ML072120091

NRC Response to 4/16/2007 Submittal of TSTF-493, Revision 2, Clarify Application of Setpoint Methodology for LSSS Functions, Enclosure 4f - BWR6_3.03.1.01_B for TSTF-493R2eITSB

ML072120091
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: ML072050146 ML072070251 ML072070260 ML072070269 ML072070355 ML072070358 ML072120059 ML072120076 ML072120083 ML072120091 ML072120096 ML072120100 ML072120105 ML072120111 ML072120119 ML072120145 ML072120153 ML072120162 ML072120164 ML072120165 ML072120168
References
TAC MD5249, TSTF-493, Rev 2
Download: ML072120091 (41)

Text

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-1 R ev. 3.0, 03/31/04 B 3.3 I NS TRU ME NTA TI ON B 3.3.1.1 React or Pr ot ect i on Sy st em (R PS) I nst r um ent at i on BAS ES BA C KG R O U N D T he RP S i ni t i at es a r eact or sc r am when one or m or e m oni t or ed par am et er s ex ceed t hei r spe ci f i ed l i m i t , t o pr eser v e t he i nt egr i t y of t he f uel cl addi ng and t he React or C ool ant Sy st em (R C S), and m i ni m i z e t he ener gy t hat m ust be abs or bed f ol l owi ng a l oss of coo l ant acc i dent (L O C A). T h is c a n b e a c c o m p lis h e d e ith e r a u to m a tic a lly o r m a n u a lly.T he pr ot ect i on and m oni t or i ng f unct i ons of t he RP S hav e been desi gned t o ens ur e sa f e oper at i on of t he r eact or. T hi s i s ac hi ev ed by spe ci f y i ng li m iti n g s a f e ty s ys te m s e ttin g s (L S S S) in te rm s o f p a ra m e te rs d ire c tly m oni t or ed by t he RP S, as we l l as L C O s on ot her r eact or sy st em par am et er s, and eq ui pm ent per f or m ance. T he s ubse t of LSS S t hat di r ect l y pr ot ect agai nst v i ol at i ng t he Rr eact or C cor e Saf et y Li m i t s an d or 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 L im its dur i ng ant i ci pat ed oper at i onal occ ur r ence s (AO O s) ar e r ef er r ed t o as 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 saf et y f unct i ons. For v ar i abl es o n whi ch a SL has b e e n p l a c e d , t h e L S S S m u s t b e c h o s e n t o i n i t i a t e a u t o m a t i c p r o t e c t i ve a c tio n to c o rre c t a b n o rm a l 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 on 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 cAnal 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 s a fe ty a c ti o n i s i n i ti a te d , a s e s ta b l i s h e d b y th e s a fe ty a n a l y s i s , t o e n s u re t hat a SLan SL i s no t 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 t he Anal y t i cAnal y t i cal Li m i t t her ef or e ens ur es t hat t he SL i s no t ex ceed ed. H owev er , i n pr act i ce, t he ac t ual set t i ngs f or a u t o m a t i c p r o t e c t i ve d e vi c e s m u s t b e c h o s e n t o b e m o r e c o n s e r va t i ve t han t he Anal y t i cAnal y t i cal Li m i t t o ac coun t f or i nst r um ent l oop u n c e r t a i n t i e s r e l a t e d t o t h e s e t t i n g a t w h i c h t h e a u t o m a t i c p r o t e c t i ve a c ti o n w o u l d a c tu a l l y o c c u r.T he t r i p se t poi nt i s a p r edet er m i ned s et t i ng f or 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 An a l y t i c L i m i t a n d t h u s e n s u r i n g t h a t t h e SL w o u l d n o t b e e x c e e d e d. As such, t he t r i p set poi nt accou nt s f or unce r t ai nt i es i n set t i ng t he d evi ce (e.g., c a l i b ra ti o n), u n c e rta i n ti e s i n h o w th e d e v i c e m i g h t a c tu a l l y p e rfo rm (e.g., re p e a ta b il ity), c h a n g e s in th e p o in t o f a c tio n o f th e d e v ic e o v e r tim e (e.g., dr i f t dur i ng s ur v ei l l ance i nt er v al s), and an y ot her f act or s whi ch m ay in f lu e n c e its a c tu a l p e rf o rm a n c e (e.g., h a rs h a c c id e n t e n v iro n m e n ts). In t hi s m anner , t he t r i p se t poi nt pl ay s an i m por t ant r ol e i n ens ur i ng t hat SLs R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-2 R ev. 3.0, 03/31/04 ar e not ex ceed ed. As suc h, t he t r i p se t poi nt m eet s t he def i ni t i on of an LSS S (R ef. 1) and c oul d be us ed t o m eet t he r equi r em ent t hat t hey be cont ai ned i n t he T echn i cal S peci f i cat i ons.

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-3 R ev. 3.0, 03/31/04 BAS ES BA C KG R O U N D (cont i nued)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)." F o r a u to m a tic p ro te c tiv e d e v ic e s , th e re q u ire d s a f e ty f unct i on i s t o ens ur e t hat a SL i s no t ex ceed ed and t her ef or e t he LSSS as def i ned by 10 C FR 50.36 i s t he sa m e as t he O P E R A B I LI T Y l i m i t f or t hese d e v ic e s. H o w e v e r, u s e o f th e trip s e tp o in t to d e f in e O P E R A B IL IT Y in Te c h n i c a l Sp e c i f i c a t i o n s a n d i t s c o r r e s p o n d i n g d e s i g n a t i o n a s t h e L SSS re q u ire d b y 1 0 C F R 5 0.3 6 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 t r i p se t poi nt due t o so m e dr i f t of th e 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 th o d o lo g y fo r c a lc u la tin g th e trip s e tp o in t a n d th u s th e a u to m a tic pr ot ect i v e ac t i on woul d st i l l hav e ens ur ed t hat t he SL woul d not be ex ceed ed wi t h t he " as f ound" set t i ng of t he pr ot ect i v e dev i ce. T her ef or e, th e d e v ic e 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 saf et y 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 h e d e vi c e t o t h e t r i p s e t p o i n t 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 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 S e tp o in t. W h e re th e [L T S P] is n o t d o c u m e n te d in a c o lu m n in T a b le 3.3.1.1-1 f o r th e p u rp o s e o f c o m p li a n c e w ith 1 0 C F R 5 0.3 6 , th e p la n t-s p e c ific te rm f o r th e 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 ot e b of T abl e 3.3.1.1-1. T he br ack et s i ndi cat e pl ant-spec i f i c t er m s m ay a p p l y , a s re vi e w e d a n d a p p ro ve d b y t h e N R C. T h e a s-fo u n d a n d a s-l e ft t ol er ance s wi l l appl y t o t he ac t ual set poi nt i m pl em ent ed i n t he S u rv e il la n c e p ro c e d u re s to c o n f irm 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 cont r ol l ed u nde r 10 C FR 50.59]" i n t he sp eci f i cat i ons.--------------------------------------------------------------------------------------------------

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-4 R ev. 3.0, 03/31/04 U s e o f th e trip s e tp o in t to d e f in e "a s f o u n d" O P E R A B IL IT Y a n d its desi gnat i on as t he LSSS under t he ex pect ed c i r cum st ance s de sc r i bed abov e woul d r esul t i n ac t i ons r equi r ed by bot h t he r ul e and Techni cal S peci f i cat i ons t hat ar e cl ear l y not wa r r ant ed. H ow ever , t her e i s al so s o m e p o i n t b e y o n d w h i c h th e d e v i c e w o u l d h a v e n o t b e e n a b l e to p e rfo rm i t s f unct i on due, f or ex am pl e, t o gr eat er t han ex pect ed dr i f t. T hi s v al ue needs t o be s peci f i ed i n t he T echn i cal Speci f i cat i ons i n or der t o def i ne O PE R AB I LI T Y of t he dev i ces and i s de si gnat ed as t he Al l owabl e Val ue w h i c h , a s s t a t e d a b o v e , i s t h e s a m e a s t h e L SSS.Th e Al l o w a b l e Va l u a b l e s p e c i f i e d i n Ta b l e 3.3.1-1 s e r v e s a s t h e L SSS 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 o u n d n o t to ex ceed t he Al l owabl e Val ue. As suc h, t he Al l owabl e Val ue di f f er s f r om t he t r i p se t poi nt by an am ount pr i m ar i l y equal t o t he ex pect ed i nst r um ent l oop unce r t ai nt i es, such a s dr i f t , dur i ng t he su r v ei l l ance i nt er v al. I n t hi s R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-5 R ev. 3.0, 03/31/04 BAS ES BA C KG R O U N D (cont i nued)m anner , t he ac t ual set t i ng of t he dev i ce wi l l st i l l m eet t he LSSS def i ni t i on and 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 d evi ce ha s not dr i f t ed b ey ond t hat expect ed d ur i ng t he su r v ei l l ance i nt er v al. I f t he ac t ual set t i ng of t he dev i ce i s f ound t o hav e ex ceed ed t he A l l o w a b l e V a l u e t h e d e v i c e w o u l d b e c o n s i d e r e d i n o p e r a b l e f r o m a T echn i cal Speci f i cat i on per spec t i v e. T hi s r equi r es c or r ect i v e ac t i on in c lu d in g th o s e a c tio n s re q u ire d b y 1 0 C F R 5 0.3 6 w h e n a u to m a tic pr ot ect i v e dev i ces do not f unct i on as r equi r ed. N ot e t hat , al t hough t he chan nel i s " O PE R AB LE" under t hese ci r cum st ance s, t he t r i p se t poi nt shou l d be l ef t adj ust ed t o a v al ue wi t hi n t he es t abl i shed t r i p se t poi nt cal i br at i on t ol er ance band, i n ac cor danc e wi t h unc er t ai nt y ass um pt i ons st at ed i n 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 conf 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 unce r t ai nt y t er m s as si gned.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 S L-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 PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-6 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 ex pect ed dr i f t. T he Al l owabl e Val ue s peci f i ed i n T abl e 3.3.1.1-1 i s t he l e a s t 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 BAS ES BA C KG R O U N D (cont i nued)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 es t abl i shed as-l ef t t ol er ance of t he [LT SP] 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 i g n e d i n th e s e tp o i n t c a l c u l a ti o n. A s s u c h , t h e A l l o w a b l e V a l u e d i ff e rs f r om t he [LT SP] by an am ount equal t o [or gr eat er t han] t he as-f ound t ol er ance v al ue. I n 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 ex ceed ed at any gi v en poi nt of t i m e as l ong as t he devi ce ha s not dr i f t ed b ey ond t hat expect ed d ur i ng t he su r v ei l l ance 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 c hannel dev i ce wou l 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 P S , as sho wn i n t he F S A R , Fi gur e [ ] (R ef. 2), i ncl ude s senso r s, r el ay s, by pass ci r cui t s, and s wi t ches t hat ar e nec ess ar y t o ca use i ni t i at i on of a r eact or sc r am. Funct i onal di v er si t y i s pr ov i ded by m oni t or i ng a wi de ra n g e o f d e p e n d e n t a n d i n d e p e n d e n t p a ra m e te rs. T h e i n p u t p a ra m e te rs t o t he s cr am l ogi c ar e f r om i nst r um ent at i on t hat m oni t or s r eact or v ess el wat er l ev el , r eact or v ess el pr ess ur e, neut r on f l ux m ai n st eam l i ne is o la tio n v a lv e p o s iti o n , tu rb in e c o n tro l v a lv e (T C V) f a s t c lo s u re , trip o il p re s s u re lo w , tu rb in e s to p v a lv e (T S V) trip o il p re s s u re lo w , d ryw e ll pr ess ur e and s cr am di sc har ge v ol um e (SD V) wat er l ev el , as we l l as re a c to r m o d e s w itc h in s h u td o w n p o s iti o n a n d m a n u a l s c ra m s ig n a ls. T her e ar e at l east f our r edu nda nt senso r i npu t si gna l s f r om each of t hese pa r amet er s (wi t h t he ex c ep t i on of t he r ea c t or m od e s wi t c h i n s hu t do wn s c ra m s ig n a l). M o s t 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 R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-7 R ev. 3.0, 03/31/04 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 a c tu a te s , w h ic h th e n o u tp u ts a n R P S trip s ig n a l to th e trip lo g ic. T abl e B 3.3.1.1-1 su m m ar i z es t he di v er si t y of sen sor s c apabl e of i ni t i at i ng sc r am s du r i ng ant i ci pat ed oper at i ng t r ansi ent s t y pi cal l y anal y z ed.T h e R P S is c o m p ris e d o f tw o in d e p e n d e n t trip s ys te m s (A a n d B), w ith t w o l o g i c c h a n n e l s i n e a c h t r i p s y s t e m (l o g i c c h a n n e l s A1 a n d A2 , B1 and B2), as s hown i n R ef er ence 2. T he out put s of t he l ogi c c hannel s i n a t r i p sy st em ar e co m bi ned i n a one-out-of-t wo l ogi c s o ei t her cha nnel can trip th e a s s o c ia te d trip s ys te m. T h e trip p in g o f b o th trip s ys te m s w il l pr oduc e a r eact or sc r am. T hi s l ogi c ar r angem ent i s r ef er r ed t o as one-o u t-o f-t w o t a k e n t w i c e l o g i c. E a c h t ri p s y s t e m c a n b e re s e t b y u s e o f a r eset swi t ch. I f a f ul l sc r am occ ur s (bot h t r i p sy st em s t r i p), a r el ay pr ev ent s r eset of t he t r i p sy st em s f or 10 s econ ds a f t er t he f ul l sc r am si gnal i s r ecei v ed. T hi s 10 sec ond del ay on r eset ens ur es t hat t he s cr am f unct i on wi l l be c om pl et ed.T wo sc r am pi l ot v al v es a r e l ocat ed i n t he hy dr aul i c c ont r ol uni t (H C U) f or e a c h c o n tro l ro d d riv e (C R D). E a c h s c ra m p il o t v a lv e is s o le n o id oper at ed, wi t h t he s ol enoi ds n or m al l y ener gi z ed. T he s cr am pi l ot v al v es cont r ol t he ai r sup pl y t o t he s cr am i nl et and ou t l et v al v es f or t he ass oci at ed CR D. W hen ei t her sc r am pi l ot v al v e so l enoi d i s en er gi z ed, ai r pr ess ur e hol ds t he s cr am v al v es c l osed and, t her ef or e, bot h sc r am p il o t v a lv e s o le n o id s m u s t b e d e-e n e rg ize d to c a u s e a c o n tro l ro d to sc r am. T he s cr am v al v es c ont r ol t he s uppl y and di sc har ge pat hs f or t he C R D wat er dur i ng a s cr am. O ne of t he s cr am pi l ot v al v e so l enoi ds f or e a c h C R D is c o n tro ll e d b y trip s ys te m A , a n d th e o th e r s o le n o id is c o n tro ll e d b y trip s ys te m B. A n y trip o f trip s ys te m A in c o n ju n c tio n w ith a n y trip in trip s ys te m B re s u lts in d e-e n e rg izin g b o th s o le n o id s , a ir b l e e d i n g o f f , s c r a m v a l v e s o p e n i n g , a n d c o n t r o l r o d s c r a m.T h e b a c k u p s c ra m v a lv e s , w h ic h e n e rg ize o n a s c ra m s ig n a l to d e p re s s u rize th e s c ra m a ir h e a d e r, a re a ls o c o n tro ll e d b y th e R P S. Addi t i onal l y , t he RP S S y st em con t r ol s t he SD V v ent and dr ai n v al v es suc h t hat when bot h t r i p sy st em s t r i p, t he SD V v ent and dr ai n v al v es c l o s e t o i s o l a t e t h e SDV.BAS ES AP PLI C AB LE T he ac t i ons of t he RP S ar e as sum ed i n t he s af et y anal y ses of SA FE T Y R ef er ence s 3, 4, and 5. T he RP S i ni t i at es a r eact or sc r am when a n d A P P L IC A B IL IT Y A N A L Y S E S , L C O , m o n ito re d p a ra m e te r v a lu e s e x c e e d th e A ll o w a b le V a l u e s s p e c i fie d b y th e s e tp o i n t m e th o d o l o g y a n d l i s te d i n T a b l e 3.3.1.1-1 to p re s e rv e th e i n te g ri ty o f th e fu e l c l a d d i n g , t h e re a c to r c o o l a n t p re s s u re bounda r y (R C PB), and t he c ont ai nm ent by m i ni m i z i ng t he ener gy t hat m u s t b e a b s o r b e d f o l l o w i n g a L OCA.R P S in s tru m e n ta tio n s a tis f ie s C rite rio n 3 o f 1 0 C F R 5 0.3 6 (c)(2)(ii). Funct i ons not spe ci f i cal l y cr edi t ed i n t he ac ci dent anal y si s ar e r et ai ned f or R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-8 R ev. 3.0, 03/31/04 t h e o v e r a l l r e d u n d a n c y a n d d i v e r s i t y o f t h e RP S a s r e q u i r e d b y t h e NR C app r oved l i censi ng b asi s.Li m i t i ng 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 Rr eact or c C o re S a fe ty L i m i ts o r th e R e a c to r C o o l a n t S y s te m (R C S) p P re s s u re bounda r 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 (A O O s) a re S a f e ty L im it-L im iti n g S a f e ty S ys te m S e ttin g s (S L-L S S S). Per m i ss i v e and i nt er l ock set poi nt s al l ow by pass of t r i ps whe n t hey ar e not r equ i r ed b y t he S af et y A nal y si s. T hese per m i ssi v es an d i nt er l ocks ensu r e t hat t he st ar t i ng co ndi t i ons a r e con si st ent wi t h t he sa f et y ana l y si s, bef or e pr event at i v e or m i t i gat i ng a ct i ons o ccur. B ecau se 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 ass um pt i ons f or t he ac ci dent anal y si s, t hey ar e gener al l y con si der ed as nom i nal v al ues wi t hout r egar d t o 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 nec ess ar y v al ue t o ens ur e pr oper oper at i on of t he s af et y sy st em s t o t ur n t he AO O). T her ef or e per m i ss i v es a n d i n t e r l o c k s a r e n o t c o n s i d e r e d t o b e SL-L SSS.T he O PE R AB I LI T Y of t he RP S i s de penden t on t he O PE R AB I LI T Y of t he in d iv id u a l i n s tru m e n ta tio n c h a n n e l F u n c tio n s s p e c ifie d in T a b le 3.3.1.1-1. Each Funct i on m ust hav e a r equi r ed num ber of O PE R AB LE channel s pe r R P S trip s ys te m , w ith th e ir s e tp o in ts w ith in th e s p e c ifie d c o n s e rv a tiv e w ith r espe ct t o t he Al l owabl e Val ue, set wi t hi n t he s et t i ng t ol er ance of t he[LT SP s], wher e appr opr i at e. T he ac t ual set poi nt i s c al i br at ed c onsi st ent wi t h ap pl i cabl e set poi nt m et hod ol ogy assum pt i ons. E ach ch ann el m ust al so r espo nd wi t hi n i t s as sum ed r espo nse t i m e.

