IODINE RETENTION STUDIES. Progress Report, July--December 1970.

Evans, A.G.; Jones, L.R.

doi:10.2172/4703267

Cited by 2 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…HEPA filter . blinding data presented earlier 9 show that this elevated temperature could be attained in a hypothetical accident. Moreover, because of the sensitivity of some commercial carbons to high temperature, the high-temperature desorption test has been proposed for inclusion in the ASTM Standards for carbon testing.…”

Section: High-temperature Desorption Testsmentioning

confidence: 51%

Confinement of airborne radioactivity. Progress report, January--December 1974

Dexter¹,

Evans²,

Jones³

1974

View full text Add to dashboard Cite

Several commercial activated carbons, marketed for iodine removal in reactor off-gas cleanup systems, were evaluated for iodine penetration at elevated temperatures (4 hr at 180°C), and the penetration data varied widely. Subsequent chemical analysis of the samples indicated a strong correlation between the atom ratio of iodine to potassium (11K) in the carbon and the hig~ temperature performance data. Carbons containing excess iod~ne (11K >1) performed consistently poorer than carbons with excess potassium (11K <1). Excess alkalinity (as indicated by a high pH of a water extract of carbon) was also shown to be required for efficient iodine retention. Improved iodine retention was Obtained for three carbons (coconut, coal, and petroleum base) with proper adjustment of the I and K content and the pH of the carbon in laboratory impregnations. Iodine penetration tests were also performed on several carbons in an intense gamma radiation field (>10 7 rads/hr). Test data show that carbons intentionally exposed to high concentrations of OOP aerosol performed as well as unexposed carbons. Studies of the rate of evaporation of elemental iodine from aqueous sOlutions indicated that significant quantities of 12 might be expected to become airborne within a short period of time (5 hr) after release to open ponds. Addition of sodium thiosulfate to the solution substantially reduced the evaporative loss of iodine; however, the effects of high-intensity radiation fields on iodine-thiosulfate solutions remain to be evaluated. Small HEPA filters containing filter media of the type used in the Savannah River confinement system were exposed to reactor building air and a high-intensity radiation field. Following this exposure, they were tested for flow performance under simulated accident conditions. Radiation exposure slightly impaired the performance of new filters and improved the performance of service-aged filters. Service aging effects on filter performance were far more significant than radiation effects. t.

show abstract

Section: High-temperature Desorption Testsmentioning

confidence: 51%

Confinement of airborne radioactivity. Progress report, January--December 1974

Dexter¹,

Evans²,

Jones³

1974

View full text Add to dashboard Cite

show abstract

“…The exhaust system for each reactor building includes five confinement filter compartments to contain released radioactivity in the event of a reactor accident. 7 Exhaust fans maintain a negative pressure in the reactor room, the ducts to the filters, and the filter compartments. Four or five compartments are usually on-line.…”

Section: Confinement Of Particulate Activitymentioning

confidence: 99%

CONFINEMENT OF AIRBORNE RADIOACTIVITY. Progress Report, January--June 1971.

Evans¹,

Jones²

1971

Self Cite

View full text Add to dashboard Cite

Radiolytic desorption tests of a series of carbon samples containing KI 3 , KI, triethylenediamine (TEDA), or combinations of TEDA and KI showed that a 10 x 16 mesh coconut shell carbon containing 1% TEDA, 2% KI,and a proprietary flame retardant retained iodine better than all products tested except those containing higher TEDA concentrations.Ignition temperature measurements on the same series of samples showed that the 1% TEDA -2% KI product has an ignition temperature of about 330°C under SRP flow conditions (the same as the KI3 carbon). The 1% TEDA -2% KI carbon has been selected to replace the unimpregnated carbon currently used in the Savannah River reactor confinement system.-2 - CONTENTS

show abstract

IODINE RETENTION STUDIES. Progress Report, July--December 1970.

Cited by 2 publications

References 0 publications

Confinement of airborne radioactivity. Progress report, January--December 1974

Confinement of airborne radioactivity. Progress report, January--December 1974

CONFINEMENT OF AIRBORNE RADIOACTIVITY. Progress Report, January--June 1971.

Contact Info

Product

Resources

About