Engineered Safeguards

Question 1

ECCS acceptance Criteria
HOTCC

HOTCC

Answer 1

• H2 production <1%
• Oxidation <17%
• Temperature of cladding <2200 degrees
• Coolable geometry
• Cooling long-term

Question 2

SI block with pressure

Answer 2

When less than 2000psig
Low Pressure in PZR (1715psig)
Hi Steam Line D/P (100psig)

Question 3

SI block with Tave

Answer 3

When 543 degrees
Hi Steam line flow
Hi-Hi CV pressure

Question 4

Actions caused by SI

SPARE FCCC

Answer 4

• Safegaurd sequence Actuation
• Phase A and IVSW
• AFW Autostart
• Reactor Trip
• EDGs
• Feedwater Isolation
• CV ventilation isolation
• Control Room Pressurization
• Close Normal dampers on HVH-1-4

Question 5

Resetting auto SI signal

Answer 5

• If SI reset button pressed before 2 mins, 2 minutes must pass from time of signal before EDG white light extinquish and SI is reset
• If Si reset button pressed after 2 mins then there is no wait

Question 6

Resetting Manual SI

Answer 6

Must wait 2 minutes before pressing reset button. Unlike Auto signal the button cannot be pressed before 2 minutes.

Question 7

Do components reposition after a SI signal is reset?

Answer 7

No, components do not reset

Question 8

What signals must be reset individually?

Answer 8

Phase A
Phase B
HVH dampers
IVSW
CV ventilation isolation
Feedwater isolation

Question 9

SI valves

which reposition

Answer 9

SI-867 A/B BIT inlets open
SI-870 A/B BIT outlets Open-Move
SI-841 A/B BIT Recirc to RWST Closed
SI-865 A/B/C Accumulator Oulets open
RHR-747 A/B RHR cold leg injection Open-Move

Question 10

Interposing Relays are powered from?

Answer 10

IB-7A Train A
IB-3 Train B

Question 11

Automatic Spray signal does what?

Answer 11

• Spray Actuation
• Phase B
• SI signal
• Steam Line Isolation

Question 12

Manual Spray signal does what?

Answer 12

• Spray Actuation 2/2
• Phase B
• CV Ventilaition Isolation

Question 13

CV Ventilation Isolation does what?

Answer 13

Shuts:
CV Purge Valves
Pressure Relief Valves
Vacuum Relief Valves

Question 14

Phase B valves

Answer 14

CC-716A-CC to RCP A/B/C and CRD Cool isolation
CC-716B-CC to RCP A/B/C and CRD Cool Isolation
cvc-381- RCP Seal Water Return * Important*
CC-735- CC from RCP A/B/C thermal barrier isolation
CC-730- CC from RCP A/B/C oil cool isolation
FCV-626- CC From RCP A/B/C thermal Barrier isolation

CCW to Containment basically

Question 15

Steam Line isolation SI singals

Answer 15

Hi-Hi CV pressure (10psig)
High Steam Flow with Low stm line press or low tavg

Question 16

Steam LIne Isolation is what?

Answer 16

Closure of MSIVs

Question 17

Feedwater Isolations

Answer 17

• Reactor Trip with Tavg <554
• Hi-Hi SG lvl (2/3 on 1/3 @ 75%)
• SI Actuation

Question 18

Reactor Trip with Tavg <554 degrees does what to feedwater?

Answer 18

Shuts all FRVs

Question 19

Hi-Hi S/G Level does what to feedwater?

Answer 19

• Shuts FRV and FRV Bypass and FW-9 for respective S/G
• Trips both MFPs
• Trips the Turbine

Question 20

SI actuation does what to Feedwater?

Answer 20

• Shuts all FRV, FRV bypass, FRV Block and FW-9s (S/G inlet bypass valves)
• Trips both MFPs
• Trips the Turbine

Question 21

Must have 2 channels per E bus for UV and 3 channels per E bus for UF

Answer 21

Loss of 1 UV, restore within an hour
Loss of 2 UF, restore at least 1 within an hour
If above times cannot be met then declare EDG inop.