IR 05000338/2021012
| ML21176A056 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 06/25/2021 |
| From: | Scott Shaeffer Division of Reactor Safety II |
| To: | Stoddard D Virginia Electric & Power Co (VEPCO) |
| References | |
| IR 2021012 | |
| Download: ML21176A056 (12) | |
Text
June 25, 2021
SUBJECT:
NORTH ANNA POWER STATION - TRIENNIAL FIRE PROTECTION INSPECTION REPORT 05000338/2021012 AND 05000339/2021012
Dear Mr. Stoddard:
On May 13, 2021, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at North Anna Power Station. On May 13, 2021, the NRC inspectors discussed the results of this inspection with Mr. Fred Mladen, 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,
/RA/
Scott M. Shaeffer, Chief Engineering Branch 2 Division of Reactor Safety Docket Nos. 05000338 and 05000339 License Nos. NPF-4 and NPF-7
Enclosure:
As stated
Inspection Report
Docket Numbers: 05000338 and 05000339 License Numbers: NPF-4 and NPF-7 Report Numbers: 05000338/2021012 and 05000339/2021012 Enterprise Identifier: I-2021-012-0006 Licensee: Virginia Electric and Power Company Facility: North Anna Power Station Location: Mineral, Virginia Inspection Dates: April 26, 2021 to May 13, 2021 Inspectors: P. Braaten, Senior Reactor Inspector J. Dymek, Reactor Inspector J. Montgomery, Senior Reactor Inspector D. Strickland, Reactor Inspector Approved By: Scott M. Shaeffer, 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 triennial fire protection inspection at North Anna 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
Type Issue Number Title Report Section Status URI 05000338,05000339/20 URI 2021012-01 for North 71111.21N.05 Open 21012-01 Anna Power Station Unit 1 and Unit 2. Following a fire-induced hot short stall event of NAPS CVCS MOVs, there is uncertainty whether valves' pressure boundary components would be compromised and challenge safe shutdown capability.
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.
REACTOR SAFETY
71111.21N.05 - Fire Protection Team Inspection (FPTI) Structures, Systems, and Components (SSCs) Credited for Fire Prevention, Detection, Suppression, or Post-Fire Safe Shutdown Review (IP Section 03.01)
The inspectors verified that components and/or systems will function as required to support the credited functions stated for each sample. Additional inspection considerations are located in the fire hazards analysis (FHA) or safe shutdown analysis (SSA).
- (1) a. Review deficiencies or open fire protection impairments for the selected system, including any temporary modifications, operator workarounds, or compensatory measures.
b. Verify that operator actions can be accomplished as assumed in the licensees FHA, or as assumed in the licensees fire probabilistic risk assessment (FPRA)analysis and SSA.
c. Review repetitive or similar maintenance work requests which could be an indicator of a design deficiency and could affect the ability of the components to perform their functions, when needed.
d. Ensure that post maintenance and/or surveillance activities are performed as scheduled.
e. Perform a walkdown inspection to identify equipment alignment discrepancies.
Inspect for deficient conditions such as corrosion, missing fasteners, cracks, and degraded insulation.
f. Ensure the selected SSCs that are subject to aging management review (AMR)pursuant to 10 CFR Part 54 are being managed for aging (e.g., loss of material, cracking, reduction of heat transfer) in accordance with appropriate aging management programs. Verify that the licensees aging management program activities (such as, Fuel Oil Analysis or Selective Leaching Aging Management Program) associated with FP equipment are being implemented.
g. If a review of operating experience issues will be completed for the selected inspection sample, verify that the licensee adequately reviewed and dispositioned the operating experience in accordance with their processes.
The team selected the following SSCs as samples:
- Automatic Wet Pipe Sprinkler on elev. 259' 6" of FA 11 (Auxiliary Building)
(2)
(3)
- Unit 2 Chemical Volume and Control System (CVCS)
(4)
- Unit 2 480VAC Distribution System
Fire Protection Program Administrative Controls (IP Section 03.02) (1 Sample)
The inspectors verified that the selected control or process is implemented in accordance with the licensees current licensing basis. If applicable, ensure that the licensees FPP contains adequate procedures to implement the selected administrative control. Verify that the selected administrative control meets the requirements of all committed industry standards.
(1)
- Combustible Control Program
Fire Protection Program Changes/Modifications (IP Section 03.03) (2 Samples)
The inspectors verified the following:
a. Changes to the approved FPP do not constitute an adverse effect on the ability to safely shutdown.
b. The adequacy of the design modification, if applicable.
c. Assumptions and performance capability stated in the SSA have not been degraded through changes or modifications.
d. The FPP documents, such as the Updated Final Safety Analysis Report, fire protection report, FHA, and SSA were updated consistent with the FPP or design change.
e. Post-fire SSD operating procedures, such as abnormal operating procedures, affected by the modification were updated.
