Second phase test of the 1MW steam generator; Progress of operation, dismantling and cleaning

*; Morimoto, Makoto*; *; *; *; Kuroha, Mitsuo; *

PNC TN941 77-104, 101 Pages, 1977/06

PNC-TN941-77-104.pdf:3.89MB

After finishing first phase test, the 1MW Steam Generator was modified and second phase test was started from February 1973 and finished the test by June 1975. Then the steam Generator was dismantled, cleaned, and structural materials of the steam generator were externally inspected. This is to report the progress of operation of second phase test, repairing of facility and to describe the details of dismantling and cleaning of the steam generator addng the explanations of external inspection with photographs. Items clarified by the second phase test, followed by dismantling and cleaning were as follows : (1)Modifications based on the first phase test results were effective to improve the performance of the steam generator. (2)It was demonstrated that the cleaning of steam generator by flushing mixture of steam and argon gases was safe and effective. (3)During the external inspection after dismantling, they were observed slight deformations, and in way of the tube supports, wearing of tubes, which was supposed to be caused by fretting, was also observed.