Discussion on Practical Elimination of Early or Large Releases for WWER-1000/V320

Pavlin Groudev,Emil Kichev,Petya Petrova

doi:10.4236/jpee.2018.65002

Abstract

The paper presents a brief summary of the introduction of the term “practical elimination” as prevention of the conditions that could lead to early or large radioactive releases. The concept of “practical elimination” is defined as part of the Defence in Depth (DiD) of Nuclear Power Plant (NPP) in the International Atomic Energy Agency (IAEA) document INSAG-12 in 1999. But, the special attention to it was paid after the accident in Fukushima NPP in 2011. The mechanisms of the containment failure of reactor WWER-1000/V320 are presented. As an example, the summarized design features and preventing and mitigation measures already implemented at Kozloduy NPP to extend the design basis and beyond design basis envelop are presented. Issues related to external steam explosion are underlined for further study.

Highlights

Based on the International Atomic Energy Agency (IAEA) INSAG-12 [1], the Defence in Depth (DiD) concept [2] [3] provides an overall strategy for safety measures and features of Nuclear Power Plants (NPPs)
The special attention to it was paid after the accident in Fukushima NPP in 2011
The summarized design features and preventing and mitigation measures already implemented at Kozloduy NPP to extend the design basis and beyond design basis envelop are presented

Summary

Introduction

Based on the IAEA INSAG-12 [1], the Defence in Depth (DiD) concept [2] [3] provides an overall strategy for safety measures and features of Nuclear Power Plants (NPPs) (para 47). A continuous effort to increase the scope of the severe accidents that have been taken into consideration and to reduce their off-site consequences, a further reduction the potential radiological consequences is an important goal for future NPPs (para 124). An important advantage of future plants is their ability to incorporate corrections to deficiencies identified in the past (para 125).

Methods

Discussion

Conclusion