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Best Estimate Plus Uncertainty (BEPU) approach and safety margins in nuclear reactor safety

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Topical Issues in

Nuclear

Installation Safety

Safety Demonstration of Advanced

Water Cooled Nuclear Power Plants

Proceedings of an International Conference

6–9 June 2017, Vienna, Austria

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IAEA Library Cataloguing in Publication Data

Names: International Atomic Energy Agency.

Title: Topical issues in nuclear installation safety / International Atomic Energy Agency.

Description: Vienna : International Atomic Energy Agency, 2018. | Series: Proceedings

series (International Atomic Energy Agency), ISSN 0074–1884 | Includes bibliographical

references.

Identifiers: IAEAL 18-01171 | ISBN 978–92–0–104618–5 (paperback : alk. paper)

Subjects: LCSH: Nuclear reactors — Safety measures — Congresses. | Nuclear reactors —

Design and construction. | Reliability (Engineering)

Classification: UDC 621.039.58 | STI/PUB/1829.

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BEPU and Safety Margins in Nuclear Reactor Safety

F. D’Auria, H. Glaeser, N. Debrecin

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BEPU AND SAFETY MARGINS IN NUCLEAR REACTOR SAFETY

F. D’AURIA

University of Pisa (DESTEC/GRNSPG Pisa, Italy Email: f.dauria@ing.unipi.it H. GLAESER Consultant, Eching, Germany N. DEBRECIN

University of Zagreb (FEEC) Zagreb, Croatia

Abstract

Approaches like Best Estimate Plus Uncertainty (BEPU) and concepts like Safety Margins (SM) are well established in Nuclear Reactor Safety (NRS). However continuous improvements in analytical techniques and in the sophistication of hardware products do not necessarily correspond to new industrial applications within Nuclear Power Plants (NPP) technology.

The declining condition for nuclear technology also contributes to the lag between developments and

applications definitely causing NPP safety at a level below the achievable level. The possibility to extend BEPU to all areas of the Final Safety Analysis Report (FSAR), so-called BEPU-FSAR is outlined in the paper. This should be combined with the Extension of the SM concept (E-SM). BEPU-FSAR techniques may be at the origin of E-SM which also will need specific monitoring hardware. All of this may open new horizons for NRS and for acceptance of NPP by the public and the decisions makers. The paper describes recent

accomplishments in the areas of BEPU and E-SM.

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