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## '> . A \ UNITE D STATE S ENVIRONMENTA L PROTECTIO N AGENC Y ^&2. * WASHINGTON . O.C . 2046 0

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## JL K1 2

Mr . Joh n W

. Houglan d Plan t Manage r Sohi o Chemica l Compan y P 0 . 8o x62 8 Lima , Ohi o 4580 2 Oea r Mr . Hougland : Thi s lette r respond s t o you r lette r o f Apri l 2 , 1985 requestin g clarificatio n o f th e reportin g requirement s unde r th e Comprehensiv e Environ menta l Response , Compensation , and Liabilit y Act (CERCLA ) as the y appl y t o ai r . emission s fro m Sohio' s Lima , Ohio , facility . A s state d i n th e preambl e t o th e U . S . Environmenta l Protectio n Agency' s (EPA ) rul e on reportabl e quantit y (RQ) adjustment s (5 0 Federa l Registe r 13456 , Apri l 4 , 1985) , EP

A has no t ye t determine d a genera l polic y wit h respec t t o Federally-permitte d o r continuou s releases . Unti l a genera l polic y i s deter mined , th e Agenc

y wil l evaluat e situation s a s the y aris e on a case-by-case-basis , Ou r view s wit h respec t t o th e situatio n yo u describe d ar e se t fort h below . EP A comment s o n individua l situation s shoul d not b e construe d t o appl y t o release s not specificall y mentioned . Th e Agency' s positio n on thes e issue s i s subjec t t o modificatio n a

s EP A gain s mor

e informatio n an

d develop s a mor

e comprehensiv e policy . The informatio n yo u have supplied , alon g wit h th e man y comment

s receive d durin g th e Agency' s R Q rulemaking , wil l b e mos t helpfu l i n formulatin g tha t comprehensive policy . Exemptio n fo r Federally-Permitte d Release s Sectio n 101(10)(H ) include s withi n th e definitio n o f Federally-permitte d releas e "an y emissio n int o th e ai r subjec t t o a permi t o r contro l regulation " unde r th e Clea n A1 r Act (CAA) . Th e legislativ e histor y on thi s exemptio n indicate s tha t 1 t i s availabl e onl y where CA A control s ar e "specificall y designe d t o limi t o r eliminat e emission s o f a designate d hazardou s pollutan t o r a criteri a pollutant " (Sen . Rep . 848 , 96t h Cong. , 2 d Sess.4 9 (1980)) . EPA' s curren t positio n i s that , wit h respec t t o ai r emissions , th e Federally permitte d releas e exemptio n i s limite d t o release s o f substance s th e emissio n o fwhic h th e permi t o r regulatio n wa s specificall y designe d t o limit .P. 2



### Mr . JohnW . Hougland Pag e Tw o

I ndeterminin g whethe r th e permi t o r regulatio nwa s specificall y designe d t o contro l th e hazardou s substanc e at issue , th e Agenc y wil l conside r th e term s o f th e permi t o r regulation , a s wel l a s any othe r materia l include dinth e pub li c recor dsupportin g th e permi t o r regulation . W e not e tha t i nman y cases , CA

A permit s an

dregulation s ma y

no t b e designe dt o contro l specifi c hazardou s substances . Further , EPA

believe s tha t th e Federally-permitte dreleas e exemptio ni s limite dt o thos e emissio nlevel s tha t ar e allowe do r contemplate db y th e permi t o r regulation . Release s abov e thos e level s i nquantitie s equa l t o o r greate r tha nth e R Q fo r th e substanc e release dar e reportabl e unde r CERCLA . EPA' s curren t interpretatio no f th e applicabilit y o f th e Federally permitte dreleas e exemptio nt o ai r emission s fro m Sohio' s Lima , Ohio , facilit y i s base do

nth e descriptio no f th e facilit y an drelease s i nyou r lette r o f Apri l 2 , 1985 . You r lette r describe s thre e type s o f release s o f gaseou s acrylonitrile , acetonitrile , an dhydroge ncyanid e from a stac k permitte dby th e Ohi o EPA : 0 

