ML19221A002
| ML19221A002 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/18/1969 |
| From: | Dromerick A US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Boyd R US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 7905160478 | |
| Download: ML19221A002 (11) | |
Text
.
JUN 18 ES3 Roger S. Soyd, Assistant Director for Reactor Projects, ;aL U.AU : Saul Levine, Aniatant Director for Reactor Technology, DAL METROFGLITA.'i EDISGN CO. & JERSEY CENT 2AL PCWER ' IGHT CO.
WREE MILE ISIAND.'aJCLEAP. STATICN, UNIT 2 - DCC) 50, 50-320 -
REVISICU TO S3L'C" URAL REPORT FCR ACM Enclosed are revised sections on the prestressing systc=a and structural surveillance for substitution in the structural review report on the above project.
A. W. Drecerick Containment & Component Technology Branch RT-469A Division of Reactor Licensing DRL: C&C3:EGA cc:
R. Tedesco R. Pc ell A. Gluck= ann Distributicn:
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aeading van C&CT3 Reading Al.D RT Reading E. G. Arndt 120 107 k ;w) S!7 cmcz >
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JUN 18 E63 I"GH MILZ IST.AD "IT F.
2 S'C1'.~?. ! LLWCR Greutin; of the stranded tendons with a cement grout has been proposed by the applicant.
In the United States to date, bonded tendons with cement 3 rout have been used only once in a containment structure. The containment for the H. 3. Robinsen facility used grouted vertical prestressed steel rocs.
The applicant, recognising a lack of existing data on grouting of large capacity (appronisately 2000 kips) tendons, has conducted a three phase progras of testing. Phaae I investigated whether nor=al grouting procedures could be effective, Phase II tested the ef fectiveness of special grouting procedures that were developed when found to be necessary, and Phsse III checked the reproducibility of the results obtained with the special procedures.
Horizontal and draped (around a simulated opening) tendons were test greuted.
One of the reasons for cenducting these tests was an opinion among r.any struc-tural engineers that successful grouting of stranded tendons vould prove to be =uch more difficult than for individual parallel wire tendons. The test program showed good grouting results, in spite of some difficulties enccuntered with the grouting system during part of the Phase III program. We have con-cluded that a tendon systsm can be grouted in an acceptable manner if properly qualified procedures are e= ployed.
It is our positien that any tendon system, whether grouted or greased, should be capable of being subjected to periodic inspection to monitor its continued performance capability. If one nethod of tendon protection can be conclusively shown to be markedly superior to another, then a less rigorcus surveillance program would be acceptable.
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~te applicant das tut considar tha ;crie, die in-service surve111sr.ce of the contalacent tenden system is necesst.ry, but has nevertheless pres,ented tr.::
fc11;vi:6 FroGesu. A test pressure Of @ psig (11% af design ;ressure) vill be s'plie.i at f,10 ani 20 years after start of cctssercial operati:n af ttu
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- nt. 71:usi in.apection of cracr.s eni displace = cat m:casure=r.nts vith di gaugas and tiecdalitas vill be used to evainate the pressure effects. De applicant anticipates that the total daflecticas will be small, that the significance of differences in these snail deflections vi'1 be difficult to evaluate, sai that only a gross 11tference in the stracturu, :uch as a large loss of prestruss forea, voul.1 be sp;arent from the emasmets.
De use of a creuted tenica system has, in itself, several desirable features.
Se use of a ec:nent grout aut Mi=11y providas acame be:xiln; af the tenica to the structure with resulta=t tscreacs in the s:stgin of safety in structurcl strength, sines *.bero is scue bactup assista,cs fer the anchersgo assembly.
