Containment Flashcards
What are the functions of Containment?
- Limits the release of fission products
- Provides biological shielding.
- Provides source of water for recirc
What is the purpose of the Divider Barrier seal?
- prevents flow of steam and air from bypassing the ice condenser
What actuates a Cntmt Vent Isolation [CVI]?
- High Radiation
- SI (1# in Lower Ctmnt)
- Manual Phase A switch
- Manual phase B switch
- Manual
What Hydrogen concentration do the Hydrogen Recombiners maintain?
< 4%
What are the Cntmt Temp bands? [T.S. 3.6.5]
- Upper 60°F-100°F
- Lower 60°F-120°F
Basis: - HI Temp Limit - equipment concerns
- Low Temp Limit - more mass still remain < 12#
Can you enter Ctmnt doors to do repairs if you are in the TS for doors being inop?
- Yes
If Divider Barrier Seal Integrity is lost how long do you have to get it back? (TS 3.6.13 A)
- One or more personnel access doors or equipment hatches open or inoperable
WITHIN 1 HR: - restore to OPERABLE and closed
If the Cntmt Recirc Drains are INOP how long do you have to restore them? (TS 3.6.14)
- Within 1 Hr
What causes a Cntmt Phase A Isolation?
- SI (1# in Lower Ctmnt)
- Manual
- If manually actuated, Causes CVI
What causes a Cntmt Phase B Isolation?
- 2.8# in Lower Ctmnt
- Manual
- If manually actuated, Causes CVI
What does TS 3.6.2 A (Airlock) State?
1.One or more ctmnt air locks with one or more cmnt air lock doors inoperable
WITHIN 1 HR:
- Verify the Operable door is closed in the affected air lock
What does TS 3.6.1 A (Ctmnt) State?
- If Ctmnt becomes inop
WITHIN 1 hr - restore to operable
How many Refueling Canal Drains must be operable?
- 2 of 3
How are the Refueling Canal Drains sized?
- Sized to allow sufficient flow back to the recirculation sump and minimize steam bypassing the Ice Condenser
What does TS 3.6.3 B (Ctmnt Isolations) State?
- If 1 or more ctmnt penetrations/flowpaths are inop
WITHIN 1 HR: - Isolate flow path
When are all access hatches through the barrier closed in Ctmnt?
- All access hatches through barrier are closed when RCS > 200°F
What does TS 3.6.2 B (Airlock) State?
- One or more ctmnt air locks with ctmnt air lock interlock mechanism inoperable
WITHIN 1 HR: - Verify an Operable door is closed in the affected air lock
What does TS 3.6.2 C (Airlock) State?
- One or more ctmnt air locks inoperable for reasons other than Condition A or B
IMMEDIATELY: - Initiate action to evaluate overall ctmnt leakage rate per LCO 3.6.1
AND
WITHIN 1 HR - Verify a door is closed on the affected air lock
What does TS 3.6.4 A (Ctmnt #) State?
- Containment pressure not within limits -1.5 < # < +0.3 WITHIN 1 HR - Restore ctmnt # to within limits BASIS: - High Limit Keeps us below design limit of 12# - Low Limit Ensures that the design neg diff pressure is not exceeded
What does TS 3.6.12 A (Ice Condenser Doors) State?
- One or more condenser inlet doors inoperable due to being physically restrained from opening
WITHIN 1 HR - Restore inlet doors to operable status
What does TS 3.6.13 B (Divider Barrier) State?
- Divider Barrier Seal INOP
WITHIN 1 HR: - Restore to operable
What does TS 3.6.14 A (Ctmnt Recirc Drains) State?
- One ice condenser floor drain inoperable
WITHIN 1 HR: - Restore ice condenser floor drain to Operable status
What does TS 3.6.14 B (Ctmnt Recirc Drains) State?
- One required refueling canal drain inoperable
WITHIN 1 HR: - Restore required refueling canal drain to Operable status
What does TS 3.6.14 C (Ctmnt Recirc Drains) State?
- One required CEQ fan room drain inoperable
WITHIN 1 HR: - Restore required CEQ fan room drain to Operable status
What does TS 3.6.14 D (Ctmnt Recirc Drains) State?
- One flood-up overflow wall flow path inoperable
WITHIN 1 HR: - Restore flood-up overflow wall flow path to Operable status
Why do we use Sodium Tetra-borate in the ice in the ice condenser?
- To keep iodine in solution post accident (keeps water at high pH)
How much pressure is needed to open the lower deck doors to the ice condenser?
- 1 p/sf
What does Ctmnt Penetrat. and Channel Press. System do for us and which one is still in service?
- Zone 3, Electrical Penetrations and the system maintains positive pressure on the containment electrical penetrations to prevent moisture intrusion.
Which radiation monitors close inside ctmnt isolation valves?
- Odd numbered Radiation monitors close 100 series (inside ctmnt iso valves) and CIPS Fan
Which radiation monitors close outside ctmnt isolation valves?
- Even numbered Radiation monitors close 200 series (Outside ctmnt iso valves) and rest of Ctmnt Vet Supply Fans
What are the RCS leak detection monitors in ctmnt?
- Humidity (Dew Point)
- Sump Flows (Sump Pump Run Time Meters)
- Radiation Monitors (Gaseous and Particulate)
- –> Unit 1 combines Humidity and Gaseous Rad Waste. Particulate is a sole rad monitor
- –> Unit 2 combines Radiation Monitors (Gaseous and Particulate)
Where are the requirements for the containment Leak rate testing program (SR 3.6.1.1 and SR 3.6.2.1) discussed?
- Section 5.5.14 describes the containment leakage rate testing program
- 0.25% of containment air weight per day
- Peak # < 12#
