LOT 110.02 Safety Limits

Question 1

• LCO 2.1.2 RCS Pressure*
• • *

When is LCO 2.1.2 RCS Pressure Applicable?

Answer 1

MODES 1 - 5

Question 2

• LOT 110.02 Safety Limits*
• • *

What are the bases for the different regions of the Reactor Core Safety Limits - 4 Loops in Operation COLR graph (T_avg vs RTP)?

Answer 2

Flat Region (Green)

Ensures that no bulk boiling will occur at the core exit so that the OPΔT and OTΔT trips remain functional

Steep Region (Pink)

Assures that DNB does not occur (DNBR is maintained >1.52)

Question 3

• LCO 2.1.1 Reactor Core Safety Limits*
• • *

What are your ≤ 1 hour action(s) if the combination of RTP, P_PZR, and highest operating loop T_avg exceed their limits?

Answer 3

• LCO 2.1.1 Reactor Core Safety Limits*
• Action A*
• • *

Be in MODE 3 [1 hr]

Question 4

• LCO 2.1.2 RCS Pressure*
• • *

What is the RCS pressure limit per Tech Specs?

Answer 4

2735 psig

2485 psig x 110%

Question 5

• LCO 2.1.2 RCS Pressure*
• • *

What are your ≤ 1 hour action(s) if the RCS Pressure Limit is exceeded?

Answer 5

MODES 1-2

Be in MODE 3 [1 hr]

Lower RCS pressure < Limit [1 hr]

MODES 3-5

Lower RCS pressure < Limit [5 mins]

Question 6

• LCO 2.1.1 Reactor Core Safety Limits*
• • *

What is the DNBR Limit and the Peak Centerline Temperature Limit?

Answer 6

DNBR Limit

≥ 1.17

Peak Centerline Temperature

< 5080 ˚F

Lowers 58 ˚F / 10,000 MWD/MTU Burnup

Question 7

• LCO 2.1.1 Reactor Core Safety Limits*
• • *

When is LCO 2.1.1 Reactor Core Safety Limits Applicable?

Answer 7

MODES 1 - 2