ML17072A432

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Post Exam Comments and Technical References (Folder 1)
ML17072A432
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Issue date: 01/16/2017
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NRC Post Exam Comment Resolution 2017 Limerick NRC Initial License Exam RO Question #5 Facility Request Accept two correct answers (Key Answer C and also Choice B).

NRC Resolutions Accept Choices B and C as correct answers.

Reasoning The question asks applicants to select the choice that describes the bases for the power reduction directed in accordance with ON-119, "Loss of Instrument Air." Each of the two accepted choices describes one of the reasons for the power reduction. Therefore each is a correct answer to the question.

ON-119 Bases, "Loss of Instrument Air - Bases", Revision 28, explains, in part, that "reducing reactor power will reduce feedwater flow rate and provide the feed pump control system greater margin to maintain adequate feed to the reactor should feed pump or condensate pump minimum flow valves start to drift open on low instrument operating air pressure." This basis is described by Key Answer C, to "reduce the probability of inadequate feedwater should the condensate or feed pump min flow valves drift."

ON-119 Bases, "Loss of Instrument Air - Bases", Revision 28, explains, in part, that "g_

reactor scram. should it occur. would be a less severe transient when initiated at a lower power level." The next ON-119 procedure step after the one directing a power reduction has the operator monitor for rod drift as low air pressure could cause rod drift and, if low pressure occurs, the operator is directed to manually scram the reactor. This basis is described by Choice B, to "reduce the transient if a SCRAM is required due to rods drifting in."

2017 Limerick IL T NRC Exam Post-Exam Challenges Question #05 Given:

  • Instrument Air header pressure is lowering The CRS has directed a power reduction per ON-119, Loss Of Instrument Air Which of the following describes the bases for the power reduction?

A.

Reduce the probability of a turbine trip from lowering condenser vacuum.

B.

Reduce the transient if a SCRAM is required due to rods drifting in.

C.

Reduce the probability of inadequate feedwater should the condensate or feed pump min flow valves drift.

D.

Reduce the probability of power exceeding 100% should the feedwater heater dump valves fail open.

Answer:

C Immediately following this Discussion is the Answer Explanation for Question #05 as it appeared on the RO portion of the Approved Exam Key.

Discussion Of the ten (10) applicants, three (3) chose 'C', the correct answer, while the remaining seven (7) applicants chose distractor 'B'.

The procedure which the question is based upon, ON-119 Bases, "Loss of Instrument Air -

Bases", provides direction to lower reactor power in response to degrading instrument air system pressure.

Question 05 centers on the basis for this power reduction.

The ON-119 Bases states the following for the power reduction step, 2.3.1:

2.3.1 IF pressure remains less than 85 psig, THEN REDUCE reactor power to less than 44% in accordance with GP-5, Appendix 2, Section 3.1, Reducing Rx Power, AND Reactor Maneuvering Shutdown Instructions.

2017 Limerick IL T NRG Exam Post-Exam Challenges BASIS Reducing reactor power will reduce feedwater flow rate and provide the feed pump control system greater margin to maintain adequate feed to the reactor should feed pump or condensate pump minimum flow valves start to drift open on low instrument operating air pressure. Also, a reactor scram, should it occur, would be a less severe transient when initiated at a lower reactor power."

This basis is the supporting information for choice 'C' being correct in that a power reduction is performed to reduce the probability of inadequate feedwater should the condensate or feedwater min flow valves fail open due to a loss of air to the valve operators.

The last sentence in this basis (re-stated below) supports choice 'B' also being correct.

"Also, a reactor scram, should it occur, would be a less severe transient when initiated at a lower reactor power."

The stem of the question identifies that the CRS has directed a power reduction per ON-119.

From this information the applicants determine that both Instrument air headers remain less than 85 psig (ON-119 step 2.3.1) and procedural actions due to the transient need to continue to be executed. The subsequent steps in ON-119 (2.3.2 and 2.3.3) have the operator monitor for drifting control rods, and if control rod drifting is experienced to manually SCRAM the reactor, respectively.

"Should it occur implies any scram whether manually or automatically initiated.

Therefore, if a scram is manually initiated due to drifting control rods, as required by step 2.3.3, the resulting transient is less severe, due to the action to reduce power described in the stem of the question and discussed in the bases for step 2.3.1.

Therefore both Answers B and C are equally correct in that each answer provides a discreet part of the basis for how the impact to the plant is reduced with the action to reduce reactor power. Answers B and C each cover a portion of the basis for why a power reduction would be directed (as described in the stem of the question) but neither answer covers the entire bases nor does either answer form a subset of the other answer.

Distractors 'A' and 'D' remain incorrect. The question stem states the CRS has directed a power reduction per ON-119 then requests the basis for this power reduction, clearly asking the basis for the power reduction as described in ON-119. The basis for the power reduction makes no mention of an immediate need to address condenser vacuum or a feedwater heater transient. Therefore these two answers remain plausible but incorrect for the same reasons listed in the original answer explanation.

Applicant Comments:

Discussions with the applicants during post exam review revealed that their answers were based on their knowledge of what was contained in the basis for step 2.3.1.

Additionally, one applicant provided a comment at time 1125 on 1/27/17 (during written exam administration) the he believed that both 'B' and 'C' are correct based on ON-119 Bases.

2017 Limerick IL T NRC Exam Post-Exam Challenges Facility Recommendation Based on the determination that the bases for ON-119 step 2.3.1 fully supports both choices 'B' and 'C' as equally correct, the facility agrees with the applicants and recommends that both Answers 'B' and 'C' be taken as correct answers to this question.

References:

1. ON-119, Loss of Instrument Air - Bases, Revision 28.

5 2017 Limerick IL T NRC Exam Post-Exam Challenges ID: 1454611 Points: 1.00 Answer Explanation Both inst. air header low alarms coming in is an entry condition for ON-119.

The bases for reducing power to 44% is to reduce the probability of a loss of adequate feedwater should the Condensate or RFP Min Flow valve begin to drift open.

Low Instrument Air pressure could cause CRD HCU scram valves to drift open, resulting in the associated control rods to insert. This is the Bases for manually SCRAMING the reactor if control rods start to drift in Air ejector valves may fail due to loss of air causing vacuum to decrease, however ON-119 directs entry to OT-116 for loss of vacuum actions Feed water dump valves may fail open on a loss of air causing a power increase, however ON-119 directs operators to OT-104 for a loss of feedwater heating C is correct for the above reasons and the distractors are plausible to the examinee who does not recall the basis for reducing power to 44%

2017 Limerick IL T NRC Exam Post-Exam Challenges Question 5 Info Question Type:

Multiple Choice Status:

Active Always select on test?

No Authorized for practice?

No Points:

1.00 rnme to Complete:

s Difficultv:

~.00 System ID:

1454611 User-Defined ID:

P#5NEW Lesson Plan Objective:

LGSOPS1550.03

T"opic

actions for loss of air RO:

S.3 SRO:

S.4 KA#:

SOOOOO K3.02

2017 Limerick IL T NRC Exam Post-Exam Challenges Comments:

K3.02 300000 K3.02 3.3/3.4 Instrument Air System (IAS)

Knowledge of the effect that a loss or malfunction of the

. INSTRUMENT AIR SYSTEM) will have on the following: Systems having pneumatic valves and controls 41.7 ON-119 P&ID M-0015 sht 4

EXELON GENERATION LIMERICK GENERATING STATION ON-119 BASES, Rev. 28 Page 1of12 JHG:jhg ON-119 LOSS OF INSTRUMENT AIR - BASES cM-1 1.0 SYMPTOMS 1.1 Both Instrument Air Header low pressure alarms.

BASIS Both Instrument Air Header low pressure annunciators alarming (*18-B(C)-2) indicates that both the *A and *B Instrument Air Headers are less than the alarm setpoint of 85 psig. Air systems redundancy has failed to maintain at least one source of Instrument Air at normal pressure to critical plant valves and instrumentation. Consequently, plant stability is threatened.

1.2 Scram pilot air header low pressure alarm.

BASIS This alarm (*08-0-5) is indicative of a low Instrument Air header pressure. Pressure is sensed downstream of a pressure control valve which reduces normal Instrument Air pressure to 70 to 75 psig. This alarm annunciates at 65 psig.

2.0 OPERATOR ACTIONS 2.1 IF any of the following compressors are not running, THEN START them per S15.1.B:

  • A Instrument Air Compressor
  • B Instrument Air Compressor Service Air Compressor BASIS These compressors should be running and loaded (automatically) at receiver pressures less than 97 psig. A compressor not running may be a failure to auto start, and a manual start could restore Instrument Air pressure.

ON-119 BASES, Rev. 28 Page 2 of 12 JHG:jhg 2.2 MONITOR the following instrument air pressure indications:

Pl-15-*20A, "*A Instrument Air Header Pressure" (PX), at *OC655 Pl-15-*20B, "*B Instrument Air Header Pressure" (PX), at *OC655 BASIS Pressure indicators Pl-15-*20A(B) indicate instrument air pressure downstream of the instrument air dryers and are indicative of actual pressure on the instrument air header.

Computer point G500 (C*130), "*A Instrument Air Receiver Lower Pressure" Computer point G501 (C*131 ), "*B Instrument Air Receiver Low Pressure" BASIS G500 and G501 change from NORMAL to LO at 80 psig as measured at the instrument air receivers. These computer points can help determine if the loss of instrument air is resulting from a problem with the instrument air dryers or the instrument air compressor.

2.3 IF both Pl-15-*20A, "Instrument Air Header Pressure Indicator" (PX),

BASIS AND Pl-15-*20B "Instrument Air Header Pressure Indicator" (PX), at *OC655 are less than 85 psig, THEN PERFORM the following:

2.3.1 IF pressure remains less than 85 psig, THEN REDUCE reactor power to less than 44% in accordance with GP-5, Appendix 2, Section 3.1, Reducing Rx Power, AND Reactor Maneuvering Shutdown Instructions.

Reducing reactor power will reduce feedwater flow rate and provide the feed pump control system greater margin to maintain adequate feed to the reactor should feed pump or condensate pump minimum flow valves start to drift open on low instrument operating air pressure. Also, a reactor scram, should it occur, would be a less severe transient when initiated at a lower reactor power.

BASIS ON-119 BASES, Rev. 28 Page 3 of 12 JHG:jhg 2.3.2 MONITOR control rod positions for inadvertent inward drifting via Control Rod Position Report AND ROD DRIFT (*08-F-4) alarm.

2.3.3 IF control rods drift, THEN manually SCRAM the reactor AND PLACE Mode Switch in "SHUTDOWN" AND ENTER T-100, SCRAM OR T-101, as applicable..

Low Instrument Air pressure could cause CRD HCU scram valves to drift open, resulting in the associated control rods to insert. Operation at power with an abnormal rod pattern could result in a highly undesirable core power distribution.

2.3.4 REVIEW GP-5 Appendix 2, Section 3.1, Reducing Rx Power, AND ENSURE all required actions are performed for power reductions.

BASIS Self explanatory BASIS 2.3.5 MONITOR reactor water level AND reactor feedwater flow for possible loss of feedwater due to condensate/RFPT min. flow valves failing open.

The condensate pump minimum flow valve and the reactor feed pump minimum flow valves fail open on a loss of operating air. Should any of these valves drift open while at high power, a loss of feed in excess of feed system reserve capacity could result.

BASIS 2.3.6 IF reactor water level drops, THEN ENTER OT-100 AND EXECUTE concurrently.

OT-100, Reactor Low Level, gives the immediate operator actions for low reactor water level.

2.3.7 MONITOR feedwater string operation for loss of feedwater heating.

BASIS The dump valves associated with the feedwater heaters fail open on a loss of operating air.

Should any of these valves drift open, feedwater heating would be reduced, and increased feed subcooling could elevate core thermal power above the 100% load line.

BASIS 2.3.8 IF feedwater heating is lost OR partially lost, THEN ENTER OT-104 AND EXECUTE concurrently.

ON-119 BASES, Rev. 28 Page 4 of 12 JHG:jhg OT-104, Unexpected/Unexplained Reactivity Insertion, gives the immediate operator actions for a reactivity insertion resulting from a loss of feedwater heating.

2.3.9 MONITOR condenser vacuum for possible loss of vacuum.

BASIS The steam jet air ejector steam supply pressure control valves and air ejector discharge (recirc to the condenser) pressure control valves fail open on a loss of operating air. The level control valves associated with the offgas preheater, after condenser, and hold-up pipe drains fail closed. Should any of these valves drift to their failed position, condenser vacuum could be adversely affected.

