ML13305A144

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Rlbloca, Revision 3 - Post-Submittal Meeting, Areva, Oct. 31, 2013S, Lides
ML13305A144
Person / Time
Site: Millstone  Dominion icon.png
Issue date: 10/31/2013
From: Burghelea A, Gerken L, Holm J
AREVA
To:
Office of New Reactors
References
Download: ML13305A144 (56)
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Text

RLBLOCA Revision 3

- Post-submittal Meeting Jerry Holm, Andrei Burghelea, Lisa Gerken October 31 st, 2013 AR EVA

Agenda Io Objectives lo Schedule to Support Millstone Unit 2 Fuel Delivery Oo Organization of the RLBLOCA (EMF-2103 Revision 3) Topical Report Oo RLBLOCA Revision 3 changes and disposition of the effect of those changes Oo Overview of new models Oo Sample problems Oo RLBLOCA Revision 0 SER Restrictions Oo Summary Oo Next Steps Io Schedule A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 2 AR EVA

Objectives I' Initiate review of topical report Oo Discuss/Agree on a review schedule 1o Summarize organization of topical report N Relationship to previous revisions Oo Summarize topical report contents Old material New material A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 3 A R EVA

RLBLOCA Review History I Oo Transition package 2008 through today Reviewed in a number of plant specific LARs (6 total)

Oo Revision 2 November 2010 lo Revision 2 Supplement I December 2011 0o Revision 3 September 2013

.,,Combines above information Adds Fuel Swelling Rupture and Relocation Model RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 A

4AREVA

Safety Benefits of RLBLOCA Revision 3 Oo Support use of M5 cladding Lower oxidation

.,,High performance under new 10 CFR 50.46 rule

l. Thermal conductivity degradation - IN 2009-23 0o Accounts for pre-transient oxidation - IN 98-29 Oo-Accounts for fuel swelling, rupture, and relocation

<..,Currently being required by reviewers and requested by commissioners for new 10 CFR 50.46 rule A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 5 AR EVA

Schedule to Support Millstone Unit 2 Fuel Upgrade (M5 Cladding)

Timeline for RLBLOCA (EMF-2103, Revision 3)

Octo*er 2013 - April 2015 18-Month NRC Review of AREVA EMF-2103, Rev, 3 (RLBLOCA)

Octob NR(

EMF-21 Septernoer 2013 Re AREVA Submits EMFo2103, Rev 3 Nov to NRC 2r 2013 egins Apri 3, Rev3 NRCA flew EMF-21 2015

)proves 23, Rev 3 mber 2013 October 201C NRC isSwes Marc' 2015-Mardh 2016

>nth NRC Review of Domimnoi LAP 12-M Februeary 2017 MPS2 Cy 25 Fuel Delivery

  • Y January 2014 July 2013 October 2013 AREVA/NRC Post-Submittal Meeting (W/ Dominion)

January 2015 Janusary N [ Ck 0 Stt

)ul i 2016 January 2017 March 2015 Dominion Submits RLBILOCA LAR to NRC MaW.5 2016 NRC Approves Domnion RLBLOCA LAR (Final SER; RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 6AREVA

Organization of the RLBLOCA Topical Report-Revision 3 I

Oo EMF-2103, Revision 3 follows the EMDAP structure as specified by Regulatory Guide 1.203 Oo The revised Topical Report comprises 10 sections and 4 appendices covering the 20 steps outlines in RG 1.203 EMDAP and overlapping the 14 steps defined in CSAU lo Most of the technical content remains the same as provided in Revision 2 Oo Revision 3 items with a significant amount of changes from Revision 2

/ Fuel Swelling, Rupture and Relocation (FSRR) Model

  • Sub-Channel Cooling Model (SCCM) as part of FSRR 0 Grid Cooling Model (GCM)

A RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 7 AR EVA

Organization of the RLBLOCA Topical Report-Revision 3 (cont.)

