ML072120119
| ML072120119 | |
| Person / Time | |
|---|---|
| Site: | Technical Specifications Task Force |
| Issue date: | 07/25/2007 |
| From: | Kobetz T J NRC/NRR/ADRO/DIRS/ITSB |
| To: | Technical Specifications Task Force |
| Schulten C. S., NRR/DIRS, 415-1192 | |
| Shared Package | |
| ML072070202 | List: |
| References | |
| TAC MD5249, TSTF-493, Rev 2 | |
| Download: ML072120119 (15) | |
Text
R el i ef and LL S I nst r um ent at i on B 3.3.6.5 BW R/6 ST S B 3.3.6.5-1 R ev. 3.0, 03/31/04 B 3.3 I NS TRU ME NTA TI ON B 3.3.6.5 Rel i ef and Lo w-Low Set (LLS) I nst r um ent at i on BAS ES BA C KG R O U N D T he s af et y/r el i ef v al v es (S/R Vs) pr ev ent ov er pr ess ur i z at i on of t he nuc l ear s t e a m s y s t e m. I n s t r u me n t a t i o n i s p r o v i d e d t o s u p p o r t t w o mo d e s o f S/RV oper at i on - t he r el i ef f unct i on (al l v al v es) and t he LLS f unct i on (sel ect ed v al v es). R ef er t o LCO 3.4.4, " Saf et y/R el i ef Val v es (S/R Vs)," and LC O 3.6.1.6, " Low-Low Set (LLS) Saf et y/R el i ef Val v es (S/R Vs)," f or A p p l i c a b i l i t y B a s e s f o r a d d i t i o n a l i n f o r ma t i o n o f t h e s e mo d e s o f S/RV oper at i on. T hi s i s ac hi ev ed by spe ci f y i ng l i m i t i ng s af et y sy st em set t i ngs (L S S S) i n te rm s o f p a ra m e te rs d i re c tl y m o n i to re d b y th e P ri m a ry C ont ai nm ent I sol at i on I nst r um ent at i on, as we l l as L C O s on ot her r eact or s y s t e m p a r a m e t e r s a n d e q u i p m e n t p e r f o r m a n c e. Th e s u b s e t o f L SSS t hat di r ect l y pr ot ect agai nst v i ol at i ng t he r R eact or C cor e Saf et y Li m i t s an d o r th e R e a c to r C o o la n t S ys te m (R C S) p P re s s u re b o u n d a ry S s a f e ty L li m its d u rin g a n tic ip a te d o p e ra tio n a l o c c u rre n c e s (A O O s) a re re f e rre d to a s S a fe ty L i m i t L S S S (S L-L S S S).10 CF R 50.36(c)(1)(i i)(A) r equi r es t hat T Ss i ncl ude LSSS s f or v ar i abl es t hat hav e si gni f i cant s a f e t y f u n c t i o n s. F o r v a r i a b l e s o n w h i c h a SL h a s b e e n p l a c e d , t h e L SSS m ust be c hose n t o i ni t i at e aut om at i c pr ot ect i v e ac t i on t o co r r ect abnor m al s itu a tio n s b e f o re th e S L is e x c e e d e d. Te c h n i c a l Sp e c i f i c a t i o n s a r e r e q u i r e d b y 1 0 CFR 5 0.3 6 t o c o n t a i n L SSS d e fi n e d b y t h e r e g u l a t i o n a s "...s e t t i n g s for a u t o m a t i c p r o t e c t i ve dev i ces...so c hose n t hat aut om at i c pr ot ect i v e ac t i ons wi l l cor r ect t he abnor m al si t uat i on bef or e a Saf et y Li m i t (SL) i s ex ceed ed." T he Anal y t i cal Li m i t i s t he l i m i t of t he pr oces s v ar i abl e at whi ch a saf et y act i on is in iti a te d , a s e s ta b li s h e d b y th e s a f e ty a n a ly s is , to e n s u re th a t a n S L is not ex ceed ed. Any aut om at i c pr ot ect i on ac t i on t hat occ ur s on r each i ng th e A n a ly tic a l L im it th e re f o re e n s u re s th a t th e S L is n o t e x c e e d e d. H owev er , i n pr act i ce, t he ac t ual set t i ngs f or aut om at i c pr ot ect i v e dev i ces m u s t b e c h o s e n to b e m o re c o n s e rv a tiv e th a n th e A n a ly tic a l L im it to accou nt f or i nst r um ent l oop unce r t ai nt i es r el at ed t o t he se t t i ng a t wh i ch th e a u to m a ti c p ro te c ti v e a c ti o n w o u l d a c tu a l l y o c c u r.-------------------------------- R E V IE W E R'S N O T E ----------------------------------T he t er m " Li m i t i ng T r i p Set poi nt (LT SP)" i s ge ner i c t er m i nol ogy f or t he set poi nt v al ue c al cul at ed by m eans of t he pl ant-spec i f i c s et poi nt m e th o d o lo g y d o c u m e n te d in a d o c u m e n t c o n tro ll e d u n d e r 1 0 C F R 5 0.5 9. T he t er m Li m i t i ng T r i p Set poi nt i ndi cat es t hat no add i t i onal m ar gi n has b e e n a d d e d b e tw e e n th e A n a ly tic a l L im it a n d th e c a lc u la te d trip s e ttin g. W her e m ar gi n i s ad ded bet ween t he Anal y t i cal Li m i t and t r i p se t poi nt , t he te rm N o m in a l T rip S e tp o in t (N T S P) is p re f e rre d. T h e trip s e tp o in t (f ie ld s e ttin g) m a y b e m o re c o n s e rv a tiv e th a n th e L im iti n g o r N o m in a l T rip Set poi nt. W her e t he [LT SP] i s no t doc um ent ed i n SR 3.3.6.5.3 f or t he pur pose of com pl i ance wi t h 10 CFR 50.36, t he pl ant-spec i f i c t er m f or t he R el i ef and LL S I nst r um ent at i on B 3.3.6.5 BW R/6 ST S B 3.3.6.5-2 R ev. 3.0, 03/31/04 L im iti n g o r N o m in a l T rip S e tp o in t m u s t b e c ite d in N o te 2 o f S R 3.3.6.5.3. T he br ack et s i ndi cat e pl ant-spec i f i c t er m s m ay appl y , as r ev i ewed and a p p ro v e d b y th e N R C. T h e a s-f o u n d a n d a s-le f t to le ra n c e s w il l a p p ly to th e a c tu a l s e tp o i n t i m p l e m e n te d i n th e S u rv e i l l a n c e p ro c e d u re s to c o n firm c h a n n e l p e rf o rm a n c e. Li cens ees ar e t o i nser t t he nam e of t he doc um ent (s) con t r ol l ed unde r 10 C FR 50.59 t hat con t ai n t he [LT SP] and t he m et hodol ogy f or cal cul at i ng t he as-l ef t and as-f ound t ol er ance s, f or t he phr ase "[a doc um ent c o n tro ll e d u n d e r 1 0 C F R 5 0.5 9]" in th e s p e c ific a tio n s.]