IR 05000482/2021010

From kanterella
Jump to navigation Jump to search
Design Basis Assurance Inspection (Teams) Inspection Report 05000482/2021010
ML21243A099
Person / Time
Site: Wolf Creek 
Issue date: 09/09/2021
From: Vincent Gaddy
Region 4 Engineering Branch 1
To: Reasoner C
Wolf Creek
References
IR 2021010
Download: ML21243A099 (16)
v • d • e


Text

September 09, 2021

SUBJECT:

WOLF CREEK GENERATING STATION - DESIGN BASIS ASSURANCE INSPECTION (TEAMS) INSPECTION REPORT 05000482/2021010

Dear Mr. Reasoner:

On August 12, 2021, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Wolf Creek Generating Station and discussed the results of this inspection with Mr. J. McCoy, Site Vice President, and other members of your staff. The results of this inspection are documented in the enclosed report.

No findings or violations of more than minor significance were identified during this inspection.

This letter, its enclosure, and your response (if any) will be made available for public inspection and copying at http://www.nrc.gov/reading-rm/adams.html and at the NRC Public Document Room in accordance with Title 10 of the Code of Federal Regulations 2.390, Public Inspections, Exemptions, Requests for Withholding.

Sincerely, Vincent G. Gaddy, Chief Engineering Branch 1 Division of Reactor Safety

Docket No. 05000482 License No. NPF-42

Enclosure:

As stated

cc w/ encl: Distribution via LISTSERV

Vincent G.

Gaddy Digitally signed by Vincent G.

Gaddy Date: 2021.09.09 09:14:19-05'00'

SUMMARY

The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting a design basis assurance inspection (teams) inspection at Wolf Creek Generating Station, in accordance with the Reactor Oversight Process. The Reactor Oversight Process is the NRCs program for overseeing the safe operation of commercial nuclear power reactors. Refer to https://www.nrc.gov/reactors/operating/oversight.html for more information.

List of Findings and Violations

No findings or violations of more than minor significance were identified.

Additional Tracking Items

None.

INSPECTION SCOPES

Inspections were conducted using the appropriate portions of the inspection procedures (IPs) in effect at the beginning of the inspection unless otherwise noted. Currently approved IPs with their attached revision histories are located on the public website at http://www.nrc.gov/reading-rm/doc-collections/insp-manual/inspection-procedure/index.html. Samples were declared complete when the IP requirements most appropriate to the inspection activity were met consistent with Inspection Manual Chapter (IMC) 2515, Light-Water Reactor Inspection Program - Operations Phase. The inspectors reviewed selected procedures and records, observed activities, and interviewed personnel to assess licensee performance and compliance with Commission rules and regulations, license conditions, site procedures, and standards.

Starting on March 20, 2020, in response to the National Emergency declared by the President of the United States on the public health risks of the coronavirus (COVID-19), inspectors were directed to begin telework. In addition, regional baseline inspections were evaluated to determine if all or a portion of the objectives and requirements stated in the IP could be performed remotely. If the inspections could be performed remotely, they were conducted per the applicable IP. In some cases, portions of an IP were completed remotely and on site. The inspections documented below met the objectives and requirements for completion of the IP.

REACTOR SAFETY

===71111.21M - Design Bases Assurance Inspection (Teams)

The inspectors evaluated the following components and listed applicable attributes, permanent modifications, and operating experience:

Design Review - Risk-Significant/Low Design Margin Components (IP Section 02.02) (5 Samples 1 Partial)

(1)125 V DC Bus NK01

  • Walkdown of 125 V DC system
  • System health reports, component maintenance history, and corrective action program documents
  • Calculations for electrical distribution, system load flow/voltage drop, short-circuit, and electrical protection
  • Protective device settings and feeder circuit breaker ratings
  • Procedures for preventive maintenance, inspection, and testing
  • Results of completed preventative maintenance on the bus, load center, transformer, and feeder breakers
  • Maintenance programs for batteries and battery chargers associated with the bus
  • Calculations for the AC input to the battery chargers

