ML19206A871

Requests Exemption from Provisions of 10CFR50.10(b) to Permit Pouring of Concrete for Tendon Access Gallery for TMI-2 Prior to Issuance of CP

ML19206A871
Person / Time
Site:	Crane
Issue date:	06/24/1969
From:	Price H US ATOMIC ENERGY COMMISSION (AEC)
To:	Johnson, Ramey J, Seaborg G NRC COMMISSION (OCM)
References
NUDOCS 7904210561
Download: ML19206A871 (2)

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Ejuns w Chair an Seaborg Co=nissioner Raney Coc:=issioner Johnsen Co==!esicner Costagliola Co= issioner ho:pson REQUEST FOR E:ESTION 3Y MET'OPCLITX; EDISCN COMP!&f XD JERSEY CE';T"AL PO'.iER & LIGHT C0Y?X;Y FOR Ti TH?lE MILE ISLAND NUCLEAR STA!!CN C;IT 2, DOCKET NO.30-320

Lt opolitan Edison Cc:pany and Jersey Central Poter & Light Cc:pany, co-owners, have filed an application for licenses to censtruct an'.

operate the Three !!ile Island Nucica: Station Unit 2 at the site en Three Mile Island located approximately eleven miles scutheast of Harrisburg, Pennsylvania.

The propcsed Unit 2, a pressuriced water nucleac reactor, is designed to operate at a core pcuer level of 2452 segawatts.

In a letter dated May 1, 1969, Metropolitan Edison Cc:pany and Jersey Central ?cwer & Light Cenpany recuested an exception fren the previ-sions of 10 CFR 30.10(b) to permit pcuring of concrete for the tenden accets gallery for Unit 2 prior to the issuance of a constructicn permit.

The tendon access gallery installation is required in order to pe = it the applicants to proceed *;ith certain cther pre-censtruction work which is per=itted by 10 CFR Part 30, 30.10(b), such as pourin; a concrete seal rat to provide a working surface and protect expcsed bedrock against weatherin; at the betten of the reactor building excavatica, and permit placement of reiviforcing bars for the reactor building base slab.

Tne reinforcing bars will not be attached or affixed in any permanent way to the walls er the ficors of the excavation.

Cur review of the exenption request indicates the tendon access galle r does not serve as a structural foundatien. Geological 1;., there are no unusual foundation problems at the site, and installing the tenden access galler:; wculd b.et present a safety probica.

i'e have revic.ce?

the adequacy of the cuality assurance prc;ran' for construction of the

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Cc=nissioners.

tenden access gallery regarding design, applicable codes, concrete specifications and construction. We have also considered the appli-cants' quality assurance organicatien acd conclude it is adequate to assure that the above quality assurance features are carried out throughout construe:1on of the tenden access gallery. Our review of the exenption request was based on the applicants' providing sufficient supporting informatica to meet the five criteria stated in the proposed Section 50.12(b'), dated February 19, 1969.

The applicants provided additional infor=ation on May 22, 1969 regarding the public need for power generation frca the plant in 1973. Based on our review cf this 'nformation, we have concluded that there is a need for the energy to be produced by the prepcsed power reactor on the schedule projected by the applicants.

An infornation report concaining our safety evaluation of the pro-posed exe=ption request vas provided for the Advisory Cc=nittee en Reactor Safeguards.

T v~ 1 a liSe to discuss _this at an early _ Info"-'ti^n Me*ti"?-

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.i Ha.old L. Price Director of Regulation Attach ents:

1.

Metropolitan Edisen Company and Jersey Central Power & Light Company it: dated 5/1/69 2.

Proposed ltr authoricing exe ption 3.

Metropolitan Edison Company and Jersey Central Pcwer & Light Cc=pany ler dated 5/22/69 cc w/att:

General Manager (2)

General Counsel Secretary (2)

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Jersey Ct atral Power & Ligl Company M ACISCN AVENU E AT PUNCH OCwL "t O A D o MOR AiSTCWN. N.J. 373C 0 533 6 t ! t

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5.1.3 CORROSIC.N PROTICTIO::

3.1.8.1 Multiole Earrier The contain=cnt structure, liner and reinforcing bars and tendens, are protected against external corresive influences by the folleuing reans:

a.

The provisica of a drained access gallery at the bot:cm anchorages of the vertical tendens and a retaining vall frca foundatica icvel to grade forming a drained meat around the belcw grade part of the containment shell.

b.