--------------------------------------------------------------------------------------------------BAS ES BA C KG R O U N D (cont i nued)T h e [L i m i ti n g T ri p S e tp o i n t (L T S P)] i s a p re d e te rm i n e d s e tt i n g fo r a pr ot ect i v e dev i ce c hose n t o ens ur e aut om at i c ac t uat i on pr i or t o t he pr oces s v ar i abl e r each i ng t he Anal y t i cal Li m i t and t hus ensu r i ng t hat t he SL woul d not be ex ceed ed. As suc h, t he [LT SP] acc ount s f or unce r t ai nt i es i n se t t i ng t he dev i ce (e.g., cal i br at i on), unc er t ai nt i es i n how t he dev i ce m i ght act ual l y per f or m (e.g., r epeat abi l i t y), cha nges i n t he poi nt of act i on o f t he d evi ce over t i m e (e.g., dr i f t dur i ng su r v ei l l ance i nt er v al s), and an y ot her f act or s whi ch m ay i nf l uenc e i t s ac t ual per f or m ance (e.g., har sh a cc i dent env i r onm ent s). I n t hi s m anner , t he[L T S P] e n s u re s th a t S L s a re n o t e x c e e d e d. A s s u c h , th e [L T S P] m e e ts th e d e f in iti o n o f a n L S S S (R e f. 1). T echn i cal Speci f i cat i ons cont ai n v al ues r el at ed t o t he O PE R AB I LI T Y of e q u ip m e n t re q u ire d f o r s a f e o p e ra tio n o f th e f a c il ity. O P E R A B L E is d e f in e d in T e c h n ic a l S p e c ific a tio n s a s "...b e in g c a p a b le o f p e rf o rm in g its s a f e ty fu n c tio n (s)." U s e o f th e [L T S P] to d e f in e O P E R A B IL IT Y in T e c h n ic a l S p e c ific a tio n s w o u ld b e a n o v e rly re s tric tiv e re q u ire m e n t if it w e re a p p l i e d a s a n O P E R A B I L I T Y l i m i t fo r t h e "a s-fo u n d" va l u e o f a p ro te c tiv e d e v ic e s e ttin g d u rin g a S u rv e il la n c e. T h is w o u ld re s u lt i n T echn i cal Speci f i cat i on c om pl i ance pr obl em s, as we l l as r epor t s an d c o rre c ti v e a c ti o n s re q u i re d b y th e ru l e w h i c h a re n o t n e c e s s a ry to e n s u re saf et y. For ex am pl e, an aut om at i c pr ot ect i v e dev i ce wi t h a s et t i ng t hat has been f ound t o be di f f er ent f r om t he [LT SP] due t o so m e dr i f t of t he s e ttin g m a y s til l b e O P E R A B L E s in c e d rif t is to b e e x p e c te d. T h is ex pect ed dr i f t woul d hav e been spec i f i cal l y acc ount ed f or i n t he s et poi nt m e t h o d o l o g y for ca l c u l a t i n g t h e [L T S P] a n d t h u s t h e a u t o m a t i c p r o t e c t i ve a c tio n w o u ld s til l h a v e e n s u re d th a t th e S L w o u ld n o t b e e x c e e d e d w ith t he " as-f oun d" set t i ng o f t he p r ot ect i v e de v i ce. T her ef or e, t he d evi ce w o u ld s til l b e O P E R A B L E s in c e it w o u ld h a v e p e rf o rm e d its s a f e ty f unct i on and t he onl y cor r ect i v e ac t i on r equi r ed woul d be t o r eset t he d e vi c e t o t h e [L T S P] t o a c c o u n t for f u r t h e r d r i ft d u r i n g t h e n e xt s u rv e il la n c e in te rv a l.
R el i ef and LL S I nst r um ent at i on B 3.3.6.5 BW R/6 ST S B 3.3.6.5-3 R ev. 3.0, 03/31/04 H o w e ve r , t h e r e i s a l s o s o m e p o i n t b e y o n d w h i c h t h e d e vi c e w o u l d h a ve not been a bl e t o per f or m i t s f unct i on due, f or ex am pl e, t o gr eat er t han expect ed d r i f t. T he A l l ow abl e V al ue sp eci f i ed i n S R 3.3.6.5.3 i s t he l east c o n s e r va t i ve va l u e o f t h e a s-fou n d s e t p o i n t t h a t a c h a n n e l c a n h a ve d u rin g te s tin g s u c h th a t a c h a n n e l i s O P E R A B L E if th e trip s e tp o in t is f ound c onse r v at i v e wi t h r espe ct t o t he Al l owabl e Val ue dur i ng t he C H AN N EL C ALI BR AT I O N. N ot e t hat , al t hough a cha nnel i s O PE R AB LE under t hese ci r cum st ance s, t he s et poi nt m ust be l ef t adj ust ed t o a v al ue wi t hi n t he as-l ef t t ol er ance of t he [LT SP] and c onf i r m ed t o be op er at i ng wi t hi n t he s t at i st i cal al l owanc es o f t he unc er t ai nt y t er m s as si gned i n t he s e t p o i n t c a l c u l a t i o n. As s u c h , t h e Al l o w a b l e Va l u e d i f f e r s f r o m t h e [L TSP]b y a n a m o u n t e q u a l to [o r g re a te r th a n] th e a s-f o u n d to le ra n c e v a lu e. In t hi s m anner , t he ac t ual set t i ng of t he dev i ce e nsur es t hat an SL i s no t BAS ES BA C KG R O U N D (cont i nued)ex ceed ed at any gi v en poi nt of t i m e as l ong as t he dev i ce h as n ot dr i f t ed b e yo n d th a t e x p e c te d d u rin g th e s u rv e il la n c e in te rv a l.I f t he a ct ual set t i ng o f t he d evi ce i s f oun d t o be conse r v at i v e w i t h r espe ct t o t he Al l owabl e Val ue but i s be y ond t he as-f ound t ol er ance band, t hen t hi s c ondi t i on i ndi cat es t hat t he i nst r um ent i s de gr aded an d i s no t p e rf o rm in g in a c c o rd a n c e w ith th e s e tp o in t m e th o d o lo g y a s s u m p tio n s. Th i s c o n d i t i o n mu s t b e e n t e r e d i n t o t h e p l a n t c o r r e c t i v e a c t i o n p r o g r a m, t h e t ri p s e t p o i n t m u s t b e l e ft a d j u s t e d t o a va l u e w i t h i n t h e a s-l e ft t ol er ance band, and an i m m edi at e det er m i nat i on of oper abi l i t y dec i si on m u s t b e m a d e. If th e a c tu a l s e ttin g o f th e d e v ic e is f o u n d to b e n o n-c o n s e rv a tiv e w ith r espe ct t o t he Al l owabl e Val ue, t he dev i ce c hannel woul d be c onsi der ed i noper abl e f r om a T echn i cal Speci f i cat i on per spec t i v e. T hi s r equi r es cor r ect i v e ac t i on i ncl udi ng t hose act i ons r equi r ed by 10 CF R 50.36 when aut om at i c pr ot ect i v e dev i ces do not f unct i on as r equi r ed.T he r el i ef f unct i on of t he S/R Vs pr ev ent s ov er pr ess ur i z at i on of t he n u c le a r s te a m s ys te m. T h e L L S f u n c tio n o f th e S/R V s is d e s ig n e d to m i t i gat e t he ef f ect s of pos t ul at ed t hr ust l oads on t he S/R V di sc har ge l i nes by pr ev ent i ng s ubse quent act uat i ons wi t h an el ev at ed wat er l eg i n t he S/R V d i s c h a rg e l i n e. I t a l s o m i ti g a te s th e e ff e c ts o f p o s tu l a te d p re s s u re lo a d s o n th e c o n ta in m e n t b y p re v e n tin g m u lti p le a c tu a tio n s in ra p id suc