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FP6

European Framework Document for Risk-informed In-service Inspection

Funded under: FP6-JRC

Abstract

In-service inspection (ISI) is an essential element of the defence in depth concept. ISI consists of non-destructive examination as well as pressure and leakage testing. ISI helps to confirm that basic nuclear safety functions are preserved and that the probability of radioactive materials breaching containment is reduced.
Defence in depth is defined by two principles: accident prevention and accident mitigation. This high level definition of defence in depth has been traditionally broken down further into five levels, the first two being [5]:
1) Prevention of abnormal operation and failures.
2) Control of abnormal operation and detection of failures.
ISI plays an important role in the above-mentioned two levels of defence in depth. It contributes to the prevention of failures by monitoring plant status. Furthermore, it contributes to the control of abnormal operation by detecting degradation in mitigating systems.
Risk-informed in-service inspection (RI-ISI) reflects recent developments in Probabilistic Safety Assessment (PSA) technology, the understanding of degradation mechanisms (e.g. structural reliability modelling, root cause evaluations) and the experience gained from nearly 10,000 reactor years operating experience of NPPs.
RI-ISI aims at rational plant safety management by taking into account the results of plant-specific risk analyses. The fundamental idea is to identify high-risk locations where the inspection efforts should be concentrated. The objective is to provide an ongoing improvement in the overall plant safety, measured by risk, together with reduced doses for the inspection teams.

Additional information

Authors: CHAPMAN O J V, European Commission, Joint Research Centre, Institute for Energy, Petten (NL);GANDOSSI L, European Commission, Joint Research Centre, Institute for Energy, Petten (NL);MENGOLINI A, European Commission, Joint Research Centre, Institute for Energy, Petten (NL);SIMOLA K, European Commission, Joint Research Centre, Institute for Energy, Petten (NL);EYRE T, European Commission, Joint Research Centre, Institute for Energy, Petten (NL);WALKER A E, European Commission, Joint Research Centre, Institute for Energy, Petten (NL)
Bibliographic Reference: EUR 21581 EN (2005), 45 pp. Free of charge
Availability: Available from European Commission, JRC Knowledge Management Unit, Ispra (IT) Tel: +39 033278 9893 Fax: +39 033278 5409 E-mail: jrc-info@ec.europa.eu or Bruxelles (BE) Tel: +32 2 295 76 24 Fax: +32 2 299 63 22
Record Number: 200718952 / Last updated on: 2007-03-16
Category: PUBLICATION
Original language: en
Available languages: en
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