IR 05000346/2021011

Design Basis Assurance Inspection (Teams) Inspection Report 05000346/2021011

ML21301A162
Person / Time
Site:	Davis Besse
Issue date:	11/01/2021
From:	Karla Stoedter NRC/RGN-III/DRS/EB2
To:	Tony Brown Energy Harbor Nuclear Corp
References
IR 2021011
Download: ML21301A162 (14)

Text

SUBJECT:

DAVIS-BESSE NUCLEAR POWER STATION - DESIGN BASIS ASSURANCE INSPECTION (TEAMS) INSPECTION REPORT 05000346/2021011

Dear Mr. Brown:

On October 21, 2021, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Davis-Besse Nuclear Power Station and discussed the results of this inspection with you 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, Karla K. Stoedter, Chief Engineering Branch 2 Division of Reactor Safety Docket No. 05000346 License No. NPF-3

Enclosure:

As stated

Inspection Report

Docket Number: 05000346

License Number: NPF-3

Report Number: 05000346/2021011

Licensee: Energy Harbor Nuclear Corp.

Facility: Davis-Besse Nuclear Power Station

Location: Oak Harbor, OH

Inspection Dates: October 04, 2021 to October 21, 2021

Inspectors: C. Bickett, Senior Reactor Inspector J. Corujo-Sandin, Senior Reactor Inspector B. Daley, Senior Reactor Inspector C. Hobbs, Reactor Inspector G. O'Dwyer, Reactor Engineer E. Sanchez Santiago, Senior Reactor Inspector

Approved By: Karla K. Stoedter, Chief Engineering Branch 2 Division of Reactor Safety

Enclosure

SUMMARY

The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees performance by conducting a design basis assurance inspection (teams) inspection at Davis-Besse Nuclear Power 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)

=

(1) D1_ED - 125/250 VDC Motor Control Center 1. Updated Safety Analysis Report/Technical Specification/Technical Requirements Manual Licensing Basis Requirements 2. Component Walkdown 3. Operating Procedures 4. Maintenance Effectiveness 5. Translation of Vendor Specifications 6. Electrical Design Calculations and Considerations:

a. Short Circuit Calculations b. Motor Control Center Capacity c.

Degraded Voltage d. Overcurrent Protection e. Coordination Calculations

(2) DH12 - Reactor Coolant System to Decay Heat System Isolation Valve 1. Updated Safety Analysis Report/Technical Specification/Technical Requirements Manual Licensing Basis Requirements 2. System Walkdown 3. Operating Procedures 4. Maintenance Effectiveness 5. System Health 6. Translation of Vendor Specifications

7. Environmental Qualification

8. Protection Against External Events:

a. Seismic b. Fire 9. Mechanical Design:

a. Weak Link Analysis b. Required Thrust c.

Pressure Locking and/or Thermal Binding d. Closure/Opening Time e. Maximum Differential Pressure 10.Test/Inspection Procedures, Acceptance Criteria, and Recent Results:

a. Leakage b. In-service Testing c.

Technical Specification Required Surveillance d. Actuation Test 11.Motor Power Requirements:

a. Voltage Drop b. Control Logic c.

Control Voltage Drop d. Load Flow e. Thermal Overload f.

Required Minimum Voltage g. Degraded Voltage Effects h. Brake Horsepower i.

Motor Thermal Overload Protection j.

Cable Ampacity k.

Protective Devices l.

Emergency Power

(3) DB1CP - Battery Charger 1. Updated Safety Analysis Report/Technical Specification/Technical Requirements Manual Licensing Basis Requirements 2. Component Walkdown 3. Operating Procedures 4. System Health 5. Translation of Vendor Specifications 6. Electrical Design Calculations and Considerations:

a. Sizing b. Current Limiting Setting c.

Duty Cycle d. Contribution to Short Circuit Fault Current e. Sizing of Protective Fuses/Breakers/Relays f.