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-9 R ev. 3.0, 03/31/04 A ll o w a b le V a lu e s a re s p e c ifie d f o r e a c h R P S F u n c tio n s p e c ifie d in T a b le 3.3.1.1-1. [Li m i t i ng T r i p Set poi nt s] ar e sp eci f i ed i n [a doc um ent con t r ol l ed u n d e r 1 0 C F R 5 0.5 9 s u c h a s th e U F S A R]. T h e [L T S P s] a re s e le c te d to ensu r e t hat t he a ct ual set poi nt s ar e con ser v at i v e w i t h r espe ct t o t he a s-f o u n d t o l e r a n c e b a n d Al l o w a b l e Va l u e b e t w e e n s u c c e s s i v e CHANNEL C ALI BR AT I O N S. Af t er eac h ca l 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 r ound t he [LT SP].O per at i on wi t h a t r i p se t poi nt le s s c o n s e rv a tiv e th a n its [L T S P], b u t 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 a c c e p ta b le. 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 set poi nt i s no n-cons er v at i v e wi t h r espe ct t o i t s r equi r ed Al l owabl e Val ue.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 3.3.1.1-1 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 rin g th e s u rv e il la n c e in te rv a l. 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 dev i ce wou l 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.[Li m i t i ng T r i p Set poi nt 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 act ual pr oces s pa r am et er (e.g., r eact or v ess el wat er l ev el), and when t he 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 R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-10 R ev. 3.0, 03/31/04 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.T he O P E R A B I LI T Y of scr am pi l ot v al v es an d asso ci at ed so l eno i ds, back up s cr am v al v es, and SD V v al v es, des cr i bed i n t he Back gr ound s e c t i o n , a r e n o t a d d r e s s e d b y t h i s L CO.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)Al l owabl e Val ues ar e sp eci f i ed f or eac h R PS Funct i on s peci f i ed i n t he T a b le. 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 ac t ual set poi nt s do n o t e x c e e d t h e Al l o w a b l e Va l u e b e t w e e n s u c c e s s i v e CHANNEL C ALI BR AT I O N S. O per at i on wi t h a t r i p se t poi nt l ess con ser v at i v e t han th e n o m in a l trip s e tp o in t, b u t w ith in its A ll o w a b le V a lu e , is a c c e p ta b le. A chan nel i s i noper abl e i f i t s ac t ual t r i p se t poi nt i s no t wi t hi n i t s r equi r ed Al l owabl e Val ue.T r i p se t poi nt s ar e t hose pr edet er m i ned v al ues of out put at whi ch a n act 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 wat er l ev el), and when t he 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 li m 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 c 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 t r i p se t poi nt s ar e t hen det er m i ned, acc ount i ng f or 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 t hi s 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.T he O P E R A B I LI T Y of scr am pi l ot v al v es an d asso ci at ed so l eno i ds, back up s cr am v al v es, and SD V v al v es, des cr i bed i n t he Back gr ound s e c t i o n , a r e n o t a d d r e s s e d b y t h i s L CO.Th e i n d i v i d u a l Fu n c t i o n s a r e r e q u i r e d t o b e OPERAB L E i n t h e MODES spec i f i ed i n t he T abl e t hat m ay r equi r e an RP S t r i p t o m i t i gat e t he cons equenc es o f a des i gn bas i s ac ci dent or t r ansi ent. T o ens ur e a r el i abl e scr am f unct i on, a com bi nat i on o f Fu nct i ons i s r equ i r ed i n ea ch M O D E t o pr ovi de p r i m ar y and di v er se i ni t i at i on si gna l s.

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-11 R ev. 3.0, 03/31/04 R PS i s r equi r ed t o be OP ER AB LE i n MO D E 5 wi t h any con t r ol r od w ith d ra w n f ro m a c o re c e ll c o n ta in in g o n e o r m o re f u e l a s s e m b li e s. C ont r ol r ods wi t hdr awn f r om a co r e ce l l con t ai ni ng no f uel ass em bl i es d o n o t a ff e c t t h e r e a c t i vi t y o f t h e c o r e a n d t h e r e fore a r e n o t r e q u i r e d t o h a ve t he c apabi l i t y t o sc r am. Pr ov i ded al l ot her con t r ol r ods r em ai n i nser t ed, t h e RP S f u n c t i o n i s n o t r e q u i r e d. I n t h i s c o n d i t i o n , t h e r e q u i r e d S DM (L C O 3.1.1) a n d re fu e l p o s i ti o n o n e-ro d-o u t i n te rl o c k (L C O 3.9.2) e n s u re t hat no ev ent r equi r i ng RP S wi l l occ ur. D ur i ng nor m al oper at i on i n R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-12 R ev. 3.0, 03/31/04 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 O D ES 3 and 4 , al l con t r ol r ods ar e f ul l y i nser t ed and t he React or Mode Swi t ch Shut down Posi t i on c ont r ol r od wi t hdr awal bl ock (LC O 3.3.2.1)doe s not al l ow any cont r ol r od t o be wi t hdr aw n. U nde r t hese cond i t i ons, t h e RPS f u n c t i o n i s n o t r e q u i r e d t o b e OPERAB L E.T h e s p e c ific A p p li c a b le S a f e ty A n a ly s e s , L C O , a n d A p p li c a b il ity di scussi ons a r e l i st ed b el ow on a Fu nct i on b y Fu nct i on b asi s.1.a. I nt er m edi at e R ange Moni t or (I R M) N eut r on Fl ux - H i gh T he I R M s m oni t or neu t r on f l ux l evel s f r om t he u ppe r r ang e of t he so ur ce r ange m oni t or s (SR M s) t o t he l ower r ange of t he av er age powe r r ange m oni t or s (AP R M s). T he I R M s ar e ca pabl e of gener at i ng t r i p si gnal s t hat can be us ed t o pr ev ent f uel dam age r esul t i ng f r om abnor m al oper at i ng t r ansi ent s i n t he i nt er m edi at e po we r r ang e. I n t hi s pow er r ang e, t he m ost s ig n ific a n t s o u rc e o f re a c tiv ity c h a n g e is d u e to c o n tro l ro d w ith d ra w a l. T h e IR M p ro v i d e s d i v e rs e p ro te c ti o n fo r th e ro d w i th d ra w a l l i m i te r (R W L), w h ic h m o n ito rs a n d c o n tro ls th e m o v e m e n t o f c o n tro l ro d s a t lo w p o w e r. T he RW L pr ev ent s t he wi t hdr awal of an out of seq uenc e co nt r ol r od dur i ng s t ar t up t hat cou l d r esul t i n an un acc ept abl e neut r on f l ux ex cur si on (Re f. 6). Th e I RM p r o v i d e s mi t i g a t i o n o f t h e n e u t r o n f l u x e x c u r s i o n. To dem onst r at e t he c apabi l i t y of t he I R M Sy st em t o m i t i gat e co nt r ol r od w ith d ra w a l e v e n ts , g e n e ric a n a ly s e s h a v e b e e n p e rf o rm e d (R e f. 7) to ev al uat e t he c onse quenc es o f con t r ol r od wi t hdr awal ev ent s du r i ng s ta rtu p th a t a re m iti g a te d o n ly b y th e IR M. T h is a n a ly s is , w h ic h a s s u m e s th a t o n e IR M c h a n n e l i n e a c h trip s ys te m is by pass ed, dem onst r at es t hat t he I R M s pr ov i de pr ot ect i on agai nst l ocal cont r ol r od wi t hdr awal er r or s an d r esul t s i n peak f uel ener gy depos i t i ons b e lo w th e 1 7 0 c a l/g m f u e l fa il u re th re s h o ld c rite rio n. T he I R M s ar e al so c apabl e of l i m i t i ng ot her r eact i v i t y ex cur si ons dur i ng s ta rtu p , s u c h a s c o ld w a te r in je c tio n e v e n ts , a lth o u g h n o c re d it i s spec i f i cal l y ass um ed.T he I R M Sy st em i s di v i ded i nt o t wo gr oups of I R M cha nnel s, wi t h f our I R M cha nnel s i nput t i ng t o eac h t r i p sy st em. T he anal y si s of R ef er ence 7 ass um es t hat one c hannel i n eac h t r i p sy st em i s by pass ed. T her ef or e, s i x c h a n n e l s w i t h t h r e e c h a n n e l s i n e a c h t r i p s y s t e m a r e r e q u i r e d f o r I RM O PE R AB I LI T Y t o ens ur e t hat no s i ngl e i nst r um ent f ai l ur e wi l l pr ecl ude a sc r am f r om t hi s Func t i on on a v al i d si gnal. T hi s t r i p i s ac t i v e i n eac h of th e 1 0 ra n g e s o f th e IR M , w h ic h m u s t b e s e le c te d b y th e o p e ra to r to m ai nt ai n t he neut r on f l ux wi t hi n t he m oni t or ed l ev el of an I R M r ange.