### Routin e operatin g emissions ; 0 

### Emission s a s th e resul t o f startu pan d shutdowno f th e reactors ; an d

0 

### Emission s a s th e resul t o f malfunctions . EPA' s presen t interpretatio no f th e applicabilit y o f th e Federally-permitte d releas e exemptio nt o eac ho f thes e type s o f release s i s describe dbelow . Th e RQ s o f acrylonitrile , acetonltrile , an dhydroge ncyanid e ar e 100 , 5000 , an

d1 0 pounds , respectively . I f you r permi t wa s specificall y designe d t o contro l thes e pollutants , EP A woul dconside r release s o f thes e substance s tha t d o no t excee dpermitte dlevel s b y an R Q o r mor e t o b e Federally-permitte d an dexemp t fro

m reportin g requirement s unde r sectio n10 3 o f CERCLA . I t i s no t clea r fro

m you r lette r whethe r release s occurin g durin g startu p an dshutdowno f th e reactor s ar e controlle di nth e facility' s permit . I f thes e emission s ar e controlle db y th e permit , EP A

woul dconside r thes e release s t o b e Federally-permitte d1 f the y d o no t excee dpermitte dlevel s by a nR Q o r more , an dreportin g unde r CERCL A sectio n10 3 woul dno t b e required . Base donestimate s provide di nyou r Apri l 2 , 1985 , letter , release s o f acetonitril e apparentl y woul d no t excee dth e level s achieve dby th e contro l technolog y b y a nR Q o r mor e and , therefore , woul dno t nee dt o b e reported . Release s o f acrylonitril e an dhydroge n cyanid e durin g startu pan dshutdown , however , ma y excee dpermitte dlevel s b y a n R Q o r mor e an

di f s o shoul db e reported . Release s resultin g fro m startu pan

d shutdowntha t ar e no t addresse dby th e permi t o r occu r mor e frequentl y tha n allowe dby

th e permi t woul dno t b e Federally-permitted . Reportin g o f thes e release s woul db e require di f the y equa l o r excee dth e R Q fo r th e particula r substance .P. 3



### Mr . Johnw . Hougland Pag e Thre e Release s du e t o malfunction s o f th e reacto r o r contro l mechanism s are presume dno t t o b e allowe db y th e permit ; therefore , thes e release s woul dno t b e considere dFederally-permitte dreleases . A s wit han y non-permitte drelease s resultin g fro

m startu po r shutdown , release s o f acrylonitrile , acetonitrile , o r hydroge ncyanid e fro

m th e reactor s a s a resul t o f malfunction s mus t b e reporte d unde r sectio n10 3 o f CERCL A i f the y

equa l o r excee dth e R Q fo r th e particula r hazardou s substance . Exemptio nfo r Continuou s Release s Th e limite dreportin g exemptio ni nsectio n103(f)(2 ) o f CERCL A i s availabl e onl y fo r continuou s release s whic har e "stabl e inquantit y an drate. " I

norde r t o b e eligibl e fo r thi s exemption , th e release r mus t hav e notifie dth e Nationa l Respons e Cente r (NRC ) o f th e release s "fo r a perio dsufficien t t o establis hth e continuity , quantit y

an dregularit y

o f suc ha release. " You r lette r doe s no t indicat e complianc e wit hthi s prerequisite . We not e furthe r tha t person s eligibl e fo r th e continuou s releas e exemptio nmus t stil l notif y th e NR C annually , an da t suc htime s a s ther e are statisticall y

