Systems Exam 5 Full Comprehensive Deck for Review Flashcards

Question

If SSPS is in TEST with the IEI Switch in INHIBIT...

Answer 1

→SI will NOT function with either an automatic or manual signal for that train →a manual Rx Trip will still trip all closed Rx Trip breakers →an automatic Rx Trip will open the unaffected Rx Trip and Bypass breakers (i.e. Train A being in "Test" will prevent RTA and BYB from opening) Note: the RO should re-block all blocks via the Control Board during SSPS testing after Permissives and Memories but before IEI is returned to "Normal." Otherwise, the blocks may not be in effect, so could result in a Rx Trip.

Answer 2

→NORMAL - aligns ground path to allow system to operate normally →INHIBIT - removes ground path from system and prevents circuits from actuating →INHIBIT will not prevent Rx Trip; only prevents any external signals other than manual from being input into SSPS →INHIBIT will still allow manual ESF for that train Note: CVI input does not go through the Input Error Inhibit switch, so it is the only automatic actuation that will occur in "Inhibit."

Answer 3

→inputs to the AUTO SI BLOCK circuit (Rx Trip breakers must be cycled **closed** in order to remove the block after the initial SI actuation) →inputs to the Lo T-ave and P-4 Feedwater Isolation circuit →inputs to the logic card that causes an SI or P-14 signal to seal-in Feedwater Isolation until P-4 is reset

Answer 4

On a Reactor Trip, the shunt trip relay will de-energize, which closes a Normally Open contact to energize the Shunt Trip Coil, which will forcefully trip the breaker 125 VDC uED1-1 or uED2-1 required for shunt coil to function

Answer 5

→supplies current to undervoltage coil of the Reactor trip and bypass breakers of the rod control system →on a loss of input voltage, the UV Card provides a ground path for the UV and Shunt Trip coils causing them to de-energize and therefore actuate → **a 15 V Threshold Cutout Circuit monitors the 15 VDC supplied to the UV driver card and will stop the UV driver card from outputting 48 VDC if the 15 VDC bus drops to <12.7 Volts**

Answer 6

In general, the Input Relays are de-energized to actuate except for: →RWST Lo-Lo Level →Hi-3 Containment Pressure →P-6. This is done to ensure that those actuations do not occur on a loss of power because they could have detrimental effects on the plant if actuated when not required.

Answer 7

→Power Supply Loss: Either of the 48 VDC or either of 15 VDC →Circuit card not properly inserted (except the Isolation cards A 503-506) →MULTIPLEXER SWITCH in INHIBIT →LOGIC A Switch NOT in the "OFF" position →PERMISSIVES Switch NOT in the "OFF" position →MEMORIES Switch NOT in the "OFF" position →MASTER RELAY SELECTOR Switch NOT in the "OFF" position →INPUT ERROR INHIBIT switch in the "INHIBIT" position → **Bypass breaker connected and shut** → **MODE SELECTOR, slave relay test, switch in the "TEST" position** (unless S604 is in MODE 5/6) →Loss of 118 VAC power to either output cabinet Note: →a GW on the Train in test will cause a reactor trip if the opposite Train receives a GW for any of the above →if below P-9 (<50%), there is no light on the first out panel →if above P-9 (>50%) there is a first out light for "Reactor Greater than 50% Power Turbine Trip"

Answer 8

→the P-4 signal that trips the Main Turbine (either train's P-4) →the P-4 signal that places Steam Dumps into the Plant Trip Controller (Tr. B P-4) →the P-4 signal that goes to the SER (either train's P-4) to cause the PCIP "Rx Trip Perm P-4" window 1.5 to light

Answer 9

Bypass breakers receive a shunt trip on a **manual** Rx Trip, but not with an automatic trip. (only receive UV trip with an automatic trip) Rx Trip Breakers receive UV and shunt trip on both automatic and manual trips.

