RHR

Question 1

State Pressure Temp limits for placing RHR in service

Answer 1

350F/ 362#

250F for second train

Question 2

Describe RHR pump flow and pressure

Answer 2

Design: 3500 GPM @ 160#
Runout: 4500 GPM @ 120#
Shutoff: 200#

Question 3

State RH pump min flow valve set points (RH-FCV-610/611)

Answer 3

Auto open <750 GPM

Auto close >1403 GPM

Question 4

State interlocks on RC-V-22,23,87,88

Answer 4

RH-V-35/36 must be closed (prevents diverting flow from RCS)
AND
RCS pressure <362#

Question 5

State interlocks for CBS-V-2/5

Answer 5

To go open RH-V35/36 must be closed
And CBS-V-8/14 must be closed
Auto open on S-signal

Question 6

State open interlocks for RH-V-35/36

Answer 6

Either SI-V-93 or both SI-V-89 and 90 closed
CBS-V-8/14 open
At least 1 RCS hot leg suction closed (RC-V-22 or 23/RC-V-87 or 88)

Question 7

Discuss RH pump suction relief valves

Answer 7

Lifts at 450#

Each sized to pass 900 GPM from 1 CCP at 350F/365# or 2 CCPs operating with RCS <200F

Question 8

Discuss RH pump discharge relief valves

Answer 8

Lifts at 600#

Each sized to pass 20 GPM, based on max expected leakage from check valves

Question 9

Discuss RHR flow control valves (FCV-618,619)

Answer 9

maintains system flow @3500 GPM (adjusts bypass flow)

Question 10

Discuss RHR pumps response to SI

Answer 10

SI w/o EPS - Pump start

SI with LOP - RH pumps start at SR2

Question 11

State how to power RHR hot leg suction valve in an emergency

Answer 11

A temporary connection will be provided to the MCC compartment of the RC valves whose power supply has failed via dedicated cable from the unaffected redundant valve

Question 12

State Semi-auto swap over scheme for CBS-V-8/14

Answer 12

SI must be in
RWST LO level (120,478 Gallons) 2/4
RC-V-22 or 23/87 or 88 must be closed

Question 13

Describe RHR line up during Cold Leg Recirc

Answer 13

Recirculation sump suction valves (CBS-V-8/14) auto OPEN on RWST low-low level (120,478 gallons) Coincident with an SI signal
RWST isolation valves (CBS-V-2/5) must be manually CLOSED
RH-V-14 or RH-V-26 is closed
RH-V-35/36 manually OPENED to supply SI and CCP suctions
Why is RH-V14 or RH-V-26 closed?
To prevent RHR pump runout should one RHR pump fail.

Question 14

State T.S. 3.4.1.3 Reactor Coolant Loops and Coolant Circulation (HOT SHUTDOWN) LCO and Action

Answer 14

At least two of the loops list below shall be OPERABLE and at least one of these loos shall be in operation:
RCS Loops
RHR Loops
MODE: 4
a. With less that the above required loops OPERABLE, immediately initiate corrective action to return the required loops to OPERABLE status as soon as possible If the remaining OPERABLE loops is an RHR loop, be in COLD SHUTDOWN within 24 HRs
b. With no loop in operation, suspend all operations involving a reduction in boron concentration of the RCS and immediately initiate corrective action to return the required loops to operation

Question 15

State T.S. 3.4.1.4.1 Reactor Coolant Loops and Coolant Circulation (COLD SHUTDOWN - Loops Filled) LCO and Action

Answer 15

At least 1 RHR loops shall be OPERABLE and in operation and either
a. one additional RHR loop shall be OPERABLE or
B. Secondary side water of at least two steam generators shall be greater than 14%
MODE: 5 with RCS loops filled
a. with one of the RHR loops inoperable and with less that the required steam generator water level, immediately initiate corrective action to return the inoperable RHR loop to OPERABLE status or restore the required steam generator water level as soon as possible
b. With no RHR loop in operation, suspend all operations involving a reduction in boron concentration of the RCS and immediately initiate corrective action to return the required RHR loops to operation

Question 16

State T.S. 3.4.1.4.2 (Reactor Coolant Loops and Coolant Circulation, COLD SHUTDOWN - Loops not Filled) LCO and Action

Answer 16

TWO RHR loops shall be OPERABLE and at least one RHR loos shall be in operation
MODE: 5 with RCS loops not filled
a. with one of the RHR loops inoperable immediately initiate corrective action to return the inoperable RHR loop to OPERABLE status as soon as possible
b. With no RHR loop in operation, suspend all operations involving a reduction in boron concentration of the RCS and immediately initiate corrective action to return the required RHR loops to operation

Question 17

State T.S. 3.9.8.1 (RHR and COOLANT CIRCULATION - HIGH WATER LEVEL) LCO and ACTION

Answer 17

At least one RHR loop shall be OPERABLE and in operation
MODE: 6, when the water level above the top of the reactor vessel flange in greater than or equal to 23 feet.
With no RHR loop OPERABLE and in operation, suspend all operation involving an increase in the reactor decay heat load or a reduction in boron concentration or the RCS and immediately initiate corrective action to return the required RHR loops to OPERABLE and operating state as soon as possible.