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7.1 Numerical Investigation of Nonstationary Outflow Processes, Jet Interaction with Wall, and Load Impact on the Wall in Case of a Gas-cooled Nuclear Power Plant Emergency Loss of Tightness

DOI: 10.1615/ICHMT.1982.AdvCourHeatTransfNucReactSaf.600
pages 937-951

Gennady A. Philippov
Russian Academy of Sciences; All Russian Nuclear Power Engineering Research and Development Institute, Cosmonaut Volkov Str. 6a, 125171 Moscow, Russia

G. A. Saltanov
The All Union Nuclear Power Engineering Research and Development Institute, Moscow, USSR.

M. M. Ghilinskiy
The Institute of Mechanics, Moscow State University, Moscow, USSR

G. P. Simonovskiy


Eu. I. Grichanin


Abstract

Nowadays much attention is being paid to the problem of nuclear power plants security. The accident with lose of tightness of the in-housing devices, plant building structures and equipment and consequent coolant penetration to the environment is particularly dangerous to the plant operating personnel and the inhabitants of the adjacent areas.
The work directed to the high-temperature gas-cooled reactors (HTGR) development with helium as the most effective coolant has put several problems connected with the reactor safety insurance.
Analyses of the emergency situation in the steam generator box in case of the pipeline brake and its development prediction appears one of the most difficult problems. In general such a problem is complex since it includes investigation of complex, essentially non-onedimentional and nonstationary discontinuous flows with geometry changes and power equipment interconnection as well as equipment elements and box wall load determination etc. being taken into consideration.
Investigation of problem of nuclear power plant pipeline lost of tightness can be subdivided into two steps. On the first step gasdynamic flow by the pipeline brake is determined. This aim is achieved by theoretical and experimental modelling of the accident being considered. On the second step the box wall stress is determined by the loads having been calculated on the first step.
In the present paper investigation methods and results achieved on both steps are being presented.
It is assumed that coolant (helium) circulates ina a double pipeline of a tube-in-tube type having outer diameter d1 = 2R and inner diameter d2 = 0.675 d1 . Hot gas passes through the inner pipeline, cooled gas under pressure 4 MPa - through the outer pipeline. Gas velocity in both pipelines is approximately the same but counterdicted.
Loss of tightness is most probable in weld aeams usually located near the pipe bend. One can think about several hypothetical cases of loss of tightness, e.g.:
a) both pipelines break with longitudinal displacement of damaged parts;
b) transverse displacement of one of the damaged parts, no interaction between two coolant flows in observed;
c) see point b, but the break is on the other end of the elbow;
d) elbow break off followed by complex interaction of the two jet flows, etc.

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