(1)
- ETE-NA-2019-0030, Appendix R Program Implementation of SM-1841, Appendix R Emergency Switchgear Room (ESGR) Fire Natural Circulation (2)
- ETE-NA-2021-0004, Operator Manual Action Strategy for Spurious Discharge of CO2 in Cable Vault & Tunnel During ESGR Fire (1/2-FCA-2)
INSPECTION RESULTS
Unresolved Item URI 2021012-01 for North Anna Power Station Unit 1 and 71111.21 (Open) Unit 2. Following a fire-induced hot short stall event of NAPS N.05 CVCS MOVs, there is uncertainty whether valves' pressure boundary components would be compromised and challenge safe shutdown capability.
URI 05000338,05000339/2021012-01
Description:
Information Notice 92-18, Potential for Loss of Remote Shutdown Capability During a Control Room Fire, stated that fire damage could cause an electrical hot short that bypasses thermal overload protection for MOVs, and that this hot short could result in damage to the valve. North Annas technical evaluation (ETE-CME-2016-0003) demonstrated that certain MOVs in their Unit 1 and Unit 2 Chemical Volume and Control System would be locally and manually operable following a fire-induced spurious event as described in IN 92-18. Because the evaluation only considers operability of the valve following the spurious event, and not any leakage that could result from the MOVs being driven in the open or closed position, the NRC Team requested an analysis to address this aspect of IN 92-18. The licensee stated that stall thrusts generated by the spurious event are conservatively estimated high and that thrust forces generated during an actual fire-induced spurious event would be lower. Additionally, the licensee stated that based on past operating experience presented in ETE-CME-2016-0003, it had been demonstrated that valve pressure boundary components are more robust and would therefore retain their structural integrity. To make a conclusive determination, the NRC Team requested a more thorough analysis demonstrating the licensees position. In response, on 6/15/21, North Anna provided an evaluation, 1114-0093-CALC-001, Evaluation of North Anna Power Station (NAPS) MOV Pressure Boundaries for a Hot-Short Stall Event.
Planned Closure Actions: The NRC Team will review calculation 1114-0093-CALC-001, "Evaluation of North Anna Power Station (NAPS) MOV Pressure Boundaries for a Hot-Short Stall Event", to ensure licensee's evaluation adequately addresses potential for compromise of analyzed MOV pressure boundaries and resulting leakage.
Licensee Actions: The licensee has been provided follow-up questions regarding calculation 1114-0093-CALC-001. The licensee committed to addressing the provided questions and other possible follow-up inquiries following correspondence provided on 6/21/2021.
EXIT MEETINGS AND DEBRIEFS
The inspectors confirmed that proprietary information was controlled to protect from public disclosure.
- On May 13, 2021, the inspectors presented the triennial fire protection inspection results to Mr. Fred Mladen, Site Vice President and other members of the licensee staff.
DOCUMENTS REVIEWED
Inspection Type Designation Description or Title Revision or
Procedure Date
71111.21N.05 Calculations 000-EP-0017 Combustible Loading Analysis NAPS Unit 1 & 2 Rev. 20
71111.21N.05 Calculations ACN 7903260343 Safety Evaluation Supporting Amend 8 to License NPF-4 10/01/1979
RE Implementation of Fire Protection Program
71111.21N.05 Calculations ACN 8611180125 Safety Evaluation Supporting Exemptions from 10 CFR 50 06/11/1986
APP R
71111.21N.05 Calculations NAPS APP R North Anna Power Station Appendix R Report 48
Report
71111.21N.05 Calculations NAPS UFSAR North Anna Power Station Updated Final Safety Analysis 02/18/2021
Report
71111.21N.05 Calculations SDBD-NAPS-FP System Design Basis Document for Fire Protection System 20
North Anna Power Station
71111.21N.05 Corrective Action CA 7868307 3/4/2020
Documents
71111.21N.05 Corrective Action CA 7868308 3/4/2020
Documents
71111.21N.05 Corrective Action CR 019539 Rev. 2
Documents
71111.21N.05 Corrective Action CR 1092157 3/15/2018
Documents
71111.21N.05 Corrective Action CR 1150476 06/25/2020
Documents
71111.21N.05 Corrective Action CR 1156170 09/28/2020
Documents
71111.21N.05 Corrective Action CR 1157092 09/23/2020
Documents
71111.21N.05 Corrective Action CR 1166332 02/23/2021
Documents
71111.21N.05 Corrective Action CR-1129424 Rev. 0
Documents
71111.21N.05 Corrective Action CR1170260 04/15/2021
Documents
71111.21N.05 Corrective Action CR1170330 04/15/2021
Inspection Type Designation Description or Title Revision or
Procedure Date
Documents
71111.21N.05 Drawings 11715-FB-104K Carbon Dioxide Fire Protection Zone Summary Sheet NAPS Rev. 2
Unit 1 & 2
71111.21N.05 Drawings 11715-FE-12E-11 Wiring Diagram Fire Protection LP CO2 System #2 Storage Rev. 11
Tank & Master Valve Drawing.
