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Journal Articles

Consideration of decontamination model for severe accident consequence assessment

Silva, K.*; Okamoto, Koji*; Ishiwatari, Yuki*; Takahara, Shogo; Promping, J.*

Journal of Nuclear Science and Technology, 52(11), p.1402 - 1416, 2015/11

 Times Cited Count:2 Percentile:73.66(Nuclear Science & Technology)

Journal Articles

Development of accident consequence assessment scheme using accident cost and consideration of decontamination model

Silva, K.*; Okamoto, Koji*; Ishiwatari, Yuki*; Takahara, Shogo; Promping, J.*

Proceedings of 12th Probabilistic Safety Assessment and Management Conference (PSAM-12) (USB Flash Drive), 12 Pages, 2014/06

no abstracts in English

Journal Articles

Cost per severe accident as an index for severe accident consequence assessment and its applications

Silva, K.*; Ishiwatari, Yuki*; Takahara, Shogo

Reliability Engineering & System Safety, 123, p.110 - 122, 2014/03

AA2012-0781.pdf:0.77MB

 Times Cited Count:11 Percentile:46.26(Engineering, Industrial)

The experiences of the Fukushima Accident and also the Chernobyl Accident point out the needs to integrate the assessments of health effects, economic, social and environmental impacts of severe accidents in nuclear power plants, in order to perform a comprehensive consequence assessment. The authors introduced the cost per severe accident as an index for that purpose. The index is calculated based on the systematic accident consequence assessment method which consists of level 2 and 3 probabilistic risk assessments. In the present study, the index was used to evaluate the consequences of severe accidents of a virtual boiling water reactor. The breakdown of the cost per severe accident was provided, and the decontamination cost accounted for the greatest proportion. As applications of the index, it was used to optimize the management levels of protective actions for the public, and to evaluate the consequence-reduction effects of accident management.

Journal Articles

Estimation of cost per severe accident for improvement of accident protection and consequence mitigation strategies

Silva, K.*; Ishiwatari, Yuki*; Takahara, Shogo

Proceedings of Probabilistic Safety Assessment and Management Topical Conference; In light of the Fukushima Dai-ichi Accident (PSAM 2013) (USB Flash Drive), 10 Pages, 2013/04

The "cost per severe accident" was introduced as an index to analyze improvement of accident protection and consequence mitigation strategies. This index consists of various costs and consequences converted into monetary values. The evaluations of these costs and consequences were made based on the systematic consequence analysis using level 2 and 3 PSA. The accident sequences were taken from the results of level 2 seismic PSA. The doses to the public and the number of people affected were calculated using the level 3 PSA code OSCAAR. The data obtained from the open documents on the Fukushima Accident are used as much as possible. Sensitivity analyses are carried out to identify the sensitive assumptions or parameters to the cost per severe accident. Base on the results of the sensitivity analyses, optimized accident protection and consequence mitigation strategies are recommended taking into account the various aspects comprehensively using the cost per severe accident.

Journal Articles

Modification of severe accident consequence analysis calculation method of nuclear power plant and consideration of effect of discount rate

Silva, K.*; Ishiwatari, Yuki*; Takahara, Shogo

Proceedings of 2nd International Symposium on Technology for Sustainability (ISTS 2012) (USB Flash Drive), p.31 - 34, 2012/11

The authors introduced the external cost regarding severe accident as an index for severe accident consequence analysis of nuclear power plants in the previous work. In this research, we modify the calculation methods of two components of the external cost regarding severe accident; decontamination cost and health effect cost, in order to obtain more reality-based results. The decontamination cost calculation method is renewed based on data obtained from decontamination demonstration project of JAEA and land use data of Ibaraki Prefecture. Willingness to pay is used to estimate the health effect cost instead of human capital method. To investigate the effect of discount rate on severe accident consequence, sensitivity analysis was performed using discount rates from 0%, 1%, 3%, 5%. Changes of the fractions of the costs comprising the external cost regarding severe accident are very small even in the case of discount rate of 5%.

Journal Articles

Integration of direct/indirect influences of severe accidents for improvements of nuclear safety

Silva, K.*; Ishiwatari, Yuki*; Takahara, Shogo

Proceedings of 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference (ICONE-20 & POWER 2012) (DVD-ROM), 9 Pages, 2012/07

Journal Articles

Event structure and double helicity asymmetry in jet production from polarized $$p + p$$ collisions at $$sqrt{s}$$ = 200 GeV

Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Y.*; Al-Bataineh, H.*; Alexander, J.*; Aoki, K.*; Aphecetche, L.*; Armendariz, R.*; et al.

