Sro Eccs Wk3

Front 1

A LOCA outside containment occurred. RWST level is decreasing as ECCS pumps inject into the RCS. Containment recirculation sump level is not increasing.What (if any) interlock prevents RHR pumps from taking suction from dry containment sumps? A. There is no interlock to prevent this.B. Low containment recirculation sump level prevents swapover.C. Low containment recirculation sump level trips RHR pumps.D. Low containment recirculation sump level blocks RWST suction valve closure.

Back 1

A

Front 2

The plant is in Mode 1, at 50% power. The Auxiliary Building Watch discovers the Residual Heat Removal Pump "B" discharge manual isolation valve (EJ-8724B) is closed.What effect does this have on the Emergency Core Cooling System (ECCS)? A. It makes the ECCS Train "B" inoperable.B. It leaves RHR Train "B" operable with no effect.C. It make the RHR Train "A" inoperable.D. It reduces flow to the CVCS letdown line.

Back 2

A

Front 3

A PZR vapor space LOCA has caused SI to actuate. Core Exit TCs stabilize at 5500F. RCS pressure stabilizes at 1400 psig. PZR level is 20% and increasing. SI cold leg injection flow is 400 gpm. (Assume RCS temperature remains constant)With no operator action, how will PZR level, RCS pressure, and ECCS flow respond? A. PZR level will stabilize, RCS pressure will increase, and ECCS flow will decrease.B. PZR level will stabilize, RCS pressure will decrease, and ECCS flow will increase.C. PZR level will increase, RCS pressure and ECCS flow will remain constant.D. PZR level will increase, RCS pressure will increase, and ECCS flow will decrease.

Back 3

D

Front 4

The RCS temperature is 3400F with Cold Overpressure armed. The cooldown rate has been constant at 500F per hour for the last two hours.Which ECCS pumps, if any, MUST have already been DNO'd? A. One CCP.B. None are required to be DNO'd by this point in time.C. One CCP and both SI Pumps.D. One CCP and one SI Pump.

Back 4

B

Front 5

An RCS cooldown was stopped at 3400F and temperature has been held constant for five hours.Which ECCS pumps MUST be DNO'd? A. One CCP and both SI pumps.B. One CCP.C. One CCP and one SI pump.D. None are required to be DNO'd by this time.

Back 5

A

Front 6

A PZR vapor space LOCA caused SI to actuate. Core exit TC temperatures are stable at 5500F and RCS pressure is stable at 1400 psig. PZR level is 20% and increasing rapidly. ECCS cold leg injection flow is stable at 400 gpm. (Assume RCS temperature remains constant.)With no operator action, how will the plant respond? A. PZR level stabilizes above 50%, RCS pressure decreases, and ECCS flow increases.B. PZR level increases until the PZR is solid, RCS pressure and ECCS flow remain constant.C. PZR level increases until the PZR is solid. RCS pressure increases and ECCS flow decreases.D. PZR level stabilizes above 50%, RCS pressure increases, and ECCS flow decreases.

Back 6

C

Front 7

A small break LOCA has occurred, and Control Room operators are preparing to conduct a Post LOCA cooldown by dumping steam to the condenser and RCS depressurization. The plant is stable with the following conditions: RCS Pressure 1200 psig RCS Tave 5000F PZR level 22% and slowly increasing Total ECCS flow 900 gpmHow would a 1000F/hr cooldown rate affect ECCS flow and RCS parameters? A. Flow decreases and PZR level decreases.B. Flow increases, no effect on RCS pressure.C. Flow increases and RCS pressure decreases.D. Flow decreases and RCS temperature decreases.

Back 7

C

Front 8

The unit is in Mode 4. A request is made to reduce RWST level to 91% for bladder maintenance. The following conditions exist:BAT level: A 21% B 65%Can RWST level be reduced to 91%? A. No, BATs are required to be greater than or equal to 17,658 gallons.B. Yes, RWST level will be above 394,000 gallons required by Tech Specs.C. No, RWST level would be insufficient to satisfy Tech Specs.D. Yes, only one boric acid flow path is required by Tech Specs.

Back 8

C

Front 9

Which is NOT an acceptance criteria for the ECCS? A. Calculated changes to core geometry shall be such that the core remains amenable to cooling.B. A secondary heat sink shall be maintained available to provide long term cooling.C. Total oxidation of the cladding shall not exceed 0.17 times the total cladding thickness before oxidation.D. The maximum fuel element cladding temperature shall not exceed 2200 0F.