ces si on of t he S/R Vs subs equent t o t hei r i ni t i al act uat i on.U pon any S/R V act uat i on, t he LLS l ogi c as si gns pr eset openi ng and re c l o s i n g s e tp o i n ts to s i x p re s e l e c te d S/R V s. T h e s e s e tp o i n ts a re s e l e c t e d t o o v e r r i d e t h e n o r m a l r e l i e f s e t p o i n t s s u c h t h a t t h e L L S S/RVs wi l l st ay open l onger , t hus r el easi ng m or e st eam (ener gy) t o t he R el i ef and LL S I nst r um ent at i on B 3.3.6.5 BW R/6 ST S B 3.3.6.5-4 R ev. 3.0, 03/31/04 supp r ess i on pool; henc e m or e ener gy (and t i m e) i s r equi r ed f or re p re s s u riza tio n a n d s u b s e q u e n t S/R V o p e n in g s. T h e L L S lo g ic i ncr ease s t he t i m e bet ween (or pr ev ent s) sub sequ ent act uat i ons t o al l ow th e h ig h w a te r le g c re a te d f ro m th e in iti a l S/R V o p e n in g to re tu rn to (o r f a ll bel ow) i t s no r m al wat er l ev el , t hus r educ i ng t hr ust l oads f r om sub sequ ent a c tu a tio n s to w ith in th e ir d e s ig n li m its. In a d d iti o n , th e L L S is d e s ig n e d to l i m i t S/R V subse quent act uat i ons t o one v al v e, so t hat con t ai nm ent l oads wi l l al so b e r educ ed.T h e re li e f in s tru m e n ta tio n c o n s is ts o f tw o trip s ys te m s , w ith e a c h trip sy st em act uat i ng one sol enoi d f or eac h S/R V. T her e ar e t wo sol enoi ds per S/R V, and ea ch s ol enoi d ca n open i t s r espe ct i v e S/R V. T he r el i ef m ode (S/R Vs and as soc i at ed t r i p sy st em s) i s di v i ded i nt o t hr ee s et poi nt gr oups (t he l ow wi t h one S/R V, t he m edi um wi t h 10 S/R Vs, and t he hi gh wi t h ni ne S/R Vs). T he S/R V r el i ef f unct i on i s ac t uat ed by t r ansm i t t er s t hat m o n i to r re a c to r s te a m d o m e p re s s u re. T h e re a c to r s te a m d o m e p re s s u re t r ansm i t t er s s end s i gnal s t o t r i p uni t s whos e out put s ar e ar r anged i n a t wo-out-of-t wo l ogi c f or eac h t r i p sy st em i n eac h of t hr ee s epar at e R el i ef and LL S I nst r um ent at i on B 3.3.6.5 BW R/6 ST S B 3.3.6.5-5 R ev. 3.0, 03/31/04 BAS ES BA C KG R O U N D (cont i nued)set poi nt gr oup s (e.g., t he m edi um gr oup of 10 S/R V s ope ns w hen at l east one of t he as soc i at ed t r i p sy st em s t r i ps a t i t s as si gned s et poi nt). O nce an S/R V h a s b e e n o p e n e d , i t w i l l re c l o s e w h e n re a c to r s te a m d o m e p re s s u re decr ease s be l ow t he open i ng pr ess ur e se t poi nt. T hi s l ogi c ar r angem ent ensu r es t hat no s i ngl e i nst r um ent f ai l ur e ca n pr ecl ude t he S/R V r el i ef f unct i on.T he LLS l ogi c c onsi st s of t wo t r i p sy st em s s i m i l ar t o t he S/R V r el i ef f unct i on. Ei t her t r i p sy st em can act uat e t he LLS S/R Vs by ener gi z i ng t he a s s o c ia te d s o le n o id s o n th e S/R V p il o t v a lv e s. E a c h L L S trip s ys te m is enabl ed and seal ed i n upon i ni t i al S/R V act uat i on f r om t he ex i st i ng r eact or st eam dom e pr ess ur e se nsor s of any of t he nor m al r el i ef set poi nt g ro u p s. T h e re a c to r s te a m d o m e p re s s u re c h a n n e l s u s e d to a rm L L S a re a r r a n g e d i n a o n e-o u t-o f-t h r e e t a k e n t w i c e l o g i c. T h e r e a c t o r s t e a m d o me p r e s s u r e c h a n n e l s t h a t c o n t r o l t h e o p e n i n g a n d c l o s i n g o f t h e L L S S/RVs a re a rra n g e d in e ith e r a o n e-o u t-o f-o n e o r a tw o-o u t-o f-tw o lo g ic d e p e n d in g o n w h ic h L L S S/R V g ro u p is b e in g c o n tro ll e d. T h is lo g ic ar r angem ent ens ur es t hat no s i ngl e i nst r um ent f ai l ur e ca n pr ecl ude t he L L S S/R V f u n c tio n. T h e c h a n n e ls in c lu d e e le c tro n ic e q u ip m e n t (e.g., trip uni t s) t hat com par es m easu r ed i nput si gnal s wi t h pr e-est abl i shed set poi nt s. W hen t he s et poi nt i s ex ceed ed, t he c hannel out put r el ay act uat es, whi ch t hen out put s a L LS or r el i ef i ni t i at i on s i gnal , as a ppl i cabl e, t o t he i ni t i at i on l ogi c.AP PLI C AB LE T he r el i ef and LL S i nst r um ent at i on ar e des i gned t o pr ev ent SA FE T Y ov er pr ess ur i z at i on of t he nuc l ear st eam sy st em and t o ens ur e t hat t he A N A L Y S E S c o n ta in m e n t lo a d s re m a in w ith in th e p rim a ry c o n ta in m e n t d e s ig n b a s is (R e f. 1).R el i ef and LL S i nst r um ent at i on s at i sf i es Cr i t er i on 3 of 1 0 C F R 5 0.3 6 (c)(2)(i i).T r i p Set poi nt s t hat di r ect l y pr ot ect agai nst v i ol at i ng t he r eact or cor e or R eact or C ool ant Sy st em (R C S) pr ess ur e bound ar y Saf et y Li m i t s du r i ng ant i ci pat ed oper at i onal occ ur r ence s (AO O s) ar e Saf et y Li m i t-Li m i t i ng S a f e ty S ys te m S e ttin g s (S L-L S S S). P e rm is s iv e a n d in te rlo c k s e tp o in ts a ll o w b yp a s s o f trip s w h e n th e y a re n o t re q u ire d b y th e S a f e ty A n a ly s is. T h e s e p e rm i s s i v e s a n d i n te rl o c k s e n s u re th a t t h e s ta rti n g c o n d i ti o n s a re cons i st ent wi t h t he s af et y anal y si s, bef or e pr ev ent at i v e or m i t i gat i ng act i ons occ ur. Becaus e t hese per m i ss i v es o r i nt er l ock s ar e onl y one of m ul t i pl e co nser v at i v e st ar t i ng as sum pt i ons f or t he ac ci dent anal y si s, t hey a re g e n e ra ll y c o n s id e re d a s n o m in a l v a lu e s w ith o u t re g a rd to m easu r em ent acc ur acy , (i.e. t he v al ue i ndi cat ed i s s uf f i ci ent l y cl ose t o t he n e c e s s a ry v a l u e to e n s u re p ro p e r o p e ra ti o n o f th e s a fe ty s y s te m s to tu rn t he AO O). T her ef or e per m i ss i v es a nd i nt er l ock s ar e not con si der ed t o be SL-L SSS.
