ML24005A114

Recommendation for 2023-301 Cr/Sim 3 (Emergency Depress the Reactor Using Main Steam Line Drains)

ML24005A114
Person / Time
Site:	Hatch
Issue date:	01/05/2024
From:	Ball A Southern Nuclear Operating Co
To:	NRC/RGN-II
References
2023-301 CR-SIM 3
Download: ML24005A114 (1)

Text

Recommendation for 2023-301 CR/SIM 3 (Emergency Depress the Reactor Using Main Steam Line Drains)

Change step 3 of JPM CR/SIM 3 from a CRITICAL step to a NON-CRITICAL step and update remainder of JPM to reflect this change. After doing so, there will be three CRITICAL steps remaining in the JPM. Updated JPM is included in this package.

Reasoning:

Step 3 of the JPM corresponds to step 3.7.2 of 31EO-EOP-108-2, ALTERNATE RPV DEPRESSURIZATION.

This step provides equipment protection to the Main Condenser by breaking condenser vacuum and does not impact the operators ability to lower reactor pressure with the Main Steam Line Drains. In addition, this step is redundant to the two rupture diaphragms on the turbine exhaust.

See excerpt from the Hatch FSAR:

Should the control, bypass, or turbine stop valves fail to close on loss of condenser vacuum, two rupture diaphragms on each turbine exhaust to the condenser to protect the condenser and turbine exhaust hoods against overpressure. HNP-2-FSAR-10 10.4.1.2 Main Condenser System Description The operator can still perform an Alternate RPV Depressurization using the Main Steam Line Drains without breaking condenser vacuum; therefore, this step should be categorized as NON-CRITICAL.

Actions:

CR# 11030719 was written on 12/11/23 to create two separate steps out of 3.7.2. First to ENSURE Turbine Building HVAC in service and second to ENSURE Main Condenser Vacuum Breaker Valves are OPEN.

In the initial conditions the applicants were told that Turbine Building HVAC was service. The applicants might have assumed that since Turbine Building HVAC was already in service that the Main Condenser Vacuum Breaker Valves had already been opened since these actions are contained in the same step.

ML24005A114

Southern Nuclear Company Operations Training Job Performance Measure (JPM)

FINAL CR/SIM 3 (ALL)

Title:

EMERGENCY DEPRESS THE REACTOR USING MAIN STEAM LINE DRAINS Version:

0.1 Author

Anthony Ball Media Number:

2023-301 CR-SIM 3 Time:

10.0 Minutes Line Technical Review By (N/A for minor revisions)

N/A Date:

N/A Reviewed by Instructional Technologist or designee (N/A for minor revisions)

N/A Date:

N/A Approved By (Training Program Manager or Lead Instructor)

Charlie Edmund Date:

10/30/2023

2023-301 CR-SIM 3 Page 1 of 14 Course Number N/A Program Name OPERATIONS TRAINING Media Number 2023-301 CR-SIM 3 Ver. No.

Date Reason for Revision Author Print Initials/Name Peer Review Print Initials/Name 0.1 10/30/23 Updated to current procedure for use on ILT-15 NRC Exam as CR-SIM 3.

ARB Anthony Ball JDW Derek Williams

2023-301 CR-SIM 3 Page 3 of 14 UNIT 1

( )

UNIT 2 (X)

TASK TITLE:

EMERGENCY DEPRESS THE REACTOR USING MAIN STEAM LINE DRAINS JPM NUMBER:

2023-301 CR-SIM 3 TASK STANDARD:

The task shall be completed when the Main Steam Line Drains have been manually lined up to emergency depress the Reactor per 31EO-EOP-108-2 with an increase in the rate of RPV pressure reduction.

