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F i g u r e 11 i s a n a u t o r a d i o g r a p h of a specimen which had been e t c h e d p r i o r t o t r i t i u m exposure and shows low t r i t i u m c o n c e n t r a t i o n s a t g r a i n b o u n d a r i e s . b e h a v i o r was c o n s i s t e n t l y observed w i t h specimens t r e a t e d i n t h i s f a s h i o n . This The a b s e ice of t r i t i u m i s c o n s i s t e n t w i t h r a p i d d i f f u s i o n a l o n g g r a i n b o u n d a r i e s b u t i t i s n o t c l e a r why t h e e t c h e d specimens e x h i b i t e d l i t t l e s u r f a c e t r a p p i n g a t I L I I I I I I I I I I I I I I i 1 25 g r a i n b o u n d a r i e s w h i l e t h e unetched specimens showed h i g h grainboundary concentrations.

T h i c k o x i d e f i l m s tended t o spa11 from t h e m e t a l s u r f a c e and were no more e f f e c t i v e than thinner films i n r e t a r d i n g t r i t i u m . The t r i t i u m r e l e a s e r a t e s from t h e o x i d e were complex and appeared t o r e p r e s e n t s e v e r a l d i f f e r e n t r e l e a s e rates. A t y p i c a l r e l e a s e c u r v e from a h i g h l y o x i d i z e d specimen i s shown i n F i g u r e 24 which i l l u s t r a t e s t h e s e v e r a l components t o t h e r e l e a s e c u r v e .

From t h e s t a n d p o i n t o f environmental s a f e t y , t h e q u a n t i t y of i n t e r e s t i s t h e amount of t r i t i u m i n t h e primary c o o l a n t . Light water r e a c t o r p l a n t s keep t h i s c o n c e n t r a t i o n w i t h i n r e a s o n a b l e l i m i t s by f r e q u e n t l y r e p l a c i n g a p o r t i o n o f t h e primary system water w i t h f r e s h w a t e r . T h e r e have I I I I I I I I I I I I I I I I b I 30 been e f f o r t s by r e a c t o r manufacturers (26) t o c o r r e l a t e t h e observed primary system t r i t i u m a c t i v i t y t o t h e a c t i v i t y due t o boron and l i t h i u m r e a c t i o n s i n t h e primary w a t e r and a s s i g n t h e d i f f e r e n c e between t h e s e t o r e l e a s e of t r i t i u m from f u e l p i n s and b u r n a b l e poison p i n s .

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