Back 9

B

Front 10

The Safety Injection Accumulator Outlet Valves of the ECCS are required to be open with power removed in Modes 1,2, & 3, because they _________________________________. A. do not receive an open signal on a Safety Injection Signal.B. do not meet single failure criteria.C. receive an auto-close signal on lowering RCS pressure of 585 psig.D. do not receive an open signal on increasing RCS pressure to normal operating pressure.

Back 10

B

Front 11

The Emergency Core Cooling System (ECCS) uses angle valves and orifices in the flowpath. What is the purpose for these restrictions to the flow volume? A. Used to decrease the velocity of the flow for better core cooling.B. Used to add positive reactivity to the core following a Loss of Coolant Accident (LOCA).C. Used to adjust flow balance and provide back-pressure for CCPs to prevent pump run-out.D. Used to increase the velocity of the flow for better core cooling.

Back 11

C

Front 12

Which of the following describes the Intermediate Head injection pumps (SIP) point(s) of injection into the RCS upon actuation of a Safety Injection Signal (SIS) assuming pressure decreases rapidly? A. Hot Legs 3 and 4, onlyB. Cold Legs 1 and 4, onlyC. Hot Legs 1 and 2, onlyD. Cold Legs 1 through 4

Back 12

D

Front 13

Which of the following describes the point(s) of injection of the RHR System following the actuation of an SIS and subsequent depressurization of the RCS? A. RCS hot legs 1 through 4B. RCS cold legs 2 and 3 onlyC. RCS hot legs 2 and 3 onlyD. RCS cold legs 1 through 4

Back 13

D

Front 14

Which of the following conditions can cause the Centrifugal Charging Pump minimum flow bypass valves to close? A. Flow through the BIT of 173 gpm with SIS present.B. Flow through the BIT greater than 258 gpm with an SIS present.C. Normal charging flow at 150 gpm.D. Normal charging flow at 173 gpm.

Back 14

B

Front 15

A Mode or Phase of Emergency Core Cooling System (ECCS) operation during a Design Bases LOCA event is _________________________________________. A. Startup coolingB. Safety Injection Accumulator refillC. Cold leg recirculationD. Hot leg injection

Back 15

C

Front 16

The Safety Injection Pumps recirculate 45 gpm back to the RWST following an actuation of a Safety Injection Signal.What is the purpose of this flow? A. Provides a static head to the SI Accumulator fill piping and maintains the level in the tanks.B. Promotes homogeneous mixing of the RWST.C. Provides cooling for the integral oil cooler and mechanical seals.D. Provides pump protection when running against shutoff head.

Back 16

D

Front 17

The RCS pressure is stable at 1700 psig following a reactor trip and safety injection.Which of the following describes the effect on subcooling when the first Safety Injection Pump is secured? A. Subcooling will decrease because RCS pressure will drop below the shut-off head for the SI pump.B. Subcooling will decrease because SI flow will be reduced to the output from the remaining SI pump.C. Subcooling will remain constant because charging pump flow will increase to maintain RCS pressure.D. Subcooling will remain constant because pressure is above the shut-off head for the SI pump.

Back 17

D

Front 18

The unit is at 75%. Refueling Water Storage Tank parameters have been observed as follows:* Level 93%* Boron Concentration 2500 ppm* Water Temperature 96 ?F* 1% = 4012 gallonsWhat are the required Technical Specification actions? A. Restore the tank to OPERABLE status within 6 hours or be in at least HOT STANDBY within the next 6 hours due to Boron Concentration being out of specification.B. Restore the tank to OPERABLE status within 1 hour or be in at least HOT STANDBY within 6 hours due to Boron Concentration being out of specification.C. Restore the tank to OPERABLE status within 6 hours or be in at least HOT STANDBY within the next 6 hours due to low RWST level.D. Restore the tank to OPERABLE status within 1 hour or be in at least HOT STANDBY within 6 hours due to low RWST level.

