Nuclear technologies have important distinctions and potential advantages for large-scale generation of hydrogen for U.S. energy services. Nuclear hydrogen requires no imported fossil fuels, results in lower greenhouse-gas emissions and other pollutants, lends itself to large-scale production, and is sustainable. The technical uncertainties in nuclear hydrogen processes and the reactor technologies needed to enable these processes, as well waste, proliferation, and economic issues must be successfully addressed before nuclear energy can be a major contributor to the nation's energy future. In order to address technical issues in the time frame needed to provide optimized hydrogen production choices, the Nuclear Hydrogen Initiative (NHI) must examine a wide range of new technologies, make the best use of research funding, and make early decisions on which technology options to pursue. For these reasons, it is important that system integration studies be performed to help guide the decisions made in the NHI. In framing the scope of system integration analyses, there is a hierarchy of questions that should be addressed: What hydrogen markets will exist and what are their characteristics? Which markets are most consistent with nuclear hydrogen? What nuclear power and production process configurations are optimal? What requirements are placed on the nuclear …

The nuclear waste package design for Yucca Mountain (Nevada, USA), in its current configuration, consists of a double wall cylindrical container fabricated using a highly corrosion resistant Ni-based Alloy 22 for the outer barrier and type 316 stainless steel for the inner structural vessel. A mailbox-shaped drip shield fabricated primarily using Ti Grade 7 will cover the waste packages. The environmental degradation of the relevant materials have been extensively studied and modeled for over ten years. This paper reviews the state-of-the-art understanding of the degradation modes of Alloy 22 (N06022) due to its interaction with the predicted in-drift mountain conditions including temperature and types of electrolytes. Subjects discussed include thermal aging and phase stability, dry oxidation, general and localized corrosion, stress corrosion cracking and hydrogen induced cracking.

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A corrosion engineering information system was created to manage, correlate and predict corrosion of alloys and also to use thermochemical calculations to predict the occurrence of dominant corrosion mechanisms in hot gases found in many different chemical processes and other related industrial processes.

Alloy 22 is a nickel base alloy highly resistant to all forms of corrosion. In conditions where tight crevices exist in hot chloride containing solutions and at anodic potentials, Alloy 22 may suffer crevice corrosion, a form of localized attack. The occurrence (or not) of crevice corrosion in a given environment (e.g. salt concentration and temperature), is governed by the values of the critical potential (E{sub crit}) for crevice corrosion and the corrosion potential (E{sub corr}) that the alloy may establish in the studied environment. If E{sub corr} is equal or higher than E{sub crit}, crevice corrosion may be expected. In addition, it is generally accepted that as Alloy 22 becomes passive in a certain environment, its E{sub corr} increases and its corrosion rate (CR) decreases. This paper discusses the evolution of E{sub corr} and corrosion rate (CR) of creviced Alloy 22 specimens in six different mixtures of sodium chloride (NaCl) and potassium nitrate (KNO{sub 3}) at 100 C. The effect of immersion time on the value of E{sub crit} was also determined. Two types of specimens were used, polished as-welded (ASW) and as-welded plus solution heat-treated (ASW+SHT). The latter contained the black annealing oxide film on the surface. Results …

This report deals with the impact of fabrication processes on the localized corrosion behavior of Alloy 22 (N06022). The four fabrication processes that were analyzed are: (1) Surface stress mitigation of final closure weld, (2) Manufacturing of the mockup container, (3) Black annealing of the container and (4) Use of different heats of Alloy 22 for container fabrication. Immersion and Electrochemical tests performed in the laboratory are generally aggressive and do not represent actual repository environments in Yucca Mountain. For example, to determine the intergranular attack in the heat affected zone of a weldment, tests are conducted in boiling acidic and oxidizing solutions according to ASTM standards. These solutions are used to compare the behavior of differently treated metallic coupons. Similarly for electrochemical tests many times pure sodium chloride or calcium chloride solutions are used. Pure chloride solutions are not representative of the repository environment. (1) Surface Stress Mitigation: When metallic plates are welded, for example using the Gas Tungsten Arc Welding (GTAW) method, residual tensile stresses may develop in the vicinity of the weld seam. Processes such as Low Plasticity Burnishing (LPB) and Laser Shock Peening (LSP) could be applied locally to eliminate the residual stresses produced by welding. …

A photograph of a smiling cyclist in sunglasses in the official LSR cycling jersey and black shorts appears turned over his shoulder to the camera while sitting at a table with others. The cyclist's jersey displays handwritten names along the side and the shoulder area reading "Jason" and "Jody and Erin Secker". The table is located in a grassy wooded park with massage tables set up around the area. A woman in a white LSR t-shirt, blue lanyards, and white and red baseball cap stands looking to the left in the background.

Photograph of two women sitting on the steps of a white stone building taking a smoke break while they smile at the camera. Both women wear the yellow, blue, and red LSR cycling jersey. Behind them, hung on the top edge of the building's door is a cut-out of a red and white lifebuoy that says, "Lone Star Ride" with another sign underneath it which says, "Surf's Up!!" featuring a surfing person on a red surfboard above a cresting wave.

