1. SCOPE

1.1 This procedure provides instructions for making available and placing in service Auxiliary Building general (non safeguards) ventilation equipment, including switchgear ventilation.

1.2 This procedure does NOT contain instructions for making available and placing in service Auxiliary Building Safeguards Ventilation (ABVS) equipment.

2. DISCUSSION

2.1 ABSVS is normally in service continuously. However, if part or all of the system is shut down for maintenance, sections of this procedure should be used to return it to service.

2.2 ABSVS consists of two sets of supply and exhaust fans.

2.3 Occasionally, due to weather conditions or equipment malfunctions, combating high or low temperatures in one or more rooms served by this system becomes necessary.

3. RESPONSIBILITIES

3.1 Operations personnel are responsible for operation of equipment in accordance with this procedure.

4. PREREQUISITES

4.1 Prior to placing ABSVS in service, ensure that applicable portions of the following equipment are energized:

• 480V vital buses
• 480V non vital buses
• 120V instrument AC distribution panels
• 125V DC distribution panels

5. PRECAUTIONS AND LIMITATIONS

5.1 Motors on equipment operated in this procedure are rated at 50 hp or less. Frequent starting without running time or idle time to permit cooling should be avoided.

5.2 Do NOT turn on redundant supply fans or redundant exhaust fans at the same time.

5.3 When manually operating exhaust fans, check local backdraft dampers for proper positioning.

  ADDITIONAL JOB INFORMATION

• Operational Experience
• Procedure-H1, section 6.2
• Mode Control Switch
• ON/OFF Controller
• Example of Marked-up PI&D
• Example of Expected As Left State

1. SCOPE

1.1 This procedure provides instructions for swapping the operating pump, the in-service heat exchanger (HX), or both, when the System is in single-pump, single-HX operation.

1.2 When placing a standby component in operation, this procedure places the opposite train component into standby, and does NOT remove it from service. REFER TO PROCEDURE-123, "Shutdown and Clearing", to remove a pump from service.

1.3 This procedure does NOT contain directions for establishing or restoring from two-HX operation. REFER TO PROCEDURE-12, "Two Heat Exchanger Operation", to establish or secure from System alignments using two HXs.

2. DISCUSSION

2.1 Swapping pumps and HXs is normally done to equalize operating hours of redundant equipment. This practice provides for more effective surveillance of equipment performance and reliability.

3. RESPONSIBILITIES

3.1 Operations personnel are responsible for operation of equipment in accordance with this procedure.

4. PREREQUISITES

4.1 Ensure that the System is aligned for normal operation PER PROCEDURE-1, "Make HX Available."

5. PRECAUTIONS AND LIMITATIONS

5.1 Pump motor starting frequency shall not exceed the following limits:

• • Three starts at any desired interval in any 15-minute period provided motor runs 10 minutes during the period.
• • Three starts in any 30-minute period if the motor does not run between starts. If a motor trips out on overcurrent, this should be counted as two starts.

5.2 Starting or stopping a pump may result in a low pressure auto-start of a pump on the opposite unit. This is believed to be caused by a pressure wave which is transmitted to the opposite unit via the unit crosstie valve.

  ADDITIONAL JOB INFORMATION

• Operational Experience
• Procedure-1, Make HX Available
• Procedure-12, Two Heat Exchanger Operation
• Procedure-123, Shutdown and Cleaning
• Example of Marked-up PI&D
• Mode Selector Switch