In 1989, IAEA initiated a pilot study on the management of aging of nuclear power plant components. The Phase I and II studies of concrete containment are discussed. With the data base, plant owners will be able to review and enhance their existing programs. IAEA will analyze data provided by participating plants and the report is scheduled to be released by late 1994 (final report release mid-1995)

Naus, D.

Pachner, J.

Tai, T. M.

UNT Digital Library

MAR 22 '94 12"32 64722IDGE NATL LAB. #6155740651 P _"'_g, DRAFT&CONCRETE CONTAINMENT AGING STUDYJara Pachner-- International Atomic Energy AgencyTom M. Tat -- Bechtel CorporationDan Naus---Oak Ridge National LaboratoriesORNL Program Manager: D.J. NausWork Performed Under ORNL Contract No. 19X-SD684VPrepared forOAK RIDGE NATIONAL LABORATORYOak Ridge, Tennessee 37831managed byMARTIN MARIETTA ENERGY SYSTEMS, INC.for theU.S. DEPARTMENT OF ENERGYUnder Contract No. DE-AC0$-84OR21400Prepared for theU.S. Nuclear Regulatory CommissionOffice of Nuclear Regulatory ResearchUnder Interagency Agreement No. 1886-8084-5BNRC JCN No. B0845A _TI_.e submitted mnnuKflpt.hu lien authored by n contrnclor of the U.S. Government under contract No. DE.AC05.S4OR21400.ceordlnRiy,me U,S.Governmentrettlns• noaexciulive,royalty-freelicensetopuMiskor reproducethepublishedform of thist_mtrlbutlon,orallowetb4n todo _, for U.S.GovernmentpurpoeeL"MASTEROJSi;_'rtfObl C_ i_H4 _;b_ Vii _J_mL'i_}fTEOCON CONTAINMIT AGINGrUIDYAJNrriL_Cr tcchniques _ ecx:c__ pddeffnmapplicable to nudmtr condom coastDuring normal plant operation, a concrete structures: and to deveiop a set. of renditioncontaimmlat buikkg provides shelter to safety, indicators for the monitoring of -coagfctcrelated componema imide the building a_inst containment alpnI. With the argot tl_ealetml _ In tho event of a post_dagcd database,, plmtt owncm wilt have tim oppomtmity-des/p ba_ _t, the cnntainment serves as a to review and enhance the/r ez/stiq proggaam ifpressure tgmndagyand as a fission product barrier necessary.. The implementation of an cffcct/vcto minimize radioactive releases to the program on the concrete contahtatemt and otheratllnmphere, These mitigative funcUo_ ,ire plant _tructurca will bc useful in assisting theperiodically tested using leak-rate test aL rated control of ever rising O&M cost for a nuclearpressureto ensureleakagesarewithin acceptable power plant. 'This informationwill be compiledllamas, and for a containment _th a non.grouted through a survey wki_ Includes a gcncralprestreued tendon system, by a tendnn description of the plant and a request ofsurveillance program. Recognizing rile historicaldata pertaining to structuralagingandimrmrtance of having an cffc_ive prngram to inspection/repair. [AEA will alzaly_ datamanage aging of plant structures und systern_()n provided by participating plant.'_and the report issafety margin and on the control of 5zture scheduledto _ rclcascOby late 1994,operation and maintenance (O&M) cost, theInternational Atom/c Energy Agency (LAEA) BACKGROUNDinitiated in 1989 a pilot study on the managcmcntof aging of nudear power plant components. Aging of nuctear power plants (NPP) must bePhase [ of this effort was completed in Oetol0er effectively managed to ensure that the requital1992. In addition to the concrete _ntamment plant safety, and rcliabiLily arc maintamcdbuilding, the [AEA studies also addressed the throughout [_]:,nt _ervic_ life, including anyprimarynozzleof me reactnr r)re_ure vessel, t',_e extended life. To facilitate the cxcbalzgc ofmotor.operated i_olation va lye, ,,nd _nformattonand collaboration among internationalinstrumentation and _ntrol _bles inside tn_ organizations. Including utilities,containment.The objecuvesofthepilotstudios urchztcct/cngin_rs,and vendon, the IAEAwere to identily important aging mccl_anisms mid