Prime pagine RA2010FUS:Copia di Layout 1 - ENEA - Fusione

technology programme (cont’d.)
progress report
2010
081
acceptable to avoid unscrewing torque to be higher than
80 Nm has been assessed for the bolts considered.
Further analyses will be carried out in 2011 to investigate the
potential influence of the screw length of engagement on the
bolt connection thermo–mechanical performances, in
presence of neutron swelling.
3) Bolting seizure and the pre–stress tests. This activity is addressed to
select suitable materials for bolts with the objective to prevent
their seizure or relaxation. The first test was performed early
in 2010, by using the test section shown in figure 3.54, and due
to the bad results (all the bolts broke after an exposure of 1000
hrs at 350°C) the experiment will be repeated in 2011.
4) Validation of the skate system concept. This task is focused at
evaluating the performance and the reliability of the skate
system. In 2010 the following activities were performed:
• Control and DAQ systems design was completed;
• A set of sensors (extensometers) to perform a preliminary
test on the BP already available in DRP were purchased
and delivered.
The setting up of the experiment will start early in 2011.
The RH tasks were focussed on the validation of the cleaning
procedure for the removal of sticked lithium metal from steel. In
detail:
• Cleaning procedure. In order to clean up steel specimens from
sticked liquid metals, at ENEA Brasimone a mixed low acidic
solution was developed. It consists of: acetic acid [1N]
(CH 3
COOH)+hydrogen peroxide (H 2
O 2
)+Ethanol
(CH 3
CH 2
OH) with the same ratio (1:1:1).
This cleaning solution has been used at room temperature, for
cleaning Li, PbLi, Pb, LBE and, according to weight
measurements and electronic microscopy, no steels' kind
(ferritic or martensitic or austenitic) have ever been attacked or
modified or corroded due to the treatment.
This cleaning solution can be used both by immersion or
spraying over a dirty surface.
• RH test of the cleaning procedure. To test the feasibility of the
cleaning operations a very simple tool (see fig. 3.55) was
manufactured and some trials were performed. Tests were
performed by using a prototype of the backplate frame and a
simulation of the TMs (a simple steel plate). The space
available to perform the operation was of about 5 cm, which
is the space left by the high flux test module (HFTM) once
removed.
Engineering design of the IFMIF target assembly system (ED 03).
The technical work performed in the reporting period was
dedicated to: 1) starting the design of the target assembly with
bayonet BP for IFMIF; 2) making a preliminary neutronic
calculation of the newly designed BP.
1) Design of the IFMIF target assembly. A preliminary 3D CATIA
model of the BP component – including the lateral skate
systems and the double reducer nozze – has been
accomplished (fig. 3.56). Starting from the Engineering
Validations and Environmental Engineering Design Activities
εsw=0.1%
Figure 3.52 – Von Mises stress distribution at
different swelling strain
T(Nm)
1200
800
400
0
0.0
M10
M12
M16
0.04 0.08
ε sw (%)
Figure 3.53 – Unscrewing torque vs swelling
volumetric strain
F82H
F82H
EUROFER
Inconel
Figure 3.54 – Test rig for the bolted coupling
system
Figure 3.55 – Cleaning tool
Figure 3.56 – Front view a) and rear view b)
ofthe newly designed IFMIF target