Patent Number: 
Section: claims

1. A dry standby liquid control system for a nuclear reactor, comprising:a standby vessel including dry powder, the dry powder including boron;a high pressure water supply in communication with the standby vessel via a first closed valve, the standby vessel being in communication with a reactor vessel via a second closed valve, the high pressure water supply being connected to an interior pipe system having a plurality of mixing holes within the standby vessel. 2. The dry standby liquid control system for a nuclear reactor according to claim 1, wherein the high pressure water supply includes a heater. 3. The dry standby liquid control system for a nuclear reactor according to claim 1, wherein the second closed valve is disposed in a bottom of the standby vessel in communication with a mixer eductor disposed on an outboard side of the second closed valve and in communication with the reactor vessel. 4. The dry standby liquid control system for a nuclear reactor according to claim 1, wherein the dry powder containing boron includes dry sodium pentaborate. 5. The dry standby liquid control system for a nuclear reactor according to claim 1, wherein the interior pipe system includes at least one pipe extending along an interior sidewall of the standby vessel. 6. The dry standby liquid control system for a nuclear reactor according to claim 5, wherein the interior pipe system further includes a portion extending along an upper region of the vessel. 7. The dry standby liquid control system for a nuclear reactor according to claim 5, wherein the plurality of water mixing holes are arranged in the at least one pipe to induce a swirl within the standby vessel. 8. The dry standby liquid control system for a nuclear reactor according to claim 7, wherein the plurality of water mixing holes include a first plurality of water mixing holes directed generally tangential to the interior sidewall of the standby vessel and a second plurality of water mixing holes directed toward a center of the standby vessel. 9. A boiling water reactor system, comprising:a reactor vessel including a reactor core;a steam line in communication with the reactor core and a turbine that is connected to an electrical generator;a standby vessel including dry powder, the dry powder including boron and including a high pressure water supply in communication with the standby vessel via a first closed valve, the standby vessel being in communication with the reactor vessel via a second closed valve, wherein the high pressure water supply being connected to an interior pipe system having a plurality of mixing holes disposed within the standby vessel. 10. The boiling water reactor system according to claim 9, wherein the second closed valve is disposed in a bottom of the standby vessel in communication with a mixer eductor disposed on an outboard side of the second closed valve and in communication with the reactor vessel. 11. The boiling water reactor system according to claim 9, wherein the dry powder containing boron includes dry sodium pentaborate. 12. The boiling water reactor system according to claim 9, wherein the interior pipe system includes at least one pipe extending along an interior sidewall of the standby vessel. 13. The boiling water reactor system according to claim 12, wherein the interior pipe system further includes a portion extending along an upper region of the vessel. 14. The boiling water reactor system according to claim 12, wherein the plurality of water mixing holes are arranged in the at least one pipe to induce a swirl within the standby vessel. 15. The boiling water reactor system according to claim 14, wherein the plurality of water mixing holes include a first plurality of water mixing holes directed generally tangential to the interior sidewall of the standby vessel and a second plurality of water mixing holes directed toward a center of the standby vessel.