Equipment Failure Procedure

HA-26 Hydrogen Addition System 10/22/62

A. Hydrogen Pressure On the Bottle In Use Falls Such That SL Surge Tank Pressure cannot Be Maintained. (Pressure indicator PI-HA2 or PI-HA4)

• 1. Close the manifold shut off and bottle shut off valves.
• 2. Disconnect empty bottle and replace it with a full bottle.
• 3. Should the last available hydrogen bottle become depleted shutdown the reactor when SL surge tank pressure drops below the low pressure alarm.

B. Hydrogen Pressure Controller Becomes Inoperative

• 1. Close the pressure regulators isolation valves and the bottle shut off valve and tag the valves.
• 2. Switch to the standby bottle and pressure regulator.
• 3. Make the necessary repair to the regulator.

C. If Excessive Flow Shut Off Valve Fails In Closed Position

• 1. Operate the bypass valve HA-22V manually while supplying hydrogen to the buffer seal system surge tank.
• 2. Subsequently, isolate the excessive flow shut off valve and perform the necessary repair.