ML113050632

Licensee Handouts from November 1, 2011 Meeting with STP Nuclear Operating Company on GSI-191

ML113050632
Person / Time
Site:	South Texas
Issue date:	10/26/2011
From:	Howe K, Leavitt J, Sande T, Zigler G ALION Science & Technology Corp, Univ of New Mexico
To:	Balwant Singal Plant Licensing Branch IV
Singal, B K, NRR/DORL, 301-415-301
Shared Package
ML113050615	List: ML113050623 ML113050632
References
TAC ME5358, GSI-191, TAC ME5359
Download: ML113050632 (27)

Text

Risk Informing STP GSI-191 Chemical EffectsRisk Informed GSI-191 Resolution Tuesday, November 1Public Meeting with STP Nuclear Operating Company 1Timothy D. SandeGilbert L. ZiglerDr. Kerry J. Howe Janet J. Leavitt11/1/11 Pre-Licensing Meeting OutlineRisk Informed GSI-191*Meeting Objective*Purpose of Chemical Effects Program

• Significant/Insignificant Contributors

• STPParameters11/1/11 Pre-Licensing Meeting 2

• STP Parameters*Previous Tests Relevant to STP

• Preliminary Ideas for Testing

• Preliminary Ideas for Risk Informed Application

• Conclusions Meeting ObjectiveRisk Informed GSI-191*Present the STP risk informed chemical effects approach to the NRC*Obtain NRC comments prior to developing aninitialtestplan11/1/11 Pre-Licensing Meeting 3 an initial test plan Risk Informed GSI-191*Fully understand physical and chemical phenomenon related to chemical effects at STP

through research, testing, and modeling*Develop an anal y tical model for chemical Goals of Risk Informed Chemical Effects Program11/1/11 Pre-Licensing Meeting 4 yprecipitate formation that can be implemented in CASA Grande*Develop an algorithm for chemical effects head loss that can be implemented in CASA Grande*Validate models with prototypical testing Significant ContributorsRisk Informed GSI-191*Time*Buffer

• pH*Temperature*Concrete Area

• Corrosion

• Dissolution

• Inhibition11/1/11 Pre-Licensing Meeting 5

• Temperature*Pool Volume

• Insulation Types

• Insulation Quantities

• Aluminum Area

• Inhibition*Solubility Limits

• Kinetics

• Precipitate Types

• Precipitate Properties Significant ContributorsRisk Informed GSI-191*Copper Area*Lead Area

• Zinc Coatings

• AcidFormation*HX Temperature Drop

• Retrograde Solubility11/1/11 Pre-Licensing Meeting 6

• Acid Formation*Concrete Aging

• RCS Chemistry

• RWST Chemistry Insignificant ContributorsRisk Informed GSI-191*Carbon Steel*Galvanized Steel

• Nickel*OrganicMaterial11/1/11 Pre-Licensing Meeting 7

• Organic Material*RCS Crud

• Radiolysis Products

• Biological Effects STP ParametersRisk Informed GSI-191*Buffer: TSP*Nominal pH: ~7.6

• LBLOCA Containment Temperature: 260°F max to120°Fat30days11/1/11 Pre-Licensing Meeting 8 to 120 F at 30 days*LBLOCA Pool Temperature: 267°F max to 126°F at 30 days*Pool Volume: 31,431 ft 3 min, 89,350 ft 3 max*Nominal Spray Duration: 12 hr STP ParametersRisk Informed GSI-191*RCS Chemistry: 1,400 -0 ppm boron, 3.5 -0.4 ppm lithium, 1 -<0.1 ppm Silica*RWST Chemistry: 2,850 -2,975 ppm boron, 1 -6 ppm Silica11/1/11 Pre-Licensing Meeting 9*Pool Chemistry: 2,372 -2,878 ppm boron*Insulation: Nukon, Microtherm (penetrations), SS RMI (reactor cavity)*Coatings: Epoxy, IOZ, Polymide, Alkyd, Enamel