(2)4.16 KV Class 1E Switchgear NB001

  • Design basis calculations
  • Corrective actions resulting from previous violations
  • Vendor documents and recommendations
  • Circuit breaker wiring diagrams
  • Degraded voltage relaying setpoint calculations
  • Component maintenance history
  • Circuit breaker protective device settings
  • Procedures for preventive maintenance, inspection, and testing
(3) Main Steam Isolation Valve ABHV0011
  • Component maintenance history and system health reports
  • Corrective action documents
  • Preventive maintenance bases
  • Maintenance rule status and basis documents
  • Procedures for inservice testing
  • Acceptance criteria for actuation logic and slave relay surveillance testing
  • Completed surveillance and inservice tests
  • Calculations for valve stoke time adjustment
  • Calculations of setpoints and uncertainty
(4) Non-Safety Auxiliary Feedwater Pump PAP01
  • Walkdown of pump and applicable portions of the system
  • Design calculations
  • Vortex and air intrusion analysis
  • Required operator actions
  • Emergency operating procedures
  • Maintenance and testing
  • Surveillance acceptance criteria
  • Net positive suction head calculations
  • Pump curves
  • System drawings and isometrics
  • Vendor documents and recommendations
  • Corrective action documents
(5) Refueling Water Storage Tank TBN01
  • Setpoint and total loop uncertainty calculations
  • Calibration procedures and acceptance criteria calculations for level instrumentation
  • Seismic calculations for refueling water storage tank anchor bolts
  • Change packages for modifications to tank to support periodic tank inspections and repairs
(6) Evaluation of Operator Procedures and Actions Related to Components
  • Time sensitive action OPA-RHR, Control room operator action to secure residual heat removal pumps during a high-pressure event
Main article: IP 71111.21

(1)480 V Motor Control Center NG001B

  • Design basis calculations
  • Corrective actions resulting from previous violations
  • Completed work orders
  • Vendor documents and recommendations
  • Circuit breaker/motor starter wiring diagrams
  • Circuit breaker/circuit protector overload settings
  • Circuit cable sizing
  • Component maintenance history
  • Procedures for preventive maintenance, inspection, and testing

Modification Review - Permanent Mods (IP Section 02.03) (6 Samples)

(1) Change Package 20184, Replacement of ITT Barton Flow Indicator
  • Critical design attributes
  • Environmental qualification of indicator
(2) Change Package 20297, Removal of CST Level Indicator APLI0008
  • Operator actions related to APLI0008
  • Walkdown of condensate storage tank
  • Piping and instrumentation drawings of tank and level instrumentation
(3) Change Package 20316, NIS C-2 Setpoint Revision
  • Surveillance test procedures and channel calibration acceptance criteria
  • Alarm response procedures
  • Post modification testing results
(4) Change Package 20347, RCS Narrow Range RTD Lead Resistance Imbalance
  • Change package modifications for critical design attributes
  • Implementing work order
  • Safety analysis of the narrow range RTD change
(5) Change Package 20350, SGK05A/B Fuse Replacement
  • Design package including drawings, analysis, and qualification of the fuses
  • Schematic diagrams
  • Calculations supporting fuse sizing
  • Corrective action documents and implementing work orders
  • Motor data information for protective design information
  • Vendor documentation for the replaced AJT20 amp fuse and the new AJT30 amp fuse
(6) Change Package 20452, BBTY-441A RCS Loop 4 Narrow THOT Lead Resistance Imbalance
  • Critical design attributes
  • Affected electrical cable raceway and interconnection wiring drawings
  • Surveillance test procedure
  • Completed work order

Review of Operating Experience Issues (IP Section 02.06) (4 Samples)

(1) Wolf Creek Operating Experience 2018-0465, NRC Information Notice 2017-06, Battery and Battery Charger Short-Circuit Current Contributions to a Fault on the DC Distribution System
(2) Wolf Creek Operating Experience 2018-0503, Loss of Ultimate Heat Sink Inventory Through Auxiliary Feedwater Minimum Flow Lines During a Loss of the Condensate Storage Tank
(3) Wolf Creek Operating Experience 2018-0847, Discovery of a Condition that Could have Prevented Fulfillment of a Safety Function, Environmental Qualification Requirements for Atmospheric Steam Dumps
(4) Wolf Creek Operating Experience 2019-0417, NRC Information Notice 2019-002, Emergency Diesel Generator Excitation System Diode Failures

INSPECTION RESULTS

No findings were identified.

