Very simplified boiling water reactors for commercial electricity generation

Patent metadata

Field	Value
Publication number	US-10706973-B2
Application number	US-201715585162-A
Country	US
Kind code	B2
Filing date	May 2, 2017
Priority date	May 2, 2017
Publication date	Jul 7, 2020
Grant date	Jul 7, 2020

Abstract

Nuclear reactors have very few systems for significantly reduced failure possibilities. Nuclear reactors may be boiling water reactors with natural circulation-enabling heights and smaller, flexible energy outputs in the 0-350 megawatt-electric range. Reactors are fully surrounded by an impermeable, high-pressure containment. No coolant pools, heat sinks, active pumps, or other emergency fluid sources may be present inside containment; emergency cooling, like isolation condenser systems, are outside containment. Isolation valves integral with the reactor pressure vessel provide working and emergency fluid through containment to the reactor. Isolation valves are one-piece, welded, or otherwise integral with reactors and fluid conduits having ASME-compliance to eliminate risk of shear failure. Containment may be completely underground and seismically insulated to minimize footprint and above-ground target area.

First claim

What is claimed is:

1. A simplified nuclear reactor facility for commercially generating electricity, the facility comprising:
a nuclear reactor;
a containment completely and impermeably surrounding the nuclear reactor, wherein there is no open coolant source or active coolant pump inside the containment;
at least one primary coolant loop connecting to two of a plurality of isolation valves of the nuclear reactor through the containment; and
at least one emergency coolant source outside the containment and connecting to two of the plurality of isolation valves of the nuclear reactor through the containment, wherein each of the plurality of isolation valves is integral with the nuclear reactor.

2. The facility of claim 1 , wherein the emergency coolant source is an isolation condenser system with a pool configured to condense a coolant of the nuclear reactor and transfer heat from the nuclear reactor to ambient environment.

3. The facility of claim 2 , wherein the isolation valve connected to the isolation condenser system are configured to fail open or open at detection of a transient event, and wherein the isolation valves connected to the primary coolant loop are configured to fail closed or close at detection of the transient event.

4. The facility of claim 1 , further comprising:
a plurality of penetration seals, wherein each one of the penetration seals lines and seals the containment at each one of the isolation valves.

5. The facility of claim 1 , wherein all penetrations that move a fluid coolant to or from the reactor include at least one of the isolation valves, and wherein the containment is fluid-tight up to 300 psig.

6. The facility of claim 1 , wherein the nuclear reactor is a maximum 1000 megawatt-thermal rated boiling water reactor having a height that exceeds its width by a factor of at least 3.9.

7. The facility of claim 1 , wherein the containment is entirely underground.

8. The facility of claim 1 , further comprising:
a silo surrounding the containment and the emergency coolant source, wherein the silo is a seismic structure configured to reduce seismic shocks to the containment, the emergency coolant source, and the nuclear reactor.

9. A nuclear reactor power plant for commercially generating electricity, the plant comprising:
a maximum 1000 megawatt-thermal rated boiling water nuclear reactor having a height that exceeds its width by a factor of at least 3.9;
a containment completely and impermeably surrounding the nuclear reactor, wherein there is no open coolant source or active pump inside the containment, and wherein the containment is completely underground;
at least one primary coolant loop connecting to the nuclear reactor through the containment;
at least one emergency coolant source outside the containment and connecting to the nuclear reactor through the containment, wherein the primary coolant loop and the emergency coolant source are integral with the nuclear reactor inside containment;
a plurality of isolation valves connecting the primary coolant loop and the emergency coolant source to the nuclear reactor through the containment, wherein each of the isolation valves includes a primary and a secondary actuator, and wherein each of the isolation valves is integral with the nuclear reactor;
a plurality of penetration seals, wherein each one of the penetration seals lines and seals the containment at each one of the isolation valves; and
a silo surrounding the containment and the emergency coolant source, wherein the silo is a seismic structure configured to reduce seismic shocks to the containment, the emergency coolant source, and the nuclear reactor.

10. A simplified nuclear reactor facility for commercially generating electricity, the facility comprising:
a nuclear reactor;
a containment completely and impermeably surrounding the nuclear reactor, wherein there is no open coolant source or active coolant pump inside the containment;
at least one primary coolant loop connecting to two of a plurality of isolation valves of the nuclear reactor through the containment; and
an isolation condenser system outside the containment with a pool configured to condense a coolant of the nuclear reactor and transfer heat from the nuclear reactor to ambient environment connecting to two of the plurality of isolation valves of the nuclear reactor through the containment, wherein each of the plurality of isolation valves,
includes a primary and a secondary actuator,
is integral with the nuclear reactor, and
is configured to be passively opened and passively sealed.

11. The facility of claim 10 , wherein the plurality of isolation valves connected to the isolation condenser system are configurewd to fail open or open at detection of a transient event, and wherein the isolation valves connected to the primary coolant loop are configured to fail closed or close at detection of the transient event.

12. The facility of claim 10 , further comprising:
a plurality of penetration seals, wherein each one of the penetration seals lines and seals the containment at each one of the isolation valves.

13. The facility of claim 10 , wherein all penetrations that move a fluid coolant to or from the reactor include at least one of the isolaton valves, and wherein the containment is fluid-tight up to 300 psig.

14. The facility of claim 10 , wherein the nuclear reactor is a maximum 1000 megawatt-thermal rated boiling water reactor having a height that exceeds its width by a factor of at least 3.9.

15. The facility of claim 10 , wherein the containment is entirely underground.

16. the facility of claim 10 , further comprising:
a silo surrounding the containment and the emergency coolant source, wherein the silo is a seismic structure configured to reduce seismic shocks to the containment, the emergency coolant source, and the nuclear reactor.

Assignees

• Ge Hitachi Nuclear Energy Americas Llc

Inventors

• Hunt Brian S
• Dahlgren Christer N
• Marquino Wayne

Classifications

• Y02E30/00

  Energy generation of nuclear origin · CPC title

• Y02E30/30

  Nuclear fission reactors · CPC title

• G21C15/18 Primary

  Emergency cooling arrangements; Removing shut-down heat · CPC title

• F16K3/314

  Forms or constructions of slides; Attachment of the slide to the spindle · CPC title

• F16K3/0254

  being operated by particular means · CPC title