Systems

Question 1

ECCS Design Criteria

Answer 1

-Peak Cladding Temp <2200F
-17% cladding oxidation
-1% H2 production
-Maintain coolable core geometry
-Maintain long-term core cooling ability

Question 2

ECCS consists of what equipment

Answer 2

-HPCS
-LPCS
-LPCI x3 (RHR)
-ADS valves x7

Question 3

ADS auto-initiation logic

Answer 3

-Low RPV level (-129”)
-Confirm low RPV level (+13”)
-105 second time delay (starts at Level 1)
-LPCS or LPCI available (LPCS >145#, LPCI >125#)

Question 4

What ECCS equipment is on Div 1 and what is the power supply?

Answer 4

-LPCS
-LPCI A
-ADS ‘A’ (DC)
-Power supply is SM-7

Question 5

What ECCS equipment is on Div 2 and what is the power supply?

Answer 5

-LPCI ‘B’
-LPCI ‘C’
-ADS ‘B’ (DC)
-Power supply is SM-8

Question 6

What ECCS equipment is on Div 3 and what is the power supply?

Answer 6

-HPCS
-Power supply is SM-4

Question 7

HPCS initiation signals

Answer 7

-50”, 1.68#

Question 8

LPCS initiation signals

Answer 8

-129”, 1.68#

Question 9

LPCI initiation signals

Answer 9

-129”, 1.68#

Question 10

ADS initiation signals

Answer 10

-129”, +13” (confirm low level), 105 sec time delay, low pressure ECCS pump operating (LPCS 145#/LPCI 125#)

Question 11

Modes of RHR

Answer 11

-Low Pressure Coolant Injection (ECCS Only)
-Containment Spray Cooling
-Suppression Pool Cooling
-Shutdown Cooling

Question 12

When does LPCI pump injection valve receive an open permissive signal?

Answer 12

RPV pressure <470#

Question 13

At what RPV pressure can SDC mode of RHR be used?

Answer 13

RPV press <125#

Question 14

Sources of power to Safety buses

Answer 14

-Main Gen -> TR-N1 -> SM-1/2/3 -> SM-7/4/8
-Offsite power -> TR-S -> SM-1/2/3 -> SM-7/4/8
-Offsite power -> TR-B -> SM-7/8, SM-4 powered by DG-3
-DG-1/3/2 -> SM-7/4/8

Question 15

Spray Pond levels and sources of makeup

Answer 15

-Min Tech Spec: 12.75’
-Low level alarm: 13.0’
-Avg level: 13.0-13.5’
-High level alarm: 14.25’
-Overflow: 14.5’
-If one pond is drained, other GT 13.25’

Question 16

Standby Service Water (SW) pump auto starts

Answer 16

-SW Pump A: RHR pump A start, LPCS Pump start, DG-1 start
-SW Pump B: RHR pump B start, LPCS Pump B or C start, DG-2 start, RCIC-V-45 opens
-HPCS SW Pump: DG-3 start

Question 17

Main Generator ratings

Answer 17

1230 MVA, 25,000 Volts

Question 18

Emergency Diesel Generator ratings

Answer 18

-4160V
-4400KW (DG-1/2)
-2600KW (DG-3)

Question 19

EDG Auto Starts

Answer 19

-DG-1: UV SM-7, RPV -129”, DW 1.68#
-DG-2: UV SM-8, RPV -129”, DW 1.68#
-DG-3: UV SM-4, RPV -50”, DW 1.68#
-EDG req to be at rated speed/voltage in 15 sec (typically 7-10), can be fully loaded in 30 sec (loads auto sequenced)

Question 20

Reactor Closed Cooling (RCC) heat loads

Answer 20

-CTMT: Drywell coolers, RRC pumps (motors, seals, bearings), EDR HX-1
-RB: RWCU (NRHX, pump motor), CRD pumps (seals, bearings), EDR HX-2
-RW: OG Glycol HX

Question 21

Main Steam SRV setpoints

Answer 21

Relief mode: 1091-1131#
Safety mode: 1165-1205#
(RPV design press is 1250#)

Question 22

MSIV auto closure signals

Answer 22

-RPV water level (-129”)
-MSL high steam flow (140%)
-MSL low pressure (831# in RUN)
-Steam Tunnel hi temp (164F) or delta-T (80F)
-Cond low vac (21.6” Hg)