MSRs

Question 1

Where does the U1 MSDTs drain to? **

Answer 1

• 5 FW Heaters

Question 2

Where does the U2 MSDTs drain to? **

Answer 2

• 4 FW Heaters

Question 3

What is the purpose of the MSRs?

Answer 3

• Mechanically removes moisture from the HP Turbine exhaust
• Reheats dried steam almost to initial live steam temperature by passing it thru a bundle of heating tubes
• Minimizes erosion of LPT components as well as the momentum losses due to excessive moisture *
• Designed to remove > 98% moisture in cold reheat steam

Question 4

What is the flowpath of steam through the MSRs?

Answer 4

• HPT exhaust steam enters the bottom of the MSRs
• Steam goes thru moisture separators
• Steam exits moisture separators and enters reheater tube bundles
• Exists MSR via 3 leads as superheated steam

Question 5

Where do the RHCDTs drain to during startup for both units?

Answer 5

• Main Condenser Drip Receivers

Question 6

Where do the U2 RHCDTs drain to during loaded operations for both units? **

Answer 6

• 6 FW Heaters

Question 7

Where do the U1 RHCDTs drain to during loaded operations? **

Answer 7

• 6 FW Heaters

Question 8

Where do the MSR 2nd pass drains for both units go to?

Answer 8

• RCDTs then to 6 FW heaters

Question 9

Where do the MSR 4th pass drains for both units go to?

Answer 9

• 6 FW heaters

Question 10

How do the Reheater MRV Steam Supply valves fail on a loss of air for both units?

Answer 10

• Closed

Question 11

How do the Reheater MRV and MMO Steam Supply valves respond on a turbine trip for both units?

Answer 11

• All steam supplies to MSRs Auto Close on a Turbine Trip

Question 12

How do DRV-450/460, Downstream Steam Supply Drains respond on a turbine trip?

Answer 12

• Auto Open

Question 13

U1 HMOs (U1 MSDT Drains to the 5 Heaters and RCDT Drains to 6 heaters) close on what in the associated FW Heater

Answer 13

• high high level

Question 14

U2 HMOs (U2 MSDTDrains to the 4 heaters) close on what in the associated FW Heater

Answer 14

• High High Level

Question 15

Do the HMOs (RCDT Drain valves to the 6 heaters) close on a high high level on associated heater?

Answer 15

• Yes, they do

Question 16

When will HMO-609 (U1 crosstie valve between drain headers to 6A/B FW Heater) open?

Answer 16

• Auto opens if either U1 drain valve HMO-603/604 not full open
  (Auto closes when both drain valves are full open)

Question 17

When will HMO-629 (U2 Reheater Coil drain x-tie) auto open?

Answer 17

• Automatically open if either HMO-630 or HMO-631 (U2 RCDT Drains to 6 heaters) are less than full open

Question 18

What is the alt drain path for the MSDTs?

Answer 18

• Main Condenser Drip Receivers