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Advanced Systems > Rad Monitoring and Control > Flashcards

Rad Monitoring and Control Flashcards

1
Q

What is the purpose of the Area Radiation Monitoring System?

A

Consists of detectors, instrumentation, and alarms to warn plant personnel of rising radiation levels in various areas of the plant, and provides early warning of plant malfunction

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2
Q

What initiates a CHR signal?

A

2 out of 4 containment rad monitors

                             or

1 out of 2 containment refueling monitors

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3
Q

What brings in the CHR alarm in the Control Room?

A

Alarm is only fed by 1 out of 4 from containment rad monitors
1 out of 2 from containment refueling monitors initiates a CHR signal, but not the control room alarm

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4
Q

Which channel(s) are initiated by a CHR signal?

A

Both left and right channels are initiated regardless of which monitors cause it.

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5
Q

Where are area rad monitors powered from?

A

Preferred AC buses, or the instrument bus

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6
Q

What is the purpose of the interface between the Rad Monitoring System and plant ventilation systems?

A

Area rad monitors trip ventilation and dampers associated with that area on a high rad alarm

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7
Q

What is the purpose of the interface between the Rad Monitoring System and CRHVAC?

A

CHR initiates CRHVAC Emergency Mode

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8
Q

What is the setpoint for CHR signal?

A

10 R/hr on the containment rad monitors

80 mR/hr on the containment refuel monitors

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9
Q

What are the automatic actions associated with the Penetration Room Ventilation System?

A

High alarm at 4 mR/hr trips supply and exhaust fans/dampers to prevent the spread of radioactive noble gases and airborne particulate

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10
Q

What are the automatic actions associated with the blowdown rad monitor?

A

High alarm at 9.8E3 cpm isolates blowdown tank discharge to the mixing basin, and top/bottom blowdowns from both generators

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11
Q

What are the automatic actions associated with the CCW rad monitor?

A

High alarm at 7000 cpm re-positions CCW Surge Tank Vent from the room to the VGCH

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12
Q

What are the automatic actions associated with the radwaste discharge rad monitor?

A

High alarm at 1.5 times the calculated count rate closes both the 1” and 3” liquid radwaste discharge valves to terminate the release

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13
Q

What are the automatic actions associated with the radwaste area ventilation monitor?

A

High alarm at 900 cpm trips V-10 and V-14, and their associated dampers

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14
Q

What are the automatic actions associated with the ESS Rooms rad monitor?

A

High alarm at 900 cpm isolates supply and exhaust dampers

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15
Q

What are the automatic actions associated with the waste gas discharge rad monitor?

A

High alarm set based on decay tank contents, terminates release if high alarm setpoint is exceeded

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16
Q

What are the automatic actions associated with the radwaste addition ventilation monitor?

A

High alarm at 1.04E4 cpm trips V-67 and standby V-68, along with their associated dampers

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17
Q

What are the automatic actions associated with the fuel building addition ventilation monitor?

A

High alarm at 1.04E4 cpm trips V-69 and standby V-70, along with their associated dampers

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18
Q

What are the automatic actions associated with RGEM?

A

On an alert at 1.6E4 cpm, sample flow is routed through the sample bomb for 15 seconds to flush sample bomb and give a representative sample.
On a high alarm at 1.3E6, normal sample flow is bypassed and sample flow is diverted to accident filters and high range noble gas monitor

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19
Q

What is the purpose of the Process Rad Monitoring System?

A

Ensures that rad levels of process streams are indicated and alarmed so that action, either auto or manual, can be taken to prevent radioactive releases.

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20
Q

What are the consequences of improperly isolating the Waste Gas Monitor?

A

It can isolate the RV-1111 discharge path, thus disabling the WGST overpressure protection

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21
Q

What are the consequences of operating the rad monitoring system with insufficient sample flow?

A

Defeats the function of the monitor because it isn’t able to measure the radioactivity of a representative sample of the effluent

22
Q

What information needs to be completed on a WGDT batch card?

A
  • Tank pressure
  • Release volume
  • Gamma concentration of tank contents
  • Expected reading on RIA-1113 during release
  • Calculated release limit on RIA-1113
  • Tank isolation date/time
23
Q

How is the RIA-1113, Waste Gas Monitor, release setpoint obtained?

A

Determine the background count rate after purging the monitor, and add it to the calculated release limit on the batch card

24
Q

What actions are required if a Main Exhaust Fan trips during a WGDT release?

A

Immediately terminate the release because you no longer have adequate dilution flow for the release

25
Q

What are the admin requirements for releasing a WGDT with RIA-1113 inoperable?

