ML112350873
| ML112350873 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 08/22/2011 |
| From: | Letellier B, Sande T ALION Science & Technology Corp, Los Alamos National Laboratory |
| To: | Office of Nuclear Reactor Regulation |
| Singal, B K, NRR/DORL, 301-415-301 | |
| Shared Package | |
| ML112350857 | List: |
| References | |
| TAC ME5358, GSI-191, TAC ME5359 | |
| Download: ML112350873 (76) | |
Text
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA Risk-Informed GSI-191 Slide 1 South Texas Project Models and Methods Used for CASA Grande Bruce Letellier Los Alamos National Laboratory Los Alamos, NM Tim Sande Alion Science and Technology Albuquerque, NM Risk-Informed GSI-191 Resolution NRC Public Meeting Monday, August 22, 2011
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Overview
Required Inputs to CASA Grande
Topical Approach and Implementation Plan Debris Generation Debris Transport Head Loss Air Intrusion Debris Bypass
Interface With PRA
Example Calculations to Illustrate Physics Models Slide 2
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 REQUIRED INPUTS TO CASA GRANDE Slide 3
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Debris Generation Containment geometry Pipe break (LOCA) frequencies ZOI size/shape for plant materials Debris characteristics for plant materials Qualified coatings quantity for LOCA categories Unqualified coatings quantity Latent debris quantity Miscellaneous debris quantity Slide 4
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Chemical Product Generation None required for initial quantification effort (initially assuming negligible impact for chemical effects)
Slide 5
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Debris Transport Blowdown transport fractions for LOCA categories Washdown transport fractions for LOCA categories Pool fill transport fractions for LOCA categories Recirculation transport fractions for LOCA categories Fiberglass erosion fractions for non-transporting pieces of debris No inputs required for upstream blockage in initial quantification Slide 6
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Head Loss Strainer area/geometry Flow rate ECCS/CS pump NPSH margin Slide 7
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Air Intrusion Vortexing
- Flow conditions (water level and flow rate) that would result in vortexing based on prototypical strainer testing (may not be an issue for PCI Sure-Flow design)
Gas desorption
- Containment pressure
- Containment pool temperature
- Strainer submergence depth Slide 8
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Debris Bypass No additional input required for initial quantification effort.
Slide 9
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 TOPICAL APPROACH AND IMPLEMENTATION PLAN Slide 10
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Debris Generation Calculations CASA Grande will calculate debris quantities generated within given ZOIs for:
Multiple break locations (welds on RCS pipes, wall rupture)
Multiple break sizes at each location (2 to DEGB)
Multiple jet orientations (if a non-spherical ZOI is used)
Each type of insulation material in the vicinity of the break Slide 11
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Input for Containment Geometry Import containment geometry from CAD model Concrete walls (robust barriers) imported using STL files Piping insulation imported through text files Weld locations imported through text files Equipment insulation recreated using primitive shapes Slide 12
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 CASA Grande Prototype Slide 13
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Input for LOCA Frequencies Import LOCA frequency curves for each weld or other potential break location Slide 14
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Normalized Freq Conditional Prob Slide 15
CASA Grande will only sample conditional probabilities
Epistemic uncertainties on break frequency can be propagated if needed but no further epistemic factors will be segregated
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Input for ZOI Sizes and Shapes
Define ZOI size and shape for each insulation material ANSI Jet ZOI Insulation Debris Volume = 10.2 ft3 Spherical ZOI Insulation Debris Volume = 13.4 ft3 Slide 16
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Implementation Plan for ZOIs
Plan for initial quantification effort:
Use standard spherical and hemispherical ZOIs Use standard ZOI sizes (i.e. 17D ZOI for Nukon) scaled to appropriate break sizes
Options for 2012 refinements:
Modify ZOI shape using ANSI jet model, results of CFD modeling, etc.
Modify ZOI size using PWROG blast testing, more realistic interpretation of AJIT data, CFD modeling, etc.
