RCS Flashcards by Unknown Unknown

When RCS > what temperature, is
a continuous MU bypass flow of
how many gpm to B HPI?

> 250F, flow of 3 gpm

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Be at least what delta k/k
shutdown if the most conservative
WR cold leg temp is less than
what?

1% delta k/k, <525F

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Do NOT open pzr spray valve
unless delta T between RCS and
pzr is less than or equal to what
temperature?

250F

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Maintain RCS dissolved gas <
what setpoint H2O to prevent
accumulation in CRDM?

<100 cc/kg H2O

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Pzr H/U and C/D rate?

100 F/HR

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Maintain min pzr spray bypass
flow of what gpm when RCS >
what temperature?

.75 gpm and RCS >200F

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When venting pzr to RCDT at low
pressure, avoid large pressure or
level transients by using what?

Small taps on RC-V-28 OPEN
pushbutton

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Tech specs
Leakage: basis is “leak before
break” strategy

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When Rx critical > what percent power,
how many RCS leak detection systems
of different operating principles shall be
in operation with X of X sensitive to
radioactivity. Systems may be OOS up
to how many hours provided RB atm
samples how many hours?

> 2%
2 RC leak detection systems
1 of 2 sensitive to radioactivity
OOS up to 72 hours
RB atm sampled 8 hours

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Normal Makeup flow path

RC-P-1B discharge via B HPI/MU-
V-17

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Letdown flow path

RC-P-1C suction line via MU-V-
1A/B

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Pressurizer Surge line

A Hot Leg

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Pressurizer spray line

RC-P-1A discharge via RC-V-1/3

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Drop Line

B hot leg via DH-V-1/2/3

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HPI

RCP discharge lines via MU-V-
16A/B/C/D

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LPI

CF Nozzles via DH-V-4A/B

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Once through steam generators (RC-
H-1A/B)
EFW nozzles: how many nozzles per
OTSG, sprays where to promote what
and reduce thermal stress on what?

7 nozzles per OTSG, sprays on
tubes to promote natural circulation,
reduce thermal stresses on the
lower tube sheet

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Tube to shell DT: tensile and
compressive temperatures

-70F (tensile) or +60F
(compressive)

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RCDT (WDL-T-3): Auto signals does
what?

IC-V-20 opens w/ WDL-P-8 starts
(110F, trips @ 105F if IC-V-4 is
OPEN).

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RCDT relief valve set point

40 psig

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RCDT rupture disc setpoint

55 psig

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OTSG milestones High to Low (just
percentages)

97.5% HSPS FW isolation (2/4)
90% ICS HLL (auto control)
88% HI OTSG level alarms
75-85% Loss of 25F SCM
50% Loss of 4 RCPs HSPS Auto
contro

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OTSG milestones High to low (just inches
of vacuum)

25” S/U LLLs (AUTO), HSPS EFW
control (Auto)
- Loss of both FWPs, 10” OTSG,
4#RB
20” S/U OTSG low level alarm
10” S/U HSPS low OTSG lvl EFW
AUTO start

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Pressurizer RC-T-2 capacity

12 gal/inch

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Pressurizer RC-T-2 Heaters, how many groups and how many heaters in each of how many banks?

13 groups, 9 heaters in 5 banks

Pressurizer Heater Banks, which ones and how are they controlled?

Banks 1,2,3 are SCR Controlled (variable heat demand) Banks 4 and 5 are bistable Controlled (on/off)

Pressurizer heater control table, setpoints

Find table

Where does MU come in?

MU from downstream RCP B between pump and RX

Where does HPI come in?

Between all RCP and RX

Where is let down go?

Suction side of RCP C

Pressurizer Power Supply:

1E and 1F 480V switchgear, 1A and 1B PZR Heater MCC’s

Pressurizer emergency power

Group 8 or Group 9, 1P or 1S 480V switchgear

Pressurizer interlocks All heaters De-energize at what pressurizer level (what level does it uncover) EXCEPT when powered from where?

80” pressurizer level (63.5” uncovered) EXCEPT when powered from 1P/1S ES switchgear

Can’t energize heaters < what pzr level (interlock bypass key where?) ON a loss of what you would need to defeat the interlock that actuates.

<80” (interlock bypass key in ICS/NNI cabinet) ON a loss of ICS AUTO power, interlock actuates and you need to defeat this

Which pzr groups trips on Es?

Groups 8 and 9

Which group has 69 bypass on 1s 480v to prevent tripped on ES when in emergency?

Group 9

Pzr level control Nominal level ensures pzr does not what post trip to prevent what?

Ensures pzr does NOT empty post trip to prevent loss of SCM

Pzr tech specs Pzr HU and CD rates shall NOT exceed what F/hr?

100F/HR

RX shall be maintained subcritical >what percent deltaK/k until pzr level what to what inches or else be in HSD w/ CRD breakers Open in how many hours and CSD in how many hours?

>1% deltak/k until pzr level 80-385” or else Be in HSD w/ CRD breakers OPEN in 6 hours and CSD in 30 hours

Pressurizer spray power supply

1A ES MCC

Pressurizer spray Auto signals:

Close at 2155#, OPEN at 2205# RCS to 40%@ 140 gpm

Manual Control: RC-v-1 can be OPENED in JOG up to 100% (190 gpm). Must place switch back to what position, will only close at what pressure in auto?

