E31 Leak Detection

Question 1

What’s the purpose of leak Detection?

Answer 1

Consists of temperature, flow, level, and pressure sensors to detect, alarm, and sometimes isolate leakage

Question 2

When will RCIC isolate?

Answer 2

Group 4
RCIC manual isolation initiation
Rx pressure low 60 psig
Exhaust diaphragm pressure Hi 10psig
Steam flow Hi
Steam leak detection - 165°F RHR Room / 185°F RCIC and MSL

Question 3

Why is there a 30 minute TD for the MSL temp isolation for RCIC? -

Answer 3

Allows main steam line and RWCU to isolate prior to isolate RCIC prolongs the availability of reic as a make Up source to the vessel and prevents unnecessary isolation of RCIC if the leak is from MSL OR RWCU

Question 4

Where does identified leakage drain to?

Answer 4

Equipment drains

Question 5

Where does unidentified leakage drain to?

Answer 5

Floor drains

Question 6

When will rwcu isolate?

Answer 6

Group 8

Question 7

Where does unidentified leakage come from?

Answer 7

CRD flange / Valve flange / Drywell cooling units

Question 8

When will MSIVs isolate?

Answer 8

Group 1

Question 9

What is identified leakage

Answer 9

Valve stems
Recirc pump seals
Reactor Head flange
Fuel pool seal
Other equipment routed to equipment drains

Question 10

When is the ECCS Line break detection indication valid?

Answer 10

Reactor Power >80%

Core flow 790%