Photograph of crew member identified by his name tag as Chris Golden seated and smiling at the camera. Chris appears wearing a blue Lone Star Ride t-shirt, various lanyards, and event manager and ride queen Janie Bushs' costume tiara. In the background are tables with tie-dyed rainbow table cloths set up in a wooded park area.

Photograph of two men with their arms around each other both wearing sunglasses smiling at the camera. The man on the left appears wearing a navy blue Hawaiian shirt, a rainbow lei, and a blue clapper necklace. The cyclist to the right is wearing an official LSR cycling jersey and is holding a yellow Gatorade bottle behind the man on the left.

Photograph of an individual in an orange shirt, sunglasses, black shorts, and a red hat holding a whistle in their mouth. They are standing in a rocky area next to the pavement between two small orange traffic cones. The area beyond the gravel is a shaded wooded area with tangled streamers hanging from the closest trees. A white clapboard/brick building stands slightly obscured just behind the tree line.

Photograph of five cyclists smiling at the camera. Of the group, four are men who all wear matching cycling jerseys and various sunglasses. The woman, top right, wears a blue and yellow cycling jersey that reads "Wild Stallions" with a red do-rag. Bikes lay scattered haphazardly on the grass ground around them. In the background appears a fenced tennis court, scoreboard, and open sports fields.

Photograph of a man riding a bicycle along an unpaved dirt road. The cyclist appears wearing sunglasses, a yellow and red cycling jersey, and a blue and silver marbled helmet. In the background, a playground area with swings and a tan building appears to the left.

Photograph of two male bicyclists riding their bikes through a rocky area just off a paved road. The man in the front appears coming to a stop and wears a red and yellow cycling shirt, a black backpack, and a black helmet with the number "17" marked on the front. The other man appears pedaling to meet the man in the front in a yellow shirt and a black helmet. In the background is a brightly lit open field and playground area bordered by houses.

Photograph of event manager Janie Bush and a crew member in red smiling at the camera, each have an arm around the other. Both women are wearing gold beads and red lanyards. Janie Bush appears on the right in a blue Lone Star Ride shirt and a rhinestone tiara. The woman to the left with the red shirt has her hand on Janie's shoulder and holds a partially eaten banana in her left hand. The photo was taken in a wooded area with a clapboard/brick two-story building to the right.

Photograph of a cyclist and event manager Janie Bush smiling at the camera and with one arm around the other. Janie Bush is wearing a blue Lone Star Ride t-shirt with various beads, lanyards, and name tags while the man wears a blue, yellow, and red LSR cycling shirt with AIDS ribbons on it. The cyclist holds a red helmet in his free gloved hand. Both individuals are seen framed by a grassy shaded wooded area with other cyclists and crew members standing or working in the distant background.

Photograph of a man in a white LSR tank top giving a thigh massage to a rider in a shaded wooded area of a park. The cyclist appears laying down on his back on a purple massage table with his hands curled on his sternum wearing the red, blue, and yellow LSR cycling jersey.

Photograph of a tall male cyclist embracing event manager and ride queen Janie Bush. Bush appears in a light blue LSR t-shirt, a red lanyard, and a rhinestone costume tiara. Cyclist #23 to her immediate right wears a red and white helmet, LSR cycling jersey, and gloves. Both stand in a school parking lot with cars and two individuals talking to the left. Appearing on the edge of the parking lot are stadium lights, stands, and flag poles flying the American and Texas flags.

A photograph of a woman standing next to a paved road and smiling at the camera with the side of her body turned to the camera. She appears wearing a blue LSR t-shirt, jeans, and a pink event bracelet. Across the road, an individual in a red hoodie and denim shorts stands next to a fold-out chair set up on the shoulder of the road. A one-story building appears slightly obscured in the shade of the trees

Photograph of a tall male cyclist and event manager Janie Bush smiling at the camera, each with an arm around the other. The man wears a fitted white cycling jersey and a costume rhinestone tiara. Janie is wearing gold beads, a red lanyard, and a blue LSR t-shirt. The photo was taken in a heavily shaded area with a driveway leading away behind them.

Photograph of a woman smiling at the camera with her arms outstretched, one waving in greeting and the other holding a bottle of Diet Pepsi. She appears leaning against a short wooden post wearing a heather gray LSR hoodie, blue nametag lanyard, and a white LSR baseball cap. In the background is a brightly lit field with trees and parked farm/ construction equipment.

Photograph of five men smiling at the camera and standing in front of a white van with "005" and a rainbow stripe painted on the rear side window. The three men in the center wear white Lone Star Ride shirts and the two others on each end wear blue Lone Star Ride shirts. The man on the far left wears a blue baseball cap and has a headset resting on his right shoulder.

Neosonus concert performed at the UNT College of Music Voertman Hall.

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