The waterproofing of that part of the building foundatica encicsing the access gallery with a 40-mil-thick, polyvinyl chloride sheet m c=b r an a. The ec=branc vill cover the underside of the outer 25-foot annulus of the building fcundation and vill be mcda ccatinucus, with nc branc of the sc a material covering the outside face of :he foundatien and the retaining v211.

I c.

The liner ufil be additionally prc ceted frca the exterior by a

=ininum of 4 feet of concrete for that por:icn of vall below l4 grade end the thickness of the mat,-appr:ximately 10 feet, a:

i the bottom.

d.

The tenden ducts vill have a mininua clear ccvar of concrete of 6 inches whereas 1-1/2 inchas is recuired by code. See Table 5-2.

The tendon ducts, being spirci cound 22-gau;c s:eci, ' rill pro-c.

vide a greater de;rce of va:cr-tightness than tt.e conventiencl flexible ectal shecthir.g.

f.

The access gcllerv vill pernit deferral of shipnent and ins:alla-tion of all tendons until :ha entire structure is conctructed.

Thus, the tendon ins:alla:ica can be performed in.a continuou:

operatien with the minimun possible c::posure of the tendcas in the field.

i I

g.

The void space between the duct and the tensioned and anchered tendon till be cerple:cly filled *aith portland cement greut.

5.1.8.2 Crouted Tendens The com Ictely satisfactorv. corresica protectica for steel af forded by the alka-r lif.e eneircntent of portinnd cement is a principle upcn ::hich the structural use of reinforced concreta, both conventicual and oretensioned, is based.

A report, The Perf ormanca of ?cs t-Tensioning Tendens as Rafice:cd vy Corro:ica Occurrcaces, 5-11

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..-.----,--....-.,-,.-,<,2 APPE:: DIX 3D QUALITY CC:: TROL

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1 G r. r e_s,

- - s A formal quality assurance organization and reporting syste= vill be employed to assure that cri:ical structures vill be built in accordance with the spccifi-cations. The responsibility, coordination, monitoring quality centrcl functions of the cognicant organica:1ons are cutlined and defined in Appendix 13, QUALITY ASSUPJ !CE $'R00PJ.'i.

2 CC::STRUCTIC:' PRACTICES A.' D OUALIn CC::T3CL 2.1 APPLICA3LE CC:'STR"CTIO:' CODES

+

The follouing ' codes vill be used so establish the specifications and procedures governing the constructicn of the Reacter Building:

ACI 301 - Specificatica for Structural Concrete for Buildings ACI 318 - Euildin; Code Require: cats for Reinf orced Concrete ACI 347 - Reccamended Practice for Cencrete Fortuork 4

ACI 605 - Reccreended Practice for Hot Ucather Cencreting ACI 613 - Recc ended Practice'for Selecting Proporticas for Cencrete ACI 614 - Recen: ended Practice for '-:casuring, 'ixing and Placin; Cencrete ACI 315 - Manual of Standard Practice for Detailing Reinforced Concrctc Strue:ures Part CU - Requirc cats for Unfired Pressure "essels Fabricated by Welding of Section VIII cf :hc AS::R Sciler and Pressure Vcssel Code AISC

- Steel Manual, Ccde of Standard Practice PCI

- laspecti n Manual M.'S

- Ccde for Uciding in Buildin; C:nstruction (D 1.0-66)

AUS

- Roccan'nded Practices for Welding Reinforcing Steel, Mc:a1 Inscr:3 and Cetnections in Reinforced Concretc Constructica (D 12.1-61)

WCRSI/

- ?.accemended Practica for Grouting Post-Tensicned Pres:rcssed 9

PCPAC Tenicas u

GE-2'13 5D-1

(?e'eised 'ecccher ?, 196 ?J i

2. '..

CC ".. S *t.."C't'. v "..

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a Materia.'s to be used in the containment structure include concrete, cencrete 2-mate rials, reinfor:ing steel, pres:ressing sys:er catcrials, and s:cel line.r plate.

The user inspectica and testing of each caterial will be'as follows:

2. 3.

1 ac.u:.CT,.C I 0-

.a Im.,.

