World Association of Nuclear Operators

The World Association of Nuclear Operators (WANO) is an international nonprofit organization formed by commercial nuclear power plant owners and operators. It was established on 15 May 1989, in the aftermath of the 1986 Chernobyl accident, when nuclear operators recognized that greater international cooperation and more systematic sharing of operational experience were needed to prevent similar events. Rather than functioning as a regulator, utility, reactor vendor, or political body, WANO provides a confidential, operator-to-operator framework for assessing performance, exchanging lessons, benchmarking results, and supporting continuous improvement. WANO's central mission is to maximize the safety and reliability of commercial nuclear power plants worldwide. Its members cooperate across national, commercial, and regional boundaries, sharing information about operating events, maintenance, human performance, management systems, training, emergency preparedness, and other factors that influence plant performance. The organization emphasizes learning from both significant events and less serious deviations, reflecting the nuclear industry's principle that weak signals and recurring problems should be identified before they develop into accidents. The association's principal activities are organized into five broad programs. Peer Review uses experienced nuclear professionals from different organizations and countries to evaluate a member plant against WANO performance objectives and criteria. Performance Analysis gathers and examines operating experience and plant performance information, helping members compare their results with industry benchmarks. Member Support provides missions, technical assistance, guidance, good practices, and help for new nuclear units or organizations entering the nuclear sector. Training and Development offers workshops, seminars, courses, and leadership development activities. Corporate Communications supports the distribution of WANO's mission, findings, guidance, and services to members and relevant external audiences. WANO's peer-review system became one of its most recognizable mechanisms. The first peer review was conducted at Paks Nuclear Power Plant in Hungary in 1992, and peer reviews became a formal WANO program in 1993. In 2006, participation in peer reviews became a membership obligation. By 2010, every operating commercial nuclear power plant worldwide had received at least one WANO peer review, according to the organization's historical account. These reviews are intended to provide an independent industry perspective while preserving the practical knowledge of operators who understand the demands of running nuclear facilities. The organization operates internationally through its London and Shanghai offices and regional centers in Atlanta, Moscow, Paris, and Tokyo, as described in the referenced organizational material. Its members operate approximately 460 civil nuclear power units in more than 30 countries and areas, with the exact membership and reactor count subject to change as plants enter service, retire, or change ownership. WANO's work complements, rather than replaces, national regulatory oversight and international institutions such as the International Atomic Energy Agency. Its distinctive role is to create a global professional network in which operators themselves assess performance and share practices. Following the 2011 Fukushima Daiichi accident, WANO expanded its safety-improvement work through a set of post-Fukushima projects intended for implementation across the global commercial reactor fleet. The association remains an active part of the international nuclear-safety community.

WANO was created in response to the international consequences of the Chernobyl nuclear accident in 1986. The accident demonstrated that weaknesses in nuclear safety could have consequences far beyond the borders of the plant's host country and highlighted the importance of sharing operating experience across different national and corporate systems. Commercial nuclear operators began discussing a permanent organization that could promote direct cooperation among the people and companies responsible for operating nuclear power stations. The organization was formally established on 15 May 1989. Its inaugural meeting took place in Moscow and was jointly hosted by Lord Walter Marshall of Goring, then associated with the United Kingdom's Central Electricity Generating Board, and Nikolai F. Lukonin, the Soviet Union's minister of atomic energy. Approximately 140 delegates from 29 countries supported the initiative and signed WANO's charter. The founding arrangement brought together operators that otherwise competed commercially or worked within very different national regulatory frameworks. WANO's initial purpose was to create mechanisms through which operators could exchange information, identify good practices, and compare performance. In 1990, it published its first identified good practice, concerning predictive maintenance at nuclear plants, and began developing its Performance Indicator program. This program gave members a structured way to collect and compare selected measures of plant performance. The first WANO peer review was carried out at Paks Nuclear Power Plant in Hungary in 1992. Peer reviews became an official WANO program in 1993 and developed into a central feature of the association's work. Reviews use experienced personnel from the international nuclear industry to assess plant performance against WANO objectives and criteria. The approach is intended to encourage candid learning and practical improvement rather than to substitute for a country's statutory regulator. In 2006, WANO made peer reviews an obligation for members. Its historical account states that every operating commercial nuclear power plant had received at least one peer review by 2010. Over time, WANO broadened its activities beyond reviews. Its Performance Analysis program processes operating experience and performance data; Member Support assists plants and organizations with targeted missions, new-unit development, guidance, and improvement activities; Training and Development provides workshops, seminars, courses, and leadership programs; and Corporate Communications helps distribute information about WANO's work to members and relevant external audiences. Together these programs are designed to turn individual plant experience into knowledge that can be applied across the global fleet. The 2011 Fukushima Daiichi accident produced another major turning point. WANO responded by identifying 12 post-Fukushima projects intended to enhance safety and performance at more than 460 commercial nuclear power plants worldwide. The response reinforced the association's role as a mechanism for translating major-event lessons into common industry actions, while national regulators retained responsibility for legal requirements and enforcement. WANO developed a regional structure to support its worldwide membership, with regional centers identified in Atlanta, Moscow, Paris, and Tokyo, as well as offices in London and Shanghai. Its members are primarily owners and operators of commercial nuclear power plants. The organization is described as supporting more than 130 members operating approximately 460 civil nuclear reactors in over 30 countries and areas, although these figures can change with the nuclear fleet. WANO continues to operate as a nonprofit, international, operator-led organization focused on safety, reliability, mutual support, and the exchange of nuclear operating experience.