71111.21N.05 Drawings 11715-FE-69A, Lighting Plan Auxiliary Building - El 244' - 6" Rev. 18
Sheet 1
71111.21N.05 Drawings 12050-DAR- Appendix R Flowpath Chem and Volume Control System Rev. 16
095B, Sheet 1
71111.21N.05 Drawings 12050-DAR- Appendix R Flowpath Chem and Volume Control System Rev. 13
095B, Sheet 2
71111.21N.05 Drawings 12050-DAR- Appendix R Flowpath Chem and Volume Control System Rev. 9
095C, Sheet 1
71111.21N.05 Drawings 12050-DAR- Appendix R Flowpath Safety Injection System Rev. 1
096A, Sheet 1
71111.21N.05 Drawings 12050-DAR- Appendix 'R' Flowpath Safety Injection System Rev. 1
096A, Sheet 3
71111.21N.05 Drawings 12050-FE-1AF 480V One Line Diagram Emergency Busses 2H, 2H1, 2J, Rev. 18
2J1
71111.21N.05 Drawings 12050-FE-1BA Appendix R Electrical One Line Diagram Rev. 16
71111.21N.05 Drawings 12050-FM-304A- Fire Barrier and Pressure Envelope Penetrations-Cable Rev. 3
Tray Rooms
71111.21N.05 Drawings FLHR 17517 LP Cardox Fire Extinguishing Extinguishing System Storage Rev. A
Sheet 11 of 28 Tank Relay Cabinet for System 1 or System 2
71111.21N.05 Drawings FLHR-17517 Cardox LP Fire Extinguishing System Elementary Line
Sheet 18 of 28 Diagram for System # 2
71111.21N.05 Engineering DCN NA-08-0157 Unit 1 Cable Spreading Room Fire Venting 02/17/2009
Changes
71111.21N.05 Engineering CM-AA-ETE-101 Determination of Combustible Loading Fire Area Status 02/15/2021
Evaluations
71111.21N.05 Engineering CM-AA-ETE-101 Combustible Loading Analysis North Anna Power Station, 20
Evaluations Units 1 and 2
71111.21N.05 Engineering EE-0118 10 CFR 50 Appendix R Electrical Distribution System Rev. 4
Evaluations Coordination Study
Inspection Type Designation Description or Title Revision or
Procedure Date
71111.21N.05 Engineering EE-0395 Safety Related 480V Load Center Coordination Rev. 6
Evaluations
71111.21N.05 Engineering EE-0806 NAPS 4160V and 480V Short-Circuit Analysis Rev. 2
Evaluations
71111.21N.05 Engineering ET CEP 00-0043 Availability of MOVs for Local Operation Rev. 0
Evaluations
71111.21N.05 Engineering ET-N-03-004 Evaluation of Fire Door Clearances NAPS Unit 1 & 2 02/10/2003
Evaluations
71111.21N.05 Engineering ET-N-08-0019 Evaluation of Fire Retardant Wrap Applied to Power Cables 04/29/2008
Evaluations for Charging and Component Cooling Water Wraps
71111.21N.05 Engineering ET-N-08-0094 Evaluation of Low Pressure CO2 System Vendor Rev. 1
Evaluations Calculations and Blower door Test
71111.21N.05 Engineering ETE-CEP-00- Penetration Seal Configuration Evaluations Rev. 2
Evaluations 0025
71111.21N.05 Engineering ETE-CEP-2011- Appendix R Multiple Spurious Operation (MSO) Rev. 3
Evaluations 0003 Identification and Evaluation - North Anna Units 1 and 2
71111.21N.05 Engineering ETE-CEP-2017- Work Control Process, License Renewal Aging Rev. 0
Evaluations 1002 Management Activities
71111.21N.05 Engineering ETE-CEP2011- Fire Protection Program- License Renewal Aging Rev. 0
Evaluations 1002 Management Program
71111.21N.05 Engineering ETE-CME-2016- Discussion of the Effects of Stall Thrust for Selected North Rev. 0
Evaluations 0003 Anna Motor Operated Valves Subject to Appendix R
Concerns
71111.21N.05 Engineering ETE-NA-2012- Additional MSO Analysis for Appendix R III.G Fire Areas Rev. 3
Evaluations 0021
71111.21N.05 Engineering ETE-NA-2019- Appendix R Program Implementation of SM-1841, Appendix Rev. 1
Evaluations 0030 R Emergency Switchgear Room (ESGR) Fire Natural
Circulation Cooldown for NAPS
