B2103 - RPV temperature instrumentation

Question 1

What is the purpose of the RPV temp instrumentation?

Answer 1

Monitors RPV water and metal temps during normal ops, start-up, shutdown, and post accident conditions

Question 2

When does the bolt up temp alarm come on?

Answer 2

75 deg F

Question 3

What is the lowest temp you can bolt the head on the Rx?

Why?

Answer 3

70 deg F

Because bolt up tension on metal colder than 70 deg F could cause cracking

Question 4

Where is temp taken for thermal interlocks?

Answer 4

Dome pressure converted to temp (condensing chamber)

Question 5

Where is core thermal power calculated from?

Answer 5

Feedwater temp calculation by cyclops computer

Question 6

What are the cavitation interlocks for Recirc pump?

Answer 6

Narrow – < 7.4 delta T between dome and suction

(downshift)

Question 7

What are the thermal interlocks for recirc pump?

Answer 7

Wide – > 50 deg F loop to loop or loop to dome,
> 100 deg F dome to drain

These prevent start or upshift

Question 8

What is the purpose of the reactor head vent?

Answer 8

to vent non-condensables during heat up and start up

Question 9

Where does the reactor head vent vent to?

Answer 9

Drywell equipment drain sump

Question 10

What does the “ADS/SRV LEAK HI” mean?

Answer 10

the head vent to drywell eq drain sump is indicating >155 deg F

Question 11

What should be done < 190 deg F head vent to drywell eq drain sump temp?

Answer 11

swap to Main Steam line A