Statistical Universal PowerReconstruction with Fixed MarginTechnical Specifications (SUPR-FMTS)Post-Submittal Meeting
Gayle ElliottJesse KlingensmithRich KochendarferDick Deveney
AR EVA
Presentation Overview
Oo Introduction GFE
Pp Background and Objectives RAK
Oo FMTS Background RAK
lo Changes to FMTS RAK
P SUPR JJK
lo Concluding Remarks JJK
Oo Summary and Next Steps GFE
AREVA Post Submittal Presentation - SUPR-FMTS - October 26. 2010 - D.2 AR EVA. .. . . . . . . . .. . . . . . . . . . . . . . .. . . . . ... I
Introduction
lo Discuss the SUPR and the FMTS methodologies and theirapplication to PWR-type reactors
No Obtain timely NRC feedback and interactions to support
regulatory review process
OP Respond to preliminary NRC feedback to cover:
1. The scope of the review as stated in Section 1.4. The TR addresses the technical issues associatedwith Super-FMTS, yet requests approval of the FMTS methodology with regard to Westinghouse andCE plants. Figure 1.1 contains insufficient information with regard to a comparison of the performanceof FMTS vs. Super-FMTS methodologies.
2. The NRC did not find discussion of the W, CE and B&W measurement systems. The interactionbetween FMTS and Super-FMTS appears to be central to the request for approval and there arecommon elements to the methodologies.
AAREVA Post Submittal Presentation - SUPR-FMTS - October 26, 2010 - p.3 ARE EVA,
Background Discussion
Io PWRs presently measure RPD with one of severalinstrumentation systems
> Movable Detectors (TIP, etc.)
* Fixed Incore Detector (FIC)
* A combination of the two (Aeroballs and FICs)
Oo Used for monitoring operation of the core with periodic userequirements
Oo Preserves initial peaking assumptions for all events (LCOlimits) by means of monitoring global power
Axial Flux Difference (AFD), Quadrant Power Tilt (QPT), Rod PositionLimit (RPL)
-AAREVA Post Submittal Presentation - SUPR-FMTS - October 26, 2010 - p.4 AR EVA
SUPR-FMTS Objectives
Pp Support of multiple/diverse core power distributionmeasurement systems, e.g. TIP, FIC, Aeroball
c Kriging, RPD Check, Online Simulator
Oo Preserve safety analysis assumptions through directmonitoring of margin to power peaking limits rather thansecondary indicators (AFD, QPT, RI)
Q FMTS (Fixed Margin Technical Specifications, BAW-10158P-A)
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.I Extension of flux map surveillance intervals in plants withinterval measurements (non-continuous, e.g. TIP)
<* RPD Check, Online Simulator
c RPD Check use is optional. Need is determined by uncertainty analysisJ
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U.o
=AAREVA Post Submittal Presentation - SUPR-FMTS - October 26, 2010- p.5
FMTS Background
A
Tech Spec MonitoringRequirements for FMTS
No Monitor Limiting Conditions of Operation (LCO)
0 LCO only -> no change to Limiting Safety System Settings (LSSS)
lo Monitor peaking rather than an overly restrictive combinationof RPL, AFD, and QPT parameters to preserve peaking limits
O Assure that the core is operating as designed
0 Preserve design basis for LSSS and backup LCO limits
Op Define actions when criteria are exceeded as determined bythe licensing basis
AREVA Post Submittal Presentation - SUPR-FMTS - October 26, 2010 - p.7 ARkEV
Peaking Margin for Direct &Indirect Limits
In(lirect DireCt (FMTS)
Limitoperation margin for.steady, state effects t7
Worst:
.V(z). time inxenonrod posquadrai
-operating margin'fortransientý &steady state-effects,cycle
di stribution
;itionnt tilt
419r
4
SUPR-FTMSSystem:uncertaintymeasurement:or. inferred measurementat.all times
Power Peak Measurement-.(stea (lyý state- oilly)
.measurement'.uncertainty*
.4AAREVAAREVA Post Submittal Presentation - SUPR-FMTS - October 26, 2010 - p.8
Monitoring RequirementsFMTS affects some, but not all, LCO
LCO Limits LSSS Limits
Monitored Directly Unchanged Unchanged
IJnsertion) insertion)
A•AREVA Post Submittal Presentation - SUPR-FMTS - October 26, 2010 - p.9
Nuclear Instrumentation(RPD) Systems
O Categorize measurement systems according to:" Frequency" Data densityK> Directness
t Need to combine all measurementsK> Consider strengths & weaknesses of each measurement system
N Example - TIP v. FIC v. Thermocouple v. Core Simulator
Core Simulator
Futt reTIP
Aeroball
'a FIC• [T/C
Exe )relow.