Oo Section 1.0 Introduction I' Section 2.0 Summary and Conclusions (Overview and organization, identifies changes and new material)

Oo Section 3.0 Regulatory Requirements

!o Section 4.0 Scenario Identification Oo Section 5.0 Evaluation Model Requirements (PIRT)

Oo Section 6.0 Assessment Data Base Description (Assessment Matrix)

Oo Section 7.0 Evaluation Model Computer Codes Description Oo Section 8.0 Assessment Results (Verification and Validation)

Io Section 9.0 Evaluation Model Description (Nodalization definition, sensitivity and uncertainty analysis)

Oo Section 10.0 Quality Assurance AV RLBLOCA Revision 3 -Post-submittal Meeting - October 31, 2013 8 A R E VA'

Organization of the RLBLOCA Topical Report - Revision 3 (cont.)

OlAppendices OAppendix A presents in an abridged format the model input development guidelines and the analysis guidelines Appendix B describes sample licensing analyses performed with the RLBLOCA EM for three base models of NPPs, representing each of the three plant classes covered by this EM Appendix C addresses SER restrictions on Revision 0, which should not be applicable to Revision 3.

/,Appendix D presents system analysis time step sensitivity study to demonstrate the adequacy of S-RELAP5 numerics.

A RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 9 AR EVA

Start of Proprietary Information RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 A

lo AR EVA

NRC Concerns Addressed by EMF-2103 Revision 3 l The NRC outlined eight technical issues with AREVA's RLBLOCA EM, specifically EMF-2103 Rev. 0 & Transition Program US

~ ~

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.g NR ocr drse n

eiin23Peiul Thermal Conductivity Implementation of COPERNIC (Rev. 2/3)

No Degradation 2

Once-burnt fuel is more Yes*

highly oxidized and because of TCD may have higher initial stored energy L

3 Including corrosion in local Maximum Local Oxidation (MLO) calculation Yes*

oxidation metric accounts for the operational (pre-transient) and transient oxidation (Rev. 2/3) 4 Sampling of Decay Heat Yes*

A RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 11 AR EVA

NRC Concerns Addressed by EMF-2103 Revision 3 US0CCocr Addese in Reiso 2/

Preiosl aproei AR 5

Sampling of Core Power 6

Clad ballooning, rupture, fuel relocation, and two-sided cladding oxidation 7

Rod-to-rod radiation not included in the model L

New model for Fuel Swelling, Rupture and Relocation (Rev. 3) j Yes*

No Interior oxidation of the cladding included in the MLO for the ruptured node (Rev. 3)

The poSt-CHF heat transfer model now includes provisions for thermal radiation between structures (rod-to-rod), applied only to the hot rods (Rev. 2)

Yes*

No L

]

RL3LOCA Revision 3 - Post-submittal Meeting - October 31, 2013 12 AR EVA

NRC Concerns Addressed by EMF-2103 Revision 3 US NR ocr Addese in Reiso 2/

Previousl appove in LA 8

The statistical approach in Revision 0 does not cover the multivariate outcome, as required by 10 CFR 50.46 The statistical evaluation has been upgraded, with the application of the Tukey's methodology, to provide a multi-variant evaluation.

No

  • - These features were approved in a number of licensing applications, most recently in Letter from T. Orf, NRC to M. Nazar, Florida Power and Light Company, "St. Lucie, Unit I - Issuance of Amendment Regarding Extended Power Uprate (TAC No. ME5091)", July, 9, 2012 (ADAMS Accession No. ML12181A019).

A RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 13 A*,R E"VA

RLBLOCA Revision 3 Technical Upgrades (cont.)

