Neda Stoeva Division of Nuclear Installation
Description: Neda Stoeva Division of Nuclear Installation Safety External Events Safety Section International Atomic Energy Agency Revision of NS-G-3.6 Geotechnical Aspects in Siting and Design of Nuclear Installations (DS531) Step 11 58th Meeting of
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slide1. Neda Stoeva
Division of Nuclear Installation Safety
External Events Safety Section
International Atomic Energy Agency Revision of NS-G-3.6 Geotechnical Aspects in Siting and Design of Nuclear Installations (DS531) – Step 11 58th Meeting of the Nuclear Safety Standards Committee (NUSSC)
19-21 November 2024<br>
slide2. Background IAEA Safety Guide NS-G-3.6 was published in 2004 and has not yet been revised.
DS531 is a full revision of Safety Guide NS-G-3.6 and aims to:
Align the recommendations with:
GSR Part 2, Leadership and Management for Safety (2016)
SSR-1, Site Evaluation for Nuclear Installations (2019)
SSR-2/1 (Rev. 1), Safety of Nuclear Power Plants: Design (2016)
SSR-3, Safety of Research Reactors (2016)
SSR-4, Safety of Nuclear Fuel Cycle Facilities (2017)
Expand the scope from Nuclear Power Plants to Nuclear Installations
Incorporate lessons learned from significant geotechnical events
Reflect current practices related to evaluation approaches, methodologies, and assessment techniques in Member States<br>
slide3. Overview of the Document (1/2) TITLE of the Safety Guide
NS-G-3.6: Geotechnical Aspects of Site Evaluation and Foundations for Nuclear Power Plants
DPP DS531 proposed: Site Geotechnical Aspects for Design Basis of Nuclear Installations
Draft DS531: Geotechnical Aspects in Siting and Design of Nuclear Installations
Language considerations
Draft DS531 language is consistent with IAEA Glossary & current IAEA Safety Standards
Geotechnical aspects refer to the aspects of geotechnical site investigation, evaluation, engineering design and safety assessment related to the subsurface materials at nuclear installation sites
Expanding text to close gaps
Applicability of collected data and geotechnical parameters to evaluations for beyond design basis events & cliff-edge effects considerations
Section 2 has been updated to reflect current practices and expectations related to site investigations, geotechnical data collection and other considerations
Section 3 now focuses on Geotechnical Hazards (Major update of section on Liquefaction)
Section 4 now focuses on Geotechnical considerations for Design and Evaluation
Monitoring, graded approach and application of management system (Sections 5, 6 & 7)<br>
slide4. Overview of the Document (2/2) This Safety Guide provides recommendations related to the geotechnical engineering aspects that are important to the safety of nuclear installations
Site investigation planning
Evaluation of geotechnical hazards
Considerations for design and analyses
Monitoring of geotechnical parameters
Application of a graded approach for nuclear installations with limited risk
Revision Updates:
Consistency with most current Safety Standards
Incorporation of latest knowledge and experience
Incorporation of Lessons Learned from significant events
Expansion of scope from NPPs to Nuclear Installations
Restructuring into categories: Investigation, Hazards, Design
Other changes:
References updated<br>
slide5. Status of the Document The DPP of DS531 was prepared in January 2021, approved by NUSSC in June 2021, and approved by CSS in November 2021.
The first draft was developed in 3 consultancy meetings (2 virtual and 1 in-person)in 2021 and 2022.
The draft document (Step 7) was approved by WASSC and NUSSC in November 2023.
The document was posted on the IAEA website for Member States’ comments on 15 December 2023.
Submission to the Committees after resolution of MS comments in August 2024.
Comments were received from 1 WASSC Member and 7 NUSSC Members, including international organizations.
The table with proposed resolutions was posted on the NUSSC website on 21 October 2024.
WASSC approved DS531 for submission to CSS on 30 October 2024.