BASIS 2.3.10 IF condenser vacuum drops, THEN ENTER OT-116 AND EXECUTE concurrently.

OT-116, Loss of Condenser Vacuum, gives the immediate operator actions for loss of condenser vacuum.

WARNING With Service Air header isolated from the Service Air compressor, Backup Service Air must be available to the affected Unit to ensure a continued supply of breathing air AND to refuel floor seals.

2.4 ENSURE Backup Service Air is in service AND can supply the affected Unit Service Air header.

BASIS Service Air header will be isolated from the Service Air compressor on a low Instrument Air condition. Backup Service Air should be in service and selected to the appropriate Unit so that air will be supplied to users such as breathing air and fuel pool inflatable seals.

ON-119 BASES, Rev. 28 Page 5of12 JHG:jhg 2.5 DISPATCH operator to:

BASIS 2.5.1 VERIFY TECW cooling water available to compressors which will not start AND remain loaded.

A loss of compressor cooling is the most likely source of compressor trouble.

BASIS 2.5.2 MONITOR *A(B)-C130 Instrument Air Dryer prefilter AND after filter differential pressures at *OC130A(B).

2.5.3 IF *A(B) Instrument Air Dryer prefilter OR after filter differential pressures are greater than 5 psid, THEN PLACE appropriate standby filter in service per S15.6.E Clogged air dryer filters could be at fault. Valving into service the standby filters takes relatively little time.

NOTE

1.

The Instrument Air Dryer control power switch is located on the bottom right hand side of *A(B)-C130 INSTRUMENT AIR DRYER CONTROL PANEL. The ON position for the switch is IN (toward the panel) and the OFF position is OUT (away from the panel.)

2.

Turning off control power to the Instrument Air Dryer will cause both tower inlet valves to electrically fail open AND the exhaust and re-pressurization valves to electrically fail closed.

This allows a continuous flow of air through both dryer towers to the associated instrument air header.

3.

Operating with both dryer towers in service AND !!Q regeneration cycle for prolonged periods of time will result in decreased dryer performance and higher dew points.

4.

Do not allow the Instrument Air Dryer to be operated at a dew point higher than -10 degrees F, OR with desiccant indicator having a pink color.

2.5.4 IF *A(B) Instrument Air Dryer has continuous exhaust flow for more than 3 minutes OR there is no flow through either dryer tower as indicated on Fl-015-*40A/C

BASIS ON-119 BASES, Rev. 28 Page 6of12 JHG:jhg THEN PLACE Instrument Air Dryer control power switch in the OFF position (away from the panel).

Turning dryer off will stop continuous blowdown and end pressure decrease.

BASIS 2.5.5 CLOSE 15-*042, "Service Air Comp Air Receiver Outlet" (328-T1-217/357-T5-217).

Both Instrument Air receivers less than 70 psig should cause the automatic Service Air header isolation valve to close, dedicating the output of the Service Air compressor to the Instrument Air system. Should a fault exist downstream of the automatic isolation valve and that valve not fully close, Service Air system capacity as a backup source of air could be degraded.

NOTE

1.

Following step assumes Service Air was backing up "A" Instrument Air Header at time of pressure loss.

2.

IF Service Air was backing up "B" Instrument Air header, BASIS THEN 15-*009A, "Service Air To "A" Inst Air Tie Viv," would be closed AND 15-*009B, "Service Air To "B" Inst Air Tie Viv," would be opened.

2.5.6 IF Service Air compressor is still operating AND Instrument Air pressure is not increasing, THEN PERFORM the following:

1.

CLOSE 15-*009A(B), "Service Air To A(B) Inst Air Tie Viv" (328-T1-217/357-T5-217).

2.

OPEN 15-*009B(A), "Service Air To B(A) Inst Air Tie Viv", in an attempt to repressurize the header (328-T1-217/357-T5-217).

In the case of a failure of B(A) Instrument Air compressor and a coincident failure of A(B)

Instrument Air header (i.e. line break), it would be appropriate to isolate Service Air to the A(B) header and to valve it into the B(A) header.

BASIS ON-119 BASES, Rev. 28 Page 7of12 JHG:jhg 2.5.7 IF Service Air compressor discharge pressure is greater than Instrument Air compressor discharge pressures, THEN OPEN 15-*027, "Service Air to Inst Air Tie Viv" (328-T1-217/357-T5-217).

Service air pressure should not be significantly greater than Instrument Air header pressure since the Service/Instrument Air header cross-tie check valve augments Service Air to the Instrument Air header. However, if the cross-tie check valve was to malfunction (not open),

Service Air pressure could be greater than Instrument Air pressure. Only in this situation should the cross-tie check valve be bypassed to restore the backup air supply to Instrument Air.

CAUTION

1.

Jeopardizing an operating Unit by supplying Instrument Air to the other Unit should be avoided.

2..

IF the Instrument Air problem has been identified AND the operating Unit will not be adversely affected by cross connection, THEN the following step should be used.

2.5.8 IF Instrument Air pressure has not been re-established AND the other Unit's Instrument Air system is available, THEN CROSS CONNECT Instrument Air between Units 1 and 2 as follows:

1.

MONITOR operating Unit Instrument Air system during cross connection efforts.

2.

ENSURE OPEN 15-0563A, "A Inst Air Hdr To & From Unit #2 Turbine Area Stop Valve" (277-T9*200) located just south-east of 2B RFP Lube Oil Reservoir, AND 15-0563B, "B Inst Air Hdr To & From Unit #2 Turbine Area Stop Valve" (277-T9*200) located south of room 276A against wall 8 ft up.

BASIS ON-119 BASES, Rev. 28 Page 8of12 JHG:jhg

3.

Slowly OPEN 15-01 OOA, "Unit 1 To Unit 2 Inst Air A Hdr Tie Valve" (258-A8-200) located just north of the A MCR Chiller, AND 15-01 OOB, "Unit 1 To Unit 2 Inst Air B Hdr Tie Valve" (263-A8-200) located about 10 ft east of the B MCR Chiller.

4.

IF operating Unit Instrument Air system performance is degraded, THEN TERMINATE cross connection efforts.

If all previous efforts to restore Instrument Air have failed, cross connection between the two Units may be considered. The possible adverse consequences to the non-affected Unit need to be carefully considered prior to cross connecting air systems. An operating Unit could be inadvertently tripped or otherwise unfavorably affected. The malfunction in the affected Unit air system must be identified and understood prior to considering this corrective action. Slowly opening cross connection valves while monitoring the non-affected Unit air system performance should allow termination of the evolution if significant pressure losses or other non-desirable events occur.

2.6 IF pressure can not be restored to either Instrument Air header, THEN COMMENCE rapid plant shutdown per GP-4.

BASIS The plant cannot operate indefinitely without proper pressure present in at least one-of the two Instrument Air headers. Should the determination be made that Instrument Air cannot be restored, the plant should be shutdown in a controlled fashion before Instrument Air loss degrades plant systems in a random unpredictable manner.

BASIS 2.6.1 WHEN all control rods are inserted per GP-4 THEN TRIP *A AND *B ASD Systems via pushbutton PB-043-*02A, "*A ASD Normal Stop" AND PB-043-*02B, "*B ASD Normal Stop" The drywell chilled water system shuts down, and the reactor recirculation pump mechanical seal purge supply isolation valves fail closed on a loss of Instrument Air. The reactor recirc pumps are not needed when the reactor is shut down and should not be operated without seal purge and motor airspace cooling.

BASIS NOTE MSIVs may begin to drift closed.

ON-119 BASES, Rev. 28 Page 9of12 JHG:jhg 2.6.2 IF Main Condenser can not be maintained as a heat sink, THEN PERFORM the following:

1.

CLOSE inboard AND outboard MSIVs.

2.

ENSURE HV-41-*F016, "Main Stm Line Drain Inboard PCIV" (STEAM DRAINS INBOARD),

AND HV-41-*F019, "Main Stm Line Drain Outboard PCIV" (STEAM DRAINS OUTBOARD), closed at *OC601.

3.

ENTER T-101 for reactor vessel pressure AND level control.

The main condenser is not a maintainable heat sink without Instrument Air. The auxiliary boilers become inoperable, the offgas system drain valves fail closed, and the mechanical vacuum pump suction isolation valve fails closed on a loss of Instrument Air. Isolating reactor pressure vessel steam protects the main turbine, condenser and associated auxiliary systems by forcing decay heat to be deposited in the suppression pool where the energy can be dissipated by systems not dependent upon Instrument Air.

NOTE Placing RECW in service to cool the Drywell will violate primary containment integrity.

BASIS 2.6.3 SECURE Drywell Chilled Water per S87.2.A AND CONSIDER placing RECW in service to cool the Drywell per S13.6.D.

The Drywell Chilled Water System will shut itself down on a loss of Instrument Air and so should be secured in a controlled fashion. RECW backup to DWCW may be able to be placed in service, however, primary containment will be violated. (Ref. 3.3.2)

ON-119 BASES, Rev. 28 Page 10 of 12 JHG:jhg 2.6.4 MONITOR secondary containment pressure.

BASIS 2.6.5 IF Reactor Enclosure HVAC isolates, THEN PERFORM the following:

1.

ENSURE SGTS maintains secondary containment pressure at least negative 0.25 inches of water pressure.

2.

IF secondary containment pressure can not be maintained THEN ENTER ON-111 AND EXECUTE concurrently.

Reactor building ventilation supply and exhaust dampers fail closed on a loss of Instrument Air, tripping their respective fans. The recirculation and standby gas treatment systems should still function to maintain proper negative secondary containment pressure. The operator should monitor secondary containment pressure to ensure pressure is controlled within Technical Specifications requirements. ON-111, Loss Of Secondary Containment, provides the operator actions in the event secondary containment pressure can not be maintained.

2.6.6 MONITOR following levels AND TAKE manual action, as necessary, to control level.

RECW Head Tank TECW Head Tank BASIS The automatic makeup valves for these tanks fail closed on a loss of Instrument Air.

Main Condenser Hotwell BASIS The coarse and fine condensate makeup and reject valves all fail closed on a loss of Instrument Air.

Condensate Storage Tank BASIS The Condensate Storage Tank (CST) makeup isolation valve fails closed. Additionally with the condensate makeup and reject valves failing closed, if a condensate pump is in service, CST level could actually rise if a reject valve leaks by.

BASIS ON-119 BASES, Rev. 28 Page 11 of 12 JHG:jhg 2.6.7 MINIMIZE evolutions that discharge water to Radwaste.

The radwaste processing systems are inoperable without Instrument Air. Any water collected by the drain collection systems will accumulate in the Floor Drain Collection Tank, the Equipment Drain Collection Tank, and the Chemical Waste Tank. Unnecessary depletion of the available storage capacity of these tanks is undesirable.

UNIT 2 ONLY 2.6.8 IF the loss of instrument air occurred on Unit 2 THEN SECURE Auxiliary Boilers per S21.2.A.

BASIS The Auxiliary Boilers will shut themselves down on a loss of Instrument Air and so should be secured in a controlled fashion. Instrument air is supplied to the auxiliary boilers from the 2A and 2B Instrument air compressors. Thus, the auxiliary boilers only need to be secured if pressure cannot be restored to the 2A or 2B instrument air header.

BASIS 2.6.9 MONITOR Reactor Pressure.

2.6.10 IF Reactor begins to depressurize due to the SSE main steam supply valve PV-C-07-*53, "Stm Seal Evap Main Stm." failing open THEN CLOSE HV-07-*50, "Main Stm to SSE Inlet Viv. (Stm Sup)".

The Steam Seal Evaporator main steam supply valve PV-C-07-*53 fails open on a loss of air.

The Reactor may depressurize through the SSE and through the main steam supply pressure relief valves PSV-07-*51A(B)(C)(D)(E)(F). Closing HV-07-*50 will isolate main steam from the SSE and prevent Reactor Depressurization.

