S/G Tube Leak AOP

Question 1

What radiation monitors might alarm during a S/G Tube Leak?

Answer 1

• SRA-1900/2900 (SJAE)
• SRA-1800/2800 (GSLO)
• DRA-300 (S/G Blowdown Sampling)
• DRA-353 (S/G Blowdown Treatment)

Question 2

What conditions during a S/G Tube Leak would require a Rx Trip? (Only a trip)

Answer 2

• VCT level cannot be maintained.
• > 50 gpm leakrate

Question 3

What conditions during a S/G Tube Leak would require a Rx Trip AND SI?

Answer 3

• PZR level cannot be maintained with one charging pump and letdown is isolated.
• > 100 gpm leakrate

Question 4

What conditions during a S/G Tube Rupture would require a shutdown and with what time requirements?

Answer 4

• ≥ 75 gpd leakrate: Be in MODE 3 within 24 hours.
• ≥ 150 gpd leakrate: Be in MODE 3 within 6 hours.
• ≥ 75 gpd, but < 150 gpd and leakrate rate of change exceeds 30 gpd/hr: Reduce power to <50% in 1 hour and MODE 3 within next 2 hours.

Question 5

What is the FOP criteria for S/G Tube Leak? (4022-002-021)

Answer 5

S/G Tube Leakage Criteria: If leakage is equal to or > 100gpm then:
- Trip Rx
- Go to E-0 step 1
- Initiate SI after verification of Rx trip.

Question 6

While isolating steam flow from a S/G with a Tube Leak, what setpoint is the leaking S/G PORV set to and why?

Answer 6

• 1040#
• Minimizes the spread of contamination.

Question 7

While performing S/G Tube Leak (4022-002-021) after the Rx has been shutdown, what criteria will require the operator to initiate SI?

Answer 7

• PZR level cannot be maintained > 7%
  -OR-
• Subcooling < 40F

Question 8

While performing S/G Tube Leak (4022-002-021) after the Rx has been shutdown, what is the cooldown rate limit?

Answer 8

Equal to or < 100F in any one hour period.

Question 9

What is the Tech Spec Limit for S/G Tube Leakage?

Answer 9

Limited to 150 gallons per day through any ONE S/G.