initiated pilot studiesIt] in t989 to develop ato develop a strategy to _ener c_ntrot methodolo_ tu perform aging studiedon the_egradation of systems, structures, and i_nmarynoz;'Jeof the reactorpressurevessel,thecomponents by these aging mecham._rm. Tl_e motor-operated isolation valve, the concretePhase iI studies, which lava}lye marc cxtens.,_ containment building, and instrumentation andagingresearch,wereimplementedthmugl_[AEA's control cablesinsidethe containment.Thc studyCoordmat_ R_,carct_ Program (CRP) _n late _lso identifiedthe following t't_ehnicalLssucs:1992.I. What is the current und_umdinl ofThe objecxives of this CRP arc to prr,_luce a relevant aging phenomena and how aresummaryof current aging management practices the r_earch results and operatingand c.xpcnence for concrete cnntamment cxpenencc being applied to operationalstructures; to compile a state.of-the-art re_ort nn plants.concrete repair tc_nique_ and materials 2. The _tential safety impacts of aging if_petqfimlly applicable to nuclear concrctc aging mechanisms are not properlycontainment structures; to develop crack mapping mitigated.2"73. The effe_ of existingtechniques components(concreteand's_oid)_ai coamJuwntuu6.to Isoatilor and to miUp_ ailing wllJc_UlIbNIe_ isnpmcs_Uzopmtlium_ol thedqpmladm, com'mecoc TbaenSiq;'mzdzmdm4. The¢Bmfmmm of curremprocedure_m ore:predictfuturecomponemperformance.5. The need to develop metdmdsand _teria • concrete shrinlmp cmcktnlto pnMia remaining _rvicc lift of * frcc_,*_aw effectsnuclear .,n_tem, ._tructur_t, and • resak)m with _ a_• aglpmive mmmad attmdB_onconcrete ,i"Pilot stadia wcrc pm_rmcd for _tch _mponcnt * _rlmution of cxmmnt jmnmwith tlze objectives at ldentlDj1n| dominant aging • prolonged exposure to elate4mechanisms and developing a strategy to manage temperaturethe et_ts of asiaI, Thesepilot studiesare hcinC * exccssr_ irradiation by gazlztmzandimp_tod in t_o pha.s_L PhaseZ .',_tivitim, neutronradiationwhich have beta completed, m included a review , corrosion of retorting steelof curt'cat unm_umndlng of, and methtxis nml , ¢OITOSiOnof coataiztme,Jtt sil:_ linermitiption of aging; idcut_cation of relevant * currmion of prmtres,wd tendonsknowledge and technology gaps; and _i * prestressing losses of tendomformulation of _mmcndations for folLuw-.p * fatiguework. • ._cttlementPHAS_ 1 STUDY OF CONCRETE I'IIASE I RESULT OF CONCRETECONT_ CONTAINMENTThe Phase I study of the concrete containment in Based nn the understanding of the idcntillcdidcntLfyingagmg mccbamsms and the mitigati(,n _ging mechanisms and their deteriorating effectsof the effects of these aging mechanisms utiJizcd _bscrvcd, the study compiled a list o[ tcclm_ucsreault-_from omer researchefforr._by TAEA.('l tomomtor the conditionsofvariouscomponcn_EPRI and NUMARC,[`!and Oak Ridge N=_tional _xe_ techniques, used by plants m different[._boratory.I_I _esuits of the Phase [ study in countn_x, are summariz.e.das f_llo_Tc[_eterence 2 summarize the design functions el aconcz'etecontammentand the servicet:(mditic)ns • vLsuainspectionof concrete for cracks,of the structure durmg n_rma| and at_nurmal _paiJing, lea_alkaliae_g_epteoperations. Theseincludeexternal events._uc_a.,; _ rcactlon_rodUcts _ CA AIIt')tornadoes and seismic activities, and internal * instrumcntaided i._Oa for concreteevents such as design basis accidents. "_,c study such as slrain meters and the use ufalso compiled operating experience (_f ultrasonic techniquescontainments and concluded that the performance * _t,'stmcthod_ to dctcrminc the prc_cnccIf of the contammeh"t._as*_een excellent dtlrtrt_ of AAR if ]caching and gel products arc• _ o . *"normal operatmns and permmc pre.qsurc fC.