ML22166A039
| ML22166A039 | |
| Person / Time | |
|---|---|
| Issue date: | 06/21/2022 |
| From: | Louise Lund NRC/RES/DE |
| To: | Beverly Smith NRC/NRR/DNRL |
| Nove C | |
| Shared Package | |
| ML22166A037 | List: |
| References | |
| NRR-2020-002, PNNL-32908 | |
| Download: ML22166A039 (3) | |
Text
June 21, 2022 MEMORANDUM TO: Brian Smith, Director Division of New and Renewed Licenses Office of Nuclear Reactor Regulation McKirgan, John signing on behalf FROM: Louise Lund, Director of Lund, Louise on 06/21/22 Division of Engineering Office of Nuclear Regulatory Research
SUBJECT:
IMPENDING PUBLICATION OF TECHNICAL LETTER REPORT ENTITLED GUIDANCE FOR PERFORMING PROBABILITY OF DETECTION ANALYSIS FOR NUCLEAR POWER COMPONENT INSPECTIONS (PNNL-32908) (UNR NRR- 2020-002)
The Office of Nuclear Regulatory Research (RES) has completed a Technical Letter Report (TLR) entitled Guidance for Performing Probability of Detection Analysis for Nuclear Power Component Inspections, (ADAMS Accession ML22166A038) under contract with Pacific Northwest National Laboratory (PNNL). This TLR documents work performed under User Need Request (UNR) NRR-2020-002, Update of the User Need Request for Evaluating the Reliability of Nondestructive Examinations of Vessels and Piping. This UNR focused on assessing the reliability and effectiveness of nondestructive examination methods used in nuclear power plants. Task 9 on International Collaboration enabled RES to leverage resources by collaborating with international regulators and inspection bodies on technical areas covered by the technical tasks in the UNR.
This TLR provides technical guidance for probability of detection (POD) analysis for nuclear power plant (NPP) components and documents the results of an international virtual round robin study utilizing data generated by the virtual flaw method. The TLR was prepared as part of an ongoing international research collaboration for topics related to nondestructive examination (NDE) in commercial NPPs called the Program for Investigation of NDE by International Collaboration (PIONIC). Organizations from the U.S., Finland, Japan, Sweden, South Korea, and Switzerland, participated in this effort.
The primary objectives of the effort were to assess capabilities and limitations of POD models for use in probabilistic fracture mechanics codes such as xLPR and to summarize guidance and recommendations for conducting POD analyses. A general conclusion of this effort is that estimating POD for NPP components is complex and that there is not a one-size-fits-all approach. The best approach will depend on the characteristics of the available datasets and the intended application for the POD data.
CONTACT: Carol Nove, RES/DE/MEB 301 415-2217
B. Smith Staff representatives from the Division of New and Renewed Licenses in the Office of Nuclear Reactor Regulation (NRR) reviewed a draft of this TLR and stated, The NRR staff agrees with the conclusions of the report and the key findings. The TLR is of high quality and is a good report on the research. The TLR contains sufficient detail and rigor to be used as a reference in evaluating probabilistic calculations and in xLPR.
RES has established an online quality survey to collect feedback from user offices on the usefulness of RES products and services. This survey can be found online at the hyperlink:
RES Quality Survey. I would appreciate the responsible manager or supervisor completing this short survey within the next 10 working days to present your offices views of the delivered RES product.
Enclosure:
Technical letter report (TLR) entitled guidance for Performing Probability of Detection Analysis for Nuclear Power Component Inspections
ML22166A037; ML22166A039 OFFICE RES/DE/CIB RES/DE/CMB RES/DE LLund NAME CNove CN MHiser MH JMcKirgan for JM DATE Jun 17, 2022 Jun 21, 2022 Jun 21, 2022