17-D ZOI for 31 DEGB at STP encompasses approximately half of Nukon insulation in SG compartments Slide 17
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Input for Debris Characteristics
Input appropriate debris characteristics:
Insulation size distribution (fines, small pieces, large pieces, intact blankets)
Coatings size distribution (particulate, chips)
Latent debris distribution (fiber, particulate)
Bulk and material densities for debris Characteristic size of fine material Slide 18
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Implementation Plan for Characteristics
Plan for initial quantification effort:
Use NEI 04-07 baseline size distribution (fines and large)
Assume all unqualified coatings fail as 10 micron particulate Use standard NEI 04-07 guidance for size and density
Options for 2012 refinements:
Alion refined size distribution (fines, small, large, and intact)
Partial unqualified coatings failure based on EPRI report Unqualified epoxy fails as chips based on CPSES report Proprietary Alion debris size distribution methodology is used to determine quantity of fines, small pieces, large pieces, and intact blankets based on distance of insulation from the break Slide 19
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Input for Unqualified Coatings Input unqualified coatings debris quantity:
Total quantity of 3,366 lbm based on STP unqualified coatings logs Epoxy, IOZ, phenolic, alkyd, baked enamel Generic example of unqualified coatings debris following a DBA test Slide 20
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Input for Qualified Coatings
Input qualified coatings debris quantity for bounding LBLOCA:
Total quantity of 586 lbm based on STP debris generation calculation Epoxy, IOZ, Polyamide Primer
Options for 2012 refinements:
Calculate bounding coatings quantities for various LOCA categories (i.e. large, medium, and small breaks)
Blast testing of qualified coatings system Slide 21
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Input for Latent Debris Input latent debris quantity:
Total quantity of 200 lbm based on STP debris generation calculation (latent debris survey showed 152 lbm) 85% dirt/dust, 15% fiber Generic example of latent debris collected from containment Slide 22
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Input for Miscellaneous Debris Input miscellaneous debris quantity:
Total assumed quantity of 100 ft2 based on assumption in STP debris generation calculation labels, tags, plastic signs, tie wraps
Options for 2012 refinements:
Evaluate transport potential for miscellaneous debris based on existing test data.
Generic examples of labels and tie wraps Slide 23
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Chemical Product Generation Calculations If necessary, CASA Grande will automatically calculate chemical debris quantities generated based on:
Quantity of fiberglass debris in containment pool Quantity of aluminum or other chemically reactive materials exposed to sprays or submerged in the pool Buffer type and time dependent pH in containment pool Time dependent temperature in containment pool Containment spray duration Slide 24
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Input for Chemical Products Plan for initial quantification effort:
- Assume negligible impact from chemical effects for STP based on initial review of applicable ICET results Options for 2012 refinements:
- Implement WCAP-16530 method if it is determined not to be overly conservative for STP
- Implement alternative method depending on approach used to account for chemical effects on the debris bed head loss Example of chemical goo produced using WCAP-16530 recipe for STP test SEM photo from ICET Test #2 (TSP with Fiberglass)
Slide 25
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Debris Transport Calculations CASA Grande will use logic trees to calculate debris transport fractions with branches for:
Blowdown transport Washdown transport Pool-fill transport Recirculation transport Erosion Slide 26
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Implementation Plan for Blowdown
Plan for initial quantification effort:
Assume 100% of fine/small debris blown to pool Assume large pieces retained on grating based on STP debris transport calculation
Options for 2012 refinements:
Incorporate methods used in STP debris transport calculation for LOCA categories Refine blowdown calculations based on drywell debris transport study (DDTS) and other methods Slide 27
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Implementation Plan for Washdown
Plan for initial quantification effort:
Assume 100% of fine/small debris washed to pool Assume large pieces retained on grating based on STP debris transport calculation
Options for 2012 refinements:
Incorporate methods used in STP debris transport calculation for LOCA categories Refine washdown calculations based on drywell debris transport study (DDTS) and other methods Slide 28
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Implementation Plan for Pool-Fill
Plan for initial quantification effort:
Assume 100% of small debris remains in active pool Assume fine debris transports with flow (small amount transported to strainer and inactive regions)
Options for 2012 refinements:
Perform CFD analysis to more accurately quantify pool-fill transport for small pieces of debris Slide 29
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Implementation Plan for Recirculation
Plan for initial quantification effort:
Assume 100% transport of debris in active recirculation pool
Options for 2012 refinements:
Incorporate methods used in STP debris transport calculation for LOCA categories Perform additional CFD runs to address realistic flow conditions (water level and flow rate)
Modify assumed debris distribution Modify conservative transport metrics Incorporate time dependence in the transport analysis Slide 30
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Implementation Plan for Erosion
Plan for initial quantification effort:
Assume 1% spray erosion for small and large fiberglass debris held up on gratings above containment pool Erosion for non-transporting small fiberglass debris in pool is N/A since this debris is all assumed to transport
Options for 2012 refinements:
Apply proprietary Alion erosion test results for realistic recirculation pool erosion fraction Setup for Alion fiberglass erosion test with filter in flume suction pipe Slide 31
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Implementation Plan for Upstream Blockage
Plan for initial quantification effort:
Assume negligible based on STP debris transport calculation
Options for 2012 refinements:
Further evaluate potential for upstream blockage including blockage associated with a reactor nozzle break and any uncertainties associated with the current analysis One of the two 6 inch drains in STP refueling canal One of the four 30 inch vent holes in STP secondary shield wall Slide 32
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Head Loss Calculations
CASA Grande will use a correlation to determine head loss over the range of relevant conditions:
Strainer geometry Debris loads
Fiber
Particulate
Microporous
Chemical Flow rate Temperature NPSH margin Slide 33
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Implementation Plan for Head Loss Correlation
Plan for initial quantification effort:
Use NUREG/CR-6224 correlation for fiberglass, particulate, and chips Assume microporous debris (minimal at STP) behaves similar to other particulate Assume chemical debris has negligible impact on head loss Assume uniform debris deposition and flow through strainer Calculate time dependent head loss
Options for 2012 refinements:
Perform tests to validate and/or refine head loss correlation for STP:
Perform tank testing to determine head loss reduction from non-uniform deposition on a complex geometry strainer, etc.
Perform vertical loop testing to determine head loss characteristics for Microtherm, WCAP-16530 chemical debris surrogate, etc.
Perform integrated chemical effects tests to more accurately quantify chemical effects
Develop a bump-up factor or correlation to account for chemical debris Slide 34
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 NUREG/CR-6224 Correlation NUREG/CR-6224 correlation was developed based on flat plate vertical loop head loss testing with Nukon, iron oxide sludge, and paint chips:
Where:
H = head loss (ft-water)
Sv = surface-to-volume ratio of the debris (ft2/ft3)
= dynamic viscosity of water (lbm/ft/sec)
U = fluid approach velocity (ft/sec)
= density of water (lbm/ft3) m = mixed debris bed solidity (one minus the porosity)
Lm = actual mixed debris bed thickness (in)
= 4.1528x10-5 (ft-water/in)/(lbm/ft2/sec2); conversion factor for English units
(
)
U
)
1
(
66 0
U 57 1
5 3
2 3
5 1
2 m
m m
V m
m V
L S
S H
+
+
=
Slide 35
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Strainer Geometry
Input strainer area and gap dimensions based on strainer drawings
Calculate average approach velocity based on total strainer area
Calculate interstitial volume based on gap dimensions
Calculate increased approach velocity for large debris loads based on circumscribed strainer area Photos and layout of STP PCI strainer Slide 36
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Strainer Dimensions
Strainer area (per train) =
1,818.5 ft2
Circumscribed area (per train) = 419.0 ft2
Interstitial Volume (per train)
= 81.8 ft3 Photos of STP PCI strainer Slide 37
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Strainer Debris Loads