2.7 ENSURE IR created for engineering to evaluate the need for instrument air quality testing.

BASIS Self-Explanatory

3.0 REFERENCES

3.1 TECHNICAL SPECIFICATIONS NONE 3.2 INTERFACING PROCEDURES 3.2.1 GP-4, Rapid Plant Shutdown To Hot Shutdown ON-119 BASES, Rev. 28 Page 12 of 12 JHG:jhg 3.2.2 GP-5 Appendix 2, Planned Rx Maneuvering Without Shutdown 3.2.3 ON-111, Loss Of Secondary Containment 3.2.4 OT-100, Reactor Low Level 3.2.5 OT-104, Unexpected/Unexplained Reactivity Insertion 3.2.6 OT-116, Loss of Condenser Vacuum 3.2.7 S13.6.D, RECW Operation With Loss of Drywell Chilled Water 3.2.8 S15.6.E, Placing Standby Instrument Air Dryer Prefilter/Afterfilter In Service 3.2.9 S21.2.A, Shutdown of an Auxiliary Boiler 3.2.10 S87.2.A, Normal Shutdown Of The Drywell Chilled Water System 3.2.11 T-100, SCRAM/SCRAM Recovery 3.2.12 T-101, RPV Control 3.3 OTHER 3.3.1 CM-1 SOER 88-01, Rec. #1, T01785 3.3.2 NCR 94-00254

NRC Post Exam Comment Resolution 2017 Limerick NRC Initial License Exam SRO Question #92 Facility Request Accept two correct answers (Key Answer D and also Choice B).

NRC Resolutions Delete the question from the exam.

Reasoning Applicants are asked in the first part of this two-part question to select a T-225 action (either "spray the drywell" or "spray the suppression pool"). Then, in the second part of the question they are asked whether the chosen "action" requires field manual operations completed outside the main control room. An argument can be made for a "no" response in the second part of the question (Answer Choice B) because suppression pool spray can be initiated without the field action to initiate cooling of the spray water. An equally valid argument can be made for a "yes" response in the second part of the question {Key Answer Choice D) because the system alignment per the T-225 procedure does establish cooling of the spray water, which requires field manual operations completed outside the main control room.

Per the guidance in NUREG-1021, ES-403, Section D.1.c, the question will be deleted from the exam because it has two correct answers that contradict each other. Choice B states that no local manual operation is required, whereas Choice D states that local manual operation is required.

2017 Limerick ILT NRC Exam Post-Exam Challenges Question #92 SRO Unit 1 is operating at 100% power when a LOCA occurs Plant conditions are as follows; Drywell pressure is 14 psig Drywell temperature is 248 degrees Reactor level is -140 inches up slow with HPCI Suppression pool level is 42 feet 012 bus lockout occurs 013 load center breaker trips and cannot be reclosed Which of the following describes (1) the T-225 action to be taken by the CRS and (2) whether local manual operation, outside the MCR, of RHRSW Heat Exchanger Inlet and/or Outlet Valve(s) is required to complete the action?

A.

(1) Spray the Drywell (2) No B.

(1) Spray the Suppression Pool (2) No C.

(1) Spray the Drywell (2) Yes D.

( 1) Spray the Suppression Pool (2) Yes Answer:

D Immediately following this Discussion is the Answer Explanation for Question #92 as it appeared on the SRO portion of the Approved Exam Key.

Discussion Question 92 Part 1 Part 1 of the question tests the SRO applicants knowledge of the impact of high Suppression Pool water level on the T-225 Containment Spray strategy directed from Procedure T-102. Use of the stem information is required for the SRO applicant to successfully select the correct procedural action for the emergency situation.

Suppression Pool level of 42 feet is given in the stem.

2017 Limerick ILT NRC Exam Post-Exam Challenges The assessment into whether spraying the Suppression Pool is permitted is assessed by the SRO applicants in T-102 step PC/P-7. Spraying of the Suppression Pool is permitted provided Suppression Pool level is below 48 feet.

The assessment into whether spraying the Orywell is permitted is assessed by the SRO applicants in T-102 step PC/P-10.

Spraying of the Orywell is not permitted if Suppression Pool level is greater than 37.4 feet.

For the above reasons, the SRO applicants' assessment of the facility conditions results in the selection of T-225 section 4.2, Initiating Suppression Pool Spray using RHR. The correct answer to part 1 is, "Spray the Suppression Pool".

Question 92 Part 2 Part 2 of Question 92 was developed with the intent to determine whether or not the applicant understood the impact of the power losses, described in the stem, on the Unit 1 RHR components and their functions in completing all of the steps directed by T-225 Section 4.2, Initiating Suppression Pool spray using RHR. To complete this section of the procedure the applicant was expected to understand that following establishment of the required RHR system flow path and flow rate, T-225 section 4.2 concludes with directing the performance of S12.1.A, RHR Service Water System Startup.

Based on the stem condition which states that the 013 load center breaker trips and cannot be reclosed all electrical loads downstream of this breaker will be without power.

The 1A RHR Heat Exchanger RHRSW Outlet Valve (HV-051-1F068A), a normally closed valve, is powered from 0134-R-H-19. 0134-R-H-19 is a downstream load off of the 013 load center and therefore the motor operator to HV-051-1 F068A has no power.

T-225, Startup and Shutdown of Suppression Pool and Orywell Spray Operation Revision 22 section 4.2, Initiating Suppression Pool Spray Using RHR, has the operator establish a spray flowpath of RHR taking a suction from the Suppression Pool and returning it to the suppression pool via the Full Flow Test Return Valve (HV-51-1 F024A) and the RHR Suppression Pool Spray Line PCIV (HV-51-1F027A(B)). Once this flow path is established, the operator is directed to monitor Suppression Pool Pressure, and Suppression Pool Air Space Temperature. At this point in the procedure Suppression Pool spray has been established as confirmed by the operator action to verify the response of Suppression Pool Pressure and Air Space Temperature.

Once the RHR system is in service and spraying the suppression pool, T-225 directs starting the RHR Service Water Pump for the in-service RHR Heat Exchanger per S12.1.A. With the electrical conditions stated previously, Step 4.1.5.2 of S12.1.A directs the operator to manually open HV-51-1 F068A approximately 150 turns. This valve is located in the Unit 1 Reactor Enclosure Elevation 201' in the 1 A and 1 C RHR room.

Operation of this valve under those conditions is a local manual operation and is required to complete both S12.1.A and Section 4.2 of T-225. Therefore based on the original intent of the question choice 'O' is correct.

2017 Limerick ILT NRC Exam Post-Exam Challenges However, associating the action in part 1 (spraying the Suppression Pool) with the requirements to line up RHRSW per S12.1.A in part 2 was not clearly established.

Based on the construction of T-225 Section 4.2 which clearly established monitoring of the impact of Suppression Pool Sprays after establishing the AHR system in service, and before placing RHRSW in service, the applicants correctly applied T-225 steps and determined that the AHR system could achieve the required flow path and flow rate required for Suppression Pool Spray without the need for RHRSW as a supporting system. Therefore local-manual operation of RHRSW Heat Exchanger Inlet and/or Outlet Valve(s) was determined to not be required and Choice B also becomes a correct answer.

Due to the question stem not delineating between the required actions to physically establish suppression pool spray and the completion of the entire section of T-225 for Suppression Pool Spray, the question was able to be interpreted in two ways as described above. These two interpretations resulted in both answers Band D being equally correct.

Applicant Comments:

Discussions with the applicants during post exam review revealed that the three (3) applicants that selected "No" for part 2 interpreted part 2 of the question to be asking, "Is local-manual operation of RHRSW Heat Exchanger Inlet and or Outlet valves required to establish an AHR system flow path that generates the required AHR flow rate for spray of the Suppression Pool?" Given this interpretation, the applicants correctly applied T-225 steps and determined that the AHR system could achieve the required flow path and flow rate required for Suppression Pool Spray without the need for RHRSW system operation or the use of local-manual operation of RHRSW Heat Exchanger Inlet and/or Outlet Valve(s).

Facility Recommendation Due to the question stem not delineating between the required actions to physically establish suppression pool spray and the completion of the entire section of T-225 for Suppression Pool Spray and placing RHRSW in service, the question was interpreted in two ways as described above. These two interpretations resulted in both answers B and D being equally correct. The facility agrees with applicants and as a result recommends that both choices 'B' and 'D' be taken as a correct answer to question 92.

References:

1. T-102, Primary Containment Control, Rev 25

2. T-225, Startup and Shutdown of Suppression Pool and Drywell Spray Operation, Rev22
3. S12.1.A, AHR Service Water System Startup, Rev 53

92 2017 Limerick ILT NRC Exam Post-Exam Challenges ID: 1454490 Points: 1.00 Answer Explanation A

Incorrect plausible to examinee who does not diagnose >37.4 feet suppression pool level, and that drywell spray is prohibited per PC/P-10 of T-102. plausible to the examinee who does not recall that Div 3 power supplies the A AHR htx outlet valve.

B Incorrect plausible to the examinee who does not recall that Div 3 power supplies the A AHR htx outlet valve.

C Incorrect plausible to examinee who does not diagnose >37.4 feet suppression pool level, and that drywell spray is prohibited per PC/P-10 of T-102.

D Correct examinee recognizes safe to spray but realizes suppression pool level is too high to spray the Drywell and directs pool spray. With a loss of 013 load center the A RHRSW outlet valve to the AHR HTX has no power and must be opened manually. 812.1.A which is directed from T-225 includes direction for manual operation of RHRSW valves if required.

2017 Limerick ILT NRC Exam Post-Exam Challenges Question 92 Info Question Type:

Multiple Choice Status:

Active Always select on test?

No Authorized for practice?

No Points:

1.00 Time to Complete:

3 Difficulty:

3.00 System ID:

1454490 User-Defined ID:

Q# 92 NEW Lesson Plan Objective:

LGSOPS1560.06 Topic:

SRO FLA action cont. SPRAY RO:

3.8 SRO:

f4.0 KA#:

~26001 2.4.35

2017 Limerick ILT NRC Exam Post-Exam Challenges omments:

. Containment Spray System Mode Knowledge of local

' auxiliary operator tasks during an emergency and the resultant operational effects.

i~~\\:

>:~1,~ 1

      • /hv'".
  • UNIT 1 ONLY *
  • EXELON NUCLEAR LIMERICK GENERATING STATION T-225, Rev. 22 Page 1 of 44 RCB:tm T-225 STARTUP AND SHUTDOWN OF SUPPRESSION POOL AND DRYWELL SPRAY OPERATION 1.0 PURPOSE 1.1 To Spray Suppression Pool/Drywell air space using RHR.

1.2 To bypass interlocks of Containment Spray Isolation valves, in preparation for initiating Containment Spray using only one loop of RHR.

1.3 To Spray Drywell/Suppression Pool Air Space using RHR Service Water Loop 'B' 1.4 To Spray Drywell/Suppression Pool air space using Fire System.

2.0 REFERENCES

2.1 T-102, Primary Containment Control 2.2 SAMP-1, Sheets 2 through 7, RPV and Primary Containment Flooding Control 2.3 M-1-E-11-1040, RHR Elementary Diagram 2.4 M-51, P&ID - RHR System 2.5 A41-801 O-K5 - ECCS Operation and Maintenance Instruction 2.6 L.B. Pyrih letter to M.J. McCormick, dated June 27, 1990, LGS Diesel Generator Loading Limitations.

2.7 RT-6-100-904-1, Routine Inspection of OSC T-200 Series Locker

  • UNIT 1 ONLY *
  • T-225, Rev. 22 Page 2 of 44 RCB:tm 2.8 RT-6-100-905-1, Routine Inspection of T-200 Series Hose Locker 2.9 RT-6-100-906-1, T-200 Procedure Tag And Banana-Jack Accountability 2.10 S12.1.A, RHR Service Water System Startup 2.11 S12.2.A, Shutdown Of RHR Service Water Pumps And System 2.12 S58.1.B, Startup Of Containment Hydrogen Recombiner From Standby Condition Or Following A Trip 2.13 S43.2.A, Shutdown Of A Recirculation Pump 2.14 SE-10, LOCA 2.15 S51.1.A, Set Up Of RHR System For Automatic Operation On LPCI Mode 2.16 ECR 96-00899, HV-51-1F027B Overtorque 2.17 ECR 96-00219, HV-51-1F016A Overtorque 3.0 PREREQUISITES 3.1 TRIP OR SAMP procedures must direct the use of this procedure.

3.2 RHR System aligned per S51.1.A, Set Up Of RHR System For Automatic Operation in LPCI Mode.

  • UNIT 1 ONLY *
  • NOTE Step 3.3 is only required for the following conditions:

NO LOCA signal present Initiation pushbuttons in the Main Control Room fail to operate T-225, Rev. 22 Page 3 of 44 RCB:tm 3.3 The following tools/equipment obtained from Unit 1 T-200 Cabinet in OSC, BL-840 key required.