Voltage Drop Calculation

(4) Bus D1 - 4160V Switchgear 1. Updated Safety Analysis Report/Technical Specification/Technical Requirements Manual Licensing Basis Requirements 2. Component Walkdown 3. Operating Procedures 4. Maintenance Effectiveness 5. System Health

6. Translation of Vendor Specifications

7. Environmental Qualification 8. Protection Against External Events:

a. Flooding b. Seismic c.

HELB d. Fire 9. Test/Inspection Procedures, Acceptance Criteria, and Recent Results:

a. Load Testing b. Technical Specification Surveillance c.

Relay Calibration d. Terminal Corrosion Resistance 10.Electrical Design Calculations and Considerations:

a. Loading Calculations b. Short Circuit Calculations c.

Voltage Regulation d. Coordination Calculations e. Temperature Effects and Equipment Qualification f.

Degraded Voltage Protection g. Loss of Voltage h. Breaker Settings and Ratings to Prevent Spurious Tripping i.

Breaker Control Voltage j.

Breaker Control Logic k.

Harmonic Content l.

Transmission System Protection m. Fast Bus Transfer Scheme n. Surge Protection o. Cable Ampacity p. Protective Relays and Trip Setpoints

Design Review - Large Early Release Frequency (LERFs) (IP Section 02.02) (1 Sample)

(1) T10 - Borated Water Storage Tank 1. Updated Final Safety Analysis Report/ Technical Specifications/ Technical Requirements Manual 2. Component Walkdown 3. Operating Procedures 4. System Health 5. Protection against Seismic Events 6. Mechanical Design Calculations and Considerations:

a. Available and Required Volume (Loss of Coolant Accident)b. Level Setpoints c.

Instrument Uncertainty 7. Test/Inspection Procedures, Acceptance Criteria and Recent Results:

a. Instrument Setpoints b. Technical Specification Surveillances c.

Aging Management Program

Modification Review - Permanent Mods (IP Section 02.03) (5 Samples)

(1) Engineering Change (EC) 13-195-016, Emergency Feedwater Facility Air Intake Damper

(2) EC 15-138-002, Target Rock Auxiliary Power Supply Isolation

(3) EC 16-050-001, Station Blackout Generator Radiator Tube Bundle Replacement

(4) EC 16-478-002, Loop Seal in Borated Water Storage Tank to Spent Fuel Pool Purification Supply Pipe

(5) EC 18-236-001, Replacement Breaker for BE1168

Review of Operating Experience Issues (IP Section 02.06) (2 Samples)

(1) Information Notice (IN) 2015-05, Inoperability of Auxiliary and Emergency Feedwater Auto-start Circuits on Loss of Main Feedwater Pumps

(2) IN 2017-06, Battery and Battery Charger Short-circuit Current Contributions to a Fault on the Direct Current Distribution System

INSPECTION RESULTS

No findings were identified.

EXIT MEETINGS AND DEBRIEFS

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

On October 21, 2021, the inspectors presented the design basis assurance inspection (teams) inspection results to Terry Brown, Site Vice President and other members of the licensee staff.

DOCUMENTS REVIEWED

Inspection Type Designation Description or Title Revision or

Procedure Date

71111.21M Calculations 35.004 Borated Water Storage Tank 2

35.013 BWST Capacity Study 0

36.023 BWST Heater 2

C-EE-002.01-010 DC CALC - Battery and Charger Sizing, Short Circuit, and 33

Voltage Drop

C-EE-002.01-011 Low Voltage Coordination Calculation 7

C-EE-004.01-049 4.16 kV Bus C1/D1 Degraded Voltage, Loss of Voltage, and 15

27X-6 Relay Setpoints

C-EE-015.03-008 AC Power System Analysis 7

C-FC-013.10-018 NFPA 805 Safe Shutdown, Non-Power Operation, and Fire 1

PRA Cable Selection Calculation

C-ICE-048.01-SFAS BWST Low Level Setpoint 8

004

C-ME-049-02-110 Maximum Differential Pressure Across DH11 and DH12 1

C-ME-049.01-130 BWST Purification Hydraulic Model 0

C-ME-099.16-006 Recalculate Thrust Torque Capability for MOVs CFIA, CFIB, 1

DH11, and DH12

C-ME-099.16-006 Clearly Establish Calculation Addendum's Informational Use01/24/2008

