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Announcement Code: 44399 (J20-TM-44399)
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International Workshop on the Safety of Multi-Unit Nuclear Power Plant Sites against External Natural Hazards
Anushakti Nagar, Mumbai, India
17-19 October Conference ID: 44399  (J20-TM-44399)

The number of sites housing multi-unit nuclear power plants (NPPs) and other co-located nuclear installations is increasing. An external event may generate one or more correlated hazards, or a combination of non-co-related hazards arising from different originating events, that can threaten the safety of NPPs and other nuclear installations. The safety assessment of a site with a single-unit NPP for external hazards is challenging enough, but the task becomes even more complex when the safety evaluation of a multi-unit site is to be carried out with respect to multiple hazards.

The impact of the Niigataken Chuetsu-oki (NCO) earthquake in July 2007 on the Kashiwazaki-Kariwa NPP highlighted the need for developing a methodology and detailed guidelines for the safety assessment of sites, especially those housing multi-unit NPPs and other nuclear installations, with regard to multiple correlated hazards generated by an external event (e.g. earthquake induced ground motion and fire). The Fukushima Daiichi nuclear accident caused by the Great East Japan Earthquake and Tsunami on 11 March 2011 underlined the importance of initiating a comprehensive range of activities related to the safety assessment of multi-unit sites for multiple hazards. The lessons learned from these accidents suggest that safety assessments should take into account multiple hazards and how they may affect multiple units on a site, as the case may be.

The currently available guidance material for the safety assessment of NPP sites in relation to external events is not comprehensive. The IAEA has not published safety standards in all the areas of this subject. For example, there exist well established methodologies for the evaluation of risk or safety margins against seismic ground motion hazards that are based on both deterministic (seismic margin assessment (SMA)) and probabilistic (seismic probabilistic safety assessment (SPSA)) approaches. For other external events, e.g. those caused by flooding (inundation, hydrodynamic forces and clogging), such a well-established methodology does not exist. This is also the case for combined effects of main shock, aftershocks and associated events following the main shocks of an earthquake. Site safety evaluation by combining the risk for multiple units and considering common cause failure under multiple hazards is another example of an area in which guidance is lacking.

It is in view of the above that activities aimed at developing detailed guidelines on site evaluation and safety assessment with respect to external events, with an emphasis on multi-unit sites, have been taken up in Work Area 8 (WA8) of the International Seismic Safety Centre s Extra budgetary Programme (ISSC-EBP). The information shared during the workshop will be utilized in the work being carried out under WA8.

The safety assessment of a multi-unit NPP site with regard to multiple external hazards is a complex task. In order to develop detailed guidelines and a methodology in this area, it is necessary to share the experience and ideas of the international nuclear community. The proposed International Workshop on the Safety of Multi-Unit Nuclear Power Plant Sites against External Natural Hazards will provide an appropriate platform to share such information.


The main objective of the workshop is to share information within the international nuclear community on the scientific and technical issues related to the safety of multi-unit NPP sites against external natural hazards that need to be addressed following the Fukushima Daiichi nuclear accident.

The workshop will also highlight the activities undertaken by the IAEA and its Member States to meet the challenge of ensuring the safety of multi-unit sites against multiple external hazards.


The workshop will cover the following main topics: lessons learned from past earthquakes affecting NPPs; assessment of external natural hazards at a site housing multi-unit NPP(s) and other nuclear installations; external event probabilistic safety analysis (EE-PSA); risk integration; and external event site safety assessment.


The workshop will consist of the following four sessions and two panel discussions (in addition to the opening and closing sessions):

Session 1: Natural Hazards affecting NPPs

- NCO earthquake and the Kashiwazaki-Kariwa NPP;
- Great East Japan Earthquake and Tsunami and the Fukushima Daiichi nuclear accident;
- Virginia earthquake and the North Anna NPP; and
- Other natural hazards affecting NPPs.

Panel Discussion 1: Lessons learned on safety of multi-unit site against natural hazards

Session 2: Member States’ activities relating to multi-unit site safety

- Presentations on Member States’ activities relating to the safety of multi-unit sites following the Fukushima Daiichi nuclear accident, and highlighting the analysis of defence-in-depth.
- This session will cover:
- hazard assessment;
- analysis of defence in depth;
- risk integration; and
- design margin assessment.

Panel Discussion 2: Issues related to multi-unit site safety

Session 3: Special Lectures

- Hazard assessment of a multi-unit site;
- Risk integration for the safety assessment of a site;
- IAEA activities in the area of safety assessment of multi-unit sites with respect to external events.

Session 4: Conclusions and Recommendations

- Discussions and preparation of final conclusions and recommendations.


Prospective participants should be high-level experts from regulatory authorities, utilities, technical support organizations, engineering and consultancy organizations, and academic and research and development (R&D) institutions who are actively involved in the topics to be covered by the workshop. Participants should be officially designated by their relevant governmental authority (Ministry of Foreign Affairs or National Atomic Energy Authority) and should send by fax or email the Participation Form to the Scientific Secretaries of the workshop by 3 August 2012. All participants should be designated through an established official channel as mentioned above.


The workshop is being organized by the IAEA in co-sponsorship with India’s Atomic Energy Regulatory Board and the Bhabha Atomic Research Centre.
The working language of the workshop will be English.