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-13 R ev. 3.0, 03/31/04 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)Th e a n a l y s i s o f Re f e r e n c e 7 h a s a d e q u a t e c o n s e r v a t i o n t o p e r mi t a n I RM Al l owabl e Val ue of 120 di v i si ons of a 125 d i v i si on s cal e.T he I nt er m edi at e R ange Moni t or N eut r on Fl ux - H i gh Func t i on m ust be O PE R AB LE dur i ng MO D E 2 when con t r ol r ods m ay be wi t hdr awn and t he p o te n tia l fo r c ritic a li ty e x is ts. In M O D E 5 , w h e n a c e ll w ith f u e l h a s its cont r ol r od wi t hdr awn, t he I R M s pr ov i de m oni t or i ng f or and pr ot ect i on a g a i n s t u n e x p e c t e d r e a c t i v i t y e x c u r s i o n s. I n MOD E 1 , t h e A P RM Sy st em , t he RW L, and t he Rod P at t er n C ont r ol l er (R PC) pr ov i de p ro te c ti o n a g a i n s t c o n tro l ro d w i th d ra w a l e rro r e v e n ts a n d th e IR M s a re not r equi r ed.1.b. I nt er m edi at e R ange Moni t or - I nop T h i s tri p s i g n a l p ro v i d e s a s s u ra n c e th a t a m i n i m u m n u m b e r o f IR M s a re O PE R AB LE. Any t i m e an I R M m ode s wi t ch i s m ov ed t o any pos i t i on o th e r th a n "O p e ra te ," t h e d e te c to r vo l ta g e d ro p s b e l o w a p re s e t l e v e l , o r a m odul e i s no t pl ugged i n, an i noper at i v e t r i p si gnal wi l l be r ecei v ed by t he R PS unl ess t he I R M i s by pass ed. Si nce onl y one I R M i n eac h t r i p sy st em m ay be by pass ed, onl y one I R M i n eac h R PS t r i p sy st em m ay be in o p e ra b le w ith o u t re s u lti n g in a n R P S trip s ig n a l.T h is F u n c tio n w a s n o t s p e c ific a ll y c re d ite d in th e a c c id e n t a n a ly s is , b u t it i s r et ai ned f or t he ov er al l r edunda ncy and di v er si t y of t he RP S as r equ i r ed b y t he N R C app r oved l i censi ng b asi s.S ix c h a n n e ls o f In te rm e d ia te R a n g e M o n ito r - In o p w ith th re e c h a n n e ls in e a c h trip s ys te m a re re q u ire d to b e O P E R A B L E to e n s u re th a t n o s in g le in s tru m e n t fa il u re w il l p re c lu d e a s c ra m f ro m th is F u n c tio n o n a v a li d s ig n a l.Si nce t hi s Func t i on i s no t ass um ed i n t he s af et y anal y si s, t her e i s no Al l owabl e Val ue f or t hi s Func t i on.T hi s Func t i on i s r equi r ed t o be OP ER AB LE when t he I nt er m edi at e R ange M oni t or N eut r on Fl ux - H i gh Func t i on i s r equi r ed.2.a. Av er ag e Po we r Rang e Mo ni t or Neut r on Fl ux - Hi gh , Set do wn T he AP R M cha nnel s r ecei v e i nput si gnal s f r om t he l ocal power r ange m oni t or s (LPR M) wi t hi n t he r eact or cor e t o pr ov i de an i ndi cat i on of t he p o w e r d is trib u tio n a n d lo c a l p o w e r c h a n g e s. T h e A P R M c h a n n e ls a ve ra g e t h e s e L P R M s i g n a l s t o p ro vi d e a c o n t i n u o u s i n d i c a t i o n o f R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-14 R ev. 3.0, 03/31/04 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)av er age r eact or power f r om a f ew per cent t o gr eat er t han RT P. For oper at i on at l ow power (i.e., MO D E 2), t he Av er age Power R ange Moni t or N e u tro n F lu x - H ig h , S e td o w n F u n c tio n is c a p a b le o f g e n e ra tin g a trip si gnal t hat pr ev ent s f uel dam age r esul t i ng f r om abnor m al oper at i ng t r ansi ent s i n t hi s pow er r ang e. Fo r m ost ope r at i on a t l ow pow er l evel s, t he Av er ag e Po we r Rang e Mo ni t or Neut r on Fl ux - Hi gh , Set do wn Funct i on wi l l pr ov i de a s econ dar y sc r am t o t he I nt er m edi at e R ange M o n ito r N e u tro n F lu x - H ig h F u n c tio n b e c a u s e o f th e re la tiv e s e tp o in ts. W i t h t he I R M s at R ange 9 or 10, i t i s po ss i bl e t hat t he Av er age Power R ange Moni t or N eut r on Fl ux - H i gh, Set down Func t i on wi l l pr ov i de t he p ri m a ry tri p s i g n a l fo r a c o re w i d e i n c re a s e i n p o w e r.N o sp eci f i c s af et y anal y ses t ake di r ect cr edi t f or t he Av er age Power R a n g e M o n ito r N e u tro n F lu x - H ig h , S e td o w n F u n c tio n. H o w e v e r, th is Funct i on i ndi r ect l y ens ur es t hat , bef or e t he r eact or m ode s wi t ch i s pl aced i n t he r un pos i t i on, r eact or power does not ex ceed 25% R T P (SL 2.1.1.1)w h e n o p e ra tin g a t lo w re a c to r p re s s u re a n d lo w c o re f lo w. T h e re f o re , it in d ire c tly p re v e n ts f u e l d a m a g e d u rin g s ig n ific a n t re a c tiv ity in c re a s e s w ith T H E R M A L P O W E R < 2 5% R T P. T he AP R M Sy st em i s di v i ded i nt o t wo gr oups of cha nnel s wi t h t hr ee A P R M c h a n n e l i n p u ts to e a c h trip s ys te m. T h e s ys te m is d e s ig n e d to a l l o w o n e c h a n n e l i n e a c h t r i p s y s t e m t o b e b y p a s s e d. A n y o n e A P RM c h a n n e l i n a trip s ys te m c a n c a u s e th e a s s o c ia te d trip s ys te m to trip. S ix chan nel s of Av er age Power R ange Moni t or N eut r on Fl ux - H i gh, Set down, wi t h t hr ee c hannel s i n eac h t r i p sy st em ar e r equi r ed t o be O PE R AB LE t o ens ur e t hat no s i ngl e f ai l ur e wi l l pr ecl ude a s cr am f r om t hi s Func t i on on a v al i d si gnal. I n addi t i on, t o pr ov i de adeq uat e co v er age o f t h e e n t i r e c o r e , a t l e a s t 1 1 L P RM i n p u t s a r e r e q u i r e d f o r e a c h A P RM c h a n n e l, w ith a t le a s t tw o L P R M in p u ts f ro m e a c h o f th e f o u r a x ia l l e v e ls at whi ch t he LPR M s ar e l ocat ed.T h e A ll o w a b le V a lu e is b a s e d o n p re v e n tin g s ig n ific a n t in c re a s e s in p o w e r w h e n THERMAL POW ER i s < 2 5% RTP.The Av er ag e Po we r Rang e Mo ni t or Neut r on Fl ux - Hi gh , Set do wn Funct i on m ust be O PE R AB LE dur i ng MO D E 2 when con t r ol r ods m ay be w i th d ra w n , a n d i n M O D E 5 w i th a n y c o n tro l ro d w i th d ra w n fro m a c o re cel l con t ai ni ng one or m or e f uel ass em bl i es, si nce t he pot ent i al f or cr i t i cal i t y ex i st s. I n MO D E 1, t he Av er age Power R ange Moni t or N eut r on Fl ux - H i gh Func t i on pr ov i des pr ot ect i on agai nst r eact i v i t y t r ansi ent s an d t he R W L an d R P C pr ot ect aga i nst cont r ol r od w i t hdr aw al er r or event s.

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-15 R ev. 3.0, 03/31/04 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)2.b. Av er age Power R ange Moni t or Fl ow Bi ased Si m ul at ed T her m al Power - H i gh T he Av er age Power R ange Moni t or Fl ow Bi ased Si m ul at ed T her m al Power - H i gh Func t i on m oni t or s ne ut r on f l ux t o appr ox i m at e t he THE RM A L P OW E R b e i n g t r a n s f e r r e d t o t h e r e a c t o r c o o l a n t. Th e A P RM neut r on f l ux i s el ect r oni cal l y f i l t er ed wi t h a t i m e co nst ant r epr esen t at i v e of t he f uel heat t r ansf er dy nam i cs t o gener at e a s i gnal pr opor t i onal t o t he T H ER M AL P O W ER i n t he r eact or. T he t r i p l ev el i s v ar i ed as a f unct i on of r eci r cul at i on dr i v e f l ow (i.e., at l ower cor e f l ows t he s et poi nt i s r educ ed p ro p o rtio n a l to th e re d u c tio n in p o w e r e x p e rie n c e d a s c o re f lo w is re d u c e d w ith a f ix e d c o n tro l ro d p a tte rn) b u t is c la m p e d a t a n u p p e r lim it t hat i s al way s l ower t han t he Av er age Power R ange Moni t or Fi x ed N eut r on Fl ux - H i gh Func t i on Al l owabl e Val ue. T he Av er age Power R ange Moni t or Fl ow Bi ased Si m ul at ed T her m al Power - H i gh Func t i on p r o v i d e s p r o t e c t i o n a g a i n s t t r a n s i e n t s w h e r e THERMAL POW ER i ncr ease s s l owl y (suc h as t he l oss of f eedwat er heat i ng ev ent) and pr ot ect s t he f uel cl addi ng i nt egr i t y by ens ur i ng t hat t he MC PR SL i s no t ex ceed ed. D ur i ng t hese ev ent s, t he T H ER M AL P O W ER i ncr ease does n o t s ig n ific a n tly la g th e n e u tro n f lu x re s p o n s e a n d , b e c a u s e o f a lo w e r trip set poi nt , wi l l i ni t i at e a s cr am bef or e t he hi gh neut r on f l ux sc r am. For r api d neut r on f l ux i ncr ease ev ent s, t he T H ER M AL P O W ER l ags t he n e u t r o n fl u x a n d t h e A ve r a g e P o w e r R a n g e M o n i t o r F i xe d N e u t r o n F l u x -H i gh Func t i on wi l l pr ov i de a s cr am si gnal bef or e t he Av er age Power R ange Moni t or Fl ow Bi ased Si m ul at ed T her m al Power - H i gh Func t i on s e tp o in t is e x c e e d e d. Th e A P RM S y s t e m i s d i v i d e d i n t o t w o g r o u p s o f c h a n n e l s w i t h f o u r A P RM i nput s t o eac h t r i p sy st em. T he s y st em i s de si gned t o al l ow one c hannel i n eac h t r i p sy st em t o be by pass ed. Any one Av er age Power R ange M o n ito r c h a n n e l i n a trip s ys te m c a n c a u s e th e a s s o c ia te d trip s ys te m to t r i p. Si x cha nnel s of Av er age Power R ange Moni t or Fl ow Bi ased Si m ul at ed T her m al Power - H i gh, wi t h t hr ee c hannel s i n eac h t r i p sy st em a rra n g e d in o n e-o u t-o f-th re e lo g ic , a re re q u ire d to b e O P E R A B L E to e n s u re th a t n o s in g le in s tru m e n t fa il u re w il l p re c lu d e a s c ra m f ro m th is Funct i on on a v al i d si gnal. I n addi t i on, t o pr ov i de adeq uat e co v er age of t h e e n t i r e c o r e , a t l e a s t 1 1 L P RM i n p u t s a r e r e q u i r e d f o r e a c h A P RM c h a n n e l, w ith a t le a s t tw o L P R M in p u ts f ro m e a c h o f th e f o u r a x ia l l e v e ls at whi ch t he LPR M s ar e l ocat ed. Each AP R M cha nnel r ecei v es o ne t ot al dr i v e f l ow si gnal r epr esen t at i v e of t ot al cor e f l ow. T he r eci r cul at i on l oop dr i v e f l ow si gnal s ar e gener at ed by ei ght f l ow uni t s. O ne f l ow uni t f r om e a c h r e c i r c u l a t i o n l o o p i s p r o vi d e d t o e a c h A P R M c h a n n e l. T o t a l d r i ve f lo w is d e te rm in e d b y e a c h A P R M b y s u m m in g u p th e f lo w s ig n a ls pr ovi ded t o t he A P R M f r om t he t wo r eci r cul at i on l oop s.

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-16 R ev. 3.0, 03/31/04 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)T he c l am ped Al l owabl e Val ue i s ba sed on anal y ses t hat t ake cr edi t f or t he Av er age Power R ange Moni t or Fl ow Bi ased Si m ul at ed T her m al Power - H i gh Func t i on f or t he m i t i gat i on of t he l oss of f eedwat er heat er ev ent. T he T H ER M AL P O W ER t i m e co nst ant of < 7 sec onds i s ba sed on t he f uel heat t r ansf er dy nam i cs and pr ov i des a si gnal t hat i s pr opor t i onal t o t h e THE RM A L P OW E R.T he Av er age Power R ange Moni t or Fl ow Bi ased Si m ul at ed T her m al Power - H i gh Func t i on i s r equi r ed t o be OP ER AB LE i n MO D E 1 when t her e i s t he pos si bi l i t y of gener at i ng ex ces si v e T H ER M AL P O W ER and pot ent i al l y ex ceed i ng t he SL appl i cabl e t o hi gh pr ess ur e and c or e f l ow c o n d i t i o n s (MC P R S L). Du r i n g MOD E S 2 a n d 5 , o t h e r I RM a n d A P RM F u n c tio n s p r o v id e p r o te c tio n f o r f u e l c la d d in g in te g r ity.2.c. Av er age Power R ange Moni t or Fi x ed Neut r on Fl ux - H i gh T h e A P R M c h a n n e ls p ro v id e th e p rim a ry in d ic a tio n o f n e u tro n f lu x w ith in th e c o re a n d re s p o n d a lm o s t in s ta n ta n e o u s ly to n e u tro n f lu x in c re a s e s. T h e A v e ra g e P o w e r R a n g e M o n ito r F ix e d N e u tro n F lu x - H ig h F u n c tio n is c a p a b l e o f ge n e r a t i n g a t r i p s i g n a l t o p r e ve n t fue l d a m a g e o r e xc e s s i ve R C S pr ess ur e. For t he ov er pr ess ur i z at i on pr ot ect i on anal y si s of R e fere n c e 3 , t h e A ve r a g e P o w e r R a n g e M o n i t o r F i xe d N e u t r o n F l u x -H i g h F u n c t i o n i s a s s u m e d t o t e r m i n a t e t h e m a i n s t e a m i s o l a t i o n va l ve (M S IV) c l o s u re e v e n t a n d , a l o n g w i th th e s a fe ty/re l i e f v a l v e s (S/R V s), l i m i t s t he peak r eact or pr ess ur e v ess el (R PV) pr ess ur e t o l ess t han t he A S M E C o d e li m its. T h e c o n tro l ro d d ro p a c c id e n t (C R D A) a n a ly s is (R ef. 8) t akes cr edi t f or t he Av er age Power R ange Moni t or Fi x ed Neut r on F lu x - H ig h F u n c tio n to te rm in a te th e C R D A. Th e A P RM S y s t e m i s d i v i d e d i n t o t w o g r o u p s o f c h a n n e l s w i t h f o u r A P RM chan nel s i nput t i ng t o eac h t r i p sy st em. T he s y st em i s de si gned t o al l ow one c hannel i n eac h t r i p sy st em t o be by pass ed. Any one APR M cha nnel in a trip s ys te m c a n c a u s e th e a s s o c ia te d trip s ys te m to trip. S ix c h a n n e ls of Av er age Power R ange Moni t or Fi x ed Neut r on Fl ux - H i gh wi t h t hr ee c h a n n e l s i n e a c h tri p s y s te m a rra n g e d i n a o n e-o u t-o f-th re e l o g i c a re re q u ire d to b e O P E R A B L E to e n s u re th a t n o s in g le in s tru m e n t fa il u re w il l p re c lu d e a s c ra m f ro m th is F u n c tio n o n a v a li d s ig n a l. In a d d iti o n , to pr ovi de a deq uat e cover age of t he e nt i r e cor e, at l east 11 L P R M i npu t s ar e r equi r ed f or eac h AP R M cha nnel , wi t h at l east t wo LPR M i nput s f r om each of t he f our ax i al l ev el s at whi ch t he LPR M s ar e l ocat ed.T he Al l owabl e Val ue i s ba sed on t he Anal y t i cal Li m i t ass um ed i n t he C R D A ana l y ses.

