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post #451 of 2836
im leaving for mars, anyone coming with?
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post #452 of 2836
Even if the fuel plates 100% meltdown, it's not going to be like Chernobyl.

These reactors use U-235 for fuel, a slow, thermal fission fuel. It does not explode like U-238, a fast fission fuel. U-235 absorbs a slow, thermal neutron, then fissions. It needs water to slow down fast neutrons (moderator) into thermal neutrons. Fast neutrons bounce off U-235 nucleus like a ping-pong ball hitting a bowling ball.

Now when I say melt down, that means each alloyed fuel plate blisters and allows fission fragments to enter the cooling water. This contaminated water can be poisoned with boron-tetraflouride pellets to keep further fission from occurring. The shutdown-cooldown process pretty rapid. Natural decay of these fission products is logarithmic. Example: a navy reactor compartment is safe to enter after just a few hours. I would expect these reactors to have safe enough radiation levels to allow repairs after about a week. The longest lived byproduct being cobalt-60.
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post #453 of 2836
Thread Starter 
Quote:
Originally Posted by damric View Post
Even if the fuel plates 100% meltdown, it's not going to be like Chernobyl.

These reactors use U-235 for fuel, a slow, thermal fission fuel. It does not explode like U-238, a fast fission fuel. U-235 absorbs a slow, thermal neutron, then fissions. It needs water to slow down fast neutrons (moderator) into thermal neutrons. Fast neutrons bounce off U-235 nucleus like a ping-pong ball hitting a bowling ball.

Now when I say melt down, that means each alloyed fuel plate blisters and allows fission fragments to enter the cooling water. This contaminated water can be poisoned with boron-tetraflouride pellets to keep further fission from occurring. The shutdown-cooldown process pretty rapid. Natural decay of these fission products is logarithmic. Example: a navy reactor compartment is safe to enter after just a few hours. I would expect these reactors to have safe enough radiation levels to allow repairs after about a week. The longest lived byproduct being cobalt-60.
Thank you for your contributions to the thread damric. Good to have someone who knows what they are talking about and can dispel peoples fears and irrational claims.
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post #454 of 2836
Quote:
Originally Posted by damric View Post
Even if the fuel plates 100% meltdown, it's not going to be like Chernobyl.

These reactors use U-235 for fuel, a slow, thermal fission fuel. It does not explode like U-238, a fast fission fuel. U-235 absorbs a slow, thermal neutron, then fissions. It needs water to slow down fast neutrons (moderator) into thermal neutrons. Fast neutrons bounce off U-235 nucleus like a ping-pong ball hitting a bowling ball.

Now when I say melt down, that means each alloyed fuel plate blisters and allows fission fragments to enter the cooling water. This contaminated water can be poisoned with boron-tetraflouride pellets to keep further fission from occurring. The shutdown-cooldown process pretty rapid. Natural decay of these fission products is logarithmic. Example: a navy reactor compartment is safe to enter after just a few hours. I would expect these reactors to have safe enough radiation levels to allow repairs after about a week. The longest lived byproduct being cobalt-60.
won't the water break down at that heat then the hydroyen will explode and radio active particals will escape?
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post #455 of 2836
Quote:
Originally Posted by E-Peen View Post
I like how when things happen like this everyone automatically becomes a scientist.
I was just about about to post this. It's quite funny to read people who know nothing telling us that if there is one meltdown we will all have to evacuate to space for 50 years, or we'll die.

Although, damric knows what he is talking about, and I thank him for his informational and helpful posts.
    
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post #456 of 2836
Quote:
Originally Posted by jy360 View Post
won't the water break down at that heat then the hydroyen will explode and radio active particals will escape?
The bolded part has supposedly already happened, the latter hasn't since the containment vessel is still intact.
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post #457 of 2836
Quote:
Originally Posted by damric View Post
Even if the fuel plates 100% meltdown, it's not going to be like Chernobyl.

These reactors use U-235 for fuel, a slow, thermal fission fuel. It does not explode like U-238, a fast fission fuel. U-235 absorbs a slow, thermal neutron, then fissions. It needs water to slow down fast neutrons (moderator) into thermal neutrons. Fast neutrons bounce off U-235 nucleus like a ping-pong ball hitting a bowling ball.

Now when I say melt down, that means each alloyed fuel plate blisters and allows fission fragments to enter the cooling water. This contaminated water can be poisoned with boron-tetraflouride pellets to keep further fission from occurring. The shutdown-cooldown process pretty rapid. Natural decay of these fission products is logarithmic. Example: a navy reactor compartment is safe to enter after just a few hours. I would expect these reactors to have safe enough radiation levels to allow repairs after about a week. The longest lived byproduct being cobalt-60.
Good post, you always seem to have good information when it comes to nuclear energy.
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post #458 of 2836
Quote:
Originally Posted by SmokinWaffle View Post
I was just about about to post this. It's quite funny to read people who know nothing telling us that if there is one meltdown we will all have to evacuate to space for 50 years, or we'll die.

Although, damric knows what he is talking about, and I thank him for his informational and helpful posts.

+1 to that brother! Accurate info is good info.
post #459 of 2836
The radioactive gases are quite short-lived. The worst one is Nitrogen (I think it is N-18), but it literally decays in minutes. The hydrogen is so chemically reactive (and has such a small neutron absorption rate) that it would never escape the primary coolant. Hydrogen gas is really only a problem during a continuous control rod withdrawal casualty (don't worry it's too late for this to happen), where control rods withdrawal so fast that hydrogen explodes.

I only know all this crap because it was crammed down my throat at gunpoint at Navy Nuclear Power School
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post #460 of 2836
Thread Starter 
Quote:
Originally Posted by damric View Post
The radioactive gases are quite short-lived. The worst one is Nitrogen (I think it is N-18), but it literally decays in minutes. The hydrogen is so chemically reactive (and has such a small neutron absorption rate) that it would never escape the primary coolant. Hydrogen gas is really only a problem during a continuous control rod withdrawal casualty (don't worry it's too late for this to happen), where control rods withdrawal so fast that hydrogen explodes.

I only know all this crap because it was crammed down my throat at gunpoint at Navy Nuclear Power School
Have any thoughts on the earlier explosion that largely destroyed the building surrounding Reactor One?
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