WPFC Expert Group on Liquid Metal Technology (EGLM)


The former WPFC Expert Group on Heavy Liquid Metal (EGHLM) Technology was active for several years. Its main objective was to issue a handbook with a collection of theoretical approaches and experimental data in order to deliver recommendations relevant for the design of HLM nuclear systems. After the second version of the handbook was issued, the expert group had re-discussed its scope and future related activities. In particular, as suggested by the Working Party on Scientific Issues of the Fuel Cycle (WPFC), it had been decided to include liquid sodium (Na) activities in the future work plan of the expert group. Secondly, the expert group aims to take the next step in the assessment of available data to bring it closer to application in design, construction and licensing issues on the one hand and operation, in-service inspection, handling and maintenance on the other hand. After the discussion, the expert group proposed to formulate its objectives as follows below.


Under the guidance of the Working Party on Scientific Issues of the Fuel Cycle (WPFC), the Expert Group on Liquid Metal Technology (EGLM) undertakes activities, with the goal to translate fundamental scientific understanding to application in support of (1) the development of construction codes used for design (design rules); (2) key technical issues for licensing; and (3) recommendations for operation, inspection and handling.


The topical areas and objectives of the expert group are:

  • Environmental conditions and factors that affect materials behaviour relevant to the structural integrity of confinement barriers and components. These include the impact on mechanical properties from the environment such as irradiation effects and liquid metal embrittlement, as well as environmental assisted property effects like corrosion.

    The objective is to assess the environmental effects relevant for construction standards via a fundamental understanding of materials behaviour (corrosion and mechanical properties in the liquid metals and under irradiation). The possibility of experimental data sharing among participants and analyses is to be investigated.

  • Coolant and cover gas issues. The focus is placed on issues relevant for radiological impact assessment, operation, including maintenance, inspection and handling, etc. Topics to be addressed are the chemistry, radiochemistry and physics of the coolant, its interaction with the cover gas, the impact of irradiation, the influence of corrosion, transport of radionuclides in the coolant, etc.

    The objective is to answer key technical issues to address radiological impact, operation, handling, maintenance and inspection as relevant for licensing.

  • Thermal-hydraulics for liquid metals. Thermal hydraulic behaviour of the coolant is a crucial factor in the sense that it essentially determines a large part of the environmental conditions for materials and the cooling such as the flow distribution and mixing, temperatures distribution, stratification and instabilities, pressure variations, coolant structure interactions, etc.

    The objective is to collect and assess experimental data in order to improve knowledge of the environmental conditions for materials and coolant behaviour.
EGLM activities infographic
Publications and reports
  • 4th meeting (22-23 May 2017)
  • 3rd meeting (14-15 November 2016)
  • 2nd meeting (24-25 May 2016)
  • 1st meeting  (22-23 October 2015)
  • Start-up meeting (17-18 May 2015)

EGLM working area (password protected | reminder)


Stephanie Cornet