system (PAMS)
5. Topics for future studies and development There are many ideas for further future development:
* For instance the piping models can be enhanced with models of the vessels they are connected to. In FPIPE this is possible with a combined 3D shell and piping model, see Figure 12 below.
* Also some macros have been developed to generate 3-D solid models for ANSYS. An example for a Tee is shown in Figure 13 below. Input is again directly generated from PAMS. Some continuation to this step can be:
• Develop a full 3D solid model of a piping system analysis entity directly from PAMS.
• Develop a local 3D solid model a piping system around a detail to be investigated in very large detail. This could be a crack in a weld, then to be modelled with a crack growth processor program. An example like this is at present developed with a combination of the programs ANSYS and Zencrack. This model can then automatically get boundary conditions from previously performed FPIPE-analyses.
Figure 13. Combined piping model and macro generated 3D solid model of a Tee.
* Transient thermal- and flow analysis and flow induced loads, like water hammer or pump transients and pipe break loads. Will it be possible to generate an input file to a thermo-hydraulic program and write the analysis results back into the database? This is probably only a question of time and the choice of a suitable program.
* Back coupling of pressure and temperature measurements. The inside temperature transients to be determined from the measured outside temperature transients. A study on available techniques and tools will be performed and the possible application studied.
* Coupling of a program performing EN/PED piping and component analysis according to the EN Standards.
* Bimetallic weld analysis. This would involve a complicated FEM analysis to be coupled to the database. Some efforts have been made to make 3D model macros for Tees.
* Transient and event monitoring based on events and/or measurements. * Bookkeeping of inspection results. This will already be started in the end of
2009.
* Multiple run development. This already functions for the analysis of different transients in one analysis entity. The automatic analysis of all transients in multiple analysis entities followed by fatigue analysis of all analysis nodes in the analysed analysis entities will be developed in the near future.
* Valve strength analysis. Some analysis tools have already been developed. Coupling to the database is under development, but has a low priority and may be shifted forward.
* Continuous development of visual input and output interfaces. * Addition of the associated-report information to the input given
* Automatic update after changes to loading or geometry. This will be developed when the bookkeeping routines are more mature.
* Probabilistic analysis will be developed in parallel with the development of suitable postprocessing programs.
* Improve the load handling in three stages as described below:
o In the first stage of the load input project all design transients from the final safety analysis reports (FSAR) will be entered into the PAMS system together with their designed number of occurrences. This has been done already.
o In the second stage of the load input project the designed number of occurrences will be replaced by the number of occurrences from the actual event history plus the number of occurrences that is extrapolated from that
same event history. At the same time the events get a time stamp. Some preparation work has been done for this.
o In the third stage of the load input project the design transients will be redefined with help of the temperature and flow measurements in the units and a new software tool. The have been gathered since a long time. * Feasibility studies will be performed with regard to interfaces to one-
dimensional pipe loading analysis programs, CFD-programs, modal analysis and update, general-purpose FEM programs and true neutral files.
References
1. Raiko, H., Lipponen, A., Smeekes, P. & Talja, H. Load-Case, and -Combination Database. SMiRT 16 Paper 1869, 2001.
2. Talja, H., Smeekes, P., Torkkeli, E., Laaksonen, J., Rostedt, J., Haapaniemi, H., Lipponen, A., Saarenheimo, A. & Solin, J. Lifetime of pressure retaining components (PUKK). Espoo: VTT Manufacturing Technology, 2000. Report VAL64-001549. 22 p.
3. Smeekes, P., Talja, H., Saarenheimo, A. & Haapaniemi, H. Numerical Simulation of Piping Vibrations Using Modal Correlation. SMiRT 16 Paper 1866, 2001.
4. FPIPE, a finite element method (FEM) based piping analysis program developed at FEMdata Oy, Finland.
5. VTT BESIT 1.0 by VTT Manufacturing Technology, Finland.
6. ASME Boiler And Pressure Vessel Code, Section III, Nuclear Power Plant Components, Division 1, Subsection NB, Class 1 Components.
7. Smeekes, P., Lipponen, A., Raiko, H. & Talja, H. The TVO Pipeline Analysis and Monitoring System. SMiRT 16 Paper 1868, 2001.
8. Microsoft® Access 2000, Relational Database Management System for Windows.
9. Simola, K., Talja, H. & Smeekes, P. Use of plant specific information in life management, PLIM 2002 IAEA-CN-92 /10
10. Smeekes, P., Lipponen, A., Raiko, H. & Talja, H. The TVO Pipeline Analysis and Monitoring System, SMiRT 17, 2003.
11. Smeekes, P., Alhainen, J., Lipponen, A. & Talja, H. The TVO/VTT material database, SMiRT 17, 2003.
12. NUREG/CR-6909 ANL-06/08, Rev. 0, 1.2.2006, Chopra O. K., Argonne National Laboratory, Effect of LWR Coolant Environments on the Fatigue Life of Reactor Materials.
13. Smeekes, P. The TVO Pipeline Analysis and Monitoring System, SMiRT 19, 2003.