Studsvik Scandpower has been appointed as agent for the sale and distribution of the UK's National Nuclear Laboratory’s (NNL) ENIGMA fuel performance software. Studsvik will market the software alongside its own fuel core analysis software, CMS.

"This is an effort of Studsvik and NNL to join forces and combine two established technologies into a multiphysics application that we believe will be valuable for our customers. It provides a basis for a better understanding of how our customers can protect their fuel in Nuclear Power Plant operation", says Thomas Smed, president of Studsvik Scandpower.

ENIGMA is a state of the art fuel performance code that calculates the thermo-mechanical performance of an LWR fuel rod in both steady-state and transient conditions. ENIGMA is used in the design, licensing and safety analysis performance of a range of fuel types, including uranium dioxide (UO2) and mixed plutonium and uranium oxide (MOX). The code has been used for several definitive design and licensing assessments for both UO2 and MOX fuel, including licensing UO2 and gadolinia-doped UO2 in Sizewell B and Finland's Loviisa VVER-440 reactors, and mixed oxide (MOX) fuel in the Swiss Beznau 1 PWR.

ENIGMA is also used in support of MOX production in the Sellafield MOX Plant (SMP) and to perform feasibility studies for advanced fuels, as well as for strategic assessments such as plutonium management in new build UK reactors.