(1) Slotted Screwdriver (1) Screwholding Screwdriver (4) Electrical Jumpers (1) Flashlight (1) LV-100 key NOTE Step 3.4 required only for section 4.4 OR 4.7 (Initiating Suppression Pool Spray Using Fire Protection System Crosstie OR Initiating Drywell Spray Using Fire Protection System Crosstie).

3.4 Necessary tools/equipment obtained from Unit 1 T-225/T-244 Hose Storage Locker (402-R16-253) BL-840 key required (ATTACHMENT 5).

  • UNIT 1 ONLY *
  • 4.0 PROCEDURE NOTE Conditional IF... THEN steps that are not applicable T-225, Rev. 22 Page 4 of 44 RCB:tm AND steps to be skipped per direction of the IF... THEN step shall be marked N/A AND initialed.

CAUTION

1.

Use of two loops of Drywell Spray can result in Containment Damage due to excessive negative pressure.

2.

IF the EOG is carrying the respective Bus, THEN the EOG load must be below 1000 kw prior to starting an RHR Pump, to prevent loss of the other EOG loads.

Consider removing the following loads as required to obtain less than 1000 kw on the respective Bus:

Core Spray Pump 529 kW RHRSW Pump 519 kW ESW Pump 389 kW MCR Chiller 309 kW 4.1 LINEUP SUPPRESSION POOL OR DRYWELL SPRAY 4.1.1 SPRAY Suppression Pool as directed by T-102 OR SAMP-1 as follows:

IF spraying Suppression Pool using RHR THEN GO TO Section 4.2 IF spraying Suppression Pool using RHR Service Water THEN GO TO Section 4.3 IF spraying Suppression Pool using Fire System Cross tie THEN GO TO Section 4.4

  • UNIT 1 ONLY *
  • 4.1.2 SPRAY Drywell as directed by T-102 OR SAMP-1 as follows:

IF spraying drywell using RHR THEN GO TO Section 4.5 IF spraying drywell using RHR Service Water THEN GO TO Section 4.6 IF spraying drywell using Fire System Crosstie THEN GO TO Section 4. 7 4.2 INITIATING SUPPRESSION POOL SPRAY USING RHR 4.2.1 ENSURE HV-51-1F004A(B), "1A(B) RHR Pump Suction PCIV," (SUCTION A(B)) open.

4.2.2 ENSURE the following valves closed:

HV-51-1F006A(B), "1A(B) RHR Pp S/D Clg Suet lntertie Viv" (SUCTION A(B))

HV-51-1F015A(B), "1A(B) Shutdown Clg Injection PCIV" (OUTBOARD)

HV-51-1F016A(B), "1A(B) RHR Cntmt Spray Line Outboard PCIV" (OUTBOARD)

HV-51-1 F017A(B), "1A(B) RHR LPCI lnj PCIV" (OUTBOARD A(B))

4.2.3 IF RHR pump not running THEN start 1A(B)P202 "RHR Pump" 4.2.4 ENSURE the following valves open:

HV-51-1F047A(B), "1A(B) RHR Htx Shell Side Inlet Viv" (INLET)

HV-51-1 F003A(B), "1A(B) RHR Htx Shell Side Outlet Viv" (OUTLET)

HV-C-51-1F048A(B), "1A(B) RHR Htx Shell Side Bypass Viv" (HEAT EXCH BYPASS)

T-225, Rev. 22 Page 5 of 44 RCB:tm

  • UNIT 1 ONLY *
  • T-225, Rev. 22 Page 6 of 44 RCB:tm 4.2.5 OPEN HV-51-1 F024A(B), "1A(B) RHR Pp Full Flow Test Return Viv" (SUPP POOL CLG A(B)

AND OBTAIN flow of 8,000 to 8,500 gpm as indicated on Fl-51-1 R603A(B), FL.

4.2.6 OPEN HV-51-1 F027A(B), "1A(B) RHR Supp Pool Spray Line PCIV" (SUPP POOL SPRAY).

4.2.7 MONITOR the following:

PR-57-101. "Suppression Pool Pressure" (PX)

TR-57-110. "Suppression Pool Air Space Temperature" (TP)

AND TR-57-122, "Drywell Temperature" (TP)

Fl-51-1 R603A(B), "RHR System Flow" (FL)

AND Tl-51-127A(B), "RHR Htx Outlet" (TP) 4.2.8 PLACE RHR Service Water Pump for RHR Heat Exchanger to be used in service per S12.1.A, RHR Service Water System Startup.

NOTE RHR Heat Exchanger Shell Side Bypass Valve opens automatically on LOCA initiation AND receives an open signal for three minutes following LOCA initiation.

4.2.9 CLOSE HV-C-51-1F048A(B), "1A(B) RHR Htx Shell Side Bypass Viv" (HEAT EXCH BYPASS).

CAUTION Maintaining greater than 1,500 gpm flow will prevent pump damage.

4.2.10 IF more spray flow is required, THEN REDUCE flow through Full Flow Test line by throttling closed HV-51-1 F024A(B), "1A(B) RHR Pp Full Flow Test Return Viv" (SUPP POOL CLG A(B)).

  • UNIT 1 ONLY *
  • 4.2.11 WHEN shutdown of Suppression Pool Spray using RHR is required, THEN PERFORM section 4.8.

T-225, Rev. 22 Page 7 of 44 RCB:tm 4.3 INITIATING SUPPRESSION POOL SPRAY USING RHR SERVICE WATER 4.3.1 ENSURE 1BP202, "RHR Pump" not running.

4.3.2 ENSURE the following valves closed:

HV-51-1F004B, "1B RHR Pump Suction PCIV" (SUCTION B)

HV-51-1 F006B, "1 B RHR Pp S/D Clg Suet Viv" (SUCTION B)

HV-51-1F015B, "1B Shutdown Clg Injection PCIV" (OUTBOARD)

HV-51-1F016B, "1B RHR Cntmt Spray Line Outboard PCIV" (OUTBOARD)

HV-51-1F017B, "1B RHR LPCI lnj PCIV" (OUTBOARD B)

HV-51-1 F024B, "1 B RHR Pp Full Flow Test Return Viv" (SUPP POOL CLG B)

HV-51-1 F027B, "1 B RHR Supp Pool Spray Line PCIV" (SUPP POOL SPRAY)

HV-51-1F047B, "1B RHR Htx Shell Side Inlet Viv" (INLET)

HV-C-51-1F048B, "1B RHR Htx Shell Side Bypass Viv" (HEAT EXCH BYPASS) 051-1 F098, "Cond Trans Fill lsol Viv to 1A & 1 B RHR Loops" (402-R11-253) (ATTACHMENT6)

  • UNIT 1 ONLY *
  • 4.3.3 PLACE the following handswitch in "BYPASS" at OOC667 (Main Control Room) to prevent an inadvertent trip:

HSS-012-0028, "B/D RHRSW Pump RHR Htx High Rad Trip Keylock Bypass B/D" (B/D) 4.3.4 PLACE RHR Service Water Loop B in service using B ORD RHR Service Water pump per S12.1.A, RHR Service Water System Startup.

CAUTION IF a LOCA signal is present AND differential pressure across HV-51-1F017B, "1B RHR LPCI lnj PCIV,"

(OUTBOARD B) drops below 74 psid, THEN injection valve will automatically open AND RHR Service Water will add inventory to the vessel.

4.3.5 OPEN the following RHR Service Water/RHR Emergency Crosstie Valves at 1 OC601 (Main Control Room):

HV-51-1 F073, "RHR Service Water Crosstie" (CROSSTIE)

HV-51-1 F075, "RHR Service Water Crosstie" (CROSSTIE)

T-225, Rev. 22 Page 8 of 44 RCB:tm

  • UNIT 1 ONLY *
  • NOTE Step 4.3.6 will require coordination between an Operator at OOC667 AND a second Operator at 1 OC601.

4.3.6 Simultaneously PERFORM the following to maintain RHR Service Water discharge pressure 75 to 120 psig as indicated on Pl-12-0018-1, "Pump B/D Disch" (Px), at OOC667 (Main Control Room):

Throttle CLOSED HV-51-1 F068B, "1 B RHR Htx SW Outlet Viv" (1 B) at OOC667 (Main Control Room).

T-225, Rev. 22 Page 9 of 44 RCB:tm Throttle OPEN HV-51-1 F027B, "1 B RHR Supp Pool Spray Line PCIV" (SUPP POOL SPRAY) at 1 OC601 (Main Control Room) to spray suppression pool.

4.3. 7 WHEN shutdown of Suppression Pool Spray using RHR Service Water is required, THEN PERFORM section 4.9.

  • UNIT 1 ONLY *
  • T-225, Rev. 22 Page 10 of 44 RCB:tm 4.4 INITIATING SUPPRESSION POOL SPRAY USING FIRE PROTECTION SYSTEM CROSSTIE 4.4.1 PERFORM the following in 402-R16-253 (ATTACHMENT 5):
1.

CONNECT hose at 51-1179 "1B RHR Fire Protection Crosstie Connection Drain Valve" AND ROUTE to drain THEN CYCLE 51-1179 open AND closed to ensure piping vented.

2.

CONNECT hose at 22-1430, "Fire Protection/RHR Interconnection Drain Viv" AND ROUTE to drain THEN CYCLE 22-1430 open AND closed to ensure piping vented.

3.

CONNECT hose to fitting downstream of 22-1429, "Fire Protection/RHR Interconnection Isolation Viv."

4.

CONNECT other end of hose to 51-1178, "1 B RHR Fire Protection Crosstie Connection Isolation Valve."

5.

OPEN 22-1429.

6.

OPEN 51-1178.

4.4.2 ENSURE the following valves are closed:

  • HV-51-1F047B, "18 RHR Htx Shell Side Inlet Viv" (INLET)
  • HV-C-51-1F048B, "1B RHR Htx Shell Side Bypass Viv" (HEAT EXCH BYPASS)
  • 051-1F098, "Cond Trans Fill lsol Viv to 1A & 1B RHR Loops" (402-R11-253) (ATTACHMENT 6')

4.4.3 ENSURE HV-51-1 F004B, "1 B RHR Pump Suction PCIV" (SUCTION B), closed.

  • UNIT 1 ONLY *
  • 4.4.4 ENSURE the following valves closed:

HV-51-1 F006B, "1 B RHR Pp S/D Clg Suet Viv (SUCTION B)

HV-51-1 F015B, "1 B Shutdown Clg Injection PCIV" (OUTBOARD)

HV-51-1F016B, "1B RHR Cnmt Spray Line Outboard PCIV" (OUTBOARD)

HV-51-1F017B, "1B RHR LPCI lnj PCIV" (OUTBOARD B)

HV-51-1F024B, "1B RHR Pp Full Flow Test Return Viv" (SUPP POOL CLG B)

T-225, Rev. 22 Page 11 of 44 RCB:tm HV-51-1F027B, "1B RHR Supp Pool Spray Line PCIV" (SUPP POOL SPRAY)

CAUTION IE a LOCA signal is present AND differential pressure across HV-51-1 F017B, "1 B RHR LPCI lnj PCIV,"

(OUTBOARD B) drops below 74 psid, THEN injection valve will automatically open AND Fire System will add inventory to the vessel.

4.4.5 Throttle OPEN HV-51-1 F027B, "1 B RHR Supp Pool Spray Line PCIV" (SUPP POOL SPRAY) at 1 OC601 (Main Control Room) to spray suppression pool.

  • UNIT 1 ONLY *
  • 4.4.6 ENSURE fire pump running as follows:
1.

IF starting OOP512, "Motor Driven Fire Pump,"

THEN DEPRESS HS-22-002-1 at OOC650 (Main Control Room)

AND VERIFY pump starts.

a.

IF OOP512, "Motor Driven Fire Pump," does not start from OOC650, THEN PERFORM one of the following:

1.

GO TO step 4.4.6.2 to start the diesel driven fire pump from the Main Control Room.

T-225, Rev. 22 Page 12 of 44 RCB:tm

2.

START OOP512, "Motor Driven Fire Pump," from the Circ Water Pump House by depressing HS-22-002-2 at OOC518 AND VERIFY pump starts.

2.

IF starting OOP511, "Diesel Driven Fire Pump,"

THEN DEPRESS HS-22-026-1 at OOC650 (Main Control Room)

AND VERIFY pump is running.

a.

IF OOP511, "Diesel Driven Fire Pump," does not start from OOC650, THEN PERFORM one of the following:

1.

GO TO step 4.4.6.1 to start the motor driven fire pump from the Main Control Room.

  • UNIT 1 ONLY *
  • T-225, Rev. 22 Page 13 of 44 RCB:tm
2.

