Figure 6-1. Use of double valve container

DOE-HDBK-1129-99

After filling the container with

tritium, close V2, open V3,

Container filled

and evacuate the port to the

with Tritium

tritium storage system.

Close V2 and V3 and

monitor for seat leak

across V2

Monitor for V2 seat leak

Close V1

Open V2 and monitor for

seat leak across V1

Monitor for V1 seat leak

Open V3 and evacuate

port to tritium storage

Close V2 and V3 and

remove tritium container and

cap tritium container and

port

FIGURE 6-1. Use of double valve container

This leaves the container in the following condition:

The tritium is trapped inside the container by the first valve, and the valve seat of the first valve

is exposed to tritium during storage or transport.

The space between the first valve and the second valve has been evacuated and contains no

significant quantity of tritium or other gases. The second valve seat is not exposed to tritium

during the storage or transport cycle.

The space between the second valve and the container port cap contains glovebox gas or air

sealed into the void space by the port closure seal.

To make a reconnection to a manifold, the following steps apply:

Before the container is reconnected to a manifold, the two valves are checked by hand to make

sure they are closed.

The port is uncapped and connected to the manifold.

The gas trapped in the space between the port and the manifold is pumped out, and the

connection is leak checked using a helium leak detector calibrated to detect a leak of

< 10-6 cc He/second.