Transcript Discussion Session

1
Discussion Session on LiPb specifications and LiPb/T data
1 – LiPb/Tritium data depend strongly on LiPb composition (% atoms of Li, real
eutectic?) and on the presence of some impurities (which ones?)

Before validate (nationally and internationally) we need to specify %atoms Li and
acceptable impurities and their maximum level  specifications

We need to apply such specifications systematically: “geographically” (i.e. all
laboratories) and “temporarily” (from now throughout all future years)  quality
assurance on results
 Proposed actions:
1) EU prepares and distributes the specifications (by Sept.15)
2) Comments, possible counter-proposals from other interested Parties (by Oct. 2 at
ISFNT-8)
3) Following discussion reach of a final agreement  “Reference” LiPb (by end 2007)
Agreement on actions and planning?
Need also to define experimental methods and procedures for checking
“specifications”…
L. Giancarli
LBB Workshop, Idaho Falls, 11-12 June 2007
2
Discussion Session on LiPb specifications and LiPb/T data
2 – Significant uncertainties are present on the value of the Sievert constant, many
performances of LiPb blankets depend on this value, therefore uncertainties
have to be significantly reduced (and understood)


Proposal of launching an International Benchmark on the measurement of the Sievert
constant at different fixed Tritium partial pressures (3?) to be specified and agreed
(possible in this Workshop?).
Experiment should be done using the Reference LiPb and possible with Tritium (to be
able to measure it at very low T-concentrations)
 Proposed actions:
> All Parties interested in LiPb blankets should participate to this experimental benchmark
1) Preliminary discussions in this meeting and identification of the Party who should make
a detailed proposal of benchmark by the end of 2007
2) Comments from other interested Parties and agreement on the benchmark description
(by Spring 2008)
3) All Parties perform the experiment, results comparison and assessment of the results by
a group of experts by Spring 2009
 Definition of the reference value
Agreement on actions and planning? (Afterwards, other experiments could be shared)
L. Giancarli
LBB Workshop, Idaho Falls, 11-12 June 2007