IODINE RETENTION STUDIES. Progress Report, January--June 1969.

Milham, R.C.; Jones, L.R.

doi:10.2172/4726226

Cited by 2 publications

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“…This curve represents conservative values for iodine retention efficiency because annual partial regeneration treatment (for the "Freon'" leak test) improves the carbon quality. 3 In a single test on carbon regenerated after 56 months of service, the iodine retention efficiency improved from 99.32% to 99.94%. However, preliminary tests indicate that partial regeneration may be beneficial for only a few months.…”

Section: Effect Of Servicementioning

confidence: 99%

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IODINE RETENTION STUDIES. Progress Report, July--December 1969.

Milham¹,

Jones²

1970

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The retention of iodine by activated carbon was measured by tests simulating predicted conditions during power surge and lossof-coolant accidents. The iodine retention efficiency of carbon in the power surge test decreases significantly with on-line service in the confinement system, but remains higher than 99.85% after 3.8 years. Studies in the loss-of-coolant test are incomplete. Partial regeneration of the carbon in both tests increased the iodine retention efficiency. A facility with a 5 x 10 7 rads/hr 60 CO source for determining the effect of intense gamma radiation on methyl iodide adsorption, particulate filter media, and other materials is nearing completion.

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Section: Effect Of Servicementioning

confidence: 99%

“…Previous reports summarize the progress from January 1965 to June 1969. ' - 3 This report summarizes the iodine retention studies at the Savannah River Laboratory from July to December 1969.…”

Section: Introductionmentioning

confidence: 99%

IODINE RETENTION STUDIES. Progress Report, July--December 1969.

Milham¹,

Jones²

1970

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“…The rationale behind the use of KOH is that it serves two purposes: 1) it promotes formation of the nonvolatile iodide by (5) and, 2) it increases solution pH to prevent the OH radical attack of the iodide 22 OH + I ~ I + OH (1) which occurs in neutral or acidic solutions. In alkaline solution, the OH radicals are dissociated by the reaction 22 OH ... H+ + 0- (6) The effectiveness of KOH as an additive was briefly examined. With the same KI concentration as previously used, experiments were performed with KOH concentrations of la-3 M and 8 x lO-3M (0.05 wt %).…”

Section: Influenoe Of Additives On Iodine Evaporationmentioning

confidence: 99%

Confinement of airborne radioactivity. Progress report: January--December 1975

Evans¹,

Dexter²

1975

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Efforts are underway at Savannah River Laboratory (SRL) and the Naval Research Laboratory (NRL) to develop new carbonimpregnant formulations suitable for use in nuclear power plants as well as in the SRP system. Emphasis has been placed on carbons derived from domestic raw materials and impregnated with an amine having lower vapor pressure, higher flash point, and lower cost than triethylenediamine (TEDA). Promising results have been obtained with carbons derived from coal, petroleum, wood, and coconut and impregnated with a combination of iodine salts and hexamethylenetetramine (HMTA). Service-aging of several of the HMTA-iodine salt carbons is also being studied. A separate study of the ability of sodium thiosulfate and potassium hydroxide to retain iodine in aqueous solutions in the presence of high-intensity gamma radiation show that concentrations of ~l wt % thiosulfate are required to reduce iodine evolution to less than 1%. A 0.05 wt % addition of potassium hydroxide has about the same effect. These studies revealed that lower concentrations of thiosulfate actually appear to promote evolution of both iodine and an unidentified species of iodine that is capable of penetrating several inches of carbon adsorber. The unidentified iodine compounds are, however, efficiently retained by a HEPA filter. This result suggests that the penetrating iodine may exist in the form of a particulate or aerosol. Iodine 17 CONFINEMENT OF AIRBORNE RADIOACTIVITY

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IODINE RETENTION STUDIES. Progress Report, January--June 1969.

Cited by 2 publications

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IODINE RETENTION STUDIES. Progress Report, July--December 1969.

IODINE RETENTION STUDIES. Progress Report, July--December 1969.

Confinement of airborne radioactivity. Progress report: January--December 1975

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