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K. N. D. K. AGARWAL Reactor Group, Bhabha Atomic Research Centre, Trombay, Mumbai, India Abstract The on-line use of Personal Computers in research reactors, with custom made applications for aiding the operators in analyzing plant conditions under normal and abnormal situations, has become extremely popular. A system has been developed to monitor and evaluate important parameters for the research reactor DHRUVA, a 100 MW research reactor located at the Bhabha Atomic Research Centre, Trombay. The system was essentially designed for on-line computation of the following parameters: reactor thermal power, reactivity load due to Xenon, core reactivity balance and performance monitoring of shut-down devices.

COOLANT TEMP. 6400 LEGEND -*-- AT NOMINAL POWER(NP) AT OVER POWER (OP) 0 20 30 40 ACTIVE LENGTH (MM) Fig. 5: Distribution of the temperature of the fuel plate and coolant for hot channel case HEAT FLUX (WTT/CM2) (NOMINAL POWER) 500 450 400 HEAT F L U X AT DNB 350 300 250 200 HEAT F L U X AT ONB 150 100 A C T U A L HEAT F L U X 50 0 0 10 20 30 40 50 ACTIVE LENGTH (MM) Fig. 6: Distribution of the temperature of fuel plate and coolant for hot channel case 60 (NOMINAL POWER) HEAT FLUX (WATT/CM2) 500 r ~ " " " ~~—"——~~ ~ ____| 450 HEAT F L U X AT DNB 400 350 300 250 200 HEAT FLUX AT ONB 150 100 ACTUAL HEAT FLUX 50 0 0 10 20 30 40 50 ACTIVE LENGTH (MM) Fig.

In the case of the average channel, the clad temperature does not reach the saturation temperature. The results of calculations show that the safety margin to flow instability represents the limiting parameter regarding safe design and operation. I. 1 Fluid Flow in channels Under normal operating condition, heat transfer from the fuel plate to the coolant occurs by convection phenomena. In case of forced convection, the rate of the heat being trasferred is proportional to the temperature difference between plate surface and coolant temperature.

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