Question: It's 2016, but for some reason, the Cold War never ended. You've been inspired by your (for some inexplicable reason) favorite movie, Indiana Jones 4, to start a new business: building refrigerators. However, the market is so saturated that in order to distinguish yourself with a nice marketing campaign, you decide to make them **NUKEPROOF!** 

The refrigerator should be:

1. Usable as a real refrigerator would be.
2. No bigger than standard double door refrigerator, so no room-sized walk-in refrigerator. Though, you *can* add some additional size for additional armor, for example, in **reasonable** margins, so nothing like 10 meters of iron from one side.
3. Protect one person from up to 1.2 megatonnes of a TNT nuke at a minimum distance of 2 km from the explosion.

How are you going to design it and what materials are you going to use?

Answer: 
While the it's-not-possible answers are correct for the question you intended to ask lets try another approach:

For colder climates it's technically possible (but economic insanity) to build a refrigerator that contains no cooling element at all. Lets make the Green Fridge (tm):

No ozone-destroying Freon!
No toxic ammonia!
No risk of incomplete combustion of the propane causing CO poisoning!
Uses far less electricity than a normal refrigerator!
You'll be safe against anything less than a direct hit by a nuke!

Dig a big, deep hole. In the hole we put a large, very well insulated, very strong walk-in cooled space. Note that this will be at at least the sub-basement level, ideally it would be accessed by stairs or a ramp going down so as to minimize the air spill when the door is opened. There are two holes in the ceiling of the cooled space.

Above the cooled space, separated by the insulation layer is a large concrete box. One of the holes from the ceiling connects to a U-shaped pipe (so the opening points down) in one corner of the box, the other to a pipe in the opposite corner that connects to the top, again with a U on the end. There is a large bimetallic thermometer on the first pipe that opens or closes a baffle in the pipe. There also must be a drain for the box.

A pipe heading up goes into the third corner of the box, the box is filled with large gravel, a pipe is added in the last corner and it's roofed over and likewise very well insulated. Pipe #3 is insulated and extended to a surface air intake. There is a fan in this pipe (the only powered component in the whole thing!) that turns on when the outside air is colder than the air in the box. The final pipe vents back to the surface, ideally after running a bit through the ground first to dump its cold into the soil.

Now the whole thing is covered over except for the vent pipes and however you plan to get to your storage space. You want some feet of dirt and then a moisture barrier layer and more dirt.

Assuming you sized it big enough and the winters are cold enough this will work--you get a cold space for no more operating costs than running a fan in the winter.

Note that so long as you are dealing with an airburst this should survive anything, although escape might be problematic. You have basically perfect radiation shielding, the only modification you'll need to make to ride out the nuke attack is to add a supply of compressed air to use while the firestorm burns overhead.

(Note: In practice you would put the cold space on the bottom and use a fan to bring up the air, I was going for ultimate green. Also, the thermal mass needed is simply too great to be worth it. However, a related idea is in actual use by some people: Bury your house as indicated, run the air feeds through enough ground and you can climate-control your house with nothing but a fan. While the total heating/cooling needed is a lot greater the outside air will be in the right direction far more often and the natural ground temperature isn't too far below what you want for your house anyway.)
Add an asterisk to "Protect":

> 
> Protect\* one person from up to 1.2 megatonnes of a TNT nuke at a minimum distance of 2 km from the explosion.
> 
> 
> 

\* Protect: the explosion will not kill you and the nuke will leave no lasting ill effects. Protection may also apply to others near fridge.

Simply make a normal fridge with small extra box with a piece of string hanging out. "Nuke conversion"-kits also sold separately.

In the event of an imminent nearby nuclear explosion simply enter the fridge, pull the string and the 40 kg of TNT in the box will explode, preventing the nuclear blast from killing you.

Double your money back if the nuke kills you, upon personal application.