This paper d e s c r i b e s t h e design concepts and hardware c o n f i g u r a t i o n of t h e slow e x t r a c t e d beam (SEB) s e c u r i t y system. SEB s e c u r i t y i s r e a l l y a ' s u bsystem of t h e AGS r i n g s e c u r i t y system i n t h a t i t i s i n t i m a t e l y t i e d i n t o AGS by b o t h monitoring s t a t u s of and i n t e r l o c k i n g c e r t a i n f u n c t i o n s of t h e AGS system. The d e s c r i p t i o n i s organized i n t o t h r e e t o p i c

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... : 1) Caves and g a t e c i r c u i t s . 2) Clearance c i r c u i t s . 3) Equipment monitoring and i n t e r l o c k i n g c i r c u i t s . Many of t h e s e c u r i t y system concepts i n SEB have been ta,en from t h e AGS r i n g system ( g a t e s , c l e a r a n c e s , r e s t r i c t e d / c o n t r o l l e d a c c e s s modes, sweeping of caves) t h e r e f o r e a f a m i l i a r i t y w i t h t h e AGS Ring Analysis -W. Gefers, i s fundamental t o t h i s d i s c u s s i o n . I n a d d i t i o n SEB s e c u r i t y inv o l v e s some f e a t u r e s n o t encountered i n AGS r i n g s e c u r i t y such as t h e beam k switchyard providing several o p t i o n s f o r beam d e l i v e r y , t h e e x i s t e n c e of primary and secondary beam areas r e q u i r i n g two l e v e l s of s e c u r i t y , and t h e Health Physics Group (HP) c o n t r o l s on g a t e s . S i m p l i f i e d schematics are included t o show t h e c o n t r o l l o g i c b u t n o t t h e a c t u a l w i r i n g of t h e c i r c u i t r y . Caves and Gate C i r c u i t s P r e s e n t l y t h e r e e x i s t 5 primary beam caves c o n t a i n i n g beam l i n e s t o two primary t a r g e t s t a t i o n s B and C / C ' . C s t a t i o n o r B and C s t a t i o n s p l i t . The o p t i o n s f o r beam d e l i v e r y are then I n a d d i t i o n t o t h e primary beam l i n e s , t h e r e are secondary beam l i n e s downstream of t h e t a r g e t s t a t i o n s which t r a n sp o r t secondary beams t o t h e experimental a p p a r a t u s . d i s c u s s e d except t o mention t h a t a less r i g o r o u s t r e a t m e n t i s g i v e n t o them and a f a i l u r e o r abnormal c o n d i t i o n , e.g. beam p l u g open and g a t e open,