EXIT MEETINGS AND DEBRIEFS

The inspectors verified no proprietary information was retained or documented in this report.

  • On August 12, 2021, the inspectors presented the design basis assurance inspection (teams) inspection results to Mr. J. McCoy, Site Vice President, and other members of the licensee staff.

DOCUMENTS REVIEWED

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

71111.21M Calculations

41-14.02-F

RWST Displacements for New Seismic Analysis

69466-M-001

Non-Safety Auxiliary Feedwater Pump Drawdown From the

Condensate Storage Tank

69466-M-002

Non-Safety Auxiliary Feedwater Pump Net Positive Suction

Head

69466-M-003

Non-Safety Auxiliary Feedwater Pump Analysis and System

Resistance Curve

69466-M-004

Non-Safety Auxiliary Feedwater Pump Piping Vibration

Analysis

AN 98-001

Uncertainty for Refueling Water Storage Tank (RWST)

Level-Low, (Lo-Lo-1) Automatic Switchover Setpoint and

Technical Specification changes

AN-98-001-000-

CN-001

Uncertainty for Refueling Water Storage Tank (RWST)

Level-Low, (Lo-Lo-1) Automatic Switchover Setpoint and

Technical Specification changes

AN-98-026

Determination of RWST Depletion prior to Completion of

Recirculation Switchover and ECCS Recirculation Flow

Requirement

BN-20

RWST Volumes and Level Set Points

BN-20-CN002

RWST Volume and Level Set Points

BN-J-001

RWST Level Transmitter Density Errors

BN-J-002

Total Loop Uncertainty Calculation - System BN, Loops

0930, 0931, 0932, and 0933

BN-J-002-001-

CN003

Total Loop Uncertainty Calculation - System BN, Loops

0930, 0931, 0932, and 0933

BN-J-002-01-

CN001

Total Loop Uncertainty Calculation System BN, Loops 0930

0931 0932 0933

ECCS-47

SI Pumps - NPSH from RWST

EJ-30-003-

CN002

RHR Pumps A & B NPSH

FL-08

Control Building Flooding

003

FL-18

Containment Flood Levels for LOCA and MSLB

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

H-08

NB System Protective Relays

KJ-M-017

Emergency Diesel Standby Generator (KKJOlB) Runtime

Without ESW Flow

NK-E-001-004-

005

25 VDC Class 1E Battery System Sizing, Voltage Drop and

Short Circuit Studies.

005

SA-92-009

Calculation of RWST Depletion Rate and ECCS

Recirculation Switchover Time Following a Postulated

Primary/Secondary Pipe Rupture

WES-009-CALC-

001

Wolf Creek/Callaway Post-LOCA Containment Water Level

Calculation

XX-E-006

AC System Analysis

006

XX-E-006

AC System Analysis

XX-E-006

AC System Analysis

XX-E-009

System NB, NG, PG Undervoltage/Degraded Voltage Relay

Setpoints

Corrective Action

Documents

Condition Report

(CR-)

2007-01786, 47791, 74322, 104253, 104389, 104390,

28300, 133632, 135223, 66596, 66841, 103323, 104458,

104515, 105136, 105564, 105741, 105744, 105969, 106015,

114883, 118661, 124196, 129263, 130202, 10000916,

10001446, 10002218, 10005090, 10007183, 10007246,

100007975, 00124312, 00138042, 00145626, 00131142,

10000792

Corrective Action

Documents

Resulting from

Inspection

Condition Report

(CR-)

