S
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- Safeguards
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The material control and accounting program which controls the enriched nuclear material. As used by the International Atomic Energy Agency, this term also means verifying that the peaceful use commitments made in binding nonproliferation agreements, both bilateral and multilateral, are honored.
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Safety Relief Valve
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Safety Assessment Section
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SAS
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The Safety Assessment Section works with international experts to develop new and revise existing safety standards, with the goal to assist the IAEA Member States in achieving and maintaining a high level of safety. To complement the IAEA Safety Standards, the Section also provides technical safety review services to Member States.
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Severe Accident
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Accident more severe than a design basis accident and involving significant core degradation.
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Severe Accident Management
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SAM
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The taking of a set of actions during the evolution of a severe accident, it includes measures to:
- Terminate the progress of core damage once it has started;
- Maintain the integrity of the containment as long as possible;
- Minimize releases of radioactive material.
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Severe Accident Management Guideline
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SAMG
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If an accident occurs at a nuclear power plant, to restore safety, two types of accident management guidance document are typically used: emergency operating procedures (EOPs) for preventing fuel rod degradation, and severe accident management guidelines (SAMGs) for mitigating significant fuel rod degradation when a severe accident is imminent.
The development of SAMGs is an essential part of the severe accident management programme.
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Severe Accident Management Guideline Development Toolkit
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SAMG-D
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The SAMG-D describes the elements necessary to develop a full package of Severe Accident Management Guidelines, which serve to achieve the main goals of severe accident management at a Nuclear Power Plant.
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Shutdown
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The cessation of operation of a facility.
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Single failure
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A failure which results in the loss of capability of a single system or component to perform its intended safety function(s) and any consequential failure(s) that result from it. A system is designed against a single failure if it is capable of performing its task in the presence of any single failure.
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Spent Fuel
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SF
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1. Nuclear fuel removed from a reactor following irradiation that is no longer usable in its present form because of depletion of fissile material, poison buildup or radiation damage.
2. Nuclear fuel that has been irradiated in and permanently removed from a reactor core.
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Spent Fuel Pool
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SFP
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An underwater storage and cooling facility for spent (depleted) fuel assemblies that have been removed from a reactor.
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Structures, Systems and Components
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SSC
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A general term encompassing all of the elements (items) of a facility or activity which contribute to protection and safety, except human factors.
- The structures are the passive elements: buildings, vessels, shielding, etc.
- A system comprises several components, assembled in such a way as to perform a specific (active) function.
- A component is a discrete element of a system. Examples of components are wires, transistors, integrated circuits, motors, relays, solenoids, pipes, fittings, pumps, tanks and valves.
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