C.,... C :..

u. iI '.:. a-e

e 2.2.1.1 Cerent The cement used in developing the design mix will ceaform to ASTM Specifica-tien C150 for Type II Cement. The following tests vill be performed on the cement to ascertain c:nformance with this specifica:ica:

ASTM C 109 - Methed of Tes for Ccepressive Streng:S cf Hydraulic Cement Mortars ASTM C 114 "ethods for Chemical Analysis of Hydraulic Cc=en:

ASTM C 115 - Method of Tes: for Finmacss of Portland Cement by the Turbidi=cter ASTM C 151 - Mc heds of Tes fer Autoclave L:pansica of Portland Ceren ASTM C 190 - Mc hed of Tes for Tensile Strength of Hydraulic Centn: ':o r :a r s ASTM C 191

':cched of Test for Time of Setting of Hydraulic Cenent by Vica: ::cedle z

2.2.1.2 Na t c r _P_.e_d u ci n 7u.A r c a t s '

A water reducin; ;cn: *hich conferns to.ST:' Spee: fica:ica Ci91, Type D t:111 be used in devciccin-the design mix.

The k,articulcr additive to bc utilized O

will be de craincd by conductin; cencrc:e stren;th and shrinks;c tests to enrure specifica:i:n requircnants are met.

2.2.1.3

.A.c.a.~r e.c a t e_s c

G The c;;regata uced in develeping the design mix *eill be subjected to the fc 10 -

ang tes:s to eraura :::-licace with spccification rcquircacnts.

c~214 ou

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e Test Results to 3e ASTM "c.

Name Basis for Achievec C 131 Les Angelcs abrasica ASTM Spec C 33 To confer.: with specifica:ica C 142 Clay lumps ASTM Spec C 33' To ecnfor.n eith specificatien C 117 Material finer than ASTM Spec C 33 To conform with No. 200 sieve specifica:1cn C 87 Mortar-making prope: ties ASTM Spec C 33 To ecnform with s p e.;.c.; c a <,.-

C 40

,. Organic ir;urities

. ASTM Spec C 33 To ecnfern with specifica:ica C 2S9 pc e..m.4=.' ?=_..'"..'.;-

u' _e ~4. t.<., a. - C 33

• o c ^..e..rc-....'.'.

i (Chemical) specifica:ica C 135 Sicvc a alysis ASTM Spe: C 33 To ccnform -ith

. p e. < r.i.,. :,. -

C ES Scundness ASTM Spec C 33 To cen crn -ith

. c

.4.c < c _,. :. n

_e C 127 Specific gravity ASTM Spec C 33 Mix design and abscrptien calculatiens C.'. '

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d c o-t.,~.3 s

and abscrr:f:n calculaticas C 295 Pe:rcCrtphic ASTM Spcc C 33 To confern..d:5 specificc: ice 2.4...w

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ASTM Methed of Test for Ccepressive Stren;:S cf Mcided Concrete Cylinders C 39 Methed of Test for Slump of Por: land Cecen: Concre:e C 143 Methed of Making and Curing Concrete Ccnpressien an

• Flexure Tes:

Specimens in the Labcra: cry C 192 Method of Tes: for Air Cen:cn: of Freshly "ixed Cencrete by the Pressure "c:hed C 231 Method of Test for 31eeding of Concrete C 232 Static Young's Modulus of Elasticity and ?cisson's Ratio in Cc:-

pression of Cylindrical Concrete Specimens

.C 469 Eight cylinders vill be cas:

2n each dcsign mix for tuo compressive stren; h tests on cach of the fc11 cuing da'/s:

3, 7, 23 and 90.

The strength, :eorkability, and other charac:eristi:s of the mixes will be as-cer:cined as a part of this progrcn.

2.2.2 P,.sC n L. -,, C,,, u u-. c.,. -- -

- c.i.

a 2.2.2.1 Cencrci The produe:icr. mixes will be :hosc mixes developed frca the design mi:e :esting program (sce Sectica 2.2.1) and elli be proportiened in acccrdance eith Recem-c.

.e cc.3,-

3.. c.... 4.,.. s-e,.

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qualified cad accep:cd for the,Ork During ccas:ructica the field inspe::len p a., 3 c ~.,. c.,.

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..4.,.

.- ~. y., :,

s, _s < : < -. a..,.. <-. u.. c,

...:.. e. g

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..... a b.v veri :ica in ar rc ate radatica and moisture centent.

The productic.' con-

.o e

o crece.. ' ' '. k c -ix. ' -..' "...-..n~ m c.. c. '. <

c c.

t. a.- ~.. ~ c. 4. ~. h. " m,.,.<.= 1 a.:.-.,.

