IGCAR : Annual Report - Indira Gandhi Centre for Atomic Research

IGC
Annual Report 2007
Control plug
HOT POOL
IHX
CORE
PUMP
CORE
Fig.2a Flow distribution in a
vertical plane (reference design)
Fig.2b Velocity distribution at free
surface of sodium (reference design)
Fig.3 Flow distribution with 3
baffles baffles (option-a)
Baffle
HANGING
SHELL
HANGING
SHELL
CORE
Fig.4 Flow distribution with 2 m
width baffle (option-b)
Fig.5a Details of hanging shell
with cut-outs (option-c)
Fig.5b Flow distribution with
hanging shell and baffle (option-c)
modifications in the control
plug skirt, in the form of
providing circumferential slots
either in the top or in the
middle of the skirt was also
studied. These studies were
carried out with the objective of
finding the lowest possible free
level velocity.
The following are the
conclusions of the study:
(a) Inverted L baffle on redan
along with horizontal baffles on
control plug and upper shell of
inner vessel, was seen to be
very effective in mitigating free
surface velocity to 0.18 m/s
(Fig. 3).
(b) By using a single annular
plate of 2 m width above IHX
inlet, the velocities on the free
surface can be kept within
0.25 m/s (Fig. 4).
These devices are judged to
be un-practical considering the
advanced stage of manufacture
of inner vessel and control
plug.
(c) By having a horizontal
baffle of 0.5 m width attached
to the upper shell of inner
vessel and lowering the roof
slab inner shell upto IHX inlet,
the free surface velocity could
be reduced to 0.40 m/s (Fig.
5a and 5b).
Considering the ease of
construction, option (c) has
been selected.
30 R&D FOR FBRs