N62 Condenser Air Removal

Question 1

When does condensate begin to inject into the vacuum pumps

and why?

Answer 1

24 inches Hg

Keeps the discharge temp below 350°f

Question 2

What will close the F003 A/B and why?

Answer 2

Low steam flow condition of less than 7580 Ibm/hr at the second stage SJAE

Prevent exceeding 4% hydrogen

Question 3

What’s the purpose of condenser air removal?

Answer 3

Achieve and maintain vacuum in the main condenser

Question 4

Where does the SJAE receive steam from?

Answer 4

Equalizing header

Question 5

What’s the purpose of the loop seal?

Answer 5

Prevents non-condensibles from leaking back into the condenser

Question 6

What are the mechanical vacuum jump trips?

Answer 6

350°F high discharge temperature - immediately stops
Main Steam Line HiHi radiation (trips to dryout)
26 inches Hg main condenser vacuum (trips to dryout)
Loss of voltage
Motor Protection

Question 7

What channels of rad monitors will trip it?

Answer 7

A or C

Question 8

What group isolations are associated with vacuum pumps?

Answer 8

Group 10

3x normal full power background on main steam line rad

Question 9

Does the mechanical vacuum pump realign to condenser if it trips to dryout?

Answer 9

Yes

Question 10

When is sjae placed into service?

Answer 10

500 - 800 psig

Question 11

What cools the intercondenser?

Answer 11

PSW

Question 12

Where does the 1st stage SJAE discharge to?

Answer 12

Intercondenser

Question 13

Where does the 2nd stage SJAE discharge to?

Answer 13

Offgas

Question 14

At what power are the mechanical vacuum pumps secured and why?

Answer 14

5% due to inadequate hold time and hydrogen build up in the turbine building

Question 15

How long do the mechanical vacuum pumps run in dryout mode?

Answer 15

15 minutes

Question 16

What cools the mechanical vacuum pumps cylinder and head jackets?

Answer 16

PSW