R el i ef and LL S I nst r um ent at i on B 3.3.6.5 BW R/6 ST S B 3.3.6.5-6 R ev. 3.0, 03/31/04 LC O T he LCO r equi r es OP ER AB I LI T Y of suf f i ci ent r el i ef and LL S in s tru m e n ta tio n c h a n n e ls to p ro v id e a d e q u a te a s s u ra n c e o f s u c c e s s f u ll y a c c o m p li s h in g th e re li e f a n d L L S f u n c tio n , a s s u m in g a n y s in g le in s tru m e n ta tio n c h a n n e l fa il u re w ith in th e L L S lo g ic. T h e re f o re , tw o trip s ys te m s a re re q u ire d to b e O P E R A B L E. T h e O P E R A B IL IT Y o f e a c h trip s y s t e m i s d e p e n d e n t u p o n t h e OP E R A B I L I TY o f t h e r e a c t o r s t e a m d o me pr essur e cha nne l s associ at ed w i t h r equ i r ed r el i ef and LLS S/R V s. E ach re q u ire d c h a n n e l s h a ll h a v e its s e tp o in t w ith in c o n s e rv a tiv e w ith re s p e c t to th e s p e c ifie d A ll o w a b le V a lu e. A c h a n n e l i s in o p e ra b le if its a c tu a l trip s e tp o in t is n o t w ith in c o n s e rv a tiv e w ith re s p e c t to its re q u ire d A ll o w a b le V a lu e. T h e a c tu a l s e tp o in t is c a li b ra te d c o n s is te n t w ith a p p li c a b le set poi nt m et hod ol ogy assum pt i ons.
R el i ef and LL S I nst r um ent at i on B 3.3.6.5 BW R/6 ST S B 3.3.6.5-7 R ev. 3.0, 03/31/04 BAS ES LC O (cont i nued)Al l owabl e Val ues ar e sp eci f i ed f or eac h ch annel i n SR 3.3.6.5.3. [Li m i t i ng Tr i p Se t po i nt s] ar e s pe c i f i ed [i n a do c ument c on t r ol l ed un de r 10 CFR 5 0.5 9]. N o m in a l trip s e tp o in ts a re s p e c ifie d in th e s e tp o in t c a lc u la tio n s. T he nom i nal set poi nt s ar e se l ect ed t o ens ur e t hat t he s et poi nt s do not ex ceed r em ai n co nser v at i v e wi t h r espe ct t o t he as-l ef t t ol er ance band A l l ow abl e V al ue b et we en C H A N N E L C A LI B R A T I O N S. . A f t er each cal i br at i on t he t r i p se t poi nt sho ul d be r eset t o wi t hi n t he as-l ef t band a ro u n d th e [L T S P] T h e A l l o w a b l e V a l u e s p e c i fi e d i n T a b l e 3.3.5.2-1 i s t h e l e a s t c o n s e r va t i ve v al ue of t he as-f ound s et poi nt t hat t he c hannel can hav e when t est ed, s u c h t h a t a c h a n n e l i s O P E R A B L E i f t h e a s-fou n d s e t p o i n t i s c o n s e r va t i ve w ith re s p e c t to th e A ll o w a b le V a lu e d u rin g th e C H A N N E L C A L IB R A T IO N. As suc h, t he Al l owabl e Val ue di f f er s f r om t he [LT SP] by an am ount[gr eat er t han or] equ al t o t he e x pect ed i nst r um ent chan nel unce r t ai nt i es, suc h as dr i f t , dur i ng t he s ur v ei l l ance i nt er v al. I n t hi s m anner , t he ac t ual set t i ng of t he dev i ce ([LT SP]) wi l l ens ur e t hat a SL i s no t ex ceed ed at any gi v en poi nt of t i m e as l ong as t he dev i ce h as n ot dr i f t ed bey ond t hat e x p e c te d d u ri n g th e s u rv e i l l a n c e i n te rv a l. T h e s e u n c e rta i n ti e s a re d e s c r ib e d in th e s e tp o in t m e th o d o lo g y.N ot e t hat , al t hou gh t he ch ann el i s O P E R A B LE und er t hese ci r cum st ance s, t he t r i p se t poi nt m ust be l ef t adj ust ed t o a v al ue wi t hi n t he a s-le f t to le ra n c e , in a c c o rd a n c e w ith u n c e rta in ty a s s u m p tio n s s ta te d in t he r ef er ence d se t poi nt m et hodol ogy (as-l ef t cr i t er i a), and c onf i r m ed t o be o p e ra ti n g w i th i n th e s ta ti s ti c a l a l l o w a n c e s o f th e u n c e rta i n ty te rm s a s s ig n e d (a s-f o u n d c rite ria). I f t he a ct ual set t i ng o f t he d evi ce i s f oun d t o be conse r v at i v e w i t h r espe ct t o t he Al l owabl e Val ue but i s be y ond t he as-f ound t ol er ance band, t hen t hi s c ondi t i on i ndi cat es t hat t he i nst r um ent i s de gr aded an d i s no t p e rf o rm in g in a c c o rd a n c e w ith th e s e tp o in t m e th o d o lo g y a s s u m p tio n s. Th i s c o n d i t i o n mu s t b e e n t e r e d i n t o t h e p l a n t c o r r e c t i v e a c t i o n p r o g r a m, t h e t ri p s e t p o i n t m u s t b e l e ft a d j u s t e d t o a va l u e w i t h i n t h e a s-l e ft t ol er ance band, and an i m m edi at e det er m i nat i on of oper abi l i t y dec i si on m u s t b e m a d e. If th e a c tu a l s e ttin g o f th e d e v ic e is f o u n d to b e n o n-c o n s e rv a tiv e w ith r espe ct t o t he Al l owabl e Val ue, t he c hannel woul d be c onsi der ed i noper abl e. T hi s r equi r es c or r ect i v e ac t i on i ncl udi ng t hose act i ons r equi r ed by 10 CF R 50.36 when a ut om at i c pr ot ect i v e dev i ces do not f unct i on as r equi r ed.
