On Monday, March 11 the containment box was removed from TM4 and a vacuum leak check preformed in an attempt to locate the leak in the ground electrode circuit.

Following Pierre's work plain helium was sprayed was the highest joint accessible towards the lowest.

A two second spray of helium was applied to the first joint (the reducer from the service tray to the line that goes to the service tray side of the water block connection), no response from the leak detector after 1 minute.

 two second spray of helium was applied to the braze joint of the servive tray side of the waterblock connection; almost immediate response from the leak detector (see David Wand for actual values for leak rate).

The inital joint at the reducer was rechecked to insure the response was not just a risidual slow response from the reducer joint and confirmed by no response after 2 miniutes that it was not.

The braze joint at the service tray block was then tested again with a two second spray and again almost an imediated response.

A meeting was conveined and decided to pressurize this circuit with air and apply snoop solution to the suspect area to try to identify wether the leak is in the braze joint or possibly c-seal...This will take place on Tuesday, March 12th.