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-17 R ev. 3.0, 03/31/04 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)T h e A v e ra g e P o w e r R a n g e M o n ito r F ix e d N e u tro n F lu x - H ig h F u n c tio n is r equi r ed t o be OP ER AB LE i n MO D E 1 wher e t he pot ent i al con sequ ence s o f t h e a n a l y z e d t r a n s i e n t s c o u l d r e s u l t i n t h e S L s (e.g., MC P R a n d RC S pr ess ur e) bei ng ex ceed ed. Al t hough t he Av er age Power R ange Moni t or Fi x ed Neut r on Fl ux - H i gh Func t i on i s as sum ed i n t he CR D A anal y si s t hat i s ap pl i cabl e i n MO D E 2, t he Av er age Power R ange Moni t or N eut r on Fl ux- H i gh, Set down Func t i on c onse r v at i v el y bounds t he as sum ed t r i p and, to g e th e r w ith th e a s s u m e d IR M trip s , p ro v id e s a d e q u a te p ro te c tio n. T her ef or e, t he Av er age Power R ange Moni t or Fi x ed Neut r on Fl ux - H i gh Funct i on i s no t r equi r ed i n MO D E 2.2.d. Av er age Power R ange Moni t or - I nop T h i s s i g n a l p ro v i d e s a s s u ra n c e th a t a m i n i m u m n u m b e r o f A P R M s a re O PE R AB LE. Any t i m e an APR M m ode s wi t ch i s m ov ed t o any pos i t i on o th e r th a n O p e ra te , a n A P R M m o d u le is u n p lu g g e d , th e e le c tro n ic oper at i ng v ol t age i s l ow, or t he AP R M has t oo f ew LPR M i nput s (< 11), an in o p e ra tiv e trip s ig n a l w il l b e re c e iv e d b y th e R P S , u n le s s th e A P R M is by pass ed. Si nce onl y one APR M i n eac h t r i p sy st em m ay be by pass ed, o n ly o n e A P R M in e a c h trip s ys te m m a y b e in o p e ra b le w ith o u t re s u lti n g in an RP S t r i p si gnal. T hi s Func t i on was not spe ci f i cal l y cr edi t ed i n t he acc i dent anal y si s, but i t i s r et ai ned f or t he ov er al l r edunda ncy and d iv e rs ity o f th e R P S a s re q u ire d b y th e N R C a p p ro v e d li c e n s in g b a s is. F o u r c h a n n e ls o f A v e ra g e P o w e r R a n g e M o n ito r - In o p w ith tw o c h a n n e ls i n eac h t r i p sy st em ar e r equi r ed t o be OP ER AB LE t o ens ur e t hat no s in g le f a il u re w il l p re c lu d e a s c ra m f ro m th is F u n c tio n o n a v a li d s ig n a l.T her e i s no Al l owabl e Val ue f or t hi s Func t i on.T hi s Func t i on i s r equi r ed t o be OP ER AB LE i n t he MO D ES wher e t he AP R M Funct i ons ar e r equi r ed.3. R eact or Vessel St eam D om e Pr ess ur e - H i gh An i ncr ease i n t he RP V pr ess ur e dur i ng r eact or oper at i on c om pr ess es t he s t eam v oi ds a nd r esul t s i n a pos i t i v e r eact i v i t y i nser t i on. T hi s c ause s t he neut r on f l ux and TH ER M AL P O W ER t r ansf er r ed t o t he r eact or cool ant t o i ncr ease , whi ch c oul d ch al l enge t he i nt egr i t y of t he f uel cl addi ng and t he RC PB. N o sp eci f i c s af et y anal y si s t akes di r ect cr edi t f or t hi s Func t i on. H owev er , t he React or Vessel St eam D om e Pr ess ur e -H i g h F u n c ti o n i n i ti a te s a s c ra m fo r tr a n s i e n ts th a t re s u l ts i n a p re s s u re i ncr ease , cou nt er act i ng t he pr ess ur e i ncr ease by r api dl y r educ i ng c or e R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-18 R ev. 3.0, 03/31/04 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)power. For t he ov er pr ess ur i z at i on pr ot ect i on anal y si s of R ef er ence 3, t he r eact or sc r am (t he anal y ses con ser v at i v el y ass um e sc r am on t he Av er age Power R ange Moni t or Fi x ed Neut r on Fl ux - H i gh s i gnal , not t he R eact or Vessel St eam D om e Pr ess ur e-H i gh s i gnal), al ong wi t h t he S/R V s , li m its th e p e a k R P V p re s s u re to le s s th a n th e A S M E S e c tio n III C o d e li m its. H i g h re a c to r p re s s u re s i g n a l s a re i n i ti a te d fro m fo u r p re s s u re tra n s m i tt e rs th a t s e n s e re a c to r p re s s u re. T h e R e a c to r V e s s e l S te a m D o m e P re s s u re- H i gh Al l owabl e Val ue i s c hose n t o pr ov i de a s uf f i ci ent m ar gi n t o t he A S M E S e c tio n III C o d e li m its d u rin g th e e v e n t. Four cha nnel s of R eact or Vessel St eam D om e Pr ess ur e - H i gh Func t i on, wi t h t wo chan nel s i n ea ch t r i p sy st em ar r ang ed i n a o ne-out-of-t wo l ogi c, a re re q u i re d to b e O P E R A B L E to e n s u re th a t n o s i n g l e i n s tru m e n t fa i l u re w il l p re c lu d e a s c ra m f ro m th is F u n c tio n o n a v a li d s ig n a l. T h e F u n c tio n is re q u ire d to b e O P E R A B L E in M O D E S 1 a n d 2 w h e n th e R C S is pr essur i z ed a nd t he p ot ent i al f or pr essur e i ncr ease exi st s.4. R e a c to r V e s s e l W a te r L e v e l - L o w , L e v e l 3 Low RP V wat er l ev el i ndi cat es t he c apabi l i t y t o co ol t he f uel m ay be th re a te n e d. S h o u ld R P V w a te r le v e l d e c re a s e to o f a r, f u e l d a m a g e c o u ld re s u lt. T h e re f o re , a re a c to r s c ra m is in iti a te d a t L e v e l 3 to s u b s ta n tia ll y r educ e t he heat gener at ed i n t he f uel f r om f i ss i on. T he React or Vessel W at er Lev el - Low, Lev el 3 Funct i on i s as sum ed i n t he anal y si s of t he r eci r cul at i on l i ne br eak (R ef. 4). T he r eact or sc r am r educ es t he am ount of ener gy r equi r ed t o be ab sor bed and , al ong wi t h t he ac t i ons of t he Em er genc y C or e C ool i ng Sy st em s (EC C S), ens ur es t hat t he f uel peak cl addi ng t em per at ur e r em ai ns b el ow t he l i m i t s of 10 CF R 50.46.R eact or Vessel W at er Lev el - Low, Lev el 3 si gnal s ar e i ni t i at ed f r om f our l ev el t r ansm i t t er s t hat sen se t he di f f er ence bet ween t he pr ess ur e due t o a cons t ant col um n of wat er (r ef er ence l eg) and t he pr ess ur e due t o t he a c tu a l w a te r le v e l (v a ria b le le g) in th e v e s s e l.Four cha nnel s of R eact or Vessel W at er Lev el - Low, Lev el 3 Funct i on, wi t h t wo chan nel s i n ea ch t r i p sy st em ar r ang ed i n a o ne-out-of-t wo l ogi c, a re re q u i re d to b e O P E R A B L E to e n s u re th a t n o s i n g l e i n s tru m e n t fa i l u re w il l p re c lu d e a s c ra m f ro m th is F u n c tio n o n a v a li d s ig n a l.T h e R e a c to r V e s s e l W a te r L e v e l - L o w , L e v e l 3 A ll o w a b le V a lu e is sel ect ed t o ens ur e t hat , f or t r ansi ent s i nv ol v i ng l oss of al l nor m al f e e d w a te r f lo w , in iti a tio n o f th e lo w p re s s u re E C C S a t R P V W a te r L e v e l 1 wi l l not be r equi r ed.

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-19 R ev. 3.0, 03/31/04 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)T he Func t i on i s r equi r ed i n MO D ES 1 and 2 wher e co nsi der abl e ener gy e x i s t s i n t h e RC S r e s u l t i n g i n t h e l i mi t i n g t r a n s i e n t s a n d a c c i d e n t s. E CC S i ni t i at i ons at R eact or Vessel W at er Lev el - Low Low, Lev el 2 and L ow L o w L o w , L e v e l 1 p ro v id e s u f f ic ie n t p ro te c tio n f o r le v e l tra n s ie n ts in a ll o t h e r MODES.5. R e a c to r V e s s e l W a te r L e v e l - H ig h , L e v e l 8 H i gh RP V wat er l ev el i ndi cat es a pot ent i al pr obl em wi t h t he f eedwat er le v e l c o n tro l s ys te m , re s u lti n g in th e a d d iti o n o f re a c tiv ity a s s o c ia te d w ith th e in tro d u c tio n o f a s ig n ific a n t a m o u n t o f re la tiv e ly c o ld f e e d w a te r. T h e re f o re , a s c ra m is in iti a te d a t L e v e l 8 to e n s u re th a t M C P R is m a in ta in e d a b o v e th e M C P R S L. T h e R e a c to r V e s s e l W a te r L e v e l -H i gh, Lev el 8 Funct i on i s on e of t he m any Funct i ons ass um ed t o be O P E R A B L E a n d c a p a b le o f p ro v id in g a re a c to r s c ra m d u rin g tra n s ie n ts anal y z ed i n R ef er ence 4. I t i s di r ect l y ass um ed i n t he anal y si s of f e e d w a te r c o n tro ll e r f a il u re , m a x im u m d e m a n d (R e f. 5). R eact or Vessel W at er Lev el - H i gh, Lev el 8 si gnal s ar e i ni t i at ed f r om f our l ev el t r ansm i t t er s t hat sen se t he di f f er ence bet ween t he pr ess ur e due t o a cons t ant col um n of wat er (r ef er ence l eg) and t he pr ess ur e due t o t he act ual wat er l ev el (v ar i abl e l eg) i n t he v ess el. T he React or Vessel W at er Lev el - H i gh, Lev el 8 Al l owabl e Val ue i s s peci f i ed t o ens ur e t hat t he M C P R S L is n o t v io la te d d u rin g th e a s s u m e d tra n s ie n t.F o u r c h a n n e ls o f th e R e a c to r V e s s e l W a te r L e v e l - H ig h , L e v e l 8 F u n c t i o n , w i t h t w o c h a n n e l s i n e a c h t ri p s y s t e m a rr a n g e d i n a o n e-o u t-o f-t wo l ogi c, ar e av ai l abl e and a r e r equi r ed t o be OP ER AB LE when T H E R M A L P O W E R i s $ 25% R T P t o ens ur e t hat no s i ngl e i nst r um ent f a il u re w il l p re c lu d e a s c ra m f ro m th is F u n c tio n o n a v a li d s ig n a l. W ith T H E R M A L P O W E R < 25% R T P , t hi s Fu nct i on i s not r equ i r ed si nce MCPR i s n o t a c o n c e r n b e l o w 2 5% RTP.6. M a i n S te a m Is o l a ti o n V a l v e - C l o s u re M S I V cl osur e r esul t s i n l oss of t he m ai n t ur bi ne a nd t he co nde nser as a h e a t s in k f o r th e N u c le a r S te a m S u p p ly S ys te m a n d in d ic a te s a n e e d to shut down t he r eact or t o r educ e heat gener at i on. T her ef or e, a r eact or s c ra m i s i n i ti a te d o n a M a i n S te a m Is o l a ti o n V a l v e - C l o s u re s i g n a l b e fo re t he MS I Vs ar e co m pl et el y cl osed i n ant i ci pat i on of t he c om pl et e l oss of th e n o rm a l h e a t s in k a n d s u b s e q u e n t o v e rp re s s u riza tio n tra n s ie n t. H owev er , f or t he ov er pr ess ur i z at i on pr ot ect i on anal y si s of R ef er ence 3, t he Av er age Power R ange Moni t or Fi x ed Neut r on Fl ux - H i gh Func t i on, al ong wi t h t he S/R Vs, l i m i t s t he peak R PV pr ess ur e t o l ess t han t he R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-20 R ev. 3.0, 03/31/04 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)AS M E C ode l i m i t s. T hat i s, t he di r ect sc r am on pos i t i on s wi t ches f or M S IV c lo s u re e v e n ts is n o t a s s u m e d in th e o v e rp re s s u riza tio n a n a ly s is. A d d iti o n a ll y, M S IV c lo s u re is a s s u m e d in th e tra n s ie n ts a n a ly ze d in R ef er ence 5 (e.g., l ow st eam l i ne p r essur e, m anu al cl osur e of M S I V s, hi gh s t eam l i ne f l ow). T he r eact or sc r am r educ es t he am ount of ener gy r equi r ed t o be ab sor bed and , al ong wi t h t he ac t i ons of t he EC C S, ens ur es t hat t he f uel peak cl addi ng t em per at ur e r em ai ns b el ow t he l i m i t s of 1 0 C F R 5 0.4 6. M S I V cl osur e si gna l s ar e i ni t i at ed f r om posi t i on sw i t ches l ocat ed o n ea ch o f th e e ig h t M S IV s. E a c h M S IV h a s tw o p o s iti o n s w itc h e s; o n e in p u ts to R P S t r i p sy st em A wh i l e t he o t her i npu t s t o R P S t r i p sy st em B. T hus, each R PS t r i p sy st em r ecei v es a n i nput f r om ei ght Mai n St eam I sol at i on Val v e - C l osur e ch annel s, eac h co nsi st i ng of one po si t i on s wi t ch. T he l ogi c f or t he Mai n St eam I sol at i on Val v e - C l osur e Funct i on i s ar r anged suc h t hat ei t her t he i nboar d or out boar d v al v e on t hr ee or m or e of t he m a i n s te a m l i n e s (M S L s) m u s t c l o s e i n o rd e r fo r a s c ra m to o c c u r.T h e M a in S te a m Is o la tio n V a lv e - C lo s u re A ll o w a b le V a lu e is s p e c ifie d to en s ur e t ha t a s c r am oc c ur s pr i or t o a s i gn i f i c an t r ed uc t i on i n s t ea m f l ow , th e re b y re d u c in g th e s e v e rity o f th e s u b s e q u e n t p re s s u re tra n s ie n t.Si x t een c hannel s of t he Mai n St eam I sol at i on Val v e - C l osur e Funct i on w ith e ig h t c h a n n e ls in e a c h trip s ys te m a re re q u ire d to b e O P E R A B L E to e n s u re th a t n o s in g le in s tru m e n t fa il u re w il l p re c lu d e th e s c ra m f ro m th is Fu n c t i o n o n a v a l i d s i g n a l. Th i s Fu n c t i o n i s o n l y r e q u i r e d i n MODE 1 s in c e , w ith th e M S IV s o p e n a n d th e h e a t g e n e ra tio n ra te h ig h , a pr ess ur i z at i on t r ansi ent can occ ur i f t he MS I Vs cl ose. I n MO D E 2, t he h e a t g e n e r a t i o n r a t e i s l o w e n o u g h s o t h a t t h e o t h e r d i v e r s e RPS f unct i ons pr ov i de s uf f i ci ent pr ot ect i on.7. D r y wel l Pr ess ur e - H i gh H ig h p re s s u re in th e d ryw e ll c o u ld in d ic a te a b re a k in th e R C P B. A re a c to r s c ra m is in iti a te d to m in im ize th e p o s s ib il ity o f f u e l d a m a g e a n d to re d u c e th e a m o u n t o f e n e rg y b e in g a d d e d to th e c o o la n t a n d th e d ryw e ll. T h e D ryw e ll P re s s u re - H ig h F u n c tio n is a s e c o n d a ry s c ra m s ig n a l to R eact or Vessel W at er Lev el - Low, Lev el 3 f or LO C A ev ent s i nsi de t he dr y wel l. T hi s Func t i on was not spe ci f i cal l y cr edi t ed i n t he ac ci dent anal y si s, but i t T he v al ue i s r et ai ned f or t he ov er al l r edunda ncy and di v er si t y of t he R P S as r equ i r ed b y t he N R C app r oved l i censi ng b asi s.