R el i ef and LL S I nst r um ent at i on B 3.3.6.5 BW R/6 ST S B 3.3.6.5-8 R ev. 3.0, 03/31/04[LT SP s] ar e t hose pr edet er m i ned v al ues of out put at whi ch a n ac t i on shou l d t ake p l ace. T he se t poi nt s ar e com par ed t o t he a ct ual pr ocess par am et er (e.g., r eact or v ess el wat er l ev el), and when t he BAS ES AP PLI C AB LE S AF ET Y AN ALY SE S, LC O , and APP LI C AB I LI T Y (cont i nued)m e a s u re d o u tp u t v a lu e o f th e p ro c e s s p a ra m e te r e x c e e d s th e s e tp o in t, th e a s s o c ia te d d e v ic e (e.g., trip u n it) c h a n g e s s ta te. T h e a n a ly tic a l l im its ar e der i v ed f r om t he l i m i t i ng v al ues of t he pr oces s pa r am et er s ob t ai ned f r om t he s af et y anal y si s. T he Al l owabl e Val ues ar e der i v ed f r om t he anal y t i cal l i m i t s, cor r ect ed f or cal i br at i on, pr oces s, and s om e of t he i nst r um ent er r or s. T he [LT SP s] ar e t hen det er m i ned, acc ount i ng f or t he re m a in in g in s tru m e n t e rro rs (e.g., d rif t). T h e trip s e tp o in ts d e riv e d in th is m anner pr ov i de adeq uat e pr ot ect i on bec ause i nst r um ent at i on unce r t ai nt i es, pr oces s ef f ect s, cal i br at i on t ol er ance s, i nst r um ent dr i f t , and sever e en v i r onm ent er r or s (f or chan nel s t hat m ust f unct i on i n ha r sh e n v i ro n m e n ts a s d e fin e d b y 1 0 C F R 5 0.4 9) a re a c c o u n te d fo r.O p e ra tio n w ith a trip s e tp o in t le s s c o n s e rv a tiv e th a n th e n o m in a l trip s e tp o in t, b u t w ith in c o n s e rv a tiv e w ith re s p e c t to its A ll o w a b le V a lu e , is acc ept abl e.T r i p se t poi nt[Li m i t i ng T r i p Set poi nt s]s ar e t hose pr edet er m i ned v al ues of out put at whi ch a n ac t i on s houl d t ake pl ace. T he s et poi nt s ar e co m par ed t o t he ac t ual pr oces s pa r am et er (e.g., r eact or v ess el pr ess ur e), and when t he m easu r ed out put v al ue of t he pr oces s pa r am et er ex ceed s t he set poi nt , t he as soc i at ed dev i ce (e.g., t r i p uni t) cha nges st at e. T he ana l y t i cana l y t i cal l i m i t s ar e de r i v ed f r om t he l i m i t i ng val ues o f t he p r ocess p a ra m e te rs o b ta i n e d fro m th e s a fe ty a n a l y s i s. T h e A l l o w a b l e V a l u e s a re der i v ed f r om t he anal y t i cana l y t i cal l i m i t s, cor r ect ed f or cal i br at i on, pr ocess, and som e of t he i nst r um ent er r or s. T he t r i p set poi nt s[LT S P s]a re th e n d e te rm in e d , a c c o u n tin g f o r th e re m a in in g in s tru m e n t e rro rs (e.g., d rif t). T h e trip s e tp o in ts d e riv e d in th is m a n n e r p ro v id e a d e q u a te pr ot ect i on b ecau se i nst r um ent at i on u ncer t ai nt i es, pr ocess e f f ect s, cal i br at i on t ol er ance s, i nst r um ent dr i f t , and s ev er e env i r onm ent er r or s (f or chan nel s t hat m ust f unct i on i n har sh e nv i r onm ent s as def i ned by 1 0 C F R 5 0.4 9) a re a c c o u n te d fo r.For r el i ef , t he ac t uat i ng Al l owabl e Val ues ar e bas ed on t he t r ansi ent ev ent of m ai n st eam i sol at i on v al v e (M SI V) cl osur e wi t h an i ndi r ect sc r am (i.e., n e u t r o n f l u x). Th i s a n a l y s i s i s d e s c r i b e d i n Re f e r e n c e 2. F o r L L S, t he ac t uat i ng and r ecl osi ng Al l owabl e Val ues ar e bas ed on t he t r ansi ent e v e n t o f M S IV c lo s u re w ith a d ire c t s c ra m (i.e., M S IV p o s iti o n s w itc h e s). T hi s an al y si s i s de sc r i bed i n R ef er ence 1.A P P L IC A B IL IT Y T h e re li e f a n d L L S in s tru m e n ta tio n is re q u ire d to b e O P E R A B L E in M O D ES 1, 2, and 3, si nce cons i der abl e ener gy ex i st s i n t he nuc l ear s te a m s ys te m a n d th e S/R V s m a y b e n e e d e d to p ro v id e p re s s u re re li e f. If th e S/R V s a re n e e d e d , th e n th e re li e f a n d L L S f u n c tio n s a re re q u ire d to e n s u re th a t th e p rim a ry c o n ta in m e n t d e s ig n b a s is is m a in ta in e d. In R el i ef and LL S I nst r um ent at i on B 3.3.6.5 BW R/6 ST S B 3.3.6.5-9 R ev. 3.0, 03/31/04 M O D ES 4 and 5 , t he r eact or pr ess ur e i s l ow enoug h t hat t he ov er pr ess ur e l i m i t can not be app r oach ed by ass um ed oper at i onal t r ansi ent s or acc i dent s. T hus, pr ess ur e r el i ef , ass oci at ed r el i ef , and LL S i nst r um ent at i on ar e not r equi r ed.A C T IO N S
R E V IE W E R'S N O T E-----------------------------------C e rta in L C O C o m p le tio n T im e s a re b a s e d o n a p p ro v e d to p ic a l re p o rts. In or der f or a l i cens ee t o us e t he t i m es, t he l i cens ee m ust j ust i f y t he C o m p l e ti o n T i m e s a s re q u i re d b y th e s ta ff S a fe ty E v a l u a ti o n R e p o rt (S E R) f o r th e to p ic a l re p o rt.--------------------------------------------------------------------------------------------------
