Patent Number: 
Section: claims

1. A device comprising: an underground vertical shaft having a top and a bottom;  a nuclear reactor envelope suspended in said shaft at said top;  a nuclear reactor in said envelope;  an activatable release mechanism to release said nuclear reactor envelope when desired;  whereby activating said release mechanism causes said nuclear reactor envelope and said nuclear reactor to fall down to said bottom of said shaft further comprising a drainage pipe having an upper end and a lower end, said upper end being accessible from ground level and said lower end opening into a lower portion of said vertical shaft;  flowable material located in said drainage pipe and adjacent to said upper end;  an activatable gate abutting against said lower end, operably connected to said nuclear reactor, whereby falling of said nuclear reactor past said lower end activates said gate and causes said flowable material to flow through said drainage pipe into said vertical shaft on top of said nuclear reactor. 2. A device according to  claim 1 , further comprising: claim 1 a supply pipe having an upper portion accessible from ground level and a lower portion opening into said vertical shaft below said reactor, whereby filler placed in said supply pipe falls out of said lower portion and into said vertical shaft;  a pulverizing device positioned below said lower portion for pulverizing spent nuclear fuel to form pulverized nuclear fuel, positioned in said shaft below said lower portion of said supply pipe, whereby said pulverized fuel mixes with said filler and falls to said bottom of said shaft. 3. A device according to  claim 2 , wherein said pulverizing device mixes said pulverized nuclear fuel with said filler to form a mixture and places said mixture in a bag. claim 2 4. A device according to  claim 2 , wherein said pulverizing device is selected from the group consisting of a sand blasting machine and a grinder. claim 2 5. A device, comprising: a vertical shaft approximately 1200 feet deep and approximately 60 feet in diameter having a top and a bottom;  a support structure at the top of the shaft;  at least one stem extending downwardly from the support structure;  a nuclear reactor envelope suspended from the stem over the shaft;  a nuclear reactor enclosed in the envelope;  a release mechanism operably connected to the stem, whereby activating said release mechanism severs the stem and causes the reactor and the envelope to fall to the bottom of the shaft;  a drainage pipe having an upper end and a lower end, the upper end being accessible from ground level and the lower end opening into a lower portion of said vertical shaft;  a hopper attached to the upper end;  flowable material located in the drainage pipe and the hopper;  an activatable gate abutting against the lower end operably connected to the nuclear reactor envelope, whereby falling of the nuclear reactor envelope past the lower end activates the gate and causes the flowable material to flow through the drainage pipe into the vertical shaft and to fall on top of the nuclear reactor envelope and the nuclear reactor;  a supply pipe having an upper portion accessible from ground level and a lower portion which opens into the vertical shaft, whereby filler placed into the supply pipe falls out of the lower portion and into the vertical shaft;  a pulverizing device positioned below the lower portion for pulverizing spent nuclear fuel to form pulverized nuclear fuel, positioned near the shaft below the nuclear reactor envelope, whereby the pulverized nuclear fuel and filler can fall into the shaft;  wherein the pulverizing device mixes the pulverized nuclear fuel with the filler to form a mixture and places the mixture in a bag;  wherein the pulverizing device is selected from the group consisting of a sand blasting machine and a grinder. 6. A device according to  claim 5 , wherein the flowable material is dry sand. claim 5 7. A device according to  claim 6 , wherein surfaces of the gate, the hopper and the drainage pipe in contact with the flowable material are coated with waterproof sealant. claim 6 8. A device according to  claim 5 , wherein the release mechanism is selected from the group comprising an electric furnace and explosives. claim 5 9. A device according to  claim 5 , further comprising additional stems between the nuclear reactor envelope and the support structure. claim 5