Patent Number: 
Section: claims

1. A method of cooling a core of a nuclear reactor, the method comprising:contacting the nuclear reactor core with an aqueous solution comprising at least one of polyhedral boron hydride anions or carborane anions dissolved in the aqueous solution. 2. The method of claim 1, wherein the at least one of polyhedral boron hydride anions or carborane anions are enriched in 10B. 3. The method of claim 1, wherein the at least one of polyhedral boron hydride anions or carborane anions comprise at least one of B10H102−, B11H14−, CB11H12−, or B12H122−. 4. The method of claim 1, wherein the aqueous solution comprises polyhedral boron hydride anions dissolved in the aqueous solution. 5. The method of claim 4, further comprising dissolving a salt selected from the group consisting of Li2B10H10, Na2B10H10, K2B10H10, (NH4)2B10H10, LiB11H14, NaB11H14, KB11H4, (NH4)B11H14, Li2B12H12, Na2B12H12, K2B12H12, (NH4)2B12H12, and combinations thereof in water to provide the aqueous solution. 6. The method of claim 1, further comprising dissolving a Group I or ammonium salt comprising the at least one of polyhedral boron hydride anions or carborane anions in water to provide the aqueous solution. 7. The method of claim 6, wherein the Group I or ammonium salt has at least 25 percent by weight boron. 8. The method of claim 1, further comprising dissolving a salt having a water solubility of at least 15 grams per 100 grams of solution at 20° C. in water to provide the aqueous solution comprising the at least one of polyhedral boron hydride anions or carborane anions dissolved in the aqueous solution. 9. The method of claim 1, wherein the nuclear reactor is a light water reactor, a boiling water reactor, a pressure water reactor, a reactor having an electricity output of less than 500 megawatts, or a heavy water reactor. 10. The method of claim 1, wherein contacting the nuclear reactor core with the aqueous solution is carried out during an emergency shutdown of the nuclear reactor. 11. A nuclear reactor comprising a nuclear reactor core including an aqueous solution,wherein the aqueous solution includes at least one of polyhedral boron hydride anions or carborane anions dissolved therein,wherein the aqueous solution is a part of at least one of:core coolant usable in operation of the nuclear reactor core, andcore coolant usable in emergency cooling of the nuclear reactor core. 12. The nuclear reactor of claim 11, wherein the at least one of polyhedral boron hydride anions or carborane anions are enriched in 10B. 13. The nuclear reactor of claim 11, wherein the at least one of polyhedral boron hydride anions or carborane anions comprise at least one of B10H102−, B11H14−, CB11H12−, or B12H122−. 14. The nuclear reactor of claim 11, wherein the aqueous solution comprises polyhedral boron hydride anions dissolved in the aqueous solution. 15. The nuclear reactor of claim 14, wherein the aqueous solution comprises a dissolved salt selected from the group consisting of Li2B10H10, Na2B10H10, K2B10H10, (NH4)2B10H10, LiB11H14, NaB11H14, KB11H14, (NH4)B11H14, Li2B12H12, Na2B12H12, K2B12H12, (NH4)2B12H12, and combinations thereof. 16. The nuclear reactor of claim 11, wherein the aqueous solution comprises a dissolved Group I or ammonium salt. 17. The nuclear reactor of claim 16, wherein the Group I or ammonium salt has at least 25 percent by weight boron. 18. The nuclear reactor of claim 11, wherein the aqueous solution comprises a dissolved salt having a water solubility of at least 15 grams per 100 grams of solution at 20° C. 19. The nuclear reactor of claim 11, wherein the nuclear reactor is a light water reactor, a boiling water reactor, a pressure water reactor, a reactor having an electricity output of less than 500 megawatts, or a heavy water reactor. 20. The nuclear reactor of claim 11,wherein the nuclear reactor comprises an emergency core cooling system,the emergency core cooling system comprising:a vessel containing an emergency aqueous solution that includes at least one of polyhedral boron hydride anions or carborane anions dissolved therein; anda conduit leading from the vessel to an applicator positioned to deliver the emergency aqueous solution to the nuclear reactor core.