Use debris generation and transport calculations for quantity and characteristics of debris on strainer for each postulated break at STP:
Fiberglass Coatings particulate/chips Microtherm Dirt/dust Miscellaneous debris Chemical debris STP head loss test with fiber and particulate debris Slide 38
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Flow Rate and Temperature Input total flow rate through each ECCS strainer for the specific case analyzed (maximum of 7,020 gpm per train at STP based on 1,620 gpm per HHSI pump, 2,800 gpm per LHSI pump, and 2,600 gpm per CS pump)
Calculate debris accumulation on each strainer based on relative flow split Input pool temperature to determine fluid density and viscosity Slide 39
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 NPSH Margin
Input NPSH margin for each safety injection and containment spray pump
Compare calculated debris bed head loss to the pump NPSH margin to determine whether the pump would fail
NPSH Required LHSI Pumps = 16.5 ft HHSI Pumps = 16.1 ft CS Pumps = 16.4 ft
NPSH Available (excluding clean strainer and debris losses)
Start of Recirculation (267 F) = 22 ft 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> (171 F) = 42 ft 30 days (128 F) = 51 ft Slide 40
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Time Dependence
A number of parameters used to determine ECCS strainer head loss are time dependent:
Unqualified coatings failure Chemical product generation Debris transport and accumulation Total ECCS sump flow rate Pool temperature
Due to changes in pool temperature, NPSH margin is also time dependent
Some aspects of time dependence will be factored into CASA Grande to avoid over-conservatisms Slide 41
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Air Intrusion Calculations
CASA Grande will use test results and correlations to determine conditions that result in vortexing and gas desorption, along with the corresponding void fractions
Froude numbers will be calculated to determine whether gas bubbles would accumulate or be drawn into sump suction piping
Void fractions will be evaluated to determine:
Potential for gas binding of ECCS pumps Effect of void fraction on NPSH Reduced efficiency of pumps, heat exchangers, etc. due to void fraction and resulting effects on system performance Slide 42
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Vortexing
Air intrusion due to vortexing is not an issue for STP since strainer design and configuration (under bounding water level and flow rate conditions) preclude vortex formation Generic strainer vortex test Slide 43
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Gas Desorption
Gas desorption void fractions will be calculated based on the strainer head loss, pool temperature, strainer submergence, and containment pressure based on Henrys Law Where CG = Saturation concentration of air KG = Henrys constant for air at a given temperature T = Temperature PG = Partial pressure of air G
G G
P T
K C
=
)
(
Slide 44
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Debris Bypass Calculations CASA Grande will calculate debris bypass quantities based on test data and flow conditions The bypass debris quantities will be an output of CASA Grande used as an input for downstream effects calculations Slide 45
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Implementation Plan for Bypass
Plan for initial quantification effort:
Use correlation of fiber bypass vs. flow rate developed by Gil Zigler :
BPtotal (g) = 1.538
- Q (gpm)
Options for 2012 refinements:
Conduct bypass testing to evaluate bypass over the range of flow and debris load conditions for STP Slide 46
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 INTERFACE TO PRA Slide 47
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 CASA Interface to PRA
Separate results will be compiled for each standard LOCA size (small, medium, large)
Breaks below 2 diam will be assigned zero impact in the PRA All rupture opening sizes will be examined before binning Containment histories computed for conservative representatives of each size
Conditional probabilities will be utilized to avoid confusion with PRA time-rate frequency assignments
Alternative sump configurations will be assessed to match mechanical failure branches Later basis for possible operator mitigative action Slide 48
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 EXAMPLE CALCULATIONS TO ILLUSTRATE PHYSICS MODELS Slide 49
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Break Frequencies for Cold Leg Welds Slide 50 Location Anywhere in Plant Each BF in Cold Leg Each BJ in Cold Leg Probability SLOCA at Specific Location 1
3.55E-05 6.56E-07 Cumulative Conditional Rupture Probability Given at Least a 0.5in.
