A Structural Integrity Evaluation of the Tank Farm Waste Transfer System

Wiersma, Bruce J.

doi:10.2172/1039411

Cited by 4 publications

(8 citation statements)

References 8 publications

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“… ( a ) Pitting corrosion in carbon steel [ 109 ]; ( b ) stress crack corrosion on carbon steel [ 110 ]; ( c ) crevice corrosion on a bolt [ 111 ]. …”

Section: Figurementioning

confidence: 99%

Review of Current Guided Wave Ultrasonic Testing (GWUT) Limitations and Future Directions

Olisa

Khan

Starr

2021

Sensors

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Damage is an inevitable occurrence in metallic structures and when unchecked could result in a catastrophic breakdown of structural assets. Non-destructive evaluation (NDE) is adopted in industries for assessment and health inspection of structural assets. Prominent among the NDE techniques is guided wave ultrasonic testing (GWUT). This method is cost-effective and possesses an enormous capability for long-range inspection of corroded structures, detection of sundries of crack and other metallic damage structures at low frequency and energy attenuation. However, the parametric features of the GWUT are affected by structural and environmental operating conditions and result in masking damage signal. Most studies focused on identifying individual damage under varying conditions while combined damage phenomena can coexist in structure and hasten its deterioration. Hence, it is an impending task to study the effect of combined damage on a structure under varying conditions and correlate it with GWUT parametric features. In this respect, this work reviewed the literature on UGWs, damage inspection, severity, temperature influence on the guided wave and parametric characteristics of the inspecting wave. The review is limited to the piezoelectric transduction unit. It was keenly observed that no significant work had been done to correlate the parametric feature of GWUT with combined damage effect under varying conditions. It is therefore proposed to investigate this impending task.

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“… ( a ) Pitting corrosion in carbon steel [ 109 ]; ( b ) stress crack corrosion on carbon steel [ 110 ]; ( c ) crevice corrosion on a bolt [ 111 ]. …”

Section: Figurementioning

confidence: 99%

Review of Current Guided Wave Ultrasonic Testing (GWUT) Limitations and Future Directions

Olisa

Khan

Starr

2021

Sensors

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“…A literature review for the performance of MOCs for the transfer lines and the key unit operations for the Recycle Diversion (RD) process under various environments and conditions has indicated that there are at least four principal mechanisms of concern: corrosion [8], [10], erosion [10], [11], erosion-corrosion [12], and fatigue [13], [14]. A brief description of each mechanism is presented in the following sections.…”

Section: Degradation Mechanismsmentioning

confidence: 99%

“…The potential for corrosion and erosion-corrosion of transfer lines exposed to the current DWPF recycle stream has been previously reviewed [8]. The assumptions for that evaluation regarding chemistry and characteristics of the solids were reviewed and compared with the anticipated chemistry and solids for the diverted recycle stream.…”

Section: Introductionmentioning

confidence: 99%

An Assessment of the Materials of Construction for the Transfer Lines and Unit Operations Equipment Associated with the Recycle Diversion Process

Wiersma

2021

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“…The presence of these microbes in the water may expose the carbon steel tank and transfer lines to an environment that results in microbiologically induced corrosion (MIC). Although, thus far only cooling water systems have demonstrated susceptibility to MIC at SRS [36], this is a mechanism that is acknowledged as possible in the tank farm facilities if water accumulates in low points. A review of the transfers between the tanks indicated both the tanks and the transfer line piping associated with the near vicinity of AP-106 is constructed of carbon steel.…”

Section: Raw Water Corrosion Ratesmentioning

confidence: 99%

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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A Structural Integrity Evaluation of the Tank Farm Waste Transfer System

Cited by 4 publications

References 8 publications

Review of Current Guided Wave Ultrasonic Testing (GWUT) Limitations and Future Directions

Review of Current Guided Wave Ultrasonic Testing (GWUT) Limitations and Future Directions

An Assessment of the Materials of Construction for the Transfer Lines and Unit Operations Equipment Associated with the Recycle Diversion Process

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

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