RCP Flashcards by Unknown Unknown

Emergency core cooling systems
Maintenance or testing
how long if system is not restored within 72
hours

If the system is not restored to meet the
requirements of spec 3.3.1 within 72 hours, the
reactor shall be placed in a HOT SHUTDOWN
condition within 6 hours.

How well did you know this?

Not at all

Perfectly

ES actuation
Mu-v-2a/b
Take suction from BWST
Normal makeup get isolated
Muv 18, 36, 37 go closed
16 abcd go open
25 and 26 open

How well did you know this?

Not at all

Perfectly

RCP’s

How well did you know this?

Not at all

Perfectly

Limits and precautions
To reduce breakaway torque and magnitude
of starting current, do NOT do secure what
until RC pump is operating at what speed?

Do not secure high pressure oil lift pumps until RC
pump is operating at full speed

How well did you know this?

Not at all

Perfectly

Limits and precautions
To avoid insulation breakdown, Limit pump
motor starts to how many from what
temperature, allowing the motor to coast to
rest between starts, or how many starts if at
operating temp. after those how many mins
running or how many mins w/ motor stopped
must elapse

Limit pump motor starts to 3 from ambient temp
allowing the motor to coast to rest between starts
OR
2 starts if at operating temp
Thereafter 20 mins running or 40 mins w/ motor
stopped must elapse.

How well did you know this?

Not at all

Perfectly

Back stop pumps should be started prior to
what, and what pumps started immediately
following what?
Why do we verify auto start or start pump?

Backstop pumps should be started prior to RCP
S/D + lift pumps started immediately following
RCP trip/shutdown.
Verify auto start or start pump to avoid bearing
damage

How well did you know this?

Not at all

Perfectly

Establish seal injection prior to opening
what?

CBO (maintain SI flow at all time w/ CBO for
preventing debris

How well did you know this?

Not at all

Perfectly

Seal injection flow required to all RCP’s when
temp >what? And pressure >what? In loss of
SI mode?

SI flow required to all RCP’s when temp >190F
and pressure >100# in loss of SI mode

How well did you know this?

Not at all

Perfectly

Tech Specs
3.1.1.1 reactor coolant pumps:
Power operating with how many idle RCP in
EACH loop shall be restricted to how many
hours? If not restored, RX shall be in what
within how many hours? (power<what
percentage?)

Power operation with 1 idle RCP in eACh leap
shall be restricted to 24 hours. If not restored, Rx
shall be in HSD within 12 hours. (power <49%)

How well did you know this?

Not at all

Perfectly

Reactor coolant pump (RC-P-1A/B/C/D)
Power supplies

1A/1C -> A 6900 V
1B/1D -> B 6900 V

How well did you know this?

Not at all

Perfectly

What is the prime mover for the RCP?

Impeller

How well did you know this?

Not at all

Perfectly

RC sub component
Thermal barrier
If SI is lost, ICCW (~40 gpm) via thermal
barrier cools what?

RC leaking to area

How well did you know this?

Not at all

Perfectly

RCP sub component
Labyrinth seal
Purpose

Limits flow of seal water into primary to 5 gpm and
restricts RCS flow to RCP if seal injection is lost

How well did you know this?

Not at all

Perfectly

Rcp sub component
Flywheel
Purpose and how many each RCP has and
why?

Adds significant mass to RCP motor to increase
coastdown time. RC-P-1A/B/D have two , RC-P-
1C has one. Ensures adequate flow (coast down)
folowoing loss of all 4 RCPs for protection form
DNB

How well did you know this?

Not at all

Perfectly

Does RC-P-1C have a backstop oil pump and
why?

NO, it has a different clutch assembly

How well did you know this?

Not at all

Perfectly

High pressure Oil life system:
Purpose and why

Forces oil between thrust bearing rubbing
surfaces to reduce breakaway torque. This
prevents motor overload and damage to bearing
babbitt surfaces.

How well did you know this?

Not at all

Perfectly

High pressure oil life system
Power supplies

A/C -> 1A ES MCC
B/D -> 1B ES MCC

How well did you know this?

Not at all

Perfectly

High pressure oil lift system:
Operation when its started and stopped

Started before starting RCP
Stopped AFTER RCP is running

How well did you know this?

Not at all

Perfectly

High pressure oil lift system:
Auto start:
27/86 lockout

Auto starts: starts on RCP bkr trip
27/86 lockout: RC-P-2A/C-1 -> on A ES, RC-P-
2B/D-1 on B ES

How well did you know this?