Back 18

D

Front 19

On 5/1 the following conditions occur: - At 0400, performing SR 3.5.1.1, the "B" accumulator is declared inoperable. - At 1000, Accumulator "C" becomes inoperable because nitrogen gas pressure is too low.What are required TS Actions, including any extensions? A. Initiate a power reduction by 1100 and be in Mode 3 by 1700 on 5/1.B. Restore "B" accumulator to OPERABLE by 1000 on 5/2 or be in Mode 3 by 1600 on 5/2.C. Restore "B" accumulator to OPERABLE by 1400 on 5/2 and restore "C" accumulator to OPERABLE by 1000 on 5/2, or be in Mode 3 by 1600 on 5/2.D. Be in Mode 3 by 1600 on 5/1.

Back 19

A

Front 20

At 100% power "A" CCP Room Cooler is being DNO'd for some repairs.When is the "A" CCP declared inoperable? A. As soon as the Room Cooler is DNO'd.B. After room temperature exceeds 1490F.C. Within four hours.D. When room temperature exceeds 1190F.

Back 20

A

Front 21

What plant parameters are inputs to the Safety Injection Signal? A. Pressurizer Pressure, Pressurizer Level, RCS TemperatureB. RCS Pressure, Containment Pressure, RCS TemperatureC. RCS Pressure, Pressurizer Level, Steam Line PressureD. Pressurizer Pressure, Containment Pressure, Steam Line Pressure

Back 21

D

Front 22

Operators are conducting a plant cooldown for a refueling outage and have reached plant conditions required to block low PZR pressure Safety Injection (SI) signal.During startup of the plant following the outage, when does the automatic low PZR pressure SI signal unblock ? A. After 2 out of 3 PZR pressure channels are greater than P-11. B. After 3 of 4 PZR pressure channels are greater than 1830 psig.C. After reactor trip breakers are closed and S/G pressure is greater than 615 psig.D. After the RO manually unblocks the signal using SA-HS09 and SA-HS10 per the GEN procedure.

Back 22

A

Front 23

The unit is in Mode 1 at 100% RTP.On 5/1 at 1000, "B" ECCS accumulator is declared inoperable from low nitrogen pressure. A problem in charging the accumulator (discovered at 1100) caused the accumulator to be restored to OPERABLE at 1130 on 5/2.What power level is permitted by Technical Specifications for this condition? A. The unit was required to be in Mode 3 by 1700 with RCS pressure below 1000 psig by 2300 on 5/1.B. The unit may continue to operate in Mode 1, but initiation of a power reduction was required at 1000 on 5/2.C. The unit was required to be in Mode 4 by 2300 on 5/1.D. The unit may continue at 100% RTP. Although a shutdown ACTION was entered, NO requirement to initiate a power reduction at a certain time existed.

Back 23

D

Front 24

The following conditions are given:* The Unit is at 100% power.* An unisolable rupture of the Instrument Air header has occurred.* Assume no operator action; all controller in automatic.* CCP "A" supplying charging flow.Which conditions and associated reason will cause the reactor to trip following this total loss of instrument air? A. The letdown isolation valves will close and the pressurizer will fill up causing a pressurizer high level trip. B. The auxiliary spray will fail open causing a pressurizer low pressure trip.C. The pressurizer spray valves will fail open causing a pressurizer low pressure trip.D. The main feed regulating valves will close causing a steam generator low level trip.

Back 24

A

Front 25

The unit is at full power when the Auxiliary Building Operator finds the normal charging header discharge valves for both Centrifugal Charging Pumps unlocked and open.What is the potential result of this misalignment? A. Normal Charging header relief will lift on a Loss of Site Power.B. One CCP could have inadequate flow on a Safety Injection.C. VCT relief will lift on a Loss of Site Power.D. Boron Injection Tank flow will cause the mini-flow recirc valves to shut on a Safety Injection.

Back 25

B

Front 26

While at 100% power, the operator is restoring letdown following maintenance, with the following conditions present:* Pressurizer level channels LT-459 and LT-460 selected for control.* Letdown isolation valves BG LCV-459 and 460 are closed.* Letdown orifice isolation valves BG HV-8149 A/B/C closed.* Pressurizer level channels indicate as follows: BB LI-459 20% BB LI-460 18% BB LI-461 19%The Operator depresses the OPEN pushbutton for BG HV-8149A and it does not open, why? A. Interlock from channel LT-461 is preventing it from opening.B. Interlock from LCV-459 and 460 is preventing it from opening.C. Hydraulic lock between the letdown orifice isolation and the letdown isolation valves.D. No motive force to open the valve without upstream pressure.