Answer 10

SSPS General Warning: →Train **A** Bypass Breaker gives a Train **A** General Warning →Train **B** Bypass Breaker gives a Train **B** General Warning Reactor Trips: →Train **A** Rx Trip Breaker sends trip signal to Train **B** Bypass Breaker →Train **B** Rx Trip Breaker sends trip signal to Train **A** Bypass Breaker

Answer 11

**Both** switches must be turned to the actuate position at the same time for the actuation to take place. (CB-02 or CB-07)

Answer 12

→ **NORMAL** - allows Train A or B to cause trip indication for the TSLB → **INHIBIT** - data from the associated train isn't sent to multiplexer (prevents affected train from inputting to PCIP, TSLBs, and ALBs) → **A + B** - allows input from both trains to the multiplexer →normally, one train is in "Normal," and the other is in "A + B" →TSLBs and PCIP window will blink if multiplexers don't agree (i.e. 1 train of SSPS didn't actuate)

Answer 13

→input from external systems first comes into the Input Bays →bays are physically and electrically independent →powered by associated protection channel (uPC1-4 for Bays 1-4) →Input Bays supply power to respective channel field contacts for Turbine Trip (HP Stop & EHC Pressure), RCP UV, and RCP UF trips (when field contact trips, causes input relay to de-energize)

Answer 14

→both switches will trip the breakers →switch on CB-10 will NOT close them; it can only trip

Answer 15

→a Bypass breaker being connected and closed causes a General Warning signal on its associated train →when closing a second Bypass breaker, the second breaker will close momentarily, which will cause a General Warning signal on the second train →General Warning on both trains will cause a Rx Trip by de-energizing the UV trip coils on all Rx Trip and Bypass breakers and energize the shunt trip relays on the Rx Trip breakers

Answer 16

...the Sequence Events Recorder (SER).

Answer 17

→No, DRMS inputs go directly to logic cards. →to block DRMS actuation signals, block hand switches are installed on the relevant rad monitors

Answer 18

→each train of SSPS contains two dual voltage power supplies (15 and 48 volt) →redundant supplies are auctioneered to form one 48 VDC and one 15 VDC bus →Train A has two 15 VDC and two 48 VDC power supplies →the loss of any of the four output voltages will give a General Warning Alarm on the Train and on the Main Control Board

Answer 19

Train A: →DC power supply comes from Input Bays 1 and 3 (uPC1 and 3) →slave (output) relays powered from uPC1 →loss of uPC1 means Train A slave relays will NOT actuate Train B: →DC power supply comes from Input Bays 2 and 4 (uPC2 and 4) →slave (output) relays powered from uPC2 →loss of uPC2 means Train B slave relays will NOT actuate Note: →48 VDC is for Master Relays →15 VDC is for Testing Relays →118 VAC is for Slave Relays

Answer 20

→output from 7300 →NIS →field contacts

Answer 21

→inputs go to Universal Logic Cards →if coincidence is met, generates an output signal for either Rx Trip or ESF →Rx Trip signals are sent to the UV Card, which de-energizes the UV Coils and Shunt Trip Relay, causing Rx Trip →ESF Signals are sent to the Safeguards Driver Cards, which energize Master Relays, which then energize Slave Relays →in some cases, the Slave Relays will input back into other Logic Cards to generate other logic (e.g. generating Rx Trip on an SI)

Answer 22

→NORMAL - no effect →MODE 5/6 - allows CVI to operate Note: if both trains put switch in MODE 5/6, will cause Rx Trip. However, should be in Mode 5 or 6 already if the switch has been placed in that mode.

Answer 23

N-41 Fails High →C-2 blocks Auto and Manual Rod withdrawal →N-41/42/43/44 can be de-selected at NI drawer PT-505 Fails Low →T-ref goes to 557°F →C-5 blocks Auto rod withdrawal; turbine load appears to be <15% →Control Rods step in if in auto (if PT-505 or Both selected) →one channel of T-ave fails low, causing Ave T-ave to drop →power mismatch circuit sees rapid load reduction to 0% turbine load

Answer 24

N-42 Fails High →C-2 blocks Auto and Manual Rod withdrawal →cannot be bypassed, loss of power to Aux. Relay Rack 3 →C-5 blocks Auto rod withdrawal →Control Rods step in if in auto and PT-506 selected for control