Rev. 1 Add 1

C-ME-49.01-078 Tank Level Curve Calculation - Borated Water Storage Tank 1

(T-10)

C-NSA-028.01-Hazard to Control Room Operators from Materials Stored 3

004 Onsite

C-NSA-049.01-Vortex Formation with ECCS Pump Suction from BWST 06/04/1997

004

C-NSA-049.01-Determination of Analytical Limit for Borated Water Storage 3

004 Tank Transfer Permissive

C-NSA-049.01-Vortex Formation with ECCS Pump Suction from the BWST 1

004

C-NSA-049.02-LPI, CS, and HPI Pump NPSH with Suction from the BWST 0

048

C-NSA-049.02-LPI, CS, and HPI Pump NPSH with Suction from the BWST 0

Inspection Type Designation Description or Title Revision or

Procedure Date

048 Addendum 1

C-NSA-049.02-LPI, CS, and HPI Pump NPSH with Suction from the BWST 0

048 Addendum 2

VA04-B001-001 Borated Storage Tank Foundation 2

Corrective Action 03-04356 RFA-CR for Additional Shielding at BWST 06/04/2003

Documents 04-04502 RFA Annual Engineering Evaluation of Installed Shielding 7/12/2004

(DB-HP-04027, Step 5.2)

CR-2015-01817 NRC CDBI 2015 - Operability of BWST while on SFP 02/11/2015

Purification

CR-2015-02476 NRC CDBI 2015 - EDG Powering Nonessential 4160V Bus 02/26/2015

CR-2016-04735 19R BACC - Packing Leak Found on DH12 04/06/2016

CR-2017-01853 Paint Degraded on BWST DB-T10 02/20/2017

CR-2018-00607 T10 BWST Tank 1-1 Coating Deteriorated 01/23/2018

CR-2018-02257 20R BACC - Packing Leak Found on DH12 03/10/2018

CR-2018-07962 Relays 27A-3 and 27A-4 Found Unsat During Monthly 09/08/2018

Surveillance

CR-2018-08352 NRC DBAI 2018 - UFSAR Descriptions of SBODG Function 09/21/2018

Are Inconsistent

CR-2018-08578 NRC DBAI 2018 - Potential Deficiency Identified in 09/28/2018

Procedure DB-OP-02511

CR-2018-08883 DC Bus Ground Received During Restoration of FW6459, 10/09/2018

MDFP Discharge to OTSG 1

CR-2018-09725 D1 Under Voltage Relay as Found Condition Out of 11/02/2018

Tolerance

CR-2018-10598 EFWF Camper HA 1350 Will Not Fully Close 12/03/2018

CR-2019-00687 D1 Under Voltage Relay as Found Condition Out of 01/23/2019

Tolerance

CR-2019-08598 BACC Leak on 46-HSC-155-1 Shop Weld C on ECCS 1 10/18/2019

Sump Pump Discharge

CR-2020-01949 1R21 BACC: Packing Leak on DH12 03/08/2020

CR-2021-01130 D1 Under Voltage Relay 27A-4 Out of Calibration 02/19/2021

CR-2021-01131 D1 Under Voltage Relay 27A-2 Out of Calibration 02/19/2021

CR-2021-05590 BACC New Leak on 1 ECCS Rm Sump Pump Piping 07/22/2021

Inspection Type Designation Description or Title Revision or

Procedure Date

Corrective Action CR 2021-07171 Part 21 Equalize Circuit of AMETEK Battery Chargers 09/24/2021

