AR (Air Removal)

Question 1

In which of the following conditions would the Air Removal system be in ‘hogging’ mode?

A. During normal operation
B. Automatically on low condenser backpressure
C. When one of the Air Removal pumps is secure
D. Establishing condenser vacuum during start-up

Answer 1

D. Establishing condenser vacuum during start-up

Question 2

Seal Water make up is provided to the Air Removal pumps by:

A. Domestic Service Water
B. Demineralized Water
C. Condensate Discharge Header
D. Condensate Service Header

Answer 2

D. Condensate Service Header

Question 3

Unit 1 is in Mode 1 100% power
Due to Plant Multiplexer problem at the cooling towers several fans have been secured.
A Vacuum breaker to the ‘C’ Condenser shell has begun to leak by.
Condenser vacuum is as follows:
A Shell = 3.8” HgA
B Shell = 4.2” HgA
C Shell = 5.8” HgA
Which of the following accurately describes the plant response?

A. ‘D’ Air Removal Pump ARN-P01D will auto start and align to all condenser shells; SBCS will generate a Condenser Interlock
B. ‘D’ Air Removal Pump ARN-P01D will auto start and align to ‘C’ condenser Shell ONLY; SBCS will generate a Condenser Interlock
C. ‘D’ Air Removal Pump ARN-P01D will auto start and align to all condenser shells; SBCS will NOT generate a Condenser Interlock
D. ‘D’ Air Removal Pump ARN-P01D will auto start and align to ‘C’ condenser shell ONLY; SBCS will NOT generate a Condenser Interlock

Answer 3

D. ‘D’ Air Removal Pump ARN-P01D will auto start and align to ‘C’ condenser shell ONLY; SBCS will NOT generate a Condenser Interlock

(Note: 2 of 3 shells for Condenser Interlock of 5.5”HgA)