What affect does placing the reactor in Mode 2 or 3 have on servo system reset gain?

Where are the safety channel heat power computers located?

What alarms and/or control actions are initiated, and in what modes of operation, if two or more wide range counting channels detect a reactor period of less than or equal to 5 seconds?

"True/False The not in run setback is a function of the reactor control system. Relays in the reactor control system are energized whenever the reactor is not in run. When these relays are energized, a contact in each channel is closed which in turn energizes the lower demand relay for that channel. In this manner demand is maintained at N(L) until the reactor control system is placed in run."

"True/False The ionization chamber power supplies are provided with 120 v ac from the Instrument Power system through P-1A."

What occurs when the "Heat Power" test pushbutton is pressed?

For what purpose is the "Run" pushbutton used?

What parameters are used as an input for calculating reactor power by the PLC in the WRCC system?

What two functions are performed by the FFED trip comparators and what is the FFED setpoint for each mode of operation?

Where is servo motor speed and direction indicated?

"True/False The servo regulating drive potentiometer sends a signal to the reg. rod position recorder, RG-422, on channel B, and provides reg. rod position indication over the one inch of travel on the right side of the control console."

To what measured variable does the flux reset module compare the flux signal to compensate for gradual changes in flux distribution over core lifetime?

"True/False The demand>flow setback automatically reduces an individual servo channel's demand setting whenever the demand signal exceeds the indicated heat removal ability of the primary coolant system."

How does the Flux Reset module function to compensate for the gradual changes in flux distribution over core lifetime?

"Fill in the Blank Each channel's fission chamber drive motor can be automatically operated or manually operated by push-pull rotary motion switch handles located __________ of the control console."

"True/False The safety system flux amplifiers are variable gain operational amps. By proper choice of a feedback resistor the amplifier output voltage for a given percentage of power for a mode is the same in all three modes of operation."

"Match the following servo regulating rod limit switches with their power supply. Note power supplies may be used more than once. Switch Power Supply A. Insert Limit 1. P-31, -32, and -33 B. ASI 2. P-29 (D-Bus) C. Intermediate Limit 3. P-1A D. Withdraw Limit 4. P-1B 5. Servo Channel Power Supplies"

"Fill in the Blank The safety system utilizes the 128 pressure system which has three _________ contact digital-electronic type pressure switches."

From where do the safety channel power supplies, located in drawer S-2, receive their power?

"True/False The Safety Channel Power Supplies, located in drawer S-2, regulate instrument battery voltage to various voltages used by the equipment in the safety channel drawers."

"True/False The servo system provides the primary automatic control of reactor power at levels >N(L) in Modes 1 and 2."

"Fill in the Blank The safety system vessel pressure switches monitor reactor vessel pressure for use in the __________ and the ___________."

Where is the flux reset gain set in a servo channel when the reactor is in mode 1 and the power level is below the range in which heat power instrumentation has good accuracy?

In what mode(s) of operation is the Low Pressure Trip enabled?

"Which of the following provides power to the reg. rod control console indication? A. P-31, -32, and -33 B. P-1A C. P-29 (D-bus) D. P-1B"

What is the purpose of the after heat computer in the safety channels?

"True/False The K1 relay provides the amber "latch" light on a fast trip comparator. The K1 relay can be made to function in two different ways. The K1 relay can either automatically reset when the condition clears or it can be made to "latch" in until manually reset. The "latch" on the fast scram fast trip comparators must be manually reset after a trip."

From where do the power supplies for the safety system flow transmitters receive their power?

"True/False For the not-in-run setback, the reactor control system opens the contacts supplying the demand signal to the analog multipliers in each channel, isolating the signal. A second set of contacts are closed which substitute a fixed voltage corresponding to 10% for the demand signal."

Where are the servo primary system flow transmitters located?

"Fill in the Blank A slow scram causes a shutdown of the reactor by interrupting magnet power through a __________."

"Fill in the Blanks The reactor control system is equipped with a key controlled rotary switch, located on the left side of the control console, which provides __________ over reactor operation. In the "Off" position, the key switch prevents all __________."

"Fill in the Blanks The OR gate in each safety channel monitors the output of the scram comparators and turns off the ____________ when one or more comparator's output goes to __________."

There are a total of eight inputs to each "OR" gate. Seven of the inputs are fed from the output of the fast scram trip comparators. What is the function of the eighth input?

"True/False A fast trip comparator circuit is bistable in nature; there is no change in output indication of -10 v until the predetermined "trip" level is exceeded, at which time the output suddenly goes to 0 v."

