Laser confocal microscope for analysis of 3013 inner container closure weld region

Martínez-Rodríguez, Michael J.

doi:10.2172/1406122

Cited by 6 publications

(21 citation statements)

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“…The FCE containers were sectioned into quarters and the weld removed from each section as described in previous reports [4][5][6]. However, the current nomenclature for the quarter sections follows a clockwise direction starting from the weld overlap (defined as 0°) when facing the interior of the inner container lid as shown in Figure 1.…”

Section: Panoramic Images Of the Iccwr By Stereomicroscopementioning

confidence: 99%

“…These images were assembled into a panoramic view for each section lid and sidewall. These panoramic views of the ICCWR are shown in It was estimated that about 6% of the ICCWR area was lost based on the 6 mm analysis in Zone 3 [6]. It was determined by the MIS Working Group that this container will still be analyzed as scheduled.…”

Section: Panoramic Images Of the Iccwr By Stereomicroscopementioning

confidence: 99%

“…From the sidewall quarter sections of the FCE containers, one quarter section of each container was selected for analysis by SEM/EDS. These sections were selected as the ones showing more corrosion based on the 35 mm pictures of the inner containers lids [6] and the stereo microscope images shown in Appendix A. These sections correspond to FY15 DE07 Section C, FY16 DE05 Section C and FY15 DE08 Section A and are denoted "archive" sections.…”

Section: Sem and Eds Analysismentioning

confidence: 99%

“…The LCM parameters used to collect data for the full circumference were determined in FY17 and are discussed in details in reference [6]. The parameters set during the data collection were the image magnification, measurement area (refers to x-y directions in pixels), quality (related to the laser speed), and pitch (refers to the spacing resolution in the z-direction).…”

Section: Iccwr Full Circumference Examination By Lcm Of Fy15 De07mentioning

confidence: 99%

“…This information will be used to perform a statistical analysis with Los Alamos National Laboratory (LANL) that will help support a determination of how much of an ICCWR needs to be examined in order to make the assertion of whether or not cracking has occurred and develop an ICCWR sampling plan for analysis of subsequent containers. In FY17, the following DE containers were selected for full circumference analysis of the ICCWR with the following prioritization order: FY15 DE07, FY16 DE05, and FY15 DE08 [6]. Revision 0 In FY18 the selected DE containers for full circumference analysis were processed according to the ICCWR protocol described above.…”

Section: Introductionmentioning

confidence: 99%

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Status of the Full Circumference Examination of the Inner Container Closure Weld Region for Selected 3013 DE Container

Martínez-Rodríguez

2018

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One of the main focus areas of the 3013 Surveillance Program is a thorough evaluation of the inner container closure weld region (ICCWR) opened for destructive examination (DE). As part of the protocol to investigate the corrosion in the ICCWR a laser confocal microscope (LCM) is used to perform close visual examination of the surface and measurements of corrosion features on the surface. In FY17, DE containers from FY13 through FY16 were evaluated to select candidates for a full circumference analysis of the ICCWR. In FY18, the selected DE containers for full circumference evaluation (FCE) were processed according to the ICCWR protocol. However, due to the time intensive task for collecting high magnification images for a full circumference, only FY15 DE07 was selected for completion of LCM data collection in FY18 with the remaining DE containers scheduled to be completed in FY19.The ICCWR protocol was completed as follows: (1) the FCE containers were sectioned into quarters and the weld removed to access the ICCWR; (2) a series of images of the ICCWR full circumference were taken using a stereo microscope and assembled into panoramic views; (3) SEM/EDS analysis performed on selected sections showed what is most likely corrosion products on the surface and chlorides randomly dispersed; (4) the presence of chlorides was also confirmed with ion chromatography of citric acid washes, in which FY15 DE07 and FY16 DE05 showed a significant amount of chlorides with FY15 DE08 showing the less amount of chlorides; (5) dye penetrant examination was performed on the interior and exterior surfaces of all the sidewall sections but reveled no relevant indication of surface-breaking defects, (6) finally, as described above, only FY15 DE07 was selected for completion of the full circumference examination of the ICCWR by LCM. Revision 0 close to the region of maximum residual stresses and are very similar to those produced during the boiling MgCl2 tests conducted at SRNL. High humidity and chloride content were present in this DE container which are ideal conditions for crack development. However, gas analysis and statistical evaluation of the gas compositions and pressures via GEST analyses suggest that leakage between the outer/inner (OI) and inner container (IC) volumes was unlikely. Additional characterization and analysis will be performed on the locations where the cracks were found.

