Investigation of flammable gas and thermal safety issues for retrieval of waste from Tank 241-AN-105

Caley, S.M.; Stewart, Charles W.; Antoniak, Z.I.; Cuta, JM; Mahoney, Lenna A.; Panisko, F.E.

doi:10.2172/665987

“…A degassing strategy using the two mixer pumps proposed for retrieval of AN-105 was developed based on the mitigation of SY-101 during Phase B pump operations (Caley et al 1998). The mixer pumps proposed for AN-105 are significantly more powerful than the mixer pump in SY-101; at their minimum operating speed of 700 rpm, they approximate the maximum performance of the SY-101 mixer pump at its maximum practical speed of 1000 rpm.…”

Section: Mixer Pump Degassingmentioning

confidence: 99%

“…The work described above was performed in 1998 (Caley et al 1998) and 1999. (a) During this time the most urgent safety issue at Hanford was the waste level growth phenomenon occurring in SY-101.…”

Section: Improving the Models And Predictionsmentioning

confidence: 99%

Analysis of Induced Gas Released During Retrieval of Hanford Double-Shell Tank Waste

Wells¹,

Cuta²,

Hartley³

et al. 2002

0

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Radioactive waste is currently scheduled to be retrieved from Hanford double-shell tanks AN-103, AN-104, AN-105 and AW-101 and transferred to the vitrification plant beginning about 2009. Retrieval may involve decanting the supernatant liquid and/or mixing the waste with jet pumps. In these four tanks, which contain relatively large volumes of retained gas, both of these operations are expected to induce buoyant displacement gas releases that can potentially raise the tank headspace hydrogen concentration to very near the lower flammability limit. This report describes the theory and detailed physical models for both the supernate decant and jet mixing processes and presents the results from applying the models to these operations in the four tanks. The technical bases for input parameter distributions are elucidated. xiv

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“…By early December the jets had mixed most of the gas-bearing sediment layer because gas releases for the remainder of Phase B testing were relatively small. A degassing strategy using the two mixer pumps proposed for retrieval of AN-105 was developed based on the mitigation of SY-101 during Phase B pump operations (Caley et al 1998). The mixer pumps proposed for AN-105 are significantly more powerful than the mixer pump in SY-101; at their minimum operating speed of 700 rpm, they approximate the maximum performance of the SY-101 mixer pump at its maximum practical speed of 1000 rpm.…”

Section: Mixer Pump Degassingmentioning

confidence: 99%

“…This gas release resulted from four 20minute mixer pump runs at 360, 510, 720, and 920 rpm at a fixed angle. The calculated energy supplied to the waste by the pump during this period was approximately 18.2 kW-hr (Caley et al 1998). A single mixer pump in AN-105, operated at 700 rpm for 24 minutes, was calculated to supply equivalent energy for a roughly equivalent waste disturbance.…”

Section: Mixer Pump Degassingmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of Induced Gas Releases During Retrieval of Hanford Double-Shell Tank Waste

Wells¹,

Cuta²,

Hartley³

et al. 2002

0

View full text Add to dashboard Cite

Radioactive waste is scheduled to be retrieved from Hanford double-shell tanks AN-103, AN-104, AN-105 and AW-101 and transferred to the vitrification plant beginning in about 2009. Retrieval may involve decanting the supernatant liquid and/or mixing the waste with jet pumps. In these four tanks, which contain relatively large volumes of retained gas, both operations are expected to induce buoyant displacement gas releases that can potentially raise the tank headspace hydrogen concentration to a level very near the lower flammability limit. This report describes the theory and detailed physical models for both the supernatant decant and jet mixing processes and presents the results from applying the models to these operations in the four tanks. The technical bases for input parameter distributions are elucidated.

show abstract

Analysis of Induced Gas Releases During Retrieval of Hanford Double-Shell Tank Waste

Wells¹

2003

View full text Add to dashboard Cite

Radioactive waste is scheduled to be retrieved from Hanford double-shell tanks AN-103, AN-104, AN-105 and AW-101 and transferred to the vitrification plant beginning in about 2009. Retrieval may involve decanting the supernatant liquid and/or mixing the waste with jet pumps. In these four tanks, which contain relatively large volumes of retained gas, both operations are expected to induce buoyant displacement gas releases that can potentially raise the tank headspace hydrogen concentration to a level very near the lower flammability limit. This report describes the theory and detailed physical models for both the supernatant decant and jet mixing processes and presents the results from applying the models to these operations in the four tanks. The technical bases for input parameter distributions are elucidated.

show abstract

Investigation of flammable gas and thermal safety issues for retrieval of waste from Tank 241-AN-105

Cited by 3 publications

References 15 publications

Analysis of Induced Gas Released During Retrieval of Hanford Double-Shell Tank Waste

Analysis of Induced Gas Released During Retrieval of Hanford Double-Shell Tank Waste

Analysis of Induced Gas Releases During Retrieval of Hanford Double-Shell Tank Waste

Analysis of Induced Gas Releases During Retrieval of Hanford Double-Shell Tank Waste

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