BOP-ESFAS

Question 1

What is the power supply for the Train A BOP-ESFAS Cabinet?

Answer 1

PNA and PKA auctioneered
Both converted to 24VDC
2 fans - 1 AC and 1 DC

Question 2

What two Radiation monitors are responsible for the FBEVAS Actuations?

Answer 2

RU-31 (A) Spent Fuel Pool Area Radiation Monitor

RU-145 (B) Fuel Building Ventilation Exhaust Low Range Radiation Monitor

Question 3

Does train “A” FBEVAS cross trip the “B” train FBEVAS? Cross trip CREFAS?

Answer 3

Yes - Yes

While tripped the module will send the following signals:
o Trip to the same train CREFAS module
o Trip to the other train FBEVAS module
o To the actuation logic

Question 4

What lights would be lit on the BOP-ESFAS cabinent if Ru-31 went into HIGH alarm?

Answer 4

FBEVAS Trip and Actuate lights on “A”
just Actuate light on “B”

CREFAS would be cross tripped

Question 5

If a SIAS and FBEVAS occur simultaneously, where is the suction path for the Fuel Building Essentials?

Answer 5

Aux Building below 100’

If a SIAS and a FBEVAS occur concurrently, the** SIAS will override** the FBEVAS, causing the Fuel Bldg Ess AFUs to lineup and take suction on the Aux Bldg. The operator does have the ability to override this feature and align the AFU to the Fuel Building. The Aux bldg. suction path is 100’ and below.

Question 6

Does a CRVIAS cross trip CREFAS?

Answer 6

No

Question 7

What is the design basis for CREFAS?

Answer 7

Maintain whole body exposure < 5 REM.

Question 8

What radiation monitors cause a CPIAS?

Answer 8

RU-37 (A) Power Access Purge Area Monitors
RU-38 (B) Power Access Purge Area Monitors

Question 9

What happens if two modules are placed in bypass at the same time?

Answer 9

Both modules come out of bypass

Question 10

What radiation monitors actuate CREFAS?

Answer 10

RU-29 (A) Control Room Ventilation Intake Monitors
RU-30 (B) Control Room Ventilation Intake Monitors

Question 11

What radiation monitors actuate CREFAS?

Answer 11

RU-29 (A) Control Room Ventilation Intake Monitors
RU-30 (B) Control Room Ventilation Intake Monitors

Question 12

What causes the Man light to be lit on the BOP ESFAS cabinent?

Answer 12

B05 actuation (switch being held, if RESET light is not lit)

Question 13

What other equipment starts on a CREFAS along with the Control Room Essentials?

Answer 13

SP
EW
EC
CT (A and B)

Question 14

What must be reset prior to resetting CREFAS?

Answer 14

FBEVAS and CPIAS

Question 15

What RU monitors actuate CRVIAS?

Answer 15

CRVIAS doesn’t have field inputs. (manual initiation only)

Question 16

The outside air dampers for the Control Room Essentials are open on a CREFAS. CRVIAS is initiated from B05. What happens to the outside air dampers?

Answer 16

They close. CRVIAS overrides SIAS and CREFAS

Question 17

What happens on a LOP in the BOP-ESFAS?

Answer 17

2/4 logic met on the Class UV relays. Sends signal to DGSS module resulting in a DG start. Signal also sent to Sequencer which generates 1 second Load Shed Pulse to keep from overloading the DG.

Question 18

How long is the LOP signal once generated? Why?

Answer 18

60 seconds

To ensure the sequencer finishes

Question 19

What must happen while changing BOP-ESFAS Sequencer Modes?

Answer 19

The Sequencer must pass through MODE 0 (No Input/Normal)

Question 20

Do you get cross train trips when actuating BOP ESFAS from B05?

Answer 20

No

Question 21

How does a loss of PN power to RU-31 affect BOP-ESFAS?

Answer 21

Full FBEVAS, CREFAS

A loss of a radiation monitor will cause the associated channel to trip. In addition, if the monitor fails high, a trip will be initiated as well.

Question 22

Does having a module in BYPASS prevent actuation from B05?

Answer 22

No - module will actuate regardless of BYPASS position of the module