How many vertical ports are there and where do they connect?

How many vertical ports are there and where do they connect?

• A. Two vertical ports; one connects to the core, one to the shield tank.
• B. Three vertical ports; all connect to the center of the core.
• C. Four vertical ports; connected to various radial positions.
• D. Three vertical ports; all connect to the outer region of the core.

Answer: (B)

Vertical ports are used to bring instrumentation or sampling lines into the reactor core to monitor conditions. They’re placed so the data reflect the core’s actual operating state, with the center of the core being the most representative location because it sits between radial gradients and is where the neutron flux is most significant. Having three vertical ports arranged to connect to the center provides symmetric access to the central region, giving measurements that aren’t biased by a single location or by edge effects. This setup helps ensure the data accurately represent the core’s overall behavior rather than peripheral conditions. Choosing fewer than three would limit coverage of the central region, while more ports or connections to outer regions would skew readings toward peripheral conditions or add unnecessary complexity.

Vertical ports are used to bring instrumentation or sampling lines into the reactor core to monitor conditions. They’re placed so the data reflect the core’s actual operating state, with the center of the core being the most representative location because it sits between radial gradients and is where the neutron flux is most significant.

Having three vertical ports arranged to connect to the center provides symmetric access to the central region, giving measurements that aren’t biased by a single location or by edge effects. This setup helps ensure the data accurately represent the core’s overall behavior rather than peripheral conditions.

Choosing fewer than three would limit coverage of the central region, while more ports or connections to outer regions would skew readings toward peripheral conditions or add unnecessary complexity.