FUN 2 EO: 1.4-k - Radiation Protection Tech.

FUN 2 EO: 1.4-k

1 / 12

What ensures that containment can be isolated in the BWR Main Steam System?

Moisture Separators

Safety Relief Valves

Steam Dryer

Main Steam Isolation Valves (MSIV)

2 / 12

Which containment design consists of a drywell and a wetwell (suppression pool)?

Mark I and Mark II

Mark II and Mark III

Only Mark I

Only Mark III

3 / 12

What is the main function of the suppression pool in the Mark III containment design?

To support the drywell

To provide a heat sink

To confine fission products

To rapidly condense directed steam

4 / 12

What surrounds the reactor vessel and recirculation loops in the Mark I containment design?

Steam Dryer

Suppression chamber

Drywell

Emergency core cooling systems

5 / 12

What is the purpose of the Main Steam System in BWR?

To condense steam from the reactor

To prevent fission products from escaping

To direct the flow of steam from the reactor to the main turbine and other equipment

To support the floor slabs of the reactor building

6 / 12

In the Mark III containment, what is the role of the drywell?

To provide a heat sink

To store the spent fuel

To serve as the main steam system

To confine steam during a pipe rupture and direct it into the suppression pool

7 / 12

What radiological hazard does steam in the Main Steam System pose due to short-lived isotopes?

It causes high radiological conditions needing control for Locked High Radiation Areas

It causes torsional strain along the Main Turbine Shaft

It condenses rapidly inside the pipes

It emits low energy gamma photons

8 / 12

What is the principal contributor to dose rates in the first minute that the steam is in the system?

MSIV

Safety Relief Valves

Steam Dryer

N-16

9 / 12

How quickly are MSIVs designed to fail closed to stop the flow of steam?

10 to 15 seconds

30 to 45 seconds

1 to 2 minutes

3 to 5 seconds

10 / 12

In the event of over-pressurization, where do Safety Relief Valves and Emergency Relief Valves exhaust to?

Suppression pool, Torus, or containment

Wetwell

Main Turbine

Reactor vessel

11 / 12

In the Mark II containment design, what is the drywell topped by?

A concrete slab

An elliptical steel dome

A moisture separator

A suppression pool

12 / 12

What is the main purpose of primary containment in Boiling Water Reactor Containments?

To control torsional strain along the Main Turbine Shaft

To contain fission products from a loss of coolant accident and prevent exceeding offsite radiation doses

To store the reactor's spent fuel

To generate steam

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