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vith ACI 201. Ihc contair:ca: shell ci:1 be cured in accordanca v:::. f.CI 301 e v. e c, -

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=ain taining a con' inucusly ve: covering; use of curin; cc peunds will be prc-hibited.

i 2.2.2.2 Ce -

- _m. nt The ce:ca: for the productica al:< vill bc the ene selected in~ the design mix testin; pregram (para. 2.2.1.1).

In additica, :he production eccent will be pe ric3 f ca' 1;. retes:cd in acecrdence eith 'tSTM C191 and ASTF ClO9 to ensurc that s: Orc;c rn.iro.ncnr cffeCOs hTVc Co*. Caused de:criCr2: fen of the CeCCn: Ch:raC-t e ri s t ics. Thesc :cs:s.-111 be supple ec.:cd by visual inspcctica cf the 2 crial stw-s

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~ A. F. orris, 01:c1 ?.17 1,,1922 2.2.2.4 Water and Water Reducine Arents The water for the production mi:. will be of the same quality as the vater used in the design aix testing (para. 2.2.1.4).

The water reducing agent for the production mix will be the one selec:cd in the design mix testing program (para.

2.2.1.2).

2.2.2.5 Quality Centrol, Insecc:icn and Testin2 The procurtment of production concrete will be from a supplier who will be held responsible for the quali:y control of the concre:c including the required tests, inspecticas and records :o confirm that the concrete d ocs in fa:: meet specifica-tion requircaents.

The supplier will be required to obtain the services of an independent testin; laberatory to c:nduct the concrete quali:. centrol and in-spectica program. As indicated in Secti:n Ib on JC?iL's quality Assurance Pro-gram, the concrete supplier's Cuc.11ty Cor. trol Pregram vill be menitored in depth by Burns and Rec's Field Quality Assuranec Surveillance Group, chich mcy include, as required, the services of an inde; cadent testin; laboratory to assure that the cencrete supp11cr is ace:in; the specificatica requircrcnts.

JCPM.and/or its agent vill also ecnduct qu :ll:) assurance audits en the overall quality pro-gram associated trith concrete.

5 A batch-;] ant inspcetor will be providcd, and testing, as sheten bele, eill bc perfn.med.

Field con:rol will bc in accordance with the Manual of Ce ~cte in-spection as reper:ed by ACI Committec 611.

The batch-plant inspector will test all mi.e ingredients periodically and will certify :!.c mixed proper:fons of each batch.

i:e.111 ensure that c ticket is pro-t vided for es:h hn:ch documen:ing the tinc Icaded, actual ni:- praportiens fr.clud-I in; ':ater, ancent of concrc c, concrete design strength, des.igns:ica as te portica I of structurc, a.id identificatice of transit mixcr.

Another inspc:: r(s) at the constructica site will inspect reinforeing and fer.,

l placements.

c';c clumn tes:s, acke tes t cylinders, check air :en: cat, and re-cord weath'cr conditiens.

Con:rcte strength, slump, and tempera:ure inspecticas will be perfen cd.

The purpcse of the tes: and inspe::ica is to escertain cen-formance to specifications.

S ? V a T C, T F.n* f. 7..,.

uG.

aw a.

For the Ecse:cr Buildin, a set of eight cylinders vill 5a nede for each 100 cubi: vards er fraction :S:re:f o.l,ced in anv day Two eviir.dcrs till bc tested at 3 days; e.co :"/linders a:

-s_.

7 days; tuo cylladcrs at 23 days ; and the.rcmainta; e.:o cylf.dcra at 90 days.

In addi:ica, all test cylinders.ull bc.reigacc to ceasure and vcrify the radiatior sh'iciding density ascu m:icn.

f e r _. rp s y, lif.,

41(

SD-4c (SeviccJ Dc:erbe-2, 1900)

=

Concrete cylinders f?r ccepressica :estin; vill be made and s: rip-ped within 24 hcurs af ter cas:ing and marked and stored in a curing,

reca. These cylinders will be made in accordance ti th A ST:: C 31, Method of '!aking and Curing Cencrete Compressica and Flexure Tes t Specimens in the Field.

Cempressive strength tests vill be made in accordance with AST::

l C39, Method of Test for Compressive Strength of Molded Ccacrete i

Cylinders.

l b.

Slump, air centent, and temperature will be taken when cylinders are cast and for each 50 rards of concrete olaced.