ST ART OOP511, "Diesel Driven Fire Pump,"

from the Diesel Fire Pump Room as follows:

a.

PLACE control switch at OOC519 (Diesel Fire Pump Room) in "MANUAL A" AND DEPRESS AND HOLD HS-22-026-2 until diesel starts.

b.

IF diesel did not start, THEN PLACE control switch in "MANUAL B" at OOC519 AND DEPRESS AND HOLD HS-22-026-2 until diesel starts.

c.

VERIFY OOP511, "Diesel Driven Fire Pump," starts.

3.

IF OOP1512, "Motor Driven Fire Pump,"

AND OOP511, "Diesel Driven Fire Pump," are not available, THEN PLACE control switch for 1 OP402, "Backup Diesel Driven Fire Pump," in "TEST" at 1 OC096 (Lower Parking Lot Pump Enclosure)

AND VERIFY pump starts.

4.4. 7 WHEN shutdown of Suppression Pool Spray Using Fire Protection System Crosstie is required THEN PERFORM section 4.1 o.

4.5

  • UNIT 1 ONLY *
  • INITIATING DRYWELL SPRAY USING RHR 4.5.1 ENSURE HV-51-1F004A(B), "1A(B) RHR Pump Suction PCIV" (SUCTION A(B)), open 4.5.2 ENSURE the following valves closed:
  • HV-51-1F006A(B), "1A(B) RHR Pp S/D Clg Suet lntertie Viv" (SUCTION A(B))
  • HV-51-1F015A(B), "1A(B) Shutdown Clg Injection PCIV" (OUTBOARD A(B))
  • HV-51-1F016A(B), "1A(B) RHR CntmtSpray Line Outboard PCIV" (OUTBOARD A(B))
  • HV-51-1F017A(B), "1A(B) RHR LPCI lnj PCIV" (OUTBOARD A(B))

4.5.3 IF RHR pump not running THEN START 1A(B)P202 "RHR Pump."

4.5.4 ENSURE the following valves open:

  • HV-51-1F047A(B), "1A(B) RHR Htx Shell Side Inlet Viv" (INLET)
  • HV-51-1F003A(B), "1A(B) RHR Htx Shell Side Outlet Viv" (OUTLET)
  • HV-C-51-1F048A(B), "1A(B) RHR Htx Shell Side Bypass Viv" (HEAT EXCH BYPASS) 4.5.5 TRIP Reactor Recirc Pumps.

T-225, Rev. 22 Page 14 of 44 RCB:tm

  • UNIT 1 ONLY *
  • T-225, Rev. 22 Page 15 of 44 RCB:tm 4.5.6 REMOVE Drywell Cooling Fans from service by placing all 16 Drywell Cooler Fan switches to "OFF."

4.5.7 IF Drywell High Pressure AND LOCA signals are present, THEN GO TO step 4.5.11.

4.5.8 IF Drywell High Pressure AND LOCA signals are not present, THEN PERFORM step 4.5.9 for A Loop Operation OR step 4.5.10 for B Loop Operation.

4.5.9 PERFORM the following to initiate LOCA signal for A Loop:

1.

PLACE E11A-S61A, INITIATION, switch for A Loop operation at panel 1 OC601 (Main Control Room) to "ARM."

2.

DEPRESS AND RELEASE E11A-S61A.

3.

VERIFY LOOP A INJECTION white indicating light Lit.

4.

IF LOOP A INJECTION white indicating light not Lit, THEN INSTALL the following jumpers:

Jumper from FFF5-7 to FFF5-6 at 1 OC617 Bay A (Aux Equip Room) (ATTACHMENT 1)

Jumper from FFF9-2 to FFF9-1 at 1 OC617 Bay B (Aux Equip Room) (ATTACHMENT 2)

  • UNIT 1 ONLY *
  • T-225, Rev. 22 Page 16 of 44 RCB:tm 4.5.10 PERFORM the following to initiate LOCA signal for B Loop:
1.
2.
3.
4.

PLACE E11A-S61 B, INITIATION, switch for B Loop operation at panel 1 OC601 (Main Control Room) to ARM."

DEPRESS AND RELEASE E11A-S61 B.

VERIFY LOOP B INJECTION white indicating light Lit.

IF LOOP B INJECTION white indicating light not Lit, THEN INSTALL the following jumpers:

Jumper from EEE2-16 to EEE2-17 at 1 OC618 Bay B (Aux Equip Room) (ATTACHMENT 3)

Jumper from GGG?-11 to GGG?-12at10C618 Bay A (Aux Equip Room) (ATTACHMENT 4) 4.5.11 OPEN HV-51-1F024A(B), "1A(B) RHR Pp Full Flow Test Return Viv" (SUPP POOL CLG A(B)),

AND OBTAIN flow of 9,250 to 10,500 gpm as indicated on Fl-51-1R603A(B), FL.

4.5.12 OPEN only one loop HV-51-1F021A(B), "1A(B)

RHR Cntmt Spray Line Inboard PCIV" (INBOARD).

4.5.13 REQUEST SSV verify drywell temperature AND drywell pressure are on SAFE side of Drywell Spray Initiation Limit Curve per T-102, Primary Containment Control OR SAMP-1, RPV and Primary Containment Flooding Control.

  • UNIT 1 ONLY *
  • CAUTION T-225, Rev. 22 Page 17 of 44 RCB:tm 1.

Slowly throttling open Outboard Drywell Spray valve will prevent rapid pressure drop.

2.

Exceeding 11,000 gpm through RHR Heat Exchanger as indicated on flow indicator, Fl-51-1 R603A(B), FL, may cause Heat Exchanger damage.

4.5.14 Throttle OPEN only one loop HV-51-1F016A(B),

"1A(B) RHR Cntmt Spray Line Outboard PCIV" (OUTBOARD) to initiate spray AND OBSERVE raising flowrate as indicated on Fl-51-1 R603A(B), FL.

4.5.15 MONITOR Drywell pressure.

4.5.16 Throttle OPEN HV-51-1 F016A(B), "1A(B) RHR Cntmt Spray Line Outboard PCIV" (OUTBOARD)

AND Fully CLOSE HV-51-1 F024A(B),"1A(B)

RHR Pp Full Flow Test Return Viv", (SUPP POOL CLG A(B))

AND OBTAIN flow of 9,250 to 10,500 gpm as indicated on Fl-51-1 R603A(B), FL 4.5.17 PLACE RHR Service Water Pump for RHR Heat Exchanger to be used in service per S12.1.A, RHR Service Water System Startup.

NOTE HV-C-51-1 F048A will not close until 3 minute time delay is expired.

4.5.18 CLOSE HV-C-1 F048A(B), "1A(B) RHR Htx Shell Side Bypass Valve" (HEAT EXCHANGER BYPASS).

  • UNIT 1 ONLY *
Control, OR SAMP-1 RPV and Primary Containment Flooding Control AND TERMINATE Drywell Spray OR PREVENT LPCI Injection to prevent pump runout as directed.

4.5.20 IF shutdown of LPCI injection is required, THEN PERFORM the following:

1.

WHEN HV-51-1F017A(B), "1A(B) RHR LPCI lnj PCIV" (OUTBOARD A(B)) begins to open, THEN PLACE handswitch to "CLOSE" to energize override feature.

T-225, Rev. 22 Page 18 of 44 RCB:tm

2.
3.

PULL-TO-STOP HV-51-1F017A(B), OUTBOARD.

CLOSE HV-51-1 F017A(B), OUTBOARD.

4.5.21 WHEN shutdown of Drywell Spray using RHR is

required, THEN PERFORM section 4.11.
  • UNIT 1 ONLY *
  • T-225, Rev. 22 Page 19 of 44 RCB:tm 4.6 INITIATING DRYWELL SPRAY USING RHR SERVICE WATER 4.6.1 ENSURE 1 BP202, "RHR Pump" not running.

4.6.2 ENSURE the following valves closed:

HV-51-1 F004B, "1 B RHR Pump Suction PCIV" (SUCTION B)

HV-51-1 F006B, "1 B RHR Pp S/D Gig Suet lntertie Viv" (SUCTION B)

HV-51-1F015B, "1B Shutdown Gig Injection PCIV" (OUTBOARD)

HV-51-1F016B, "1B RHR Cntmt Spray Line Outboard PCIV' (OUTBOARD)

HV-51-1F017B, "1B RHR LPCI lnj PCIV" (OUTBOARD B)

HV-51-1F024B, "1B RHR Pp Full Flow Test Return Viv" (SUPP POOL CLG B)

HV-51-1 F027B, "1 B RHR Supp Pool Spray Line PCIV" (SUPP POOL SPRAY)

HV-51-1F047B, "1B RHR Htx Shell Side Inlet Viv" (INLET)

HV-C-51-1 F048B, "1 B RHR Htx Shell Side Bypass Viv" (HEAT EXCH BYPASS) 051-1 F098, "Cond Trans Fill lsol Viv to 1A & 1 B RHR Loops" (402-R11-253) (ATTACHMENT 6)

  • UNIT 1 ONLY *
  • 4.6.3 PLACE the following handswitch in "BYPASS" at OOC667 (Main Control Room) to prevent an inadvertent trip:

HSS-012-0028, "BID RHRSW Pump RHR Htx Hi Rad Trip Keylock Bypass BID" (B/D) 4.6.4 PLACE RHR Service Water Loop Bin service using B T-225, Rev. 22 Page 20 of 44 RCB:tm OR D RH R Service Water pump per S 12.1.A, RH R Service Water System Startup.

4.6.5 TRIP Reactor Recirc Pumps.

4.6.6 REMOVE Drywell Cooling Fans from service by placing all 16 Drywell Cooler Fan switches to "OFF."

4.6.7 IF Drywell High Pressure AND LOCA signals are present, THEN GO TO step 4.6.10.

4.6.8 IF Drywell High Pressure AND LOCA signals are not present, THEN PERFORM step 4.6.9.

4.6.9

1.
2.
3.
  • UNIT 1 ONLY *
  • PERFORM the following to initiate LOCA signal for B Loop:

PLACE E11A-S61 B, INITIATION, switch for B Loop operation at panel 1 OC601 (Main Control Room) to "ARM."

DEPRESS AND RELEASE E11A-S61 B.

VERIFY LOOP B INJECTION white indicating light Lit.

T-225, Rev. 22 Page 21 of 44 RCB:tm

4.

IF LOOP B INJECTION white indicating light not Lit, THEN INSTALL the following jumpers:

Jumper from EEE2-16 to EEE2-17 at 10C618 Bay B (Aux Equip Room) (ATTACHMENT 3)

Jumper from GGG7-11 to GGG7-12 at 1 OC618 Bay A (Aux Equip Room)

(ATTACHMENT 4)

CAUTION IF a LOCA signal is present AND differential pressure across HV-51-1 F017B, "1 B RHR LPCI lnj PCIV" (OUTBOARD B) drops below 74 psid, THEN injection valve will automatically open AND RHR Service Water will add inventory to the vessel.

4.6.10 OPEN the following RHR Service Water/RHR Emergency Crosstie Valves at 1 OC601 (Main Control Room):

HV-51-1 F073, "RHR Service Water Crosstie" (CROSSTIE)

HV-51-1 F075, "RHR Service Water Crosstie" (CROSSTIE)

4.6.11 4.6.12

  • UNIT 1 ONLY *
  • OPEN HV-51-1F021B, "1B RHR Cntmt Spray Line Inboard PCIV" (INBOARD)

REQUEST SSV verify drywell temperature AND drywell pressure are on SAFE side of Drywell Spray Initiation Limit Curve per T-102, Primary Containment Control OR SAMP-1, RPV and Primary Containment Flooding Control.

NOTE T-225, Rev. 22 Page 22 of 44 RCB:tm Step 4.6.13 will require coordination between an Operator at OOC667 AND a second Operator at 1 OC681.

4.6.13 Simultaneously PERFORM the following to maintain RHR Service Water discharge pressure 75 to 120 psig as indicated on Pl-12-001 B-1 "Pump B/D Disch" (Px), at OOC667 (Main Control Room):

Throttle Fully CLOSED HV-51-1 F068B, "1 B RHR Htx SW Outlet Viv" (1 B) at OOC667 (Main Control Room).

CAUTION Slowly throttling open Outboard Drywell Spray valve will prevent rapid pressure drop.

Throttle Fully OPEN HV-51-1F016B, "1B RHR Cntmt Spray Line Outboard PCIV" (OUTBOARD) to initiate spray AND MAXIMIZE flowrate as indicated on Fl-51-1R603B, FL.

