Development of uncertainty methodology for COBRA-TF void distribution and critical power predictions
Başlık çevirisi mevcut değil.
- Tez No: 402200
- Danışmanlar: DR. LAWRENCE HOCHREITER
- Tez Türü: Doktora
- Konular: Eğitim ve Öğretim, Education and Training
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2008
- Dil: İngilizce
- Üniversite: The Pennsylvania State University
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 366
Özet
Özet yok.
Özet (Çeviri)
Thermal hydraulic codes are commonly used tools in licensing processes for the evaluation of various thermal hydraulic scenarios. The uncertainty of a thermal hydraulic code prediction is calculated with uncertainty analyses. The objective of all the uncertainty analysis is to determine how well a code predicts with corresponding uncertainties. If a code has a big output uncertainty, this code needs further development and/or model improvements. If a code has a small uncertainty, this code needs maintenance program in order to keep this small output uncertainty. Uncertainty analysis also indicates the more validation data is needed. Uncertainty analyses for the BWR nominal steady state and transient scenarios are necessary in order to develop and improve the two phase flow models in the thermal hydraulic codes. Because void distribution is the key factor in order to determine the flow regime and heat transfer regime of the flow and critical power is an important factor for the safety margin, both steady state void distribution and critical power predictions are important features of a code. An uncertainty analysis for these two phenomena/cases provides valuable results. These results can be used for the development of the thermal hydraulic codes that are used for designing a BWR bundle or for licensing procedures. This dissertation includes the development of a particular uncertainty methodology for the steady state void distribution and critical power predictions. In this methodology, the PIRT element of CSAU was used to eliminate the low ranked uncertainty parameters. The SPDF element of GRS was utilized to make the uncertainty methodology flexible for the assignment of PDFs to the uncertainty parameters. The developed methodology includes the uncertainty comparison methods to assess the code precision with the sample-averaged bias, to assess the code spreading with the sample-averaged standard deviation and to assess the code reliability with the proportion of specimens among the sample with a bias lower than the experimental uncertainty. Besides, the rankings of dominant phenomena are observed with the second comparison method (sensitivity analysis). Simple Random Sampling, Order Statistics, Richardson Extrapolation are some of the methods that are in the developed methodology. This uncertainty methodology was implemented for the COBRA-TF predictions. The uncertainty and sensitivity results are presented in the dissertation.
Benzer Tezler
- A bayesian belief network based delay risk assessment tool for tunnel projects – BBN tunnel
Tünel projeleri için bayes ağı tabanlı bir gecikme riski değerlendirme aracı – BBN tunnel
GÜLSÜM ÇAĞIL KÖSEOĞLU BALTA
Doktora
İngilizce
2019
İnşaat MühendisliğiOrta Doğu Teknik Üniversitesiİnşaat Mühendisliği Ana Bilim Dalı
PROF. MUSTAFA TALAT BİRGÖNÜL
PROF. DR. İREM DİKMEN TOKER
- An approach for energy efficient retrofits evaluation of educational buildings through life-cycle cost optimization in Turkey
Türkiye'deki eğitim yapılarının yaşam döngüsü maliyet optimizasyonu ile enerji etkin yenilenmesi için bir yaklaşım
YİĞİT YILMAZ
Doktora
İngilizce
2017
Enerjiİstanbul Teknik ÜniversitesiMimarlık Ana Bilim Dalı
PROF. DR. GÜL KOÇLAR ORAL
- Yatırım fizibiliteleri üzerinde hedef programlamasının uygulanması
Linear goal programming applications on investment projects
E.ŞEBNEM SOYDAN
Yüksek Lisans
Türkçe
1993
Endüstri ve Endüstri Mühendisliğiİstanbul Teknik ÜniversitesiDOÇ.DR. MEHMET TANYAŞ
- Çok kriterli sıralama ve seçim problemleri için fermatean bulanık SWARA - TOPSIS metodolojisi önerisi
Fermatean fuzzy SWARA - TOPSIS methodology proposal for multi-criteria ranking and selection problems
HAKAN AYDOĞAN
Yüksek Lisans
Türkçe
2023
Endüstri ve Endüstri MühendisliğiYıldız Teknik ÜniversitesiEndüstri Mühendisliği Ana Bilim Dalı
DOÇ. DR. VİLDAN ÖZKIR
- Örgüt topluluklarında yeni örgüt formlarının oluşumu: Türkiye ve Avrupa bağlamında bir araştırma
Formation of new organizational forms in organizational populations: A study in the context of Türkiye and Europe
SENCER ÖZEL
Doktora
Türkçe
2024
İşletmeGalatasaray Üniversitesiİşletme Ana Bilim Dalı
PROF. DR. NACİYE AYLİN ATAAY SAYBAŞILI