# How Nuclear Power Plants Reuse Fuel Between Multiple Reactors > This patent describes a method for nuclear power plants with several reactors to efficiently reuse partially used fuel by moving it between different reactor cores across multiple operating cycles. - **Patent:** US 10818403 - **Original title:** Inter-module fuel shuffling - **Owner:** Nuscale Power - **Granted:** 2020 - **Status:** Active - **Times cited:** 2 - **Field:** energy, nuclear_power, mechanical, engineering ## What it does This patent describes a method for operating a power plant that has multiple nuclear reactor cores. In a first operating period, called a "fuel cycle," the method involves loading a first reactor core with both fresh fuel and some partially used fuel (Claim 1). Simultaneously, a second reactor core is loaded with its own fresh fuel and partially used fuel (Claim 1). After this first cycle is complete, in a second fuel cycle, the method specifies moving the partially used fuel from the first reactor core into the second reactor core, alongside new fresh fuel for the second core (Claim 1, Claim 2). This "shuffling" strategy allows the plant to get more energy out of the fuel by using it in different reactors for different periods. For example, a fuel assembly might start in Reactor 1, then be moved to Reactor 2, and later to Reactor 3, before being fully spent, as described in further claims like Claim 3 and Claim 8. ## What it does NOT cover - Fuel management methods for power plants with only a single reactor core. - Loading fresh fuel into a reactor core without also loading partially spent fuel from another core. - Methods that do not involve physically moving fuel assemblies between different reactor cores across fuel cycles. - Fuel shuffling strategies that do not include the specific sequence of loading fresh and partially spent fuel as described in the claims. - The use of specific fuel types like uranium-oxide (UO2) or mixed uranium-plutonium oxide (MOX) fuel, unless those specific fuel types are explicitly used in the claimed shuffling method. ## The clever bit The novelty lies in the specific, multi-stage strategy of inter-module fuel shuffling, where partially spent fuel from one reactor core is precisely relocated to another core in a subsequent fuel cycle. This maximizes the energy extracted from the fuel across an entire multi-reactor plant, rather than just within a single reactor. ## Real-world examples 1. NuScale Power's Small Modular Reactors (SMRs) 2. Future multi-module nuclear power plants 3. Advanced reactor designs focused on fuel efficiency ## Why it matters Optimizing how nuclear fuel is used is crucial for both economic efficiency and reducing nuclear waste. This method aims to extract more energy from each fuel assembly by strategically moving it between different reactors in a multi-module plant. This could lead to longer operational periods for fuel, lower fuel costs, and less spent fuel requiring long-term storage, which is a significant challenge for the nuclear industry. ## Frequently asked questions ### What does How Nuclear Power Plants Reuse Fuel Between Multiple Reactors cover? This patent describes a method for nuclear power plants with several reactors to efficiently reuse partially used fuel by moving it between different reactor cores across multiple operating cycles. ### Who owns patent US 10818403? Nuscale Power owns this patent, granted in 2020. ### When does this patent expire? This patent is expected to expire on February 28, 2037, when the invention enters the public domain. ### What is patent US 10818403 cited by? This patent has been cited by 2 later patents that build on its ideas. ### What problem does this patent solve? Optimizing how nuclear fuel is used is crucial for both economic efficiency and reducing nuclear waste. This method aims to extract more energy from each fuel assembly by strategically moving it between different reactors in a multi-module plant. This could lead to longer operational periods for fuel, lower fuel costs, and less spent fuel requiring long-term storage, which is a significant challenge for the nuclear industry. ### What does this patent NOT cover? Fuel management methods for power plants with only a single reactor core. **Full plain-English explainer:** https://patentbrief.org/patent/us/10818403/inter-module-fuel-shuffling **Original patent:** https://patents.google.com/patent/US10818403 --- _Source: PatentBrief — https://patentbrief.org. Patent facts are from public records; the plain-English explanation is PatentBrief's._ ## Related patents Semantically similar inventions in the PatentBrief corpus: - [How a Portable Nuclear Reactor Stays Stable During Operation](https://patentbrief.org/patent/us/11495363/small-modular-mobile-fission-reactor) — This patent describes a small, portable nuclear fission reactor designed to be moved by ship, train, or truck, featuring a special internal design to keep its fuel and control rods stable and centered during operation. - [How a Molten Metal Buffer Improves Heat Transfer in Nuclear Reactors](https://patentbrief.org/patent/us/11942229/molten-metal-fuel-buffer-in-fission-reactor-and-method-of-manufacture) — This patent describes a nuclear fission reactor design that uses a liquid molten metal to fill gaps between the nuclear fuel and its protective casing, improving heat transfer and reactor safety. - [How a Nuclear Reactor's Rotating Drum Controls Power](https://patentbrief.org/patent/us/11417435/control-drum-for-a-mobile-nuclear-reactor) — This patent describes a rotating drum for nuclear reactors, especially mobile ones, that uses tubes filled with different materials to absorb or scatter neutrons, precisely controlling the reactor's power output. - [How to Make Meltdown-Proof Nuclear Fuel Pellets](https://patentbrief.org/patent/us/10475543/dispersion-ceramic-micro-encapsulated-dcm-nuclear-fuel-and-related-methods) — This patent describes a method for making a new type of nuclear fuel called Dispersion Ceramic Micro-Encapsulated (DCM) fuel, which uses tiny, specially coated uranium particles embedded in a super-strong silicon carbide material to prevent meltdowns in nuclear reactors. - [Making Special Materials Inside Commercial Nuclear Power Plants](https://patentbrief.org/patent/us/9239385/method-of-producing-isotopes-in-power-nuclear-reactors) — This patent describes a method for using the neutron radiation inside large commercial nuclear power reactors, specifically in their existing instrumentation tubes, to create useful isotopes like those used in medicine or industry.