Current step: Request for approval by NUSSC to proceed to CSS review and Step 12.<br>
slide6. Member States Comments: Summary Total number of
MS Comments
330<br>
slide7. Member States Comments: Summary Section 1 Introduction
Section 2 Geotechnical site investigations, geotechnical data collection and other considerations
Section 3 Geotechnical Hazards
Section 4 Geotechnical considerations for Design and Evaluation
Section 5 Monitoring
Section 6 Graded approach
Section 7 Management system<br>
slide8. Member States Comments: Resolution Table 330 MS Comments
109 Accepted
107 Accepted with Modification
114 Rejected<br>
slide9. SSC Member Comments: Summary and Resolutions WASSC – 2 comments from 1 representative
2 Rejected
NUSSC – 23 comments from 7 representatives
6 Accepted 11 Modified
6 Rejected<br>
slide10. SSC Member Comments: High Interest Multiple comments were received by Member States and by SSC Members related to the title and approach presented in Section 6
Section 6 covers the Application of a Graded Approach
The current text presents an approach which recommends a categorization of sites for nuclear installations based on radiological consequences of release – consistent other Safety Standards
As a result of the resolution of the comments the title of Section 6, the subsection on categorization and the title of Table 5 are now:
6. APPLYING A GRADED APPROACH TO GEOTECHNICAL ASPECTS IN SITING AND DESIGN OF NUCLEAR INSTALLATIONS
CATEGORIZATION OF SITES FOR NUCLEAR INSTALLATIONS IN ACCORDANCE WITH THE RADIOLOGICAL HAZARD AS RELEVANT TO GEOTECHNICAL ASPECTS
TABLE 5. CATEGORIES OF NUCLEAR INSTALLATIONS BASED ON THE POTENTIAL RADIOLOGICAL CONSEQUENCES AS RELEVANT TO GEOTECHNICAL ASPECTS
The intent of the approach is to categorize the nuclear installation as a High, Medium, Low or Conventional hazard installation and then to apply the same categorization to the site and the relevant geotechnical aspects<br>
slide11. SSC Member Comments: Summary Twenty-five (25) comments from WASSC and NUSSC
The comments were mainly editorial, for clarification, consistent use of terminology, and improved coherency with the other relevant IAEA Safety Standards
A few comments related to expansion of scope and level of detail presented were rejected, but will be noted for future revisions consideration
All comments were addressed and resolutions were provided
The updated document and comment resolution tables have been shared, and no objections have been received.<br>
slide12. Action Requested Approval by NUSSC to proceed to submission to CSS review and Step 12.<br>
slide13. Neda Stoeva
n.stoeva@iaea.org THANK YOU<br>
Division of Nuclear Installation Safety
External Events Safety Section
International Atomic Energy Agency Revision of NS-G-3.6 Geotechnical Aspects in Siting and Design of Nuclear Installations (DS531) – Step 11 58th Meeting of the Nuclear Safety Standards Committee (NUSSC)
19-21 November 2024<br>
slide2. Background IAEA Safety Guide NS-G-3.6 was published in 2004 and has not yet been revised.
DS531 is a full revision of Safety Guide NS-G-3.6 and aims to:
Align the recommendations with:
GSR Part 2, Leadership and Management for Safety (2016)
SSR-1, Site Evaluation for Nuclear Installations (2019)
SSR-2/1 (Rev. 1), Safety of Nuclear Power Plants: Design (2016)
SSR-3, Safety of Research Reactors (2016)
SSR-4, Safety of Nuclear Fuel Cycle Facilities (2017)
Expand the scope from Nuclear Power Plants to Nuclear Installations
Incorporate lessons learned from significant geotechnical events
Reflect current practices related to evaluation approaches, methodologies, and assessment techniques in Member States<br>
slide3. Overview of the Document (1/2) TITLE of the Safety Guide
NS-G-3.6: Geotechnical Aspects of Site Evaluation and Foundations for Nuclear Power Plants
DPP DS531 proposed: Site Geotechnical Aspects for Design Basis of Nuclear Installations
Draft DS531: Geotechnical Aspects in Siting and Design of Nuclear Installations
Language considerations
Draft DS531 language is consistent with IAEA Glossary & current IAEA Safety Standards
Geotechnical aspects refer to the aspects of geotechnical site investigation, evaluation, engineering design and safety assessment related to the subsurface materials at nuclear installation sites
Expanding text to close gaps
Applicability of collected data and geotechnical parameters to evaluations for beyond design basis events & cliff-edge effects considerations
Section 2 has been updated to reflect current practices and expectations related to site investigations, geotechnical data collection and other considerations
Section 3 now focuses on Geotechnical Hazards (Major update of section on Liquefaction)
Section 4 now focuses on Geotechnical considerations for Design and Evaluation
Monitoring, graded approach and application of management system (Sections 5, 6 & 7)<br>
slide4. Overview of the Document (2/2) This Safety Guide provides recommendations related to the geotechnical engineering aspects that are important to the safety of nuclear installations
Site investigation planning
Evaluation of geotechnical hazards
Considerations for design and analyses
Monitoring of geotechnical parameters
Application of a graded approach for nuclear installations with limited risk
Revision Updates:
Consistency with most current Safety Standards
Incorporation of latest knowledge and experience
Incorporation of Lessons Learned from significant events
Expansion of scope from NPPs to Nuclear Installations
Restructuring into categories: Investigation, Hazards, Design
Other changes:
References updated<br>
slide5. Status of the Document The DPP of DS531 was prepared in January 2021, approved by NUSSC in June 2021, and approved by CSS in November 2021.