Break 0.5 1.00E+00 3.55E-05 6.56E-07 0.8 3.10E-01 1.10E-05 2.03E-07 1.0 2.37E-01 8.40E-06 1.55E-07 1.5 1.65E-01 5.85E-06 1.08E-07 1.99 1.39E-01 4.95E-06 9.13E-08 2.0 1.38E-01 4.91E-06 9.07E-08 3.0 1.04E-01 3.69E-06 6.81E-08 4.0 8.17E-02 2.90E-06 5.36E-08 5.99 5.80E-02 2.06E-06 3.80E-08 6.0 5.80E-02 2.06E-06 3.80E-08 6.8 5.07E-02 1.80E-06 3.33E-08 14.0 2.79E-02 9.91E-07 1.83E-08 20.0 1.71E-02 6.06E-07 1.12E-08 31.5 9.18E-03 3.26E-07 6.02E-09 44.5 5.40E-03 1.92E-07 3.54E-09 Based on total SLOCA Frequency of 2.04E-3 from NUREG/CR-6928 Excludes SGTR
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Example Break Case Slide 51 Cold leg break at BF weld next to RCP Break size equivalent to an 8 inch pipe break (i.e. an 8 inch hole in the side of the cold leg) 17D Spherical ZOI for Nukon*
28.6D Spherical ZOI for Microtherm*
- Since the break would result in a single sided jet (rather than two jets from a double ended guillotine break), the ZOI would be half the volume of the spherical ZOIs and could be modeled as a hemisphere per the NEI 04-07 guidance. To simplify the analysis, however, this example calculation conservatively uses the spherical ZOI.
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Nukon Debris Generation
17D ZOI x 8 inch diameter break = 11.3 ft radius sphere
Quantity of Nukon = 141.0 ft3
Fines (7 m diameter) =
0.60
- 141.0 ft3 = 84.6 ft3
Large (>4 inch pieces) =
0.40
- 141.0 ft3 = 56.4 ft3
Density Bulk = 2.4 lbm/ft3 Material = 175 lbm/ft3 Slide 52
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Microtherm Debris Generation
28.6D ZOI x 8 inch diameter break = 19.1 ft radius sphere
Volume = 1.2 ft3 = 18 lbm
Bulk Density = 15 lbm/ft3
Mass = 1.2 ft3
- 15 lbm/ft3 = 18 lbm
Fines = 1.00
- 18 lbm = 18 lbm
Microtherm Distribution 3% fiber = 6 m diameter, 165 lbm/ft3 58% SiO2 = 20 m, 137 lbm/ft3 39% TiO2 = 2.5 m, 262 lbm/ft3 Slide 53
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Coatings Debris Generation
586 lbm qualified coatings debris for bounding LBLOCA from STP debris generation calculation (based on 5D ZOI):
33 lbm epoxy = 10 m, 94 lbm/ft3 553 lbm IOZ= 10 m, 457 lbm/ft3
3,366 lbm unqualified coatings debris from STP debris generation calculation:
247 lbm alkyd = 10 m,97-195 lbm/ft3 843 lbm IOZ = 10 m,97-256 lbm/ft3 268 lbm baked enamel = 10 m,82-187 lbm/ft3 294 lbm epoxy dispersed through containment = chips*,75-118 lbm/ft3 1,714 lbm epoxy in reactor cavity = chips*, 130-140 lbm/ft3 Slide 54
- Epoxy chips will be assumed to be 10 m particulate for initial quantification
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Latent and Misc. Debris Generation
200 lbm latent debris from STP debris generation calculation:
170 lbm dirt/dust = 17.3 m, 169 lbm/ft3 12.5 ft3 fiber = 7 m diameter, 175 lbm/ft3
100 ft2 miscellaneous debris from STP debris generation calculation Slide 55
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Blowdown and Washdown Transport
100% blowdown and/or washdown transport to pool at t = 0 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> assumed for following debris:
Nukon fines Microtherm Qualified coatings Latent debris
Large pieces of Nukon retained on grating in SG compartments or upper containment; erosion fines assumed to reach the pool at t =
24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />
Unqualified coatings in reactor cavity would not transport
Other unqualified coatings assumed to fail and reach containment pool at t = 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />
Miscellaneous debris assumed to reach strainer at t = 0 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> Slide 56
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Pool Fill Transport Where x(t) = Time dependent concentration of debris in pool xi = initial concentration of debris in pool t = time Q = Flow Rate Vpool = Pool Volume Slide 57
)
/
(
)
(
pool V
Q t
ie x
t x
=
Pool Cavity V
V up fill e
F
=1
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Pool Fill Transport, Cont.
