| 摘要 |
The adapter ( 12 ) and the mechanism housing ( 13 ) are made in a single piece, in the form of an integrated housing that is attached by means of the adapter tube ( 12 ) in a penetration opening ( 9 a , 9 b) of the vessel head ( 10 ). The tubular sheath ( 14 ) comprises a threaded part ( 14 a) that is screwed into a tapped part ( 13 c) at the end of the integrated housing ( 15 ), in a perfectly coaxial disposition. A sealing weld ( 18 ) is made between two respective sealing lips of the integrated housing ( 15 ) and of the tubular sheath ( 14 ). The weld joint ( 18 ) is made by melting a filler metal between two joining end parts of the sealing lips by an automatic orbital welding method. The step for mounting and welding the tubular sheath ( 14 ) onto the integrated housing ( 15 ) may be carried out on the nuclear reactor site with a faultless production of the welded joint ( 18 ).
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