Answer 25

C-2 blocks Auto and Manual Rod withdrawal

Answer 26

→FWPT speed decreases due to total steam flow reference decreasing →flow remains stable to slightly decreasing →decreasing trend in SG levels for SG 1 & 4

Answer 27

→FWPT speed decreases due to total steam flow reference decreasing →flow remains stable to slightly decreasing →decreasing trend in SG levels for SG 2 & 3

Answer 28

If 459 selected for control (459/460 or 459/461): →Letdown isolates →heaters off →charging flow increases

Answer 29

If 460 selected for control (459/460 or 461/460): →Letdown isolates →heaters off

Answer 30

If 461 selected for control (459/461 or 461/460): →Letdown isolates →heaters off

Answer 31

IF PT-455 selected for control (455/456 or 455/458): →Spray control lost in Auto →PCV-455A not available in Auto **Note: No ECCS slave relays can actuate on Train A.**

Answer 32

PCV-456A not available in Auto **Note: No ECCS slave relays can actuate on Train B**

Answer 33

IF PT-457 selected for control (457/456): →Spray control lost in Auto →PCV-455A not available in Auto →Auto operation of PCV-456A blocked, independent of switch position, by PT-457 interlock @2185 psig →if Level Control is selected to 459/460 and Pressure Control is selected to 457/456, then ALL heaters energize

Answer 34

→if 455/458 selected, PCV-456A is unavailable in Auto →Auto operation of PCV-455A blocked, independent of switch position, by PT-458 interlock @2185 psig

Answer 35

→no steam dump actuation unless C-7 previously armed →no trip open capability on plant trip

Answer 36

→no steam dumps available due to loss of C-9

Answer 37

→C-16 stops turbine loading →C-16 cannot be bypassed on loss of uPC2

Answer 38

No Auto or Manual MU

Answer 39

No Auto operation of Boric Acid Transfer Pump 2

Answer 40

if turbine power >40%, AMSAC Protection lost

Answer 41

→u-HC-123 Excess Letdown HX Flow Control valve fails closed →u-HC-182 RCP Seal Water Pressure Control valve fails open

Answer 42

BTRS inoperable

Answer 43

prevents turbine runback on OTN-16 and OPN-16

Answer 44

→2592 closes, causing loss of forward flow →loss of MSR drain valves

Answer 45

→C-9 disabled on loss of uC3 →Steam Dumps are unavailable

Answer 46

FWIVs will close and FPBVs will open due to loss of Water Hammer Interlocks (will cause Rx Trip)

Answer 47

→will prevent normal operation of train related ARVs (1&3, 2&4) →will cause train related AFW FCV to fail open (M/A stations fail to RSP control; must go to M/A stations on RSP and press Auto to return control to MCB) →will cause train related EDG to have an 86-2 lockout signal and cause loss of power to EDG UV start relay; will trip if running →MFW FCVs fail open (SGs 1&2 for EC1, SGs 3&4 for EC2) → **Unit 2 Only:** FWIVs will close and FPBVs will open due to loss of Water Hammer Interlocks (will cause Rx Trip)

Answer 48

→u-HC-606 RHR HX 1 Flow Control Valve fails open →u-HC-128 RHR Letdown Flow Control valve fails closed

Answer 49

u-HC-607 RHR HX 2 Flow Control fails open

Answer 50

we lose TSLB lights on a loss of uPC4

Answer 51

SGBD isolates: →u-HV-2397 through 2400 SGBD Isolation Valves close →u-HV-2397A through 2400A HELB Isolation Valves close

Answer 52

→stopping major pieces of equipment is NOT a function of the sequencers →6.9 kV equipment tripped via UV relays for Blackout →some equipment is load shed but those are smaller loads

Answer 53

→SI Sequencer has priority over BO Sequencer →a "real" SI will override a "real" BO if they occur simultaneously or if the SI happens during BOS operation →BOS will be reset and the SIS OL and AL will be put in place →all loads will continue to run that were started by BOS, and the SIS will sequence equipment on

Answer 54

If a train's sequencer is being powered from uEC3 or uEC4 (a.k.a. "dirty power"), then the BO section of that sequencer is to be declared inoperable along with the associated EDG, i.e. the EDG will not start if an LOSP occurs. (BOS doesn't "see" the power loss, so it doesn't actuate when it comes back.)