The host organizations are the Atomic Energy Regulatory Board and the Bhabha Atomic Research Centre. The organizing institutions have nominated the following committees and members:

Advisory Committee:

R. K. Sinha
Chairman, Atomic Energy Commission,
Department of Atomic Energy, Government of India, Mumbai, India

S. K. Bajaj
Chairman, Atomic Energy Regulatory Board,
Anushakti Nagar, Mumbai, India.

S. Basu
Director, Bhabha Atomic Research Centre, Mumbai, India

S. A. Bhardwaj
Director (Technical), Nuclear Power Corporation of India Limited, Anushakti Nagar, Mumbai, India

S. C. Chetal
Director, Indira Gandhi Centre for Atomic Research,
Kalpakkam, Tamil Nadu, India

IAEA Official
Senior Management Representative

Technical Directors:

Mr A.K.Ghosh
Director, Health, Safety and Environment Group
Bhabha Atomic Research Centre,
Trombay, MUMBAI 400085, INDIA
Tel. and fax: +91 22 25505313
Email: ccss@barc.gov.in

Mr L.R. Bishnoi
Head, Siting and Structural Engineering Division
Atomic Energy Regulatory Board
Niyamak Bhavan, Anushakti Nagar, MUMBAI 400094, INDIA
Tel.: +91-22-2556-3218
Fax: +91-22-2599-0450
Email: lrbishnoi@aerb.gov.in

Scientific Secretaries:

Mr Prabir C. Basu
International Seismic Safety Centre
Division of Nuclear Installation Safety
International Atomic Energy Agency
Email: P.Basu@iaea.org
Tel: +43-1-2600-26668
Fax: +43-1-26007

Mr Ayhan Altinyollar
International Seismic Safety Centre
Division of Nuclear Installation Safety
International Atomic Energy Agency
Email: A.Altinyollar@iaea.org
Tel: +43-1-2600-26399
Fax: +43-1-26007


The organizing institutions encourage participants to submit papers relating to the topics indicated for Sessions 2 as mentioned above.

Papers will be selected on the basis of review of abstracts. Participants requiring early confirmation of acceptance of their presentations are therefore encouraged to submit their abstracts as soon as possible. The abstracts should be submitted on an A4 size page not exceeding 500 words and should be sent electronically to the co-Scientific Secretary of the workshop, Mr Ayhan Altinyollar (Email: A.Altinyollar@iaea.org), not later than 15 August 2012. Authors will be notified of the acceptance of their papers by 31 August 2012.

Those authors whose papers are accepted should submit the original of their full-length papers to Mr Altinyollar not later than 30 September 2012. The abstract should be included on the first page of the paper.
The manuscript should be typed; single spaced on an A4 format or 8.5 by 11 in. paper in Times New Roman 10 or 12 point and should include original illustrations and black and white glossy prints of all photographs. The paper should be no more than 12 pages long (including illustrations). The author’s (authors’) name(s) should be given on the first page of the paper as follows:


By [name of first author]*, [name of second author]**, [name of third author]***
* Position and correspondence address
** Position and correspondence address
***Position and correspondence address


Based on abstract provided previously, but to include major conclusions.


Include a list of keywords at bottom of first page
In addition to the master (paper) copy, an electronic version of the paper is necessary to ensure quality and timely issuance of the proceedings, which are to be prepared and distributed in electronic form (CD-ROM). It is highly desirable to use an internationally used software programme (preferably Microsoft Word).


A working material document containing all presentations, including conclusions and recommendations, will be issued and distributed by the IAEA, not later than 6 months after the workshop.


The possibility of a technical visit to an NPP following the workshop, on 20 October 2012, is being explored.


- Workshop venue: Anushakti Nagar, Mumbai

The workshop will be held in the auditorium of India s Atomic Energy Regulatory Board (AERB). The office premises of the AERB are located in Niyamak Bhavan, in Anushakti Nagar, which is about 20 km from the Mumbai International Airport. Mumbai is expected to have a mean daily maximum temperature of around 32.9°C and a mean daily minimum temperature of 23.1°C, which means that it will be hot during the day and mild during the night.

- Workshop logistics and accommodation

The host organizations will arrange:

- Guesthouses and hotels - accommodation facilities in and near Anushakti Nagar.
- Airport pickup of participants - transportation: airport - venue - airport.

The host organizations will arrange the accommodation and airport pickup for the participants from the airport to the hotel or guesthouse subject to payment by the participants.
The participants should address their request for accommodation and airport pickup to:

Mr A.D. Roshan
Siting and Structural Engineering Division
Atomic Energy Regulatory Board
Niyamak Bhavan; Anushakti Nagar; MUMBAI 400094, INDIA
Tel: +91-22-2599-0452
Email: adroshan@aerb.gov.in


Participants who need a visa to enter India should complete and send, by email or fax, the Personal Data Form to the local host, (Mr A.K.Ghosh; Tel. & fax: +91 22 2550531; Email: ccss@barc.gov.in and Mr L. R. Bishonoi; Tel.: +91-22-2556-3218; Fax: +91-22-2599-0450; Email: lrbishnoi@aerb.gov.in) with a copy to Scientific Secretaries of the workshop (Mr Ayhan Altinyollar; A.Altinyollar@iaea.org) for arranging the invitation letter to be sent by the local host (as required for obtaining a visa to India) before 3 August 2012. The Scientific Secretaries will send an invitation letter from the IAEA if so requested.


The organizational cost of the workshop is borne by the host organizations. The IAEA is not in a position to bear the travel and other costs for designated participants in the workshop. However, limited funds are available to help cover the cost of participants from Member States eligible to receive technical assistance under the ISSC-EBP or under the IAEA s technical cooperation programme. Such assistance can be offered, upon specific request through official channels, to one participant per country provided that, in the IAEA s view, this participant will make an important contribution to the workshop. The application for financial support should be made at the time of nominating the participant


Please visit the following web page regularly for new information regarding this workshop:


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