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-21 R ev. 3.0, 03/31/04 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)H i g h d ry w e l l p re s s u re s i g n a l s a re i n i ti a te d fro m fo u r p re s s u re tra n s m i tt e rs t hat sen se d r y wel l pr ess ur e. T he Al l owabl e Val ue was sel ect ed t o be as lo w a s p o s s ib le a n d b e in d ic a tiv e o f a L O C A in s id e p rim a ry c o n ta in m e n t.F o u r c h a n n e ls o f D ryw e ll P re s s u re - H ig h F u n c tio n , w ith tw o c h a n n e ls in e a c h trip s ys te m , a re re q u ire d to b e O P E R A B L E to e n s u re th a t n o s in g le in s tru m e n t fa il u re w il l p re c lu d e a s c ra m f ro m th is F u n c tio n o n a v a li d s ig n a l. T h e F u n c tio n is re q u ire d in M O D E S 1 a n d 2 w h e re c o n s id e ra b le ener gy ex i st s i n t he RC S, r esul t i ng i n t he l i m i t i ng t r ansi ent s an d acci den t s.8.a, 8.b. Scr am D i sc har ge Vol um e W at er Lev el - Hi gh T he SD V r ecei v es t he wat er di spl aced by t he m ot i on of t he CR D pi st ons d u rin g a re a c to r s c ra m. S h o u ld th is v o lu m e f il l to a p o in t w h e re th e re is i nsuf f i ci ent v ol um e t o ac cept t he di spl aced wat er , con t r ol r od i nser t i on woul d be hi nder ed. T her ef or e, a r eact or sc r am i s i ni t i at ed when t he r e ma i n i n g f r e e v o l u me i s s t i l l s u f f i c i e n t t o a c c o mmo d a t e t h e w a t e r f r o m a f ul l cor e sc r am. H owev er , ev en t hough t he t wo t y pes of Scr am D i sc har ge Vol um e W at er Lev el - H i gh Func t i ons ar e an i nput t o t he RP S l ogi c, no cr edi t i s t aken f or a sc r am i ni t i at ed f r om t hese Funct i ons f or any of t he d e s i g n b a s i s a c c i d e n ts o r tr a n s i e n ts a n a l y ze d i n th e F S A R. H o w e v e r, t h e y a r e r e t a i n e d t o e n s u r e t h a t t h e RPS r e m a i n s OPERAB L E.S D V wa t er l evel i s m easu r ed b y t wo di v er se m et hod s. T he l evel i n ea ch of t he t wo SDVs i s m ea s ur ed by t wo f l oa t t y pe l ev el s wi t c he s an d t wo t r ansm i t t er s an d t r i p uni t s f or a t ot al of ei ght l ev el si gnal s. T he out put s of t hese devi ces ar e ar r ang ed so t hat t her e i s a si gna l f r om a l evel swi t ch and a t r ansm i t t er and t r i p uni t t o eac h R PS l ogi c c hannel. T he l ev el m easu r em ent i nst r um ent at i on s at i sf i es t he r ecom m endat i ons of R ef er ence 9.T h e A ll o w a b le V a lu e is c h o s e n lo w e n o u g h to e n s u re th a t th e re is s u f f i c i e n t v o l u me i n t h e S D V t o a c c o mmo d a t e t h e w a t e r f r o m a f u l l s c r a m.F o u r c h a n n e ls o f e a c h typ e o f S c ra m D is c h a rg e V o lu m e W a te r L e v e l -H i gh Func t i on, wi t h t wo cha nnel s of eac h t r i p sy st em , ar e r equi r ed t o be O PE R AB LE t o ens ur e t hat no s i ngl e i nst r um ent f ai l ur e wi l l pr ecl ude a s c ra m fro m th e s e F u n c ti o n s o n a v a l i d s i g n a l. T h e s e F u n c ti o n s a re r equi r ed i n MO D ES 1 and 2 , and i n MO D E 5 wi t h any con t r ol r od wi t hdr aw n f r om a cor e cel l cont ai ni ng o ne o r m or e f uel assem bl i es, si nce t hese ar e t he MO D ES and ot her spe ci f i ed c ondi t i ons when c ont r ol r ods ar e wi t hdr awn. At al l ot her t i m es, t hi s Func t i on m ay be by pass ed.

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-22 R ev. 3.0, 03/31/04 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)9. T ur bi ne St op Val v e C l osur e, T r i p O i l Pr ess ur e - Low C l osur e of t he T SV s r esul t s i n t he l oss of a heat si nk t hat pr oduc es r eact or pr ess ur e, neut r on f l ux , and he at f l ux t r ansi ent s t hat m ust be l i m i te d. T h e re fo re , a re a c to r s c ra m i s i n i ti a te d a t t h e s ta rt o f T S V c l o s u re i n an t i ci pat i on o f t he t r ansi ent s t hat wo ul d r esul t f r om t he cl osur e of t hese v al v es. T he T ur bi ne St op Val v e C l osur e, T r i p O i l Pr ess ur e - Low F u n c tio n is th e p rim a ry s c ra m s ig n a l fo r th e tu rb in e trip e v e n t a n a ly ze d in R ef er ence 5. For t hi s ev ent , t he r eact or sc r am r educ es t he am ount of ener gy r equi r ed t o be ab sor bed and , al ong wi t h t he ac t i ons of t he End of C y cl e R eci r cul at i on Pum p T r i p (EO C-R PT) Sy st em , ens ur es t hat t he M C PR SL i s no t ex ceed ed.T ur bi ne St op Val v e C l osur e, T r i p O i l Pr ess ur e - Low s i gnal s ar e i ni t i at ed b y th e e le c tro h yd ra u li c c o n tro l (E H C) f lu id p re s s u re a t e a c h s to p v a lv e. T wo i ndepen dent pr ess ur e t r ansm i t t er s ar e as soc i at ed wi t h eac h st op v a l v e. On e o f t h e t w o t r a n s m i t t e r s p r o v i d e s i n p u t t o RPS t r i p s y s t e m A;t he ot her , t o R PS t r i p sy st em B. T hus, eac h R PS t r i p sy st em r ecei v es a n i nput f r om f our T ur bi ne St op Val v e C l osur e, T r i p O i l Pr ess ur e - Low chan nel s, eac h co nsi st i ng of one pr ess ur e t r ansm i t t er. T he l ogi c f or t he T ur bi ne St op Val v e C l osur e, T r i p O i l Pr ess ur e - Low Func t i on i s s uch t hat t h r e e o r mo r e TS V s mu s t b e c l o s e d t o p r o d u c e a s c r a m.Th i s F u n c t i o n mu s t b e e n a b l e d a t THE RM A L P OW E R $ 4 0% R T P. T h is i s no r m al l y acc om pl i shed aut om at i cal l y by pr ess ur e t r ansm i t t er s s ensi ng t ur bi ne f i r st st age pr ess ur e; t her ef or e, t o co nsi der t hi s Func t i on OPERAB L E, t h e t u r b i n e b y p a s s v a l v e s mus t r e m a i n s h u t a t THERMAL P OW E R $ 40% R T P. T he s et poi nt i s f eedwat er t em per at ur e depen dent as a r esul t of t he s ubco ol i ng c hanges t hat af f ect t he t ur bi ne f i r st st age pr ess ur e/r eact or power r el at i onsh i p. For R T P oper at i on wi t h f eedwat er t em per at ur e $ 4 2 0°F , a n a l l o w a b l e s e t p o i n t o f # 2 6.9% o f co n t r o l va l ve w id e o p e n tu rb in e f irs t s ta g e p re s s u re is p ro v id e d b y th e b yp a s s f u n c tio n. T he al l owabl e se t poi nt i s r educ ed t o # 22.5% of con t r ol v al v e wi de open tu rb i n e firs t s ta g e p re s s u re fo r R T P o p e ra ti o n w i th fe e d w a te r te m p e ra tu re> 37 0°F a nd < 42 0°F.T he T ur bi ne St op Val v e C l osur e, T r i p O i l Pr ess ur e - Low Al l owabl e Val ue i s s el ect ed t o be hi gh enou gh t o det ect i m m i nent T SV cl osur e t her eby re d u c in g th e s e v e rity o f th e s u b s e q u e n t p re s s u re tra n s ie n t.

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-23 R ev. 3.0, 03/31/04 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)Ei ght cha nnel s of T ur bi ne St op Val v e C l osur e, T r i p O i l Pr ess ur e - Low Funct i on, wi t h f our cha nnel s i n eac h t r i p sy st em , ar e r equi r ed t o be O PE R AB LE t o ens ur e t hat no s i ngl e i nst r um ent f ai l ur e wi l l pr ecl ude a s c ra m f ro m th is F u n c tio n e v e n if o n e T S V s h o u ld f a il to c lo s e. T h is Funct i on i s r equi r ed, con si st ent wi t h anal y si s as sum pt i ons, whenev er T H E R M A L P O W E R i s $ 40% R T P. T hi s Func t i on i s no t r equi r ed when TH E R M A L P OW E R i s < 4 0% RT P s i n c e t h e R e a c t o r V e s s e l S t e a m D o me Pr ess ur e - H i gh and t he Av er age Power R ange Moni t or Fi x ed Neut r on F lu x - H ig h F u n c tio n s a re a d e q u a te to m a in ta in th e n e c e s s a ry s a f e ty m ar gi ns.10. T ur bi ne Cont r ol Val v e Fast C l osur e, T r i p O i l Pr ess ur e - Low Fast cl osur e of t he T C Vs r esul t s i n t he l oss of a heat si nk t hat pr oduc es r eact or pr ess ur e, neut r on f l ux , and he at f l ux t r ansi ent s t hat m ust be li m ite d. T h e re f o re , a re a c to r s c ra m is in iti a te d o n T C V f a s t c lo s u re in ant i ci pat i on o f t he t r ansi ent s t hat wo ul d r esul t f r om t he cl osur e of t hese v al v es. T he T ur bi ne Cont r ol Val v e Fast C l osur e, T r i p O i l Pr ess ur e - Low Funct i on i s t he pr i m ar y sc r am si gnal f or t he gene r at or l oad r ej ect i on ev ent anal y z ed i n R ef er ence 5. For t hi s ev ent , t he r eact or sc r am r educ es t he am ount of ener gy r equi r ed t o be ab sor bed and , al ong wi t h t he ac t i ons of t he EO C-R PT Sy st em , ens ur es t hat t he MC PR SL i s no t ex ceed ed.T u rb i n e C o n tro l V a l v e F a s t C l o s u re , T ri p O i l P re s s u re - L o w s i g n a l s a re i ni t i at ed by t he EH C f l ui d pr ess ur e at eac h co nt r ol v al v e. T her e i s on e pr ess ur e t r ansm i t t er ass oci at ed wi t h eac h co nt r ol v al v e, t he s i gnal f r om e a c h tra n s m itte r b e in g a s s ig n e d to a s e p a ra te R P S lo g ic c h a n n e l. T h is F u n c t i o n mu s t b e e n a b l e d a t THE RM A L P OW E R $ 4 0% R T P. T h is is nor m al l y acc om pl i shed aut om at i cal l y by pr ess ur e t r ansm i t t er s s ensi ng t ur bi ne f i r st st age pr ess ur e; t her ef or e, t o co nsi der t hi s Func t i on OPERAB L E, t h e t u r b i n e b y p a s s v a l v e s mus t r e m a i n s h u t a t THERMAL P OW E R $ 40% R T P. T he b asi s f or t he se t poi nt of t hi s aut om at i c by pass is id e n tic a l to th a t d e s c rib e d f o r th e T u rb in e S to p V a lv e C lo s u re , T rip O il Pr ess ur e - Low Func t i on.T he T ur bi ne Cont r ol Val v e Fast C l osur e, T r i p O i l Pr ess ur e - Low A l l ow abl e V al ue i s sel ect ed h i gh e nou gh t o de t ect i m m i nen t T C V f ast cl osur e.

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-24 R ev. 3.0, 03/31/04 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)Four cha nnel s of T ur bi ne Cont r ol Val v e Fast C l osur e, T r i p O i l Pr ess ur e -Low Funct i on, wi t h t wo cha nnel s i n eac h t r i p sy st em ar r anged i n a one-o u t-o f-tw o lo g ic , a re re q u ire d to b e O P E R A B L E to e n s u re th a t n o s in g le in s tru m e n t fa il u re w il l p re c lu d e a s c ra m f ro m th is F u n c tio n o n a v a li d s ig n a l. T h is F u n c tio n is re q u ire d , c o n s is te n t w ith th e a n a ly s is assum pt i ons, wh ene v er T H E R M A L P O W E R i s $ 4 0% R T P. T h is Fu nct i on i s not r equ i r ed w hen T H E R M A L P O W E R i s < 40% R T P si nce t he React or Vessel St eam D om e Pr ess ur e - H i gh and t he Av er age Power R a n g e M o n ito r F ix e d N e u tro n F lu x - H ig h F u n c tio n s a re a d e q u a te to m ai nt ai n t he n ecessa r y saf et y m ar gi ns.11. R eact or Mode S wi t ch - Shut down Posi t i on T he R eact or M ode S wi t ch - S hut dow n P osi t i on F unct i on p r ovi des si gna l s, v ia th e m a n u a l s c ra m lo g ic c h a n n e ls , th a t a re re d u n d a n t to th e a u to m a tic p ro te c tiv e in s tru m e n ta tio n c h a n n e ls a n d p ro v id e m a n u a l re a c to r trip capa bi l i t y. T hi s Func t i on was not spe ci f i cal l y cr edi t ed i n t he ac ci dent anal y si s, but i t i s r et ai ned f or t he ov er al l r edunda ncy and di v er si t y of t he R P S as r equ i r ed b y t he N R C app r oved l i censi ng b asi s.T he r eact or m ode s wi t ch i s a s i ngl e swi t ch wi t h f our cha nnel s, eac h of wh i ch i npu t s i nt o on e of t he R P S l ogi c chan nel s.T h e re i s n o A l l o w a b l e V a l u e fo r th i s F u n c ti o n s i n c e th e c h a n n e l s a re m e c h a n ic a ll y a c tu a te d b a s e d s o le ly o n re a c to r m o d e s w itc h p o s iti o n. Four cha nnel s of R eact or Mode S wi t ch - Shut down Posi t i on Func t i on, wi t h t wo cha nnel s i n eac h t r i p sy st em , ar e av ai l abl e and r equi r ed t o be O P E R A B L E. T h e R e a c to r M o d e - S w itc h S h u td o w n P o s iti o n F u n c tio n is r equi r ed t o be OP ER AB LE i n MO D ES 1 and 2 , and i n MO D E 5 wi t h any cont r ol r od wi t hdr awn f r om a co r e ce l l con t ai ni ng one or m or e f uel ass em bl i es, si nce t hese ar e t he MO D ES and ot her spe ci f i ed c ondi t i ons when c ont r ol r ods ar e wi t hdr awn.12. Manual Scr am T he Manual Scr am pus h but t on c hannel s pr ov i de s i gnal s, v i a t he m anual s c ra m l o g i c c h a n n e l s , t o e a c h o f th e fo u r R P S l o g i c c h a n n e l s th a t a re r edunda nt t o t he aut om at i c pr ot ect i v e i nst r um ent at i on c hannel s an d p ro v id e m a n u a l re a c to r trip c a p a b il ity. T h is F u n c tio n w a s n o t s p e c ific a ll y c re d ite d in th e a c c id e n t a n a ly s is , b u t it i s re ta in e d f o r th e o v e ra ll r edunda ncy and di v er si t y of t he RP S as r equi r ed by t he NR C appr ov ed l i censi ng b asi s.