A

2, 2, and 2 rule.
2 samples are obtained and analyzed independently
2 independent verifications of the release rate
2 NPOs independently verify the release lineup

26
Q

LCO 3.3.3, “Engineered Safety Features (ESF) Instrumentation” requirements

A

4 ESF bistables and associated instrumentation shall be operable
This is referring to the 4 containment rad monitors (RIA-1805, 1806, 1807, and 1808)

27
Q

LCO 3.3.3, “Engineered Safety Features (ESF) Instrumentation” applicability

A

Modes 1-4

28
Q

LCO 3.3.4, “Engineered Safety Features (ESF) Logic and Manual Initiation” requirements

A

2 ESF manual initiation and 2 ESF actuation logic channels shall be operable
Both manual CHR push buttons and both trains of automatic CHR

29
Q

LCO 3.3.4, “Engineered Safety Features (ESF) Logic and Manual Initiation” applicability

A

Modes 1-4

30
Q

LCO 3.3.6, “Refueling Containment High Radiation (CHR) Instrumentation” requirements

A

2 refueling CHR auto actuation function channels and 2 manual initiation channels shall be operable
Both refueling monitors and both CHR push buttons

31
Q

LCO 3.3.6, “Refueling Containment High Radiation (CHR) Instrumentation” applicability

A

During core alterations and during movement of irradiated fuel in containment

32
Q

LCO 3.3.6, “Refueling Containment High Radiation (CHR) Instrumentation” required actions in less than 1 hour

A

If 1 or more functions with 2 channels inoperable, then IMMEDIATELY suspend core alterations and suspend movement of irradiated fuel in containment

33
Q

LCO 3.3.7, “Post Accident Monitoring (PAM) Instrumentation” requirements

A

The PAM instrumentation for each function in table 3.3.7-1 shall be operable
Both high range containment area rad monitors shall be operable

34
Q

LCO 3.3.7, “Post Accident Monitoring (PAM) Instrumentation” applicability

A

Modes 1-3

35
Q

LCO 3.3.7, “Post Accident Monitoring (PAM) Instrumentation” required actions in less than 1 hour

A

If completion times for other actions are not met, then IMMEDIATELY enter LCO 5.6.6, which requires a 14 day letter to the NRC

36
Q

LCO 3.3.10 “Engineered Safeguards Room Ventilation (ESRV) Instrumentation” requirements

A

2 channels of ESRV Instrumentation shall be operable

37
Q

LCO 3.3.10 “Engineered Safeguards Room Ventilation (ESRV) Instrumentation” applicability

A

Modes 1-4

38
Q

LCO 3.3.10 “Engineered Safeguards Room Ventilation (ESRV) Instrumentation” required actions in 1 hour or less

A

If 1 or more channels are inoperable, then IMMEDIATELY initiate action to isolate the associated ESRV System

39
Q

LCO 3.4.15 “PCS Leakage Detection Instrumentation” requirements

A

3 of the following PCS leakage detection instrumentation channels shall be operable:

a. 1 containment sump level indicating channel
b. 1 containment atmosphere gaseous activity monitoring channel
c. 1 containment air cooler condensate level switch channel
d. 1 containment atmosphere humidity monitoring channel

40
Q

LCO 3.4.15 “PCS Leakage Detection Instrumentation” applicability

A

Modes 1-4

41
Q

LCO 3.4.15 “PCS Leakage Detection Instrumentation” required actions in less than 1 hour

A

If all required channels are inoperable, then IMMEDIATELY enter LCO 3.0.3

42
Q

ORM 3.17.6, “Other Instrumentation” requirements

A

Both SFP area rad monitors shall be operable

43
Q

ORM 3.17.6, “Other Instrumentation” applicability

A

When fuel is in the SFP area

44
Q

ORM 3.17.6, “Other Instrumentation” required actions in less than 1 hour

A

If 1 or 2 of the SFP area rad monitors are inoperable, then IMMEDIATELY stop moving fuel within the SFP area

45
Q

What rad monitors would indicate primary to secondary leakage?

A
  • Blowdown Monitor
  • Blowdown Vent Monitor
  • Condenser Off-Gas Monitor
  • Main Steam Line Monitors
46
Q

Containment gamma monitor self test

A

Every 17.1 minutes, each monitor undergoes and automatically initiated self test using an internal electronic check source.
Test lasts 3-6 seconds, during which time the detector is not measuring the ambient radiation field

47
Q

What is indicated on a digital rate meter area monitor when an out of range high condition exists?

A

“EEEEE” is displayed, and “RANGE” alarm LED illuminated

48
Q

What is indicated on a digital rate meter process monitor when an out of range low condition exists?

A

“0.00E0” is displayed, and “RANGE” alarm LED illuminated

49
Q

What happens when you push the “CHECK SOURCE” button on a digital rate meter process monitor?

A

Unshields a local check source at the detector

50
Q

How is a waste gas release manually terminated?

A

By lowering the high alarm setpoint on RIA-1113 until the high alarm actuates, which then automatically closes the waste gas release valves

51
Q

EK-1371 “RADIATION MONITOR SYSTEM CKT FAILURE”

A

Caused by loss of potential or meter downscaled on any process monitor except the failed fuel monitor
Check individual RIA “FAIL” alarms
For analog channels, the green “Fail/Reset” lamp will be dark
For digital channels, the red “FAIL” LED will be illuminated

Advanced Systems (36 decks)

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