0o The EM builds on and incorporates much of the Revision 0 approach.

lo The changes outlined below include the additions or changes from Revision 0 and identifies their previous documentation.

looThis includes items of the Modifications made for the "Transition Program" 9 Additions included in Revision 2 Changes made in Supplement I to Revision 2 Additions originally provided here in Revision 3 11 There are nineteen EM Changes from Rev. 0 Code changes affecting the models implemented in S-RELAP5 Application changes affecting the way the method is applied A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 14 AR EVA

Code changes

1. Dispersed Rev. 3)

Flow Heat Transfer (Rev. 2, modified in

./

0 0

0 0

~, Presented in Section 7.6.7.2 and assessed in Sections 8.1.5, 8.2.1, 8.2.4, 1" Presented in Section 7.6.7.2 and assessed in Sections 8.1.5, 8.2.1, 8.2.4, 8.4.1 and 8.4.4.

A RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 15AREVA

Code changes (cont.)

2.

Rod-to-rod Radiation (Rev. 2, modified in Rev. 3)

Based on RELAP5/MOD3.3 radiation model 7K>

0 Presented in Section 7.6.8.2 and Section 9.0 and assessed in Sections 8.1.5, 8.2.5, 8.5.2.4 and 8.6.2.1.

A OCA Revision 3 - Post-submittal Meeting - October 31, 2013 16 AR EVA RLBLI

Code changes (cont.)

3.

Fuel Swelling, Rupture and Relocation Modeling (Rev. 3)

K

]

The details of this change are presented in Sections 7.9.3.3 and 7.5.4.11.

<> Briefly presented later in this presentation A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 17AREVA

Code changes (cont.)

4.

Correction to the Steam Absorptivity (Rev. 3) w In computing the vapor absorption coefficient, the pressure is conservatively truncated This modification is presented in Section 7.6.8.1 and its impact assessed in Section 8.1.5.

5.

Grid Spacer Droplet Breakup Heat Transfer Enhancement (Rev. 3)

A model to increase the heat transfer downstream of a grid spacer due to droplet breakup was added. The implementation is expected to have an impact during reflood above the mid-plane of the core.

As this impact was greater than the other EM changes, the FLECHT-SEASET and FLECHT Skewed benchmarks were repeated to assess the impact of the change, as summarized in Section 8.2.18 "N

This alteration is presented in Section 7.5.4.10.1 Briefly discussed later in this presentation A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 18AREVA

Code changes (cont.)

6.

Cold Leg Condensation Model ("Transition Program", revised in Rev. 3)

The cold leg condensation model I The revised model predicts more accurately the cold leg condensation [

] resulting in near saturated fluid conditions at the downcomer entrance, thus increasing the potential for downcomer boiling 0> This change is presented in Sections 8.2.9, 8.2.10, and 8.5.1.14

7.

Interfacial Drag Package (Rev. 2) 0, The interfacial drag package has been modified with improved logic for transition between flow regimes to cover a wider range of experimental data The details of this alteration are presented in Section 7.5.2

8.

Interphase Heat Transfer (Rev. 2) 0N The interphase heat transfer for mist flow was modified to raise steam and cladding temperatures and to obtain better agreement with test data from separate effects reflood tests The details of this change are presented in Section 7.5.4 A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 19AREVA

Application changes

9.

Core Nodalization (Rev. 3)

KA J

This modification is presented in Section 9.0 and its impact assessed in Section 8.1.5

10. Steam Generator Tube Inlet Interfacial Drag (Rev. 3)

The model change is presented in Section 9 and assessed in Section 8.1.5

11. Reported Local Cladding Oxidation (Rev. 2, Supplement 1)

The operational (pre-transient) and interior oxidation (ruptured node) of the cladding is accounted for compliance with the maximum local oxidation criteria of 10 CFR 50.46 Presented in Section 7.9.3.5 and Appendix A, sub-section A.2.3.10 A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 2o AR EVA

Application changes (cont.)

