Purposes and Stuff
What is the most limiting Design Basis Accident (based on radiological consequences) for which the consequences are mitigated by CRVICS?
Loss of Coolant (DBA LOCA)
What RPV water level will cause Standby Gas Treatment to start?
Level 2 -45.5”WR
Which CRVICS Isolation Groups are designated for Primary Containment Isolation Valves?
Groups 1 through 13
What would be the impact of operating two Auxiliary Steam Auxiliary Boilers at the same time?
This would make the 138 KV line (ERAT) inoperable.
What would be the Tech Spec impact of cross-tying Division 1 and 2 SX?
Both Div 1 and 2 SX would be INOP.
(LCO 3.7.1 - Mode 3 in 12 hrs, Mode 4 in 36 hours)
What is the design magnitude of seismic acceleration to which CRVICS is designed to withstand without impairment to its ability to initiate automatic isolation?
Safe Shutdown Earthquake of 0.25g
What is the CRVICS isolation setpoint for Containment Building Exhaust Radiation Monitors 1RIX-PR001A-D?
100 mr/hr
Which CRVICS Isolation Groups are designated for Secondary Containment Isolation Valves?
Group 19
What components act as switches to control the application of 120VAC to the Inboard and Outboard MSIV solenoids?
High Power Optical Isolators (HPOI)
What are the physical design classification requirements of containment isolation valves and associated piping and penetrations?
They must meet Seismic Category 1 requirements as well as ASME Class 1 or 2.
What are the three design basis accidents that CRVICS is designed to mitigate?
loss of coolant accident
main steam line break
fuel handling accidents
Which CRVICS isolation signal will isolate IA to CNMT?
RPV Level 1 -145.5”WR
Which CRVICS Isolation Groups are designated for Drywell Isolation Valves?
Group 13 thru 18
Daily Double !!!!!
Category
Which Live Gaming event in 2019 had a total viewership of 137 million?
What are the notification requirements if the Main Generator Power System Stabilizer function is out of service?
(FERC Requirement)
The Transmission System Operator (TSO) [Ameren Dispatch] must be notified As Soon as Possible, but within 30 minutes of PSS function out of service.
The PSS adjusts field current to compensate for sub-harmonic sympathetic frequencies that cause hunting. Minimizes local and grid effects from far away grid contributors and allows CPS to put more power on the grid.
What two Reactor Vessel internal components assure that the reactor core can be re-flooded to a minimum of two thirds core height following a postulated LOCA?
Core Shroud
RR Jet Pumps
Under what conditions will an RPS trip be generated by the Oscillation Power Range Monitors?
OPRM Enabled (>25% power, <60% core flow)
Oscillation Detection Algorithm (ODA) trip
- period, growth rate, or amplitude based algorithm
At least one module in a minimum of two divisions will satisfy 2 out of 4 logic for an RPS scram.
List all the Group 1 Isolation Valves.
1B21-F022 A-D (Inbd MSIVs)
1B21-F028 A-D (Outbd MSIVs)
1B21-F016 and -F019 (Main Drain & Bypass valves)
1B21-F067 A-D (Outbd MSIV before seat drains)
What is the power supply to the optical isolators in CRVICS Group 1 logic and what is the impact of a loss of power to one of these optical isolators?
+12VDC power from NSPS power supplies.
+12VDC power from NSPS power supplies.
Loss of power will result in trip condition for the signal being passed through the optical isolator
(logic level Zero signal)
Both Div 1 and Div 2 Cnmt HVAC Isol Vlv Rad Interlock switches are taken to Fuel Bldg Bypass.
What Tech Spec actions are required?
Restore Secondary Containment isolation capability within 1 hour.
Per LCO 3.3.6.2, with one or more automatic functions with secondary containment isolation capability not maintained, Action B.1 requires restoring isolation capability within 1 hour. The function with automatic isolation capability not maintained is Function 6 from table 3.3.6.2-1, Fuel Building Exhaust Radiation High.
Having both HVAC Rad Interlock switches in FB Bypass defeats the isolation from all 4 FB Exhaust Rad Monitors 1RIX-PR006A-D.
The plant was operating at near full power when the TDRFPs slowly ramped down to the low speed stop.
Drywell pressure is 1.12 psig slowly rising.
NO OPERATOR ACTIONS have been taken.
The ADS 105 second timer initiated alarms just came in.
Based on current plant conditions,
Name 4 systems that can be used to control injection into the RPV.
HPCS
RCIC
RD
SLC
Based on the above conditions, RPV level is below Level 1. This will result in a Group 1 Isolation. ADS has not yet initiated.
No actions have been taken to lower RPV pressure and there are no indications of a leak in the Drywell. RPV pressure should be controlled by SRVs cycling on LLS.
This would preclude the use of any low pressure injection sources. TDRFPs are unavailable due to Group 1 Isolation. No action was taken to start the MDRFP, so the TDRFPs will be coasting down due to no steam and the MDRFP will not start due to shunt trip of TB MCC 1M.
Note: SLC is included in the list of available sources. Per EOP-1, conditions would warrant use of both preferred and alternate injection sources.
What is the CRVICS isolation setpoint that will isolate the CNMT Bldg Sply/Exh Inbd/Outbd Isol Byp Vlvs?
High CNMT Pressure 2.56 psid
Which Group 1 isolations (if any) are NOT bypassed by placing the associated division NSPS Sensor Bypass Switch in BYPASS?
Manual CRVICS initiation pushbuttons
Following a normal shutdown of RAT B SVC, how long will it take for the Blue “Ready” light to illuminate in the MCR after opening the SVC breakers and why?
5 minutes
Time delay required to allow the capacitors to discharge
The containment isolation system is designed to function if operating conditions or radiological release is in danger of exceeding the limits contained in what document?
10 CFR 100
or, for the accidents analyzed using Alternative Source Terms, the limits of 10 CFR 50.67