Hydrogen Control

Question 1

Unit 1 is in Mode 1.
‘A’ Hydrogen Recombiner is declared inoperable to support scheduled maintenance on cooling fan inlet damper HPA-M01.
The Hydrogen Purge Exhaust AFU is inoperable to support a filter replacement.
Unit 2 is in Mode 1. Which LCOs must Unit 2 enter?
A. None
B. LCO 3.6.100 condition A ONLY
C. LCO 3.6.300 condition A ONLY
D. BOTH LCO 3.6.100 condition A AND LCO 3.6.300 condition A.

Answer 1

A

Question 2

Which of the following is the dominant source of hydrogen in the Containment following a LOCA?
A. Radiolytic decomposition of water in the reactor vessel
B. Corrosion of aluminum and zinc in the Containment
C. Dissolved hydrogen in the reactor coolant
D. Zirconium-water reactions

Answer 2

D

Question 3

Before placing the 'A' train Hydrogen Analyzer in service, how many Containment Isolation Valves must be opened?
A.  zero
B.  two
C.  three
D.  four

Answer 3

C

Question 4

The necessary differential pressure to drive containment air flow through the Hydrogen Purge Exhaust AFU is provided by:
A. either train Hydrogen Recombiner Regenerative Blower.
B. the Hydrogen Purge Exhaust fan.
C. Nitrogen from the Service Gas header
D. Service Air

Answer 4

D

Question 5

Control Room annunciator window 2A05A, H2 ANAL CH TRBL, can alarm on which of the following sets of conditions?
A. Power failure, low hydrogen analyzer sample flow, high hydrogen analyzer temperature
B. High methane flow, high control room temperature, relief unavailable
C. Low hydrogen analyzer temperature, low hydrogen analyzer span gas pressure, low hydrogen analyzer oxygen pressure.
D. Low hydrogen analyzer sample flow, low hydrogen analyzer hydrogen pressure, power failure.

Answer 5

C