Answer 55

→on SI, the EDG receives a start signal from the SIS AL →on Blackout, the BOS does not start the EDG; start signal comes from the UV relays if a slow transfer does not complete

Answer 56

Real modes will always override test modes.

Answer 57

1. SIS 2 of 4 2. BOS 3 of 4 3. SIS 1 of 4 (Test) 4. BOS 2 of 4 (Test) 5. SIS Test (Test pushbutton depressed) 6. BOS Test (Test pushbutton depressed)

Answer 58

→TDAFW Pump Steam Supply valves fail open due to OL →signal is train related; Loop 4 Train A, Loop 1 Train B

Answer 59

→self-resetting step timers will automatically reset 10 secs (90 secs total) after the sequencer completes step 10 →BOS PB is then enabled, allowing operator to reset the BOS →the rest of the step timers reset on a BOS reset, AL clear 5 secs after sequencer reset →Type 1 relays cleared automatically at 90 seconds

Answer 60

→OL automatically reset 30 secs (110 secs total) after completion of step 10 →identified by the fact that the Rx Makeup Water Pump restarts after OL clears

Answer 61

→requires exactly 2/4 coincidence →causes loads to be sequenced onto bus once voltage has returned → **OL and AL do not actuate in Test mode** →load sequencing can be blocked via "Block" switch on panel →block switch only allows sequence lights to light, no timers or relay lights →auto test reset toggle will cause sequencer not to fire because it does not remember a UV condition

Answer 62

→requires at least 3/4 coincidence →sends a redundant signal to stop the SIS on this UV condition →seals in the "Real" UV status (set the Remember 3/4 UV), turning on the UV 3/4 light →actuates the BOS Operator Lockouts →actuates the BOS Automatic Lockouts → **after 2 seconds, sends a signal defeating the Block Switch output** → **also after 2 seconds, enables the BOS to start, "fire", if the other conditions necessary to start the BOS are present (voltage restored)**

Answer 63

→Type 1 relays will clear 10 secs (99 secs total) after completion of step 10 →OL automatically reset 20 secs (109 secs total) after completion of step 10 →identified by the fact that the Rx Makeup Water Pump restarts after OL clears

Answer 64

SI inputs to sequencer will not be reset until SI has been manually reset by the operator since they are latching relays.

Answer 65

→Train A: uEC1 →Train B: uEC2 →if sequencers don't have power, they won't send out OL or AL signals →sequencers reset upon loss and restoration of power

Answer 66

OL and AL aren't actuated in Test Mode.

Answer 67

→Loss of All Normal Feedwater →Loss of Electrical Load without a Reactor Trip, Turbine Trip, and Initiation of Auxiliary Feedwater Flow Bases for FRS-0.1A (Response to Nuclear Power Generation/ATWT) specifically states that the turbine should be tripped within 30 seconds and AFW flow initiated within 60 seconds to ensure acceptable results.

Answer 68

→Turbine Trip, (minimizes SG level decrease) →TDAFWP starts →both MDAFWPs start, which causes the following: →SGBD lines and sample valves isolate →HV-2484/2485 CST Discharge to Hotwell valves close →split flow bypass valves close (Unit 2 ONLY)

Answer 69

Turbine load permissive (C-20) is used to block AMSAC with: →1/2 PT-505 or 506 <40% after 260 second (4:20) TDDO (will still respond for 260 secs after dropping below 40% pwr) →requires 2/2 >40% to enable AMSAC, no TD →C-20 window on PCIP is lit when AMSAC actuation is blocked

Answer 70

→actuation relays are safety related →each relay provided with test switch to allow actuating the individual relays for testing →only 3 of the 8 relays are used in Train A, and 3 of the 8 relays are used in Train B

Answer 71

TDPU for the SG Low Level Signal is set at 25 secs to allow sufficient time for the RPS to respond and initiate a Rx trip.

