biological shield

The biological shield consists of a concrete wall, with a 14-ton door for personnel access.

It took forty-five minutes to finish setting the charges atop the biological shield.

There was a biological shield made of concrete mixed with metal shavings.

Finding the leak required breaking through the concrete and metal biological shield with sledgehammers.

The tank, sand layer, and concrete of the reactor pit serve as additional biological shields.

It serves as part of the biological shield and for thermal insulation of the reactor space.

- The two circle segments ('leaves') are the biological shield to protect the workers and the environment.

In the older steel pressure vessel design, boilers and gas ducting are outside the concrete biological shield.

The biological shielding complex was heavily modernized and re-certified by the State Commission.

Even assuming biological shielding were provided to protect the passengers, some of the energy would inevitably heat the vehicle, and may thereby prove limiting.

Eight days after the meltdown the melt penetrated the lower biological shield and spread on the reactor room floor, releasing radionuclides.

In designing an effective biological shield, proper attention must be made to the linear energy transfer of the particles as they propagate through the shield.

Temperatures were becoming extreme (one thermocouple registered 1,300 C) and the biological shield around the stricken reactor was now in severe danger of collapse.

This is an important indicator of the magnitude of the problems associated with neutrons like radiation damage, biological shielding, remote handling, and safety.

The Upper Biological Shield was slanted, jammed into the reactor shaft; a blue and red fire raged in the hole.

Still on top of the concrete biological shield, they used tape measures and chalk while the man in charge consulted a sheet of paper in his hand.

Masonite and steel plates enclose the thermal shield on its top and sides, forming a biological shield for radiation protection.

The biological shields are 100 feet (30.5 metres) high and vary between 10 and 14 feet (3 and 4.3 metres) thick.

The term 'biological shield' refers to a mass of absorbing material placed around a reactor, or other radioactive source, to reduce the radiation to a level safe for humans.

A further threat to the shelter is the concrete slab that formed the "Upper Biological Shield" (UBS), situated above the reactor prior to the accident.

Successful aneutronic fusion would greatly reduce problems associated with neutron radiation such as ionizing damage, neutron activation, and requirements for biological shielding, remote handling, and safety.

Fuel pellets, Fuel-Rod casings, reactor pressure vessel, biological shield, steel containment structure and the outer ferro concrete mantle are six of the most important passive safety features.

Many new features like D-T plasma, Test Blanket Module, Biological shielding and an improved divertor will be incorporated in SST-2.

This low power means that within a few hours of shutdown, it is safe for personnel to enter the biological shield, as the residual radioactivity of the core has decayed to safe levels.

Loop type, in which the primary coolant is circulated through primary heat exchangers outside the reactor tank (but inside the biological shield due to radioactive sodium-24 in the primary coolant)