TASK NUMBER:

014.016 OBJECTIVE NUMBER: 014.016.A K/A CATALOG NUMBER: 295025EA1.01 K/A CATALOG JTA IMPORTANCE RATING:

3.1 OPERATOR APPLICABILITY: Nuclear Plant Operator (NPO)

GENERAL

REFERENCES:

Unit 2 31EO-EOP-108-2 (Ver 5.15)

REQUIRED MATERIALS:

Unit 2 31EO-EOP-108-2 (Ver 5.15)

APPROXIMATE COMPLETION TIME: 10.0 Minutes SIMULATOR SETUP: REFER TO SIMULATOR SETUP SHEET ON THE FOLLOWING PAGE

2023-301 CR-SIM 3 Page 4 of 14 SIMULATOR A SETUP Simulator Initial Conditions:

1.

RESET the Simulator to one of the following:

• IC #113 (100%), and then go to step 2

• SNAP 613 and then go to step 4 and leave in FREEZE.

2.

INSERT the following or RUN SCENARIO FILE 2023 CR-SIM 1 (if available)

3.

RESET the Simulator to IC #113 (100%) or SNAP 613 and leave in FREEZE.

4.

TAKE the Simulator OUT OF FREEZE and PERFORM the following MANIPULATIONS:

A. Perform RC-1, RC-2, and TC-1 and restore RWL to the normal band.

B. Place the HPCI Aux Oil Pump in Pull-to-Lock.

C. Close the MSIVs.

D. Lower Torus Water level to approximately 115 inches using svoT48140, then MODIFY to SIMULATOR VALUE OVERRIDES (SVO)value.

E. Trip BOTH Circ Water Pumps.

F. BREAK Condenser Vacuum by opening 2N22-F002A & 2B until Condenser Vacuum is <10 in. Hg. then RECLOSE 2N22-F002A & 2B.

G. RESET Group 1 Isolations on P601 & P602 Panels.

H. Ensure Turbine Building Ventilation is in service.

I. Acknowledge annunciators.

5.

RUN SCENARIO FILE and EVENT TRIGGER 2023-CR-SIM 3 or perform the following steps 4-7.

6.

INSERT the following MALFUNCTIONS:

MALF #

TITLE FINAL VALUE RAMP RATE DELAY mfB21_129A Main Steam Relief Valve A Fails Stuck 1

00000 mfB21_129B Main Steam Relief Valve B Fails Stuck 1

00000 mfB21_129C Main Steam Relief Valve C Fails Stuck 1

00000 mfB21_129D Main Steam Relief Valve D Fails Stuck 1

00000 mfB21_129E Main Steam Relief Valve E Fails Stuck 1

00000 mfB21_129F Main Steam Relief Valve F Fails Stuck 1

00000 mfB21_129G Main Steam Relief Valve G Fails Stuck 1

00000 mfB21_129H Main Steam Relief Valve H Fails Stuck 1

00000

2023-301 CR-SIM 3 Page 5 of 14 mfB21_129K Main Steam Relief Valve K Fails Stuck 1

00000 mfB21_129M Main Steam Relief Valve M Fails Stuck 1

00000

7.

INSERT the following SIMULATOR VALUE OVERRIDES (SVO):

Activator SVO #

DESCRIPTION FINAL VALUE RAMP RATE DELAY ST-0 svoT48140 Water Level in Torus 75 1

0000

8.

INSERT the following REMOTE FUNCTIONS:

Activator REM #

DESCRIPTION STATUS ST-0 rfN61_134 Condenser Vacuum Bypass BYPASS ST-0 rfC71279 Group 1 Isolation Oride Jumpers ORIDE

9.