significan t increase s i nth e amount s released . Asid e fro

m th e nee dt o compl y

wit hthes e statutor y requirements , EP A

ha s seriou s doubt s tha t release s resultin g fro m startu pan

dshutdowno f th e reactor s ar e eligibl e fo r th e continuou s releas e exemption . Thes e emissions , althoug h perhap s anticipated , ar e no t continuou s an dd o no t occu r o na regula r schedule . Furthermore , thes e release s d o no t occu r frequently , an dth e reportin g burde n i s no t expecte dt o b e unreasonable . Release s du e t o malfunction s o f th e reactor s o r emissio ncontrol s ar e no t continuous , regula r o r anticipated ; therefore , thes e release s ar e no t eligibl e fo r th e limite dcontinuou s releas e exemption . I f I ca nb e o f any

furthe r assistanc e t o yo uonthi s matter , pleas e d o no t hesitat e t o contac t me . EP A appreciate s Sohio' s cooperatio ni nthi s are a o f mutua l concern . Sincerel y yours ^

— > / ' f, i i 

### Willia m N . Hedeman , Jr . ^ Oirecto r Offic e o fEmergenc

y and Remedia l Respons eP. 4 

# io\(io)pn-s-u^ Q 

# cUe4 ^OHIO l SOHI O CHEMICA L COMPAN Y- F TAM4N0 A »OAO . P C 3C x s ; 3 , J W A- r 

### Apri l 2 , L98 5

Nationa l Respons e Cente r c/ o U . S . Coas t Guar d 210 0 Secon

dSt. , S.W . Roo m 261 1 Washington , D.C . 2059 3 Attn : Dut y

Office r William

N . Hedeman , Jr. , Directo r Offic e o f Emergenc y & Remedia l Respons e Unite dState s Environmenta l Protectio nAgenc y 40 1 M Street , S.W . Washington , D.C . 2046 0 Mr . Kennet hA . Schultz , Chie f Emergenc y

Respons e Stat e o f Ohi o Environmenta l Protectio nAgenc y 36 1 E . BroadStree t Columbus , O H 43216-104 9

RE : Notic e o f Release s an dReques t for Interpretation . Dea r Sirs : Thi s lette r i s writte nonbehal f o f Sohi o Chemica l Company , a wholly-owne d subsidiar y o f The Standar dOi l Compan y (a nOhi o corporation) . Sohi o Chemica l Compan y own s an

doperate s a chemica l manufacturin g facilit y 'located i

nLima , Ohio . I have bee nplan t manage r o f tha t facilit y sinc e November , 1984 . A s a par t o f becomin g familia r wit hth e operation s o f th e plane , I hav

e hadoccasio nto review , among othe r things , a portio no f th e history

o f th e plant' s release s o f material s to th e environment . Thi s wa s don e wit ha vie w to determinin g firs t th e frequency , magnitud e an dcause s o f thos e releases , an dsecon

dwhethe r ther e ar e step s tha t canan dshoul dbe takent o minimiz e suc hreleases , an

dthereb

y hel pto insur e th e safet y

o f our operation . Recen t event s externa l t o Sohi o Chemical , particularl y th e increase d scrutin y o f chemica l operation s i nthe wak e o f th e Bhopa l tragedy , have caused me t o b e concerne dabou t the interpretatio no f th e notic e requirement s o f Sectio n103(a ) o f th e Comprehensiv e Environmenta l Response , Compensatio nan d Liabilit y

Act . Th e purpos e o f thi s lette r i s t o obtai nsom e clarificatio no f ho w thos e requirement s ma y relat e to atmospheri c emission s o f hazardou s substance s fro

m a particula r ven t stac k a t ou r plan t whic hha s a permi t unde r the Stat e Implementatio nPlan . Sohi o Chemica l ha s alway s believe dsuchP. 5 Nationa l Respons e Cente r " ?a? a an d Willia m N . Hedeman , Jr. , Directo r

emission s ar e "federall y permitte d releases " no t subjec t to th e notification requirements . However , pres s account s o f action s i nregardt

o th e Union Carbid e facilit y

i nInstitute , Wes t Virgini a sugges t tha t our interpretatio n may no longe r be viewe da s correct . To facilitat e answerin g ou r inquiry , an d a s a precautio ninth e even t th