12. Second Cycle Fuel ("Transition Program" and Rev. 2, Supplement 1)

This alteration is presented in Appendix A

13. COPERNIC Fuel Performance Code (Rev. 2)

C> In response to NRC concerns over thermal conductivity degradation 0 The COPERNIC fuel performance code has replaced RODEX3A as the source of fuel initial conditions

  • . COPERNIC is NRC approved for application to M5 cladding, and Revision 3 requests approval of the limited application of COPERNIC to Zircaloy 4 cladding for LOCA applications

<' This alteration is presented in Section 7.9 and assessed in Sections 8.3.1, 8.4.8, and 8.5.1.15 A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 21 AR EVA

Application changes (cont.)

14.

Break Modeling ("Transition Program")

< The break modeling was altered from EMF-2103, Revision 0 to concur with the approach outlined in Regulatory Guide 1.157

]

This modification is presented in Section 8.5.2.6

15.

Sampling of Core Power (Rev. 2)

The model change is presented in Section 3.1.3.2.2

16.

Decay Heat Simulation (Rev. 2, Supplement 1)

(

The details of this change are presented in Section 8.5.1.17 and was approved in previous licensing submittals

17.

Clarification of Single Failure (Rev. 2, Supplement 1)

The documentation of the treatment of single failure within the evaluation model is upgraded to clarify the approach The revised documentation is provided in Appendix A, sub-section A.2.4.1.1 A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 22 AR EVA

Application changes (cont.)

18. Treatment of GDC-35 (Rev. 2)

GDC-35 states that the plant shall be able to mitigate design basis accidents with or without offsite power available 0 The methodology determines the most severe condition between these two configurations and the RLBLOCA statistical analysis is performed for the selected configuration

( The change is discussed in Section A.2.4.2

19. Statistical Evaluation (Rev. 2)

<'. The statistical evaluation has been upgraded, with the application of the Tukey's methodology, to provide a multi-variant evaluation

> This alteration is presented in Section 9.4

<- Presented briefly later in this presentation A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 23 AR EVA

Revision 3-EM Changes Overall Impact on the Benchmarks 0o The entire suite of benchmarks were re-executed, with Rev. 3 modeling, as part of the Continuity of Assessment (COA - S-RELAP5 V&V) process 0o The only EM change having an observable impact on the benchmarks is the implementation of the Grid Cooling Model (GCM) which has an impact on heat transfer during a low pressure reflood 00 Therefore, the benchmarks documented in Section 8 are unchanged from those for Revision 2 except for the information in Section 8.2.18 and 8.4.1.4 A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 24 AR EVA

Overview of Significant Changes for Revision3 Il Two models were added in Revision 3

< Grid Cooling Model Fuel Swelling, Rupture and Relocation

  • Statistical Treatment of Cladding Radial Swelling, Rupture and Fuel Relocation

" Sub-channel Cooling Model Ol The statistical evaluation has been upgraded 0> New multivariate method based on Tukey's method for determining non-parametric tolerance regions A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 25 AR EVA

Grid.Cooling Model Oo A grid spacer droplet shatter model has been developed for S-RELAP5 reflood applications Po Based upon model developed and approved for application in BEACH Concept similar to model used in COBRA-TF Po Allows for:

Weber number dependent droplet shatter Reduction of droplet diameter and assessment of fine drop effects Higher vaporization increases steam flow and reduces steam temperature O-Paper by Cho et al. from KAERI (2011) 6 x 6 rod bundle Droplet shattering on a mixing vane RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 A

26 AR EVA

Grid Cooling Model (cont.)

Oo When droplets interacts with grid and their impact Weber number exceeds the threshold, the droplets shatter creating micro-droplets and smaller droplets fr The high surface area-to-volume ratios of the micro-droplets cause them to evaporate rapidly downstream of the grid lo The evaporation produces saturated steam which mixes with superheated steam, resulting in cooling of the rod downstream of the grid A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 27 AR EVA

Grid Cooling Model Benchmarks OoThe following FLECHT-SEASET and FLECHT Skewed benchmarks were repeated to assess the impact of the model:

  • i*:* 31504, 31701, 31302, 31203, 31805, 32013, 34209, 13609, 13914 OoThe model is presented in detail in Section 7.5.4.10.1 A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 28 A R E VA

Grid Cooling Model Benchmarks Results FLECHT Test 31504 A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31,.2013 29 AR EVA

Grid Cooling Model Benchmarks Results (cont.)

