SI signals

Question 1

SI signal

Low PZR pressure

coincident, setpoint

Answer 1

2/3 @ 1715psig

Question 2

Si signal

Hi Steam Line D/P

coincident, setpiont

Answer 2

2/3 detectors on 1/3 lines @ 100psid

Question 3

Si signal

Hi CV Pressure

coincident, Setpoint

Answer 3

2/3 @ 4psig

Question 4

SI signal

Hi Hi CV pressure

coincident, setpoint

Answer 4

2/3 detectors on 2/2 groups @ 10psig

Question 5

SI signal

Hi Steam Line flow

Coincident, setpoint,and what else is needed?

Answer 5

Setpoint is linear, 37.25% to 109% flow from 20-100% power. (1/2 detectors on 2/3 lines)
AND
Low Tavg <543°F on 2/3 loops or
Low steam line pressure of 614psig 2/3 S/Gs

Question 6

SI signals

Manual

Answer 6

1/2 pushbuttons

Question 7

What SI signal does 2000psig block

Answer 7

Hi steam line DP and PZR low pressure

Question 8

What SI signals does the Tavg block at what temperature?

Answer 8

High steam line flow and Hi-Hi CV pressure when Tavg >543 (2/3 loops)

Question 9

At low power what part of the High Steam line flow signal are we closer too?

Answer 9

At 0% power we are closer to Tavg of 543

Question 10

At high power what part of the high steam line flow signal are we closer too?

Answer 10

At 100% we are closer to Steam line pressure of 614psig.

0%-1000psig
100%-800psig

Question 11

SI signal causes what?

SPAREFCCC

Answer 11

• Safeguard sequence actuation
• Phase A and IVSW
• AFW
• Reactor Trip
• EDGs
• Feedwater Isolation
• Cv ventilation Isolation
• Control Room Pressurization
• CLose normal dampers

Question 12

How long before SI signal can be reset? what lets you know?

Answer 12

2 minutes, white light above EDGs

Question 13

Auto Spray will do what?

Answer 13

Phase B
Spray
SI actuation
Steam line Isolation

Question 14

Man. spray will do what?

Answer 14

Spray
Phase B
CV ventilation isolation

Question 15

SI valves that move:

Answer 15

RHR-744A/B (RHR Hx Outlet)
SI-870A/B (Bit Outlet)

Question 16

SI valve power supplies?

Answer 16

A/B/C/D
MCC-5/6/5/6
except SI-866A/B

Question 17

Feed water isolation signals?

Answer 17

SI
Rx with Tavg<554
S/G high lvl

Question 18

SI feedwater isolation does what?

Answer 18

All valves close, MFP trip, Turbine trip

Question 19

Rx trip feedwater isolation does what?

Answer 19

Closes all FRV

Question 20

High level S/G Feedwater isolation does what?

Answer 20

All valves close on effected S/G, Trips MFPs, and turbine. Trips Rx if above P-8