<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>In the models developed by probabilistic safety analyses (PSA) and in their applications associated with nuclear power plants (NPPs), the risk importance of a particular feature can be, most generally, divided into two categories: importance with respect to the risk-increase potential and importance with respect to the risk-decrease potential. A representative measure of the first category is risk achievement worth (RAW), while a representative measure of the second category is risk reduction worth (RRW). The present paper discusses the use of RAW and RRW in achieving safe design and points out some implications of their mutual dependency on the selection of a risk-reduction strategy. A simple example is provided to illustrate the differences between the two basic strategies and point out to the main issues and conclusions.</p>
</abstract>

In the models developed by probabilistic safety analyses (PSA) and in their applications associated with nuclear power plants (NPPs), the risk importance of a particular feature can be, most generally, divided into two categories: importance with respect to the risk-increase potential and importance with respect to the risk-decrease potential. A representative measure of the first category is risk achievement worth (RAW), while a representative measure of the second category is risk reduction worth (RRW). The present paper discusses the use of RAW and RRW in achieving safe design and points out some implications of their mutual dependency on the selection of a risk-reduction strategy. A simple example is provided to illustrate the differences between the two basic strategies and point out to the main issues and conclusions.

Consideration of quantitative risk reduction and risk achievement measures in safe NPP design

Nukleonika

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

In the models developed by probabilistic safety analyses (PSA) and in their applications associated with nuclear power plants (NPPs), the risk importance of a...

Case	R_new	Strategy 1 q₁	Strategy 2 r
a	2.00E–04	1.00E–04	0.10
b	1.90E–04	9.00E–05	0.09
c	1.80E–04	8.00E–05	0.08
d	1.70E–04	7.00E–05	0.07
e	1.60E–04	6.00E–05	0.06
f	1.50E–04	5.00E–05	0.05

Case	Strategy 1 I_RAW,X,1	Strategy 2 I_RAW,X,2	Strategy ½ I_RRW,X
a	5000.00	500.50	2.00
b	5263.16	474.21	1.90
c	5555.56	445.00	1.80
d	5882.35	412.35	1.70
e	6250.00	375.63	1.60
f	6666.67	334.00	1.50

Case	Strategy 1 I_rel,X,1	Strategy 2 I_rel,X,2
a	1.00E+00	1.00E–01
b	1.00E+00	9.00E–02
c	1.00E+00	8.00E–02
d	1.00E+00	7.00E–02
e	1.00E+00	6.00E–02
f	1.00E+00	5.00E–02

Consideration of quantitative risk reduction and risk achievement measures in safe NPP design

Article Category: Original Paper

Published Online: Jun 25, 2024

Page range: 119 - 124

Received: Oct 03, 2023

Accepted: Mar 07, 2024

DOI: https://doi.org/10.2478/nuka-2024-0017

Keywords
Nuclear power plant, Probabilistic safety assessment, Risk achievement, Risk-importance measures, Risk reduction

© 2024 Ivan Vrbanic et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1.

Fig. 2.

Fig. 3.

Fig. 4.

Fig. 5.

Reliability parameters for preselected new risk targets

RAW and RRW values for the cases from Table 1

Reliability importance measure for the cases from Table 1

Consideration of quantitative risk reduction and risk achievement measures in safe NPP design

Article Category: Original Paper

Published Online: Jun 25, 2024

Page range: 119 - 124

Received: Oct 03, 2023

Accepted: Mar 07, 2024

DOI: https://doi.org/10.2478/nuka-2024-0017

KeywordsNuclear power plant, Probabilistic safety assessment, Risk achievement, Risk-importance measures, Risk reduction

© 2024 Ivan Vrbanic et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1.

Fig. 2.

Fig. 3.

Fig. 4.

Fig. 5.

Reliability parameters for preselected new risk targets

RAW and RRW values for the cases from Table 1

Reliability importance measure for the cases from Table 1

Keywords
Nuclear power plant, Probabilistic safety assessment, Risk achievement, Risk-importance measures, Risk reduction