What effect does going from Mode 1 Start to Mode 1 Run have on the setpoint for the Heat Power Reverse?

What does the "pulled out" position provide on the fission chamber drive control switches?

What is indicated by the N(L) and N(F) lights on the control console for each servo channel?

"The safety system chamber voltage monitor and test unit in each channel constantly monitor for a drop in the ion chamber polarizing voltage. The unit will cause a slow scram and activate the "Ion chamber voltage-module continuity" annunciator at which of the following setpoints? A. 150 v B. 200 v C. 250 v D. 300 v"

What is the power supply for the PLC and the HMI in the Wide Range Counting system?

What effect does reaching the regulating rod drive insert limit have on the servo motors?

The wide range counting channels have two trips set at 10 cps and 50,000 cps which serve the count rate meter confidence. What do the two setpoints signify?

"The safety system has both a high range and a low range flow transmitter for each channel. A. The high range transmitter develops a signal proportional to what range of flow? B. The low range transmitter develops a signal proportional to what range of flow? C. For what purpose(s), other than indication, is the low range transmitter signal used in the safety system?"

"Fill in the Blanks The operation of the FFED ionization chambers is essentially the same as the safety system neutron flux chambers, with the exception that they do not have the _________ coating or gas to make them sensitive to __________."

"Fill in the Blank The servo system ion chambers are located in _________ which penetrate the reactor ________."

Where are the FFED ionization chambers located?

"True/False The servo demand drive unit consists of an adjustable bank of resistors for each channel."

"Fill in the Blank When the operating mode is changed the __________ on the safety flux amplifier is changed, causing the op amp to change its output voltage accordingly to match the input current."

"Fill in the Blank The safety system heat power computers develop a signal proportional to the reactor heat power in megawatts to supply a __________, the flux reset mechanism, a __________, and a heat power run permissive circuit."

From where is power supplied for the flow transmitters and equipment and the Chessell recorders in the servo system?

"Complete the following: The velocity adder is a differential gear box designed such that the output of the gear box is ________."

What is the maximum rate of movement for the regulating rod drive with all three servo motors operating at maximum speed in the same direction?

"True/False The safety temperature transmitters are supplied with AC power from the static invertors."

If the withdraw limit is reached the servo motors are inhibited in the withdraw direction and the withdraw limit brake is set on the servo motors. Withdraw limit also provides signals to the reactor control system. State two of the functions of the signals in the reactor control system?

"Fill in the Blanks Mode 1 Start is defined as an ____________ startup to 8.5 MW (NL - 10% of power range). In this mode the reactor is started under the control of the servo and wide range counting systems with ____________ primary flow and pressure established."

How do ionization chambers in the safety system detect neutrons?

List the 3 inputs for which reactor power is used in the WRCC system.

The rod withdraw inhibit in the servo system will prevent the withdraw of the servo drive and the shim drives if power rate of rise exceeds what setpoint?

"State the setpoint for the following: A. Ion chamber voltage slow scram B. Seismic slow scram C. Flux-to-Flow Fast Reverse D. Automatic depressurization"

"True/False The servo demand drive unit consists of a motor driven potentiometer for each channel."

"True/False The Flux-to-Flow air motor insert is disabled in modes 2 and 3."

"True/False The setpoint for the Flux Level Reverse is 1.1 N(F) for all modes of operation."

The servo flux amplifier receives a current proportional to the neutron flux from the ionization chamber and produces an output voltage proportional to what?

"True/False The servo channel power supplies, in the R3 drawer, regulate instrument battery voltage to various voltages used by the equipment in the servo channel drawers."

What occurs when the "Pressure" test button is pushed?

How many different voltages are produced by the voltage regulators in each servo channel?

From where does the reg. rod control console indication receive its power?

In what mode(s) of operation is the Low Pressure Trip disabled?

When will a demand>flow setback clear?

Where are the safety channel flow transmitters located?

"Which of the following is the correct purpose for the plate actuate switch (S-7)? A. Provides for administrative control over reactor operation B. Used to change modes of operation for the reactor control system C. Primarily for balancing control plate positions in Modes 1 & 2 Run and for blocking automatic shim rod withdrawal in Start. D. Used to change the power demand setting"

What parameters are used as an input for calculating reactor power by the PLC in the WRCC system?