INSERT the following ORS OVERRIDES:

Activator TAG #

S/M/L DESCRIPTION FINAL VALUE RAMP RATE DELAY ST-0 diB21-F022A S

Main Steam Line Isol Vlv A CLOSE (0) 0000 ST-0 diB21-F022B S

Main Steam Line Isol Vlv B CLOSE (0) 0000 ST-0 diB21-F022C S

Main Steam Line Isol Vlv C CLOSE (0) 0000 ST-0 diB21-F022D S

Main Steam Line Isol Vlv D CLOSE (0) 0000 ST-0 diB21-F028A S

Main Steam Line Isol Vlv A CLOSE (0) 0000 ST-0 diB21-F028B S

Main Steam Line Isol Vlv B CLOSE (0) 0000 ST-0 diB21-F028C S

Main Steam Line Isol Vlv C CLOSE (0) 0000 ST-0 diB21-F028D S

Main Steam Line Isol Vlv D CLOSE (0) 0000

10. PLACE the Simulator in FREEZE until the INITIATING CUE is given.

11. ESTIMATED Simulator A SETUP TIME:

5 Minutes

2023-301 CR-SIM 3 Page 6 of 14 SIMULATOR B SETUP Simulator Initial Conditions:

1.

RESET the Simulator to IC #113 (100%) or SNAP 310 and leave in FREEZE.

2.

TAKE the Simulator OUT OF FREEZE and PERFORM the following MANIPULATIONS:

A. Perform RC-1, RC-2, and TC-1 and restore RWL to the normal band.

B. Place the HPCI Aux Oil Pump in Pull-to-Lock.

C. Close the MSIVs.

D. LOWER Torus Water level to approximately 115 inches using svoT48140, then MODIFY to SIMULATOR VALUE OVERRIDES (SVO)value.

E. Trip BOTH Circ Water Pumps.

F. BREAK Condenser Vacuum by opening 2N22-F002A & 2B until Condenser Vacuum is <10 in. Hg. then RECLOSE 2N22-F002A & 2B.

G. Place Main Condenser Low Vacuum Trip Bypass switches on panel 2H11-P609 &

P611 in BYPASS.

H. RESET Group 1 Isolations on P601 & P602 Panels.

I. Ensure Turbine Building Ventilation is in service.

J. Acknowledge annunciators.

3.

RUN SCENARIO FILE and EVENT TRIGGER CR_SIM 3 Init Conditions or perform the following steps 4-7.

4.

INSERT the following MALFUNCTIONS:

MALF #

TITLE FINAL VALUE H/M/S mfB21_129A Main Steam Relief Valve A Fails Stuck 1

0/0/0 mfB21_129B Main Steam Relief Valve B Fails Stuck 1

0/0/0 mfB21_129C Main Steam Relief Valve C Fails Stuck 1

0/0/0 mfB21_129D Main Steam Relief Valve D Fails Stuck 1

0/0/0 mfB21_129E Main Steam Relief Valve E Fails Stuck 1

0/0/0 mfB21_129F Main Steam Relief Valve F Fails Stuck 1

0/0/0 mfB21_129G Main Steam Relief Valve G Fails Stuck 1

0/0/0 mfB21_129H Main Steam Relief Valve H Fails Stuck 1

0/0/0 mfB21_129K Main Steam Relief Valve K Fails Stuck 1

0/0/0 mfB21_129M Main Steam Relief Valve M Fails Stuck 1

0/0/0

2023-301 CR-SIM 3 Page 7 of 14

5.

INSERT the following SIMULATOR VALUE OVERRIDES (SVO):

Activator SVO #

DESCRIPTION FINAL VALUE H/M/S ST-0 svoT48140 Water Level in Torus 75 0/40/0 ST-0 svoB21_223 Main Steam Relief Valve L Position

.31 0/0/0

6.

INSERT the following REMOTE FUNCTIONS:

REM #

DESCRIPTION FINAL VALUE H/M/S rfC71279 Group 1 Isolation Oride Jumpers ORIDE 0/0/0

7.