Back 26

B

Front 27

The following plant conditions exist:* 80% power* A CCP running* Letdown @ 75gpm* NB0101, CCP 'A' breaker trips openAssuming no operator action, what automatic actuation will occur? A. NCP will automatically start.B. Letdown will isolate on high temperature.C. Letdown will isolate at 17% pressurizer level.D. Reactor trip on low pressure 1940 psig.

Back 27

C

Front 28

The plant is in Mode 1 at 100% power when Pressurizer level falls below 17%.Which of the following describes the proper system response? A. CVCS letdown isolation valves BG LCV-459 & 460 close, and letdown orifice isolation valves BG HV-8149A/B/C close.B. CVCS letdown containment isolation valves BG HV-8152 & 8160 close and letdown heat exchanger pressure control valve BG PCV-131 opens.C. CVCS letdown containment isolation valves BG HV-8152 & 8160 close and letdown orifice isolation valves BG HV-8149A/B/C closeD. CVCS letdown isolation valves BG LCV-459 & 460 close, and letdown heat exchanger pressure control valve BG PCV-131 opens.

Back 28

A

Front 29

What is the basis for maintaining at least 15 psig in the Volume Control Tank? A. To ensure adequate mixing with the H2 blanket to scavenge O2 in the RCS.B. To ensure the O2 concentration in the VCT does not exceed 5% by volume when hydrogen is present.C. To provide adequate NPSH requirements for the charging pumps.D. Provides a backpressure for the RCP #1 seals.

Back 29

D

Front 30

The crew is responding to a loss of NN01 Instrument Bus using OFN NN-021, LOSS OF VITAL 120 VAC INSTRUMENT BUS, and affected instruments have been selected out when the RO requests that charging be reduced to the seals only.Why is this request made? A. Prevent flashing in the letdown lineB. Mitigate RCS temperature dropC. Mitigate high RCP seal filter differential pressureD. Prevent reactor trip on high Pressurizer level

Back 30

B

Front 31

Pressurizer level is decreasing with 45 gpm letdown and 225 gpm (on NPIS) charging flow. Seal leakoff is 2.1 gpm per RCP.What is the RCS leakage and appropriate actions required? A. 180 gpm, start all available charging pumpsB. 172 gpm, trip the reactorC. 217 gpm, trip the reactor and actuate SID. 172 gpm, isolate letdown

Back 31

D

Front 32

1. Which of the following describes the ECCS Safety Injection subsystem? A. High head injection system. B. Intermediate head injection system. C. Low head injection system. D. Accumulator safety injection system.

Back 32

Answer: B.

Front 33

2. What describes the ECCS subsystem, Residual Heat Removal System? A. High head injection system. B. Intermediate head injection system. C. Low head injection system. D. Accumulator safety injection system.

Back 33

Answer: C.

Front 34

3. What is the function of the ECCS?

Back 34

Answer: Cool the core and add negative reactivity following a postulated accident.

Front 35

4. List the five ECCS subsystems.

Back 35

Answer: 1. High Head Injection System 2. Intermediate Head Injection System 3. Low Head Injection System 4. Accumulator Safety Injection System. 5. Refueling Water Storage Tank (RWST)

Front 36

1. Which one of the following is NOT an accident the ECCS is designed to mitigate? A. Rod ejection accident. B. Loss of secondary coolant accident. C. Steam generator tube rupture. D. Loss of all AC power to NB Busses.

Back 36

Answer: D.

Front 37

2. List four DBAs.

Back 37

Answer: 1. LOCA 2. Rod ejection accident 3. Loss of secondary coolant accident 4. SGTR

Front 38

3. State the five 10CFR50.46 ECCS acceptance criteria.

Back 38

Answer: 1. Peak Cladding Temperature - ? 2200¡F 2. Maximum Cladding Oxidation - ? 0.17 times total cladding thickness before oxidation. 3. Maximum Hydrogen Generation - ? 0.01 times amount generated if all metal in cladding reacted 4. Cool able Geometry 5. Long-Term Cooling

Front 39

1. Which one of the following is a function of the ECCS? The ECCS provides: A. Positive reactivity addition following a LOCA. B. Core cooling following a LOCA. C. Positive reactivity addition following a normal plant shutdown. D. Core cooling following a normal plant shutdown.

Back 39

Answer: B.