Answer 72

→3 of 4 SGs Level <10% on narrow range detectors (1/1) for ≥25 secs **and AMSAC is NOT blocked** →reset at 12.5% rising)

Answer 73

supplied from uC5, circuit 5

Answer 74

→No RCP Start in Modes 1 & 2 allowed →No inadvertent Dilution in Mode 6

Answer 75

→Below P-9, a Rx Trip from SSPS General Warning on both trains, a First-Out light will NOT illuminate →Above P-9, light WILL illuminate since >50% PWR Turbine Trip

Answer 76

→Bank withdrawal from subcritical →Uncontrolled Boron Dilution at Power →Stuck open safety (worse at high power) →Increase in MFW flow or decrease in MFW temperature (worse at high power) *Most events fall in this category.*

Answer 77

→Single RCCA withdrawal at power (due to hot channel factor) →Improperly loaded fuel assembly →Minor steam break

Answer 78

→RCCA Ejection (RPS terminates and Doppler mitigates) →Massive Steam Break (Bad for DNB and Cladding) →RCP Locked Rotor or Shaft Shear →Steam Generator Tube Rupture (SGTR) →Design Basis Fuel Handling Accidents *Events are not likely to happen.*

Answer 79

Any release shall be within the 10CFR100 Reactor Site Criteria guidelines. For an individual located at the... **Exclusion Area Boundary:** →would receive ≤25 rem whole body OR → ≤300 rem to the thyroid →in a 2 hr period **Low Population Zone Outer Boundary:** →would receive ≤25 rem whole body OR → ≤300 rem to the thyroid →for the duration of the release

Answer 80

**Origin:** →Manual - 1/2 CB hand switches →Hi-1 CNTM pressure (2/3) 3.2 psig →Low PZR pressure (2/4) 1820 psig (see P-11) →Low Steamline pressure (2/3) 605 psig on any 1 SG (rate sensitive; see P-11) **Reset:** →60 sec timer timed out for each train →P-4 signal present for each train →1 momentary pushbutton for each train **Notes:** →Ensures maintenance or recovery of Rx vessel water level →Boration to ensure adequate shutdown margin →SI cannot be reset until auto SI signal has cleared or been blocked. Blocking is done by the P-4 signal →Reset blocks all auto actuation signals for that train & unlatches the latching slave relays until P-4 signal is reset →Generates: Rx Trip, Turbine Trip, Phase “A”, FW Isolation signals, MDAFW Actuation, CNTMT Vent Isolation, CR Emergency Recirculation

Answer 81

**Origin:** →Safety Injection →Hi-Hi SG Level (see P-14) →Rx Trip w/ Low T-ave; P-4 with 2/4 loops @ 564°F (FW Isolation only, no turbine trip from this signal) **Reset:** →1 momentary pushbutton for each train for Rx Trip w/ Low T-ave reset →If generated by P-14, then P-14 must be clear and must cycle Rx trip breakers to reset signal →If generated by SI, then SI must be reset and must cycle Rx trip breakers to reset signal **Notes:** →Prevents overfilling SG →Prevents damage to Main Turbine from water in steam lines →Prevents excessive cooldown of RCS →Generates Turbine Trip, MFW Pump trip and FW Isolation. → **Reset signal overrides Rx Trip w/ low TAVG signal**

Answer 82

**Origin:** →Manual- 1/2 CB hand switches →Safety Injection **Reset:** →1 momentary pushbutton for each train **Notes:** →Isolates all non-essential lines into and out of CNTMT; **Does not isolate CCW to RCPs** →Reset signal overrides actuation signal as long as actuation signal is present