Documents CR-2021-07352 Updated Calculated DC Short Circuit Current in Calculation 10/01/2021

Resulting from C-EE-002.01-010 Exceeds Short Circuit Ratings for 125VDC

Inspection Distribution Panel DAP

CR-2021-07458 NRC DBAI 2021 - Clarification of Result and Conclusions 10/06/2021

Summary in C-EE-002.01-010

CR-2021-07464 HV5336B (EDG2 Room HVAC Recirc Damper Hydramotor 10/06/2021

Position Indicator Labels Incorrectly Depict "Open" and

"Shut"

CR-2021-07512 NRC DBAI 2021 - Excessive Grease Identified on 1P Battery 10/08/2021

Connector

CR-2021-07515 NRC DBAI 2021 - Clarification of Output Documents to 10/08/2021

Calculation C-EE-004.01-049 (4.16 kV Bus C1/D1 Degraded

Voltage, Loss of Voltage, and 27X-6 Relay Setpoints)

CR-2021-07710 NRC DBAI 2021 - Clarification of the Battery Charger 10/14/2021

Description in SD-007

CR-2021-07904 NRC DBAI 2021 - Error in Previous Revision 30 of 10/20/2021

C-EE-002.01-010

CR-2021-07914 NRC DBAI 2021 - Unable to Identify CRs Related to WO 10/20/2021

200751566 and WO 200679064 Regarding Instrument o

As-Found Out of Tolerance

Drawings E-1 Electrical System One-Line Diagram, Sheet 1 39

E-1 Electrical System One-Line Diagram, Sheet 2 90

E-3 4.16 kV Metering and Relaying One-Line Diagram 45

E-4 480 V Unit Sub-Station Lighting Distribution One-Line 53

Diagram, Sheet 4

E-6 480 V MCC (Essential) One-Line Diagram, Sheet 1 96

E-7 250/125V DC and Instrumentation AC One Line Diagram

P-35216-1 10 - 12 Forged Bolted Bonnet Nuclear Gate Valve T3

Engineering 15-00138-002 Target Rock Auxillary Power Supply Isolation 10

Changes 16-0050-001 Station Blackout Diesel Generator Radiator Tube Bundle 3

Replacement

ADL-13-195-016 Affected Documents List for ECP 13-195-016 Revision 3 3

ECP 13-195-016 Engineering Change Package EFW Facility Air Intake 3

Inspection Type Designation Description or Title Revision or

Procedure Date

Damper HA1350 Installation

ECP 16-0478-002 Loop Seal in BWST to SFP Purification Supply Pipe - Piping 2

and Mechanical

ECP-18-0236-001 Replacement of Breaker BE1168 11/06/2018

Engineering 601189516 DB-EER: DB-OP-02511 SWP Restart Direction 10/01/2018

Evaluations B-0027 Limitorque Valve Actuator Temperature Related to High 10/18/1978

Superheat Ambient Temperatures

Miscellaneous DB-ME3003-002 Station Battery Charger Test 2

DBRM-EMER-Davis-Besse Emergency Action Level Basis Document 9

1500A

ML060400472 Davis-Besse Nuclear Power Station, Unit No. 1, Issuance of 08/09/2006

Amendment, RE: Safety Features Actuation System

Instrumentation Setpoints and Surveillance Testing

Requirements (TAC No. MC3084)

ML081410652 Davis-Besse Nuclear Power Station Unit No. 1, Issuance of 06/30/2008

Amendment, RE: Measurement Uncertainty Recapture

Power Uprate (TAC No. MD8326)