-tr
low high
frequency AAREVA Post Submittal Presentation - SUPR-FMTS - October 26. 2010- p.10 •AR E•VA..................................... ... ) I
FMTS Modifications
,AtAIR.EV"A
FMTS FlowchartFigure. 1.2-1 FMTS. Monitoring .Procedure
Core
3D -PowerDistribution
Signal n -Power ,Margin Ratio and
Condition'ing :Conversion Calculation Alarms
raw Limitingsigaw s.Peakingsignals. Criteria
AAREVA Post Submittal Presentation - SUPR-FMTS - October 26, 2010 - p.12 AREVA
Comparison of FMTS andSUPR-FMTS
Amfiw
- -an5MMMlI-A
laW Ir CE
AAREVAAREVA Post Submittal Presentation - SUPR-FMTS - October 26, 2010 - p.13
Proposed Clarification
1. The scope of the review as stated in Section 1.4. The TR addresses thetechnical issues associated with Super-FMTS, yet requests approval of the FMTSmethodology with regard to Westinghouse and CE plants. Figure 1.1 containsinsufficient information with regard to a comparison of the performance of FMTSvs. Super-FMTS methodologies.
2. The NRC did not find discussion of the W, CE and B&W measurementsystems. The interaction between FMTS and Super-FMTS appears to be centralto the request for approval and there are common elements to themethodologies.
Topical Text, from Section 1.4:Application of the margin monitoring portion of the FMTS methodology toWestinghouse (W), EPR, and Combustion Engineering (CE) plants, as well as thepreviously approved Babcock and Wilcox (B&W4) plants [6]. This extension is based onthe previous approval for Babcock and Wilcox plants, the improvement in bothdirectness and frequency of power distribution monitoring, and the improvedquantification of measurement system uncertainty through the use of the Monte Carlosimulation methodology for determining system uncertainty.
AAREVA Post Submittal Presentation - SUPR-FMTS - October 26,2010 - p.14 AR EVA
Characteristic UncertaintyDiscussion
Po Quantify Uncertainty in:
K* Measurement systems (r Po7tP t Disribntion
tcrs Mcasurcment* Plant parameters 3
SReconstruction methodsetes
AAiR•EVAAREVA Post Submittal Presentation - SUPR-FMTS - October 26, 2010 - p.15
Determination of Total SystemUncertainty
Oo Sample uncertaintiesusing Monte Carlosimulator
O Calculate the effect ofuncertainty during "hardto measure" events
Oo Quantify theuncertainty,
total/system
[2
AAREVA Post Submittal Presentation - SUPR-FMTS - October 26, 2010 - p. 16
Application to Meet Tech Spec (Requirements
SUPR section produces RPDmeas and process uncertainty
FMTS section compares adjusted RPD to limit criteria with margincalculation
Limits based on available margin
Action required when negative margin condition occurs -> moverods, and/or lower power to restore margin
Monitor operation relative to design to ensure the basis for LSSS &backup LCO limits are preserved.
AREVA Post Submittal Presentation - SUPR-FMTS - October 26, 2010- p.17 AR EVA
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21Note; LCO fuel design criteria are
a. During a LOCA, peak cladding temperature must not exceed 22000 F.b. During a loss of flow accident., there must be at least 95% probability at the
95% confidence level (the 95/95 DNB. criterion) that the hot fuel. rod in thecore does not experience a DNB condition.
q. During an ejected rod accident, the fission energy input to the fuel must notexceed 280 cal/gm.
d. The control rods must be capable of shutting down the reactor with a mini-mum required SDM with the highest worth control rod stuck fully withdrawn..
Margin Calculations with FMTS
Calculate margin as:
MIVIt,k. = (1 -
RPDi,jk" Rioca" * FppFlex} 100Li,j,k
Where F.,c includes the total system uncertainty and the adjustedprocess variance.
E
AAREVA Post Submittal Presentation - SUPR-FMTS - October 26, 2010 - p.19
SUPR - Statistical UniversalPower Reconstruction
AA!R EVA
Power ReconstructionMethodology (SUPR) Overview
0 Reconstruct power with localized kriging models
Oo Dynamically calculate the process variance of the local model
Oo When using infrequent power measurements - RPD Checkroutines are used to:
* Calculate Assembly Exit Thermocouple and ExCore detector responses
*• Compare calculated to measured responses
* Impose variance penalties if necessary
AAREVA Post Submittal Presentation - SUPR-FMTS - October 26, 2010 - p.21 A4R.EVA.