R el i ef and LL S I nst r um ent at i on B 3.3.6.5 BW R/6 ST S B 3.3.6.5-10 R ev. 3.0, 03/31/04 BAS ES AC T I O N S (cont i nued)A.1 Because t he f ai l ur e of any r eact or st eam dom e pr ess ur e i nst r um ent chan nel s [pr ov i di ng r el i ef S/R V openi ng and LLS openi ng and cl osi ng pr ess ur e se t poi nt s] i n one t r i p sy st em wi l l not pr ev ent t he as soc i at ed S/R V f ro m p e rf o rm in g its re li e f a n d L L S f u n c tio n , 7 d a ys is a ll o w e d to r est or e a t r i p sy st em t o O PE R AB LE st at us. I n t hi s c ondi t i on, t he r em ai ni ng O PE R AB LE t r i p sy st em i s ad equat e t o per f or m t he r el i ef and LLS i ni t i at i on f unct i on. H ow ever , t he o v er al l r el i abi l i t y i s r edu ced b ecau se a si ngl e f ai l ur e i n t he O PE R AB LE t r i p sy st em cou l d r esul t i n a l oss of r el i ef or LLS f unct i on.T he 7 da y C om pl et i on T i m e i s c onsi der ed appr opr i at e f or t he r el i ef and LLS f unct i on bec ause of t he r edunda ncy of sen sor s av ai l abl e t o pr ov i de in iti a tio n s ig n a ls a n d th e re d u n d a n c y o f th e re li e f a n d L L S d e s ig n. In addi t i on, t he pr obabi l i t y of m ul t i pl e r el i ef or LLS i nst r um ent at i on c hannel f ai l ur es, whi ch r ender s t he r em ai ni ng t r i p sy st em i noper abl e, occ ur r i ng t oget her wi t h an ev ent r equi r i ng t he r el i ef or LLS f unct i on dur i ng t he 7 da y Com pl et i on Ti m e i s v er y l ow.B.1 a n d B.2 If th e in o p e ra b le trip s ys te m is n o t re s to re d to O P E R A B L E s ta tu s w ith in 7 day s, per C ondi t i on A, or i f t wo t r i p sy st em s ar e i noper abl e, t hen t he p l a n t mu s t b e b r o u g h t t o a MOD E i n w h i c h t h e L CO d o e s n o t a p p l y. To a c h ie v e th is s ta tu s , th e p la n t m u s t b e b ro u g h t to a t le a s t M O D E 3 w ith in 12 h our s and t o M O D E 4 wi t hi n 36 hou r s.T he al l owed Com pl et i on T i m es a r e r easo nabl e, bas ed on o per at i ng ex per i ence , t o r each t he r equi r ed pl ant con di t i ons f r om f ul l power cond i t i ons i n an or der l y m ann er and wi t hou t chal l eng i ng p l ant sy st em s.S U R V E IL L A N C E
R E V IE W E R'S N O T E-----------------------------------R E Q U IR E M E N T S C e rta i n F re q u e n c i e s a re b a s e d o n a p p ro v e d to p i c a l re p o rts. I n o rd e r fo r a l i cens ee t o us e t hese Fr equenc i es, t he l i cens ee m ust j ust i f y t he F re q u e n c ie s a s re q u ire d b y th e s ta f f S E R f o r th e to p ic a l re p o rt.---------------------------------------------------------------------------------------------------------------------------------- R E V IE W E R'S N O T E ------------------------------------T he Not es i n SR 3.3.6.5.2 and SR 3.3.6.5.3 r equi r i ng r eset of t he c hannel t o a pr edef i ned as-l ef t t ol er ance and t he v er i f i cat i on of t he as-f ound t ol er ance ar e on l y associ at ed w i t h S L-LS S S v al ues.---------------------------------------------------------------------------------------------------------------------------------- R E V IE W E R'S N O T E ------------------------------------
R el i ef and LL S I nst r um ent at i on B 3.3.6.5 BW R/6 ST S B 3.3.6.5-11 R ev. 3.0, 03/31/04 N o te s 1 a n d 2 a re a p p li e d to th e s e tp o in t v e rif ic a tio n S u rv e il la n c e s f o r a ll S L-L S S S F u n c tio n s u n le s s o n e o r m o r e o f th e f o llo w in g e x c lu s io n s a p p ly: 1.
N o te s 1 a n d 2 a re n o t a p p l i e d to S L-L S S S F u n c ti o n s w h i c h u ti l i ze m echa ni cal com ponent s t o se nse t he t r i p se t poi nt or t o m anual i ni t i at i on c i r cui t s (t he l at t er ar e not ex pl i ci t l y m odel ed i n t he ac ci dent ana l y si s). E x am pl es of m echa ni cal com pon ent s ar e l i m i t swi t ches, f l oat swi t ches , pr ox i m i t y det ect or s, m anual act uat i on s wi t ches , and ot her suc h dev i ces t hat ar e nor m al l y onl y che ck ed on a " go/no go" basi s. N ot e 1 r equ i r es a co m par i son o f t he p er i odi c sur v ei l l ance r equi r em ent r esul t s t o pr ov i de an i ndi cat i on of cha nnel (or i ndi v i dual devi ce) per f or m ance. T hi s com par i son i s not v al i d f or m ost m e c h a n ic a l c o m p o n e n ts. W h il e it i s p o s s ib le to v e rif y th a t a li m it s w itc h f u n c tio n s a t a p o in t o f tra v e l, a c h a n g e in th e s u rv e il la n c e re s u lt pr obabl y i ndi cat es t hat t he s wi t ch h as m ov ed, not t hat t he i nput/out put r el at i onsh i p ha s chan ged. T her ef or e, a com par i son o f sur v ei l l ance r equi r em ent r esul t s woul d not pr ov i de an i ndi cat i on of t he c hannel or com ponent per f or m ance.2.
N ot es 1 and 2 a r e not appl i ed t o T echn i cal Speci f i cat i ons ass oci at ed wi t h m echa ni cal l y oper at ed s af et y r el i ef v al v es. T he per f or m ance of t hese com ponent s i s al r eady con t r ol l ed (i.e., t r ended wi t h as-l ef t and a s-f o u n d l i mi t s) u n d e r t h e A S M E S e c t i o n X I t e s t i n g p r o g r a m.3.
