# 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: - [TerraPower's Molten Salt Reactor with Internal Heat Exchangers](https://patentbrief.org/patent/us/11728052/fast-spectrum-molten-chloride-test-reactors) — This patent describes a unique molten salt nuclear reactor design by TerraPower, featuring an open-topped vessel and integrated heat exchangers for efficient internal cooling and fuel circulation. - [Using Gas Pressure to Safely Control Liquid Fuel Nuclear Reactors](https://patentbrief.org/patent/us/12073952/fail-safe-reactivity-compensation-method-for-a-nuclear-reactor) — This patent describes a method to control a nuclear reaction in liquid-fueled reactors by using gas pressure to adjust the amount of fuel solution in special pipes, ensuring the reactor always returns to a safe state if something goes wrong. - [How the First Nuclear Reactor Works](https://patentbrief.org/patent/us/2708656/nuclear-reactor-fermi-szilard) — The foundational 1955 patent by Enrico Fermi and Leo Szilard describing the design of the first nuclear reactor capable of a self-sustaining chain reaction. - [How Space Taxis and Locomotives Move Satellites Between Orbits](https://patentbrief.org/patent/us/11492143/catching-super-heavy-booster) — A modular system using a small 'rendezvous' vehicle to collect satellites and a larger 'locomotive' vehicle to haul them to their final destination in space. - [How Boeing Stacks Electric Space Vehicles for Launch](https://patentbrief.org/patent/us/11708181/mechazilla-catch-tower) — A design for a launch vehicle that carries two space vehicles stacked on top of each other, both using electric propulsion systems for movement in space.