FLECHT Test 31805

- A 30 AR EVA RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013

Grid Cooling Model Benchmarks Results (cont.)

FLECHT Test 13609 RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 A

31 AREVA

Grid Cooling Model Benchmarks loConclusion Peak cladding temperatures above the mid-plane of the core were indeed observed to be closer to measured data, suitable for use in a BE model A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 32 AR EVA

Fuel Swelling, Rupture and Relocation Models l Statistical Treatment of Swelling, Rupture, and Fuel Relocation C, Fuel relocation during LOCA occurs if cladding ruptures RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 A

33 AREVA

FSRR Implementation in RLBLOCA A

g-October31, 2013 34 AR EVA RLRLOCA Revision 3 - Post-submittal Meetin

Sub-Channel Cooling Model Oo Experiments Reviewed 0 REBEKA-4 (5x5 array)

. REBEKA-6 (7x7 array)

REBEKA-7(7x7 array)

CEGB (44 rods) 0 Achilles (69 rods)

Oo Conclusions from test results

< Rupture cooling is a sub-channel T-H phenomenon K Vapor flow through blockage wrup SW rup = sub-channel blockage fraction at the rupture location based on strain G Almost all droplets pass through blockage lo These conclusions form the basis for the sub-channel cooling model A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 35 AR EVA

Sub-Channel Cooling Model (cont.)

A-Revision 3 - Post-submittal Meeting - October 31, 2013 36 AR EVA RLBLOCA

Statistical Evaluation P RLBLOCA demonstrates compliance to the first 3 10 CFR 50.46 criteria using non-parametric statistics

.L

.4 Wcadin V mbrittiem~hE-1 A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 37 AR EVA

a tistical Evaluation 38 AR EVA RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013

Statistical Evaluation RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 39 AR EVA

tistical Evaluation 40 AREVA RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013

Statistical Evaluation A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 41 AREVA

Statistical Evaluation A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 42 AR EVA

Sample Problems lo Sample RLBLOCA analyses were performed to demonstrate the application of the methodology

/

3 Plant Types:

" Westinghouse 3-loop PWR

" Westinghouse 4-loop PWR

  • Combustion Engineering 2x4 PWR Ki None of the sample problems are fully representative of any specific plant

<" Fuel calculations performed with COPERNIC for AREVA fuel with M5 cladding Oo Modeling of plant components, analysis, and results evaluation was performed by following the guidelines presented in Appendix A of EMF-2103 Rev. 3 A

RLBLOCA Revision. 3 - Post-submittal Meeting - October 31, 2013 43 AR EVA

Sample Problems Paamte I

CE 2x Power SG Tube Plugging Fq FAH Fuel Design Cladding Po The W3 sample problem is presented in the following slides Io All 3 sample problems are presented in Appendix B of EMF-2103 Rev. 3 A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 44 AR EVA

3 Sample Problem A

45 AR EVA RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013

W3 Sample Problem Po PCT Trace (Independent of Elevation) for MRMC Case:

A RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 46 AR EVA

W3 Sample Problem 0o The limiting case is not alone sufficient to describe the analysis results Oo To further characterize the analysis results, additional parameters and plots are provided

/ Maximum values for the 95195 case set Scatter plots of results for the 95/95 case set 0> Mean values for the entire case set A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 47 AR EVA

I Sample Problem A

48 AR EVA RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013

W3 Sample Problem

-A 49 AR EVA RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013

3 Sample Problem A

50 AR EVA RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013

,ample Problems:

mmary of Results A

51 AREVA RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013

Revision 0 SER Restrictions 0o The SER on EMF-2103, Revision 0 noted several limitations, concerns, and deficiencies resulting in restrictions on the methodology and the use of S-RELAP5. A disposition of each of these items, referred to as "SER Restrictions", is provided with each analysis performed with that methodology 0o Appendix C of EMF-2103, Revision 3 describes the items which are addressed by Revision 3 As they are addressed by the methodology, analysis-specific dispositions of these particular items are not necessary Po These Revision 0 restrictions do not need to be applied to Revision 3 A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 52 AR EVA

