Design limits for HT9 cladding using stress-induced aging data

Conference · Tue Apr 01 04:00:00 EST 1986

OSTI ID:7125009

Fox, G L

Stress-temperature design guidelines are developed for the ferritic/martensitic cladding material HT9. High temperature operation for HT9 may cause microstructural changes/aging which softens the structure and causes increased creep rates. Higher creep strains means cladding breech becomes more probable before the end of the expected pin lifetime. Tertiary creep is considered an indication of microstructural changes and is to be avoided in fuel pin operation. The creep rate correlation, which includes tertiary creep, is examined for information on stress-temperature relationships which promote aging. This approach leads to design limits for HT9 which are compared with expected hot channel conditions for fuel pins in the Core Demonstration Experiment (CDE) planned for FFTF. The results show aging should not be significant for CDE.

• Research Organization: Hanford Engineering Development Lab., Richland, WA (USA)
• DOE Contract Number: AC06-76FF02170
• OSTI ID: 7125009
• Report Number(s): HEDL-SA-3484-FP; CONF-860931-8; ON: DE87004348
• Country of Publication: United States
• Language: English

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AGING
ALLOY-HT-9
ALLOYS
BREEDER REACTORS
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CREEP
CRYSTAL STRUCTURE
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MECHANICAL PROPERTIES
MICROSTRUCTURE
REACTORS
STEELS
STRESSES