Improved Approach for Estimating Leak and Break Frequencies of Piping Systems in Probabilistic Safety Assessment
نویسنده
چکیده
The estimation of leak and break frequencies in piping systems is part of the probabilistic safety assessment of technical plants. In this paper, the statistical method based on the evaluation of the German operational experience for piping systems with different diameters is described because an earlier estimation has been updated and extended introducing new methodical aspects and data. Major point is the inclusion of structure reliability models based on fracture mechanics calculation procedures. As an example of application the statistical estimation method for leak and break frequencies of piping systems with a nominal diameter of 50 mm (the volume control system of a German pressurized water reactor) was updated. Moreover, the evaluation of the operational experience was extended to 341 years with respect to cracks, leaks and breaks in the volume control system of German pressurized water reactors (PWR). Using the actual data base, new calculations of leak and break frequencies have been performed and the results have been compared with the previous values.
منابع مشابه
Structural Health Monitoring of Piping in Nuclear Power Plants – A Review of Efficiency of Existing Methods
In the first part of the report, we review various efforts that have been recently performed in the USA in the field of reactor health monitoring. They were carried out by different organizations and they addressed different issues related to the safety of nuclear reactors. Among other aspects, we present technical issues related to the design of a self-diagnostic monitoring system for the next...
متن کاملKewaunee Nuclear Power Plant REQUEST TO EXCLUDE DYNAMIC EFFECTS ASSOCIATED WITH POSTULATED PIPE RUPTURES FROM LICENSING BASIS FOR RESIDUAL HEAT REMOVAL. ACCUMULATOR INJECTION, AND SAFETY INJECTION SYSTEM PIPING BASED UPON LEAK BEFORE BREAK ANALYSIS
In accordance with 10 CFR 50, Appendix A, General Design Criteria 4, the Nuclear Management Company, LLC, (NMC) requests Nuclear Regulatory Commission (NRC) review and approval to exclude the dynamic effects associated with postulated pipe ruptures from the Kewaunee Nuclear Power Plant (KNPP) licensing basis. This request is for portions of the KNPP Residual Heat Removal (RHR), Accumulator Inje...
متن کاملFinding a Probabilistic Approach to Develop a Fuzzy Expert System for the Assessment of Research Projects using ANP Approach
Nowadays, project selection is a vital decision in many organizations. Because competition among research projects in order to gain more budgets and to attain new scientific domain has increased. Due to multiple objectives and budgeting restrictions for academic research projects have led to the use of expert system for decision making by academic and research centers. The existing methods suff...
متن کاملStatistical Review of Major Standpoints in Hydraulic Transient-Based Leak Detection
Today, pipe systems are the most common facilities to convey various fluids from one place to another. In such facilities faults like leaks lead to advert consequences such as economic losses and social health threats. The fact that early detection of leaks can play a prominent role in reducing the amount of these undesired impacts has absorbed noticeable attention from researchers to this fiel...
متن کاملLoad Frequency Control in Power Systems Using Improved Particle Swarm Optimization Algorithm
The purpose of load frequency control is to reduce transient oscillation frequencies than its nominal valueand achieve zero steady-state error for it.A common technique used in real applications is to use theproportional integral controller (PI). But this controller has a longer settling time and a lot of Extramutation in output response of system so it required that the parameters be adjusted ...
متن کامل