10007140, 10007142, 10007145, 10007147, 10007163,

10007662, 10007666, 10007668, 10007802, 10008018,

10007616, 10008023, 10008009, 10007407, 10007596,

10007621, 10007625, 10007632, 10007633, 10007667,

10007975, 10008021, 10008065, 10008092, 10008133

Drawings

8809D54

T HAVE Loop 4 (TEST) Protection IV Card Frame 08

Cabinet 04 Interconnecting Wiring Diagram

5A

C-0C0212

Refueling & Reactor Makeup Water Storage Tanks,

Concrete Neat Line & Reinforcing Plans and Sections

E-11001

Main Single Line Diagram

E-11NB01

Lower Medium Voltage Sys. Class 1E 4.16 kV Single Line

Meter and Relay Diagram

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

E-11NG01

Low Voltage System Class 1E 480V Single Line Meter &

Relay Diagram

E-11NG01

Low Voltage System Class 1E 480V Single Line Meter &

Relay Diagram

E-11NK01

Class 1E 125V DC System Meter & Relay Diagram

E-11NK02

CLASS IE 125V DC System, Meter & Relay Diagram

E-13EP02A

Schematic Diagram Accumulator Isolation Valves

E-13GK04

Schematic Diagram Battery Rm. Hydrogen Alarm

E-13NB01

Lower Medium Class 1E Meter and Voltage System 4.16 kV

Three Line Relay Diagram

E-13NB02

Lower Medium Voltage Sys. Class 1E 4.16 KV Three Line

Meter & Relay Diagram

E-13NB03

Lower Medium Voltage Sys. Class 1E 4.16kv Meter and

Relay Three Line Diagram

E-13NB12

Schematic Diagram Class 1E Bus NB01 Feeder Brkr.

2NB0112

E-13NB13

Schematic Diagram Class 1E Bus NB01 Feeder Brkr.

2NB0109

E-13NE10

Schematic Diagram 4.16KV DG Feeder Breaker 152NB0111

E-13NG10

Schematic Diagram 4.16KV LC XFMR Feeder Breakers

2NB0110 and 152NB0113

E-17000A

Termination List Notes

J-14001

Control Room Equipment Arrangement.

KD-74-96, Sh. 1

One Line Diagram

KD-7496

One Line Diagram

KD-7496A

Distribution System Equipment Lineup Limitations

M-12BN01

Piping & Instrumentation Diagram, Borated Refueling Water

Storage System

M-1H3311

HEATING VENTILATING & AIR COND. CONTROL

BUILDING EL. 2000'-0" AREA 1

M-1P3411

Drainage System (LE & LF) Control Building, EL. 2O16'- 0

Area 1

M-622.1-00036-

W03

Electrical Motor Data Sheet, Bahnson Ref: N-0027 Thru N-

003`

1W

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

N1387-637A-B1

SGK05A & SGK05B Air Conditioner, Electrical Schematic

WIP-M-761-

2328-W01-A-1

T HAVE Loop 1 (Test) Protection Card Frame 2/4 Cabinet 1

Interconnecting Wiring Diagram.

Engineering

Changes

20452

BBTY-441A RCS LP4 Narrow THOT Lead Resistance

Imbalance

CP 014426.

Utilization of Spare RTD BBTE0430A1,

CP 20316

NIS C-2 Setpoint Revision

Document

Number: 020350,

EC Engineering for SGK05A/B Fuse Replacement, Rev. 0

EC. 020347

RCS NARROW RANGE RTD LEAD RESISTANCE

IMBALANCE

Engineering

Evaluations

LTR-SCS-19-17

Wolf Creek Nuclear Operating Corporation C-2 Interlock

Setpoint Revision

PQE-J-601B-P01

Atmospheric Relief Valve 8005N I/P Converter w/ Metallic

Nozzle Cap

WCAP-11528

RCS Flow Anomaly Investigation Report

04/01/1988

WCAP-9917

Setpoint Study for Kansas Gas and Electric Co./Kansas City

Power and Light Co. Wolf Creek Unit and Union Electric Co.

Callaway Units 1 and 2 (SNUPPS Projects)

06/01/1981

Miscellaneous

Technical Requirements Manual

04-00383

WOLF CREEK GENERATING STATION - ISSUANCE OF

AMENDMENT

RE: TECHNICAL SPECIFICATIONS 3.8.1 AND 3.8.4 - AC

AND DC SOURCES

(TAC NO. MB8763)

07/12/2004

50.59 for DECP

50.59 screening for RCS Narrow range RTD Lead

Resistance Imbalance engineering design change.

