241-AZ Tank Farm Construction Extent of Condition Review for Tank Integrity

Barnes, Travis J.; Boomer, K. D.; Gunter, Jason R.; Venetz, Theodore

doi:10.2172/1089516

Cited by 1 publication

(2 citation statements)

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“…Decants from this tank will be transferred to tanks AP-102, AP-108, and AN-101. Details on each of the structures are contained in extent of condition reviews that were recently completed [3] [4]. The primary tank wall for each was constructed of A537 carbon steel.…”

Section: Materials Of Construction For the Waste Tanks And Transfer Lmentioning

confidence: 99%

“…Raw river water remained in the tank for up to 8 months. No report on the hydrostatic leak test was uncovered [3] and therefore the condition of the tank primary is not known. However, additional information on Tank AN-107, a tank constructed at the same time, may provide some insight on the aggressiveness of the raw water.…”

Section: Materials Of Construction For the Waste Tanks And Transfer Lmentioning

confidence: 99%

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Corrosion Evaluation for Tank 241-AP-106 Re-purposing

Wiersma

2019

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Tank AP-106 will be an integral part of the Direct Feed Low Activity Waste (DF-LAW) activity. This tank is an underground, carbon steel, double shell tank (DST). Before it can be utilized, the Cs-137 concentration levels in the waste must be reduced significantly. The AP-106 re-purposing process will manage normal waste tank additions procedures such that waste acceptance criteria objectives for Cs-137 removal are achieved. As this process was being developed, concerns regarding tank integrity during and after the process to Tank AP-106 and associated tanks (i.e., AP-102, AN-101, and AP-108) were addressed. The degradation mechanisms identified include: general and pitting corrosion, caustic stress corrosion cracking, galvanic corrosion, and microbiologically induced corrosion (MIC). Recommendations were provided to minimize the exposure of the tank to corrosive conditions (see Section 6.0). These recommendations included chemistry adjustments at defined steps in the process that will maintain the waste in compliance with the corrosion control program. Additionally, sampling and inspection (see Sections 6.0 and 7.0, respectively) recommendations that will assess the final condition of the tank environment and the tank were presented. The greatest risk for this process involves the handling of large quantities of Columbia River water (i.e., greater than 450,000 gallons) within the AP-106, associated tanks and supporting infrastructure (i.e., transfer line piping). As long as this water is blended into the supernate in a timely fashion, and the waste is adjusted appropriately with corrosion inhibitors, the final condition is expected to be within compliance. Recommendations were also made to address process interruptions that could result in exposure of the tank walls to aggressive conditions.

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Section: Materials Of Construction For the Waste Tanks And Transfer Lmentioning

confidence: 99%

Section: Materials Of Construction For the Waste Tanks And Transfer Lmentioning

confidence: 99%