[en] The structure is composed of a containment vessel having a cylindrical skirt and a dome, and a ring building surrounding the containment vessel. The ring building is composed of a cylindrical skirt and a roof, the containment vessel and the ring building rising on a joint general raft. Internal structures are positioned inside the containment vessel. The roof of the ring building is in the shape of a truncated cone or toric and is set in the cylindrical skirt of the containment vessel. The internal structures are independent of the containment vessel

[en] The rule applies to the fabrication of safety containments of steel for stationary lightwater reactors including the supports connected with the safety containment, as well as for pressure-bearing parts of transfer canals. (orig./HP)

[en] After describing the containment of the PWR power station at Paluel in France, its role is defined. The methods used to limit the global leakage of the internal vessel are then described. To do so, an examination is made of the porosity of the concrete and cracking, concrete repairs and the treatment of repairs by injection in those areas where air tests have revealed the presence of leaks

[en] Short communication

[en] In this paper containment buildings of 1300 MW PWR are examined: how concrete is put into position and tests with pressurized air for verification of tightness

[en] The principal purpose of the SAREF Reactor Containment Building (RCB) is to prevent the uncontrolled release of radioactive materials to the atmosphere as a result of accidental occurrences inside the containment. The RCB houses numerous reactor systems and components including the Prestressed Concrete Reactor Vessel (PCRV). The design of the RCB is of reinforced concrete (steel-lined). The containment building is embedded nearly 100 feet in lava rock. It has therefore been necessary to independently formulate an appropriate and conservative design approach

[en] Estimates of the rate of heat removal from the containment atmosphere following a loss of colant accident (LOCA) are important to the prediction of containment peak pressure and temperature which are essential parameters in designing the containment building. An overall survey and discussion of mechanisms, experimental results, empirical correlations and analytical models that are relevant to the heat transfer inside the containment have been made. As a result of this review, the current state of the konwledge about the containment heat transfer can be understood and it is known that more investigations are needed to avoid the misuse of various correlations. (Author)

[en] The initial Integrated Leak Rate Test (ILRT) of the Fast Flux Test Facility containment building was performed from May 27 to June 2, 1978. The test was conducted in air with systems vented and with the containment recirculating coolers in operation. 10 psig and 5 psig tests were run using the absolute pressure test method. The measured leakage rates were .033% Vol/24 hr. and -.0015% Vol/24 hrs. respectively. Subsequent verification tests at both 10 psig and 5 psig proved that the test equipment was operating properly and it was sensitive enough to detect leaks at low pressures. This ILRT was performed at a lower pressure than any previous ILRT on a reactor containment structure in the United States. While the initial design requirements for ice condenser containments called for a part pressure test at 6 psig, the tests were waived due to the apparent statistical problems of data analysis and the repeatability of the data itself at such low pressure. In contrast to this belief, both the 5 and 10 psig ILRT's were performed in a successful manner at FFTF

[en] A material access lock as defined by this standard is a pressure-resistant and technically gas-tight hollow body connected with the containment and which has got two gates, the inner one of which connects the lock chamber with the interior of the containment and the outer one of which connects the lock chamber with the exterior. It serves exclusively for transferring material or objects. (orig.)

[en] The stability analysis for a steel containment shell is presented herein. The containment is a freestanding shell consisting of a vertical cylinder with a hemispherical dome. It is stiffened by large ring stiffeners and relatively small longitudinal stiffeners. The containment vessel is subjected to both static and dynamic loads which can cause buckling. These loads must be combined prior to their use in a stability analysis. The buckling loads were computed with the aid of the ASME Code case N-284 used in conjunction with general purpose computer codes and in-house programs. The equations contained in the Code case were used to compute the knockdown factors due to shell imperfections. After these knockdown factors were applied to the critical stress states determined by freezing the maximum dynamic stresses and combining them with other static stresses, a linear bifurcation analysis was carried out with the aid of the BOSOR4 program. Since the containment shell contained large penetrations, the Code case had to be supplemented by a local buckling analysis of the shell area surrounding the largest penetration. This analysis was carried out with the aid of the NASTRAN program. Although the factor of safety against buckling obtained in this analysis was satisfactory, it is claimed that the use of the Code case knockdown factors are unduly conservative when applied to the analysis of buckling around penetrations. (orig.)