Some Ideas For Metrology to Extend Capability and Attract Investors and Users from Methods Development Communities

Art Ruggles, UTNE

Lin 11-Mar-09

Void Distribution and Fluid Mixing Measurements, Time Averaged.

• Radiograpy in 2-D, Fixed Source and Detector• Radiograpgy in 3-D, Rotating Source and Detector.• Radiography in 3-D, Central Sources and Rotating

Detector.• PET Tracers injected in flow, Mixing studies and

additional Void Distribution Data, Rotating detector array.

• These are additional to more conventional void pressure and temperature measurements.

• Time resolved data would also be nice.

Lin 11-Mar-09

Why Attempt Separate Effects Measurements in Integral Bundle Tests?

• Enlarge Tent to Include Methods Development community (multiphysics simulation and CFD), with more government support.

• Moves CHF testing toward separate effects testing to support more mechanistic modeling basis.

• Offers larger suite of technology and activities for education and research during off-test periods.

• Can be promoted without risk to “primary” fuel thermal limit test mission.

• Gives Facility New Features and Forward Looking Value (not a resurrection of old testing infrastructure.)

Lin 11-Mar-09

OECD-NEA Benchmark Data, BFBT 2005

15 second average gamma count data for pixel level void topology. Conventional 1-DSubchannel methods can be refined to 3-D CFD.Facility by JNES. US NRC participated.

CT Pixel

Subchannel

Lin 11-Mar-09

Quick Look at BFBT facility.

Lin 11-Mar-09

BFBT Benchmark Simulation ResultsTest 4101-61, Exit Quality = 25%Baseline

Predicted void fraction

Measured void fraction

Predicted void fraction

Percent Error

MicroscopicDistribution

Channel Averages

ICONE 17-Tentner and Pointer ANL and CD-Adapco, 2009

This is state of theart for CFD V & V.

Lin 11-Mar-09

Bigger Tent-Modeling V&V

• NEAMS-nuclear energy advanced modeling and simulation workshop in May at ANL- AFCI and Gen IV focus may change.

• NRC-INL (Shultz) proposing to formalize CFD V&V so these tools can reliably be used for NRC licensing, expects extensive experimental campaign with protocols for experiment design and code use for simulation of outcomes.

• Vendors are already using CFD for design, test planning, and to help resolve fuel performance issues. NRC needs to be on board with these methods.

Lin 11-Mar-09

Vendor CHF Mission Leverage

• Void, Flow Distribution, and Diffusivity Data Leverage CHF model development

• Full bundle flow enthalpy and void data allow Cross Flow term quantification.

• Move CHF models from algebraic representations of data (W-3), or tabulations (Groeneveld), to 3-D physics based simulations.

Lin 11-Mar-09

Education and Facility Utilization

• NRC has supported education initiatives, Vendors also need qualified fuel performance engineers.

• A “standard” test section for educational and regulatory missions can fill in-between vendor test campaigns.

• Universities may also use facility (user facility) for other funded research, including instrumentation and methods development research.

Lin 11-Mar-09

No Risk,… well almost no risk

• Vendors are primary customer, They bring their own test sections and may develop their own methods.

• Methods that may activate materials will need to be carefully planned and controlled (test review panel).

• Test spool pieces may be modular to support methods that are advantaged by certain material properties (low Z or low neutron cross section).

Lin 11-Mar-09

The History of Fuel Performance Simulation-Predicting the Future

• Early algebraic models based on Test Data with sparse bundle integral information.

• Mechanistic Models• CFD (Fluid Centered Models) requiring more detail on

velocity and void profiles, and flow dynamics.• Multiphysics Models (Thermal, Fluid, Structural) which

require very dense time coincident data fields for verification.

• Direct Numerical Simulations, which require very very dense time coincident data fields for verification.

• Each level of simulation more closely approaches a level of complexity identical to the real system.

Lin 11-Mar-09

Value Added, Forward Looking Instrumentation Suite

Needs Engineering Development Investment,perfect for leveraging research and educationmissions of facility.

Lin 11-Mar-09

HPLC Injection of PET Isotope,1cc/min.

Turbulent MixingPlume Downstream ofSpacer Grid from PETImage.

Rod Bundle is the “Patient” for PET Imaging, Data areUseful For Method Validation. May beUseful in Single andTwo Phase Flows

Lin 11-Mar-09

Incident N Beam fromCyclotron

Neutron Producing Targets in Fuel Simulator Bundle can make 3-D Imaging Practical