A benchmark study on risk-informed in-service inspection methodologies (RISMET)

Luca Gandossi, Kaisa Simola, Paul Stevenson, Patrick O’Regan, Bengt Lydell, Göran Hultqvist, Anders Leijon, Krister Enger

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

Between 2005 and 2009 JRC and OECD/NEA coordinated a project for benchmarking various risk-informed in-service inspection (RI-ISI) methodologies. In the project, called RISMET, various RI-ISI methodologies were applied to the same case, consisting of 4 selected piping systems at the Swedish nuclear power plant Ringhals unit 4, a 3-loop Westinghouse pressure water reactor. The RI-ISI applications were among each other and to the deterministic ASME section XI ISI selection procedure. More than 20 organisations from Europe, U.S., Canada and Japan took part. The scope of the benchmark was limited to 4 systems, but the variety regarding safety class, potential degradation mechanisms and pipe break consequences ensured a good coverage of issues for a comparative study. The risk-informed methodologies showed some significant differences and resulted in slightly different risk ranking and selection of inspection sites. However, the results of the benchmark indicated that the risk impact of these differences is small, and the RI-ISI approaches identify safety important piping segments that are ignored by approaches not using the probabilistic safety assessment (PSA). The results of the benchmark exercise RISMET improve the knowledge on differences in approaches and their impact on plant safety, and promote the use of risk-informed ISI. This paper summarises the RISMET benchmark project and its main results.
Original languageEnglish
Pages (from-to)450-457
Journalatw - International Journal for Nuclear Power
Volume55
Issue number7
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed

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Inspection
Piping systems
Benchmarking
Nuclear power plants
Pipe
Degradation
Water

Keywords

  • Risk-informed in-service inspection

Cite this

Gandossi, L., Simola, K., Stevenson, P., O’Regan, P., Lydell, B., Hultqvist, G., ... Enger, K. (2010). A benchmark study on risk-informed in-service inspection methodologies (RISMET). atw - International Journal for Nuclear Power, 55(7), 450-457.
Gandossi, Luca ; Simola, Kaisa ; Stevenson, Paul ; O’Regan, Patrick ; Lydell, Bengt ; Hultqvist, Göran ; Leijon, Anders ; Enger, Krister. / A benchmark study on risk-informed in-service inspection methodologies (RISMET). In: atw - International Journal for Nuclear Power. 2010 ; Vol. 55, No. 7. pp. 450-457.
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Gandossi, L, Simola, K, Stevenson, P, O’Regan, P, Lydell, B, Hultqvist, G, Leijon, A & Enger, K 2010, 'A benchmark study on risk-informed in-service inspection methodologies (RISMET)', atw - International Journal for Nuclear Power, vol. 55, no. 7, pp. 450-457.

A benchmark study on risk-informed in-service inspection methodologies (RISMET). / Gandossi, Luca; Simola, Kaisa; Stevenson, Paul; O’Regan, Patrick; Lydell, Bengt; Hultqvist, Göran; Leijon, Anders; Enger, Krister.

In: atw - International Journal for Nuclear Power, Vol. 55, No. 7, 2010, p. 450-457.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - A benchmark study on risk-informed in-service inspection methodologies (RISMET)

AU - Gandossi, Luca

AU - Simola, Kaisa

AU - Stevenson, Paul

AU - O’Regan, Patrick

AU - Lydell, Bengt

AU - Hultqvist, Göran

AU - Leijon, Anders

AU - Enger, Krister

N1 - Project code: 41253

PY - 2010

Y1 - 2010

N2 - Between 2005 and 2009 JRC and OECD/NEA coordinated a project for benchmarking various risk-informed in-service inspection (RI-ISI) methodologies. In the project, called RISMET, various RI-ISI methodologies were applied to the same case, consisting of 4 selected piping systems at the Swedish nuclear power plant Ringhals unit 4, a 3-loop Westinghouse pressure water reactor. The RI-ISI applications were among each other and to the deterministic ASME section XI ISI selection procedure. More than 20 organisations from Europe, U.S., Canada and Japan took part. The scope of the benchmark was limited to 4 systems, but the variety regarding safety class, potential degradation mechanisms and pipe break consequences ensured a good coverage of issues for a comparative study. The risk-informed methodologies showed some significant differences and resulted in slightly different risk ranking and selection of inspection sites. However, the results of the benchmark indicated that the risk impact of these differences is small, and the RI-ISI approaches identify safety important piping segments that are ignored by approaches not using the probabilistic safety assessment (PSA). The results of the benchmark exercise RISMET improve the knowledge on differences in approaches and their impact on plant safety, and promote the use of risk-informed ISI. This paper summarises the RISMET benchmark project and its main results.

AB - Between 2005 and 2009 JRC and OECD/NEA coordinated a project for benchmarking various risk-informed in-service inspection (RI-ISI) methodologies. In the project, called RISMET, various RI-ISI methodologies were applied to the same case, consisting of 4 selected piping systems at the Swedish nuclear power plant Ringhals unit 4, a 3-loop Westinghouse pressure water reactor. The RI-ISI applications were among each other and to the deterministic ASME section XI ISI selection procedure. More than 20 organisations from Europe, U.S., Canada and Japan took part. The scope of the benchmark was limited to 4 systems, but the variety regarding safety class, potential degradation mechanisms and pipe break consequences ensured a good coverage of issues for a comparative study. The risk-informed methodologies showed some significant differences and resulted in slightly different risk ranking and selection of inspection sites. However, the results of the benchmark indicated that the risk impact of these differences is small, and the RI-ISI approaches identify safety important piping segments that are ignored by approaches not using the probabilistic safety assessment (PSA). The results of the benchmark exercise RISMET improve the knowledge on differences in approaches and their impact on plant safety, and promote the use of risk-informed ISI. This paper summarises the RISMET benchmark project and its main results.

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M3 - Article

VL - 55

SP - 450

EP - 457

JO - atw - International Journal for Nuclear Power

JF - atw - International Journal for Nuclear Power

SN - 1431-5254

IS - 7

ER -

Gandossi L, Simola K, Stevenson P, O’Regan P, Lydell B, Hultqvist G et al. A benchmark study on risk-informed in-service inspection methodologies (RISMET). atw - International Journal for Nuclear Power. 2010;55(7):450-457.