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Systems > RHR > Flashcards

RHR Flashcards

1
Q

RH design basis:

Include one train, two trains, CC temperature

A

Both trains: reduces RCS temperature from 350F to 140F within 36 hours with 5000 GPM CC flow, and CC supply temperature of 105F.
First 3 hours of C/D, CC temperature allowed to increase to 120F.
One train: Reduces RCS temperature to <200F in 44 hours.
Operate for one year following LOCA (W/ single failure)

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2
Q

RHR pumps ratings/classification

A

Mechanical seals
3000 gpm rated/5000 gpm runout
Shutoff head 200 psid

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3
Q

RHR pump trips

A

Overcurrent, ground overcurrent and UV

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4
Q

Over pressure protection, 8701A/B and 8702A/B cannot open unless ______. hot leg suctions from ____ and ____ hot legs.

A

<337#

A; C

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5
Q

Over pressure protection for RHR system, 5 items

A 
<337# to open hot leg suctions
Two suction reliefs 450#
Two discharge reliefs 600#
Arm low temp
CV letdown line relief lift at 600#
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6
Q

RH minimum flow rate is_____ gpm. ____gpm is allowable for _____ hour per month.

A

500; 335; one

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7
Q

RH606 and 607 are the ______ valves and fail _____ on loss of instrument air.
RH618 and 619 are the _______ valves and fail _____ on loss of instrument air.

A

heat exchanger outlet valves and controls temperature; fails open
Heat exchanger bypass valves; fail closed

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8
Q

PT-____ and PT-____ feed the pressure interlock for the hot leg suction isolation valves. setpoint is _____.

A

403; 405; 337#

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9
Q

RHR pump seals are cooled by _____.

A

CC

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10
Q

RHR mini recirc auto opens when flow _____ and auto closes at ______.

A

<750 gpm

>1400 gpm

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11
Q

450 # suction relief valves relieve to the _____

A

HUT

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12
Q

450# suction reliefs are sized to relieve capacity of ______ at ______ and ______ at ______.

A

one cv pump, 350F

two cv pumps, 200F

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13
Q

RWST tech spec parameters

A

2300-2500 ppm
35-100F
>=89% level

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14
Q

Loss of either PT-403 or PT-405 will prevent _____ of a _____ on associated side.

A

opening; hot leg suction valve

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15
Q

Injection to recirc

first 6 steps

A

Verify sump isol open 2/4 46.7% RWST
Close RWST suctions 8812s
Close CV miniflows
Close SI miniflows
Close RHR crossties (8716A/B Isolates hot leg discharge path)
Open suction header cross tie valves (8807A/B, connnects CV and SI suction headers)

Open RH to CV and SI suction valves )SI8804A and B)

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16
Q

The _____ relief valves are sized to relieve maximum ______ in the RH system.

A

600# discharge header; RCS backleakage

17
Q

During Hot Leg Recirc, the RH Pumps take a suction from the ________ and discharge to the _________.

A

Containment Recirc Sumps

A & C Hot Legs
CV Pumps Suction
SI Pumps Suction

18
Q

During Cold Leg Injection, the RH Pumps take a suction from the ________ and discharge to the _________.

A

RWST

Cold legs

19
Q

During Cold Leg Recirculation, the RH Pumps take a suction from the ________ and discharge to the _________.

A

Containment Recirc Sumps

Cold Legs
CV Pumps Suction
SI Pumps Suction

20
Q

During Shutdown Cooling Operations, the RH Pumps take a suction from the ________ and discharge to the _________.

A

A and C hot legs

Cold legs

21
Q

During Reactor Cavity Fill, the RHR pumps take a suction from _____ and discharge to ______.

A

RWST

A and C hot legs

22
Q

To open the RWST suction valves, 8812a/b:

A

To open:
CV8804A (SI8804B) closed (piggy back valves)
Normal injection lineup
SI8811A(B) closed (containment sump suctions)
Prevents draining RWST to Containment Recirc Sump

23
Q

RH8701A/B RH8702A/B, to open

A 
To open:
SI8811A(B) closed (cont sump)
SI8812A(B) closed (RWST)
CV8804A (SI8804B) closed (piggy back)
RCS pressure <337# on PT403(B) (PT405(A))
RCS Temperature <350F
RH CB >min required for SDM
24
Q

RH8701B and RH8702A normally have power _____(available or removed)

25
Q

PT-403 goes with the ____ and 405 goes with the ____ for the RCS hot leg suction valves.

26
Q

SI 8811A/B are the containment sump isolation valves and will auto open______ with ______. To manually open, ____ and _____ and ______.

A

SI coincident with
Low-2 RWST level (2/4 <=46.7%)

SI8812A(B) closed
Prevents draining RWST to Containment Recirc Sump
RH8701A or B (RH8702A or B) closed
Prevents draining RCS to Containment Recirc Sump
CS001A(B) closed
Prevents draining RWST to Containment Recirc Sump

27
Q

SI8809A and B are normally _______ and _______. Both must be open in order for water to flow to _______.

A

Deenergized and open

all 4 cold legs

28
Q

SI8840, the a and c hot leg isolation valve is______ and is normally used________.

A

Deenergized closed

Opened for Hot Leg Recirc
Prevents Boron precipitation in the core
Terminates boiling in the core
Opened for Reactor Cavity Fill

29
Q

RH8735, rwst recirc valve

A

Manual valve-normally locked closed
Prevents recirculating RH injection water to the RWST during ECCS injection
Used for pumping out refueling cavity

30
Q

A RH Hx to CV Pump Suction Isolation Valve CV8804A

A

Normally closed
Opened during ECCS recirculation to provide suction source to CV and SI Pumps
To Open:
Either RH8701A or B closed
Prevents over pressurizing CV Pump suction
SI8811A open
Ensures suction source
SI8814 and SI8920 closed OR SI8813 closed
Prevents recirculating radioactive water to RWST

31
Q

B RH Hx to SI Pump Suction Isolation Valve SI8804B

A

Normally closed
Opened during ECCS recirculation to provide suction source to SI and CV Pumps
To Open:
Either RH8702A or B closed
SI8811B open
SI8814 and SI8920 closed OR SI8813 closed

32
Q

LCO 3.4.14 PIV leakage, pressure interlock requirements

A

Verify RHR System suction isolation valve
interlock prevents the valves from being
opened with a simulated or actual RCS
pressure signal >= 360 psig.

If not, then within 4 hours isolate the flowpath with one deenergized closed valve.

33
Q

CS-009A is interlocked with _______ and CS-009B is interlocked with _______. This prevents a flowpath between ______ and _______ through the CS system.

A

RH8701A; RH8702B; Containment sump; RCS

34
Q

During a system cooldown, when would RHR be placed in service?

A

<350F and <337 psig

35
Q

RCS pressure to open RH8701A/B and 8702A/B is _____ and tech spec number is ______.

A

337 psig

360 psig

36
Q

The RWST lo-2 interlock is enabled by ______.

37
Q

The purpose of CV128 is to _________ and ________ and _______.

A
  • Permit cleanup of RC when RH operating
  • Provides pressure control of RC when pzr is solid
  • Used for letdown of RC when pressure is too low
38
Q

SI 8811A/B sump suction isolation valves auto open when _____.

A

SI and RWST lo-2

Systems (80 decks)

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