This also tenis to reduce the cyclic 1cciing nriaticn affects on the s.nebersges ani assists in the control cf structural concrete cract pattarns. ? ~ m*cally, there are s;;4 rent eivsnta6es for the evner throc6b the use of a less expensive duct tiller anterial ami in n2t b*iL6 subjected to tbs avi>= of futurn tenian surveillsace. We considst the degr9e of cerrosion protectica provided by a well grouted system to be estivale=t to that provided by a vall grsssed systen, al+%P 12>, degree of insptet2M11ty to check the tenicus is ekvicusly not equivslant, te are w.J vith the fact thst hanireds of teniens, sacusting to several limmar miles, vill have to be very effsetively Sreuted in the fial.1 under scheduliz6 and ee#1 sai locati n comiitious which may differ significcutly from those used in Las sus I236rv.a.
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JUN 18 USS Three Mile Island - Unit No. 2 3
Studies have been sede of prestressed tendon failures (both peuted and ungrcuted) which shev ttat failures have occurred due to errers in place =ent, inadvertent inclusion of corrosive eletzents, and the presence of an unsncvs corrosion nschani.im.
Cn the basis of our review, inclu.iing the resdta of the test propan, ve still question whether cement grout vill provide a ccrresics protection envircement sufficiently sup3rier to a greased environ =ent to varrant the loss of the inspectabuity inherent in the greased system. We hcve eencluded that grouting vill be acceptable only if a riscreus surveillance systen is pavidei.
In our opinion the surveluance systen proposed by the applicent vould shev only whether the stracture could function as designed, er had failed. There should be a capability to detect structural deterieratics, if such should take place, rather than norely being notified that the structure, e sc=e jo1=0 in tine since the previous test, had lost the ability to withs+M the test ami design loads. We consider that an acceptable surveillance progran should utiliza penently installed instramentatior. to detect stractural detericratica ani verify the continued dssign capability of the tendons during the life of the structure. On this point, ve have been unahla to ccm to as cgreement with the applicant.
In our opinion, instra:nents, such as acoustical strain gcuges or radio fregaency cavity 3r.uSea, capable of perferaing satisfactcrily over the life span of the structure, are av@hla. Periodic m uitcrin6 of such instm=ents embedded emet.
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vell into the concrete structuz-> wuld indicate deviations in s+eacturt.1 strains and changes in the levels of ; estress. If corrcsion nachanisms vere ;rssent and active the instz asentation vould ah=v decreases in st:: actural capability before a point vould be reached at which the coste.1:=ent cculd no longer withstand the design ani test loads.
At Wylfa, the PCH7 vt.1 inst 2sented by osans of E26 Davall/M:C accus*.ical ribrating vire strain gauges placed in the s*cacture with duplicate gauges withh 12 inches of each other. At Chiron 3, st. laurent 1 t. 2, ani swey 1 acoustical strain gauges vere sinn uly e= ployed. ':te histcry of these genges
$n das inspections has demonstrated their 1cng life esi isiependence from tesperature variations asi variations in the insulation of connecting leads.
Other c:ethods of =cnitoring the structure could also be accepted if tanden deterioration ceuld be detected duri:s the life of the stz-acture asi before a critical point in the structural strength were reached.
Ws, ve feel that, with proper survuillance to monitor the r.aintn4mnace of structural integrity, a groutad system vould be acceptable a d vs intesi to continue cur discussion with the arMt on this unresolved item asi vill report our progress to the Cccaittes at the Aly :sesting.
TZ.?! D G For tha initial proef test, we coccur in the 11 % overpressurization with defor=c-tion ani crach observations asi st%. geuse readings. We are discussing vith the applicent the criteria to which the structural testing vill be conducted and svalusted. 'Ibe applicant will develop speci'ic criteria which vill estak'_"ch l
l thdragoeptabic_.prestrehs. lavel aM Oey..vilLbe.; resented. for! ctw.Jeviev...am1_ap; naval _.
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sel?cU OfSt09 f!O*3 t'c f7ur syster t> 0V sve tin.'er CCnsider3tiOft.
De feur syste:S pre-osed v t e a--lic.mts do net 1 clude t " n " ' ' '.
systas, s-ich is t :e only ~ ire tendon sys ten to date
- icn tas receivri final staff approval fer use in 2 cen:al:=ent s t ru cture.
