International Code Assessment and Applications Program: Summary of code assessment studies concerning RELAP5/MOD2, RELAP5/MOD3, and TRAC-B. International Agreement Report

Schultz, Richard R.

doi:10.2172/10112290

Cited by 5 publications

(2 citation statements)

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“…From the perspective of developing and applying thermal-hydraulic and reactivity-specific models to reactor systems, Regulatory Guideline 1.203 15 (RG1.203) gives key guidance to numeric model developers and those tasked with the validation of numeric models. RG1.203 was only released 7 years ago and was derived on the basis of work accomplished to create an analysis tool deemed adequate to analyze the behavior of Generation III+ light water reactors (LWRs) 16,17 . The INL played a lead role in developing this guide by applying it to the validation of AP600 models using data derived from the Oregon State University APEX facility.…”

Section: An Historical Perspective Of Nuclear Plant Verification and mentioning

confidence: 99%

Verification and Validation Strategy for LWRS Tools

Stoots¹,

Schultz²,

Gougar³

et al. 2012

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SUMMARYThe US Department of Energy Light Water Reactor Sustainability (LWRS) Program is focused on enabling the long-term operation of US commercial power plants. Commercial power plant owners will make the decisions on life extension -the information provided by the research and development activities in the LWRS Program will reduce the uncertainty (and therefore the risk) associated with making those decisions.Modeling and simulation activities are an important part of the LWRS Program. Advanced tools that represent more accurately (when compared with currently used tools) the behavior of nuclear power plants, in particular as they age, can be an important tool to inform life extension decisions, and could potentially be used in licensing activities. However, before these tools can be used to inform decisions or support licensing activities, they will need to be adequately verified and validated (V&V'ed). The acceptable level of V&V is ultimately the decision of the nuclear power plant owners (who would use the tools to inform life-extension decisions) and the NRC (if the tools are used to support licensing). Although this report is focused on the LWRS Program, it is broadly applicable to advanced modeling and simulation activities.Significant and continuing advances in computer simulation and rising costs of building and conducting test facilities are increasing the reliance on complex models in licensing facilities, optimizing designs, improving performance, and understanding the underlying science. At the same time, however, the complexity of these models and associated computational methods present unprecedented challenges for code verification, validation, and uncertainty quantification (VVUQ).In general, the VVUQ Strategy should:1. Be driven by the needs of the users (for this program, the LWR industry) 2. Distinguish between and address the needs of licensing, design and performance, and aging/life extension 3. Demonstrate the effectiveness of the methodology by executing one or more well-defined problems early in the process to establish good practices and instill confidence within the user community 4. Utilize a rigorous and integrated approach to code development and VVUQ that is accepted by industry (to inform life-extension decisions) and regulators (if the tools are used to support licensing) 5. Recognize the complementary nature of system and multiphysics/multiscale codes, addressing the unique challenges in VVUQ including gaps in understanding (physical models) and coupling of phenomena across physics, time and length scales 6. Acknowledge and identify gaps in data and re-establish the pedigree of legacy data, exploiting it in a cost-effective manner.iv v CONTENTS

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Section: An Historical Perspective Of Nuclear Plant Verification and mentioning

confidence: 99%

Verification and Validation Strategy for LWRS Tools

Stoots¹,

Schultz²,

Gougar³

et al. 2012

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show abstract

“…A more rigorous definition is given by Schultz (1993). A code is considered adequate in applicability when it shows either excellent or reasonable agreement with the highly ranked phenomena (sometimes identified as the dominant phenomena) for a transient of interest.…”

Section: Validationmentioning

confidence: 99%