%fS vislbJcaitbou_ none o! thcsc structures have , pressuretest includinll mmmur_menmofex_rie_ a design basis type of dynamic load. ]_res._ure, temperature, humi_ty bothTypical deteriorations identified have t_een minor i_ide and outside the conmtamentcases of concrete cracking, corrnsion i. * visual inspcc[ion/L_ corrosion,cracks,orreinforcingstccLandcxccssivcprcstrcssloss,csm _hemicai attackM"on containumnt liner;,wdrcs ol a prcst_ tendon s.vstcm in a none'rote t:se t_fdye p_netration testing if pressurecontainment. Most, if not all tlzesedeteriorations test iitdicatc_ C_cC_ivc leakageshave hccn antncipated in the dc'.-'signand were • l_boratory examination of cut-out samplesmitigated by usin_ a conservatn,'e design _ar_in. from ._tccl linerNonetheless, the report summarized all :_gmg • visual and acoustic inspection and checkmechanisms (hat muld degrade the structural tar cracks in (he liner syxtcm• visual mspe_on, including chedcing • state-of-the-art repair techMqucs on_m"_ chad_g eonerctc corn:treeandother cont_mme_mlm_mluadm'andux for t_ar;": failure,checking compoaeaucables_eam_ for corrosion, checking . crockmapping and acx:eptam_criteria forgrease in tendon duds repair including a correlatimt of crack• me,uurr.mcm of tendon tensions, categoryIo repair mellto_cheddng of tendons tar relaxation against • coNllion indicatoll and _ fordesignvalm monitoring the aging of com:xete• visual inspection for gross building conmmmentsettlemeat• monitor building settlement by PIIASI_ U STUDYins_tatiom• chectr_g of bu£1din_ expansion _n0 ,'_'xePhase 1I study of the coucre_ conlammemzdeformation during pressure tats against tzas been implemented by the Coor0tnatedallowable design values Researcll Programme (_d') _pomo_ by tt_¢• _sual inspemon for leaks, cracks, tile IAEA. Organizations panicipa_g ia this effortpttysical conditions and freedom of include utilities, regulators, resea_ lammwries.operation of bellows, and insulation and _nd architect engineers from the United Statm,seals of containment penetrat|ons Canada, the United _ngdom, Ind/a, France. the• te-_ting of containment penetrations _y Czech Republic, Switzerland, and Ausu'm.bubble tests, pressure held tes_ nnUhelium nr Fr_n leak Icst_ The objecm,es of [hLsCRP are:Since the ¢ffecn of aging on _ concrete (i) To produce a summary of current agingcontainmentarc generallyconsideredpredictah,c, managementpractio__-_nde.xpeneneesforthe techniques applied by nuclear plant._ xo _ncrctc containment s_,,"uccaresmitigate these effects are _tanctard industry. (2) To _mpile a report conminmg state-of-practices. These tecdzniqucs include: chc.art rcpair _echniques and materials(3) T_ develop crack mappmg and• Re.sin in!dorian or cpur,/mjectinn to {_II ;_e_pt:sncc criteria to repmr concretecracks and voids in concrete 1o protect _:ontainment ztructuresreinforcing ste_l from being c_xposeu to (_) To develop a set of practi,-_i cnndiuoncorrosiveenvironmcnl, incti_tor_and as_ciat_ guid_nes to• Prntecti_. coming, qualiHcd I'_r the aerator concrete containment stru_urcsenvironmentaJconditions,to protects_eetliner _nd con_ctc. To accomplish these objective_ the CRP is• Rcpair or replacement of _uipmcnt preparinga questionnaire to cunduct a survey ofhatcbe_and ha_h _calsto maintaina nuclearpowerplantowncrslup_ralo_."1"heaunreyle,aktight pressure boundary. ,]_Jestlonnalrc w)ll be evaluated by Ld_._ CRP• Retensmnmgot prcstrcssedtendonsin pdrticipants. Tn addition to general plantaccordancewith predetermined design information, the survcy requestsinformation invalues to ensure comainmcnt pre.ssure xn-scr_ce inspection programs, ago-relatedretention capability, dcgntdationcxpcHcnccs,andmitigationand repaUrprnctic_.s. The.CRP intends to makeavailabletheAs a result of tt_cPh,'u_ l finding, the IA_,A results of the survey to all participating plantde_rn_ncd Ihat the followingareas would rcquirc ownerslo_rator_to assisttheiragingma_llementadditional research: programs. The r_ults will