Not at all

Perfectly

Reactor coolant pump startup requirements
Purpose and RCS temp to start 4th RCP

RCP startup req’s for normal ops are minimum
RCS pressures and temps to ensure NPSH and
verification that supporting a systems are lined up
and startup interlocks are met.
RCS must be >407F to start 4th RCP

How well did you know this?

Not at all

Perfectly

Reactor coolant pump startup requirements
(score)

Seals -> SI >22gpm AND Thermal Barrier Cooling
>550gpm
Cooling ->NS Pumps 52 Bkr Contacts
Oil -> Upper Bearing (>-1”), Lower Bearing (>-2” or >0
for RC-P-1C), Backstop Flow (>0.4gpm), Lift Pressure
(>1000# or >610# for RC-P-1C)
Reactor ->Less than 30% Power (prevents cold
water/positive react.)
Electrical -> Motor Starting UV <6.62kV

How well did you know this?

Not at all

Perfectly

Reactor Coolant Pump AUTO Trips:
(soups)

Short Circuit > 7478 amps
Overcurrent > 1273 amps
Undervoltage <6.15kv for 5.18 sec
Phase Differential of 5 Amps between phases
Seal Injection (<22 gpm) AND ICCW <550 gpm for
10 seconds

How well did you know this?

Not at all

Perfectly

Conditions Requiring RCP Trip
What level loss of SI and ICCW

Total loss

How well did you know this?

Not at all

Perfectly

Conditions Requiring RCP Trip
Loss of what cooling flow?

Loss of NS cooling flow

How well did you know this?

Not at all

Perfectly

Conditions Requiring RCP Trip Pump radial bearing temp >what temp?

>225F

Conditions Requiring RCP Trip Time critical action one and what do you have to do?

Loss of 25 SCM IAW EOP-010 Rule 1 -> time critical action within 1 minute. Verify SCM meter during initial rx trip b/c temp transmitter is slow to respond but pressure drops INSTANTLY

Conditions Requiring RCP Trip CBO > what temp?

>260F

Conditions Requiring RCP Trip Failure/serious degradation of how many seals w/ differential pressure of what on any seal?

2 seals w/ 1700 psid on any seal

Conditions Requiring RCP Trip Pump vibes > how many mils w/ how many pumps or how many mils w/ single pumps

Pump vibes >20 mils w/ 4 pumps OR 30 mils w/ single pumps

Motor vibes > how many mils

Motor vibes >4 mils

Conditions Requiring RCP Trip Motor thrust bearing temps >what temp Motor winding temp > what temp Motor bearing uppor lower guide temps >what temp?

Motor bearing upper or lower guide temps >185F (195F for C) Motor thrust bearing temp >200F (195F for C) Motor winding temp >302F (150C)

Flowserve N-9000 shaft seals: Differential pressure withstand?

Each stage can withstand full system pressure. Even pressure distribution is an indication of seal health

Flowserve N-9000 shaft seals: Monitoring parameters (3)

1.) Seal delta P: stage delta P is the critical parameter to determine seal failure. Hi- 2 PPC deltaP alarm is 1700 psid which requires manual pump shutdown 2.) CBO temp: if CBO temp>260F, then place the RCP in standby 3.) CBO Flow: 1.0 gpm low flow cut out during SD/HU when RCS

Extended loss of AC power (ELAP) Seals limit RCS losses with loss of all seal cooling New seals provide margin to allow for flex RCS inventory Flex strategy provides for closures of MU-V-33A-D to stop CBO flow

Extended Loss of AC POWER (ELAP) After six hours, CBO will be isolated and rCS temp will be reduced at 30F/hr

IN the event of an extended loss of aC power (ELAP), RCS water temp at the rcp will be maintained at less than 560F for less than 6 hours with CBO un-isolated.

Cavity Venting Purpose

To ensure adequate gas pressure in the RCP cavity to allow draining the cold legs without reducing RCS water level below the RCP spillover elevation (siphoning effect).

What temperature does the motor overload (amber) light come in at?

780 amps

Nuke services RCP cooling: Names of the coolers and their gpm (5)

1.)Lower oil cooler 8 gpm 2.)#1 upper oil cooler 60gpm 3.)#2 upper oil cooler 60 gpm 4.)Motor air cooler 80 gpm 5.)RC-P-1C upper cooler (one) 152 gpm

Pressure after radial bearing in RC pump?

~2145

Pressure after seal 1

~1430

Pressure after seal 2?

~715

No 3 leak off flow?

.05 gpm

CBO flow?

