World meteorological organization

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expert team on emergency response activitIes (et-era)


CBS-DPFS/ET-ERA/Doc. 4.9(1)


Agenda item : 4.9


Revision of WMO Technical Note 170: Meteorological and Hydrological Aspects of Siting and Operations of Nuclear Power Plants
(Submitted by the Chair)

Summary and purpose of document

This document presents a short status report on the work done on the revision of WMO Technical Note No. 170 since the last meeting of the ET-ERA in October 2013.

Action proposed
The meeting is invited to 1) Note and discuss the information presented in this paper and 2) participate in the review of the Technical Note No. 170.

1. Background
The review of WMO Technical Note No. 170: Meteorological and Hydrological Aspects of Siting and Operations of Nuclear Power Plants started in 2013 following a request by WMO Congress 16. The review is needed for the following reasons:
1- The current version dates back to 1985 and is out-dated (See Volume I: Meteorological Aspects and Volume II: Hydrological Aspects);


2- A desire to have a close correspondence between TN-170 and IAEA's Specific Safety Guide No. SSG-18 (Meteorological and Hydrological Hazards in Site Evaluation for Nuclear Installations), a document jointly sponsored by the IAEA and WMO.


Quoting from the preface in SSG-18: 'This document is intended to assist Members States in meeting the requirements for nuclear installations established in the IAEA Safety Requirements Publication on Site Evaluation for Nuclear Installations (No. NS-R-3) in respect of the assessment of meteorological and hydrological hazards'.


The difference between SSG-18 and TN-170 is that SSG-18 identifies in general terms the meteorological and hydrological parameters that must be taken into account; TN-170 is a counterpart document that addresses the technical aspects on how to do this. This explains why the chapters in the document plan for the revised TN-170 follow closely those of SSG-18. 

2. Work done since the last ET-ERA meeting
- Document on the status and way forward for the revision of TN No. 170 submitted to the WMO Secretariat (Chair ET-ERA; June 2014)
- Second consolidated draft document based on contributions from TT members (Chair ET-ERA; June 2014)
- Work on new and updated contributions by TT members (ongoing since November 2014)
- Task Team Teleconferences in November 2014, July, August and October 2015
- Third consolidated draft document based on contributions from TT members (Chair ET-ERA; October 2015)

3. Next steps
- Fourth consolidated draft document (November 2015)
- Review by TT members and final consolidated draft (December 2015).

Action: The document will be distributed to the ET-ERA for review and comments
- Review by other experts (January – February 2016)
- Updating and completion of document (by May 2016)
- CBS (Fall 2016)

4. Document Plan (October 2015 version)
1. Background Objectives
2. Structure of the document and organizational roles
3. Necessary Information – meteorological and hydrological assessment
3.1 Generic specifications: which variables, temporal and spatial

3.1.1 Introduction

3.1.2 Meteorological Assessment

3.1.3 Hydrological Assessment

3.2 Observations

3.2.1 General considerations

3.2.2 Meteorological

3.2.3 Hydrological (Hydrometeorological) Observations

3.3 Data Analysis
Meteorological and climatological

3.3.1 General procedure for assessing meteorological hazards

3.3.2 Rarely occurring hazardous meteorological phenomena

3.3.3 Statistical methods for analyzing climatological datasets

Hydrological (hydrometeorological)

3.3.1 Methods of analysis Hydrological data Coastal storm surges

3.3.2 Extreme value analysis

3.3.3 Probable Maximum Precipitation (PMP) and Probable Maximum Flood (PMF)

3.3.4 Hydrological studies to support model development

3.3.5 Studies to support surge model development

3.4 Meteorological (NWP) Analysis (what’s available, global, down-scaled to regional scale, parameters that are useful for data analysis and limitations)
3.5 Climate prediction and projection

3.5.1 Climate predictions

3.5.2 Climate projections
3.6 Estimating uncertainties
3.7 Climatological products
3.8 Sources (and access) of relevant meteorological and hydrological information and products
3.9 Communication of information
3.10 Periodic review and update
4. Assessment of Meteorological Hazards
General considerations
4.1 Extreme meteorological phenomena (air temp, wind speed, precip, snowpack)
4.2 Rare meteorological phenomena (lightning, TC, tornadoes, waterspout, precip/PMP)
4.3 Other meteorological phenomena (dust storm, hail, freezing precip and frost)
4.4 Transport, dispersion and deposition of airborne radioactivity (new to SSG-18)

4.4.1 Introduction

4.4.2 Basics of atmospheric transport and dispersion

4.4.3 Dispersion models

4.4.4 Source term estimation

Annex 4.4: Atmospheric transport, dispersion and deposition

5. Assessment of hydrological Hazards
5.1 Extreme flood events
5.2 Rare flood events

5.2.1 Probable maximum flood (PMF)

5.2.2 Dam break

5.2.3 Tsunami

5.3 Low flow risk
5.4 High ground water levels
5.5 Water contamination
5.6 Flooding from tropical cyclones
6. Design Basis Parameters
6.1 Meteorological
6.2 Hydrological (floods)
6.3 Software solutions
7. Measures for Site Protection – generalized response, related to mitigation by suitable infrastructure against identified hazards, as per SSG-18
8. Changes in Hazards with Time
8.1 Climate Change and Hazards

8.1.1 Synthesis of recent IPCC findings

8.1.2 Tropical cyclones and storm surges
8.2 Other changes
9. Monitoring, Forecasting, and Warning Systems for the Protection of Installations
9.1 Meteorological monitoring

9.2 Meteorological forecasts and warnings

9.3 Hydrological monitoring

9.4 Hydrological forecasts and warnings
9.5 Operational support for emergency response and atmospheric dispersion
10. Conclusion

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