This is a metallurgical question and needs a specialist answer. However it is to do with obtaining a material that will withstand the severe neutron flux at the fuel bundle periphery, and the conditions of temperature and pressure in the reactor. Zirconium is always alloyed with small percentages of some other metal, in nuclear applications. In the light water reactors, for fuel cladding and other in-core components, it has been alloyed with tin in US designs and with niobium in Russian designs, but at a lower percentage. AECL must have done some fundamental research and experimentation to arrive at a figure of 2.5 percent. Note that the pressure tubes even with this material will not last a full reactor life, and they can be replaced as part of 'refurbishment'. See the link below particularly question A.16. This series of FAQ may also answer some other queries on CANDU reactors.
Note that niobium is also frequently used in steel based alloys to improve its qualities.

D2O is the formula for heavy water.
The boiling point of heavy water is 101 degrees Celsius.
That would be 213.8 degrees Fahrenheit.

Heavy water (deuterium) functions as a moderator. It slows down fast neutrons released by fission reactions in order to allow the reaction to be sustained. Fast neutrons pass through the reactor before initiating another fission reaction.

the water goes up in vapor leaving behind the solids in the boiler.

That was the SF Hydro

yes

because it never stops running and people in other countries use the water for many of their needs... either way you look at it water is very helpful to everyone

The percentage of deuterated water (D2O and HDO) in normal water is approx. 0,015 %.

By an electrolytic isotope enrichment cascade. Enriched heavy water comes out the product output end of the cascade, depleted light water comes out the stripper end of the cascade.

Yes, at exactly the same levels as in ordinary water anywhere on earth: roughly 1 part per 6000.

Heavy water is water with some gases extracted.if you put it in a barrel and put the barrel in water the barrel would sink.Theonly reason Hitler wanted heavy water was because heavy water is used in atomic bombs.the only place he could get the heavy water was Norway. fortunately the Brit's blew up the only cargo ship carrying the heavy water back to Germany...some heavy water is lost in a lake somewhere in norway...lost in time forever.

Roughly $600 per liter.

The trash rack is used to catch (as its name implies) trash and other things, such as fish, before being sent into the impeller unit of the hydro station. It is a moving rack, with an automatic backwash that allows self cleaning, and non-killing removal of fish.

The coefficient of thermal expansion depends on the temperature and pressure. It a pressure of 1 atmosphere the coefficient of thermal expansion are:at 4 deg C : –0.1321

at 20 deg C : 0.1212

at 50 deg C : 0.4280

at 100 deg C: 0.7454.

heavy water can be seperated by exchanging the D20 between ordinary water and hydrogen sulphide at different temperatures

Heavy water has also been called deuterium oxide, D2O.

Roughly 630mg

Zerlina.

Pure heavy water is practically not conductive.

Heavy water is defined as water made with either Deuterium (Hydrogen with 1 neutron) or Tritium (Hydrogen with 2 neutrons).

Deuterium is stable.

Tritium is radioactive, but is of very low energy. However, it has been used successfully to make things like EXIT lights glow.

There is no particular potential energy gradient that could be utilized between "normal" water and "heavy" water.

Deuterium or Tritium may eventually be used in Nuclear Fusion.

Fusion Bombs (Hydrogen Bombs) have been made for decades. However, it has been a daunting task to control the nuclear fusion to produce usable energy.

There is ongoing research with building Nuclear Fusion Powerplants, especially in the European Union.

See the related links section below for links to more related information on WikiPedia.

Heavy water has the advantage of being a good moderator and of absorbing fewer neutrons than does light water, so that natural (unenriched) uranium can be used. Light water demands enriched uranium, around 4 to 5 percent U-235. So you can make a choice: use heavy water which is expensive to produce, or use light water and expensive enriched uranium.

You can see the different approach between the US and Canada. In the US there was experience of enrichment from the WW2 Manhattan project, in Canada there was no such experience but they had cheap hydro power to use to produce heavy water, so developed the Candu type of reactor.

A WWII commando operation

Heavy water is used in making hydrogen bombs.