Mode 3 to Mode 5

Question 1

Which Pressurizer level channels are calibrated HOT, and which COLD?

Answer 1

HOT - RCA-LT-110X and RCB-LT-110Y

COLD - RCN-LT-103

NOTE: Correct actuals by using 9ZZ10 appendices

Question 2

When must LTOP’s be Operable?

Answer 2

When ANY RCS Cold Leg temp is < 221 F. Or the RCS is depressurized with vent path >16 square inches is available (can remove PZR manway or all 4 safety valves)

Question 3

What is the most limiting RCS Pressure Boundary?

Answer 3

Reactor Vessel (PT curves-brittle fracture

Question 4

To minimize RCP bearing damage, what RCP combinations are avoided?

Answer 4

1A and 2B. Or 1B and 2A.

Preferred pumps are 1A and 1B due to PZR spray.

Question 5

When can SDC be placed into service? When is it Procedurally recommended to be put in-service? And Why?

Answer 5

Can be put in at 350F (SM/CRS direction). Recommended at 300F to protect LPSI seals.

Question 6

When would we NOT put SDC in-service when going down to Mode 4?

Answer 6

When we go to M4 but don’t intend on going to M5. RCS Heat Removal should be via SG’s.

Question 7

Why are HPSI breakers disabled in M5?

Answer 7

Prevent possible Low Temp Overpressure (inadvertent start of a HPSI)

Question 8

How long can the 525kV main generator breakers be opened and energized for?

Answer 8

Not to exceed 2 hours. If done, will reduce breaker life or cause premature break down of the surge capacitors.

“Re-Ring” bus < 2 hours post-trip (increases electrical switchyard reliability)

Question 9

What is checked after SDC is initiated?

Answer 9

RCS Boron concentration, ensures adequate SDM at 210F.

Question 10

When is BDAS and Start-Up channels required to be placed into service?

Answer 10

Within 1 hour of entering source range (2 x 10^-6% power)

Question 11

If the “FLUX/SETPOINT” pushbutton is pressed more than 2 times in 3 seconds, what does this place the channel in?

Answer 11

TEST. Impacts channel operability until Test is complete.