Physical Review D, 84(1), p.012006_1 - 012006_18, 2011/07

 Times Cited Count:22 Percentile:28.74(Astronomy & Astrophysics)

We report on the event structure and double helicity asymmetry ($$A_{LL}$$) of jet production in longitudinally polarized $$p + p$$ collisions at $$sqrt{s}$$ = 200 GeV. Photons and charged particles were measured by the PHENIX experiment. Event structure was compared with the results from PYTHIA event generator. The production rate of reconstructed jets is satisfactorily reproduced with the next-to-leading-order perturbative QCD calculation. We measured $$A_{LL}$$ = -0.0014 $$pm$$ 0.0037 at the lowest $$P_T$$ bin and -0.0181 $$pm$$ 0.0282 at the highest $$P_T$$ bin. The measured $$A_{LL}$$ is compared with the predictions that assume various $$Delta G(x)$$ distributions.

Journal Articles

Identified charged hadron production in $$p + p$$ collisions at $$sqrt{s}$$ = 200 and 62.4 GeV

Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Armendariz, R.*; et al.

Physical Review C, 83(6), p.064903_1 - 064903_29, 2011/06

 Times Cited Count:140 Percentile:0.67(Physics, Nuclear)

Transverse momentum distributions and yields for $$pi^{pm}, K^{pm}, p$$, and $$bar{p}$$ in $$p + p$$ collisions at $$sqrt{s}$$ = 200 and 62.4 GeV at midrapidity are measured by the PHENIX experiment at the RHIC. We present the inverse slope parameter, mean transverse momentum, and yield per unit rapidity at each energy, and compare them to other measurements at different $$sqrt{s}$$ collisions. We also present the scaling properties such as $$m_T$$ and $$x_T$$ scaling and discuss the mechanism of the particle production in $$p + p$$ collisions. The measured spectra are compared to next-to-leading order perturbative QCD calculations.

Journal Articles

Azimuthal correlations of electrons from heavy-flavor decay with hadrons in $$p+p$$ and Au+Au collisions at $$sqrt{s_{NN}}$$ = 200 GeV

Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Aramaki, Y.*; et al.

Physical Review C, 83(4), p.044912_1 - 044912_16, 2011/04

 Times Cited Count:7 Percentile:49.35(Physics, Nuclear)

Measurements of electrons from the decay of open-heavy-flavor mesons have shown that the yields are suppressed in Au+Au collisions compared to expectations from binary-scaled $$p+p$$ collisions. Here we extend these studies to two particle correlations where one particle is an electron from the decay of a heavy flavor meson and the other is a charged hadron from either the decay of the heavy meson or from jet fragmentation. These measurements provide more detailed information about the interaction between heavy quarks and the quark-gluon matter. We find the away-side-jet shape and yield to be modified in Au+Au collisions compared to $$p+p$$ collisions.

Journal Articles

Measurement of neutral mesons in $$p$$ + $$p$$ collisions at $$sqrt{s}$$ = 200 GeV and scaling properties of hadron production

Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Y.*; Al-Bataineh, H.*; Alexander, J.*; Aoki, K.*; Aphecetche, L.*; Armendariz, R.*; et al.

Physical Review D, 83(5), p.052004_1 - 052004_26, 2011/03

 Times Cited Count:133 Percentile:1.64(Astronomy & Astrophysics)

The PHENIX experiment at RHIC has measured the invariant differential cross section for production of $$K^0_s$$, $$omega$$, $$eta'$$ and $$phi$$ mesons in $$p + p$$ collisions at $$sqrt{s}$$ = 200 GeV. The spectral shapes of all hadron transverse momentum distributions are well described by a Tsallis distribution functional form with only two parameters, $$n$$ and $$T$$, determining the high $$p_T$$ and characterizing the low $$p_T$$ regions for the spectra, respectively. The integrated invariant cross sections calculated from the fitted distributions are found to be consistent with existing measurements and with statistical model predictions.

Oral presentation

Research on methodology of external cost evaluation of nuclear power severe accident and its uses for risk reduction

Silva, K.*; Ishiwatari, Yuki*; Takahara, Shogo

no journal, , 

no abstracts in English

Oral presentation

Introduction of external cost regarding severe accident as an index of nuclear power plant risk and its relationship with sourceterm

Silva, K.*; Ishiwatari, Yuki*; Takahara, Shogo

no journal, , 

In this research, the authors introduce the "external cost regarding severe accident" as an index to evaluate the effect of severe accident in a nuclear power plant. This can contribute to an improvement in nuclear power plant risk evaluation which needs not only probability evaluations but also effect evaluations. To calculate the external cost regarding severe accident, typical sequences of severe accidents are picked up first. Containment failure frequency (CFF) and sourceterms of each sequence are taken from the results of level 2 PSA. The sourceterm of each sequence is input into the level 3 PSA code OSCAAR which was developed by Japan Atomic Energy Agency (JAEA). Using these outputs, the external cost regarding severe accident is calculated. The results were compared with the amount of sourceterms of each severe accident which can be one of the indexes to evaluate the effects of severe accident.

Oral presentation

Consideration of decontamination cost calculation model for severe accident consequence assessment indexed by cost per severe accident

Silva, K.*; Okamoto, Koji*; Ishiwatari, Yuki*; Takahara, Shogo; Promping, J.*

no journal, , 

13 (Records 1-13 displayed on this page)
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