Heating and cooling of the thermal shield

4-5-4 Heatiog and Cooling of the Thermal Shield. Heat production in the thermal, shield has been calculated, and these, caIculations -show a total 

The temperature produced in the steel by th is, heat production is highest in the bottom thermal shield and in the. east side wall with slab loading. With the present design of the shield (see Section 2.5.1).and air flow of 25,000. cfm, it is estimated that, the maximum steel temperature in the bottom shield will not exceed the air temperature by more than 150°F at 60,000 kw operation. Furthermore, the maximum temperature of the steel next to the concrete will be less than 70 F above the air temperature. 

Temperatures in the east. side wall are high because of proximity to t. he active lattice (slab loading on eas. t. side) Present design calls for insulation between the graphite and the steel in the.side walls to reduce hsat conduction from the graphite into the steel. 

5 Cooling Reqnirements at Reduced Power Levels and After Shutdown. 

The cooling requirements at reduced power levels have been calculated the results are plotted in Fig. 45.C. 

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