Slide 58 Pool volume inside secondary shield wall at 18 inch depth = 5,046 ft3 Cavity volume for each sump = 240 ft3 Inactive cavity volume (containment sump and elevator pit) = 749 ft3 Split proportional to volumes:
8% to two active sumps 4% to inactive sump 13% to inactive cavities 25
.0 1
3 3
3 046
,5 749 240 3
)
(
=
=
+
ft ft ft Cavity Sump ECCS up fill e
F
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Erosion of Large Pieces of Nukon Slide 59 An erosion fraction of 1% was used for large pieces of Nukon retained in upper containment: 56.4 ft3
- 0.01 = 0.6 ft3
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Time Dependent Recirculation Transport
Total sump flow rate for two train operation = 14,040 gpm
Total pool volume corresponding to 3.19 ft minimum LBLOCA water level: 46,955 ft3
Initial concentration of debris at the beginning of recirculation (t = 24 minutes) includes 75% of the Nukon, Min-K, qualified coatings, and latent debris fines. At t = 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, the concentration will be increased to include 100% of the unqualified coatings and Nukon erosion fines.
Pool turnover time = 25 minutes Slide 60
)
/
(
)
(
pool V
Q t
ie x
t x
=
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Time Dependent Recirculation Transport, Cont.
Slide 61
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Time Dependent Recirculation Transport, Cont.
Slide 62
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Nukon Debris Transport (Fines)
Blowdown to pool: 100%
Washdown to pool: 100%
Pool fill:
4% to each strainer 13% to inactive regions
Recirculation to strainers:
0% to inactive strainer 50% to each active strainer
Erosion: N/A
Overall Transport: 83%
Slide 63
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Nukon Debris Transport (Large)
Blowdown to pool: 0%
Washdown to pool: 0%
Pool fill: N/A
Recirculation to strainers:
N/A
Erosion:
Spray: 1%
Pool: N/A
Overall Transport: 1%
Slide 64
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Microtherm Debris Transport (Fines)
Blowdown to pool: 100%
Washdown to pool: 100%
Pool fill:
4% to each strainer 13% to inactive regions
Recirculation to strainers:
0% to inactive strainer 50% to each active strainer
Erosion: N/A
Overall Transport: 83%
Slide 65
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Qualified Coatings Debris Transport (Fines)
Blowdown to pool: 100%
Washdown to pool: 100%
Pool fill:
4% to each strainer 13% to inactive regions
Recirculation to strainers:
0% to inactive strainer 50% to each active strainer
Erosion: N/A
Overall Transport: 83%
Slide 66
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Unqualified Coatings Debris Transport (Fines)
Blowdown to pool: N/A
Washdown to pool: 100%
Pool fill: N/A
Recirculation to strainers:
0% to inactive strainer 50% to each active strainer
Erosion: N/A
Overall Transport: 100%
Transport for Unqualified Coatings in Reactor Cavity:
0%
Slide 67
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Latent Debris Transport (Fines)
Blowdown to pool: N/A
Washdown to pool: 100%
Pool fill:
4% to each strainer 13% to inactive regions
Recirculation to strainers:
0% to inactive strainer 50% to each active strainer
Erosion: N/A
Overall Transport: 83%
Slide 68
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Time Dependent Transport Quantities Slide 69 Debris t = 24 min t = 3 hr t = 24 hr t = 27 hr Nukon Fines 6.8 ft3 70.2 ft3 70.2 ft3 70.2 ft3 Nukon Large 0.0 ft3 0.0 ft3 0.0 ft3 0.6 ft3 Microtherm 1.4 lbm 14.9 lbm 14.9 lbm 14.9 lbm Qualified Epoxy 3 lbm 27 lbm 27 lbm 27 lbm Qualified IOZ 44 lbm 459 lbm 459 lbm 459 lbm Unqualified Alkyd 0.0 lbm 0.0 lbm 0.0 lbm 247 lbm Unqualified Epoxy 0.0 lbm 0.0 lbm 0.0 lbm 294 lbm Unqualified IOZ 0.0 lbm 0.0 lbm 0.0 lbm 843 lbm Unqualified Baked Enamel 0.0 lbm 0.0 lbm 0.0 lbm 268lbm Latent Dirt/Dust 14 lbm 141 lbm 141 lbm 141 lbm Latent Fiber 1.0 ft3 10.4 ft3 10.4 ft3 10.4 ft3 Miscellaneous Debris 100 ft2 100 ft2 100 ft2 100 ft2
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Head Loss Calculations Slide 70 Basic assumptions for example calculation:
Homogeneous and contiguous bed at every composition and all times No chemical product formation Particulate limited bed compression Equal debris to each of the two operating trains Debris transported during pool fill-up placed uniformly on strainer despite later submergence history
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Geometric Loading Table Slide 71
Clean strainer area of 1818.5 ft2
Circumscribed area of 419 ft2
Circumscribed debris load of 0.5 in and 82 ft3
Fiber loading shown as blue dots
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Bed-Inventory History Slide 72
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Particle-to-Fiber Mass Ratio ()
Slide 73
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Head Loss Summary Slide 74 Time (hr)
Temp (F)
LHSI NPSHR (ft)
NPSHA (ft)
NPSH Margin (ft)
Strainer HL (ft) 0.4 267 16.5 22.1 5.6 0.0 3
246 16.5 22.0 5.5 0.2 24 171 16.5 41.9 25.4 0.4 27 169 16.5 42.0 25.5 3.3 720 128 16.5 50.9 34.4 4.4
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Gas Desorption Calculations Slide 75
The gas void fraction can be calculated using the flow rate (7,020 gpm), time dependent temperature and head loss, and the following assumptions:
Saturated equilibrium conditions in the containment pool 100% relative humidity in containment Containment pressure of 14.7 psia when temperature is less than 212F Average strainer submergence of 22 inches Time (hr)
Temp (F)
Strainer HL (ft)
Air Released (ft3/hr)
Void Fraction
(%)
24 171 0.4 0
0.00 27 169 3.3 66 0.12 720 128 4.4 87 0.15
Operated by Los Alamos National Security, LLC for the U.S. Department of Energys NNSA August 22, 2011, NRC PreLicensing Meeting Risk-Informed GSI-191 Debris Bypass Calculations Slide 76 Fiber bypass fraction is calculated using the correlation:
BPtotal (g) = 1.538
- Q (gpm)
Total sump flow rate for two train operation is 14,040 gpm with 8,840 gpm through the SI pumps and 5,200 gpm through the CS pumps STP reactor vessel: 193 fuel assemblies BPtotal = 1.538
- 14,040 gpm = 21,600 g (47.6 lbm; 19.8 ft3)
Split to SI pumps: 21,600 g * (8,840 /14,040) = 13,600 g Split to CS pumps: 21,600 g * (5,200 / 14,040) = 8,000 g Incore fiberglass debris load: 70.5 g / fuel assembly