Containment

Question 1

Operational design basis of containment: (4 items)

Answer 1

Max internal pressure 50#
Max internal test pressure 57.5#
Max external pressure @-3.5 #
Max internal temp = 280F

Question 2

Design basis accident is _____.
Peak containment pressure ____.

Answer 2

Double ended guillotine shear of a cold leg.
U1 42.8#
U2 38.4#

Question 3

Purpose of containment

Answer 3

To contain fission products and other radioactive material and prevent their release to the environment under normal and abnormal conditions.

Question 4

Electrical penetrations are pressurized with ______.

Answer 4

Nitrogen

Question 5

What is the purpose of the primary shield wall?

Answer 5

Forms the reactor cavity, acts as biological shield, and provides support to reactor vessel.

Question 6

10CFR50.67 guidelines

Answer 6

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

Question 7

How can we limit the pressure rise in containment from a faulted steam generator?

Answer 7

AF flow must be isolated within 30 minutes to meet containment temp and pressure criteria

Question 8

How many TS containment pressure sensors?
What functions do they control?

Answer 8

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#

Question 9

What causes a CVI signal?

Answer 9

Any SI
Manual Phase A
Hi rad (AR11/12)
Manual Phase B/CS actuation

Question 10

What valves are closed by CVI?

Answer 10

(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

Question 11

1PR0011A and B are the ______

Answer 11

Particulate and gaseous radiation monitors

Question 12

Equipment hatch is sized for _____

Answer 12

Passage of the reactor vessel upper head sealing O ring during refueling operations.

Question 13

What is the design temperature of containment?

Answer 13

280F

Question 14

Basis of low pressure limit____
Basis of high pressure limit____

Answer 14

Inadvertent Containment spray actuation

DBLOCA

Question 15

Basis for high containment temperature limit_____

Answer 15

Maintain containment <280F after SLB

Question 16

Emergency exit through emergency personnel hatch – used ______ and located_____.

Answer 16

during outages for access to containment from the containment access facility

Question 17

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?

Answer 17

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