuclear power plants (with notable exceptions being the UK, Japan, India and Canada). In a PWR, water is used both as a neutron moderator and as coolant fluid for the reactor core.

  7. Supercritical water reactor - Wikipedia

    en.wikipedia.org/wiki/Supercritical_water_reactor

    The SCWR operates at supercritical pressure. The reactor outlet coolant is supercritical water.Light water is used as a neutron moderator and coolant. Above the critical point, steam and liquid become the same density and are indistinguishable, eliminating the need for pressurizers and steam generators (), or jet/recirculation pumps, steam separators and dryers ().

  8. Open-pool Australian lightwater reactor - Wikipedia

    en.wikipedia.org/wiki/Open-pool_Australian_light...

    The reactor core consists of 16 low-enriched plate-type fuel assemblies and is located under 13 metres (43 ft) of water in an open pool. Light water (normal H 2 O) is used as the coolant and moderator while heavy water (D 2 O) is used as the neutron reflector. The purpose of the neutron reflector is to improve neutron economy in the reactor ...

  9. Deuterium-depleted water - Wikipedia

    en.wikipedia.org/wiki/Deuterium-depleted_water

    Deuterium-depleted water (DDW) is water which has a lower concentration of deuterium than occurs naturally at sea level on Earth. DDW is sometimes known as light water or protium water, although "light water" has long referred to ordinary water, specifically in nuclear reactors.