e notificatio nrequirement s ar e no w determine d t o b e applicable , thi s lette r wil l als o serve a s notic e o f releas e pursuan t t o Sectio n10 3 o f CERCLA . The Plan t On e o f th

e chemical s manufacture da t th e Sohi o Chemica l facilit y i nLim a i s acrylonitrile . I nth e acrylonitril e productio nprocess , gaseou s reactant s ar e combine dina reacto r vessel . The gase s fro m tha t reactio nar e passed firs t throug

ha quenc htower , whic hremove s mos t o f th e heavie r organic s an d convert s ammoni a to a sulfate , an dthenthroug

ha nabsorber , whic hremove s mos t o f th

e solubl e organics , including acetonitrile , acrylonitrile , an d hydroge ncyanide . The resulting cleane dgase s ar e thendischarge dt o th e atmospher e througha stack . Ther e i s a permit , issuedb y Ohi o EP

A pursuan t to th e Stat e Implementatio nPlan , t o operat e th

e tw o reactors , wit hquenc htowe r an dabsorber . I

nth e permi t application , th e quenc htowe r i s identifie das " th e primar y

collectio ndevic e an dth e absorbe r a s th

e secondary

collectio n device . Th e presen t 20 0 foo t stac k i s als o described . The Release s Durin g th

e perio dfro

m January , 198 1 to th e present , th

e annua l averag e o f emission s fro

m th e stac k during routin e operation s ha s include dth e amount s o f hazardou s substance s a s show no nTabl e 1 (attached) . The statement s o f precisio nar e base do na 95 % confidenc e leve l inth e statistica l procedur e for averagin g an dd o no t includ e analytica l imprecision . Thes e average s wer e compute da s a straigh t averag e o f tes t result s (excluding proces s equipmen t malfunctions ) during a give ncalenda r year . Testing o f emission s i s no t don e onan y regula r o r fixedschedule , s o som e year s ha

dmor e test s thanothers . I nadditio nto routin e operatin g emissions , ther e have als o beenduring th e perio dJanuary

198 1 to the present , additiona l emission s a s a resul t o f shutdown s an

dstartup s o f th

e tw o reactors . Safet y consideratio nt

o preven t explosion s have preclude droutin g offgase s throughth e absorbe r during startu p an dshutdown . I t ha s no t bee ntechnicall y feasibl e to measur e th e amount s o f thes e emissions . However , mathematica l modelin g o f the syste m indicate s tha t emission s ar e believe dt o hav e bee ni nth e rang e o f fro

m abou t 24 5 lb . t

o 45 3 lbs . o f acrylonitril e pe r startup , an donthe orde r o f 185 0 lbs . o f acrylonitril e pe r shutdown . Similarly , acetonitril e emission s ar e estimate d to hav e bee nabou t 2 lbs . onstartupan dabou t 32 0 during shutdown , whil e hydroge ncyanid e i s estimate dto hav e bee nrelease di namount s o f 3 0 lbs . during startupan dabou t 80 0 lbs . onshutdown . The reacto r startup s an d shutdown s durin g thi s perio dar e liste di ntable s 2 an d3 respectively . We ar e i nthe proces s o f devisin g change s to operatin g procedure s t o allo w maintenanc e o f safet y whil e significantl y reducing al l startu pemission s an dfo r wha t shoul damoun t to abou t two-third s o f the shutdow ncases .P. 6 Nationa l Respons e Cente r P flg e 3 an d Willia m N . Hederaan , Jr. , Directo r

