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The deadline arrives: Checking in on the Reactor Pilot Program
On May 23, 2025, President Trump signed Executive Order 14301, “Reforming Nuclear Reactor Testing at the DOE,” which instructed the Department of Energy to create a Reactor Pilot Program (RPP)—a new system in which companies could pursue DOE authorization to build and test their first-of-a-kind nuclear technologies. EO 14301 set an ambitious goal for that program: three reactors achieving criticality by July 4, 2026.
William R. Martin, James J. Duderstadt
Nuclear Science and Engineering | Volume 62 | Number 3 | March 1977 | Pages 371-390
Technical Paper | doi.org/10.13182/NSE77-A26979
Articles are hosted by Taylor and Francis Online.
The Galerkin formulation of the finite element method is applied in space and angle to the equivalent integral law, or weak form, of the first-order neutron transport equation. The existence of a unique solution to the resultant system of algebraic equations is demonstrated using the positivity of the transport operator. Numerical results are given for the one-dimensional plane geometry application, including comparisons with the one-dimensional discrete ordinates code ANISN. A problem with strong heterogeneities is considered, and the use of discontinuous angular and spatial finite elements is shown to result in a marked improvement in the results. The success of the discontinuous elements is examined and it is seen that the discontinuous angular elements effectively match the analytical discontinuity in the angular flux at µ = 0 for plane geometry. Also, the use of discontinuous spatial elements is shown to result in treating continuity of the angular flux at an interface as a natural interface condition in the direction of neutron travel.