N ot es 1 and 2 a r e m ay not appl y i ed t o SL-LSS S F unct i ons and Sur v ei l l ance s whi ch t est onl y di gi t al com ponent s. For pur el y di gi t al com pon ent s, such a s act uat i on l ogi c ci r cui t s and associ at ed r el ay s, t her e i s no e x pect ed ch ang e i n r esul t bet we en su r v ei l l ance per f or m ance s ot her t han m easu r em ent and t est er r or s (M&T E) and, t her ef or e, j ust i f i cat i on i s ne eded t o co nf i r m t hat com par i son of Sur v ei l l ance r esul t s do es n ot pr ov i de an i ndi cat i on of cha nnel or com ponent per f or m ance.An ev al uat i on of t he pot ent i al SL-LSS S F unct i ons r esul t ed i n N ot es 1 and 2 be i ng a ppl i ed t o t he F unct i ons sh ow n i n t he T S m ar kups. E ach li c e n s e e p ro p o s in g to f u ll y a d o p t th is T S T F m u s t re v ie w th e th e p o te n tia l SL-LSS S F unct i ons t o i dent i f y whi ch o f t he i dent i f i ed f unct i ons ar e SL-L S S S a c c o rd in g to th e d e f in iti o n o f S L-L S S S a n d th e ir p la n t s p e c ific saf et y anal y si s. T he t wo T ST F N ot es a r e not r equi r ed t o be ap pl i ed t o any of t he l i st ed Func t i ons whi ch m eet any of t he ex cl usi on c r i t er i a or ar e not S L-LS S S base d on t he p l ant speci f i c desi gn a nd a nal y si s.--------------------------------------------------------------------------------------------------T he Sur v ei l l ance s ar e m odi f i ed by a Not e t o i ndi cat e t hat when a c hannel i s pl aced i n an i noper abl e st at us s ol el y f or per f or m ance of r equi r ed Sur v ei l l ance s, ent r y i nt o as soc i at ed Condi t i ons and Requi r ed Act i ons m ay be del ay ed f or up t o 6 hou r s, pr ov i ded t he as soc i at ed Func t i on m ai nt ai ns r el i ef or LLS i ni t i at i on c apabi l i t y , as a ppl i cabl e. U pon c om pl et i on of t he R el i ef and LL S I nst r um ent at i on B 3.3.6.5 BW R/6 ST S B 3.3.6.5-12 R ev. 3.0, 03/31/04 BAS ES SU R VE I LLAN C E R EQ U I R EM EN T S (cont i nued)Sur v ei l l ance , or ex pi r at i on of t he 6 ho ur al l owanc e, t he c hannel m ust be r et ur ned t o O PE R AB LE st at us o r t he appl i cabl e C ondi t i on ent er ed and R e q u ire d A c tio n s ta k e n. T h is N o te is b a s e d o n th e re li a b il ity a n a ly s is (R ef. 3) ass um pt i on of t he av er age t i m e r equi r ed t o per f or m cha nnel sur v ei l l ance. T hat ana l y si s dem onst r at ed t he 6 hou r t est i ng a l l ow ance does not si gni f i cant l y r educ e t he pr obabi l i t y t hat t he r el i ef and LL S v al v es w ill in itia te w h e n n e c e s s a r y.S R 3.3.6.5.1 A C H AN N EL FU N C T I O N AL T ES T i s pe r f or m ed on e ach r equi r ed c hannel to e n s u re th a t th e e n tire c h a n n e l w il l p e rf o rm th e in te n d e d f u n c tio n. A suc ces sf ul t est of t he r equi r ed c ont act (s) of a ch annel r el ay m ay be per f or m ed by t he v er i f i cat i on of t he c hange o f st at e of a si ngl e co nt act of t h e r e l a y. Th i s c l a r i f i e s w h a t i s a n a c c e p t a b l e CHANNEL FUNCTI ONAL T ES T of a r el ay. T hi s i s ac cept abl e bec ause al l of t he ot her r equi r ed cont act s of t he r el ay ar e v er i f i ed by ot her T echn i cal Speci f i cat i ons and n o n-T e c h n ic a l S p e c ific a tio n s te s ts a t le a s t o n c e p e r re f u e li n g in te rv a l w ith a p p li c a b le e x te n s io n s. A n y s e tp o in t a d ju s tm e n t s h a ll b e c o n s is te n t w ith th e a s s u m p tio n s o f th e c u r r e n t p la n t s p e c if ic s e tp o in t m e th o d o lo g y.T he Fr equenc y of 92 day s i s ba sed on t he r el i abi l i t y anal y si s of R ef er ence 3.S R 3.3.6.5.2 T h e c a li b ra tio n o f trip u n its p ro v id e s a c h e c k o f th e a c tu a l trip s e tp o in ts. T he c hannel m ust be dec l ar ed i noper abl e i f t he t r i p se t t i ng i s di sc ov er ed to b e le s s c o n s e rv a tiv e th a n th e A ll o w a b le V a lu e s p e c ifie d in SR 3.3.6.5.3. I f t he t r i p se t t i ng i s di sc ov er ed t o be l ess con ser v at i v e t han acc ount ed f or i n t he appr opr i at e se t poi nt m et hodol ogy but i s no t bey ond t he Al l owabl e Val ue, t he c hannel per f or m ance i s s t i l l wi t hi n t he r equi r em ent s of t he pl ant saf et y anal y si s. U nder t hese con di t i ons, t he set poi nt m ust be r eadj ust ed t o be eq ual t o or m or e co nser v at i v e t han a c c o u n te d f o r in th e a p p r o p r ia te s e tp o in t m e th o d o lo g y.T he Fr equenc y of 92 day s i s ba sed on t he r el i abi l i t y anal y si s of R ef er ence 3. S R 3.3.6.5.2 f or S L-LS S S f unct i ons i s m odi f i ed b y t wo N ot es. T he f i r st N o te re q u i re s e v a l u a ti o n o f c h a n n e l p e rfo rm a n c e fo r th e c o n d i ti o n w h e re t he as-f ound s et t i ng f or t he c hannel set poi nt i s ou t si de i t s as-f ound to le ra n c e b u t c o n s e rv a tiv e w ith re s p e c t to th e A ll o w a b le V a lu e. E v a lu a tio n o f in s tru m e n t p e rf o rm a n c e w il l v e rif y th a t th e in s tru m e n t w il l R el i ef and LL S I nst r um ent at i on B 3.3.6.5 BW R/6 ST S B 3.3.6.5-13 R ev. 3.0, 03/31/04 cont i nue t o behav e i n ac cor danc e wi t h sa f et y anal y si s s et poi nt m e th o d o l o g y a s s u m p ti o n s. T h e p u rp o s e o f th e a s s e s s m e n t i s to e n s u re conf i denc e i n t he i nst r um ent per f or m ance pr i or t o r et ur ni ng t he i nst r um ent t o se r v i ce. T hese cha nnel s wi l l al so b e i dent i f i ed i n t he Cor r ect i v e Act i on Pr ogr am. Ent r y i nt o t he Cor r ect i v e Act i on Pr ogr am wi l l ens ur e r equi r ed re v ie w a n d d o c u m e n ta tio n o f th e c o n d iti o n f o r c o n tin u e d O P E R A B IL IT Y. T he s econ d N ot e r equi r es t hat t he as-l ef t set t i ng f or t he i nst r um ent be r et ur ned t o wi t hi n t he as-l ef t t ol er ance of t he [LT SP]. W her e a s et poi nt m or e con ser v at i v e t han t he [LT S P] i s used i n t he p l ant sur v ei l l ance pr oced ur es, t he as-l ef t and as-f ound t ol er ance s, as a ppl i cabl e, wi l l be appl i ed t o t he s ur v ei l l ance pr oced ur e se t poi nt. T hi s wi l l ens ur e t hat s u f f ic ie n t m a rg in to th e S a f e ty L im it a n d/o r A n a ly tic a l L im it i s m a in ta in e d. I f t he as-l ef t i nst r um ent set t i ng c annot be r et ur ned t o a s et t i ng wi t hi n t he as-l ef t t ol er ance of t he [LT SP], t hen t he i nst r um ent cha nnel sha l l be decl ar ed i noper abl e.T he s econ d N ot e al so r equi r es t hat [LT SP] and t he m et hodol ogi es f or cal cul at i ng t he as-l ef t and t he as-f ound t ol er ance s be i n [a doc um ent c o n tro ll e d u n d e r 1 0 C F R 5 0.5 9].