INSERT the following ORS OVERRIDES:

Activator TAG #

S/M/L DESCRIPTION FINAL VALUE H/M/S ST-0 diB21-F022A S

Main Steam Line Isol Vlv A CLOSE 0/0/0 ST-0 diB21-F022B S

Main Steam Line Isol Vlv B CLOSE 0/0/0 ST-0 diB21-F022C S

Main Steam Line Isol Vlv C CLOSE 0/0/0 ST-0 diB21-F022D S

Main Steam Line Isol Vlv D CLOSE 0/0/0 ST-0 diB21-F028A S

Main Steam Line Isol Vlv A CLOSE 0/0/0 ST-0 diB21-F028B S

Main Steam Line Isol Vlv B CLOSE 0/0/0 ST-0 diB21-F028C S

Main Steam Line Isol Vlv C CLOSE 0/0/0 ST-0 diB21-F028D S

Main Steam Line Isol Vlv D CLOSE 0/0/0

8.

PLACE the Simulator in FREEZE until the INITIATING CUE is given.

9.

ESTIMATED Simulator B SETUP TIME:

5 Minutes

2023-301 CR-SIM 3 Page 8 of 14 Simulator B Scenario File:

2023-301 CR-SIM 3 Page 9 of 14 EVALUATOR COPY UNIT 2 READ TO THE OPERATOR INITIAL CONDITIONS:

1.

An unisolable leak developed in the Torus.

2.

Attempts to raise Torus water level have been unsuccessful.

3.

31EO-EOP-012-2, PC flowchart, is in progress.

4.

The Reactor has been shutdown.

5.

The Shift Supervisor has determined that the plant cannot be maintained in the SAFE Region of the Heat Capacity Temperature Limit and decided to Emergency Depress the Reactor.

6.

31EO-EOP-015-2, CP-1 flowchart, is in progress.

7.

An attempt was made to Emergency Depress with the SRVs, but they have failed to open.

8.

The Main Condenser is NOT available.

9.

The Main Steam Line Drain isolation signals are BYPASSED.

10.

Turbine Building Ventilation is in service.

INITIATING CUES:

Emergency depress the Reactor with the Main Steam Line Drains IAW 31EO-EOP-108-2, Alternate RPV Depressurization.

2023-301 CR-SIM 3 Page 10 of 14 STEP PERFORMANCE STEP STANDARD SAT/UNSAT (COMMENTS)

(** Indicates critical step)

For INITIAL Operator Programs:

For OJT/OJE; ALL PROCEDURE STEPS must be completed for Satisfactory Performance.

For License Examinations; ALL CRITICAL STEPS must be completed for Satisfactory Performance.

(1) The standard for human performance tools, safety, PPE, and other pertinent expectations is considered met provided any deviations are minor and have little or no actual or potential consequence. Errors may be self-corrected provided the action would not have resulted in significant actual or potential consequences.

START TIME:__________

NOTE:

Provide the operator with a copy of 31EO-EOP-108-2.

PROMPT:

IF addressed, INFORM the operator: The Main Condenser is NOT available.

1. Operator has DETERMINED the correct procedure section to use.

Operator has DETERMINED the correct procedure section to use is Section 3.7 of 31EO-EOP-108-2 starting at step 3.7.1.

2. Align the Main Condenser for operation.

(Step 3.7.1)

Operator determines the Main Condenser is NOT available.

IF THEN PASS Human performance tools, safety, PPE met (1), AND For initial trg all steps completed correctly OR For continuing trg, critical steps (if used) completed correctly Mark the JPM as a PASS FAIL Above standards not met Mark the JPM as a FAIL

2023-301 CR-SIM 3 Page 11 of 14 STEP PERFORMANCE STEP STANDARD SAT/UNSAT (COMMENTS)

(** Indicates critical step)

3. IF vacuum of at least 10 in. Hg vacuum can NOT be drawn on the Main Condenser:

THEN ensure OPEN the Main Condenser Vacuum Breakers AND START all available Turbine Building Ventilation.

(Step 3.7.2)

At panel 2H11-P650, the operator OPENS 2N22-F002A & 2B, Main Condenser Vacuum Breakers, red lights ILLUMINATED, green lights EXTINGUISHED AND The operator determines Turbine Building ventilation is in service.

