Primary sampling system

Question 1

Primary samples cooled by ____.
How many samples can be drawn at one time?

Answer 1

CCW
Only one, CCW runs in series to coolers so only one cooled at a time

Question 2

What is the purpose of the delay coil? Which sample points have delay coils?

Answer 2

Provides >45 second transit time to allow decay of short lived isotopes, especially N16.
Type B, means has contact with core, delay coil in containment, RCS hot and cold legs.

Question 3

What sample points are isolated on SI/phase A isolation?

Answer 3

RCS hot and cold legs
PZR liquid and vapor space
Accumulators
Post hydrogen monitor
SG blowdown
Cntmt air sampling valves
RF sump

Question 4

What components are affected by loss of IA?

Answer 4

Same as Phase A/SI except the post accident h2 monitors not affected.

Question 5

What are the three modules of the 1PS25J?

Answer 5

Reactor coolant liquid sample module
Demin liquid sample module
Radwaste liquid sample module

Question 6

Post hydrogen sample monitor is required to be activated within ____ minutes following_____.

Answer 6

30 minutes
SI

Question 7

The only two points sampled at the demin liquid module are ___ and ___.

Answer 7

SI accumulators
LDHXs

Question 8

Arrangement of the Hydrogen monitor isolation solenoid valves is such that on a loss of a DC bus, _______.

Answer 8

one train will remain in service because one valve in each flow path fails as is.

Question 9

Why are the post accident hydrogen monitors left continually in standby?

Answer 9

To meet the NUREG activation time requirement of 30 minutes after an SI in conjunction with the needed warm up time (10-20 minute) for proper operation.

Question 10

What are the limits for Xe and I for LCO 3.4.16?

Answer 10

Xe-133 <=603 uci/gm
I-131 <=1.0 uci/gm