N2 and H2 System

Question 1

How is a break in the H2 distribution header combated?

Answer 1

Flow fuse- excess flow check valve will shut if flow exceeds normal flow rate

Question 2

What is the concentration of H2 that will support combustion when mixed with O2?

Answer 2

4-75%

Question 3

Major loads on N2 and H2 system?

Answer 3

N2- Press accumulators (SI)
     - b/u pneumatic control for HCV-142 (seal inj)
     - 8152 helb CIV
     - 8145 aux spray 
     - 8146 normal charging 
     - 8147 alternate charging 
     - 8148 aux spray bypass
     - PCV-456 class 1 Pzr PORV 
     - PCV-455C class 1 Pzr PORV 
H2- VCT cover gas (scavenge oxygen)
     - Generator cooling

Question 4

Layout of N2 storage and distribution system?

Answer 4

Liquid N2 tank (tank w/in tank, vacuum)(