Introduction:

Hey, so I decided to make a vault, hope you like it. It ain't based on anything from the series, it's using one of the "unused" vault numbers.

Lore:

Vault 76 was a control vault built by Vault-Tec before the great war. It had a main, functional blast-door which could withstand a direct strike from a nuke, with only 2% chance of the vault being damaged. Being a control vault it was set to open twenty years after the Great War. When it was to open it would have been tasked with repopulating the wasteland. There were 1,000 residents in the Vault when it was sealed. (The vault in game is not to scale)

-non-canon-

This vault didn't suffer from the cry wolf effect like many other vaults and when the bombs dropped it was fully populated.
After the Vault was sealed the overseer got people working, the farms were producing food, the Vault-Tec Radio was playing music and the casino business was booming. The people on the inside could feel the ground shake as the bombs hit the surrounding landscape. They tore away at the dirt but the radiation never got into the Vault. The bombing lasted only a few hours but after that it was completely silent.

For fifteen years the people worked away without any hardships and then they heard a knocking. There was someone on the outside trying to get in. The Vault was split on whether or not to let this person in, could they have radiation posioning? Could they be a communist spy trying to get in? They didn't know and eventually the people settled on keeping the doors shut. Finally, after twenty years of living in the vault the doors were opened, first security guards went out, they came across the bones of a dead man, the same person who was knocking at the door five years ago.

When they emerged onto the surface there was a lot of surface radiation. The scientists in the vault concluded that the vault would need to stay closed for another ten years before the radiation would have cleared and the population could move out onto the surface.

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Features:

This vault is fully operational with all the amenities to sustain life for over one hundred years.

- Sealed Enterance:
The sealed enterance means that the vault is protected from radiation, bombs and raiders a like. It keeps the bad things out but also the people in. After five years it is set to open again.

- Backup Generator:
It is known that generators fail or need repair so VaultTec supplied a backup generator for ready use if the power used goes above a certain extent or the main generators fail.

- Two Main Generators:
Two main generators power the vault, they run on atomic power. They had the capacity to run for over 200 years before they run out of fuel and then they would use geothermal energy to power the Vault. It was planned that the inhabitants would have populated the surface before this occurs.

- Main Atrium:
Due to being underground many people might feel enclosed or squashed but the atrium gets rid of that feeling. With a high ceiling and big expansive area it makes you feel some space. This is the general meeting area of the vault.

- VaultTec Radio:
The VaultTec Radio with all the news from around the Vault and sounds from Dean Domino and other popular artists. It can be played through your PipBoy 3000.

- Jericho's Supplies:
Jericho, the local salesman has set up shop in the atrium with his own shop. Suppling you with ducktape, food and all your daily needs. He doesn't accept currency but he gets favours off those who take supplies.

- R&T Research:
Two young budding scientists set up there research place just off the atrium where they look into conditions and problems in the Vault and how to fix them. At the moment they are investigating the G.E.C.K [Garden of Eden Creation Kit] to see if they can reverse engineer it.

- Farms:
What would the vault come to if the food supply ran out, and people can't eat tinned food forever. This farm supplies melons, wheat, potatoes, carrots and pumpkins which are all either freeze-dried and stored for later use or eaten by the Vault Dwellers.

- Medic Room:
In preperation for going outside a medic room was built near the enterance where sick and injured people could be treated away from the main population. It has never had to have been used but when the Vault reopens in twenty years it might have to be.

- Doctors Office:
The vault has it's own Doctors office. The doctor functions as a GP who is versed in most sections of medical health. Also accompanying the GP is an assistant in case of an untimely death. The office also has an operating table for pregnancy and emergency operations.

- Water Purifier:
Without water people couldn't survive, this purifier uses the waste water of the Vault and refilters it dispersing it back to the people. It also uses an underground river if the pipes run dry or a lot of water is being used. This water is filtered using the G.E.C.K.

- Armoury:
In preperation for going out into the wastes VaultTec supplied the vault with four suits of power armour, holotapes on how to use it without being crushed and lots of weapons for every resident. There are machetes, laser pistols, combat knifes and other assortments of weapons.

- Casino:
The Casino is what keeps people sane. When they are stressed or feeling lucky they head into the Casino and throw away there paper money for a chance to win big. Every resident over the age of 16 uses the Casino regularly.

- Education:
What would come of the youth if they had no education? They wouldn't be able to populate the Earth again and build up vast cities. This is why there are teachers and classrooms around the Vault for all residents under the age of 16. When a Vault Resident reaches the age of 16 they have to take the GOAT test, this tests to see what job they will have in the Vault or when they reach the wasteland.

TL;DR
Lots of descriptions of the different facilities.

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