The first draft was developed in 3 consultancy meetings (2 virtual and 1 in-person)in 2021 and 2022.
The draft document (Step 7) was approved by WASSC and NUSSC in November 2023.
The document was posted on the IAEA website for Member States’ comments on 15 December 2023.
Submission to the Committees after resolution of MS comments in August 2024.
Comments were received from 1 WASSC Member and 7 NUSSC Members, including international organizations.
The table with proposed resolutions was posted on the NUSSC website on 21 October 2024.
WASSC approved DS531 for submission to CSS on 30 October 2024.
Current step: Request for approval by NUSSC to proceed to CSS review and Step 12.<br>
slide6. Member States Comments: Summary Total number of
MS Comments
330<br>
slide7. Member States Comments: Summary Section 1 Introduction
Section 2 Geotechnical site investigations, geotechnical data collection and other considerations
Section 3 Geotechnical Hazards
Section 4 Geotechnical considerations for Design and Evaluation
Section 5 Monitoring
Section 6 Graded approach
Section 7 Management system<br>
slide8. Member States Comments: Resolution Table 330 MS Comments
109 Accepted
107 Accepted with Modification
114 Rejected<br>
slide9. SSC Member Comments: Summary and Resolutions WASSC – 2 comments from 1 representative
2 Rejected
NUSSC – 23 comments from 7 representatives
6 Accepted 11 Modified
6 Rejected<br>
slide10. SSC Member Comments: High Interest Multiple comments were received by Member States and by SSC Members related to the title and approach presented in Section 6
Section 6 covers the Application of a Graded Approach
The current text presents an approach which recommends a categorization of sites for nuclear installations based on radiological consequences of release – consistent other Safety Standards
As a result of the resolution of the comments the title of Section 6, the subsection on categorization and the title of Table 5 are now:
6. APPLYING A GRADED APPROACH TO GEOTECHNICAL ASPECTS IN SITING AND DESIGN OF NUCLEAR INSTALLATIONS
CATEGORIZATION OF SITES FOR NUCLEAR INSTALLATIONS IN ACCORDANCE WITH THE RADIOLOGICAL HAZARD AS RELEVANT TO GEOTECHNICAL ASPECTS
TABLE 5. CATEGORIES OF NUCLEAR INSTALLATIONS BASED ON THE POTENTIAL RADIOLOGICAL CONSEQUENCES AS RELEVANT TO GEOTECHNICAL ASPECTS
The intent of the approach is to categorize the nuclear installation as a High, Medium, Low or Conventional hazard installation and then to apply the same categorization to the site and the relevant geotechnical aspects<br>
slide11. SSC Member Comments: Summary Twenty-five (25) comments from WASSC and NUSSC
The comments were mainly editorial, for clarification, consistent use of terminology, and improved coherency with the other relevant IAEA Safety Standards
A few comments related to expansion of scope and level of detail presented were rejected, but will be noted for future revisions consideration
All comments were addressed and resolutions were provided
The updated document and comment resolution tables have been shared, and no objections have been received.<br>
slide12. Action Requested Approval by NUSSC to proceed to submission to CSS review and Step 12.<br>
slide13. Neda Stoeva
n.stoeva@iaea.org THANK YOU<br>