EOP Tech Specs

Question 1

What technical specification governs the operation of primary coolant pumps and specifically not operating P-50A and P-50B when PCS is less than 300F?

Answer 1

T.S. 3.4.6 PCS Loops - MODE 4

Two loops or trains consisting of any combination of PCS loops and Shutdown Cooling (SDC) trains shall be OPERABLE, and either:

• One PCS loop shall be in operation; or
• One SDC train shall be in operation with ≥ 2810 gpm flow through the reactor core.

Note 3: Primary coolant pumps P-50A and P-50B shall not be operated simultaneously.

Question 2

What technical specification governs the heatup and cooldown rates of the PCS?

Answer 2

T.S. 3.4.3 PCS Pressure and Temperature (P/T) Limits

PCS pressure, PCS temperature, and PCS heatup and cooldown rates
shall be maintained within the limits of Figure 3.4.3-1 and Figure 3.4.3-2.

At all times.

Heat Up

• Less than 170F - 20F/Hr
• 170F to 250 F - 40F/Hr
• >250 to <350F - 60F/Hr; if not on shutdown cooling. 40F/Hr if on SDC
• 350F or greater - 100F/Hr

Cooldown

• Head on: 3-hour soak at 110-135F, then 20F/Hr after
• Less than 170F - 40F/Hr
• 170F to 250 F - 40F/Hr
• >250 to <350F - 60F/Hr
• 350F or greater - 100F/Hr