Y
h e a t exchangers.
The d r a i n tank i s equipped with m u l t i p l e n a t u r a l con-
vectio n s a l t cooling systems which t r a n s f e r t h e a f t e r h e a t t o b o i l i n g water systems i n which t h e steam i s condensed i n a n a t u r a l d r a f t s t a c k . The h e a t removed from t h e primary h e a t exchangers by t h e secondary s a l t i s used t o generate steam i n tube and s h e l l steam ge ne r a tor s with t h e secondary s a l t on t h e s h e l l s i d e .
To reduce t h e p o s s i b i l i t y of f r e e z -
ing of t h e secondary s a l t , t h e feedwater e n t e r s t h e steam ge ne r a tor s a t
700째F. S u p e r c r i t i c a l steam i s generated a t 1000째F and 3600 p s i a . There a r e f o u r 14-0Mw thermal steam generators i n each of t h e f our secondary systems. P a r t of t h e steam from t h e steam ge ne r a tor s w i l l be used t o h e a t t h e feedwater i n a mixing t e e from about 550째F t o t h e 700째F r e quir ed . Otherwise, t h e steam cycle w i l l be similar t o t h a t of t h e TVA Bull Run steam p l a n t .