• Nominal Aluminum Area: 5,567 ft 2

STP Time Dependent pHRisk Informed GSI-19111/1/11 Pre-Licensing Meeting 10 STP Time Dependent TemperatureRisk Informed GSI-191 150°Fat35days11/1/11 Pre-Licensing Meeting 11 150 F at 3.5 days140°F at 7 days Previous Tests Relevant to STPRisk Informed GSI-191*WCAP-16530 (single effects)*WCAP-16785 (partially integrated effects)

• ICET Test 2 (integrated effects)

• AlionVogtleVuezTests(integratedeffectswith11/1/11 Pre-Licensing Meeting 12

• Alion Vogtle Vuez Tests (integrated effects with head loss)*Alion Vogtle and Calvert Cliffs High Temperature Vertical Loop (HTVL) Tests (aluminum solubility)

STP WCAP-16530 PredictionRisk Informed GSI-191Material ReleasedQuantity (kg)Calcium*63.06Silicon208.85Aluminum82.9211/1/11 Pre-Licensing Meeting 13PrecipitateQuantity (kg)

Sodium Aluminum Silicate649.5Aluminum Oxyhydroxide35.7Calcium Phosphate*162.7*Includes marinite source that is no longer in containment STP WCAP-16785 PredictionRisk Informed GSI-191RefinementAluminum (ppm)NaAlSi 3 O 8 (kg)AlOOH (kg)Ca 3 (PO 4)2 (kg)BaseCase82.9649.5 35.7162.7SiliconInhibition18.3177.40.0162.7PhosphateInhibition69.4649.55.6162.711/1/11 Pre-Licensing Meeting 14 Solubilit yLimits82.90.00.0162.7 ICET Test OverviewRisk Informed GSI-191ICET Test Number Controlling pH buffer systemInsulation (%)Measured pHChemical byproductsVisible at test temperatureVisible upon coolingFiberglassCal-Sil1Borate (NaOH)10009.3 -9.5NoYes2Phosphate (TSP)10007.1 -7.4NoNo3Phosphate (TSP)20807.3 -8.1Yes, only during first few hours No11/1/11 Pre-Licensing Meeting 15hours4Borate (NaOH)20809.5 -9.9NoNo5Borate (Borax)10008.2 -8.5NoYesTest Duration: 30 daysTest Temperature: 140°F Spray Duration: 4 hr Water Chemistry: Boron, lithium hydroxide, hydrochloric acid Comparison to ICET Test 2 InputsRisk Informed GSI-191Material TypeSTP Quantities*Ratio of STPQuantities to Max Pool Volume Ratio of ICET Test 2 Quantities to Tank Volume Ratio ICET/STPAluminum submerged700 ft 20.007834 ft 2/ft 30.179 ft 2/ft 322.8Aluminum exposed to spray6300 ft 20.070509 ft 2/ft 33.34 ft 2/ft 347.411/1/11 Pre-Licensing Meeting 16Fiberglass insulation submerged2385.1 ft 30.026694 ft 3/ft 30.103 ft 3/ft 33.9Mariniteinsulation submerged15.2 ft 30.00017 ft 3/ft 3-0.0Microtherm insulation submerged1.8 ft 32.01E-05 ft 3/ft 3-0.0Concrete submerged5700 ft 20.063794 ft 2/ft 30.015 ft 3/ft 30.2*Quantities are taken from conservative inputs used in STP WCAP calculation, mariniteremoved, concrete only exposed to spray, etc.

