RESTRAINING SEAL

Abstract

A limit stop for limiting the effect of severe accident consequences on process equipment connected by pipelines passing through walls. The stop may be used, in particular, in the nuclear industry. The limit stop installed in a protective wall. The stop is made in the form of an anchor with horizontal grooves and an insert into the pipeline with horizontal teeth. The anchor is mounted on a protective wall. The insert is installed on the pipeline from the outer side of the protective wall. The anchor and insert are made with the possibility of locking the teeth in the grooves during torsion. The insert is provided with a postulated break site.

Claims

1. A limit stop installed in a protective wall, characterized in that the stop is made in the form of an anchor with horizontal grooves and an insert into the pipeline with horizontal teeth, the anchor is mounted on a protective wall, the insert is installed on the pipeline from the outer side of the protective wall, the anchor and insert are made with the possibility of locking the teeth in the grooves during torsion, the insert is provided with a postulated break site.

Description

LIST OF FIGURES, DRAWINGS AND OTHER MATERIALS

[0014] FIG. 1 shows a general view of the limit stop for the main steam and feed water pipelines.

DETAILS CONFIRMING THE FEASIBILITY OF EMBODIMENT OF THE INVENTION

[0015] The main steam and feed water pipeline runs from the steam chamber of the nuclear island of the NPP through two protective walls. A limit stop is installed in each protective wall, in the opening through which the pipeline passes, consisting of an anchor I with horizontal grooves 3 attached to the protective wall by means of, for example, bolts, and an insert 2 with horizontal teeth 4 attached to the pipeline, with the teeth 4 entering the grooves 3 with the possibility of moving in the horizontal direction.

[0016] The limit stop operates as follows. In normal operation mode, the limit stops consisting of an anchor I attached to the protective wall and an insert 2 attached to the pipeline ensure temperature horizontal movements of the pipeline. In design basis mode, the pipeline 6 will inevitably receive bending stresses and deformations because the pipeline 6 has bends on the outside of the protective walls. This will cause the teeth of the insert 4, installed on the insert in the pipeline 2, to be wedged in the horizontal grooves 3 of the anchor 1, which will lead to fixation of the pipeline in the protective wall and help to avoid destruction of the steam chamber equipment. In severe accident mode, the load on the pipeline can reach 38.5 MN, so in order to save the equipment of the steam chamber the limit stop is additionally provided with a postulated break site 5 located outside the protective wall and preventing the pipeline from being pulled out of the building. The postulated break site 5 may be in the form of a weakened section of the pipe insert, such as an annular groove designed to rupture when appropriate loads are reached.

[0017] The limit stop allows to increase the safety of operation of high pressure pipelines and can be applied in the energy industry.