4. Bypass the Main Steam Line Drain Valve isolation signals.

(Step 3.7.3)

The operator determines from the Initial Conditions that the Main Steam Line Drain Valve isolation signals are BYPASSED.

5. Ensure the following valves are CLOSED:

2B21-F038 MSL Drain 2B21-F021 Drain (Step 3.7.4)

At panels 2H11-P601 & P602, the operator ensures CLOSED, green lights ILLUMINATED, red lights EXTINGUISHED:

2B21-F038 MSL Drain 2B21-F021 Drain

6. Ensure the following valves are CLOSED:

2B21-F020 Drain (Step 3.7.4)

At panels 2H11-P602, the operator CLOSES, green light ILLUMINATED, red light EXTINGUISHED:

2B21-F020 Drain

• • 7. Ensure the following valves are OPEN:

2B21-F016 MSL Drain (Step 3.7.5)

At panel 2H11-P602, the operator OPENS:

2B21-F016, MSL Drain, red light ILLUMINATED, green light EXTINGUISHED.

2023-301 CR-SIM 3 Page 12 of 14 STEP PERFORMANCE STEP STANDARD SAT/UNSAT (COMMENTS)

(** Indicates critical step)

• • 8. Ensure the following valves are OPEN:

2B21-F019 MSL Drain (Step 3.7.5)

At panel 2H11-P601, the operator OPENS:

2B21-F019, MSL Drain, red light ILLUMINATED, green light EXTINGUISHED.

• • 9. OPEN 2B21-F021 to reduce RPV Pressure.

(Step 3.7.6)

At panel 2H11-P602, the operator OPENS:

2B21-F021, Drain Valve, red light ILLUMINATED, green light EXTINGUISHED PROMPT:

IF addressed, INFORM the operator: When appropriate, another operator will perform the System Restoration.

END TIME:__________

NOTE: The terminating cue shall be given to the operator when:

When the operator completes step 9.

With NO reasonable progress, the operator exceeds double the allotted time.

Operator states the task is complete.

TERMINATING CUE: We will stop here.

EVALUATOR - PICK UP the Initiating Cue sheet.

2023-301 CR-SIM 3 Page 13 of 14 Summary of JPM Attributes JPM 2023-301 CR-SIM 3:

SUMMARY

OF JPM QUANTITATIVE ATTRIBUTES CATEGORY Minimum NRC Attributes JPM CONTENT Total Critical Steps At least 2 3

Step 7 Open 2B21-F016 Aligns the inboard side flow path around the MSIVs to reduce RPV pressure.

Step 8 Open 2B21-F019 Aligns the outboard side flow path around the MSIVs to reduce RPV pressure.

Step 9 Open 2B21-F021 Aligns a flow path to the Main Condenser to reduce RPV pressure Number of JPM Steps

<30 9

Time to Perform JPM

<45 min 10 min Normal / Faulted /

Alternate Path Normal Path Setting (administered)

Simulator Is LOD 1 or 5 NO NO

UNIT 2 READ TO THE OPERATOR INITIAL CONDITIONS:

1.

An unisolable leak developed in the Torus.

2.

Attempts to raise Torus water level have been unsuccessful.

3.

31EO-EOP-012-2, PC flowchart, is in progress.

4.

The Reactor has been shutdown.

5.

The Shift Supervisor has determined that the plant cannot be maintained in the SAFE Region of the Heat Capacity Temperature Limit and decided to Emergency Depress the Reactor.

6.

31EO-EOP-015-2, CP-1 flowchart, is in progress.

7.

An attempt was made to Emergency Depress with the SRVs, but they have failed to open.

8.

The Main Condenser is NOT available.

9.

The Main Steam Line Drain isolation signals are BYPASSED.

10.

Turbine Building Ventilation is in service.

INITIATING CUES:

Emergency depress the Reactor with the Main Steam Line Drains IAW 31EO-EOP-108-2, Alternate RPV Depressurization.