Front 40

2. Which one of the following groups of plant parameters are inputs to the Safety Injection Signal? A. RCS pressure, Containment pressure, and RCS temperature. B. RCS pressure, Pressurizer level, and steam line pressure. C. Pressurizer pressure, Pressurizer level, and RCS temperature. D. Pressurizer pressure, Containment pressure, and steam line pressure.

Back 40

Answer: D.

Front 41

3. State the function of the Accumulator Injection System.

Back 41

Answer: Limit fuel clad temperature following large break LOCA

Front 42

4. State the ECCS function of the RWST.

Back 42

Answer: Provide borated water during accident conditions

Front 43

1. How would a loss of instrument air affect the ECCS injection flow path during a Safety Injection Signal actuation condition?

Back 43

Answer: Loss of instrument air would have no affect on the injection flow path. However, loss of instrument air would prevent the pressurizing or normal venting the accumulators, and prevent temperature control of the RWST.

Front 44

2. How could the RWST be inoperable?

Back 44

Answer: Loss of inventory (rupture, use, etc.), unusable inventory (contamination), inability to align for SI (BN-V011 shut, pipe rupture, etc.), boron concentration too high or too low.

Front 45

3. During the Injection Phase of ECCS operation, the ECCS pumps take suction from the: A. Reactor Makeup Water Storage Tank. B. Essential Service Water header. C. Refueling Water Storage Tank. D. Boric Acid Storage Tanks.

Back 45

Answer: C. Refueling Water Storage Tank.

Front 46

4. Concerning the ECCS accumulators, which one of the following statements is true? A. The accumulator isolation valves fail "as is". B. An orifice is provided to extend the blow down time of the accumulators during a LOCA. C. The accumulator relief valves discharge to the Pressurizer Relief Tank. D. Accumulator check valves are not considered pressure boundary valves.

Back 46

Answer: A. The accumulator isolation valves fail "as is".

Front 47

1. While RCS pressure is above the RHR pumps shutoff head, post LOCA, the discharge flow is recirculated to the: A. Volume Control Tank. B. Containment normal sumps. C. Pump suction. D. Refueling Water Storage Tank.

Back 47

Answer: C. Pump suction.

Front 48

2. For the Low Pressure Safety Injection System, what is the design flow rate and shutoff head?

Back 48

Answer: 3800 gpm/pump at 350 ft (152 psi); Shutoff head 193 psig

Front 49

3. For the Intermediate Head Safety Injection System, what is the design flow rate and shutoff head?

Back 49

Answer: 440 gpm/pump at 2780 ft (1204 psi); Shutoff head 1578 psig

Front 50

4. For the High Head Safety Injection System, what is the design flow rate and shutoff head?

Back 50

Answer: 150 gpm/pump at 5800 ft (2511 psi); Shutoff head 2685 psig

Front 51

1. Identify the ECCS flow paths and valve positions during the: A. Injection Phase B. Cold Leg Recirculation Phase C. Hot Leg Recirculation Phase

Back 51

Answer: Using Figure 2 and the text, check your answers.

Front 52

2. Ten hours following a large break LOCA, ECCS Hot Leg Recirculation is placed into service. The purpose of Hot Leg Recirculation is to: A. Refill the Pressurizer. B. Provide cooling for the reactor vessel head. C. Flush out boron that may have precipitated on the fuel rods. D. Equalize the differential temperature across the reactor vessel.

Back 52

Answer: C.

Front 53

3. Where are the Safety Injection pumps taking suction from and discharging to when aligned in Hot Leg Recirculation Mode? A. Suction from the Containment sump and discharges to the RCS hot legs and to the suction of the CCPs. B. Suction from the discharge of the RHR pumps and discharges to the RCS cold legs. C. Suction from the discharge of the RHR pumps and discharges to the RCS hot legs. D. Suction from the Containment sump and discharges to the RCS hot legs.

Back 53

Answer: C.

Front 54

1. Which one of the following statements is true of the Emergency Core Cooling System during normal operation? The Safety Injection pumps are aligned to: A. Take suction from the RCS hot legs. B. Automatically inject into the RCS hot legs. C. The RWST through open isolation valves with their power removed. D. Take suction from the RWST and inject water into the RCS cold legs.

Back 54

Answer: D.

Front 55

2. How does the Essential Service Water system interface with low, intermediate, and high-pressure injection subsystems?

Back 55

Answer: Room cooling.