Answer 83

**Origin:** →Manual- 1/2 CB hand switches →Low Steam line pressure (2/3) 605 psig on any 1 SG (rate sensitive; see P-11) →HI-2 CNTMT pressure (2/3) 6.2 psig →Negative Steam line Pressure Rate (2/3) 100 psig/sec decreasing w/ 50 sec time constant (rate sensitive; see P-11) **Reset:** →1 momentary switch for each train →Actuation signal must not be present **Notes:** →Prevents continuous uncontrolled blowdown of more than 1 S/G therefore limiting RCS cooldown →Closes MSIVs and upstream (BEF) drip pot isolation valves →Limits mass and energy released into containment in the event of a steam line break inside containment →Once Negative rate in place, MSL Isolation will occur but not a Safety Injection since it is blocked

Answer 84

**Origin:** →uRE-5502 or uRE-5503 Hi Rad alarm (clears after 10 sec) →Safety Injection →Manual Phase “A” ½ CB hand switches →Manual CNTMT Spray Actuation 2/2 CB hand switches @ ½ MCB locations **Reset:** →1 momentary switch for each train **Notes:** →Shuts dampers, closes valves and stops fans associated w/ CNTMT ventilation →When CVI is reset due to RE input, then it will actuate again if SI input is received →Reset signal overrides actuation signal as long as actuation signal is present

Answer 85

**Origin:** →Manual on CV-03 →SI in either unit →Blackout Signal in either unit →XRE-5895A/B or XRE-5896A/B (Noble Gas Only) Hi Rad alarm **Reset:** →1 momentary switch for each train on CV-03 **Notes:** →Places Control Room in closed loop recirculation to limit operator exposure →Reset signal overrides actuation signal as long as actuation signal is present

Answer 86

**Origin:** →Manual on CV-03 coincident w/ CR Emergency Recirculation Signal **Reset:** →Manual hand switch on CV-03 **Notes:** →Aligns CR ventilation system to replenish oxygen supply while in emergency recirculation

Answer 87

**Origin:** →Manual on CV-03 **Reset:** →Manual hand switch on CV-03 **Notes:** →Totally isolates CR from all outside sources of air to prevent toxic gas or radioactivity from contaminating air while the system is in emergency recirculation

Answer 88

**Origin:** →Manual 2/2 CB hand switches @ 1/2 MCB locations. →Hi-3 CNTMT pressure (2/4) 18.2 psig **Reset:** →N/A **Notes:** →Initiates Containment Spray actuation signal and Phase “B” isolation signal →System designed such that 2/2 driver cards per train coincidence required to initiate Containment Spray. However, Phase “B” initiating requires only 1/1 driver card per train.

Answer 89

**Origin:** →“P” signal **Reset:** →1 momentary pushbutton for each train (CS reset pushbuttons) **Notes:** →Initiates Containment Spray →Reset signal overrides actuation signal as long as actuation signal is present

Answer 90

**Origin:** →“P” Signal **Reset:** →1 momentary pushbutton for each train (Phase “B” reset pushbuttons) **Notes:** →Isolates CCW Non-Safeguards Loop and RCP CCW isolation valves. →Reset signal overrides actuation signal as long as actuation signal is present

Answer 91

**Origin:** "BLAST" →B - Blackout* →L - Lo-Lo SG level (2/4) <38% U1, <35.4% U2 on any 1 SG (TDAFWP will also start with Lo-Lo on any 2 SGs) →A - AMSAC* →S - Safety Injection →T - Trip of both MFPs **Reset:** →N/A **Notes:** →Auto start of Aux FW Pumps also initiates isolation of SGBD, sample lines, Condenser Hotwell flowpath, and split flow bypass valve *Also starts TDAFWP

Answer 92

**Origin:** →C-20, AND →Narrow range level in 3 of 4 SGs <10% for 25 seconds, AND PT-505/506 >40% (TDDO 260 seconds) →Above conditions are sensed by 2/3 Actuation Logic Processors (ALPs) **Reset:** →N/A **Notes:** →Protects against loss of all FW flow w/out Rx/Turbine Trip or initiation of AFW flow →Initiates Turbine trip and AFW start →Closes SGBD valves, sample valves, split flow bypass valves & CST to Hotwell MOVs

Systems Exam 5 Full Comprehensive Deck for Review Flashcards

(118 cards)