Systems Exam 1 - 6.9kV and 480V AC Distribution Flashcards

Question

What do the sync scope lights indicate?

Answer 1

-lights off when ready to sync at 12:00 -lights get brighter as it gets farther from 12:00 (measures the voltage difference between positions, so farther out = higher voltage = brighter lights)

Answer 2

Two channels per bus for the Preferred offsite source bus undervoltage function inoperable →Restore one channel per bus to OPERABLE status within 1 hour OR →Declare the Preferred offsite source inoperable within 1 hour Two channels per bus for the Alternate offsite source bus undervoltage function inoperable →Restore one channel per bus to OPERABLE status within 1 hour OR →Declare the Alternate offsite source inoperable within 1 hour Two channels per bus for the 6.9 kV bus loss of voltage function inoperable →Restore one channel per bus to OPERABLE status within 1 hour OR →Declare the affected AC emergency buses inoperable within 1 hour Two channels per bus for one or more degraded voltage or low grid undervoltage function inoperable →Restore one channel per bus to OPERABLE status within 1 hour OR →Declare both offsite power source buses inoperable within 1 hour One or more Automatic Actuation Logic and Actuation Relays trains inoperable →Restore train(s) to OPERABLE status within 1 hour Required Action and associated Completion Time not met →Enter applicable Condition(s) and Required Action(s) for the associated DG made inoperable by LOP DG start instrumentation immediately

Answer 3

Train A and Train B AC, DC, and AC vital bus electrical power distribution subsystem shall be OPERABLE (Modes 1-4) One AC electrical power distribution system inoperable →restore AC electrical power distribution subsystem to OPERABLE status within 8 hours Two trains with inoperable distribution subsystems that result in a loss of safety function →enter TS LCO 3.0.3 immediately

Answer 4

The necessary portion of the Train A or Train B AC, DC, and AC vital bus electrical power distribution subsystems shall be OPERABLE to support one train of equipment required to be OPERABLE. (Modes 5-6). 1 hour or less, actions: One or more required AC, DC, or AC vital bus electrical power distribution subsystems inoperable →Declare associated supported required feature(s) inoperable OR →Suspend CORE ALTERATIONS immediately AND →Suspend movement of irradiated fuel assemblies immediately AND →Suspend operations involving positive reactivity additions that could result in loss of required SDM or boron concentration immediately AND →Initiate actions to restore required AC, DC, and AC vital bus electrical power distribution subsystems to OPERABLE status immediately AND →Declare associated required residual heat removal subsystem(s) inoperable and not in operation immediately

Answer 5

→Modes 1-4 →two offsite sources must be available →two DGs must be available →automatic load sequencers for Train A and Train B Two offsite sources can be satisfied by: →"Stephen Parker" - 138 kV Stephenville with 345 kV Parker #1 OR Parker #2 →"Number 2 Bends" - 138 kV Carmichael Bend with any 345 kV line except for Mitchell Bend (138 kV Stephenville line crosses all 345 kV lines other than Parker 1 and 2)

Answer 6

→Modes 5 & 6 →one offsite source must be available →one DG must be available

Answer 7

1 Hour or Less Actions →LCO 3.8.1.A One required offsite source inoperable: SR 3.8.1.1 (same as OPT-215) with completion time of one hour AND once per 8 hours thereafter →LCO 3.8.1.B One required DG inoperable: SR 3.8.1.1 (same as OPT-215) with completion time of one hour AND once per 8 hours thereafter →LCO 3.8.1.C Two required offsite circuits inoperable: restore one required offsite circuit to operable within 24 hours →LCO3.8.1.H Three or more required AC sources inoperable: enter TS LCO 3.0.3 immediately

Answer 8

1 Hour or Less Actions LCO 3.8.2.A - One required offsite source inoperable NOTE: Enter applicable Conditions and Required Actions of LCO 3.8.10, with the required train de-energized as a result of Condition A. →A.1: Declare affected required feature(s) with no offsite power available inoperable immediately OR →A.2.1: Suspend CORE ALTERATIONS immediately AND →A.2.2: Suspend movement of irradiated fuel assemblies immediately AND →A.2.3: Suspend operations involving positive reactivity additions that could result in loss of required SDM or boron concentration immediately AND →A.2.4: Initiate action to restore required offsite power circuit to OPERABLE status immediately

Answer 9

LCO 3.8.2.B One required DG inoperable →B.1: Suspend CORE ALTERATIONS immediately AND →B.2: Suspend movement of irradiated fuel assemblies immediately AND →B.3: Suspend operations involving positive reactivity additions that could result in loss of required SDM or boron concentration immediately AND →B.4: Initiate action to restore required DG to OPERABLE status immediately

Answer 10

thermal overload trips

Answer 11

generator anti-motoring operates on a predetermined value of power in reverse direction