AD 20347

Applicability Determination for 50-59 for DCP 020347

ANSI/I EEE

C57.12.01-1979

American National Standard - General requirements for dry-

type distribution and power transformers

11/30/1979

Bulletin 6.10-2C

ITE Series 5600 Motor Control Centers - design and

application guide

2/1976

CJ16224-l

Dedication Plan for MERSEN Fuse PIN: AJT30

2, 11/25/19

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

CP 20350

CP 20350 Attachment 2 for XX-E-006 REV 8 ETAP

MODEL\\XX-E-006 REV 8.O

10-31-2019

CR 00145500

Level Of Effort Evaluation for NRC 3Q2020 Integrated

Inspection Self-revealing Green NCV

N/A

E-009

Technical Specification for Metal-Clad Switchboard for the

Standardized Nuclear Unit Power Plant System

E-009-00342

(GEH-1802X)

Metal-Clad Switchgear - Types M26 and M36 for Magne-

Blast Air Circuit Breakers

W09

E-009B

Design Specification for 4.16 KV and 13.8 KV Vertical Lift

Vacuum Circuit Breakers

E-009B-00009

Instruction Manual for Siemens Type 3AF-GER/GEU Vertical

Lift Direct Replacement Vacuum Circuit Breakers

W06

E-00NG

System Description Low Voltage System - 480 V (Class 1E

Power System)

E-018

Technical Specification for Motor Control Centers For The

Wolf Creek Generation Station

E-018A-00007

Instruction Manual For Molded Case Circuit Breaker

W15

E-10NB

System Description Lower Medium Voltage System - 4.16

kV (Class IE Power System)

E-11NG20

Low Voltage System Class 1E Motor Control Center

Summary

2

Frame Book 29-

111

Westinghouse Series C Motor Circuit Protector

05/1986

GEK-7310C

Maintenance Manual - GE Power Circuit Breakers Types

AKR-3/3A-50 and AKRU-3/3A-50

LTAM WCNOC-

09-0152

480 Volt Safety Related MCC Bucket Replacement

1/20/2021

LTR-SCS-16-59

Westinghouse Evaluation to Support 95% Probability/95%

Confidence Level Uncertainty Values for Non-Westinghouse

Supplied Instrumentation for the Wolf Creek Generating

Station Revised Thermal Design Procedure Uncertainty

Calculations in WCAP-18083-P.

M-10BN

Borated Refueling Water Storage

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

MGE EOOP-11

Molded Case Circuit Breaker and Ground Fault Sensor

Testing

37A

N/A

Maintenance Strategy - XNG01

8/5/201

NB SHR 2020

Q3Q4

System Health Report - System NB (Low-Medium Voltage

4.16 kV) Third and Fourth Quarter

PIR 2007-00368

Supplement to Condition Report 2008-002718 - DG Parallel

CR Response with Scenario Table

06/19/2008

PSA-05-0011

Probabilistic Risk Assessment System Notebook - Electrical

Power Systems

TS-19-0001

Fuse list Change for Fuses 109FU, 110FU, 111FU

N/A

Procedures

AI 12-002

FME Consideration and General Guidance for Major

Components

0A

AI 21-016

OPERATOR TIME CRITICAL ACTIONS VALIDATION

AI 29B-003

Guidance To Prevent Unacceptable Preconditioning Prior To

Testing

ALR 00-47D

RWST Lev LoLo 1 Auto XFR

10B

ALR 00-82A

PR Over PWR Rod Stop

ALR 301

25 VDC CLASS IE SWITCHBOARD NK01

AP 12-003

Foreign Material Exclusion

AP 14A-003

Scaffolding Construction

CNT-ME-507

Installation & Inspection of Cable Terminations

E-009Q-01

13.8 KV and 4.16 KV Switchgear Inspection and Testing

37A

E-017

Technical Specification for Load Center Unit Substations for

the Standardized Nuclear Unit Power Plant System

E-020

DC Distribution Switchboards

009

E-050A-00010

Installation Instructions for AT&T Lineage 2000 Round Cell

Batteries Racks and Seismic Bracing at Wolf Creek Nuclear

Power Plant

W01

E-050A-00010

Installation Instructions for AT&T Lineage 2000 Round Cell

Batteries Racks and Seismic Bracing at Wolf Creek Nuclear

Power Plant

W01

E-051B

Electrically Operated Manually Controlled Transfer Switches

E-051B-0031

Instruction Manual for Transfer Switch Panels

W04

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

E-075-00016

Instruction Manual for Installation, Operations, &

Maintenance of ESWS Transformers 225 KVA FOR

SNUPPS 10466

W06

E-10NK

System Description for 125-Volt DC System (Class 1E

Power System)

007

E-11013

Installation, Inspe49ction, and Testing Details for Electrical

Equipment and Cables.

