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instrumentation cables laid in horizontal configuration. sheath and insulation damage, effect of Fire-Retardant
Diesel pool fires having Heat Release Rate (HRR) of Paint (FRP) etc. upon exposure to hot gases and flames
approximately 150-250 kW were used. Both bare as in the CFTF enclosure. This activity was carried out in
well as cables coated with fire retardant paint, placed in collaboration with NPCIL and salient observations were
horizontal cable trays were used as target combustibles. consolidated in a technical note. A snapshot of cables
The parameters of interest were electrical continuity, before and after exposure to fire is shown in Fig. 7.15.

Fig. 7.15: Snapshot of Cables subjected to Diesel Pool Fire in an Enclosure

7.6.2 Fire Hazard Assessment of Electrical Cabinet

Studies on fires in electrical cabinets containing
components critical to reactor safety are being carried out
in collaboration with IGCAR and BHAVINI to support
regulatory safety review. A 3-D model of local electrical
control cabinet has been developed as per inputs
provided by BHAVINI. Several numerical simulations
have been carried out by varying fire parameters. A
snapshot of cable fire development within the cabinet is
shown in Fig. 7.16.

7.6.3 HYdrogen MItigation Facility (HYMIF)

Experimental studies on passive hydrogen removal
were continued mainly on (a) hydrogen removal rate Fig. 7.16: Development of Cable Fire within an Electrical
and (b) surface temperature of catalyst. Based on earlier Cabinet
experiments in HYMIF, it was observed that coupons
with Pt coated on ceramic substrate gives high reaction 7.6.4 AGMS and Coolant Channel Heat-up Facility
rate but high catalyst surface temperature. It is found
that coupons with Pt deposited on SS mesh results in An experimental facility has been set-up at SRI,
lower temperature, but the reaction rate per unit area Kalpakkam for investigating coolant channel heat-up
is also low. As only one of the required objectives is and annulus gas monitoring system. Tests were carried
met, further experiments were carried out with both out under no annulus gas flow conditions to demonstrate
types of coupons used in combination as shown in Fig. the synchronized functioning of all heaters, heater
7.17(a). It was found that this resulted in synergetic control modules, thermocouples and data acquisition
performance as depicted in Fig. 7.17(b). The cordierite system. Fig. 7.18 shows the temperature transients in
plate temperatures are lower and the average reaction the annular gas region for channel (1, 2), located at
rate is higher than when only cordierite plates are used. middle of bottom row in the 3×3 channel matrix.

AERB Annual Report 2019 87