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receint of t' o ?ussellville :.d rancSo ~ece a.-nlicatic-s, ' ici f: rr. t prc: esed use of a ncn-BBP.V syste:., a revies of the nrinci-n1 prestress tenden systens was initiated. B e treroced systecs were su'sequently drop; cd by a r.endment to the ap911catiens and t e centainm-nt structures h
ap, roved wit 3 the us e o f WV ten lon s ys tens.
As ti e er- !!ted. we centinued our evaluaticn of other tr es of systems on the '.iasis of informatien contair.ed ir aarlications and c-tained i,for nllv f:- a v n d r r.
2
?ur evaluation eculd, however, enly preceed to a ce-tain dents since the infermatior. in formal - ' lications wa.s sissvs of a -relisi,arv nature, and the venders indicated t' Tat needed details, such as cc-onant stress analyses and rasults of full-sesla rcof tests, conid 'niv e s'r-liad n a! tat a contract asard.
In our review cf the T"I 8: ap,lication, we have td it e ene fi t of our revious evaluation..crk a d :ve feel that suffici=nt dats Swe ae -
revie-ed to be e.le to a;;r-c in ri.cimle to tmc use of ar > : f t e fcur systens pre osed.
he applicants have been infc n e.~
that furt S e r. i n - d e-t'-
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ffi 13 1963 info::stie-aill r+:ui rnd f: r evalue'.i. n o f e vstc~ C-'!1>
'ciccted and t?.it -mt-cer s tructicn v r ai t 2 rev21
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rier to i.sta11ation vill ;c a.dstor.
De follcwin,c discusato, i g. li t-ts t"e cri':c! 11 d ' 'icr: ne ss t' c systems ar.d materials ~ro osed from t'r u.sua!
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= tic.'. '.a5 'cen t,e crevi ws s t and.O rd s y t t ?'::,
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- ey are accerta'-le di fferences.
" et.til c ss k een s+-i t t e J use cr. PI ?!, Russellville, 3-d 'ancho See: a -! ror* 9t. " rain-I.ar e ca-aci ty 7.r.V tendens have "revious! ' ae, revie<ed an arpreved for use en Nssellville, with detailed iaferation promised i-v the a,plicants after vendar 1olection.
" a c'o 2ee,
? ur.n ler.c nt il was sisitsr! r reviewed contin 2er.t ir o - tk 4 sna lata recuests heir fulfille l.
Be use of Israe si:e t e-der.3 in
-'I is accentahle i- -rincipal and su':stan*istir-Bfen.* ice ill a
'ncluded as art of the detalle! n terial to e se -i tt ad ' -
the selected vendcr.
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JUN 181959 2.
T:e t._ ndons rcros :3 are <t re s t rands rat ter ts:tn ti;n i-divi u'.
sures.
ne:o deco intenis to u e ei
strn-? rr in.; 'ti o n a l ;--
tencens and is th,' cr.ly crier restree::d -lant,
- c date, ic" is not cecuitt:d to a vire tendon,.! S t e exce-tion af ".
cdinsen.
S trands uve been reviewed on 'ane.o Feco Su-"lcrent 'I m t'
i r 1: a in tce T*'I ': desic.n is acceatable to ut.
3.
til four anc.5 crate systens nreaosed are friction or frictienf carie-anchorates, as crposed to the bearing anchorare installed to -lata (3 3?Y). Even though no final arnreval has yet been given #cr tLeir use in nuclear centair ents, they are all extensively used throurient tho general c:nstructicn field.
Th e s ys t e,5 're,csed are-Stress Steci
': ster co n c re',
'!anuf a cturer Frev sinet (Er?"E)
"ST. Cer-Etructurns
'esi; nation Nire strand Vire strand Mi re S trard.
.i re r.trar !
J1tisate Capacity 1344 ki,ns 2004 kips 1S1 *is
?^^' eins Desig, Capacity 1166 ki's 1214 '<ips 761 '- i s 1:30'is End Anencrage er end, male
- Swanced, F" lit c,ne
~-lit enr.e rulti,lo strand t5readed individual indivt 'ual fluted cene collar a-?