ICET Test ResultsRisk Informed GSI-191 100 150 200 250 300 350 400 450 minum concentration (mg/L)Test 1 unfilteredTest 1 filtered 20 30 40 50 60 70 80 minum concentration (mg/L)Test 5 unfilteredTest 5 filtered11/1/11 Pre-Licensing Meeting 17 0 500102030Alu mTime (days)(a)0 100102030Alu mTime (days)(b)Aluminum concentration below detection limit for Tests 2, 3, 4Aluminum concentration leveled off over time for Tests 1, 5 Inverse trend between aluminum and silicon concentrations Alion Vogtle Vuez Test ResultsRisk Informed GSI-191*Minimal aluminum in solution*No precipitates observed

• Head loss increased ~15xover30days11/1/11 Pre-Licensing Meeting 18

~1.5x over 30 days , possibly due to effect of

fiber bed dissolution (NUREG/CR-6808)Increasing head loss due to Nukon dissolution (reproduced from NUREG/CR-6808 Figure 7-23)

Alion Vogtle and Calvert Cliffs HTVL TestsRisk Informed GSI-191 Vogtle*Buffer: TSP*Aluminum: 4 ppm

• Silica: 26 pp m Calvert Cliffs*Buffer: NaTB

• Aluminum: 10 ppm

• Silica: 60 pp m11/1/11 Pre-Licensing Meeting 19 pp*pH: 7.6 -7.8

• Results: No precipitation at temperatures as low as 128°F pp*pH: 7.4*Results: No precipitation at temperatures as low as 60°F Preliminary Ideas for TestingRisk Informed GSI-191*Perform integrated tests to determine material corrosion/dissolution/release rates and

characterize precipitates in order to develop

thermodynamics and kinetics models11/1/11 Pre-Licensing Meeting 20*Perform benchtop or autoclave tests to further develop database for models*Perform HTVL tests with replicated precipitates and varying debris loads to develop a chemical effects head loss algorithm Test Characterization of PrecipitatesRisk Informed GSI-191*VUEZ tests indicate precipitates form as crystals, with nucleation

on fiberglass fibers, 11/1/11 Pre-Licensing Meeting 21 rather than amorphous precipitates forming in

the pool as predicted by

WCAP-16530 Preliminary Ideas for Application to Risk Informed AnalysisRisk Informed GSI-191*Use thermodynamics (and if possible) kinetics models to develop a chemical module for CASA

Grande that can be used to calculate chemical

precipitate types and quantities for any 11/1/11 Pre-Licensing Meeting 22combination of parameters applicable to STP*Develop a chemical effects head loss algorithm that can be incorporated in the head loss module for CASA Grande that is applicable to the ranges of chemical and non-chemical debris

loads at STP Thermodynamics ModelingRisk Informed GSI-19111/1/11 Pre-Licensing Meeting 230.1 1 10 1001000406080100120140160180200220Solubility Limit forAluminum (mg/L)Temperature (F)pH = 7.0pH = 7.5 Risk Informed GSI-191*Particulate Chemical Precipitate:-NUREG/CR-6224 Head Loss Correlation-Chemical particulate modeled as other particulates, i.e., surface to volume ratio and densityChemical Head Loss Modeling11/1/11 Pre-Licensing Meeting 24*Amorphous Chemical Precipitate:-Develop a bump-up factor algorithm for low amorphous chemical precipitate to fiber loads-Interpolate WCAP-16530 head loss testing results Risk Informed GSI-191*Perform an Integrated 30 day test-Realistic simulation of STP conditions:*Temperature time history*Materials exposed to sprayValidation of Chemical Precipitate Model11/1/11 Pre-Licensing Meeting 25*Submerged material and debris

• Flow through a fiber bed-Fluid analysis-Weight loss measurements

-SEM of fiber bed Validation of Chemical Head Loss ModelRisk Informed GSI-191*Perform Vertical Head Loss tests with chemical particulate simulant-Compare Vertical Head Loss test results with NUREG/CR-6224 calculations11/1/11 Pre-Licensing Meeting 26-Wide range of eta (particulate to fiber weight ratio)-Wide range of debris bed thickness ConclusionsRisk Informed GSI-191*Currently available data indicates that chemical effects at STP is far less severe than predicted by the standard WCAP-16530 methodology

• A combination of testin g and modelin g can be 11/1/11 Pre-Licensing Meeting 27 ggused to develop a realistic prediction of chemical effects for STP*A chemical module and modified head loss module will need to be implemented into CASA Grande for evaluation of full range of scenarios