Development and validation of LightAB: a new light general-purpose activation-burnup program

[Background] Reactor activation-burnup calculation is aan important crucial part component of reactor analysis, which is the iterative calculation by coupling the criticality program and point burnup programinvolving an iterative process that combines criticality programs with point burnup programs. [Purposes] LightAB (Light Activation and Burnup) is a novelnew lightweight, general-purposelight general-purpose activation-burnup program designed for this purpose. [Methods] LightAB used utilized burnup databases based on ORIGEN-2 and ORIGEN-S, the ORIGEN-2 and ORIGEN-S-based burnup databases, implementingand employed a Chebyshev rational approximation (CRAM) algorithm for rigid accurate burnup systems. LightAB supporteded point burnup calculation in decay mode, constant flux mode and constant power mode. MoreoverThe programs was well-structured, LightAB was highly packaged and divided intoconsisting of a solver module, an I/O module, and a burnup chain module. LightAB taked used nuclide as the basic storagefundamental unit of storage, and the input module of LightAB specifiedd physical quantities such as burnup database path and sub-burnup step division. [Results] The 237Np decay problem and the fixed-flux irradiation problem of Zr are calculated to verify the correctness of LightAB, where its results is consistent with that of ORIGEN2.1. LightAB and RMC programs are coupled and used to calculate the Pressurized Water Reactor (PWR) cell burnup model, the PWR assembly burnup model, and the OECD/Nuclear Energy Agency (OECD/NEA) fast reactor burnup model, and the results are consistent with that of RMCLightAB’s accuracy has been demonstrated through the successful calculation of the decay of 237Np and the irradiation of Zr under fixed-flux conditions, yielding results consistent with ORIGEN 2.1. By coupling with RMC programs, LightAB has been utilized in calculating various reactor burnup models, including Pressurized Water Reactor(PWR) cell, PWR assembly, and OECD/Nuclear Energy Agency(OECD/NEA) fast reactor models, with results being consistent with RMC calculations. [Conclusions] LightAB can be used in the simulation of radiation production of transplutonium isotopes.has shown promising application prospects in the irradiation production of transplutonium isotopes compared with RMC simulation calculations.