VVER Working Group (VVERWG)

The MDEP VVER Working Group (VVERWG) was approved by MDEP Policy Group in September 2013. The group's work is focused on the safety reviews of Rosatom's VVER reactors.

The national regulatory authorities participating in the VVERWG include:

• China
• Hungary
• Russia
• Türkiye

The VVERWG's main objectives are as follows:

• to leverage resources and ensure that the VVER design reviews remain safety-focused;
• to exchange information about their safety reviews in the areas of Fukushima lessons learned enhancements, safety systems, reactor pressure vessel and primary circuit, construction oversight, severe accidents, radiation protection, spent fuel pool and fire protection, taking into account design differences among countries and differences in licensing processes.

The VVERWG reports the status of its activities three times a year at the MDEP Steering Technical Committee (STC) meetings.

Key stakeholders with whom the VVERWG interacts routinely include Rosatom and utilities pursuing licensing and construction of the VVER, such as Akkuyu Power Company in Turkey.

Accomplishments

For more information, see the MDEP Annual Report: 2018-2019.

Programme plan

2020-2021 Programme Plan

Products

Common Positions

• CP-VVERWG-01: Addressing Fukushima-related issues, May 2017
• CP-VVERWG-02: Addressing ex-vessel corium stabilization in core catcher, June 2021
• CP-VVERWG-03: Reactor pressure vessel and primary components reliability for AES-2006 designs, October 2021

Technical Reports

• TR-VVERWG-01: Regulatory approaches and criteria used in severe accident analyses and severe accident management, November 2017
• TR-VVERWG-02: Regulatory approaches and oversight practices related to reactor pressure vessel and primary components, May 2017
• TR-VVERWG-03: Regulatory approaches related to accidents and transients analyses, March 2019
• TR-VVERWG-04: Core Catcher, June 2021
• TR-VVERWG-05: Hydrogen Recombiners, June 2021
• TR-VVERWG-06: Preliminary Analyses & Comparison of Design differences between VVER-1000 Reactors, 2019
• TR-VVERWG-07: Regulatory requirements and practices for uncertainty evaluations of deterministic safety analysis

Last reviewed: 19 June 2023