  • UNIT 1 ONLY *
  • 4.6.14 MONITOR Drywell pressure.

4.6.15 IF HV-51-1F017B "1B RHR LPCI lnj PCIV" (OUTBOARD B) opens, THEN REFER TO T-102, Primary Containment

Control, OR SAMP-1 RPV and Primary Containment Flooding Control AND TERMINATE Drywell Spray OR PREVENT LPCI Injection to prevent pump runout as directed.

4.6.16 IF shutdown of LPCI injection is required, THEN PERFORM the following:

1.

WHEN HV-51-1 F017B, "1 B RHR LPCI lnj PCIV" (OUTBOARD B) begins to open, THEN PLACE handswitch to "CLOSE" to energize override feature.

2.

PULL-TO-STOP HV-51-1F017B, OUTBOARD.

3.

CLOSE HV-51-1F017B, OUTBOARD.

4.6.17 WHEN shutdown of Drywell Spray using RHR Service Water is required, THEN PERFORM section 4.12.

T-225, Rev. 22 Page 23 of 44 RCB:tm

  • UNIT 1 ONLY *
  • T-225, Rev. 22 Page 24 of 44 RCB:tm 4.7 INITIATING DRYWELL SPRAY USING FIRE PROTECTION SYSTEM CROSSTIE 4.7.1 ENSURE 1 BP202, "RHR Pump" not running.

4.7.2 ENSURE the following valves closed:

HV-51-1 F004B, "1 B RHR Pump Suction PCIV" (SUCTION B)

HV-51-1 F006B, "1 B RHR Pp S/D Clg Suet lntertie Viv" (SUCTION B)

HV-51-1F015B, "1B Shutdown Clg Injection PCIV" (OUTBOARD)

HV-51-1F016B, "1B RHR Cntmt Spray Line Outboard PCIV" (OUTBOARD)

HV-51-1 F017B, "1 B RHR LPCI lnj PCIV" (OUTBOARD B)

HV-51-1 F024B, "1 B RHR Pp Full Flow Test Return Viv" (SUPP POOL CLG B)

HV-51-1 F027B, "1 B RHR Supp Pool Spray Line PCIV" (SUPP POOL SPRAY)

HV-51-1 F047B, "1 B RHR Htx Shell Side Inlet Viv" (INLET)

HV-C-51-1F048B, "1B RHR Htx Shell Side Bypass Viv" (HEAT EXCH BYPASS) 051-1 F098, "Cond Trans Fill lsol Viv to 1A & 1 B RHR Loops" (402-R11-253) (ATTACHMENT 6)

  • UNIT 1 ONLY *
  • 4.7.3 PERFORM the following in 402-R16-253 (ATTACHMENT 5):
1.

CONNECT hose at 51-1179 "1 B RHR Fire Protection Crosstie Connection Drain Valve" AND Route to drain THEN CYCLE 51-1179 open AND closed to ensure piping vented.

2.

CONNECT hose at 22-1430, "Fire Protection/RHR Interconnection Drain Valve" AND Route to drain THEN CYCLE 22-1430 open AND closed to ensure piping vented.

3.

CONNECT hose to fitting downstream of 22-1429, "Fire Protection/RHR Interconnection Isolation Valve."

4.

CONNECT other end of hose to 51-1178, "1 B RHR Fire Protection Crosstie Connection Isolation Valve."

5.

OPEN 22-1429.

6.

OPEN 51-1178.

4.7.4 REQUEST SSV verify drywell temperature 4.7.5 4.7.6 AND drywell pressure are on SAFE side of Drywell Spray Initiation Limit curve per T-102, Primary Containment Control OR SAMP-1, RPV and Primary Containment Flooding Control.

TRIP Reactor Recirc Pumps.

REMOVE Drywell Cooling Fans from service by placing.fill 16 Drywell Cooler Fan switches to "OFF."

T-225, Rev. 22 Page 25 of 44 RCB:tm

  • UNIT 1 ONLY *
  • 4.7.7 IF Drywell High Pressure AND LOCA signals are present, THEN GO TO step 4.7.10.

4.7.8 IF Drywell High Pressure AND LOCA signals are not present, THEN PERFORM step 4.7.~.

4.7.9 PERFORM the following to initiate LOCA signal for B Loop:

1.

PLACE E11A-S61 B, INITIATION, switch for B Loop operation at panel 1 OC601 (Main Control Room) to "ARM."

2.

DEPRESS AND RELEASE E11A-S61 B.

3.

VERIFY LOOP B INJECTION white indicating light Lit.

T-225, Rev. 22 Page 26 of 44 RCB:tm

4.

IF LOOP B INJECTION white indicating light not Lit, THEN PERFORM the following:

4.7.10 Jumper from EEE2-16 to EEE2-17 at 10C618 Bay B (Aux Equip Room) (ATTACHMENT 3)

Jumper from GGG7-11 to GGG7-12at10C618 Bay A (Aux Equip Room) (ATTACHMENT 4)

OPEN HV-51-1 F021 B, "1 B RHR Cntmt Spray Line Inboard PCIV", (INBOARD)

AND HV-51-1F016B, "1B RHR Cntmt Spray Line Outboard PCIV", (OUTBOARD), at 1 OC601.

  • UNIT 1 ONLY *
  • 4.7.11 ENSURE fire pump running as follows:
1.

IF starting OOP512, "Motor Driven Fire Pump,"

THEN DEPRESS HS-22-002-1 at OOC650 (Main Control Room)

AND VERIFY pump starts.

a.

IF OOP512, "Motor Driven Fire Pump," does not start from OOC650, THEN PERFORM one of the following:

1.

GO TO step 4.7.11.2. to start the diesel driven fire pump from the Main Control Room.

T-225, Rev. 22 Page 27 of 44 RCB:tm

2.

ST ART OOP512, "Motor Driven Fire Pump," from the Circ Water Pump House by depressing HS-22-002-2 at OOC518 AND VERIFY pump starts.

2.

IF starting OOP511, "Diesel Driven Fire Pump,"

THEN DEPRESS HS-22-026-1 at OOC650 (Main Control Room)

AND VERIFY pump is running.

a.

IF OOP511, "Diesel Driven Fire Pump," does not start from OOC650, THEN PERFORM one of the following:

1.

GO TO step 4.7.11.1. to start the motor driven fire pump from the Main Control Room.

  • UNIT 1 ONLY *
  • T-225, Rev. 22 Page 28 of 44 RCB:tm
2.

START OOP511, "Diesel Driven Fire Pump," from the Diesel Fire Pump Room as follows:

a.

PLACE control switch at OOC519 (Diesel Fire Pump Room) in "MANUAL A" AND DEPRESS AND HOLD HS-22-026-2 until diesel starts.

b.

IF diesel did not start, THEN PLACE control switch in "MANUAL B" at OOC519 AND DEPRESS AND HOLD HS-22-026-2 until diesel starts.

c.

VERIFY OOP511, "Diesel Driven Fire Pump," starts.

3.

IF OOP1512, "Motor Driven Fire Pump,"

AND OOP511, "Diesel Driven Fire Pump," are not available, THEN PLACE control switch for 1 OP402, "Backup Diesel Driven Fire Pump," in "TEST at 1 OC096 (Lower Parking Lot Pump Enclosure)

AND VERIFY pump starts.

4.7.12 WHEN shutdown of Fire Protection Crosstie to Drywell Spray required, THEN PERFORM section 4.13.

  • UNIT 1 ONLY *
  • T-225, Rev. 22 Page 29 of 44 RCB:tm 4.8 SHUTDOWN OF SUPPRESSION POOL SPRAY USING RHR 4.8.1 WHEN shut down of Suppression Pool Spray using RHR is required, THEN PERFORM the following:
1.

CLOSE HV-51-1 F027A(B), "1A(B) RHR Supp Pool Spray Line PCIV" (SUPP POOL SPRAY).

2.

OPEN HV-C-51-1 F048A(B), "1A(B) RHR Htx Shell Side Bypass Viv" (HEAT EXCH BYPASS).

3.

CLOSE HV-51-1F024A(B), "1A(B) RHR Pp Full Flow Test Return Viv" (SUPP POOL CLG A(B)).

4.

IF RHR Pump operation not required for other modes of RHR operation, THEN SHUT DOWN 1A(B)P202, "RHR Pump" (PUMP).

5.

IF RHR Service Water Pump operation not required for other modes of RHR operation, THEN SHUT DOWN RHR Service Water per S12.2.A, Shutdown Of RHR Service Water Pumps And System.

  • UNIT 1 ONLY *
  • T-225, Rev. 22 Page 30 of 44 RCB:tm 4.9 SHUTDOWN OF SUPPRESSION POOL SPRAY USING RHR SERVICE WATER 4.9.1 WHEN shut down of Suppression Pool Spray using RHR Service Water is required, THEN PERFORM the following:

NOTE Step 4.9.1.1 will require coordination between an Operator at OOC667 AND a second Operator at 1 OC601.

1.

Simultaneously PERFORM the following AND maintain RHR Service Water discharge pressure 75 to 120 psig as indicated on Pl-12-001 B, "Pump A/C Disch" (Px), at OOC667 (Main Control Room):

Throttle OPEN HV-51-1 F068B, "1 B RHR Htx SW Outlet Viv" (1 B) at OOC667 (Main Control Room).

Throttle CLOSED HV-51-1F027B, "1B RHR Supp Pool Spray Line PCIV" (SUPP POOL SPRAY) at 1 OC601 (Main Control Room).

2.

CLOSE the following RHR Service Water/RHR Emergency Crosstie Valves at 1 OC601 (Main Control Room):

HV-51-1 F073, "RHR Service Water Crosstie" (CROSSTIE)

HV-51-1 F075, "RHR Service Water Crosstie" (CROSSTIE)

3.

SECURE RHRSW pump per S12.2.A, Shutdown of RHR Service Water Pumps And System.

4.

RETURN HSS-012-002B, "BID RHRSW Pump RHR Htx High Rad Trip Keylock Bypass B/D" (BID) to "NORMAL" at OOC667 (Main Control Room)

  • UNIT 1 ONLY *
  • 4.10 SHUTDOWN OF SUPPRESSION POOL SPRAY USING FIRE PROTECTION CROSSTIE 4.10.1 CLOSE HV-51-1F027B "18 RHR Supp Pool Spray Line PCIV" (SUPP POOL SPRAY) at 1 OC601.

4.10.2 IF this Suppression Pool Spray Mode is no longer required AND temporary hose hookup is to be removed THEN GO TO Section 5.0 (step 5.3)

Otherwise LEAVE hose attached for future use.

T-225, Rev. 22 Page 31 of 44 RCB:tm

  • UNIT 1 ONLY *
  • 4.11 SHUTDOWN OF DRYWELL SPRAY USING RHR T-225, Rev. 22 Page 32 of 44 RCB:tm 4.11.1 Throttle OPEN HV-51-1 F024A(B), "1A(B) RHR Pp Full Flow Test Return Viv" (SUPP POOL CLG A(B)),

AND throttle CLOSED HV-51-1 F016A(B), "1A(B)

RHR Cntmt Spray Line Outboard PCIV" (OUTBOARD), to maintain total system flow of 8,000 to 11,000 gpm.

4.11.2 WHEN shut down of Drywell Spray using RHR is

required, THEN PERFORM the following:
1.

ENSURE HV-51-1 F016A(B), "1A(B) RHR Cntmt Spray Line Outboard PCIV" (OUTBOARD), closed.

2.

CLOSE HV-51-1F021A(B), "1A(B) RHR Cntmt Spray Line Inboard PCIV" (INBOARD).

3.

OPEN HV-C-51-1 F048A(B),"1A(B) RHR Htx Shell Side Bypass Viv" (HEAT EXCH BYPASS).

4.

CLOSE HV-51-1 F024A(B), "1A(B) RHR Pp Full Flow Test Return Viv" (SUPP POOL CLG A(B)).

5.

IF RHR Pump operation not required for other modes of RHR operation, THEN SHUT DOWN 1A(B)P202, "RHR Pump" (PUMP).

6.

IF RHR Service Water Pump operation not required for other modes of RH R operation, THEN SHUT DOWN RHR Service Water per S12.2.A, Shutdown Of RHR Service Water Pumps And System.

  • UNIT 1 ONLY *
required, THEN PERFORM the following:

NOTE Step 4.12.1.1 will require coordination between an Operator at OOC667 AND a second Operator at 1 OC601.

