Rolled Joint Separation by Shock 2A-18 Heating

Abstract

Following the rupture of the pressure tube and calandria tube (CIT) in Unit 2 of Bruce "A" NGS (B2N06) on March 28, 1986, n development program for calandria tubeitubesheet (CIT-TIS) rolled joint separation using shock heating initiated The separation process was complicated field inspection results which revealed the existence of a circumferential crack on one of the rolled joint inserts. A shock heating process for separating undamaged CCITIT rolled joints was developed, which satisfied the constraints imposed by the presence of the crack, and was successfully demonstrated in the Ontario Hydro Research Laboratory and Bruce "A" NGS. A decision was then made to proceed with this technique to separate the CIT rolled joints of channel B2N06. With the joint efforts of Ontario Hydro Research and Bruce "A" NGS staff, CIT inserts were separated from the B2N06 channel on May 20 and 21, 1986, and the CIT was removed from the channel on May 23, 1986. This paper describes the programs carried out at both Ontario Hydro Research and Bruce "A" NGS for the successful implementation of the shock heating technique for the separation of CIT rolled joints of channel B2N06.