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Section: Panoramic Images Of the Iccwr By Stereomicroscopementioning

confidence: 99%

Section: Panoramic Images Of the Iccwr By Stereomicroscopementioning

confidence: 99%

Section: Sem and Eds Analysismentioning

confidence: 99%

Section: Iccwr Full Circumference Examination By Lcm Of Fy15 De07mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Status of the Full Circumference Examination of the Inner Container Closure Weld Region for Selected 3013 DE Container

Martínez-Rodríguez

2018

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FY19 Status of the Full Circumference Examination of the Inner Container Closure Weld Region for Selected 3013 DE Containers

Martínez-Rodríguez

2019

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One of the main focus areas of the 3013 Surveillance Program is a thorough evaluation of the inner container closure weld region (ICCWR) opened for destructive examination (DE). As part of the protocol to investigate the corrosion in the ICCWR a laser confocal microscope (LCM) is used to perform close visual examination of the surface and measurements of corrosion features on the surface. In FY17, DE containers from FY13 through FY16 were evaluated to select candidates for a full circumference analysis of the ICCWR. In FY18, the selected DE containers for full circumference evaluation (FCE) were processed according to the ICCWR protocol and LCM data collection was completed for the full circumference only for FY15 DE07. In FY19 the remaining DE containers were completed.The ICCWR protocol was completed as follows: (1) the FCE containers were sectioned into quarters and the weld removed to access the ICCWR; (2) a series of images of the ICCWR full circumference were taken using a stereo microscope and assembled into panoramic views; (3) SEM/EDS analysis performed on selected sections showed what is most likely corrosion products on the surface and chlorides randomly dispersed; (4) the presence of chlorides was also confirmed with ion chromatography of citric acid washes, in which FY15 DE07 and FY16 DE05 showed a significant amount of chlorides with FY15 DE08 showing the less amount of chlorides; (5) dye penetrant examination was performed on the interior and exterior surfaces of all the sidewall sections but reveled no relevant indication of surface-breaking defects, (6) finally, as described above, the full circumference examination of the ICCWR by LCM was completed.The three ICCWRs show general and localized corrosion on the surface. However, FY15 DE08 show more areas with agglomerated pits in Zones 2 and 3 than the other two DEs. The major suspect corrosion events were observed for FY15 DE07 on Sections C1 and C2 and for FY15 DE08 on Section C2. These events correspond to suspect cracks or crack-like features identified with a unique name to easily refer to each feature. FY15 DE07 shows a crack-like feature, identified as Acrux, in Section C1 and three features 07/25/2019

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Status of the Characterization of DEs from the Full Circumference Examination of the Inner Container Closure Weld Region (FY2020)

Martínez-Rodríguez¹

2020

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One of the main focus areas of the 3013 Surveillance Program is a thorough evaluation of the inner container closure weld region (ICCWR) opened for destructive examination (DE). As part of the protocol to investigate the corrosion in the ICCWR a laser confocal microscope (LCM) is used to perform close visual examination of the surface and measurements of corrosion features on the surface. DE containers from FY13 through FY16 were screened with three candidates selected for full circumference evaluation (FCE) according to the ICCWR examination protocol [1].During the FCE, FY16 DE05 and FY15 DE07 showed suspect major corrosion events [2,3]. FY16 DE05 Section C2 shows two crack-like features, identified as Denebola and Draco. Both features are located at the boundary of Zone 2 and Zone 3. Consequently, Section C2 of FY16 DE05 was selected for examination by serial metallography at Savannah River National Laboratory (SRNL). For FY15 DE07 the suspect corrosion events were observed on Sections C1 and C2. Section C1 shows one crack-like feature, identified as Acrux. Section C2 shows three crack-like features, identified as Bellatrix, Cursa Minor and Cursa Major. Unlike Acrux and Bellatrix, which are located at the boundary of Zone 2 and Zone 3, Cursa Minor and Cursa Major are located in Zone 2. Sections C1 and C2 of FY15 DE07 were sent to Los Alamos National Laboratory (LANL) for characterization by X-Ray Tomography (XRT).Before preparing the sample for the metallographic analysis, the LCM images of FY16 DE05 Section C2 were analyzed using the Image Analysis Software (IAS) developed by LANL [4]. Several suspect corrosion features were identified, labeled as D1 through D6, where D1 corresponds to Denebola and D2 corresponds to Draco. Corrosion features D1 through D6 were characterized by SEM. The SEM image of Denebola (D1) show it is an apparent chipped section on the surface, but more information will be obtained in the future from the cross-section examination. Draco (D2) seems to be a crack with pits along the crack. Corrosion features D3 and D6 are large pits within the grain growth zone close to the weld. For D3, part SRNL-L6000-2020-00057 Page 2 of 16 Revision 0 of the grain boundary can be observed inside the pit, but no apparent crack was identified. For D6, a large separation of the grains can be observed inside the pit which may indicate intergranular corrosion or a crack formation. Corrosion feature D4 does not show visible signs of cracks. Corrosion feature D5 is a large pit with an apparent crack inside. Intergranular and pitting corrosion was observed in most of the images. FY16 DE05 Section C2 was cut into a smaller sample, labeled as Subsection C2a, and mounted for cross-section examination. The specimen was successively ground with finer and finer abrasive media to the first position (885 m from weld edge). SEM images from the 1 st round analysis show pits of different sizes (up to 16 m) and depths (up to 10 m).Initial imaging of FY15 DE07 Section C2 was obtained using XRT at LANL. However, sample geo...

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Laser confocal microscope for analysis of 3013 inner container closure weld region

Cited by 6 publications

References 6 publications

Status of the Full Circumference Examination of the Inner Container Closure Weld Region for Selected 3013 DE Container

Status of the Full Circumference Examination of the Inner Container Closure Weld Region for Selected 3013 DE Container

FY19 Status of the Full Circumference Examination of the Inner Container Closure Weld Region for Selected 3013 DE Containers

Status of the Characterization of DEs from the Full Circumference Examination of the Inner Container Closure Weld Region (FY2020)

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