Areva - Reference Document 2016

GLOSSARIES 1. Technical glossary

> Nozzle Metal component located at the top (top nozzle) or bottom (bottom nozzle) of a fuel assembly. The top nozzle is used for handling of the assembly. > Nuclear engineering Any activity relating to the design, construction or optimization of nuclear facilities. > Nuclear fuel Material designated by the French Defense Code as requiringmeasures to physically protect them against theft or diversion. > Nuclear island A system encompassing the nuclear steam supply system and the fuel-related facilities, as well as the equipment required for the system’s operation and safety. A “conventional island” consists of the alternating current turbogenerator coupled to the nuclear island, and the equipment required for its operation. p any measure taken by an operator to secure the materials they hold, including monitoring and accounting, containment, surveillance, physical protection of materials and facilities, and protection during transportation; p inspections performed by the State (in France, the Senior Official for Defense and Security) or international agencies such as the IAEA and Euratom to verify the effectiveness and reliability of these measures. In both cases, the purpose of safeguards is to prevent any loss or theft of material, particularly with malicious intent. > Nuclear safety Encompasses all of the technical provisions and organizational measures pertinent to the design, construction, operation, shut-down and dismantling of regulated nuclear facilities (INB), and to the transportation of radioactive materials, and is designed to prevent accidents and limit their consequences. > Nuclear security According to the French Nuclear Safety and Transparency Law of June 13, 2006 (“TSN Law”), nuclear safety includes nuclear safety, radiation protection, prevention and control of acts of malevolence, and emergency preparedness in the event of an accident. In another sense that is closer to the IAEA’s definition, it is the prevention of, detection of and response to the theft, sabotage, unauthorized access and illegal moving of nuclear materials, or any other malicious act concerning nuclear materials, any other radioactive substances, or the facilities containing them. > Nuclear materials safeguards Safeguards are of two kinds: > Nuclear Regulatory Commission (NRC) Counterpart of ASN in the United States. Field of jurisdiction: nuclear safety and radiation protection.

> Nuclear steam supply system (NSSS) A steam production system in which the heat is supplied by a nuclear reactor. In a pressurized water reactor (PWR), the system consists of heavy components (steam generator, pressurizer and reactor vessel), mobile components (reactor coolant pump sets and control rod drivemechanisms), and the piping that connects them. All of these interconnected components circulate hot water and keep it in a liquid state inside the reactor’s primary cooling system. The heat is produced by the fission of atomic nuclei contained in the fuel that is placed in the reactor core, inside the reactor vessel. > OHSAS 18001 standard Occupational health and safety management system specification designed to prevent risk in the workplace. The objective is to provide interested companies with a tool for assessing and certifying their occupational health and safety management systems which is compatible with international management system standards such as ISO 9001 for quality, ISO 14001 for the environment and ILO-OSH 2001 for occupational safety and health. > ONR (Office for Nuclear Regulation) Counterpart of the Autorité de sûreté nucléaire (French nuclear safety authority, ASN) in the United Kingdom. Field of jurisdiction: nuclear safety and radiation protection. > Ore Rock, mineral or combination of minerals containing one or more useful chemical elements at sufficiently high grades and which can be extracted by an industrial process. > Periodic inspection Combination of inspections performed periodically in a facility during a scheduled outage. > Plutonium Chemical element with the atomic number 94 and conventional symbol Pu. Plutonium has many isotopes, the most common of which go from 238 to 242. Plutonium-239, a fissile isotope, is produced in nuclear reactors by neutron capture on uranium-238. > Pressurized nuclear equipment Equipment that is specially designed for nuclear applications and whose failure could give rise to radioactive releases. Pressurized nuclear equipment is classified: p into three levels, from N1 to N3, in particular as a function of the magnitude of radioactive releases that could result from their failure; and p into five categories, from 0 to IV, based on risk, and in particular risk related to the temperature and pressure of the fluids they contain. In France, the order of December 12, 2005, which came into effect on January 21, 2011, establishes the conditions for the marketing of all nuclear equipment and devices.

378

2016 AREVA REFERENCE DOCUMENT