Reactor vessel and internals

Question 1

How many reactor vessel head penetrations, and what are they?

Answer 1

(79 total)
53 active RCCA
18 RCCA spares
2 RVLIS
5 CETCs
1 Head vent

Question 2

Core bypass flowpaths:

Answer 2

1. 2.3% head bypass
2. 2.0% thimble bypass
3. 1.0% nozzle bypass
4. 0.5% baffle bypass
5. 94.2% main coolant flow

Question 3

Reactor load transmittal flowpath:

Answer 3

1. From fuel assembly to
2. Lower core plate to
3. Lower support columns to
4. Core support plate to
5. Core barrel to
6. Vessel flange
7. Nozzle support pads

Question 4

Reactor vessel flange high leakoff temperature:

Answer 4

140F, directed to RCDT

Question 5

Head vents are two pairs valves in (parallel/series) path operated from _________. Solenoid operated valves will fail____.

Answer 5

-Parallel
-PM011J
-Closed
Normally used to vent non condensable gases and vent path for RCS drain and fill. May be used for H2.

Question 6

Reactor head vent temp high is located_____ of the vent valves and will alarm at ______.

Answer 6

Downstream; 170F

Question 7

Rx vessel head vents TLCO

Answer 7

3.4 REACTOR COOLANT SYSTEM (RCS)
3.4.e Reactor Vessel Head Vents
TLCO 3.4.e Two reactor vessel head vent paths, each consisting of two
valves in series powered from emergency buses, shall be
OPERABLE and closed.
APPLICABILITY: MODES 1, 2, 3, and 4.

Can operate indefinitely with one inoperable.
Close the valve and remove power immediate actions.

Question 8

Anytime primary or secondar coolant temp is <= ______, reactor and secondary coolant pressures shall be <=______.

Answer 8

70F

200 psig

Question 9

Where does leakoff from vessel flange o rings go to?

Answer 9

RCDT

Question 10

How many penetrations are in the lower head?

Answer 10

58 incore NI penetrations