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-25 R ev. 3.0, 03/31/04 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)Th e r e i s o n e Ma n u a l Sc r a m p u s h b u t t o n c h a n n e l f o r e a c h o f t h e f o u r RPS l ogi c c hannel s. I n or der t o ca use a sc r am i t i s ne ces sar y t hat at l east one chan nel i n eac h t r i p sy st em be ac t uat ed.T h e re i s n o A l l o w a b l e V a l u e fo r th i s F u n c ti o n s i n c e th e c h a n n e l s a re m e c h a n ic a ll y a c tu a te d b a s e d s o le ly o n th e p o s iti o n o f th e p u s h b u tto n s. Four cha nnel s of Manual Scr am wi t h t wo cha nnel s i n eac h t r i p sy st em ar r anged i n a one-out-of-t wo l ogi c, ar e av ai l abl e and r equi r ed t o be O PE R AB LE i n MO D ES 1 and 2 , and i n MO D E 5 wi t h any con t r ol r od wi t hdr aw n f r om a cor e cel l cont ai ni ng o ne o r m or e f uel assem bl i es, si nce t hese ar e t he MO D ES and ot her spe ci f i ed c ondi t i ons when c ont r ol r ods ar e wi t hdr awn.A C T IO N S

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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.--------------------------------------------------------------------------------------------------A No t e h a s b e e n p r o v i d e d t o mod i f y t h e ACTI ONS r e l a t e d t o RPS i nst r um ent at i on c hannel s. Sect i on 1.3, C om pl et i on T i m es, spe ci f i es t hat once a C ond i t i on h as be en e nt er ed, subse que nt di v i si ons, subsy st em s, com ponent s, or v ar i abl es e x pr ess ed i n t he Condi t i on, di sc ov er ed t o be i noper abl e or not wi t hi n l i m i t s, wi l l not r esul t i n se par at e ent r y i nt o t he C ondi t i on. Sect i on 1.3 al so s peci f i es t hat R equi r ed Act i ons of t he C ondi t i on c ont i nue t o appl y f or eac h addi t i onal f ai l ur e, wi t h C om pl et i on T i m es b ased on i ni t i al ent r y i nt o t he Condi t i on. H owev er , t he Requi r ed A c tio n s f o r in o p e ra b le R P S in s tru m e n ta tio n c h a n n e ls p ro v id e a p p ro p ria te c o m p e n s a to ry m e a s u re s f o r s e p a ra te , in o p e ra b le c h a n n e ls. A s s u c h , a N ot e ha s bee n pr ovi ded t hat al l ow s sepa r at e C ond i t i on e nt r y f or each in o p e ra b le R P S in s tru m e n ta tio n c h a n n e l.A.1 a n d A.2 Because of t he di v er si t y of sen sor s av ai l abl e t o pr ov i de t r i p si gnal s an d t he r edunda ncy of t he RP S desi gn, an al l owabl e out of ser v i ce t i m e of 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> s ha s be en s hown t o be ac cept abl e (R ef. 10) t o per m i t r est or at i on of any i noper abl e ch annel t o O PE R AB LE st at us. H owev er , t hi s ou t of s e r v ic e tim e is o n ly a c c e p ta b le p r o v id e d th e a s s o c ia te d F u n c tio n's i noper abl e ch annel i s i n one t r i p sy st em and t he Func t i on s t i l l m ai nt ai ns R P S trip c a p a b il ity (re f e r to R e q u ire d A c tio n s B.1 , B.2 , a n d C.1 B a s e s). If t he i noper abl e ch annel can not be r est or ed t o O PE R AB LE st at us wi t hi n R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-26 R ev. 3.0, 03/31/04 BAS ES AC T I O N S (cont i nued)th e a ll o w a b le o u t o f s e rv ic e tim e , th e c h a n n e l o r th e a s s o c ia te d trip s ys te m m u s t b e p la c e d in th e trip p e d c o n d iti o n p e r R e q u ire d A c tio n s A.1 a n d A.2. P la c in g th e in o p e ra b le c h a n n e l i n trip (o r th e a s s o c ia te d trip s ys te m in tr ip) w o u ld c o n s e r v a tiv e ly c o m p e n s a te f o r th e in o p e r a b ility, re s to re c a p a b il ity to a c c o m m o d a te a s in g le f a il u re , a n d a ll o w o p e ra tio n to c o n tin u e. A lte rn a te ly , if it is n o t d e s ire d to p la c e th e c h a n n e l (o r trip sy st em) i n t r i p (e.g., as i n t he c ase wher e pl aci ng t he i noper abl e ch annel in trip w o u ld re s u lt i n a f u ll s c ra m), C o n d iti o n D m u s t b e e n te re d a n d its R equi r ed Act i on t aken.B.1 a n d B.2 C ondi t i on B ex i st s when , f or any one or m or e Funct i ons, at l east one r equi r ed c hannel i s i noper abl e i n eac h t r i p sy st em. I n t hi s c ondi t i on, p ro v id e d a t le a s t o n e c h a n n e l p e r trip s ys te m is O P E R A B L E , th e R P S s til l m ai nt ai ns t r i p ca pabi l i t y f or t hat Funct i on, but can not acc om m odat e a si ngl e f ai l ur e i n ei t her t r i p sy st em.R equi r ed Act i ons B.1 and B.2 l i m i t t he t i m e t he RP S scr am l ogi c f or any F u n c tio n w o u ld n o t a c c o m m o d a te s in g le f a il u re in b o th trip s ys te m s (e.g., one-out-of-one and one-out-of-one ar r angem ent f or a t y pi cal f our cha nnel Funct i on). T he r educ ed r el i abi l i t y of t hi s l ogi c ar r angem ent was n ot ev al uat ed i n R ef er ence 10 f or t he 12 h our C om pl et i on T i m e. W i t hi n t he 6 h o u r a ll o w a n c e , th e a s s o c ia te d F u n c tio n w il l h a v e a ll re q u ire d c h a n n e ls ei t her O PE R AB LE or i n t r i p (or i n any com bi nat i on) i n one t r i p sy st em.C om pl et i ng one of t hese R equi r ed Act i ons r est or es RP S t o an eq ui v al ent r el i abi l i t y l ev el as t hat ev al uat ed i n R ef er ence 10, whi ch j ust i f i ed a 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> al l owabl e out of ser v i ce t i m e as pr esen t ed i n C ondi t i on A. T he tri p s y s te m i n th e m o re d e g ra d e d s ta te s h o u l d b e p l a c e d i n tri p o r, al t er nat i v el y , al l t he i noper abl e ch annel s i n t hat t r i p sy st em sho ul d be p la c e d in trip (e.g., a trip s ys te m w ith tw o in o p e ra b le c h a n n e ls c o u ld b e in a m o re d e g ra d e d s ta te th a n a trip s ys te m w ith f o u r in o p e ra b le c h a n n e ls , if t he t wo i noper abl e ch annel s ar e i n t he s am e Funct i on whi l e t he f our in o p e ra b le c h a n n e ls a re a ll in d iff e re n t F u n c tio n s). T h e d e c is io n a s to whi ch t r i p sy st em i s i n t he m or e degr aded s t at e sh oul d be ba sed on pr udent j udgm ent and c ur r ent pl ant con di t i ons (i.e., what MO D E t he pl ant is in). If th is a c tio n w o u ld re s u lt i n a s c ra m o r re c irc u la tio n p u m p trip , it i s p e rm is s ib le to p la c e th e o th e r trip s ys te m o r its in o p e ra b le c h a n n e ls in t r i p.

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-27 R ev. 3.0, 03/31/04 BAS ES AC T I O N S (cont i nued)T he 6 ho ur C om pl et i on T i m e i s j udged a cc ept abl e bas ed on t he re m a in in g c a p a b il ity to trip , th e d iv e rs ity o f th e s e n s o rs a v a il a b le to pr ov i de t he t r i p si gnal s, t he l ow pr obabi l i t y of ex t ensi v e num ber s of i noper abi l i t i es a f f ect i ng al l di v er se Func t i ons, and t he l ow pr obabi l i t y of an e v e n t r e q u i r i n g t h e i n i t i a t i o n o f a s c r a m.A lte rn a te ly , if it is n o t d e s ire d to p la c e th e in o p e ra b le c h a n n e ls (o r o n e trip sy st em) i n t r i p (e.g., as i n t he c ase wher e pl aci ng t he i noper abl e ch annel o r a s s o c i a te d tri p s y s te m i n tri p w o u l d re s u l t i n a s c ra m [o r R P T]), C ondi t i on D m ust be ent er ed and i t s Requi r ed Act i on t aken.C.1 R e q u i re d A c ti o n C.1 i s i n te n d e d to e n s u re th a t a p p ro p ri a te a c ti o n s a re ta k e n if m u lti p le , in o p e ra b le , u n trip p e d c h a n n e ls w ith in th e s a m e trip s y s t e m f o r t h e s a m e Fu n c t i o n r e s u l t i n t h e Fu n c t i o n n o t mai n t a i n i n g RPS trip c a p a b il ity. A F u n c tio n is c o n s id e re d to b e m a in ta in in g R P S trip capa bi l i t y when s uf f i ci ent cha nnel s ar e O PE R AB LE or i n t r i p (or t he a s s o c ia te d trip s ys te m is in trip), s u c h th a t b o th trip s ys te m s w il l g e n e ra te a t r i p si gnal f r om t he gi v en Func t i on on a v al i d si gnal. For t he t y pi cal F u n c t i o n w i t h o n e-o u t-o f-t w o t a k e n t w i c e l o g i c a n d t h e I RM a n d A P RM Funct i ons, t hi s woul d r equi r e bot h t r i p sy st em s t o hav e one c hannel O PE R AB LE or i n t r i p (or t he as soc i at ed t r i p sy st em i n t r i p). For F u n c tio n 6 (M a in S te a m Is o la tio n V a lv e - C lo s u re), th is w o u ld re q u ire b o th t r i p sy st em s t o hav e eac h ch annel ass oci at ed wi t h t he MS I Vs i n t hr ee M SLs (not nec ess ar i l y t he s am e MS Ls f or bot h t r i p sy st em s), O PE R AB LE o r i n tri p (o r th e a s s o c i a te d tri p s y s te m i n tri p).F o r F u n c tio n 9 (T u rb in e S to p V a lv e C lo s u re , T rip O il P re s s u re - L o w), th is woul d r equi r e bot h t r i p sy st em s t o hav e t hr ee c hannel s, eac h O PE R AB LE o r i n tri p (o r th e a s s o c i a te d tri p s y s te m i n tri p).T h e C o m p le tio n T im e is in te n d e d to a ll o w th e o p e ra to r tim e to e v a lu a te a n d re p a ir a n y d is c o v e re d in o p e ra b il iti e s. T h e 1 h o u r C o m p le tio n T im e is acc ept abl e bec ause i t m i ni m i z es r i sk whi l e al l owi ng t i m e f or r est or at i on or t r i ppi ng o f chan nel s.

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-28 R ev. 3.0, 03/31/04 BAS ES AC T I O N S (cont i nued)D.1 R equi r ed Act i on D.1 di r ect s en t r y i nt o t he appr opr i at e C ondi t i on r ef er ence d i n T abl e 3.3.1.1-1. T he appl i cabl e C ondi t i on s peci f i ed i n t he T abl e i s Func t i on and M O D E or ot her spe ci f i ed c ondi t i on depe ndent and m a y c h a n g e a s th e R e q u ire d A c tio n o f a p re v io u s C o n d iti o n is c o m p le te d. Each t i m e an i noper abl e ch annel has not m et any R equi r ed Act i on of C ondi t i on A, B, or C , and t he as soc i at ed Com pl et i on T i m e has ex pi r ed, C o n d iti o n D w il l b e e n te re d f o r th a t c h a n n e l a n d p ro v id e s f o r tra n s f e r to t he appr opr i at e su bseq uent C ondi t i on.E.1 , F.1 , G.1 , a n d H.1 I f t he c hannel (s) i s no t r est or ed t o O PE R AB LE st at us o r pl aced i n t r i p (or t he as soc i at ed t r i p sy st em pl aced i n t r i p) wi t hi n t he al l owed Com pl et i on T im e , th e p la n t m u s t b e p la c e d in a M O D E o r o th e r s p e c ifie d c o n d iti o n in whi ch t he LCO does not appl y. T he Com pl et i on T i m es a r e r easo nabl e, b a s e d o n o p e ra tin g e x p e rie n c e , to re a c h th e s p e c ifie d c o n d iti o n f ro m f u ll power con di t i ons i n an or der l y m anner and wi t hout cha l l engi ng pl ant s ys te m s. In a d d iti o n , th e C o m p le tio n T im e o f R e q u ire d A c tio n E.1 is c o n s i s t e n t w i t h t h e Co mp l e t i o n Ti me p r o v i d e d i n L CO 3.2.2 , " MI NI MU M C R IT IC A L P O W E R R A T IO (M C P R)." I.1 I f t he c hannel (s) i s no t r est or ed t o O PE R AB LE st at us o r pl aced i n t r i p (or t he as soc i at ed t r i p sy st em pl aced i n t r i p) wi t hi n t he al l owed Com pl et i on T im e , th e p la n t m u s t b e p la c e d in a M O D E o r o th e r s p e c ifie d c o n d iti o n in whi ch t he LCO does not appl y. T hi s i s do ne by i m m edi at el y i ni t i at i ng act i on t o f ul l y i nser t al l i nser t abl e co nt r ol r ods i n co r e ce l l s c ont ai ni ng one or m or e f uel ass em bl i es. C ont r ol r ods i n co r e ce l l s c ont ai ni ng no f uel ass em bl i es d o not af f ect t he r eact i v i t y of t he c or e and a r e, t her ef or e, not r equi r ed t o be i nser t ed. Act i on m ust con t i nue unt i l al l i nser t abl e co nt r ol ro d s in c o re c e ll s c o n ta in in g o n e o r m o re f u e l a s s e m b li e s a re f u ll y i nser t ed.S U R V E IL L A N C E

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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.--------------------------------------------------------------------------------------------------BAS ES SU R VE I LLAN C E R EQ U I R EM EN T S (cont i nued)