1.

Simultaneously PERFORM the following AND maintain RHR Service Water discharge pressure 75 to 120 psig as indicated on Pl-12-001 B, "Pump BID Disch" (Px), at OOC667 (Main Control Room):

Throttle OPEN HV-51-1 F068B, "1 B RHR Htx SW Outlet Viv" (1 B) at OOC667 (Main Control Room).

CLOSE HV-51-1 F016B, "1 B RHR Cntmt Spray Line Outboard PCIV" (OUTBOARD) at 1 OC601 (Main Control Room).

CLOSE HV-51-1 F021 B, "1 B RHR Cntmt Spray Line Inboard PCIV" (INBOARD) at 1 OC601 (Main Control Room).

2.

CLOSE the following RHR Service Water/RHR Emergency Crosstie Valves at 1 OC601 (Main Control Room):

HV-51-1 F073, "RHR Service Water Crosstie" (CROSSTIE)

HV-51-1 F075, "RHR Service Water Crosstie" (CROSSTIE)

  • UNIT 1 ONLY *
  • T-225, Rev. 22 Page 34 of 44 RCB:tm
3.

SECURE RHR Service Water pump per S12.2.A, Shutdown of RHR Service Water Pumps And System.

4.

RETURN HSS-012-002B, "BID RHRSW Pump RHR Htx High Rad Trip Keylock Bypass B/D" (BID) to "NORMAL" at OOC667 (Main Control Room) 4.13 SHUTDOWN OF DRYWELL SPRAY USING FIRE PROTECTION CROSSTIE 4.13.1 CLOSE HV-51-1F016B, "1B RHR Cntmt Spray Line Outboard PCIV", (OUTBOARD),

AND HV-51-1 F021 B,"1 B RHR Cntmt Spray Line Inboard PCIV", (INBOARD) at 10C601.

4.13.2 IF this Drywell Spray Mode is !!Q longer required AND temporary hose hookup is to be removed THEN GO TO Section 5.0 (step 5.3)

Otherwise LEAVE hose attached for future use.

5.0

  • UNIT 1 ONLY *
  • T-225, Rev. 22 Page 35 of 44 RCB:tm RETURN TO NORMAL 5.1 5.2 5.3 IF step 4.5.9.4 was performed, THEN REMOVE the following jumpers:
  • Jumper from FFF5-7 to FFF5-6 in 10C617,Bay A
  • Jumper from FFF9-2 to FFF9-1in10C617, Bay B IF step 4.4.6.4., 4.6.9.4 OR 4.7.9.4 was performed, THEN REMOVE the following jumpers:
  • Jumper from EEE2-16 to EEE2-17 in 10C618,Bay B.
  • Jumper from GGG7-11 to GGG7-12 in 10C618, Bay A IF section 4.4 OR 4. 7 was completed THEN PERFORM the following:

5.3.1 CLOSE 51-1178, "1 B RHR Fire Protection Crosstie Connection Isolation Valve,"

AND 22-1429, "Fire Protection/RHR Interconnection Isolation Viv" IV IV IV IV IV

5.3.2 5.3.3 5.3.4

  • UNIT 1 ONLY *
  • ENSURE hoses connected AND OPEN the following:

T-225, Rev. 22 Page 36 of 44 RCB:tm

  • 51-1179, "1 B RHR Fire Protection Crosstie Drain Valve".

IV

  • 22-1430, "Fire Protection/RHR Interconnection Drain Viv".

IV CLOSE valves, REMOVE hoses, AND INSTALL cap on the following:

  • 22-1430, "Fire Protection/RHR Interconnection Drain Viv" IV
  • 51-1179, "1 B RHR Fire Protection Crosstie Drain Valve" IV DISCONNECT AND RETURN hoses to T-225/T-244 Hose Storage Locker IV
  • UNIT 1 ONLY *
  • NOTE Fire pumps can only be secured at local panels.

5.4 IF OOP512, "Motor Driven Fire Pump" was started, T-225, Rev. 22 Page 37 of 44 RCB:tm THEN SECURE OOP512 at OOC518 (Circulating Water Pump House).

5.5 IF OOP511, "Diesel Driven Fire Pump" was started, THEN SECURE OOP511 at OOC519 (Diesel Fire Pump Room).

5.6 IF 1 OP402, "Backup Diesel Driven Fire Pump" was started, THEN SECURE 1 OP402 at 1 OC096 (Lower Parking Lot Pump Enclosure).

5. 7 IF Section 4.3, 4.4, 4.6 OR 4. 7 was performed THEN OPEN the following valves:

HV-51-1 F047B, "1 B RHR Htx Shell Side Inlet Viv" (INLET)

HV-C-51-1 F048B, "1 B RHR Htx Shell Side Bypass Viv" (HEAT EXCH BYPASS) 051-1F098, "Cond Trans Fill lsol Viv to 1A & 1B RHR Loops" IV IV IV IV IV IV

  • UNIT 1 ONLY *
  • 5.8 ENSURE T-225 equipment returned to the following T-200 cabinets:

Unit 1 T-200 cabinet in OSC Unit 1 T-225/T-244 Hose Storage Locker (402-R16-253) 5.9 FORWARD completed copy to Manager, Operations Support for document retention.

T-225, Rev. 22 Page 38 of 44 RCB:tm IV IV

  • *UNIT 1 ONLY*

ATTACHMENT 1 (Page 1 of 1)

Panel 10C617. Bay A (AUX EQUIPMENT ROOM)

T-225, Rev. 22 Page 39 of 44 NOTE: Contacts to be jumpered have lavender banana jacks installed.

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  • UNIT 1 ONLY *
  • ATTACHMENT 2 (Page 1 of 1)

Panel 10C617. Bay B (AUX EQUIPMENT ROOM)

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I T-225, Rev. 22 Page 40 of 44 I

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  • UNIT 1 ONLY *
  • ATTACHMENT 3 (Page 1 of 1)

Panel 1 OC618. Bay B (AUX EQUIPMENT ROOM)

T-225, Rev. 22 Page 41 of 44 NOTE: Contacts to be jumpered have lavender banana jacks installed.

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  • UNIT 1 ONLY *
  • ATTACHMENT 4 (Page 1 of 1)

Panel 10C618. Bay A (AUX EQUIPMENT ROOM)

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EXELON GENERATION LIMERICK GENERATING STATION S12.1.A, Rev. 53 Page 1 of 15 RCB:tm 512.1.A RHR SERVICE WATER SYSTEM STARTUP 1.0 PURPOSE Align RHR Service Water System for standby OR manual startup.

2.0 PREREQUISITES 2.1 Correct revision of procedure being used.

2.2 Procedure printed on white paper.

2.3 Spray Pond Pump Structure HVAC system available.

OR precautionary measures taken to maintain SPPH temperatures between 40 ° F AND 115°F.

2.4 System lined up per OS12.1.A (COL-1,(2)), Alignment for Normal Operation of the Residual Heat Removal Service Water System -

Loop A(B).

2.5 System aligned to the Cooling Tower OR the Spray Pond as the heat sink per S12.7.B, Utilization of Cooling Tower Or Spray Pond As a Heat Sink For RHRSW And ESW.

2.6 RHRSW Radiation Monitors in service per S26.1.0, Placing the RHR Service Water Radiation Monitors in Service OR required actions of ODCM Part 1 Control 3.1.1 have been met for the INOPERABLE RHRSW Radiation Monitor.

2.7 RHR Heat Exchanger shell side filled.

2.8 RHRSW piping verified to be filled AND vented.

2.9 Briefing performed as required.

S12.1.A, Rev. 53 Page 2 of 15 PLACEKEEP/INITIALS 3.0 PRECAUTIONS 3.1 For either RHRSW loop, only one of the following heat sinks may be used as a source of water at a time:

Spray Pond OR Associated Cooling Tower 3.2 IF RHRSW loops are aligned to different water sources, THEN HV-012-005, PIT X-CONN GATE, must be closed.

3.3 Spray headers must be drained within one hour after use.

3.4 Starting an RHRSW Pump more than twice in one hour may result in damage to the pump motor.

3.5 IF HV-51-*F068A(B), HEAT EXCHANGER OUTLET, is throttled closed more than 85%,

THEN valve may be damaged, the RHRSW pump may trip on high pressure AND RHR HX LOOP A(B) VALVES NOT OPEN annunciator will alarm.

3.6 Operation of more than one RHRSW Pump in a loop with only one heat exchanger in service in that loop would result in excessive flow AND may result in damage to components.

3. 7 Operation of 2 RHRSW Heat Exchangers in a loop with only one pump in service may result in pump runout.

3.8 IF HV-51-*F068A(B) is allowed to go full open during one pump per loop operation, THEN RHRSW pump runout may occur.

3.9 Placing HSS-12-002A(B), PUMP TRIP BYPASS, in "BYPASS" position will bypass HI RAD AND HI pump discharge pressure trips associated with the RHRSW pump.

3.10 Starting a RHRSW pump could move voids in the piping to the system radiation monitors, causing a monitor low flow alarm.

IF this occurs, THEN manual venting of the rad monitor sensing lines is required.

3.11 WHEN running 2 ESW Pumps S12.1.A, Rev. 53 Page 3 of 15 PLACEKEEP/INITIALS AND at least one RHRSW Pump from the same offsite power source, in the same loop THEN ESW flow in that loop must remain> 4,000 gpm. (Ref. 5.7) 3.12 IF the diesel generator is supplying the safeguard bus, THEN the following Manufactures ratings for Diesel Generator shall not be violated:

2850 KW continuous 3100 KW 2000 hours0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> 3100 KW 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> in 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> 3135 KW 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> in 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> 3250 KW 300 hours0.00347 days <br />0.0833 hours <br />4.960317e-4 weeks <br />1.1415e-4 months <br /> 3500 KW 30 minutes (full rack) 3.13 To ensure adequate heat rejection at the spray networks during LOCA OR Loop conditions, limit the number of spray networks in a loop in service to equal the number of operating RHRSW pumps in the loop.

3.14 RHRSW system operation in spray should be minimized.

IF an operating RHRSW pump is IlQ. longer supporting a plant function (test, chemical treatment or cooling) during normal plant operation, THEN the pump should be secured as soon as possible. (Ref. 5.13)

S12.1.A, Rev. 53 Page 4 of 15 PLACEKEEP/INITIALS 4.0 PROCEDURE NOTE

1. Conditional IF... THEN steps that are not applicable AND steps to be skipped per direction of the IF... THEN step shall be marked NIA AND initialed.
2. The procedure "Hard Card", S12.1.AAppendix 1, "RHR Service Water System Startup Hard Card", may be used for transient response.

4.1 PREPARATION FOR STARTUP 4.1.1 VERIFY all prerequisites satisfied.

4.1.2 VERIFY procedure being performed on correct unit/ train.

4.1.3 ENSURE RHRSW Spray Header Drain Valves on the spray headers to be placed in service closed per S12.4.A.

NOTE Steps 4.1.4 AND 4.1.5 may be performed at the same time.

4.1.4 OPEN HV-51-*F014A(B), HEAT EXCHANGER INLET.

4.1.5 Throttle OPEN HV-51-*F068A(B) for 18 to 20 seconds OR Perform the following to manually OPEN HV-51-*F068A(B):

1. OPEN the power supply for HV-51-*F068A(B) (0*34-R-H-19 breaker for HV-51-*F068A OR 0*44-R-H-19 breaker for HV-51-*F068B)
2. Manually OPEN HV-51-*F068A(B) approximately 150 turns p

512.1.A, Rev. 53 Page 5 of 15 PLACEKEEP/INITIALS "A" RHRSW ONLY 4.1.6 IF the associated RHR Heat Exchanger has been drained OR maintenance has been performed on the associated RHR Heat Exchanger, THEN VERIFY Pl-51-*05A-1, HX DISCH, indicates system static pressure greater than or equal to 15 psig.

1.

IF Pl-51-*05A -1, HX DISCH, indicates system static pressure less than 15 psig, THEN FILL system per section 4.3.

118 11 RHRSW ONLY 4.1. 7 IF the associated RHR Heat Exchanger has been drained OR maintenance has been performed on the associated RHR Heat Exchanger, THEN VERIFY Pl-51-*05B, HX DISCH, indicates system static pressure greater than OR equal to 15 psig.

1.

IF Pl-51-*05B, HX DISCH, indicates system static pressure less than 15 psig, THEN FILL system per section 4.4.

