CP Containment Purge

Question 1

Draw a simplified diagram of the Containment Purge system.

Answer 1

(see EO 1.1)

Refueling Purge Normal AHU (CPNA01)
• Refueling Purge Normal AHU Discharge Dampers (CPNM02A and M02B)
• Refueling Purge Containment Isolation Dampers (CPAUV2A, UV2B and
CPBUV3A, UV3B)
• Refueling Purge Exhaust Fans (CPNJ01A and J01B)
• Refueling Purge Exhaust Dampers (CPNM05A and M05B)
• Power Access Purge Normal AHU (CPNA02)
• Power Access Purge Supply Dampers (CPNM03 and M07)
• Power Access Purge Containment Isolation Dampers (CPAUV4A, UV4B and
CPBUV5A, UV5B)
• Power Access Purge Valve (CPNPV43)
• Power Access Purge Exhaust AFU (CPNJ02)
• Power Access Purge Exhaust Damper (CPNM06)
• Refueling Purge Radiation Monitor RU34
• Power Access Purge Train “A” Radiation Monitor RU37
• Power Access Purge Train “B” Radiation Monitor RU38
• Connection to the Plant Vent

Question 2

What are the functions of the Containment Purge system?

Answer 2

The CP system:

• provides an environment required for safe access (refueling and online)
• limits dose rates inside Containment,
• maintains pressure
• monitor and stop a release during a fuel handling accident or LOCA

Question 3

The Containment Purge system is used to maintain nitrogen cover gas on the steam generators during wet layup conditions.

True of False?

Answer 3

True

The GA System uses a regulator to releases nitrogen into the CP System during the time that a cover gas is being maintained within the Steam Generators.

(EO 1.5)

Question 4

What is the completion time for Tech Spec 3.6.3 Containment Isolation Valves, condition B, two required isolation valves INOP?

Answer 4

1 hour

Question 5

What actions occur on a high alarm on RU-38, ‘B’ Power Access Purge Radiation monitor?

Answer 5

Ru 37/38 provide signals to be used by BOP ESFAS for the generation of a CPIAS, which would close all of the Containment isolation valves in the CP System.

(EO 1.4)

Question 6

The Fire Protection System would be used (via a fire hose) to extinguish a fire in the charcoal filter of the:

A. Refueling Purge Normal Exhaust AHU

B. Power Access Purge Normal Exhaust AHU

C. Refueling Purge Essential AHU

D. Power Access Purge Essential AHU

Answer 6

B. Power Access Purge Normal Exhaust AFU

(EO 1.4)

Question 7

The Containment Purge system is used to maintain a Nitrogen cover gas on the Main Steam System.

True or False?

Answer 7

True

The CP System is used to maintain the nitrogen cover gas on the Steam Generators during wet
layup conditions. The GA System uses a regulator to releases nitrogen into the CP System during
the time that a cover gas is being maintained within the Steam Generators.

(EO 1.5)

Question 8

Tech Spec 3.9.3, Containment Penetrations, is applicable during Modes 1 through 4.

True or False?

Answer 8

False

APPLICABILITY: During CORE ALTERATIONS,
During movement of irradiated fuel assemblies within containment.

(EO 1.18)

Question 9

What is the pressure band for Containment pressure per Tech Spec 3.6.4, Containment Pressure?

Answer 9

3.6.4 Containment Pressure
LCO 3.6.4 Containment pressure shall be

> -0.3 psig and < +2.5 psig.
APPLICABILITY: MODES 1, 2, 3, and 4.
ACTIONS - COND ITION REQUIRED ACTION COMPLETION TIME 1 hour
A. Containment pressure not within limits.
A.1 Restore containment pressure to within limits.
(EO 1.19)