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.
Division Spotlight
Fuel Cycle & Waste Management
Devoted to all aspects of the nuclear fuel cycle including waste management, worldwide. Division specific areas of interest and involvement include uranium conversion and enrichment; fuel fabrication, management (in-core and ex-core) and recycle; transportation; safeguards; high-level, low-level and mixed waste management and disposal; public policy and program management; decontamination and decommissioning environmental restoration; and excess weapons materials disposition.
Meeting Spotlight
Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
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
Jul 2024
Jan 2024
Latest Journal Issues
Nuclear Science and Engineering
August 2024
Nuclear Technology
Fusion Science and Technology
Latest News
Four million nuclear jobs by 2050: Who will do them?
Industry leaders from around the globe met this month to discuss the talent development that will be necessary for the long-term success of the nuclear industry.
The International Conference on Nuclear Knowledge Management and Human Resources Development, hosted by the International Atomic Energy Agency, was held in Vienna earlier this month. Discussed there was the agency’s forecast for nuclear capacity to more than double—or hopefully triple—by 2050 and the requirement of more than four million professionals to support the industry.
Jerry E. Dick, Vijay I. Nath, Erl Kohn, Thomas K. Min, Soedi Prawirosoehardjo
Nuclear Technology | Volume 90 | Number 2 | May 1990 | Pages 155-167
Technical Paper | Nuclear Safety | doi.org/10.13182/NT90-A34411
Articles are hosted by Taylor and Francis Online.
The CANDU-6 nuclear reactor is a 600-MW(elec-tric) channel reactor in which natural uranium fuel is located in channels and surrounded by three separate water systems containing a total of ∼900 000 kg of water. Its four steam generators contain an additional 129000 kg of water. A recent study of a dominant core melt category indicates that this abundance of water effectively retards the melt progression and mitigates accident consequences. The inventory of all three water systems plus that of the steam generators must boil off before the core’s calandria vessel is breached. The steam produced from this boiloff vents to the containment atmosphere where it enhances passive heat removal on surfaces, promotes rapid aerosol settling by condensation on airborne particles, and reduces the concentration and flammability of the hydrogen generated. Breach of the calandria vessel allows molten core to enter a thick-walled concrete calandria vault. The resulting core/concrete reaction penetrates the calandria vault floor ∼2½ days after the beginning of the accident. Core debris, well diluted by decomposition products, then falls into an estimated 2 000 000 kg of water in the reactor basement. This water quenches and disperses the debris and essentially terminates the event sequence. Continuing decay heat is dissipated by minor steaming and by heat transfer through the basement floor and walls into the surrounding bedrock.