Iodine stress-corrosion cracking in irradiated Zircaloy cladding. [PWR; BWR]

Conference · Mon Jan 01 04:00:00 EST 1979

OSTI ID:6019532

Mattas, R. F.; Yaggee, F. L.; Neimark, L. A.

Irradiated Zircaloy cladding specimens, which had experienced fluences from 0.1 to 6 x 10/sup 21/ n/cm/sup 2/ (E>0.1 MeV), were gas-pressure tested in an iodine environment to investigate their stress-corrosion cracking (SCC) susceptibility. The test temperatures and hoop stresses ranged from 320 to 360/sup 0/C and 150 to 500 MPa, respectively. The results indicate that irradiation, in general, increases the susceptibility of Zircaloy to iodine SCC. For specimens that experienced fluences >2 x 10/sup 21/ n/cm/sup 2/ (E>0.1 MeV), the 24-h failure stress was 177+-18 MPa, regardless of the preirradiation metallurgical condition. An analytical model for iodine SCC has been developed which agrees reasonably well with the test results.

• Research Organization: Argonne National Lab., IL (USA)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6019532
• Report Number(s): CONF-790441--7
• Country of Publication: United States
• Language: English

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