ARM

Question 1

What is the purpose of the ARMs?

Answer 1

Warn of abnormal radiation levels in areas where radioactive material may be present, stored, handled or inadvertently introduced and to provide information regarding radiation levels at selected locations within the plant that are normally frequented by plant personnel

Question 2

What is the purpose of a radiation source or “bug”?

Answer 2

provides a small non-zero reading to allow differntiating between a low rad level and a failed detector
a downscale alarm with a bug source would indicate an instrument failure

Question 3

Where are teh ARM indicators?

Answer 3

Located on the back panel in the control room and indicate the local radiation level

Question 4

What alarms or indications of abnormal conditions are available in the MCR for ARMs?

Answer 4

902-3 Panel - Downscale or high trip - Common alarm

902-11 - AMBER Seal in light on trip unit

Question 5

How are the 902-3 ARM alarms reset?

Answer 5

They can be reset by taking the normal/bypass switch on the 902-2 panel to “bypass”
when the condition clears the indicator trip unit must be reset on the unit itself

Question 6

How does a ARM trip unit function?

Answer 6

trip unit de-energizes relays on trip signal.

Question 7

How does a loss of power impact the ARM Trip Unit?

Answer 7

Trip Unit de-energizes relays on a trip signal. Loss of power will give same indication as a High Rad condition and downscale condition.

Question 8

Some ARMs have two inputs to the recorder, in order to provide a full range of indication. Example: Refuel Floor and Charcoal Adsorbers

Answer 8

Some ARMs have 2 inputs to the recorder, in order to provide a full range of indication. Example: Refuel Floor and Charcoal Adsorbers

Question 9

Where is the ARM Bypass Switch

Answer 9

902-2 panel

Question 10

How are ARM’s tested?

Answer 10

There is a trip check button on the back panel indicator

Question 11

What is an ARM Aux Unit?

Answer 11

They are stationed at SOME of the ARM locations to provide a LOCAL alarm and indication of HIGH Level trip

Question 12

What ARM locations have Aux Units?

Answer 12

RFP rooms
517 RB (TIPS)
517 RB South Access
613 RB
RWCU Area
Stock COntrol Room
RW Control Room
RW Barreling Area
OGFB Charcoal Adsorber Vault

Question 13

What is the power for ARM System?

Answer 13

INSTRUMENT BUS - NOT 24/48vdc