In MAPS Unit # 1 end-shield cooling system has got heaters. Why?

In MAPS Unit # 1 end-shield cooling system has got heaters. Why?
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Answer :

Unit # 1 end-shield is made of nickel steel, which had a nil ductility temperature of -100°C while commissioning. After 30 years of operation this will rise to +32°C, because of radiation exposure. To avoid the failure of end shield of MAPS Unit # 1 the temperature of the end-shield should be maintained at 68°C always. MAPS 1 end-shield cooling system is operating at elevated temperature. But in MAPS Unit #2 this problem is not existed because in this unit end-shields are made up of stainless steel. 
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