R el i ef and LL S I nst r um ent at i on B 3.3.6.5 BW R/6 ST S B 3.3.6.5-14 R ev. 3.0, 03/31/04 BAS ES SU R VE I LLAN C E R EQ U I R EM EN T S (cont i nued)S R 3.3.6.5.3 A C H AN N EL C ALI BR AT I O N i s a c om pl et e ch eck of t he i nst r um ent l oop and t he s enso r. T hi s t est v er i f i es t he c hannel r espo nds t o t he m easu r ed p a r a m e t e r w i t h i n t h e n e c e s s a r y r a n g e a n d a c c u r a c y. CHANNEL C ALI BR AT I O N l eav es t he c hannel adj ust ed t o ac coun t f or i nst r um ent d rif ts b e tw e e n s u c c e s s iv e c a li b ra tio n s c o n s is te n t w ith th e p la n t s p e c ific s e tp o in t m e th o d o lo g y.T he Fr equenc y i s ba sed upon t he as sum pt i on of an 18 m ont h ca l i br at i on i nt er v al i n t he det er m i nat i on of t he m agni t ude of equi pm ent dr i f t i n t he set poi nt ana l y si s.S R 3.3.6.5.3 f or S L-LS S S f unct i ons i s m odi f i ed b y t wo N ot es. T he f i r st N o te re q u i re s e v a l u a ti o n o f c h a n n e l p e rfo rm a n c e fo r th e c o n d i ti o n w h e re t he as-f ound s et t i ng f or t he c hannel set poi nt i s ou t si de i t s as-f ound to le ra n c e b u t c o n s e rv a tiv e w ith re s p e c t to th e A ll o w a b le V a lu e. E v a lu a tio n o f in s tru m e n t p e rf o rm a n c e w il l v e rif y th a t th e in s tru m e n t w il l cont i nue t o behav e i n ac cor danc e wi t h sa f et y anal y si s s et poi nt m e th o d o l o g y a s s u m p ti o n s. T h e p u rp o s e o f th e a s s e s s m e n t i s to e n s u re conf i denc e i n t he i nst r um ent per f or m ance pr i or t o r et ur ni ng t he i nst r um ent t o se r v i ce. T hese cha nnel s wi l l al so b e i dent i f i ed i n t he Cor r ect i v e Act i on Pr ogr am. Ent r y i nt o t he Cor r ect i v e Act i on Pr ogr am wi l l ens ur e r equi r ed re v ie w a n d d o c u m e n ta tio n o f th e c o n d iti o n f o r c o n tin u e d O P E R A B IL IT Y. T he s econ d N ot e r equi r es t hat t he as-l ef t set t i ng f or t he i nst r um ent be r et ur ned t o wi t hi n t he as-l ef t t ol er ance of t he [LT SP]. W her e a s et poi nt m or e con ser v at i v e t han t he [LT S P] i s used i n t he p l ant sur v ei l l ance pr oced ur es, t he as-l ef t and as-f ound t ol er ance s, as a ppl i cabl e, wi l l be appl i ed t o t he s ur v ei l l ance pr oced ur e se t poi nt. T hi s wi l l ens ur e t hat s u f f ic ie n t m a rg in to th e S a f e ty L im it a n d/o r A n a ly tic a l L im it i s m a in ta in e d. I f t he as-l ef t i nst r um ent set t i ng c annot be r et ur ned t o a s et t i ng wi t hi n t he as-l ef t t ol er ance of t he [LT SP], t hen t he i nst r um ent cha nnel sha l l be decl ar ed i noper abl e.T he s econ d N ot e al so r equi r es t hat [LT SP] and t he m et hodol ogi es f or cal cul at i ng t he as-l ef t and t he as-f ound t ol er ance s be i n [a doc um ent c o n tro ll e d u n d e r 1 0 C F R 5 0.5 9].S R 3.3.6.5.4 T he LO G I C SYST EM FU N C T I O N AL T ES T dem onst r at es t he O PE R AB I LI T Y of t he r equi r ed ac t uat i on l ogi c f or a sp eci f i c c hannel. T he sy st em f unct i onal t est i ng per f or m ed f or S/R Vs i n LCO 3.4.4 and LC O 3.6.1.6 ov er l aps t hi s Sur v ei l l ance t o pr ov i de c om pl et e t est i ng of t he ass um ed s af et y f unct i on. T he 18 m ont h Fr equenc y i s ba sed on t he need t o per f or m t hi s Sur v ei l l ance under t he c ondi t i ons t hat appl y dur i ng a pl ant R el i ef and LL S I nst r um ent at i on B 3.3.6.5 BW R/6 ST S B 3.3.6.5-15 R ev. 3.0, 03/31/04 out age and t he p ot ent i al f or an u npl ann ed t r ansi ent i f t he S ur v ei l l ance wer e per f or m ed wi t h t he r eact or at power. O per at i ng ex per i ence has shown t hese com ponent s us ual l y pas s t he Sur v ei l l ance when per f or m ed a t th e 1 8 m o n th F r e q u e n c y.R E F E R E N C E S 1.
F S A R , S e c tio n [5.2.2].2.
FS AR, Ap p e n d i x 5 A.3.
G E N E-7 7 0-0 6-1 , "B a s e s f o r C h a n g e s to S u rv e il la n c e T e s t In te rv a ls and Al l owed O ut-of-Ser v i ce Ti m es f or Sel ect ed I nst r um ent at i on T echn i cal Speci f i cat i ons," Febr uar y 1991.