Plant Operating Standard

WL-39 Gaseous Waste Collection System

A. Normal Operations

• 1. Secondary shield area is being continuously purged. See also POS RS-101.
• 2. The lab waste tank, the waste storage tanks, and the inner-bottom tanks are vented to the gaseous waste manifold which is under a constant suction from the reactor compartment ventilation system.
• 3. Air is being continuously evacuated from the sampling station hood.
• 4. The pressurizer is being vented daily for approximately fifteen (15) minutes through WL-1V.
  • a. Vent flow through WL-1V should be approximately 0.3 cfm at 25 gpm letdown flow.
  • b. Letdown flow should not be less than 15 gpm and the letdown temp. should not exceed 130F while pressurizer is venting.
  • c. Due to the pressure drop characteristics of the letdown coolers and the vent piping, pressurizer vent flow can be adjusted or controlled by adjusting letdown flow.
• 5. Primary fluid samples are not to be taken from the sample lone down stream of letdown coolers, if pressurizer vent valve WL-1V is open. See also POS SA-24.
• 6. Containment vessel purge valves are closed.

Minimum Condition for Reactor Operation

• 1. Lower void ventilation as specified in POS RS-101.