MS/AS

Question 1

Discuss ASDV setpoint and basis

Answer 1

Opening setpoint of 1125# (561F RCS temp)

Full open 1170#, 15 # before safeties

Question 2

State capacity of ASDV

Answer 2

2.5% design steam flow each

Question 3

State Main Steam Isolation Signals (MSI)

Answer 3

HI-2 Containment pressure 4.3# 2/3
Steam line pressure low 585# 2/3 w/o P-11
SG Pressure Negative rate high 100# W/50 second time constant 2/3

Question 4

Discuss A MSI signal

Answer 4

Auto: MSIVs, Bypass valves and upstream Drains close
Manual: MSIVs and Bypass valves close

Question 5

Discuss B MSI signal

Answer 5

only MSIVs shut

Question 6

State which ASDVs have backup air

Answer 6

A and B ASDV

Question 7

When can ASDV control air be used

Answer 7

Control air is only in use when the ASDV is being controlled from its M/A controller

Question 8

When is N2 used in an ASDV

Answer 8

N2 is used by C/D ASDVs when opening

Question 9

When in Back up air used in ASDVs

Answer 9

Back up air is used by A/B ASDVs when opening

Question 10

Discuss ASDVs disabling switches

Answer 10

RSS disabling switches deenergizes train related solenoids (1-4)
Operation is still available through Jog switch in the CR

Question 11

List opening pressures for the MS Safeties

Answer 11

1185#
1195#
1205#
1215#
1225#

Question 12

State auto closure setting for MS-V-185 (inlet to Aux Steam reducer)

Answer 12

High aux steam pressure 175#

Low Main Steam Pressure 150#