A thir dcategory

o f release s involve s thos e occasion s wher e ther e hav e bee nmalfunctions, sucha s o f th e absorbe r o

r quenc htower , resulting i na highe r leve l o f emission s thanusual . On e suchoccasio nwa s o nOctobe r 10-11 , 1984 . A

t tha t time , ther e wa s a malfunctio ni nth e absorbe r (whichha dbeen recentl y

revamped ) resultin g i nemissio nrate s measure dat 131 0 to 160 3 lb./hou r ove r a periodo f approximatel y 2 4 hours . Emissio nrate s o f acetonitril e an

dhydroge ncyanid e wer e measure da t 3 to 7 lb./hou r an d30 6 t

o 43 7 lb. / hour , respectively , ove r th e sam e period . Quantificatio no f emission s during thi s 2 4 hour s periodi s difficult , bu t it i s estimate dtha t th e approximat e tota l amount s release dove r thes e tw o calenda r day s were : acrylonitrile : 35,10 0 lb . acetonitrile : 12 0 lb . hydroge ncyanide : 8,98 0 lb . A nearlie r revam

po f th

e absorbe r als o resulte dina highe r leve l o f emission s tha

nusua l o

nAugus t 16-18 , 1984 . Acrylonitril e emission s rat e measure d17 9 lb./hou r to 84 3 lb./hou r ove r a periodles s than7 2 hours . Hydroge ncyanid e emissio nrat e rangedfro m 13 6 lb./hou r to 28 1 lb./hou r an d acetonitril e emissio nrat e wa s measure dat 2 lb./hou r ove r th e sam e period . I t i s estimate dtha t th e approximat e tota l amount s release dove r thes e thre e calenda r day s were :

acrylonitril e 32,40 0 lb . acetonitril e 15 0 lb . hydroge ncyanid e 16,80 0 lb . Sohi o Chemica l Company' s Interpretatio n Al l o f th

e emission s describe dabove have occurre dthroug ha stac k whic h i s permitte db

y th e Ohi o EPA . Tha t permi t i s basedo na napplicatio nwhic h shows th

e quenc htowe r an

dth e absorbe r a s pollutio ncontro l devices , an do n informatio nwhic hindicate s tha t acetonitrile , acrylonitril e an dhydroge n cyanid e ar e among th e pollutant s to be controlled . Sinc e th e permi t wa s issuedpursuan t to regulation s whic har e par t o f th e federall y

approve dStat e Implementatio nPlan , th e emission s fro

m th e stac k ar e "subjec t t o a permit" . unde r a

napprove dSIP . Therefore , a s Sohi o Chemica l Compan y read s the statute , al l o f th e above-describe demission s constitut e "federall y permitte d releases, " a s define di nSectio n101(10 ) (H ) o f CERCLA , eve nthoug hth e permi t doe s no t contai nnumerica l limitations . Further , eve ni f th e release s wer e no t "federall y permitted, " the

y ar e o f th e typ e tha t woul dotherwis e qualif y a s "continuous " releases , subjec t to Sectio n103(f ) (2 ) o f CERCLA . Reques t fo r Interpretatio n Sohi o Chemical' s interpretatio nha s seeme da workable , sensibl e an d efficien t wa y

t o appl y

th e notic e requirement s o f CERCLA . The federa l governmen t woul dno t nee dt o b e inundate db y call s abou t atmospheri c release s alread y regulate dunde r th e ai r pollutio ncontro l laws , th e agencie s regulatin g thos e release s coul deasil y determin e whethe r an y respons e wa sP. 7

Nationa l Respons e Cente r ?a ,. . an d Willia m N . Hedeman , Jr. , Directo r require d(whic hi t wasn't) , an dth e resource s o f th e Nationa l Respons e Cente r coul db e save dfo r trul y significan t release s requirin g response . However , i t ha s bee nreporte dtha t EP A i s considerin g seekin g sanctions , apparentl y

unde r CERCLA , fo r smal l atmospheri c release s a t th e Unio nCarbid e Institut e plant . Thi s suggest s t o u s tha t EP A i s usin g a somewha t narrowe r definitio no f "federall y permitte drelease " tha nth e on e use db y Sohi o Chemica l and , w e suspect , mos t o f th e res t o f industry . T o provid e som e certaint y

