Leak detection system

A dual secondary loop cooling system comprising:

• a primary heat exchanger including a coolant inlet and a coolant outlet;
• a refrigeration module including a module housing surrounding a first heat exchanger coil fluidically connected to the coolant outlet of the primary heat exchanger and the coolant inlet of the primary heat exchanger, a second heat exchanger coil, and a refrigeration circuit that fluidically connects the first heat exchanger coil with the second heat exchanger coil;
• and
• a leak detection system fluidically connected to the primary heat exchanger, the leak detection system including:
• a coolant reservoir including a coolant holding portion configured to store coolant for the dual secondary loop cooling system and a gas holding portion;
• a reservoir inlet fluidically connected to the gas holding portion and the coolant inlet of the primary heat exchanger;
• a reservoir outlet fluidically connected to the coolant holding portion and the coolant outlet of the primary heat exchanger;
• and
• a pressure relief valve including a valve inlet fluidically connected to the coolant holding portion and a pressure relief outlet, the pressure relief valve being configured to respond to pressure in the gas holding portion to vent coolant from the coolant holding portion through the pressure relief outlet without venting gas from the gas holding portion.