• 2011

  Post-Fukushima safety projects launched

  [1]World Association of Nuclear Operatorsen.wikipedia.org

  After the Fukushima Daiichi accident, WANO identified 12 projects to improve safety and performance across the international commercial nuclear fleet.

• 2010

  Global operating fleet receives peer reviews

  [1]World Association of Nuclear Operatorsen.wikipedia.org

  WANO reported that every operating commercial nuclear power plant worldwide had received at least one peer review by this year.

• 2006

  Peer reviews become a membership obligation

  [1]World Association of Nuclear Operatorsen.wikipedia.org

  WANO made participation in peer reviews an obligation for its members.

• 1993

  Peer reviews become a formal WANO program

  [1]World Association of Nuclear Operatorsen.wikipedia.org

  The peer-review process was incorporated as an official WANO program, establishing a recurring mechanism for international operator assessment.

• 1992

  First peer review conducted

  [1]World Association of Nuclear Operatorsen.wikipedia.org

  WANO carried out its first peer review at Paks Nuclear Power Plant in Hungary.

• 1990

  Performance indicators and first good-practice publication begin

  [1]World Association of Nuclear Operatorsen.wikipedia.org

  WANO began its Performance Indicator program and published an early good-practice document on predictive maintenance at nuclear plants.

• 1989

  WANO is formally established

  [1]World Association of Nuclear Operatorsen.wikipedia.org

  Delegates at the inaugural meeting in Moscow established WANO on 15 May 1989 and adopted its charter.

• 1986

  Chernobyl accident prompts wider operator cooperation

  [1]World Association of Nuclear Operatorsen.wikipedia.org

  The Chernobyl accident became the principal catalyst for commercial nuclear operators to establish a permanent international organization dedicated to sharing experience and improving plant safety.

A global operator-led benchmark and support network for nuclear safety, reliability, and operational excellence.

• Nuclear operator assessment · 1992

  Peer Review programme

  WANO peer reviews provide a structured assessment of a nuclear station by experienced professionals drawn from the international nuclear operating community. Review teams compare station practices and results with WANO performance objectives and criteria, covering areas relevant to safe and reliable operation. The process is designed to identify strengths, gaps, and opportunities for improvement while promoting the exchange of practical experience between operators. It complements, but does not replace, national regulatory inspections.

• Operating data and benchmarking · 1990

  Performance Analysis programme

  The Performance Analysis programme collects, screens, and analyzes operating experience and performance information supplied by members. Its outputs help operators understand performance trends, compare results with industry benchmarks, and identify issues that may warrant further investigation. The program depends on members sharing data and operating events for the collective benefit of the nuclear industry.

• Technical support

  Member Support programme

  Member Support activities help nuclear organizations address specific safety and reliability challenges. They include support missions, assistance for new nuclear units and new entrants, improvement support, and the development and dissemination of principles, guidelines, and good practices. The program enables members to obtain practical help from peers with relevant operational experience.

• Professional training

  Training & Development programme

  WANO's Training & Development program provides workshops, seminars, training courses, and leadership activities for nuclear operators. It serves established operating stations as well as organizations developing new nuclear capacity, with the objective of strengthening technical competence, management capability, and safety-focused leadership.

• Industry communications

  Corporate Communications programme

  Corporate Communications supports the distribution of WANO's mission, activities, findings, and services. Its audiences include members, nuclear-industry suppliers, new entrants, countries considering nuclear power, other interested organizations, and the media. The program helps make WANO information accessible across the association's international network.

• 2011Post-Fukushima safety-improvement projects

  Global

  WANO developed 12 projects for implementation across the world's commercial nuclear power plants after the Fukushima Daiichi accident. The effort focused the operator community on applying lessons from the accident and strengthening safety and performance.

  Outcome. The projects became a major part of WANO's post-accident support and improvement agenda; the supplied material does not provide a quantified completion result.

  Source

• 2011

  Expand safety work after FukushimaStrategy

  Background

  The Fukushima Daiichi accident created an urgent need for operators worldwide to reassess protection, preparedness, and operational practices.

  Action taken

  WANO identified 12 post-Fukushima projects intended to improve safety and performance across the global commercial reactor fleet.

  Aftermath

  The initiative expanded WANO's post-accident support role and provided a common operator-led framework for applying lessons internationally.

  Source

• 2006

  Make peer reviews a membership obligationStrategy

  Background

  WANO had developed peer reviews into a central method for sharing experience and assessing plant performance.

  Action taken

  The association required members to participate in peer reviews.

  Aftermath

  WANO's historical account states that all operating commercial nuclear power plants had received at least one peer review by 2010.

  Source

1. 1World Association of Nuclear Operatorsen.wikipedia.org
2. 2World Association of Nuclear Operators official websitewano.info