I Slump tests *:111 be perfor ed in accordance with AST'. Cl;3, j

Standard Mathed of Tes: for Sleep of Par: land Cc=en: Concrete.

The aliceable slunps will be in ac:ordance tith Tabic 303 (a) of ACI 301 for sla':s and reiafor:cd valls.

Air tcsts vill be performed in accordcuce eith AST': C231, Standard ':ethed of Tes for Alt Centent cf Freshly X.. i Cen-I crete by the Pressurc ':c: hod.

Temperature limits are per ACI 301 requirements for mass :eneretc In the evcat that concre'.c is pcured during f rcering, cather, or the: a free:c is expec cd during the curin~ a-c.ried, an additional cylin/cr ill bc nede fer a

each set and vill be cured unde? the same conditiens as the oar: of the s t ru :-

_tu_re chici, it re, re s ca t s.

s I.

The evaluatica of the tes: result uill be in acccrdan:e with Chaptar 17 of ACI 301.

/

e O

SD-5 (Revisad uccc ' car 2, 103,

62"218 1

9

2.2.3 R.e I v..

C w. e n...., S. re

.o 2.2.3.1 Material Tes*1n' a d #.sr.ct.'.n c' a11.c.dn.' o..'. 3 s o. a..' v. 4. '.' be e..#-..a.d.

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w physical properties of the esterial ill be submitted to the In;incer, Eurns cnd Roc, Inc., for review and app rc"al.

Each bar is branded in the deferrin; process to carry identificatica as :o the manuf acturer, sice, type, and yield strength.

Example:

B 3ethlehem 18

- Sice ISS N..

- New billet stec1 4

- A 615 40,000 psi yiald 6

- A 615 60,000 psi yield Secause of the identifica:ica sys:cm and the lar;c qucntity, the aaterial *.'11]

be kept sepcrated in the fabrica:er's ycrd.

!n addi:ica, wnan Icaded fer mill shipment, c11 bars 111 be preperly separa:cd and ta;;cd.ith :he manufceturcr's identification number.

Inspection of the reinforcing s:cel vill cke place at delivery as ;ic11 as c:

c re c t i c.n.

The cenditien of the.aterial mus t meet cil of the requirencnts of ACI 318-53 as well as env. cddi:1:nal rcqu'rc=ca:s made b.;.

the inrpcotor.

Tne bcrs.till be randomly sempled in the field cad tested to destructica to check specifica:ica ccenlicace.

The frequcacy c! tes:in;. ill be tuo specim'us :c%cn f r e- - c.2. -lt g..,,., e..a. c. 4.,. 5

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u n.a,. i t e. g. n ~.,..,,.,.., -

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3

.v a scric; of tes:s vill b2 anda for ecch tuenty-five tens cf reinforcin-stcel.

s If test results Go not

.a c t specifica:ica requf rcnan:s or decia:c nerc thcn 10 per cent frn-the mill test results, further tes:inz of that heat of materici and an engineerin; investi;atica will 52 ccacuc:cd.

2. 2. 3. 2 Splices All splices in '.'e s. 145 and 1SS reinforcin3 s:cci vill confor. to the ACI Ccdc requirc cats for.aldad or 2chanical splices as a minimur.

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To ensure the integrity of all splices, the quali:y centrol precedure will be maintained by quali~icatica tes:in; of the individual splicing cre'.s, visual inspection of each completed connectica, and rander sampling and tensile testing of producti:n splices.

For Cadueld spli:es and thermi: veld splices, procedures vill confor: with tha manufceture r's recernenda:icns.

Prior to makin; cn'/ productica splices, each nachanic vill prepara sampic splices fer tensile :csting coverin; each bar size and pesitica to be used in production to qualify.

The sample splicas will be tested te failure and.mus:

=eet the minimum requirement for tensile strength as s:a:cd above.

Each produe:1on-made Cadweld splice till be

• isually inspec:cd to ensurc that sound filler =ctal is present at both cads of :he sleeve and c the tcp hole.

Each velded splice zill be visually inspc::ad for cracks, incdequate si:e and other visible cefects.

In addition to the visual inspection, joints shall be randctly sampled and tensile tested in accordance wi:h the fc11cring schedule for cach positica, har size and 3rade of bar:

4 cut of the first 100 splices l4

'3 out of the acxt 100 splices 2 out of the nex: and subsequent units of 100 splices If any of the scrpled spli:cs fcil to.cet the required mininue tensile stren;;h, a thorcu;h investi;ntion *:111 bq : de to determine the cause and entent of the defective splices before continuin3 with :he production work.

