Containment Flashcards
Operational design basis of containment: (4 items)
Max internal pressure 50#
Max internal test pressure 57.5#
Max external pressure @-3.5 #
Max internal temp = 280F
Design basis accident is _____.
Peak containment pressure ____.
Double ended guillotine shear of a cold leg.
U1 42.8#
U2 38.4#
Purpose of containment
To contain fission products and other radioactive material and prevent their release to the environment under normal and abnormal conditions.
Electrical penetrations are pressurized with ______.
Nitrogen
What is the purpose of the primary shield wall?
Forms the reactor cavity, acts as biological shield, and provides support to reactor vessel.
10CFR50.67 guidelines
For 2 hours at the Exclusion boundary
-25REM whole body
-300REM thyroid
For entire passage of the cloud at LPZ boundary
-25 REM whole body
-300 REM thyroid
How can we limit the pressure rise in containment from a faulted steam generator?
AF flow must be isolated within 30 minutes to meet containment temp and pressure criteria
How many TS containment pressure sensors?
What functions do they control?
4-934, 935, 936, 937
1. Hi alarm at 0.8#
2. SI on 2/3 >3.4#
3. MSIV isolation on 2/3 >8.2#
4. CS actuation 2/4 >20#
5. Phase B 2/4 >20#
What causes a CVI signal?
Any SI
Manual Phase A
Hi rad (AR11/12)
Manual Phase B/CS actuation
What valves are closed by CVI?
(All start with 1 or 2VQ)
001a/b purge supply
002a/b purge exhaust
003 post loca purge
004a/b mini purge supply
005a/b/c mini purge exhaust
1PR0011A and B are the ______
Particulate and gaseous radiation monitors
Equipment hatch is sized for _____
Passage of the reactor vessel upper head sealing O ring during refueling operations.
What is the design temperature of containment?
280F
Basis of low pressure limit____
Basis of high pressure limit____
Inadvertent Containment spray actuation
DBLOCA
Basis for high containment temperature limit_____
Maintain containment <280F after SLB
Emergency exit through emergency personnel hatch – used ______ and located_____.
during outages for access to containment from the containment access facility
Unit 1 is at 99.7%. A small break LOCA occurs, resulting in a reactor trip and SI. What is response of VP chilled water system?
WO containment isolation valves close on the Phase A.
WO Pumps trip on WO valve position.
VP chiller trips on low WO flow.
1sx114a/b and 112a/b close
1sx147a/b open
