decay heat


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decay heat

[di′kā ‚hēt]
(nucleonics)
Heat produced by the decay of radioactive nuclides.
References in periodicals archive ?
The MELCOR decay heat package models the decay heat power resulting from the radioactive decay of fission products.
The traditional emergency water supply system has been upgraded to become an enhanced emergency heat removal system, operating as an alternate heat sink for residual decay heat following postulated low-probability accidents that render normal heat sinks unavailable.
The combination of the CMT/PRHR would allow for the passive safety-related functions of decay heat removal, shutdown criticality control, and the initial stages of reactor coolant inventory addition to be accomplished using a single component.
In this study thermal assessment of new design heavy concrete casks of CONSTOR[R] RBMK-1500/M2 type is presented for a some, even though very unlikely, but hypothetically possible abnormal conditions--when the cask becomes leaky and looses helium filler, when the cask is erroneously loaded with inner basket containing SNF of the highest enrichment (having maximum decay heat power), and when the ventilation regulation system of the storage hall fails to open shutter grids for a long period of time under extremely hot weather conditions.
This is attained by promptly stopping chain reactions during any emergency, with continuous cooling of the decay heat of fuels, and confining all radioactive materials.
Until the decay heat sufficiently diminishes, a source of electricity is needed to operate pumps and circulate water in the reactor.
The PFBR subsystems identified for simulation are Neutronics System, Primary Sodium System, Secondary Sodium System, Decay Heat Removal System, Steam Water System, Electrical Systems, Instrumentation & Control systems, Core Temperature Monitoring System and Fuel Handling Operation.
And there are standards helping the industry deal with tricky technical problems--take ISO 10645:1992 on calculating the decay heat power in nuclear fuels within light water reactors.
He closely analyzes the space-dependent and space-independent dynamics of FLUBER systems and details the passive removal of post-shutdown decay heat and also describes future research that needs to be done before the systems are fully ready for construction.
The combined neutron, gamma, and beta decay heat load on the methane moderator is expected to be on the order of 1 W when the facility is operated at its full power of 30 kW.
It also has a passive supplementary air-cooling system, used to remove of residual decay heat.
This would seem to be a further argument for underground siting of modules with individual secondary containments; these would have to dissipate decay heat to the surroundings while allowing refuelling and maintenance equipment to traverse across a row of modules at ground level, carrying their own temporary containment barriers.