~2.4 gpm

RCP system operation: Loss of DC

High side 7kv feeder bkrs -> E DC (A DC) low side 7kv motor bkrs -> F DC (B DC) If you lose E dc, must trip RC pumps w/ control switch, if you lose F DC, must trip 7kv feeder buses (panel right)

RCP system operation: Loss of seal cooling (time associated)

No challenge to RCP seal integrity for at least 30 mins after loss of sealing cooling

Seal function Leakage is < what flow with all seals intact and CBO open?

<2.5 gpm

How much is CBO flow total with how much differential pressure evenly across the seals?

2.5 gpm with 710 psid evenly across the seals

How much seal leakage past #3 seal to RCDT?

.05 gpm

On 2 seal failures, either 1 partial and 1 full or 2 full failures (3)

1.) Dp on one seal will exceed 1700# HI-2 alarm 2.) Requires RCP manual S/D IAW procedure 3.) Should actuate a high CBO flow alarm >3.5 gpm

Abeyance seal What steam flow equivalent will cause this seal to actuate to the closed position to terminate leakage flow?

Steam flow equivalent to 4 gpm of liquid water (or an estimated low temp liquid flow of 30 gpm)

Back stop (anti rotation) device What does RCP-1A/B/D use to prevent reverse rotation?

Marland clutch

Back stop (anti-rotation) device What does RC-P-1C use to prevent rotation?

Ratchet and pawl assembly (doesn’t require oil flow to function, allowed removal of backstop oil pumps)

High pressure lift system Purpose

Forces oil between the thrust bearing rubbing surfaces to reduce breakaway torque

RC-P-2A/B/C/D (AC) auto starts when? Power supply 27/86 condition?

When RCP bkr opens/trips A/C 1A ES MCC, B/D 1B ES MCC 27/86 LO ES with UV

RC-P-2A/B/C/D (DC) When does it auto start? Power supply

Low oil pressure 1000# and RCP bkr opens/trips (both) A/C powered from 1C DC, B/D from 1D DC

Back stop oil pumps (RC-P-3A/B/D) (C doesn’t have) Power supply

3A/B/D1 powered from 1A RX plant MCC 3A/B/D2 from 1B Rx plant MCC

RCP pump/motor vibe setpoints Alert and danger for both

Pump: 15 mils alert, 20 mils danger Motor: 3 mils alert, 7 mils danger

RCP amps you should know Normal amps Locked rotor On motor overload amber light

Normal 678 (C 693) Locked rotor 3800 (C 4000) On motor overload amber light 780 amps

Do NOT start RCP unless RCS pressure is what band and cooling flow through the RCP bearings is what gpm?

To ensure a minimum cooling flow through the RCP bearings of 0.8 GPM, do not start the RCP unless RCS pressure is 220-225 psig.

Interlocks will only start a lift oil pump on RCP breaker trip/open. It is necessary to start a what and a what as an RCP is secured.

Necessary to start a backstop (except C) and a lift oil pump as an RCP is secured

Power operation with one idle RCP in each loop shall be restricted to how long? If the reactor is not returned to an acceptable RC pump operating combination at the end of the time period, the reactor shall be in what condition in the next how long?

24 hours 24 hours, then the reactor shall be in hot shutdown condition within the next 12 hours

Each safety related snubber shall be operable. Whenever the system protected by the snubber is required to be OPERABLE with one or more subbers inoperable, within 72 hours replace or restores the inoperable snubbers to OPERABLE status and perform engineering evaluation OR what do you have to do ?

DECLARE THE ATTACHED SYSTEM INOPERABLE AND FOLLOW THE APPROPRIATE ACTION STATEMENT FOR THAT SYSTEM.

Core Flood

Core flood Purpose

Floods core when RCS pressure drops below 600#

Level/Boron Makeup Temperature Normal band CF tank metal temperature low alarm?

Normal band >70 degF but <140 F CF tank metal temp low alarm: 75 F

Limits and precautions OP-TM-213-000 CF level indication will be erroneously high with the tank depressurized. Level indication is approximately how many inches above actual when CFT pressure is what?

7” above actual when CFT pressure is 0

Limits and precautions OP-TM-213-000 To avoid an invalid reading, do not allow CF-Tank level to exceed how many ft? exceeding that limit will result in filling the CF tank what with water?

Exceeding 14ft Filling the CF tank reference leg with water

During startup, the core flood tank isolation valves must be in what position? When the reactor coolant system pressure rises to what pressure? But is less than what pressure?

Core flood tank isolation valves must be OPENED when reactor coolant system pressure rises to 650 psig, but is less than 700 psig.

During normal reactor plant cooldown, what position do core flood tank isolation valves go to when reactor coolant pressure drops to less than what pressure but greater than what pressure?

Core flood tank isolation valves CLOSED