't ra-d ri -
ctrar: ri -er riprer s carin g ruk er, 5carine ienri c in -
inte female into conical e--ies' fluted conical
'cles ac'ined eles sole i
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ac' inc.
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The use of friction anchorages bri ;s up t4e r 12tive 'uctility of
. i nific1nce Of ved-e cri-
- earing or wed-e-gripred tendens.
systems resultin~ in a ductility of less than :", w?il' strair' t 5-
') caring syste:s generally 'aave areater than 4*,
elencati9a, must viewed in relation to the actual available ductility in the overall structure. Tests made 5-Frick en curved 121 wire tendens with % e ari n -
anchorstes sho.ed an elon stien of less than 3' while for strai-ht tendens results were greater than 41.
Even a l* clonettien of the Three "ile L' nit 12 157 vartical cylinder walls wculd result in a 1-1/2 foot increase in height, an order of marmitude inrrer than anticipated. Based en the applicants' arcraisal of anticinatad de flections under 115% nrcof test, as su=rari:ed on -cre <^-C-5 of Supplement No. 6, we feel that t'e relatively lower ductility available ed*e anc'or sys t e-c.
with wedge anchors sheitd not areclude the use e:
e In addition, if one accepts the applicant's rrerosal for treutin-of t' e t endons, then the ce=parative importance of the tenden anchornee syster is reduced, tnereby tending to allay intuitive mis?ivings a' cut frictice inchorage syste95. However, the acplicants are disigninc
?' e anchorste syste=3 to withstand at least the tendon's guaranteed ultimate strength -
and conducting full scale croof tests - therebv not takint arv anchernae cred; for the ;rcuted tenden.
4 The ap,licants have srecified that tSa naterial fer the te, den wires be either stress relieved wire er stress relieved an{ stabili:ed virn.
Stabilized wire has not yet Seen officially incor crated into the 1STM
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q JUN 13 <5:0-standards.
In other res ects, t':e wira s t a ll con fo rm t o ' ' J 1'.
?necifications for Enccated Seven 'iire Stress 'clieved stra"! for Prestressed Concret e, with mini un ulti ate stren:t, e# 2c',"'
't i and the seven < ire strand sh all also cen fer-' t o iT*.'- :1f, ' i S aini ta ultimate strent.t' o f 277.nN' ?si.
A review of Anaendix SK to the ?S'1 - a discussien on relaxation losses
' y Shurack
?, As:ociates, and nrevious centact an ' discussion ith CFCI on their LCX-Stress (stabili:ed) strand Tas led us tc t' e conclusion that either stress relieved or strass relieved and stabili:cd strand can 'e used for the T::I !? containrent structure nresticss o
system. Predicted losses in the 85 F range are IP for stresst relieved and 4% for stabilized. The :'e-ree ^f,redi ctabi li ty ar?
conservatism in the stabili:ed strand relaxation estimato is at least equivalent to that for stress relieved stra-J.
It is cur c'nclu '
n, therefore, that, if tha same design censervatis will
's u s e.' fo r stabilized strand as for stress relieved, that t'a use of either strand is accep tab le.
"creover, stabilized strand is tein used st cert ?t- "rai-i and abroad.
In sumnarv, the prestressing systens entiered a5cva share certain characteristics. Principally, the tenden itself is stranded i-each case, and v.eets the same aaterial and strength s ecif! cations. Threa of the anchcraga as s enH lies sre friction medpc tv es. w'!Ie t'e f urt' is a friction /bearine asser51y. He have a reed ir ri nci-le t.'
t'" '-
use and will review the finally selected systen in.icnth te v ri ^-
that it will provide the required safety -arrin, It is avident
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- muir :d star.dards, m.
that, if t. c system cant.ot meet
.'1 ava an acce -ttt' le suF stit ite that cannot le 7.cli fied ta do so,
":c arnlieri. t* '.ve been TJ"icc!,'
to e rrovided '-v t'*e amnlicants.
CUT POSitiCn-m o
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