Effect of chemical composition on irradiation creep of stainless steels irradiated in the BOR-60 reactor at 420 degrees C

摘要

The irradiation creep of six steels was investigated. For these steels, the Cr-Ni equivalents were calculated and the dependences of creep moduli on Ni equivalent were plotted. Pressurized tubes made from these steels were irradiated in different cells in row 6 of the BOR-60 reactor. The maximum damage doses achieved were about 60 and 100 dpa at irradiation temperature of 420 degreesC in various experiments. The levels of specified stresses changed from 0 to 320 MPa. The specimens were periodically removed from the reactor during refueling to measure their strain and then were returned to the reactor. The creep modulus B decreases with an increase of Ni equivalent over 16%. The dependence of creep modulus on Ni equivalent is similar to the dependence swelling on Ni. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 13]