For reinforcin; steel of size ::o. 11 and under, lap splices mill be 7ermit:ed in accord: ace.ith /.CI 313-53, Chaptcr S.

Splices c: points of maximum tens?.lc stres: t.111 be a.olded and alternata splicts.all be sta;;cred.

Rein forcing b.,r. ciding will be perforued in a::ord nee t.i:5 :he Accrican

• 21(d :;

Socict) S t cnda rd A*:5 ' D12.1 :: 2ccer cnded Prac: ices f or '?cidin; R :afo rcin.' 5:2c!,

Metal Inscr:3 :nd Connectica: in Reinforced Ccncre:2 Ccnstructi:n. Ucidin' occ-cedures and.21d':s.ill bc qualified to s.

5 s tandards re fe renced the reir.

Ma:crial purcha sed till be required :: have mill test report s'nalyses of carben, phcsphorus sulf,ur cad acnganese for cach hea: cf material 'nd must also =ce:

the physi:al :es: require :nts of the applicable AST:! specificati:n.

Ran.:n sampling and testin; 'till be made of ma:erials as received to assare that : hey

=cet the nac:1:nical test requirements. All crrpicted ucIds 1: 1 :n in s p e c: 2 6 vi s ue l l,. for cr:cks, ini.d2qua:e siac :nd other visible defects.

There

.-111 be no tach ',1ClOing O[ reinfo:CCrent.

2.2.3.3 fchrfecticn Vi s"s.' <.se~s.'--

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soi 2.2.4.1 P.rcstress Steci High strength strands will be in accordance with ASTM A 416 as a mininun require-High strensth steel tendons with f's higher than 250,0C0 psi and o' lar;cr cent.

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/sGeo H. Ritter, Vice tresilent Strcrn an! Subscrihi'.

before ac this 22nd day cf I'ay,1969

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Docket No. 50-320 Mr. George H. Ritter Vice President Jersey Central Power & Light Cc=pany 260 Cherry Hill Road Parsippany, New Jersey 07054 Mr. J. G. Miller Vice President 5 Chief L ser Metropolitan i son ny

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P. O. Box 542 Reading, Pennsy,alia R

D..ar Sirs:

This is in reply (; ym.. -

equest, dated May 1, 1969, for an exemp-tion frc: the provisi ot 3ectica 50.10(b),10 CFR Part 50 of the Commissien's rule, t a.-suaat r' Saction 50.12 of the rules, to permit the performance of certain

. k at the site of the Three Mile Island Necica: Section Unit 2 trior to issuance of a construc-tion permit by the Cc :is cion.

You state that pouring of concrete fer the tenden access gallery, which vill be located belou the nain centainment rat, mus t be authorized before you can procecd with certain other pre-constructien work such as pouring the cencrete seal ::: to provide a verking sur-face and protect bedrock against weatherin; at the botten of the reactor buildin; encavation and permit place cat of reinforcin; bars for the reactor buildin; base slab. You further state that scheduling of the constructica of the tendca access gsllery is important to permit adherence to your senedule for ec=pletion of the plant.

We have examined the supporting infor:stion centained in your request for an exe ptica and have concluded the granting oi an exc ptica, pursuant to Sectica 50.12 of 10 CFR 50, as requested in your letter of May 1, 1969, is authorized by lau, and trill not endanger life er property cr the cenmon defense and security and is otherwise in the public interest. Accordingly, th2 Cc issisa hereby authorires ycu to construct the tenden access gallery for Unit 2 at the Three t:ile Island Nuclear Station site, as requested in yeup let;er of :ay 1, 1969, prior to the issuance cf a ccnstructica permit.

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EMssrs Fitter and Miller.

I wish to e=phasize that granting of this exe=ption shall have no bearir.g upon the subsequent granting or denial of a construction per=i: for the proposed Three Mile Island Nuclear Station Unit 2, and any verk performed pursuant to this exemp tion shall be per-for:ed entirely at the risk of Metropolitan Edison Co:pany and Jersey Central Power & Light Co pany.

Fur-hermore, the granting of this exemption does not constitute an approval of the type or adequacy of the =ethod of its installation.

Sincerely, Harold L. Price Director of Regulation ec: Gerald Charnoff, Esquire Shaw, Pittran, Po tts,

Trcwbridge & SSdden d

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