Auto 2155# in Auto

Where is HPI come in at?

RCP discharge side on all legs

RCITS

HOT leg level: RCPs off Reactor vessel level: RCPs off % void fraction: RCP’s operating RCS Drain Down Level: RCS drained down

MU-V-17 normal makeup

220” by the MU system using normal MU valve, MU-V-17 in automatic and letdown flow

Dry OTSG

<200 psig below saturation pressure And less than 6”

If you have a void in the hotleg can you have natural circulation?

No you can’t establish natural circ with a void in the hot leg

Can’t start a 4th RCP unless you’re above what temperature

407 F

Why do we need to compensate pzr level temperature?

It’s a differential pressure detector

How many pressure detectors in A hot leg? What pressure bands and used for what?

5, two narrow ranges/rosemound detectors: 1700-2500 psig For RPS, PORV, heaters and spray 2 wide ranges/bourdon tubes 0-2500 psig For ESAS, PORV, DH interlocks One wide range rosemount detector Safety grade (post accident) 0-3000 psig Used for Tsat memters, DSS trip

What type of flow tube in each hot leg? Connected to how many differential pressure instruments?

Gentile flow tube Connected to 4 differential pressure instruments

Pressurizer spray Purpose, if spray fails OPEN, plant may remain online by doing what?

Condenses steam to reduce pressure, RC-P-1A discharge normal source. Kept online by closes RC-V-3 (block valve) which is the pressurizer spray isolation valve

Power supply to spray isolation valve (RC-V-3)

1B ES MCC

Pressurizer spray isolation valve (Rc-v-3) Purpose

Isolations (full open/close) if rc-v-1 fails but eliminates bypass flow

Pressurizer spray isolation bypass (rc-v-24) Purpose

Maintains .75-1.5 gpm flow around spray valve RC-V-1 to prevent thermal shock to the spray valve and nozzle and continuous outflow from pzr to equalize boron concentration “mixing” (within 50 ppm)

Pressurizer Aux Spray (RC-V-4) Type of valve, power supply, purpose

MOV 1C ES valves MCC Provides pzr spray at low pressures during cooldown from discharge of decay heat pumps

High Pressure relief PORV (RC-RV-2) Type of valve? Power supply?

MOV/SOV 1C 250V DC

PORV Auto signals

OPEN at RCS #2450, CLOSE at RCS #2400

PORV Tech specs LTOP porv pressure when RCS is less than what temperature? How long to restore or verify pzr level is less than or equal to what?

<313F is 592# Restore in 8 hours or verify pzr level ≤100”

If LTOP not in effect, PORV min setpoint is what pressure? Restore in how much time OR shut what OR shut and remove power from PORV OR be in what in how much time and CSD in how much time?

PORV min setpoint is #2425 Restore in 8 hours OR Close block valve OR Close and remove power form PORV OR Be in hotstandby in 6 hours and CSD in 30 hours

When RCS is less than what temp, PORV shall NOT be taken OOS or isolated unless HPI pumps racked OUT, MUV-what Closed w/ bkrs to what position and MU-V-what Closed/open or RX head off.

<313F MUV-16’s Breakers open (MUV-16) MUV 217 closed

PORV clock valve shall be OPERABLE during hsby, s/u and power ops. If INOPERABLE, restore in how much time or close what and remove power OR be in hsby in how much time and CSD in how much time?

Restore in 1 hour OR Close PORV (verify closed) And Remove power OR Be in hsby in 6 hours or CSD in 30 hours.

PORV tech spec Design basis

Prevents overpressure by eliminating high pressure sources or assuring RCS open to atm. Block valve required to provide isolation of PORV to control potential RCS depressurization

PORV NDTT Switch Two position switch located on PC which changes PORV setpoint for LTOP concerns when RCS is less than what temp? in off setpoint is what? In auto position the OPEN setpoint to what pressure and Close at what pressure when Tcold is < what?

RCS <313F In OFF setpoint is #2450 In Auto open is #592 and close at #542 when Tcold <313F

PORV Other NDTT switch kept OFF because a single failure of WR Tcold instrument LOW would cause the PORV to OPEN. Per 1101-11, we place NDTT switch to what position after RCS< what temp and prior to RCS < what temp?

Place NDTT switch in Auto after RCS<565F and prior to RCS <313F

PORV isolation valve (RC-V-2) Type of valve and Power supply

MOV, a D-ring top of pzr 1C ES valves MCC

Most important pzr level mile stone

370” Enter AOP-43 loss of pressurizer and trip RX

Porv acoustic monitors (2 channels) Located on valve body, indicates if PORV is OPEN, alarm annunciator at how many G’s (%)

0.3G’s (5%)

Tail pipe (delta P)(3 channels) 1 for PORV, 2 for code safeties Indication on CC, how many inches delat p alarm setpoint (%)

20” delta P alarm setpoint (5%)

Tail Pipe delta P (3 channels) T.S. 3.5.5 accident monitoring requires how many channels, how many minimum?

2 channels with 1 minimum