4.1.8 IF the HI RAD AND/OR HI Pump Discharge pressure trips need to be bypassed AND the required actions of ODCM Part 1 Control 3.1.1 have been met for the INOPERABLE RHRSW Radiation Monitor, THEN PLACE HSS-12-002A(B), PUMP TRIP BYPASS, in "BYPASS."

S12.1.A, Rev. 53 Page 6 of 15 PLACEKEEP/INITIALS 4.2 MANUAL START OF RHRSW CAUTION

1.

IF (*A) HV-51-*F068A(B) is allowed to go full open during one pump per loop operation THEN runout of RHRSW Pump may occur.

[

]

2.

Starting a pump more than twice in one hour may damage pump motor.

[

)

1.
2.

4.2.1 START OA(B,C,D)V543, Spray Pond Room Fan as follows:

1.

IF 'A' Loop pump (OA(C)-P506) is to be placed in service, THEN ENSURE OA-V543 OR OC-V543, Spray Pond Pump Room Fans, in "RUN" at OOC681.

2.

IF 'B' Loop pump (OB(D)-P506) is to be placed in service, THEN ENSURE OB-V543 OR OD-V543, Spray Pond Pump Room Fans, in "RUN" at OOC681.

CAUTION

!f HV-51-*F068A(B) throttled more than 85% closed, THEN valve may be damaged AND RHR HX LOOP A(B) VALVES NOT OPEN annunciator will alarm.

HV-51-*F068A(B) position is maximized to avoid cavitation.

4.2.2 4.2.3 START OA(B,C,D)P506, PUMP.

IF not directed by SE-10 to operate RHRSW, THEN THROTTLE HV-51-*F068A(B) to the maximum obtainable position without exceeding 11,000 gpm on Fl-51-*R602A(B) while maintaining pump disch pressure (Pl-12-001A-1 (B)) between 75 psig to 85 psig.

[

]

[ ]

512.1.A, Rev. 53 Page 7 of 15 PLACEKEEP /INITIALS 4.2.4 IF directed by SE-10 to operate RHRSW THEN perform the following (Ref. 5.12):

1.

IF Spray Pond level ~ 245 ft 4" THEN THROTTLE HV-51-*F068A(B) to the maximum obtainable position without exceeding 11,000 gpm on Fl-51-*R602A(B) while maintaining pump disch pressure (Pl-12-001A-1(B)) between 75 psig to 85 psig.

2.

IF spray pond level < 245 ft 4" THEN THROTTLE HV-51-*F068A(B) to the maximum obtainable position without exceeding 10,700 gpm on Fl-51-*R602A(B) while maintaining pump disch pressure (Pl-12-001A-1(B)) between 75 psig to 85 psig.

4.2.5 IF a second pump in the loop is being started to shutdown the other unit during a LOCA mitigation, THEN ADJUST flows as follows:

The accident unit receives a minimum 8,250 gpm The unit being shutdown receives a minimum 5,750 gpm.

Combined Loop flow no greater than 14,500 gpm.

4.2.6 IF idle RHRSW loop A(B) pump is not to be started, THEN GO TO step 4.2.12.

4.2.7 OPEN idle Heat Exchanger inlet HV-51-*F014A(B).

S12.1.A, Rev. 53 Page 8 of 15 PLACEKEEP/INITIALS

1.

NOTE Steps 4.2.8 through 4.2.11 must be performed quickly to avoid high flow rates through the RHR Heat Exchanger.

2.

IF discharge pressure exceeds 140 psig for greater than 5 seconds THEN an in-service pump will trip.

3.

IF discharge pressure drops below 73 psig for greater than 10 seconds THEN the pump discharge low pressure annunciator will alarm. This alarm will not clear until pressure is raised above 100 psig OR until pump is removed from service.

4.2.8 THROTTLE closed in-service HV-51-*F068A(B)

AND THROTTLE open idle HV-51-*F068A(B) until heat exchanger flows are approximately the same ensuring pump discharge pressure remains between 75 to 120 psig.

4.2.9 ENSURE pump discharge pressure is 75 to 80 psig prior to pump start.

4.2.10 ST ART idle RHRSW Pump in the loop.

4.2.11 Throttle OPEN HV-51-1 F068A(B)

AND HV-51-2F068A(B) to maximum positions that obtain desired flows (15,000 to 18,000 gpm) through both heat exchangers with pump discharge pressure greater than 75 psig.

[

0 0

S12.1.A, Rev. 53 Page 9 of 15 PLACEKEEP/INITIALS NOTE During non-accident conditions, Loop RHRSW flow rates should be maximized in order to prevent excessive cavitation at the heat exchanger outlet valves (see limits in step 4.2.12).

4.2.12 VERIFY the following:

Pump motor current is less than 92 amps on A/11503-2(11603-2).

Pump discharge pressure(s) is greater than 75 psig on Pl-12-001A-1 (B).

Steady state pump discharge pressure(s) does not exceed 120 psig.

4.2.13 NOTIFY chemistry that RHRSW is in operation. (Ref. 5.10)

CAUTION The following step ensures the ESW & RHRSW systems are capable of removing design heat loads. Failure to align the systems in accordance with the guidance provided may result in over-heating vital safety related components.

[

1 4.2.14 PERFORM the following to minimize Spray Pond Temperature. (Ref 5.8 and 5.9)

1.

IF Spray Pond is not frozen solid, THEN PLACE the same number of spray networks in service in each RHRSW loop as running RHRSW pumps by performing next step.

4.2.15 IF it is desired to transfer spray mode from "Spray to Bypass" OR "Bypass to Spray" THEN PERFORM necessary steps per S12.7.A, Spray Networks To Bypass Transfer, OR S12.7.E, Bypass To Spray Networks Transfer, respectively.

4.2.6 IF 0*34-R-H-19 breaker OR 0*44-R-H-19 breaker was opened and it is desired to energize HV-051-*F068A(B),

THEN close the associated supply breaker.

S12.1.A, Rev. 53 Page 10 of 15 PLACEKEEP/INITIALS 4.3 FILLING OF RHR SERVICE WATER LOOP A USING A ESW 4.3.1 OPEN the following valves:

HV-51-1 F014A, "RHR Heat Exchanger SW Inlet Valve".

IPCI HV-51-2F014A, "RHR Heat Exchanger SW Inlet Valve".

IPCI 4.3.2 OPEN the following valves:

  • HV-51-1 F068A, "RHR Heat Exchanger SW Outlet Valve".

IPCI

  • HV-51-2F068A, "RHR Heat Exchanger SW Outlet Valve".

rPCI 4.3.3 CLOSE HV-11-015A, "ESW A Discharge To B RHR Service Water Return."

rPCI 4.3.4 START ESW pump OA(C)P548 per S11.1.A, ESW System Startup.

4.3.5 WHEN approximately 30 minutes of ESW operation has

elapsed, CJ OR venting is complete, THEN SECURE ESW pump OA(C)P548 per S11.2.A, Emergency Service Water System Shutdown.

4.3.6 VERIFY Pl-51-*05A-1 indicates system static pressure greater than 15 psig OR REPEAT this section (4.3)

Otherwise, CONTINUE.

4.3.7 OPEN HV-11-015A, "ESW A Discharge To B RHR Service Water Return".

rPCI

4.3.8 CLOSE the following valves:

S12.1.A, Rev. 53 Page 11 of 15 PLACEKEEP/INITIALS HV-51-1 F068A, "RHR Heat Exchanger SW Outlet Valve".

HV-51-2F068A, "RHR Heat Exchanger SW Outlet Valve".

4.3.9 CLOSE the following valves:

HV-51-1 F014A, "RHR Heat Exchanger SW Outlet Valve".

HV-51-2F014A, "RHR Heat Exchanger SW Outlet Valve".

4.3.10 FLUSH RHR Heat Exchanger not being placed in service per S51.5.A, "Flushing of the RHR System Heat Exchanger Tube Side With Demineralized Water."

4.4 512.1.A, Rev. 53 Page 12 of 15 PLACEKEEP /INITIALS FILLING OF RHR SERVICE WATER LOOP BUSING B ESW 4.4.1 OPEN the following valves:

  • HV-51-1 F014B, "RHR Heat Exchanger SW Outlet Valve".

IPCI

  • HV-51-2F014B, "RHR Heat Exchanger SW Outlet Valve".

IPCI 4.4.2 OPEN the following valves:

HV-51-1 F068B, "RHR Heat Exchanger SW Outlet Valve".

IPCI HV-51-2F068B, "RHR Heat Exchanger SW Outlet Valve".

IPCI 4.4.3 CLOSE HV-11-011 B, "ESW B Discharge To A RHR Service Water Return."

IPCI 4.4.4 START ESW pump OB(D)P548 per S11.1.A, ESW System Startup.

4.4.5 WHEN approximately 30 minutes of ESW operation has

elapsed, C9 OR venting is complete, THEN SECURE the ESW pump OB(D)P548 per S11.2.A, Emergency Service Water System Shutdown.

4.4.6 VERIFY Pl-51-*058 indicates system static pressure greater than 15 psig OR REPEAT this section (4.4)

Otherwise, CONTINUE.

4.4.7 OPEN HV-11-011 B, "ESW B Discharge To A RHR Service Water Return".

~

4.4.8 CLOSE the following valves:

S12.1.A, Rev. 53 Page 13 of 15 PLACEKEEP /INITIALS HV-51-1 F068B, "RHR Heat Exchanger SW Outlet Valve".

HV-51-2F068B, "RHR Heat Exchanger SW Outlet Valve".

4.4.9 CLOSE the following valves:

HV-51-1 F014B, "RHR Heat Exchanger SW Outlet Valve".

HV-51-2F014B, "RHR Heat Exchanger SW Outlet Valve".

4.4.10 FLUSH RHR Heat Exchanger not being placed in service per S51.5.A, "Flushing of the RHR System Heat Exchanger Tube Side With Demineralized Water."

5.0 REFERENCES

5.1 M-12, P&ID - RHR Service Water 5.2 M-51, P&ID - Residual Heat Removal S12.1.A, Rev. 52 Page 14 of 15 5.3 SFR 216A-013, RHRSW Flow Requirements for 2 RHRSW Pumps Operating in a Single Loop 5.4 BLP-47794, PCI 20929, RHRSW Pressure Switch Problem 5.5 BLP-48161, Letter from R. J. Scholz to P. J. Duca, June 6, 1989 5.6 L. B. Pyrih letter to M. J. McCormick, Jr., dated June 27, 1990, LGS Diesel Generator Loading Limitations 5.7 BLP-44743 ESW/RHRSW System Transient Testing, Final Report 5.8 Limerick Spray Pond Heat Removal Calculation LM-350 5.9 Limerick Spray Pond Heat Removal Calculation LM-383 5.10 IR 241773 5.11 ECR 04-00433

5. 12 Op Eval 11-007 5.13 IR 1346780 6.0 TECHNICAL SPECIFICATIONS 6.1 3.7.1.1 6.2 3.7.1.2

7.0 INTERFACING PROCEDURES 7.1 S11.1.A, ESW System Startup 7.2 S11.2.A, Emergency Service Water System Shutdown 7.3 S12.1.A Appendix 1, RHR Service Water System Startup Hard Card 512.1.A, Rev. 52 Page 15 of 15 7.4 OS12.1.A (COL01 ), Alignment for Normal Operation of the Residual Heat Removal Service Water System - Loop A 7.5 OS12.1.A (COL02), Alignment for Normal Operation of the Residual Heat Removal Service Water System - Loop B 7.6 S12.4.A, Draining of the RHR Service Water Spray Header 7.7 S12.7.A, Spray Networks To Bypass Transfer 7.8 S12.7.B, Utilization of Cooling Tower Or Spray Pond as a Heat Sink for RHRSW And ESW 7.9 S12.7.E, Bypass To Spray Networks Transfer 7.10 S26.1.0, Placing the RHR Service Water Radiation Monitors in Service 7.11 S51.1.A, Set Up of RHR System for Automatic Operation in LPCI Mode 7.12 S51.5.A, Flushing of the RHR System Heat Exchanger Tube Side With Demineralized Water.

7.13 S81.1.A, Startup of Miscellaneous Structure HVAC System 7.14 T-231 U/1, RHRSW to Suppression Pool 7.15 T-231 U/2, RHRSW to Suppression Pool 7.16 T-243 U/1, Alternate Injection By Way of RHRSW to RHR Loop A 7.17 T-243 U/2, Alternate Injection By Way of RHRSW to RHR Loop B 7.18 ST-6-012-620-0, RHRSW Spray Network Draining

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