drywell

Unit 1 was prioritized as it had the highest drywell pressure.

The drywell is much smaller than a PWR containment and plays a larger role.

In its lowest, partially underground part is located the 1.7-1.8 m thick steel and concrete pressure suppression drywell.

The reactor would nevertheless remain intact due to the five 30-50 cm thick insoles and the massive drywell.

Sometimes a drywell with a series of gravel layers near the lowest spot in the rain garden will help facilitate percolation.

It is called an "over-under" configuration with the drywell forming a truncated cone on a concrete slab.

The RPS will interpret this pressure increase signal, correctly, as the sign of a break in a pipe within the drywell.

As an emergency measure, operators resorted to injecting seawater into the drywell to cool the reactors, but would also ruin them for future operation.

During the theoretical leakage design basis accident the reactor coolant flashes to steam in the drywell, pressurizing it rapidly.

Additional changes include abstracting the wetwell into a pressure-suppression pool with a weir wall separating it from the drywell.

In the extreme case of a meltdown a further system is entrusted with the integrity of the primary containment by spraying and flooding the drywell.

However, a drywell placed at the lowest spot can become clogged with silt prematurely turning the garden into an infiltration basin defeating its purpose.

In the 1980's, workers found that water used in the refueling of the reactor had leaked onto sections of the drywell, causing corrosion.

By loss of cooling agent in the drywell, the excessive steam will spread into a torus-shaped pressure-suppression pool, where it will condense decreasing the pressure.

Though his basic 20-by-40-foot pool has a $30,850 price, that does not include the coping, which is the rim of the pool, or electrical work or a drywell.

A BWR's containment consists of a drywell where the reactor and associated cooling equipment is located and a wetwell.

Containment variants were constructed using either concrete or steel for the Primary Containment, Drywell and Wetwell in various combinations.

In the Fukushima I reactors the primary containment consists of "drywell" and "wetwell" concrete structures below the top level, immediately surrounding the reactor pressure vessel.

LEAD: The Oyster Creek Nuclear Generating Station, out of service for repairs, reported a water leak today inside the plant's drywell.

Both the drywell and the wetwell are enclosed by a secondary containment building, maintained at a slight sub-atmospheric or negative pressure during normal operation and refueling operations.

The GDCS is a series of very large water tanks located above and to the side of the Reactor Pressure Vessel within the drywell.

The building was purchased by the Drywell Group, LLC in 2006 and they proceeded to renovate and restore the interior and exterior.

Opponents have criticized the thoroughness of the inspections and the effectiveness of the repairs, while AmerGen has argued that both were extensive and that the drywell remains strong.

The Mark I is the oldest, distinguished by a drywell containment which resembles an inverted lightbulb above the wetwell which is a steel torus containing water.

Radiation levels are also notably lower around the lower parts of the "Drywell", suggesting that fuel had not reached the bottom of the containment vessel, or damaged the concrete floor slab.