ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Explore membership for yourself or for your organization.
Conference Spotlight
2025 ANS Winter Conference & Expo
November 8–12, 2025
Washington, DC|Washington Hilton
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
Latest Magazine Issues
Oct 2025
Jul 2025
Latest Journal Issues
Nuclear Science and Engineering
December 2025
Nuclear Technology
November 2025
Fusion Science and Technology
Latest News
DNFSB’s Summers ends board tenure, extending agency’s loss of quorum
Lee
Summers
The Defense Nuclear Facilities Safety Board, the independent agency responsible for ensuring that Department of Energy facilities are protective of public health and safety, announced that the board’s acting chairman, Thomas Summers, has concluded his service with the agency, having completed his second term as a board member on October 18.
Summers’ departure leaves Patricia Lee, who joined the DNFSB after being confirmed by the Senate in July 2024, as the board’s only remaining member and acting chair. Lee’s DNFSB board term ends in October 2027.
Youshan Yang, Lusheng Wang
Fusion Science and Technology | Volume 80 | Number 1 | January 2024 | Pages 55-67
Research Article | doi.org/10.1080/15361055.2023.2185045
Articles are hosted by Taylor and Francis Online.
This work aims to investigate the characteristics of the H atom in the tetrahedral interstitial sites of 8f2, 4c1, 8f1, 4c2, 8e, and 8g1 in the ZrCoH3 cell by first principles calculation based on the density functional theory. The research shows that pressure can change the local property of the electrons and the bonding ability of the H atom and its adjacent metal atoms, resulting in changes in the stable point and the disproportion point of the H atom in ZrCoH3. Further research has found that at P = 0 GPa, the significant Co-H covalent bond makes the H atom prefer to occupy the tetrahedral interstitial sites of 8f1 and 4c2 in the ZrCoH3 cell, while the H atom occupying the tetrahedral interstitial site of 4c1 in the ZrCoH3 cell has a significant Zr-H ionic bond with its adjacent Zr atom, which is the reason for the disproportionation of the ZrCoH3 alloy. When P = 10 GPa, the H atoms become unstable in the 8f1 and 4c2 tetrahedral interstices of the ZrCoH3 crystal cell. The significant Zr-H ionic bond between the H atoms in the 8f1 tetrahedral interstice and their adjacent Zr atoms is the reason for the disproportionation of the ZrCoH3 alloy, and the significant Co-H covalent bond makes the H atoms preferentially occupy the 4c1 and 8g1 tetrahedral interstices.