A method for removing and installing a control rod drive from a drive housing mounted in the vessel of a boiling water reactor. The method comprises having a carriage supported by and movable along the service rails normally present in the undervessel cavity, and a cradle pivotally connected to the carriage...http://www.google.de/patents/US5019325?utm_source=gb-gplus-sharePatent US5019325 - Method for removing and installing a control rod drive