not identtt_ indwidualplants nnd utilities who participate to protect the• current ex_rience and a._ingmanattcmcnt confidentialitv of _hesourc_ of information.practi_ including inservlccmspcct_un,It,slag, anU repmrs of all contamment ['he sur,,.cyquestionnaire _nsists of thrm_ nmjorstructural components _ections. The first section asks £or generalLlgonmllJon su_ as _ type, location, the coordinationwith intcrnsUonM _ andemmmd.,st in_ _ con_iom, receiving_ erumalLpmniclpe_lsApril,type of contaiamat and design features, and 1994. The effort to evaluate survey chela,pegfotmapplic:ablock=igu codes and standards. Although literature search to accomplish the Pha_ IIPbaao I identified a list of age-rclatcd degradation objectivct is expected to requite a _iailauln ofmo_ relatedto a concretecontainment,it three months, 'The CgP meanbesa_ agreedia _ that tim impact of tbeae mecataWms on a division uf respoostbiliUes to axlllllDate withcould vagy due to geographic locatiom and utilities, conduct reeamrch,and the pmpmation ofopemtiltg enviromnen_ The purpose of the final rqx,gt. The committee will maww, m tocoUegting this iofortaation is to correlate there discuss the finding and progress of rids effort inparametent with identified issuesand corr_tivc October, 1994. The final report is tentativelyanions, scheduleto be releaa_ mid-l P95.The second_ion of the surveyis designedto ]'LEFER,ENCEStauter information on practices m inspectvariousmaterials a_ugmte_ wzth thc _:mrete []] International Atomic Energy Agem,%contaiallmnt structure,. Information rcqucst_ "Methodology for the M_cnt ofincJudes inspe_mn and investigationprogramsfor Ageing of Nuclear Power Plantmaterials and component, commonly _s_ in a Component Important to Safety,"containment. These include concrete,anL_orage Techni_l Report Series No. _ (199_elements, reinforcing steel, pre.,strcsslngsteel,andmetallic or non.metaUic c_ntainment liner, aud [2] International Atomic Energy Agency,penetration a._emOti_. This section also requests "Pilot Studies on Management of Ageinginformation on the preventative maintenanc_ of Nuclear Power Plant Components.prograwa implementedat tl_e plant to rc_alr or Results of Phase l," IAEA-TECDOC-670to rcfurblsbconutmmentcompon,.:nts._nctthc (1092)effecT_enessof throe programs.131 [nternational Atomic F.aeq_ Agency,"["he purpo_ uf the 1.hLrd s_ctlon is to SOliCit "Safety.Aspectsof Nuclear PowerPlantexperiences related to repmr of the degradauon of Ageing," IAEA-TECDOC.5-10 (1990)the containment _tructurcdue to ._ormaloperation or any abnormal events, information [4] E!ectnc Power Research Institute,requested includethe identification atagc-relat,:d "/'rcssurizedWater Reactor Containmentdegradation m_tsms whichhave r_ult_ in StructuresLicense Renewal Industrydegradation: tdennficatiun of th_ remedial ._.),s Report." (1991)chosen to mitigate anyeffects of the degradation;and the assessmentof thc root cause of 15} Naus.D.J.,"ConcreteC_mponentAgingdegradation, including a determination oi de.sign and i's Significance Relative to Lifeor c_nstruaionrelateddcfccts. ro _ss]st Extensionof Nuclear Powr.lrPlants,"participantsto respond to the qu¢,'qiuns,a i=st_t NUR.EGICR-4652, ORNLTM-10059,deterioration manifestations c_mmonly c_hservcd Oak Ridge National Laboratory, Oakin a structure requiring repatr_ is provider1. Tire Ridge, Tcnn,September 1986age.related degradation mechanisms (.M_,DMs)that are the potential cau,_ of the_deteriorationshavebeen identtlicd in the PhaseTeffort.PHASE 1I SCHEDULETIle preparation of thesurvey que,stionna_rehasbeen completedandapprovectby IAEA and scntto utilitie_inFebruary.,1994 Thc _checlulefor

Concrete containment aging study

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Concrete containment aging study

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