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-29 R ev. 3.0, 03/31/04-------------------------------- R E V IE W E R'S N O T E ------------------------------------T he Not es i n T abl e 3.3.1.1-1 r equi r i ng r eset of t he c hannel t o a pr ede f i ned as-l ef t t ol er ance and t he ver i f i cat i on o f t he a s-f oun d t ol er ance a re o n l y a s s o c i a te d w i th S L-L S S S v a l u e s. T h e re fo re , t h e N o te s a re a p p l i e d t o s p e c i f i c S R s f o r t h e a s s o c i a t e d f u n c t i o n s i n t h e S R c o l u mn o n l y. T h e N o t e s ma y b e p l a c e d a t t h e t o p o f t h e A l l o w a b l e V a l u e c o l u mn i n t he T abl e and a ppl i ed t o al l Funct i ons wi t h al l owabl e v al ues i n t he t abl e.---------------------------------------------------------------------------------------------------------------------------------- R E V IE W E R'S N O T E ------------------------------------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 R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-30 R ev. 3.0, 03/31/04 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.--------------------------------------------------------------------------------------------------As n o t e d a t t h e b e g i n n i n g o f t h e SRs , t h e SRs f o r e a c h RPS i nst r um ent at i on Func t i on ar e l ocat ed i n t he SR s c ol um n of T abl e 3.3.1.1-1.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 t r i p ca pabi l i t y. U pon c om pl et i on of t he Sur v ei l l ance , or ex pi r at i on of t he 6 hour6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> 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 th e a p p li c a b le C o n d iti o n e n te re d a n d R e q u ire d A c tio n s ta k e n. T h is N o te i s ba sed on t he RP S r el i abi l i t y anal y si s (R ef. 10) ass um pt i on of t he a v e ra g e tim e re q u ire d to p e rf o rm c h a n n e l s u rv e il la n c e. T h a t a n a ly s is d e m o n s tra te d th a t th e 6 h o u r te s tin g a ll o w a n c e d o e s n o t s ig n ific a n tly r e d u c e th e p r o b a b ility t h a t th e R P S w ill tr ip w h e n n e c e s s a r y.S R 3.3.1.1.1 Per f or m ance of t he CH AN N EL C H EC K once ev er y 12 hou r s en sur es t hat a g r o s s f a i l u r e o f i n s t r u me n t a t i o n h a s n o t o c c u r r e d. A CH A NN E L CH E CK i s no r m al l y a co m par i son of t he par am et er i ndi cat ed on o ne c hannel t o a si m i l ar par am et er on ot her cha nnel s. I t i s ba sed on t he as sum pt i on t hat i nst r um ent cha nnel s m oni t or i ng t he s am e par am et er sho ul d r ead appr ox i m at el y t he s am e v al ue. Si gni f i cant dev i at i ons bet ween t he i n s t ru m e n t c h a n n e l s c o u l d b e a n i n d i c a t i o n o f e xc e s s i ve i n s t ru m e n t d ri ft o n o n e o f t h e c h a n n e l s o r s o m e t h i n g e v e n mor e s e r i o u s. A CHANNE L C H EC K wi l l det ect gr oss cha nnel f ai l ur e; t hus, i t i s k ey t o v er i f y i ng t he i n s t r u m e n t a t i o n c o n t i n u e s t o o p e r a t e p r o p e r l y b e t w e e n e a c h CHANNEL CA L I B RA TI ON.Agr eem ent cr i t er i a ar e det er m i ned by t he pl ant st af f bas ed on a com bi nat i on of t he c hannel i nst r um ent unc er t ai nt i es, i ncl udi ng i ndi cat i on and r eadabi l i t y. I f a ch annel i s ou t si de t he c r i t er i a, i t m ay be an i ndi cat i on th a t th e in s tru m e n t h a s d rif te d o u ts id e its li m it.T he agr eem ent cr i t er i a i ncl udes an ex pect at i on of one de cade of ov er l ap when t r ansi t i oni ng bet ween neu t r on f l ux i nst r um ent at i on. T he ov er l ap bet ween SR M s an d I R M s m ust be dem onst r at ed pr i or t o wi t hdr awi ng SR M s f r om t he f ul l y i nser t ed pos i t i on s i nce i ndi cat i on i s be i ng t r ansi t i oned f r om t he SR M s t o t he I R M s. T hi s wi l l ens ur e t hat r eact or power wi l l not be i ncr ease d i nt o a neu t r on f l ux r egi on wi t hout adequa t e i ndi cat i on. T he ov er l ap bet ween I R M s an d AP R M s i s of con cer n when r educ i ng power i n to th e IR M ra n g e (e n try i n to M O D E 2 fro m M O D E 1). O n p o w e r R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-31 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)i ncr ease s, t he s y st em des i gn wi l l pr ev ent f ur t her i ncr ease s (by i ni t i at i ng a r o d b l o c k) i f a d e q u a t e o v e r l a p i s n o t mai n t a i n e d. Ov e r l a p b e t w e e n I RMs a n d A P R M s e xi s t s w h e n s u ff i c i e n t I R M s a n d A P R M s c o n c u r r e n t l y h a ve o n s c a l e r e a d i n g s s u c h t h a t t h e t r a n s i t i o n b e t w e e n MODE 1 a n d MODE 2 c a n b e m a d e w ith o u t e ith e r A P R M d o w n s c a le ro d b lo c k o r IR M u p s c a le r od bl ock. O v er l ap bet ween SR M s an d I R M s s i m i l ar l y ex i st s when , pr i or t o w i t h d r a w i n g t h e S R M s fr o m t h e ful l y i n s e r t e d p o s i t i o n , I R M s a r e a b o ve m i d-scal e on R ang e 1 b ef or e S R M s have r each ed t he u pscal e r od b l ock.I f o v e r l a p f o r a g r o u p o f c h a n n e l s i s n o t d e mo n s t r a t e d (e.g., I RM/A P RM ov er l ap), t he r easo n f or t he f ai l ur e of t he Sur v ei l l ance sho ul d be d e te rm in e d a n d th e a p p ro p ria te c h a n n e ls (s) d e c la re d in o p e ra b le. O n ly t hose appr opr i at e ch annel s t hat ar e r equi r ed i n t he c ur r ent MO D E or cond i t i on s houl d be de cl ar ed i noper abl e.T he Fr equenc y i s ba sed upon op er at i ng ex per i ence t hat dem onst r at es c h a n n e l fa il u re is ra re. T h e C H A N N E L C H E C K s u p p le m e n ts le s s f o rm a l, but m or e f r equent , che ck s of cha nnel s du r i ng nor m al oper at i onal use of t h e d i s p l a y s a s s o c i a t e d w i t h t h e c h a n n e l s r e q u i r e d b y t h e L CO.S R 3.3.1.1.2 T o ens ur e t hat t he AP R M s ar e ac cur at el y i ndi cat i ng t he t r ue c or e av er age p o w e r , t h e A P R M s a r e c a l i b r a t e d t o t h e r e a c t o r p o w e r c a l c u l a t e d f r o m a h e a t b a la n c e. L C O 3.2.4 , "A v e ra g e P o w e r R a n g e M o n ito r (A P R M) G a in and Set poi nt s," al l ows t he AP R M s t o be r eadi ng gr eat er t han ac t ual T H ER M AL P O W ER t o co m pens at e f or l ocal i z ed power peak i ng. W hen th is a d ju s tm e n t is m a d e , th e re q u ire m e n t fo r th e A P R M s to in d ic a te w ith in 2% R T P o f c a lc u la te d p o w e r is m o d ifie d to re q u ire th e A P R M s to in d ic a te w ith in 2% R T P o f c a lc u la te d M F L P D. T h e F r e q u e n c y o f o n c e p e r 7 d a ys i s ba sed on m i nor cha nges i n LPR M sen si t i v i t y , whi ch c oul d af f ect t he AP R M r eadi ng bet ween per f or m ance s of SR 3.3.1.1.6.A r est r i ct i on t o sa t i sf y i ng t hi s SR when < 25% R T P i s pr ov i ded t hat re q u ire s th e S R to b e m e t o n ly a t $ 2 5% R T P b e c a u s e it i s d iff ic u lt to a c c u r a t e l y mai n t a i n APRM i n d i c a t i o n o f c o r e THERMAL POW ER c o n s is te n t w ith a h e a t b a la n c e w h e n < 2 5% R T P. A t lo w p o w e r le v e ls , a hi gh degr ee of acc ur acy i s un nece ss ar y bec ause of t he l ar ge i nher ent m a rg in to th e rm a l l im its (M C P R a n d A P L H G R). A t $ 25% R T P, t he R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-32 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 i s r equi r ed t o hav e been sat i sf act or i l y per f or m ed wi t hi n t he l as t 7 d ay s i n a c c or da nc e w i t h SR 3.0.2. A Not e i s pr ov i de d w hi c h a l l ow s a n in c re a s e in T H E R M A L P O W E R a b o v e 2 5% if th e 7 d a y F re q u e n c y i s n o t m e t p e r S R 3.0.2. In th is e v e n t, th e S R m u s t b e p e rf o rm e d w ith in 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> s af t er r each i ng or ex ceed i ng 25% R T P. T wel v e hour s i s ba sed o n o p e ra tin g e x p e rie n c e a n d in c o n s id e ra tio n o f p ro v id in g a re a s o n a b le t i me i n w h i c h t o c o mp l e t e t h e S R.S R 3.3.1.1.3 T he Av er age Power R ange Moni t or Fl ow Bi ased Si m ul at ed T her m al Power - H i gh Func t i on us es t he r eci r cul at i on l oop dr i v e f l ows t o v ar y t he t r i p se t poi nt. T hi s SR ens ur es t hat t he t ot al l oop dr i v e f l ow si gnal s f r om t he f l ow uni t use d t o v ar y t he s et poi nt ar e appr opr i at el y com par ed t o a c a li b ra te d f lo w s ig n a l a n d th e re f o re th e A P R M F u n c tio n a c c u ra te ly r ef l ect s t he r equi r ed s et poi nt as a f unct i on of f l ow. Each f l ow si gnal f r om t he r espe ct i v e f l ow uni t m ust be # 1 0 5% o f th e c a li b ra te d f lo w s ig n a l. If t he f l ow uni t si gnal i s no t wi t hi n t he l i m i t , t he AP R M s t hat r ecei v e an i nput f r om t he i noper abl e f l ow uni t m ust be dec l ar ed i noper abl e.T he Fr equenc y of 7 day s i s ba sed on engi neer i ng j udgm ent , oper at i ng ex per i ence , and t he r el i abi l i t y of t hi s i nst r um ent at i on.S R 3.3.1.1.4 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 app l i cabl e ext ensi ons.Any set poi nt adj ust m ent sha l l be c onsi st ent wi t h t he as sum pt i ons of t he 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.

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-33 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)As not ed, SR 3.3.1.1.4 i s no t r equi r ed t o be pe r f or m ed when e nt er i ng M O D E 2 f r om MO D E 1 si nce t est i ng of t he MO D E 2 r equi r ed I R M and AP R M Funct i ons cann ot be per f or m ed i n MO D E 1 wi t hout ut i l i z i ng ju m p e rs , li f te d le a d s , o r m o v a b le li n k s. T h is a ll o w s e n try in to M O D E 2 if t he 7 day Fr equ ency i s not m et per S R 3.0.2. I n t hi s event , t he S R m ust b e p e rf o rm e d w ith in 1 2 h o u rs a f te r e n te rin g M O D E 2 f ro m M O D E 1. T wel v e hour s i s ba sed on oper at i ng ex per i ence and i n co nsi der at i on of p r o v i d i n g a r e a s o n a b l e t i me i n w h i c h t o c o mp l e t e t h e S R.A F r equenc y of 7 day s pr ov i des an ac cept abl e l ev el of sy st em av er age u n a v a il a b il ity o v e r th e F re q u e n c y i n te rv a l a n d is b a s e d o n re li a b il ity a n a l y s i s (R e f. 1 0).S R 3.3.1.1.5 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 appl i cabl e ex t ensi ons. I n ac cor danc e wi t h R ef er ence 10, t he s cr am c o n ta c ts m u s t b e te s te d a s p a rt o f th e M a n u a l S c ra m F u n c tio n. A Fr equenc y of 7 day s pr ov i des an ac cept abl e l ev el of sy st em av er age av ai l abi l i t y ov er t he Fr equenc y and i s ba sed on t he r el i abi l i t y anal y si s of Re f e r e n c e 1 0. (Th e Ma n u a l Sc r a m Fu n c t i o n's CHANNEL FUNCTI ONAL T E S T F re q u e n c y w a s c re d ite d in th e a n a ly s is to e x te n d m a n y a u to m a tic s c ra m F u n c tio n s' F re q u e n c ie s.)S R 3.3.1.1.6 LPR M gai n se t t i ngs ar e det er m i ned f r om t he l ocal f l ux pr of i l es m easu r ed by t he T r av er si ng I ncor e Pr obe (T I P) Sy st em. T hi s es t abl i shes t he r e l a t i v e l o c a l f l u x p r o f i l e f o r a p p r o p r i a t e r e p r e s e n t a t i v e i n p u t t o t h e A P RM S y st em. T he 1 000 M W D/T Fr equ ency i s base d on ope r at i ng e x per i ence wi t h LP R M sensi t i v i t y chan ges.

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-34 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)SR 3.3.1.1.7 and SR 3.3.1.1.10 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 t he as sum pt i ons of t he c ur r ent pl ant spe ci f i c s et poi nt m et hodol ogy. T he 92 day Fr equenc y of SR 3.3.1.1.7 i s ba sed on t he r el i abi l i t y anal y si s of R ef er ence 10.T h e 1 8 m o n th F re q u e n c y i s b a s e d o n th e n e e d to p e rf o rm th is Sur v ei l l ance under t he c ondi t i ons t hat appl y dur i ng a pl ant out age and t he pot ent i al f or an unp l anned t r ansi ent i f t he Sur v ei l l ance wer e per f or m ed wi t h t he r eact or at pow er. O per at i ng e x per i ence has sh ow n t hat 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 at t he 1 8 m o n th F r e q u e n c y.S R 3.3.1.1.8 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 T a b l e 3.3.1.1-1. I f t h e t r i p s e t t i n g i s d i s c o ve r e d t o b e l e s s c o n s e r va t i ve t han ac coun t 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 c onse r v at i v e wi t h r espe ct t o t he Al l owabl e Val ue, t he c hannel p e rf o rm a n c e is s til l w ith in th e re q u ire m e n ts o f th e p la n t s a f e ty a n a ly s is. U nder t hese con di t i ons, t he s et 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 hant he [LT SP] wi t hi n t he as-l ef t t ol er ance as 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 h e F re q u e n c y o f 9 2 d a ys f o r S R 3.3.1.1.8 is b a s e d o n th e re li a b il ity anal y si s of R ef er ence 10.