ML15103A639 Davis-Besse Nuclear Power Station Component Design 04/10/2015

Basis Inspection, NCV 2015-008-01, Vulnerability of EDG

Crosstie to a Non-Essential Bus

OE 2015-0524 Evaluation of Information Notice 2015-05 05/20/2015

OE-2017-0561-1-Operating Experience Review of IN 2017-06 11/28/2017

FA003

OPS-SYS-1213 Auxillary Feedwater Training Lesson Plan 9

RFA 99-0271 BWST Shielding 09/07/1999

SD-007 System Description for 125/250V and 120V Instrumentation 6

SD-042 System Description for Decay Heat Removal System 7

SUS #048-01 System Monitoring Plan - SFAS 1

VMAN E-018Q-GNB Station Batteries 10

00017

VMAN-E-855Q-Ametek Solidstate Controls Instruction/Technical Manual 4

00001

Procedures DB-HP-01802 Control of Shielding 13

DB-HP-04027 Installed Shielding Inspection 9

Inspection Type Designation Description or Title Revision or

Procedure Date

DB-ME3046-001 D1 Bus Undervoltage Units Monthly Functional Test 01/24/2020

DB-ME3051-001 D1 Bus Degraded Voltage Relay Calibration 03/15/2021

DB-ME3052-001 D1 Bus Loss of Voltage Relay Calibration 02/18/2019

DB-MM-09118 EDG Governor Removal, Installation, and Adjustment 11

DB-OP-02000 RPS, SFAS, SFRCS Trip or SG Tube Rupture 3

DB-OP-02000 RPS, SFAS, SFRCS Trip, or SG Tube Rupture 31

DB-OP-02003 ECCS Alarm Panel 3 Annunciators 18

DB-OP-02511 Loss of Service Water Pumps/Systems 21

DB-OP-03006 Miscellaneous Instrument Shift Checks 66

DB-OP-06015 Borated Water Storage Tank Operating Procedure 23

DB-OP-06261 Service Water System Operating Procedure 74

DB-OP-06901 Plant Startup 45

DB-SP-04457 External Surfaces Monitoring Inspections 1

DBBP-ESAF-Operation of the Drager Gas Detection Pump 0

2008

NG-EN-00561 Above Ground Steel Tanks Inspection Program 1

NOP-CC-3002 Calculations 8

NOP-ER-3030 Surveillance Frequency Control Program 0

NOP-LP-2001 Corrective Action Program 48

NORM-OP-1009 SRO Review of Condition Reports 11

RA-EP-02850 Hazardous Chemical and Oil Spills 11

Work Orders 200817863 Performance of DB-PF-03272 Post Maintenance Valve Test 03/14/2020

Completed 03/14/2020

200229795 Replace Limit Switch for Valve DH12 01/20/2008

200634198 PM 9241 T10 Perform External Inspection 02/22/2017

200634813 PM 11756 T10 External Volumetric Inspection 10/20/2016

200638292 Auxillary Feed Pump 1-1 Discharge Control Valve Position 09/28/2019

Controller

200679064 M13148-001 08.000 LT1525D BWST LEVEL CAL 07/31/2018

200679882 Install Tornado Check Dampers in EFWF 05/19/2017

200688077 Clean, Inspect, and Test MVDH12, RCS to Decay Heat 03/17/2018

System Isolation Valve Motor (DH12)

200698909 M13147-001 08.000 LT1525C BWST LEVEL CAL 01/04/2019

Inspection Type Designation Description or Title Revision or

Procedure Date

200707583 T-10 Repair Coatings 02/20/2017

200712553 18 Month Fire Damper Inspection 05/13/2020

200740520 Inspection Indicates Tank T-10 has Loose Paint/Coating 01/23/2018

200746407 Fix Packing Leak Found on DH12 03/12/2020

200751566 MI3145-001 08.000 LT1525A BWST LEVEL CAL 07/16/2020

200756176 Performance of Test Procedure Decay Heat Removal 03/09/2020

Isolation Test DB-SP-03130

200774792 Replace LT1525C BWST Level SFAS CH 3 01/04/2019

200799975 SBODG Monthly Test 08/21/2021

200801860 SBODG Monthly Test 09/25/2021

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