"The "rate test" checks the safety system by: A. Adding a signal to the ion chamber prior to the flux amplifier at a rate of 30%/sec. B. Adding a signal to the ion chamber prior to the flux amplifier at a rate of 10%/sec. C. Connecting the output of the add-on ionization chamber in series with the input of the main safety chamber at a rate of 75%/sec. D. Connecting the input of the add-on ionization chamber in parallel with the output of the main safety chamber giving an increase of approximately 40%."

"True/False The HFIR utilizes special design multiple section ion chambers. Each chamber serves a single safety channel and a single regulating channel. The current design incorporates three separate chambers in a common housing."

To what length is the overall travel of the fission chamber drive units restricted by withdraw and insert limit switches?

"A. What is the setpoint for emergency depressurization? B. What actions occur when emergency depressurization is initiated? C. At what setpoint is emergency depressurization stopped?"

"True/False The setpoint for the Flux Level Reverse is 1.1 N(F) for all modes of operation except for Mode 1 Start."

Ion chambers detect neutrons by detecting the ions produced when neutrons interact with boron. How do fission chambers detect neutrons?

"Answer the following in regards to Mode 2 Operation. A. Maximum power? B. The primary flow rate required? C. Primary pressure required? D. Manually controlled or servo controlled?"

"True/False The safety system flux amplifiers receive a current proportional to the neutron flux from the ionization chamber and produce an output voltage proportional to the power level. The sensitivity of the channel is changed as required for operations in modes 2 and 3 by remotely changing the reference voltage on the trip comparators."

At what power levels and in what modes does the servo system provide the primary control of reactor power?

What type of temperature sensor is utilized in the Safety System?

"True/False The rate trip is functional in Mode 1 only."

"True/False The safety system ion chamber assemblies are held in the reactor vessel thimbles with remotely adjustable positioners."

"The servo power amplifiers accept the error signal produced by the ratio network and produces output voltages to cause the servo motor to insert or withdraw. The servo power amplifiers are powered with +/- 32 v from the instrument power fail free system through which of the following? A. P-31, -32, and -33 B. P-1A C. P-29 (D-Bus) D. Servo Motor Knife Switches"

"True/False The fission chambers are contained in flexible assemblies which are guided through thimbles in the reactor shielding leading to the core. The thimbles are located in the reactor pool and run vertically to the side wall of the reactor pressure vessel."

The reactor period signal is used to develop three digital outputs. Describe the 100 second period output including applicable mode(s) of operation, and the function served by the output. Also signify number of channels required (i.e. 1/3, 2/3, or 3/3) for the function.

The safety system utilizes the 128 pressure system which has three dual contact digital-electronic type pressure switches. Each pressure switch serves two functions in the system. The pressure switches provide the low pressure scram and what other function (include setpoint)?

"True/False Each servo channel has three independent voltage regulators which receive power from P-1A. The voltage regulators produce six different dc voltages which are used by various equipment in the servo channel drawers."

"Which of the following occurs when a "Pressure" test button is pushed? A. A bypass valve opens, causing the dP across the transmitter to equalize. B. A contact is opened isolating the pressure signal from the trip comparator. C. A valve closes on the inlet to the pressure switch isolating the switch from the pressure source. D. A valve downstream of a throttle valve in each line opens and discharges the pressure to the PLS system."

State two purposes for which the safety signal monitors primary system flow.

Each Safety Channel ionization chamber has a power supply in drawer S-3. From where do the power supplies receive their power?

"State the setpoint for the following safety system control actions in Mode 1 Run. A. Flux Level Reverse B. Flux-to-Flow Fast Reverse C. Level Trip D. Automatic Depressurization"

What is the purpose of an experiment setback in the servo system?

"Fill in the Blank The HFIR Safety System utilizes uncompensated ion chambers to detect and transmit a signal proportional to the __________."

"True/False In modes 2 and 3 the heat power trip is defeated by substituting a fixed reference voltage for the heat power signal."

"True/False The speed and direction of each servo motor is indicated on the velocity meter module located on the R2 drawers and above each demand indicator on the control console."

From where is the power for the fission chamber DC motor supplied?

"The reactor control system is equipped with a key controlled rotary switch, located on the left side of the control console, which provides administrative control over reactor operation. In the "Off" position, the key switch (S-1) does which of the following? A. Prevents all withdrawal of control plates B. Prevents all withdrawal of the shim motor C. Prevents all insertion of the control plate drives. D. Prevents reactor operation by deenergizing the OR" gate in each channel""

The OR gate in each channel accepts the -10 v output of the seven fast scram comparators. When a comparator trips its OR gate input goes to zero. When this happens what occurs to the output of the "OR" gate?