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-35 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 3.3.1.1.8 f o r S L-L S S S a re m o d ifie d b y tw o N o te s a s id e n tifie d in T a b le 3.3.1.1-1. T he f i r st N ot e r equi r es e v al uat i on of cha nnel per f or m ance f or th e c o n d iti o n w h e re th e a s-f o u n d s e ttin g f o r th e c h a n n e l s e tp o in t is out si de i t s as-f ound t ol er ance but con ser v at i v e wi t h r espe ct t o t he Al l owabl e Val ue. Ev al uat i on of i nst r um ent per f or m ance wi l l v er i f y t hat t he in s tru m e n t w il l c o n tin u e to b e h a v e in a c c o rd a n c e w ith s a f e ty a n a ly s is s e tp o in t m e th o d o lo g y a s s u m p tio 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 is to ensu r e co nf 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 C o rre c tiv e A c tio n P ro g ra m. E n try in to th e C o rre c tiv e A c tio n P ro g ra m w il l ensu r e r equi r ed r ev i ew and do cum ent at i on of t he c ondi t i on f or con t i nued O PE R AB I LI T 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 in s tru m e n t b e re tu rn e d to w ith in th e a s-le f t to le ra n c e o f th e [L T S P]. W her e a s et poi nt m or e co nser v at i v e t han t he [LT SP] i s us ed i n t he pl 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 p p li c a b le , w il l b e a p p li e d to th e s u rv e il la n c e p ro c e d u re s e tp o in t. T h is w il l e n s u re th a t 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 ai nt ai ned. 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 set 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 chan nel sha l l be dec l 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].SR 3.3.1.1.9 and SR 3.3.1.1.11 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 t he [LT S P] wi t hi n t he a s-l e ft t o l e r a n c e t o a c c o u n t for i n s t r u m e n t d r i ft s b e t w e e n s u c c e s s i ve c a lib r a tio n s c o n s is te n t w ith th e 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.No t e 1 s t a t e s t h a t n e u t r o n d e t e c t o r s a r e e x c l u d e d f r o m CHANNEL C ALI BR AT I O N bec ause t hey ar e pas si v e dev i ces , wi t h m i ni m al dr i f t , and b e c a u s e o f th e d iff ic u lty o f s im u la tin g a m e a n in g f u l s ig n a l. C h a n g e s in neut r on det ect or sen si t i v i t y ar e co m pens at ed f or by per f or m i ng t he 7 da y c a l o r i me t r i c c a l i b r a t i o n (S R 3.3.1.1.2) a n d t h e 1 0 0 0 MW D/T L P RM cal i br at i on agai nst t he T I Ps (SR 3.3.1.1.6). A seco nd Not e i s pr ov i ded t hat r equi r es t he AP R M and I R M SR s t o be pe r f or m ed wi t hi n 12 ho ur s of e n t e r i n g MOD E 2 f r o m MOD E 1. Te s t i n g o f t h e MOD E 2 A P RM a n d I RM Funct i ons cann ot be per f or m ed i n MO D E 1 wi t hout ut i l i z i ng j um per s, l i f t ed l e a d s , o r mo v a b l e l i n k s. Th i s No t e a l l o w s e n t r y i n t o MOD E 2 f r o m MOD E 1 if th e a s s o c ia te d F re q u e n c y i s n o t m e t p e r S R 3.0.2. T w e lv e h o u rs is R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-36 R ev. 3.0, 03/31/04 base d on op er at i ng ex per i ence and i n co nsi der at i on of pr ov i di ng a re a s o n a b le tim e in w h ic h to c o m p le te th e S R. T h e F re q u e n c y o f S R 3.3.1.1.9 i s b a s e d u p o n t h e a s s u m p t i o n o f a 184 day cal 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 s et poi nt anal y si s. T he Fr equenc y of SR 3.3.1.1.11 i s ba sed on 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 o f t he m agn i t ude of equ i pm ent dr i f t i n t he se t poi nt ana l y si s.SRs 3.3.1.1.9 a nd 3.3.1.1.11 f or SL-LSSS f un c t i on s i s m od i f i ed by t wo N ot es a s i dent i f i ed i n T abl e 3.3.1.1-1. T he f i r st N ot e r equi r es e v al uat i on of cha nnel per f or m ance f or t he c ondi t i on wher e t he as-f ound s et t i ng f or t h e c h a n n e l s e t p o i n t i s o u t s i d e i t s a s-fou n d t o l e r a n c e b u t c o n s e r va t i ve wi t h r espe ct t o t he Al l owabl e Val ue. Ev al uat i on of i nst r um ent 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 c o n tin u e to b e h a v e in acc or danc e wi t h sa f et y anal y si s s et poi nt m et hodol ogy ass um pt i ons. T he pur pose of t he as ses sm ent i s t o ens ur e co nf i denc e i n t he i nst r um ent p e rf o rm a n c e p rio r to re tu rn in g th e in s tru m e n t to s e rv ic e. T h e s e c h a n n e ls 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 C or r ect i v e Act i on Pr ogr am wi l l ens ur e r equi r ed r ev i ew and do cum ent at i on of t he c ondi t i on f or con t i nued OP ER AB I LI T Y. T he s econ d N ot e r equi r es t h a t t h e a s-l e ft s e t t i n g fo r t h e i n s t ru m e n t b e re t u rn e d t o w i t h i n t h e a s-l e ft t ol er ance of t he [LT SP]. W her e a s et poi nt m or e co nser 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 a s-l ef t and as-f oun d t ol er ance s, as ap pl i cabl e, wi l l be a ppl i ed t o t he su r v ei l l ance p ro c e d u re s e tp o in t. T h is w il l e n s u re th a t s u f f ic ie n t m a rg in to th e S a f e ty Li m i t and/or Anal y t i cal Li m i t i s m ai nt ai ned. I f t he as-l ef t i nst r um ent set t i ng c a n n o t b e re tu rn e d to a s e ttin g w ith in th e a s-le f t to le ra n c e o f th e [L T S P], t hen t he i nst r um ent cha nnel sha l l be dec l 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].SR 3.3.1.1.12 T he Av er age Power R ange Moni t or Fl ow Bi ased Si m ul at ed T her m al Power - H i gh Func t i on us es a n el ect r oni c f i l t er ci r cui t t o gener at e a s i gnal pr opor t i onal t o t he c or e T H ER M AL P O W ER f r om t he AP R M neut r on f l ux si gnal. T hi s f i l t er ci r cui t i s r epr esen t at i v e of t he f uel heat t r ansf er dy nam i cs t hat pr oduc e t he r el at i onsh i p bet ween t he neut r on f l ux and t he c o re T H E R M A L P O W E R. T h e f il te r tim e c o n s ta n t m u s t b e v e rif ie d to e n s u re th a t t h e c h a n n e l i s a c c u ra te l y re fle c ti n g th e d e s i re d p a ra m e te r.T he Fr equenc y of 18 m ont hs i s ba sed on engi neer i ng j udgm ent and r el i abi l i t y of t he co m pon ent s.

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-37 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)SR 3.3.1.1.13 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 t r i p l ogi c f or a sp eci f i c c hannel. T he f unct i onal t est i ng of con t r ol r ods, i n LCO 3.1.3, " C ont r ol R od O PE R AB I LI T Y ," and SD V v ent and dr ai n v al v es, i n LCO 3.1.8, " Scr am D is c h a rg e V o lu m e (S D V) V e n t a n d D ra in V a lv e s ," o v e rla p s th is Sur v ei l l ance t o pr ov i de c om pl et e t est i ng of t he as sum ed s af et y f unct i on.T h e 1 8 m o n th F re q u e n c y i s b a s e d o n th e n e e d to p e rf o rm th is Sur v ei l l ance under t he c ondi t i ons t hat appl y dur i ng a pl ant out age and t he pot ent i al f or an unp l anned t r ansi ent i f t he Sur v ei l l ance wer e per f or m ed wi t h t he r eact or at pow er. O per at i ng e x per i ence has sh ow n t hat 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 at t he 1 8 m o n th F r e q u e n c y.SR 3.3.1.1.14 T h i s S R e n s u r e s t h a t s c r a m s i n i t i a t e d fr o m t h e T u r b i n e S t o p V a l ve C l osur e, T r i p O i l Pr ess ur e - Low and T ur bi ne Cont r ol Val v e Fast C l osur e, T r i p O i l Pr ess ur e - Low Func t i ons wi l l not be i nadv er t ent l y by pass ed wh en T H E R M A L P O W E R i s $ 40% R T P. T hi s i nv ol v es c al i br at i on of t he by pass cha nnel s. Adequat e m ar gi ns f or t he i nst r um ent set poi nt m e th o d o lo g y a re in c o rp o ra te d in to th e a c tu a l s e tp o in t. B e c a u s e m a in t u r b i n e b y p a s s f l o w c a n a f f e c t t h i s s e t p o i n t n o n c o n s e r v a t i v e l y (THERMAL PO W ER i s de r i v ed f r om t ur bi ne f i r st st age pr ess ur e), t he m ai n t ur bi ne b y p a s s v a l v e s mu s t r e ma i n c l o s e d a t THE RM A L P OW E R $ 4 0% R T P to ensu r e t hat t he c al i br at i on r em ai ns v al i d.If a n y b y p a s s c h a n n e l s e tp o i n t i s n o n c o n s e rv a ti v e (i.e., th e F u n c ti o n s a re b yp a s s e d a t $ 40% R T P , ei t her due t o op en m ai n t ur bi ne b y pass val v e(s)o r o th e r re a s o n s), t h e n th e a ff e c te d T u rb i n e S to p V a l v e , T ri p O i l P re s s u re- Low and T ur bi ne Cont r ol Val v e Fast C l osur e, T r i p O i l Pr ess ur e - Low Funct i ons ar e co nsi der ed i noper abl e. Al t er nat i v el y , t he by pass cha nnel can be pl aced i n t he c onse r v at i v e co ndi t i on (nonby pass). I f pl aced i n t he nonby pass con di t i on, t hi s SR i s m et and t he c hannel i s c onsi der ed OPERAB L E.T he Fr equenc y of 18 m ont hs i s ba sed on engi neer i ng j udgm ent and r el i abi l i t y of t he co m pon ent s.

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-38 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)SR 3.3.1.1.15 T hi s SR ens ur es t hat t he i ndi v i dual cha nnel r espo nse t i m es a r e l ess t han or equal t o t he m ax i m um v al ues ass um ed i n t he ac ci dent anal y si s. T he R PS R ES PO N SE T I M E accep t ance cr i t er i a ar e i ncl uded i n R ef er ence 11.R P S R E S P ON S E TI M E ma y b e v e r i f i e d b y a c t u a l r e s p o n s e t i me m easu r em ent s i n any ser i es o f seq uent i al , ov er l appi ng, or t ot al cha nnel m easu r em ent s.[-----------------------------------R E V IE W E R'S N O T E----------------------------------T h e fo l l o w i n g B a s e s a re a p p l i c a b l e fo r p l a n ts a d o p ti n g N E D O-3 2 2 9 1-A and/or Suppl em ent 1.--------------------------------------------------------------------------------------------------H owev er , t he s enso r s f or Funct i ons 3, 4, and 5 a r e al l owed t o be ex cl uded f r om spe ci f i c RP S R ES PO N SE T I M E m easu r em ent i f t he cond i t i ons of R ef er ence 12 ar e sa t i sf i ed. I f t hese con di t i ons ar e sa t i sf i ed, sens or r espo nse t i m e m ay be al l ocat ed bas ed on e i t her ass um ed des i gn s e n s o r re s p o n s e tim e o r th e m a n u f a c tu re r's s ta te d d e s ig n re s p o n s e tim e. W hen t he r equi r em ent s of R ef er ence 12 ar e not sat i sf i ed, sen sor r espo nse t i m e m ust be m easu r ed. Fur t her m or e, m easu r em ent of t he i nst r um ent l oops r espo nse t i m es f or Funct i ons 3, 4, and 5 i s no t r equi r ed if th e c o n d iti o n s o f R e f e re n c e 1 3 a re s a tis f ie d.]As n o t e d , n e u t r o n d e t e c t o r s a r e e x c l u d e d f r o m RPS RE SPONSE TI ME t est i ng bec ause t he pr i nci pl es o f det ect or oper at i on v i r t ual l y ens ur e an i nst ant aneous r espo nse t i m e.R P S R E S P O N S E T IM E te s ts a re c o n d u c te d o n a n 1 8 m o n th S T A G G E R E D T E S T B A S IS. N o te 2 re q u ire s S T A G G E R E D T E S T B A S IS Fr equenc y t o be de t er m i ned bas ed on 4 cha nnel s pe r t r i p sy st em , i n l i eu o f th e 8 c h a n n e l s s p e c i fie d i n T a b l e 3.3.1.1-1 fo r th e M S IV C l o s u re Funct i on. T hi s Fr equenc y i s ba sed on t he l ogi c i nt er r el at i onsh i ps o f t he v ar i ous chan nel s r equi r ed t o pr oduc e an RP S scr am si gnal. T her ef or e, st agger ed t est i ng r esul t s i n r espo nse t i m e v er i f i cat i on of t hese dev i ces ev er y 18 m ont hs. T he 18 m ont h Fr equenc y i s c onsi st ent wi t h t he t y pi cal i ndus t r y r ef uel i ng c y cl e and i s ba sed upon pl ant oper at i ng ex per i ence , whi ch s hows t hat r andom f ai l ur es o f i nst r um ent at i on c om ponent s c ausi ng s e rio u s tim e d e g ra d a tio n , b u t n o t c h a n n e l fa il u re , a re in f re q u e n t.

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-39 R ev. 3.0, 03/31/04 BAS ES R EF ER EN C ES 1.

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F S A R , F ig u re [ ].3.

F S A R , S e c tio n [5.2.2].4.

F S A R , S e c tio n [6.3.3].5.

F S A R , C h a p te r [1 5].6.

F S A R , S e c tio n [1 5.4.1].7.

N ED O-23842, " C ont i nuous C ont r ol R od W i t hdr awal i n t he St ar t up R ange," Apr i l 18, 1978.8.

F S A R , S e c tio n [1 5.4.9].9.

Let t er , P. C heck (N R C) t o G. Lai nas (N R C), " BW R Scr am D i sc har ge Sy st em Saf et y Ev al uat i on," D ecem ber 1, 1980.10.

N ED O-30851-P-A, " T echn i cal Speci f i cat i on I m pr ov em ent Anal y ses f or BW R R eact or Pr ot ect i on Sy st em ," Mar ch 1 988.1 1.

F S A R , T a b le [ ].[12.

N ED O-32291-A, " Sy st em Anal y ses For t he El i m i nat i on of Sel ect ed R espo nse T i m e T est i ng Requi r em ent s," O ct ober 1995.13.

N ED O-32291-A, Suppl em ent 1, " Sy st em Anal y ses f or T he E li m in a tio n o f S e le c te d R e s p o n s e T im e T e s tin g R e q u ire m e n ts ," O c to b e r 1 9 9 9.]

R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-40 R ev. 3.0, 03/31/04 T abl e B 3.3.1.1-1 (page 1 of 1)R P S In s tru m e n ta tio n S e n s o r D iv e rs ity In iti a tio n E v e n ts S c ra m S e n s o rs f o r In iti a tin g E v e n ts R PV Var i abl esAnt i ci pat or yFuel (a)(b)(c)(d)(e)(f)(g)M S I V C l o s u r exxxx T u r b i n e T r i p (w/b y p a s s)xxxx G e n e r a t o r T r i p (w/b y p a s s)xxx P re s s u re R e g u l a to r F a i l u re (pr i m ar y pr ess ur e dec r ease)(M SI V cl osur e t r i p)xxxxx P re s s u re R e g u l a to r F a i l u re (pr i m ar y pr ess ur e dec r ease)(Lev el 8 t r i p)xxx P re s s u re R e g u l a to r F a i l u re (pr i m ar y pr ess ur e i ncr ease)xx F e e d w a te r C o n tro l l e r F a i l u re (h ig h re a c to r w a te r le v e l)xxxx F e e d w a te r C o n tro l l e r F a i l u re (lo w re a c to r w a te r le v e l)xxx L o s s o f C o n d e n s e r V a c u u mxxxx Loss of AC Power (l oss of tra n s fo rm e r)xxxx Loss of AC Power (l oss of gr i d con nect i ons)xxxxxx (a)

R eact or Vessel St eam D om e Pr ess ur e - H i gh (b)

R e a c to r V e s s e l W a te r L e v e l - H ig h , L e v e l 8 (c)

R e a c to r V e s s e l W a te r L e v e l - L o w , L e v e l 3 (d)

T u rb i n e C o n tro l V a l v e F a s t C l o s u re (e)

T u rb i n e S to p V a l v e - C l o s u re (f)

M a i n S te a m Is o l a ti o n V a l v e - C l o s u re (g)

Av er age Power R ange Moni t or N eut r on Fl ux - H i gh R PS I nst r um ent at i on B 3.3.1.1 BW R/6 ST S B 3.3.1.1-41 R ev. 3.0, 03/31/04---------------------------------------------R E V IE W E R'S N O T E--------------------------------------------T h is T a b le fo r ill u s tr a ti o n p u r p o s e s o n ly.---------------------------------------------------------------------------------------------------------------------