IGCAR : Annual Report - Indira Gandhi Centre for Atomic Research

IGC
Annual Report 2007
these SSCs has to be done by
analysis, testing or from
experience data base. The SSC
list was further segregated
based on qualification
methodology. The document on
safety analysis has been
reviewed by AERB.
The major structures to be
analyzed are the Reactor
Containment Building (RCB),
Steam Generator Building
(SGB), Service Building (SB)
and Control Building (CB). The
major systems to be qualified
by analysis are the primary
sodium system and secondary
sodium system. Consultancy
contract was awarded to M/s
Engineering Mechanics and
Research Company (M/s
EMRC), Bangalore, for analysis
of RCB, SB & SGB as well as the
secondary sodium system.
EMRC has completed the
modeling and developed floor
response spectra for all the
buildings for the RBGM. The
modeling of secondary sodium
system has also been
completed by EMRC, and
analysis for the RBGM is in
progress. CED, IGCAR carried
out a parallel modeling of RCB
for checking the EMRC results.
The analysis of CB has been
carried out by CSED, AERB. The
modeling of the primary system
has been completed by NEG,
IGCAR, and analysis for the
RBGM and floor response
spectra thereof is in progress.
The analysis will include not
only structural integrity, but also
scrammability of the control
rods and pump non-seizure. In
addition, CED, IGCAR has
done the modeling of some
support system structures,viz
raw water pump house, cooling
tower and maintenance
building. Analysis of RCB
ventilation ducting is being
done by ROMG.
Ten components have been
identified for qualification by
testing on shake-table. For
these, the as-built drawings of
the panels
have been
prepared.
Testing will be
taken up
shortly.
qualified from experience data
base, subject to proper
anchorages. Plant walk-down
was carried out by a team of
engineers & specialists from
NPCIL, AERB & IGCAR. Seismic
interactions and anchorages
were studied. The findings of
the walk-down have been
reviewed by the AERB Review
Committee. The walk-down
revealed several areas where
proper anchorages are
required, and areas where
seismic house-keeping is called
for to avoid seismic interaction.
Seismic house-keeping has
been completed in zero level of
RCB.
The results of the analysis of
the SSC and of the qualification
tests of components in the
shake table will be submitted to
the Review Committee. Retrofitting
measures, if required,
will be taken up based on the
recommendations of the Review
Committee. The seismic
anchorages will be modified
wherever required, based on
the findings of the plant walkdown
and comments of the
Review Committee. These are
the minimum required for plant
relicensing.
Fig.2 Review basis ground motion
Several
components
have been
identified as
g e t t i n g
Finally, system modeling,
capacity assessment of
components and seismic
margin of the plant will be
assessed as a research activity.
6 FAST BREEDER TEST REACTOR