Summary lo Schedule designed to support Millstone Unit 2 fuel upgrade (M5 cladding)

RLBLOCA LAR SER - Desired March 2016 Fuel delivery

- February 2017 0 EMF-2103 Revision 3 reorganized to facilitate review Oo Most changes in EMF-2103 Revision 3 are associated with EMF-2103 Revision 2 and Supplement 1 Transition package Oo EMF-2103 Revision 3 contains two main changes Fuel Swelling, Rupture and Relocation 0 Grid cooling model - adopted from a previously approved topical report A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 53 AR EVA

Next Steps OoAudit History of review supports an early audit Transition package 2008 through today o Reviewed in a number of plant specific LARs (6 total)

Revision 2 November 2010 Revision 2 Supplement 1 December 2011 IlRAI Focus on information necessary for SER Use audits and telephone calls to support review

0. Draft SER 0-Final SER A

RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 54 AR EVA

Schedule to Support Millstone Unit 2 Fuel Upgrade (M5 Cladding)

Timeline for RLBLOCA (EMF-2103, Revision 3)

Octatier 2013 - April 2015 18-Vionth NRC Ftu'ew of AREVA EINF-2103, Rev. 3 (R1,RLOCA)

Octob r 2013 NRC Begins Apri EMF-21 )3, Rev 3 NRC A September 2013 Re Fiew EMF-2I AREVA Submits EMF-2103, Rev 3 o

October 2014 to NRC Nov, r

),11 N

12-M

'015

)proves

)3. Rev 3 March 2015 - March 2016

)nth NRC Review of Dominion LAP Feoruajy 2017 MPS2 Cy 25 Fuel Delivery January 2017 Jafluaj, 2014 Jarjarv 2015 July 2013 October 2013 AREVA/NRC Post-Submittal Meeting (w/ Dominion)

March 2015 Dominion Submits RLBLOCA LAP to NRC 3inuary 2016 NRC so fWrtt ',FFRI RLFI~fi, A cu Marcti 2016 NRC. Approves Dominion RLBLOCA LAR

{Finai SER)

/k RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013 55 AR EVA

Acronyms lo ANS - American Nuclear Society CHF - Critical Heat Flux o

COA - Continuity of Assessment lo CSAU - Code Scaling Applicability, and Uncertainty P

CWO - Core-Wide Oxidation l

EM - Evaluation Model o

EMDAP - Evaluation Model Development and Assessment Process EPRI - Electric Power Research Institute FLECHT - Full-Length Emergency Cooling Heat Transfer o

FSRR - Fuel (Cladding) Swelling and Rupture, and (Pellet Fragments) Relocation l

GCM - Grid Cooling Model 0

GDC - General Design Criteria HT - heat transfer LAR - License Amendment Request o

MLO - Maximum Local Oxidation P

MPS - Millstone Power Station o

MRMC - Minimum Retained Margin to Criteria o

NRC - U.S. Nuclear Regulatory Commission 0

PCT - Peak Clad Temperature RAI - Request for Additional Information o

RLBLOCA - Realistic Large Break Loss-of-Coolant Accident RSG - Recirculating Steam Generator 0

SCCM - Sub-Channel Cooling Model (related to FSRR) o SEASET - Systems Effects and Separate Effects Test l

SER - Safety Evaluation Report o

SG - Steam Generator o

TCD - Thermal Conductivity Degradation 0

V&V - Verification and Validation N W3 loop RSG plant 0

W4 -.4-loop RSG plant A

56 AR EVA RLBLOCA Revision 3 - Post-submittal Meeting - October 31, 2013

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