o f application , an davoi dimpairin g th e efficien t functionin g o f th e Nationa l Respons e Center , Sohi o Chemica l respectfull y request s complet e response s t o th e followin g questions : 1 . I nth e opinio no f EP A an dth e Nationa l Respons e Center , ar e operatin g emissions , startu pan dshutdow nemissions , an demission s durin g malfunction s fro m th e acrylonitril e ven t stac k a t Sohi o Chemica l Company' s Lim a facilit y "federall y

permitte dreleases, " a s define di nSectio n101(10 ) o f CERCLA ? 2 . I f an y

o f thos e emission s ar e deeme dno t t o b e "federall y permitte d releases, " the ni nth e opinio no f EP A an dth e Nationa l Respons e Center , d o thos e emission s qualif y fo r "continuou s release " notification , pursuan t t o Sectio n103(f)(2 ) o f CERCLA ? Pleas e direc t you r respons e t o th e undersigne da t P . 0 . Bo x628 , Lima , Ohi o 45802 . An y

question s abou t thi s matte r ma y b e directe dt o m e o r t o Hug h Blythe , phon e (419 ) 226-1297 . Than k yo ufo r you r promp t attentio nt o thi s matter , whic hi s o f importanc e t o Sohi o Chemica l Company , an dt o industr y i ngeneral . Sincerely , SOHI O CHEMICA L COMPAN Y

/Joh nW . Hougland , ' ' / Plan t Manage r 1 1Tabl e 1

ANNUA L AVERAO

E EMISSIONS

Acrylonitril e IIC N ' ' Acetonltril e

Yea r 198 1 198 2 198 3 198 4 1 Q 198 5 Ibs./hr

8 

### 21 1 1 1 8 6 95 % Confidenc e Rang e 0-2 5 0-9 5 0-6 3 0-5 4 0-1 3 

### lb :

s . /day 19 2 

### 50 4 

### 26 4 43 2 14 4 l

b s./lir . 3 5 

### 3 5 

### 6 7 8 95 % Confidenc e Ran^ e 0-12 9 0-14 4 0-1 3 0-1 7 0-2 7 lbs./d ,

84 0 

### 84 0 

### 14 4 16 8 19 2 ;i y 

### l b s./hr , 7 

### 5 2 3 4 Co 95 %

nfIdenc e Rang e 0-1 7 0-1 0 

### 0- 8 0- 7 0-1 1 lbs./day



### 16 8 12 0 4 8 7 2 9 6P. 9

Tabl e 2 No . 2 Acryl o Reacto r Start-up s

198 1 A . February

6 , 198 1 - "B " reacto r B . Februar y7 , 198 1 - "A " reacto r C . Marc h 31 , 198 1 - "3 " reacto r D . Apri l 1 , 198 1 - "A " reacto r E . Decembe r 15 , 198 1 - "A " reacto r

198 2 A . Februar y12 , 198 2 - "3 " reacto r B . Ma y4 , 198 2 - "A " reacto r C . Jul y10 , 198 2 - "3 " reacto r D . Septembe r 16 , 198 2 - "A " reacto r E . Octobe r 23 , 198 2 - "A" reacto r F . Novembe r 4 , 198 2 - "B " reacto r G . Novembe r 20 , 198 2 - "A " reacto r H . Decembe r 25 , 198 2 - "B " reacto r I . Decembe r 26 , 198 2 - "A" reacto r

198 3 A . February

17 , 198 3 - "B " reacto r B . Marc h11 , 198 3 - "B " reacto r C . Apri l 6 , 198 3 - "A " reacto r D . Ma y

18 , 198 3 - "A " reacto r E . Jul y31 , 198 3 - "B " reacto rP.1 0

No . 2 Acryl o Reacto r Scart-uo s ?ag e 2

F . Augus t 1 , 198 3 - "A " reacto r G . Augus t 2 , 198 3 - "A " reacto r H . Augus t 9 , 198 3 - "A " reacto r I . Augus t 24 , 198 3 - "B " reacto r J . Augus t 25 , 198 3 - "A " reacto r K . Octobe r 12 , 198 3 - "B " reacto r L . Octobe r 13 , 198 3 - "A " reacto r M . Octobe r 15 . 198 3 - "A " reacto r

