1. Validation of Advanced Modeling and Simulation: an Imperative
Welcome and Opening:
Validation of Advanced Modeling and Simulation: an Imperative
Multiphysics Model Validation Workshop
NCSU, Raleigh
June 27-29, 2017
Lisa Marshall, Nuclear Engineering,

2. Outline Introduction to NCSU’s Nuclear Engineering Department (NED)
Multi-Physics Model Validation
Objective and Goals of the Workshop
Conclusions

3. NED /NCSU
Historically the first Nuclear Engineering (NE) program with first university reactor in USA
Currently the largest stand-alone NE department with research reactor in South-East USA
Nineteen tenured/tenure-track, three research, and one teaching faculty
Two open faculty positions for next years
Four Distinguished and Endowed Professorships plus two Distinguished Alumni Graduate Professors
Four Joint Faculty Appointments (JFAs) with ORNL, and one JFA with INL
Student enrollments: currently about graduate, and 160 undergraduate students

4. Research Nuclear power
Three major thrust areas:
Nuclear power
Radiation applications & radiological engineering
Plasma science & engineering
Cross-cutting areas – Applications in major thrust areas:
Nuclear materials
Nuclear computational science
Research facilities, consortia and centers
NRP’s 1MW PULSTAR & experimental stations (uprated to 2MW) and NRP Center
Consortium for Advanced Simulation of LWRs (CASL)
Consortium for Nonproliferation Enabling Capabilities (CNEC)
Consortium for Engineering Applications of Radioisotopes (CEAR)
Participation in the Center for Critical Infrastructure Protection and Facility Decommissioning (CNEFS)
Recently established the Consortium for Nuclear Power (CNP) on the basis of Reactor Dynamics and Fuel Modeling Group (RDFMG) and CTF User’s Group

5. Mission of CNP
The mission of CNP is to promote research and development, innovation, education, and training as well as provision of technical support/expert advice/consultancy services that benefit the nuclear industry and its regulation.
Consortium will accomplish this through:
Collaborative research;
Membership of Software Nuclear Power related Software User’s Groups including CTF UG;
Computational and Experimental tools development and application;
Education, training, and information dissemination;
Sharing resources with the scientific community and stakeholders;
Engaging the general public, policy makers and stakeholder.

6. Goals of CNP CNP’s major scientific goals are to:
Increase research output;
Attract new sources of funding;
Address grand challenges including validation of advanced modeling and simulation;
Find and develop new collaborations;
Develop new and novel areas of research;
Become an internationally recognized entity for partnership;
Increase outreach and public awareness;
Provide excellence in education, mentoring and training;
Manage the software UGs such as : CTF UG (core thermal-hydraulic simulator), Core design and fuel cycle optimization Software UG, HTGR UG, V&V and UQ Software UG, Nodal Simulator UG, etc.

7. NCSU Involvement in Multi-Physics Validation
The NCSU faculty, which have been involved in national and international multi-physics code validation projects:
Dave Kropaczek: Chief Scientist of CASL;
Nam Dihn: Involved in the V&V focus area of CASL .
Leadership of International Programs:
K. Ivanov and M. Avramova – Coordinators of OECD/NEA LWR UAM benchmark;
K. Ivanov and J. Hou – Coordinators of OECD/NEA C5- G7-TD benchmark;
M. Avramova and K. Ivanov – Members of OECD/NEA Expert Group on Multi-Physics Experimental Data, Benchmarks and Validation (MPEBV);
K. Ivanov – Coordinator of IAEA CRP on HTGR UAM;
M. Avramova - Coordinator of CTF User’s Group.
Previous Experience:
OECD/NRC PWR MSLB, OECD/NRC BWR TT, OECD/CEA/DOE V1000 CT, and OECD Kalinin-3 coupled code benchmarks;
OECD/NRC BFBT and PSBT benchmarks.

8. Multi-Physics Model Validation
Advanced reactor modeling and simulation capabilities are being developed that couple multiple physics phenomena with the following validation challenges:
Consistent multi-physics validation path from single- to two-, … and to n- physics validation;
Complexity and high fidelity of these new computational tools;
Using new types of experiments - validation experiments.
Validation hierarchy

9. Concept for Multi-Physics Model Validation
Design and utilization of validation experiments

10. Objective and Goals of the Workshop
The meeting objective is to bring together researchers from academia, industry and government to discuss emerging needs, technical challenges, and opportunities for R&D and collaboration on validation and uncertainty quantification of multi-physics models in nuclear reactor and nuclear energy applications.
The meeting is organized by the NCSU’s Department of Nuclear Engineering, with support from the Idaho National Laboratory through its National University Consortium (INL-NUC) program and Nuclear Energy Knowledge and Validation Center (NEKVAC ) program.
This workshop will provide participants with understanding and knowledge of state-of-the-art concepts, principles, procedures, and challenges for validation of traditional, and novel multi-physics modeling and simulation tools.
Mixtures of lectures, presentations, panel discussions, and posters.
Summary of the workshop will be prepared and distributed among the participants.

11. Conclusions
The traditional multi-physics calculations are being used in industry and regulation for routine design and safety evaluations.
In parallel, the currently on-going projects worldwide in the area of advanced modeling and simulation aim at delivering to the corresponding stakeholders an advanced and reliable software capacity usable for design and safety analysis needs of present and future nuclear reactors.
The multi-physics coupling is being successfully extended to include detail fuel modeling in reactor cores.
While there are some existing procedures and guidelines for traditional multi- physics validation (OECD/NEA EGUAM activities) there is a need for implementing validation processes for novel methods (OECD/NEA EGMPEBV activities).
Uncertainty and sensitivity analysis methods need to be considered as an integral part in the development of multi-physics methods.
Comprehensive benchmark framework is being developed to verify/validate sensitivity and uncertainty analysis methods for multi-physics applications.