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# OAR Box 1778 Prepped by Ollie Stewart

Document

Number: 

# 201)11-1-3 4 Docket Number: 

# A-90-0 6

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### Wisconsin Eloctnc POWER COMPANY 231 WMiewoon , PC . BO M f0d4 , fWiwaukOA

. W l 5320 , («4 | 221-2M 8 January 11 , 198 9
Mr . Dal e Zieg e Wisconsi nDepartmen t o f Natura l Resource s m - • - i«Q l , \\ t P.O . BO K792 1 1 ••• t :,; . ^ • " , " ' i Madison , W I 5370 7 : , =— = — l Dea r Mr . ziege t RE : AIR'HEATE RREPAI R- POR T WASHINGTON UNI T 1 Wisconsi nelectri c 1 s proposin gt o repai r th e plat e typ e ai r heate r at Por t Washingto nUni t 1 b

y replacin gth e hea t transfe r surfac e element s Insid e th e ai r heate r enclosure . Th e company believe s tha t th e propose dwor ki s such , a s 1 s routinel y

performe donutilit y

an dlarg e Industria l boiler s equippe dwit hdirec t hea t transfe r ai r heaters . However , du e t o th e Interes t o f variou s regulatory agenda s inth e Por t Washingto nplant , w e wis ht o infor

m th e Departmen t i nadvanc e an dreques t it s concurrenc e 1n th e company' s determinatio ntha t th e wor kdoe s no t trigge r applicabilit y o f th a Preventio no f Significan t Determinatio n(PDS ) o r th e Ne w Sourc e Performanc e Standard s (NSPS ) programs . Th e wnrkthprnmpany

1 s proposin ginvolve s th e replacemen t o f th e interna l hea t transfe r element s (plates ) withi nth e Uni t 1 ai r heater . Th e repai r i s necessar y

%b hal t th e continuin gdecreas e 1 nth e capabilit y o f Uni t 1 du e t o corrosio nInducedai r leakag e i nth e ai r heater . Sinc e th e ai r heater' s plate s consis t o f 1 2 gaug e shee t meta l panel s 2 5 fee t highan d5 fee t deep , space d5/ 8 Inc hapart , i t 1 s extremel y difficul t t o repai r corrosio ndamag e onal l bu t th e lowes t 2 t o 3 fee t o f eac hplate . Consequently , repai r wil l consis t o f plat e elemen t replacement . Th e boiler s 1nth e firs t fou r unit s at Por t Washingto nwer e fabricate db y Combustio nEngineering , Inc . an duse ddirec t hea t transfe r el r heaters . Combustio nEngineering' s ai r heate r desig nuse dshee t meta l plate s t o form th e hea t transfe r surfac e whil e th e othe r majo r boile r manufacturer s the n an dnow us e tube s a s the hea t transfe r surfac e i nthei r ai r heaters . Bot h plat e an dtub e ai r heater s ar e simila r i noperatio nan dexperienc e th e same typ e o f flu e ga s corrosio ndeterioration . Repai r o f direc t hea t transfe r ai r heater s 1 s a commonplac e occurenc e at utilit y boilers . Attache di s a lis t identifyin gat leas t 4 0 generatin gunit s wher s repair$ # vi a replacement , o f significan t portion ? o f th e ai r heate r hav e beendone .EL4
_

Mr . Oal a Zleg a Januar y 11 , 198 9 Pag e 2 Th e company

believe s tha t tha ai r heate r plat e replacemen t 1 t propose s fall s withi nth e categor y

o f routin e repai r o r replacemen t and , thus , shoul dno t constitut e a modificatio nt o Uni t 1 triggerin gPS Dand/o r NSPS . Pleas e le t u» knur t ; r yo uconcu r i nth e company' s determination . I f yo uhav e an

y question s concernin gth e propose dwor ko r nee dadditiona l information , w t wil l mee t wit hyo uat you r earlies t convenienc e sinc e th e company i s anxiious t o initiat e th e work . Th e company i s als o attemptin g t o mee t wit hMr . SchulU , EP A Regio nv , t o discus s thi s projec t wit hhim . Sincerely ,

Mar kP . Steinber g Superintendent! - A1 r Qualit y Environmenta l Departmen t ka b cc ; Da nDash o - PSCW Davi dScmjlt z - EPA

Regio nV Attachmen tP. 5

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