[Kimura and Yasui]

  As the temperature of EYC's 8K shield increased, nitrogen trapped on the shield surface was thought to have been released.

As a result, the pressure near Y-30 increased and exceeded the threshold value, causing the interlock device for GVetmx to operate and GVetmy to close.
After confirming that the gas released by Q-mass was nitrogen, the operating threshold of the GVetmx interlock device was changed to 1.2 x 10^-5 Pa.

 The operating threshold before the change was 9.6 x 10^-6 Pa.