Ex Cores

Question 1

Ex-core control channels sense neutrons with...
A.  Rhodium detectors.
B.  U-235 fission chambers.
C.  BF3 proportional counters.
D.  Uncompensated ion chambers.

Answer 1

D

Question 2

Ex-core startup channels sense neutrons with...
A.  Rhodium detectors.
B.  U-235 fission chambers.
C.  BF3 proportional counters.
D.  Uncompensated ion chambers.

Answer 2

C

Question 3

Ex-core safety channels sense neutrons with...
A.  Rhodium detectors.
B.  U-235 fission chambers.
C.  BF3 proportional counters.
D.  Uncompensated ion chambers.

Answer 3

B

Question 4

Unit 1 is at 100% power with all systems in a normal lineup.
Ex-core safety channel A middle detector output fails low.
Channel A log power will read ___(1)___ and linear power will read ___(2)___.
A. (1) 100%; (2) 50%
B. (1) 0%; (2) 50%
C. (1) 100%; (2) 67%
D. (1) 0%; (2) 67%

Answer 4

D

Question 5

Unit 1 is at 100% power with all systems in a normal lineup.
Ex-core safety channel B lower detector output fails low.
Channel B log power will read ___(1)___ and linear power will read ___(2)___.
A. (1) 100%; (2) 50%
B. (1) 0%; (2) 50%
C. (1) 100%; (2) 67%
D. (1) 0%; (2) 67%

Answer 5

C

Question 6

What provides cooling for the ex-core NI detectors?
A.  Normal Chilled Water
B.  CEDM ACUs
C.  Reactor Cavity Fans
D.  Nuclear Cooling Water

Answer 6

C

Question 7

Unit 3 is at 100% power with all systems in a normal lineup.
Power has been held at 100% for a month.
Provided plant personnel have not affected the ex-core nuclear detectors during that time, indicated ex-core power has…
A. raised due to neutron flux shifting to the outer regions of the core.
B. lowered due to increased absorption of neutrons in the moderator.
C. lowered due to reduced capability of ex-core detectors to respond to ionizing events.
D. raised due to the buildup of transuranic elements in the fuel pins.

Answer 7

A

Question 8

The startup channels are required to be operable in mode(s)...
A.  6 ONLY
B.  1, 2, 3, 4, 5, and 6
C.  3, 4, and 5 ONLY
D.  3, 4, 5, and 6 ONLY

Answer 8

D

Question 9

Unit 1 is in Mode 2. A normal reactor startup is in progress.
A startup channel will give a control room alarm when its indication reaches…
A. 2000 cpm. At this point, the control room staff will energize the log power safety channels.
B. 2000 cpm. At this point, the control room staff will de-energize the startup channel detectors.
C. 2000 cps. At this point, the control room staff will energize the log power safety channels.
D. 2000 cps. At this point, the control room staff will de-energize the startup channel detectors.

Answer 9

D