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97122 DOUBLE-SHELL TANK REMAINING USEFUL LIFE ESTIMATES

Picture for 97122 DOUBLE-SHELL TANK REMAINING USEFUL
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Product Number: 51300-97122-SG
ISBN: 97122 1997 CP
Author: R. P. Anantatmula, P. C. Ohl
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The existing 28 double-shell tanks (DSTS) at Hanford are currently planned to continue operation through the year 2028 when disposal schedules show removal of waste. This schedule will place the DSTs in a service life window of 40 to 60 years depending on tank construction date and actual retirement date.This paper examines comosion-related life-limiting condhions of DSTS and reports the results of remaining useful life models developed for estimating remaining tank life. Three models based on controllable parameters such as temperature, chemistry, and relative humidity are presented for estimates to the year in which a particular DST may receive a breach in the primary tank due to pitting in the liquid or vapor region. Pitting is believed to be the life-limiting condition for DSTs, however, the region of the most aggressive pitting (vapor space or liquid) requires further investigation. The results of the models presented suggest none of the existing DSTS should fail by through-wall pitting until well beyond scheduledretrieval in 2028. The estimates of tank breach years (the year in which a tank may be expected to breach the primary tank wall) range from 2056 for pitting corrosion in the liquid region of tank 104-AW to beyond the next millennium for several tanks in the vapor region. Keywords: double-shell treks, usefillife esttiates, pitiingcomosion, cmbonsteel, vapor phme, liquid phase, Hmford, corrosivity factor
The existing 28 double-shell tanks (DSTS) at Hanford are currently planned to continue operation through the year 2028 when disposal schedules show removal of waste. This schedule will place the DSTs in a service life window of 40 to 60 years depending on tank construction date and actual retirement date.This paper examines comosion-related life-limiting condhions of DSTS and reports the results of remaining useful life models developed for estimating remaining tank life. Three models based on controllable parameters such as temperature, chemistry, and relative humidity are presented for estimates to the year in which a particular DST may receive a breach in the primary tank due to pitting in the liquid or vapor region. Pitting is believed to be the life-limiting condition for DSTs, however, the region of the most aggressive pitting (vapor space or liquid) requires further investigation. The results of the models presented suggest none of the existing DSTS should fail by through-wall pitting until well beyond scheduledretrieval in 2028. The estimates of tank breach years (the year in which a tank may be expected to breach the primary tank wall) range from 2056 for pitting corrosion in the liquid region of tank 104-AW to beyond the next millennium for several tanks in the vapor region. Keywords: double-shell treks, usefillife esttiates, pitiingcomosion, cmbonsteel, vapor phme, liquid phase, Hmford, corrosivity factor
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