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In which unit MTBF values are calculated and what are the operation rate for Continuous and Intermittent profile.

MTBF are given in hours computed following RDF2000 Reliability model (UTE C 80-810 standard) - Equipment ambient temperature at 30°C (86°F), 60°C (140°F) and 70°C (158°F) for Hardened parts.
Continuous operation profile: 100% operation rate per year (365d/year, 24h/day) - 12 power on/off per year (1 per month) - No stocking days 
Intermittent operation profile: 46% operation rate per year (335d/year, 12h/day) - 335 power on/off per year (1 per operating day) - 30 stocking days. 
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