Instrumentation and Control

What is the limit for instrumentation calibration?

100 kW, since you can't calibrate with anything higher due to not having a source for it

What is Bistable

on or off

What is Comparator

non-binary adjusted to a set point

Flow and Level Switches

use float to note change, binary system

Level Transmitter

float to sense change with multiple switches, non-binary

How often do you calibrate the NI Channels?

Annually and after maintenance

What are the three modes for fission chamber?

Pulse counting in parallel with B-10

Pulse counting when B-10 deenergized

Compbelling is log with signal proportional to noise

What does Power Channel 1 contain?

B-10 and Fission Chamber, logarithmic

When does Power Channel 1 produce a full trip?

2 blades off the ground and

period at 3 seconds, sensed by bistable, PERIOD scram announcer OR

10% drop in the HVPS, sensed by bistable, with HIGH VOLTAGE scram annunciator OR

scram annunciator lamps are ON when a trip is initiated

Note about full trip and log-N

1 kW signal is used as lower threshold for a blade drop trip for secondary well and city, using the SEC PRESS scram annunciator (used to check instrumentation works, since 1 kW is the point where secondary cooling is needed.

What produces blade withdrawal interlock?

-Safety Channel 1 calibrate switch not in OPERATE, with INT'LK annunciator

-Safety Channel 1 Trip test switch not in OFF, has no annunciator

-Period Calibrate Switch not in OPERATE, with INT'LK annunciator

-Period at 10 seconds, sensed by bistable, with FAST PERIOD annunciator

-Log-N signal at 2 cps, sensed by bistable, with SOURCE annunciator

Where is Log-N signal recorded?

2-pen recorder (green pen {currently broken})

---extended range (B-10 & FC) 10 µW to 50 mW

---FC 10 µW to 150 kW

and Period meter: -30 seconds to ∞ to +3 seconds

What is the Tech Specs requirement for power channels?

2 must be operable at all time, therefore all 4 detectors

What are the functions of the wide range drawer?

-Provides detector bias (HV) and operating voltages to B-10, FC, and CIC

-processes preamp signal

-turns off high volts to B-10 at 400 cps (must be off by 600 cps)

-transmits Log-N and Period signals to trip units (RPS), indicators, and meters

-differentiates log level signal for power indication

-differentiates power level signal for period indication

-supplies compensation for gamma

Safety Channel 1 details

Linear

FC operation in ion chamber mode, signal from 1 electrode in chamber with 2

produces a full trip if 2 blades off bottom at 110% power, by bistable, with SAFETY 1 scram annunciator (basically like a check engine light)

-gamma compensation not needed since its proportional to neutron flux in power range

Safety Channel 1 circuit diagram

KNOW IT

What does Reactor Power Channel 2 have?

CIC, UIC

Linear neutron channel and Auto Flux Control

10 micro to 100 kilo watts (like fission chamber)

Where is the CIC signal transmitted to?

Pico-ammeter (multirange red pen)

automatic blade control system

What are requirements to run the autoflux?

must be above 1 watt

period must be ∞

power within 20% of desired setting

control blade less than 750 units (should be less than 650)

What does CIC have that UIC doesn't?

active gamma compensation via negative gamma signal summing (take signal from gamma, make negative, add to signal from neutron+gamma)

Safety Channel 2 details

-UIC

-full trip, if 2 off bottom, by bistable, if at 110% power or 10% drop in HVPS for SC-2

-scram annunciator for both trips is SAFETY 2

-interlock on blades if SC-2 switch not in OPERATE

-linear from 0 to 150

Startup source details

SbBe licensed for 25 Ci, have 10 Ci

PuBe license for 39 g Pu, have 1 Ci

Why is the PuBe removable?

To protect the casing

What is the process for insertion of the PuBe?

Sign on Console indicating location (CVP or EVP)

Alarm on Log-N meter at 100 watts, sensed by bistable

Daily operating log entry

What are the 2 methods of voiding core?

Dump Valve (actuates on loss of AC power or scram)

Rupture disk

Primary Coolant temperature sensing details

Type T Copper-Constantan thermocouples

in Fahrenheit

need 4/6 operable

Inlet and outlet trips sensed by bistable and HI PC TEMP scram annunciator

LOOK AT FLOW CHART

Primary core inlet flow sensing details

strain gauge in a RAMAPO Mark V flow meter

in gpm

nominal 46-48 gpm

trip at 41 gpm, COOLANT FLOW scram annunciator

max flow" 60-65 gpm

Primary core outlet flow details

Model FS-200 flow switch, no return flow to tank results in COOLANT FLOW scram annunciator

Primary Resistivity details

Located at inlet and outlet of purification system

Equipment pit monitor details

-level switch alarms at more than 2 cups of water

-solid green with no problems

-flashing red with audible is alarm, can silence alarm

What is the indicator for the primary core water level

sight glass level with the core

Primary core water level scram

42.5 inch (2 inch above fuel) with COOLANT LEVEL scram annunciator

Shield tank level scram

18 inch below top of the tank, TANK LEVEL scram annunciator

What is the demin pump interlock

-Demin turns off when PC is on

what is the interlock with the PC and dump valve

PC turns off if dump opened when PC is running, PRI COOLANT lamp turns on

what is the water level in the primary coolant tank?

20-27 inches, check sight glass

What are the values of flow for the well water?

-The well flow is WARN WELL at 140 gpm, trip at 60 gpm with FLOW SCRAM annunciator, recall 10 second delay

-city trips at 10 gpm, with no delay

note about valve flag

there is a flag visible from the control room to tell if valve is open, where water is coming from

What are the three filters in the vent system?

Rough and Absolute Filters, and core vent flow

interlock on vent system

if stack not running core cannot run

What causes the HVAC to stop?

Fire and evacuation