Development of an ORIGEN-based Reactor Analysis Module for Cyclus
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1 Development of an ORIGEN-based Reactor Analysis Module for Cyclus Steven E. Skutnik Assistant Professor Department of Nuclear Engineering Cyclus progress update ANL 10/23/2014
2 Overview of topics ORIGEN-based Nuclear Fuel Inventory Module (NFIM) Background, goals, and design approach ORIGEN design improvements for fuel cycle options analysis Descriptive reactor data library formats Generalized cross-section interpolation ORIGEN builder s API Progress and future outlook
3 Why go with physics based-approaches? Many fuel cycle simulator tools (e.g., VISION, DANESS, et. al.) rely on pre-calculated fuel recipes for nuclide tracking Problems with recipes: Difficult to perturb for fuel cycle operating conditions Cannot reasonably capture effects from material recycle; key to fuel cycle options analysis
4 Why incorporate ORIGEN for reactor analysis? Validated capabilities Extensive radiochemical assay benchmark data Flexibility Most fuel cycle operations supported Able to accommodate new fuel & reactor types based on TRITON transport calculations Scope ORIGEN tracks over 2000 individual nuclides; essential for capturing a broad range of timescales
5 How do we incorporate ORIGEN into Cyclus? Newest ORIGEN API facilitates direct, inmemory calls to ORIGEN solver By developing a portable, embeddable depletion engine, ORIGEN operations can be wrapped into a Cyclus-friendly format Depletion engine builds from ORIGEN API Portability: a buildable API toolkit which can exist outside of SCALE
6 How does the NFIM fit in to Cyclus? Nuclides Fuel cycle data ORIGEN-based depletion engine Nuclear Fuel Inventory Module ORIGEN reactor data libraries Output nuclides
7 The depletion engine must be portable Depletion engine must encapsulate all required ORIGEN functionality without dependence on outside SCALE modules Implies folding in numerous SCALE operations modules / capabilities Cross-section library interpolation (ARP) Output processing (OPUS)
8 The depletion engine must be self-sufficient Resources used by the depletion engine (i.e., reactor data libraries) should be selfcontained, having no outside dependencies Implies a new approach to data libraries Self-describing: Reactor data libraries have sufficient information to describe all necessary interpolation operations Self-interpolating: Reactor data libraries capable of generating problem-specific data
9 Proposed capabilities of the NFIM Generate a Cyclus-style vector of depleted nuclides, given: Input Cyclus nuclide vector Basic fuel cycle data Decay of a given Cyclus-style nuclide vector Continuous feed/removal of nuclides Stream batching & batch separations Note this supports more than just reactor archetypes!
10 ORIGEN design improvements for fuel cycle options analysis Infrastructure enhancements to ORIGEN designed to support the development of the Nuclear Fuel Inventory Module
11 ORIGEN infrastructure development for NFIM ORIGEN reactor data library modernization Development of a new ORIGEN data library format Generalized ORIGEN data library interpolation capabilities Depletion engine builder s API
12 Modernized ORIGEN reactor data libraries Assembly type Lattice types PWRs Babcock & Wilcox 15x15 Westinghouse 14x14, 15x15, 17x17, 17x17-OFA Combustion Engineering 14x14, 15x15 Siemens 14x14 BWRs Atrium 9x9-9, 10x10-9 General Electric 7x7-0, 8x8-1, 8x8-2, 9x9-2, 10x10-8 SVEA 64(8x8-1), 96(10x10-4), 100(10x10-0) Others AGR CANDU 28-pin, 37-pin RBMK VVER-400 Flat, radial enrichments (3.82, 4.25, 4.38) VVER-1000 Flat enrichment
13 CANDU assembly models developed
14 Why do we need generalized interpolation? Portability Interpolation of problem-dependent reactor data libraries needs to happen inline with ORIGEN Flexibility A more general approach to interpolation is warranted Allows for consideration of multiple reactor operating dimensions Offers a path forward for future fuel type interpolation
15 Old ORIGEN library format arpdata.txt Assembly1 Assembly2 Assembly3 lib1 lib4 lib1 lib4 lib1 lib4 lib2 lib5 lib2 lib5 lib2 lib5 lib3 lib6 lib3 lib6 lib3 lib6 Problem: Serious portability issues!
16 New self-describing ORIGEN library format lib1 lib2 lib3 Assembly1 lib4 lib5 lib6 TagManager TagManager type identifies two types of information: Descriptive tags: Strings that describe discrete libraries (e.g., assembly type, etc.) Interpolable tags: Floating point data used for CX interpolation (e.g., enrichment, burnup, void fraction, etc.) Consolidation of libraries from common assembly types into binary archives Key design goals: self-sufficiency and portability
17 Self-describing libraries become self-interpolating Assembly1 lib1 lib4 Interpolator Problem-dependent data lib2 lib5 TagManager PD-lib1 lib3 lib6 Problem-dependent library PD-lib2 PD-lib3 Self-contained problem-dependent interpolation capability
18 SCALE interpolation resources Developing a centralized SCALE interpolation resource API to be incorporated into the depletion engine Two approaches: Trilinos-based interpolation Analytical Numerical Algorithms (ANAs) developed by Sandia National Laboratory Advantages: Highly optimized; future ability to propagate crosssection uncertainties through interpolation In-house interpolation algorithms Advantages: Allows for optional dependence on outside packages
19 N-dimensional interpolation approach S u, v ci u c j v A i j A, i j 1. Determine adjacent 1-D knots for each dimension 2. Determine independent weight factors for each dimension 3. Apply appropriate weights to cross-section data across each dimension (u,v )
20 Depletion engine builder s library / API Basis of the NFIM; drives considerations of portability & self-containment A self-contained, portable resource other applications can build against directly to incorporate ORIGEN functionality Goal is a distributable ORIGEN-based depletion resource useful for supporting non- SCALE applications like the NFIM
21 Design requirements of builder s library 1. Downloadable directly from RSICC website 2. Includes appropriate API documentation while not disclosing source code 3. Installable resource self-extracting archive 4. Patchable via downloadable updates 5. Includes relevant ORIGEN data ORIGEN reactor data libraries Other cross-section & nuclear data
22 Development path for the NFIM Upcoming tasks to support the development of a suite of ORIGEN-based Cyclus facility modules
23 NFIM development roadmap Capability enhancements to ORIGEN for better fuel cycle analysis support Development of Nuclear Fuel Inventory Module (NFIM) for CYCLUS Implementation & testing of NFIM in CYCLUS
24 Schedule of NFIM development tasks FY2015 Q1: Complete & implement generalized interpolation Q2: Finalize depletion engine builder s library / API Q4: Develop Cyclus NFIM archetype FY2016 NFIM testing & benchmarking Advanced reactor data library development
25 Task status: Generalized interpolation Currently in final testing Remaining tasks Implement inline interpolation calls within ORIGEN reactor data library format Development of user input / control over interpolation in ORIGEN input
26 Task status: Depletion engine library / API Final requirements document being drafted Coordinating with SCALE development team to develop appropriate build Contingent upon finalization of generalized interpolation
27 Task status: NFIM Cyclus archetype Initial archetype design has begun ORIGEN-based functionality contingent upon depletion engine Other functions (i.e., Cyclus-facing interfaces) can begin immediately
28 Acknowledgements
29 UT/ORNL team UT Jennifer Littell (NFIM development) Nicholas Sly (Interpolation resources) Scott Richards (ORIGEN development) Nathan Shoman (Reactor library development) ORNL Will Wieselquist (ORIGEN technical lead) Andy Worrall (Fuel cycle analysis)
30 Questions?
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