NITRITE INGROWTH AND STRESS CORROSION CHARACTERIZATION OF TANK 11H SUPERNATE

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Waste supernate stored in Tank 11H was analyzed periodically from May 1973-August 1975 to determine the rate of nitrite ingrowth by radiolytic decomposition of nitrate. This waste was transferred to tank 33F in accordance with TA 2-892, Rev. 1, 'Use of Cracked Tank for Fresh High Level Waste,' during the week of November 10, 1975. This letter summarizes analytical and corrosion characterization which indicate that this transfer should not increase the risk of stress corrosion cracking in F Area non-stress-relieved tanks. An interpretation of the nitrite ingrowth data is presented and used as a basis for cokncluding that the crack ... continued below

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Ondrejoin, R. November 25, 1975.

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Waste supernate stored in Tank 11H was analyzed periodically from May 1973-August 1975 to determine the rate of nitrite ingrowth by radiolytic decomposition of nitrate. This waste was transferred to tank 33F in accordance with TA 2-892, Rev. 1, 'Use of Cracked Tank for Fresh High Level Waste,' during the week of November 10, 1975. This letter summarizes analytical and corrosion characterization which indicate that this transfer should not increase the risk of stress corrosion cracking in F Area non-stress-relieved tanks. An interpretation of the nitrite ingrowth data is presented and used as a basis for cokncluding that the crack in Tank 11H occurred early in 1974. The formation of nitrite in waste supernate was followed for 2 1/4 years during the last filling and storage cycle in 11H. The conversion of nitrate to nitrite in the 1 1/2 year period after filling was 4.9 x 10{sup -11} mol NO{sub 2}{sup -}/{ell} BTU of fission product heat. The energy released during the period was 1.15 x 10{sup 10} BTU with a corresponding increase in nitrite of 0.56 mol/{ell}. The crack that was first observed in Tank 11H in April 1974 probably made its final penetration through the wall in March 1974 based on nitrite in-growth calculations and analyses of supernate for the NO{sub 3}{sup -}/NO{sub 2}{sup -} ratio. Analyses for {sup 137}Cs/{sup 134}Cs in the dried salt crust did not yield a definite estimate of the time of penetration because waste from high-burnup, off-site fuel made up the last 20% of the present fill. Laboratory tests indicate that the OH{sup -} (1.5M) and NO{sub 2}{sup -}(1.2M) concentrations present in Tank 11H prior to transfer to F Area should sufficient for efficient inhibition of nitrate stress corrosion cracking. Electrochemically controlled tensile tests of A285-B steel specimens in synthetic 11H supernate at 100 C showed almost no loss of mechanical properties, and there was no visible evidence of crack propagation in precracked and stressed (45 kpsi/in.) wedge opening loaded specimens after 1000 hours exposure in synthetic supernate at 97 C. These tests are more severe than the actual tank conditions; 11H supernate was about 40 C when transferred.

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  • Report No.: DPST-75-507
  • Grant Number: DE-AC09-08SR22470
  • DOI: 10.2172/1010268 | External Link
  • Office of Scientific & Technical Information Report Number: 1010268
  • Archival Resource Key: ark:/67531/metadc840806

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  • November 25, 1975

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • Dec. 12, 2016, 4:21 p.m.

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Ondrejoin, R. NITRITE INGROWTH AND STRESS CORROSION CHARACTERIZATION OF TANK 11H SUPERNATE, report, November 25, 1975; United States. (digital.library.unt.edu/ark:/67531/metadc840806/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.