EMG C-0

Loss of All AC Power

EMG ES-12

Transfer to Cold Leg Recirculation

EMG ES-12

Transfer to Cold Leg Recirculation

EMG FR-H1

Response to Loss of Secondary Heat Sink

I-ENG-005

Infrared Thermography

MGE EOOP-05

Insulation Resistance Testing

MGE EOOP-11

Molded Case Circuit Breaker and Ground Fault Sensor

Testing

37A

MGE TL-001

Wiring Termination and Lug/Connector Installation

26A

MPE E009Q-03

Inspection and Testing Of Siemens Vacuum Circuit Breakers 11

MPE E017Q-04

Circuit Breaker Test for AKR 50 and AKR 30 Breakers

31B

MPE E017Q-07

Load Center Transformer Inspection

17A

OE 2018-0465

NRC Information Notice 2017-06

06/14/2018

OFN NB-042

Loss Of Offsite Power To NB01 (NB02) With EDG Paralleled

STC-IC-441

Channel Calibration Nuclear Instrumentation System Power

Range Channel N41

16A

STN KU-010

Station Blackout Diesel and Non-Safety AFW Pump Test

STS CH-029

Refueling Water Storage Tank Boron Concentration

Determination

8A

STS EN-100A

Containment Spray Pump A Inservice Test

STS IC-201A

TAVG, Delta T and Pressurizer Pressure Channel

Operational Test-Protection Set 1

STS IC-442

Channel Calibration Nuclear Instrumentation System Power

Range Channel N42

16A

STS IC-443

Channel Calibration Nuclear Instrumentation System Power

Range Channel N43

16A

Inspection

Procedure

Type

Designation

Description or Title

Revision or

Date

STS IC-444

Channel Calibration Nuclear Instrumentation System Power

Range Channel N44

17A

STS IC-500G

Delta T/TAVG Instrumentation Loop 4 Channel Calibration

28B

STS IC-508A

Refueling Water Storage Tank Level Transmitter Calibration

STS IC-508B

Refueling Water Storage Tank Level Instrumentation

Channel Calibration

STS IC-803A

4KV Undervoltage - Grid Degraded Voltage Channel

Calibration of NB01 Bus

STS KJ-011A

EDG NE01 24 Hour Run

STS MT-018

Weekly Inspection of 125 VDC Lead-Calcium Batteries

23B

STS MT-020

25 VDC Battery Charger Operational Test

26B

STS MT-020

25 VDC Battery Charger Operational Test

26B

STS MT-024A

Functional Test of 480 and 120 Volt Molded Case Circuit

Breakers

16A

STS MT-024B

Functional Test of 480 and 120 Volt Molded Case Circuit

Breakers

STS MT-024C

Functional Test of 480 and 120 Volt Molded Case Circuit

Breakers

SYS AP-122

Non-Safety Auxiliary Feed Pump Operation

Work Orders

Work Order (WO-

)

2-359863-000, 14-389904-000, 18-442405-001, 18-

2406-001, 18-442408-001, 18-442426-001, 19-448418-

000, 19-448418-002, 19-448418-004, 20-465688-000, 20-

458894-000, 20-458895-000, 20-458896-000, 20-458898-

000, 20-458900-000, 20-458901-000, 20-458905-002, 20-

461085-000, 20-461085-001, 20-462400-000, 20-462400-

001, 20-465688-000, 20-466586-000, 20-461440-000, 20-

466529-000, 20-466528-000, 19-455924-000, 14-383742-

000, 20-458317-001, 01-224289-000, 10-327766-000, 12-

359819-000, 17-421614-000, 08-303906-000,. 04-259537-

000, 13-372243-000, 15-405081-000, 18-444596-000, 17-

21067-003, 18-437036 000, 20-467595-000, 20-458103-

001

Retrieved from "https://kanterella.com/w/index.php?title=IR_05000482/2021010&oldid=3809981"