Metal working – Method of mechanical manufacture – Repairing
Patent
1989-08-03
1991-02-12
Eley, Timothy V.
Metal working
Method of mechanical manufacture
Repairing
2940208, 29407, 29723, B23P 600, B23P 1904
Patent
active
049912801
ABSTRACT:
A method for replacing bolts on core components of nuclear reactors includes machining away a bolt fastened at an installation site in a core component as well as the entire fastening of the bolt with an electroerosion machine. Machined-away bolt material is removed and caught with a filter. The bolt is then ejected from the core component with a closed force system. The installation site of the bolt is remachined with an accurate fit and a new bolt is subsequently inserted. An apparatus for replacing bolts on core components of nuclear reactors includes rails. An auxiliary platform is supported on the rails on both sides of a reactor pressure vessel. An auxiliary crane is disposed on the auxiliary platform and adjustable transverse to the rails. A tool carrier is guided on the auxiliary platform and suspended from the auxiliary crane. A tool is disposed on the tool carrier for replacing bolts on core components.
REFERENCES:
patent: 4376332 (1983-03-01), Sandefur
patent: 4748733 (1988-06-01), Hahn et al.
Kerntechnik 52 (1988) No. 1, pp. 53-56; "Replacement of bolts" Ch. Hillrichs.
Gerstenhoefer Alfred
Kaeufl Theo
Kautetzky Anton
Krippner Ulrich
Reimer Gerd
Eley Timothy V.
Greenberg Laurence A.
Lerner Herbert L.
Siemens Aktiengesellschaft
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