198 4 A . Januar y24 , 198 4 - "B " reacto r B . Januar y24 , 198 4 - "A " reacto r C . Apri l 12 , 198 4 - "A " reacto r D . Jun e 16 , 198 4 - "B " reacto r E . Jul y26 , 198 4 - "A " reacto r F . Octobe r 7 , 198 4 - "A " reacto r G . Octobe r 10 , 198 4 - "3 " reacto r H . Novembe r 17 , 198 4 - "A " reacto r I . Novembe r 18 , 198 4 - "B " reacto r J . Decembe r 15 , 198 4 - "B " reacto r

198 5 A . Februar y27 , 198 5 - "3 " reacto rP.1 1

Tabl e 3 No. 2 Acryl o Shutdown s

198 1 A . An emergenc yshutdow n o f th e entir e No . 2 uni t occurre d o n Februar y6 , 1981 . B . Aschedule d shutdow n o f th e entir e No . 2 uni t occurre d o n Marc h 22 , 198 1 C . Aschedule d shutdow n o f "A " Reacto r occurre d o n Decembe r 6 , 1981 .

198 2 A . Aschedule d shutdow n o f "B " reacto r occurre d o n Februar y7 , 1982 . B . "A " reacto r wa s shu t down o n Ma y4 , 1982 . C . "B " reacto r wa s shu t dow n o n Jul y9 , 1982 . D . Aschedule d shutdow n o f "A " reacto r occurre d o n Septembe r 12 , 1982 . E . "A" reacto r wa s shu t dow n o n Octobe r 15 , 1982 . F . Aschedule d shutdow n o f "B " reacto r occurre d o n Octobe r 31 , 1982 . G . "A " reacto r wa s shu t dow n o n Novembe r 10 , 1982 . H . A n emergenc yshutdow n o f th e entir e No . 2 Uni t occurre d o n Decembe r 24 , 1982 .

198 3 A . Aschedule d shutdow n o f "B " reacto r occurre d o n Februar y16 , 1983 . B . A schedule dshutdow no f "B " reacto r occurre d o n Marc h 7 , 1983 . C . A schedule dshutdow no f "A " reacto r occurre do n Apri l 5 , 1983 . D . A planne dshutdow

no f "A " reacto r too k plac e o n Ma y15 , 1983 . E . A schedule dshutdow no f th

e entir e uni t occurre d o n Jul y2 3 an d 24 , 1983 . F . "A " reacto r wa s shu t dow nonAugus t 1 , 1983 .P.1 2

No . 2 Acryl o Shutdown s p a g e • ,

G . "A " reacto r wa s shut dow nagai no

nAugus t 2 , 1983 . H . The entir e uni t wa s shu t dow no nAugus t 19 , 1983 . I . A nemergenc y

shutdow

no f th

e entir e uni t occurre da t 040 0 hour s o

n Octobe r 12 , 1983 . j . "A " reacto r wa s shu t dow nagai nonOctobe r 14 , 1983 .

198 4 A . A nemergenc y

shutdow

no f th

e entir e No . 2 uni t occurre da t 212 0 hour s o

n January 23 , 1984 . B . "A " reacto r wa s shut dow na t 160 0 hour s o

nApri l 6 , 1984 . C . "B " reacto r wa s shu t dow na t 093 0 hour s o

nJun e 12 . D . "A " reacto r wa s shut dow na t 240 0 hour s o

nJul y 14 , 1984 . E . A schedule dturnaroun do f th

e No . 2 uni t bega no nSeptembe r 21 , 1934 . F . Th e entir e uni t wa s shu t dow nagai no

nNovembe r 10 , 1984 . G . "3 " reacto r wa s shu t dow na t 200 0 hour s o nDecembe r 12 , 1984 .

198 5 A . "B " reacto r wa s shut dow no nFebruary

27 , 1985 ,