Front 56

3. Why does the RWST interface with the Containment Spray System?

Back 56

Answer: The RWST is the initial source of spray water.

Front 57

1. List the nine actions initiated by SIS actuation.

Back 57

Answer: 1. Emergency diesel generators start. 2. CCPs start. 3. RWST suction valves to the CCPs open. 4. BIT suction and discharge parallel isolation valves open. 5. Normal charging path valves close. 6. SIPs start. 7. RHR pumps start. 8. VCT outlet isolation valves close. 9. RWST discharge isolation valves to the SFP cooling and cleanup system close.

Front 58

2. Concerning the ECCS accumulators, which one of the following is correct? A. The accumulator isolation valves fail as is. B. An orifice is provided to extend the blow down time during a LOCA. C. Their relief valves discharge to the Pressurizer Relief Tank. D. Their check valves are not considered pressure boundary valves.

Back 58

Answer: A.

Front 59

3: What interlock condition must be met before the sump to RHR valves open following an SIS actuation?

Back 59

Answer: 2/4 RWST level transmitters indicate Lo Lo-1 (36%).

Front 60

1. Which one of the following statements regarding operation of the Emergency Core Cooling System following a LOCA is correct? A. CCPs supply reflood, followed immediately by the SI pumps, accumulators, then RHR pumps. B. Accumulators rapidly reflood the core, the CCPs and SI pumps continue injecting. C. Accumulators begin injecting when the RCS pressure drops to 800 psig. D. RHR pumps will begin injecting when RCS pressure drops to 400 psig.

Back 60

Answer: B.

Front 61

2. What is the source of water for ECCS pumps, during the Recirculation Phases, following a Loss of Coolant Accident? A. Refueling Water Storage Tank. B. Boric Acid Tank. C. Containment Recirculation Sump. D. Reactor Makeup Water Storage Tank.

Back 61

Answer: C.

Front 62

3. Into how many reactor coolant loops do the CCPs inject after an SIS is actuated?

Back 62

Answer: All four.

Front 63

4. Assuming normal alignment and operation, how many active components must actuate for intermediate head injection to meet its design requirements? List them.

Back 63

Answer: Just 1; one of two intermediate head pumps must start; the rest of the intermediate head injection system is pre-aligned.

Front 64

1. In general, what is the idea behind using parallel valves in the ECCS such as those at the BIT inlet and outlet isolation valves?

Back 64

Answer: Ensures an open flow path.

Front 65

2. In general, what is the idea behind using valves in series?

Back 65

Answer: Ensures a closed path.

Front 66

3. List indications of a Containment recirc sump blockage.

Back 66

Answer: Blockage can be diagnosed by: 1. Decreasing Containment recirc sump level for that sump. 2. That train of RHR will have decreasing flow (low flow alarm). 3. RHR motor amps will start to fluctuate as air binding or cavitation starts. 4. The sump level decrease will start to slow when the level allows a vortex to develop and air to be drawn into the pump. 5. The sump level will most likely stabilize at a low level where the leakage in equals the RHR pumping out.

Front 67

1. What minimum flow protection is provided to the intermediate head injection pumps during Cold Leg Recirculation? What about during Hot Leg Recirculation?

Back 67

Answer: None

Front 68

2. What minimum flow protection is provided to low head and high head injection pumps during the Injection Phase?

Back 68

Answer: Minimum flow valves which automatically open and close as needed.

Front 69

1. Describe how the ECCS system responds to a SIS.

Back 69

Answer: 1. High Head Injection: a. CCPs start. b. CCP suction from RWST open. c. When CCP suction from RWST are fully open, CCP suction from VCT shut. d. BIT inlet and outlet valves open. e. CCP to Regen HX isolation valves close. f. CCP mini-flow valves shift to auto control by BIT flow. 2. Intermediate Head Injection pumps start (SIPs). 3. Low Head Injection pumps start (RHR). 4. Accumulators automatically inject when RCS pressure decreases below accumulator pressure.

Front 70

2. EMG ES-12, Transfer to Cold Leg Recirculation, was successfully implemented ~4 hours ago. Now, the "B" RHR pump is experiencing oscillating motor amps, and the "B" Containment recirc sump level is decreasing. Why?

Back 70

Answer: "B" Containment recirc sump blockage.