E-21, SSPS, RPS
What is the purpose of these systems?
To initiate the required protective action whenever a condition monitored by the system reaches a preset level to protect the three barriers to the release of radioactive materials
Is AMSAC safety related?
What is the purpose of SPDS?
Monitor and display plant parameters used for post-accident monitoring.
What is the purpose of the tube control oil system?
Provide EH fluid used by DEHC system to control speed and loading of the main turbine by controlling opening of governor valves
provide equipment protection by closing all steam valves to interrupt steam flow to the main turbine if the reactor trips, the generator trips, of if there is a condition that could damage the turbine or the plant
What is the purpose of the NIS?
To measure the number of neutrons leaking from the core
How many channels of E-21 are there? Trains of SSPS?
4 channels of E-21
2 trains of SSPS
What does AMSAC stand for?
Anticipated Transient Without Scram Mitigation System Actuation Circuitry
Is it safety-related?
Which valves does the TCO system contain valve actuators for?
Governor valves
Stop Valves
Interceptor valves
Reheat Stop valves
What are the four ranges?
Source, Intermediate, Power, Post Accident (Gamma-metrics)
What is the position of the Rx trip bypass breakers (open/closed, racked in/out) during testing?
Racked in and closed to allow for trip testing
What is the purpose of AMSAC?
To inject turbine trip and equipment actuation signals independent of the SSPS
2 per unit in control room
2 in TSC
2 in EOF
Where is the EH reservoir located?
119' Elevation
What is the location of the four ranges?
Source: Bottom of core at 0 and 180
Intermediate: Middle of core at 0 and 180
Power: 45, 135, 225, 315
Gamma metrics: 90 and 70
Name two inputs and two outputs of the SSPS system?
Inputs: Eagle 21, Nuclear Instrumentation, Seismic Instrumentation, Field Contacts, Manual Inputs
Outputs: RPS, ESFAS, Indications
When does AMSAC become armed?
>40% Reactor Thermal Power
>32% Turbine Power
Where is the SPDS application hosted?
SPDS application is hosted on the transient recording system (TRS) in PPC room
SPDS in TSC and EOF are connected to DCPP LAN and receive data from DMZ servers
What is the purpose of the EH reservoir?
Oil to the suction of the EH pumps
Acts as a surge volume of EH fluid for the EH system
How many channels and detectors are there for each range?
Source: 2 channels, 1 per channel
Intermediate: 2 channels, 1 per channel
Power: 4 channels, 2 per channel
Post Accident:2 channels, two per channel
What does the reactor trip system do? What does ESFAS do?
Reactor trip system automatically shuts down the reactor whenever the limits of safe operation are approached by dropping control rods in the core
ESFAS performs protective actions to mitigate the consequences of postulated accidents: Safety Injection, Phase A and B containment isolation, steamline and feedline isolation, aux feedwater actuation
3 of 4 steam generators have been at or below the 11% NR level set point for greater than 25 seconds
Name 2 SPDS screen requirements.
Concise display, rapid response, reliability, data validity, convenient location, continuous display, isolation from safety systems, procedures and training, selection of information for display, human factors, minimum plant parameters for display
The TCO system must be able to prevent what two events from occcuring?
Excessive cooldown
Overspeed condition
What is another name for a source range instrumentation? Intermediate? Power?
Source: BF3 proportional counter
Intermediate: Compensated ion exchanger
Power: Uncompensated ion exchanger