Iodine Revolatilization in a Grand Gulf Loca

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The TRENDS models are applied at each time step to each control volume. Significant amounts of water occur only in the wetwell and drywell sump (the refueling pool is not a factor, as discussed earlier). In Fig. 2, we show the radiolytic acid production feeding into each of these pools. Since the water is initially neutral and no chemical additives are present, the acid additions are the major factors affecting pH. In Fig. 3, we see the downward trend of pH resulting from these acid additions. The conversion of iodide (I{sup {minus}}) to molecular iodine (I{sub 2}) is most noticeable ... continued below

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17 p.

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Beahm, E.C. & Weber, C.F. January 1, 1999.

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Description

The TRENDS models are applied at each time step to each control volume. Significant amounts of water occur only in the wetwell and drywell sump (the refueling pool is not a factor, as discussed earlier). In Fig. 2, we show the radiolytic acid production feeding into each of these pools. Since the water is initially neutral and no chemical additives are present, the acid additions are the major factors affecting pH. In Fig. 3, we see the downward trend of pH resulting from these acid additions. The conversion of iodide (I{sup {minus}}) to molecular iodine (I{sub 2}) is most noticeable in the wetwell, since this is the repository of most iodide and HCl. Gradually, during the transient small amounts of more volatile iodine are formed. While iodide remains the dominant form, noticeable amounts of I{sub 2} and intermediate species are created. Once produced in water, some I{sub 2} is free to evaporate into airspace. Fig. 4 indicates the increase in all airborne iodine throughout the transient. This is compared to the MELCOR result for CsI aerosol, which decreases dramatically due to containment sprays. The I{sub 2} in the airspace can be vented to the enclosure building or the environment. In the present accident sequence, the only path to the environment was through the SGTS, which was assumed to operate as in MELCOR. However, both are dwarfed by the MELCOR gaseous release during the first 12 h because MELCOR does not model spray washout of gaseous iodine. Steadily increasing throughout the transient, the revolatilization release is eventually more than an order-or-magnitude higher than the MELCOR aerosol release. Also, 99% of iodine flowing directly through the SGTS was retained in filters. The remaining 1% was released to the environment. In addition, a small flow bypassing the SGTS filters vented directly into the environment. The total released from these two paths is shown in Fig. 5.

Physical Description

17 p.

Notes

INIS; OSTI as DE00004199

Medium: P; Size: 17 pages

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  • Other Information: PBD: 1 Jan 1999

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  • Report No.: ORNL/M-6544
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/4199 | External Link
  • Office of Scientific & Technical Information Report Number: 4199
  • Archival Resource Key: ark:/67531/metadc676952

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  • January 1, 1999

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • April 7, 2017, 3:35 p.m.

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Beahm, E.C. & Weber, C.F. Iodine Revolatilization in a Grand Gulf Loca, report, January 1, 1999; Tennessee. (digital.library.unt.edu/ark:/67531/metadc676952/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.