71111.21N.05 Engineering NA-2011-0021 Evaluation of Permanently Stored Combustible Materials Rev.8
Evaluations
71111.21N.05 Miscellaneous CVCS Aging Management Review
71111.21N.05 Miscellaneous 02-96-2253-002 Commitment Document EDG Door Strength with CO2 12/12/1996
Discharge
71111.21N.05 Miscellaneous 59-C195-00002 Vendor Technical Manual Rev. 1
Inspection Type Designation Description or Title Revision or
Procedure Date
Cardox Low Pressure Carbon Dioxide Storage Units
71111.21N.05 Miscellaneous ER-AA-AMP-10 License Renewal Aging Management Program Rev. 4
71111.21N.05 Miscellaneous ER-AA-AMP-101 Implementation of Activities Performed by License renewal Rev. 11
Aging Management Coordinators
71111.21N.05 Miscellaneous NRC Information Potential For Loss of Remote Shutdown Capability During a 2/28/1992
Notice 92-18 Control Room Fire
71111.21N.05 Miscellaneous Technical Report Chemical and Volume Control System Screening Report 5/14/2002
LR-2143
71111.21N.05 Procedures 0-ECM-0204-02 Emergency Power to Pressurizer Vents Rev. 0
71111.21N.05 Procedures 0-EPM-2304-02 RHR and Pressurizer Vents Appendix R Equipment Rev. 16
Inspection
71111.21N.05 Procedures 0-FCA-0 Fire Protection - Operations Response Rev. 22
71111.21N.05 Procedures 0-MPM-0454-21 Inspection and Preventative Maintenance of Fire Dampers Rev. 2
71111.21N.05 Procedures 0-PT-105.1.2 Fire Door Inspection Service Building Rev. 12
71111.21N.05 Procedures 0-PT-105.1.4D Fire Protection System-Fire Barriers Rev. 12
71111.21N.05 Procedures 0-PT-109.1.5 Fire Protection Auxiliary Building and Service Building Cable Rev. 5
Vault and Tunnel Sprinkler System Functional Tests and
Inspections
71111.21N.05 Procedures 2-FCA-2 Emergency Switchgear Room Fire Rev. 43
71111.21N.05 Procedures 2-FCA-3 Cable Vault and Tunnel Fire Rev. 35
71111.21N.05 Procedures 2-FCA-4 Auxiliary Building Fire Rev. 22
71111.21N.05 Procedures CM-AA-FPA-100 Fire Protection/Appendix R (Fire Safe Shutdown) Program 5
71111.21N.05 Procedures CM-AA-FPA-101 Control of Combustible and Flammable Materials 14
71111.21N.05 Procedures CM-AA-FPA-102 Fire Protection and Fire Safe Shutdown Review and 10
Preparation Process and Design Change Process
71111.21N.05 Procedures ER-AA-AMP-103 Scoping and Screening of License Renewal Aging Rev. 0
Management Components
71111.21N.05 Procedures ER-AA-AMP-104 Aging Management Review for License Renewal Systems, Rev. 0
Structures, and Components
71111.21N.05 Procedures ER-AA-AMP-106 Aging Management Programs for License Renewal Rev. 0
Systems, Structures, and Components
71111.21N.05 Work Orders 2-PT-100 Appendix R Equipment and Circuitry Functional Test Completed
10/13/2020
71111.21N.05 Work Orders 2-PT-214.15 Auxiliary Shutdown Panel Controls Verification Completed
Inspection Type Designation Description or Title Revision or
Procedure Date
10/14/2020
71111.21N.05 Work Orders WO 0-PT-105.1.4.D Fire Protection System Fire Barriers 01/13/2020
59102279119
71111.21N.05 Work Orders WO 1-PT-105.3.2 Fire Extinguisher and Hose Station Inspection 04/02/2021
203130341 Reactor Containment
71111.21N.05 Work Orders WO 2-PT-105.3.2 Fire Extinguisher and Hose Station Inspection 05/04/2020
203279300 Reactor Containment
71111.21N.05 Work Orders WO 0-PT-105.1.2 Fire Door Inspection Service Building 11/02/2020
203291261
71111.21N.05 Work Orders WO 2-PT-102.1 Low Pressure CO2 Total Flooding Zones 03/11/2021
2032961191 Functional Test and Puff Test
10