EFA

Question 1

What is the purpose of the Fire Detection (EFA) System?

Answer 1

Monitors areas (zones) of the plant for smoke and/or fire and provides alarms and control outputs as required

Question 2

What type of fire detectors are used in the Annulus?

Answer 2

Alison heat detection cables arranged in circles around the annulus.

Question 3

Where are the UV/IR Flame detectors used?

Answer 3

Areas with a large amount of oil
Spent Fuel pool

Question 4

Can the 25% Grace Time be used on hourly fire watches?

Answer 4

Yes, but shall NOT be cumulative

Question 5

If an hourly fire watch is performed early does the Fire watch start time change?

Answer 5

Yes

Question 6

What type of detector is used around the NCPs?

Answer 6

C. Fenwal Line-Type Heat Sensing Detector

Question 7

Where are Traditional Photoelectric Detectors used and why?

Answer 7

Used inside Containment, due to high dose rates.

Question 8

What are the two types of Traditional Thermal Detectors and where are they used?

Answer 8

• Fixed Temperature,Used in areas protected by Mulsifyre and CO2 Systems to provide automatic actuations
• Rate-of-Rise, Located in the Filter Bed Zones