The Model Illustrated
AA R!EVAAREVA Post Submittal Presentation - SUPR-FMTS - October 26, 2010 - p. 2 2
Background on KrigingProcess
lo Kriging
Named after Danie G. Krig, South African mining engineer who, in1951, developed empirical models of ore grade distribution based onsampled points
o Formalized by Georges Matherton
* Founder (1968) "Centre de Geostatistique et de MorphologicMath~matique" at Paris School of Mines in Fontainbleau
* Considered to be the "father" of spatial statistics
0o Example applications
* Interpolating grades of ore between measured points
* Intelligent combination of sparse, accurate measurements withplentiful, less accurate measurements (rain gauge and radarmeasurements of rainfall)
AREVA Post Submittal Presentation - SUPR-FMTS - October 26, 2010- p.23 AR 1EVA...... .. . ... . ... s I
Interpolation with KrigingModels
Oo Form of the statistical model:
y(x) = g(x) + E(x)where
g(x) is the trend model
e(x) is the error, a random deviation from the trend
lo Assuming an unbiased model and introducing the covariancefunction, the model becomes:
Y(x0) = g(xo) + r(xo)TR'!(y _ g)
,AA'R 1EVAREVA Post Submittal Presentation - SUPR-FMTS - October 26, 2010 - p.24
Interpolation with KrigingModels, II
Io Expanding the kriging model:
R(x0,xj)
R(x0 ,,XN)
R R(xi, x1)R x XN
R(xl,. xN,)
.R(XN,rx1) 1R(X1,XN) I
VA-AREVA Post Submittal Presentation - SUPR-FMTS - October 26, 2010 - p.25
Variance Calculation
Oo The kriging variance is:o2(Xo) -Var [•(Xo) - y(Xo)]
lo Approximated as:
P"AAREVA Post Submittal Presentation - SUPR-FMTS - October 26, 2010 - p.26 A!RE.V:A•
RPD Check - CalculateResponses
lo NOTE: Only used for systems with significant time intervals
between measurements
O Generate responses based on reconstructed power
O, Assembly exit thermocouple temperatures
Calibrate mass flow at measurement time
Calculated Tout using enthalpy balance
0 ExCore detector power signals
Adjoint weights correlate power to current
Calibrated values convert current to voltage
l Evaluate all responses w.r.t. kriging variance
AAREVA Post Submittal Presentation - SUPR-FMTS - October 26. 2010 - p.27 A~REVA..... ............. . a I
RPD Check - CompareResponses
A R !E•VA•AREVA Post Submittal Presentation - SUPR-FMTS - October 26, 2010 - p.28
RPD Check - VarianceAdjustment
R, •V VA,AREVA Post Submittal Presentation - SUPR-FMTS - October 26, 2010 - p.29
RPD Check - VarianceAdjustment
ARAREVA Post Submittal Presentation - SUPR-FMTS - October 26, 2010 - p.30
Concluding Remarks
AAiR!E VA
Conclusions
SUPR-FMTS utilizes the present instrumentation systems, theiruncertainty analyses, along with the Technical Specifications (withminor modifications) and core monitoring approach.
SUPR provides a method to consistently use diverse core powerdistribution measurement systems to maintain the applicability ofthe safety analysis and take advantage of the strengths of eachdiverse measurement system.
FMTS monitors the core power distribution relative to theCondition II and LOCA peaking limits based on the three-dimensional measured power distribution.
SUPR-FMTS takes advantage of thermocouple and excore detectorsignals for plants with infrequent measurement systems (TIP) topossibly extend flux mapping intervals.
AREVA Post Submittal Presentation - SUPR-FMTS - October 26, 2010 - p.32 AIR EV
Summary and Next Steps
OP Commence formal review and RAI process
O Approval of Statistical Universal Power Reconstruction
with Fixed Margin Technical Specifications (SUPR-FMTS)
Topical Report
AARE VA
AREVA Post Submittal Presentation - SUPR-FMTS - October 26, 2010 - p.33
List of Acronyms andAbbreviations
AFD - Axial Flux DifferenceCOLR - Core Operating Limits Report
ExCore - Excore neutron detector
FIC - Fixed In-Core detectorFMTS - Fixed Margin Technical Specifications
IC-DNB - Initial Condition, Departure from Nucleate Boiling
LCO - Limiting Condition of OperationLOCA - Loss Of Coolant AccidentLSSS - Limiting Safety System Setting
NRC - Nuclear Regulatory CommissionPWR - Pressurized Water Reactor
QPT - Quadrant Power Tilt
RPL - Rod Position LimitRPD - Relative Power Density
SUPR - Statistical Universal Power ReconstructionTIC - ThermocoupleTIP - Traveling In-core Probe
Tech Spec - Technical Specifications
AAREVA Post Submittal Presentation - SUPR-FMTS - October 26. 2010- D.34 A!R E-VA
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