IR 05000336/2018001

Integrated Inspection Report 05000336/2018001 and 05000423/2018001

ML18124A023
Person / Time
Site:	Millstone
Issue date:	05/03/2018
From:	Daniel Schroeder Reactor Projects Branch 2
To:	Stoddard D Dominion Energy Nuclear Connecticut, Dominion Energy
Schroeder D
References
IR 2018001
Download: ML18124A023 (20)

Text

D. UNITED STATES NUCLEAR REGULATORY COMMISSION REGION I 2100 RENAISSANCE BOULEVARD, SUITE 100 KING OF PRUSSIA, PENNSLYVANIA 19406-2713

May 3, 2018 Mr. Daniel Senior Vice President and Chief Nuclear Officer

Dominion Energy, Inc. Innsbrook Technical Center 5000 Dominion Blvd.

Glen Allen, VA 23060-6711

SUBJECT: MILLSTONE POWER STATION - INTEGRATED INSPECTION REPORT 05000336/2018001 AND 05000423/2018001

Dear Mr. Stoddard:

On March 31, 2018, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Millstone Power Station (Millstone), Units 2 and 3. On April 4, 2018, the NRC inspectors discussed the results of this inspection with Mr. John Daugherty, Site Vice President, and other members of your staff. The results of this inspection are documented in the enclosed report.

No NRC-identified or self-revealing findings 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 the NRC Public Document Room in accordance with Title 10 of the Code of Federal Regulations (10 CFR), Part 2.390, "Public Inspections, Exemptions, Requests for Withholding."

Sincerely,

/RA/ Daniel L. Schroeder, Chief

Reactor Projects Branch 2 Division of Reactor Projects Docket Nos. 50-336 and 50-423 License Nos. DPR-65 and NPF-49

Enclosure:

Inspection Report 05000336/2018001 and 05000423/2018001

Inspection Report

Docket Numbers: 50-336 and 50-423

License Numbers: DPR-65 and NPF-49

Report Numbers: 05000336/2018001 and 05000423/2018001

Licensee: Dominion Energy Nuclear Connecticut, Inc. (Dominion)

Facility: Millstone Power Station, Units 2 and 3

Location: P.O. Box 128 Waterford, CT 06385

Inspection Dates: January 1 to March 31, 2018 Inspectors: J. Fuller, Senior Resident Inspector L. McKown, Resident Inspector C. Highley, Resident Inspector H. Anagnostopoulos, Senior Health Physicist J. Brand, Reactor Inspector

Approved By: Daniel L. Schroeder, Chief Reactor Projects Branch 2 Division of Reactor Projects

2

SUMMARY

The U.S. Nuclear Regulatory Commission (NRC) continued monitoring Dominion's performance at Millstone Units 2 and 3 by conducting the baseline inspections described in this report in accordance with the Reactor Oversight Process. The Reactor Oversight Process is the NRC's program for overseeing the safe operation of commercial nuclear power reactors. Refer to https://www.nrc.gov/reactors/operating/oversight.html for more information. Licensee-identified non-cited violations are documented in report section 71153.

No findings or more-than-minor violations were identified.

Additional Tracking Items Type Issue number Title Report Section Status LER 05000336/2016-001-00 Turbine Driven Auxiliary Feedwater Pump Room HELB Door Left Open 71153 Closed 3

PLANT STATUS

Unit 2 and 3 operated at or near rated thermal power for the entire inspection period.

===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 performed plant status activities described in IMC 2515, Appendix D, "Plant Status," and conducted routine reviews using IP 71152, "Problem Identification and Resolution." The inspectors reviewed selected procedures and records, observed activities, and interviewed personnel to assess Dominion Energy's performance and compliance with Commission rules and regulations, license conditions, site procedures, and standards.

71111.01 - Adverse Weather Protection

Impending Severe Weather

The inspectors evaluated readiness for impending adverse weather conditions for the onset of a severe storm with heavy snow and high winds on January 3, 2018.

The inspectors evaluated readiness for impending adverse weather conditions for a winter storm watch on March 6, 2018.

71111.04 - Equipment Alignment

Partial Walkdown

The inspectors evaluated system configurations during partial walkdowns of the following systems/trains at Unit 3:

(1) 'B' emergency diesel generator (EDG) air start system on January 22, 2018

(2) Charging system with both 'A' and

'B' pumps in service on January 31, 2018

(3) Control building chiller service water booster pump trains on February 6, 2018

(4) Auxiliary feedwater injection lines on February 12, 2018

(5) 'A' steam generator feedwater regulating bypass valve operator and control circuit on March 27, 2018

71111.05A/Q - Fire Protection Annual/Quarterly

Quarterly Inspection

The inspectors evaluated fire protection program implementation in the following selected

areas:

Unit 2

(1) Fire areas T-3 (motor driven auxiliary feedwater pump room) and T-4 (steam driven auxiliary feedwater pump room) on January 24, 2018

(2) Fire area A-21, west direct current switchgear room on January 26, 2018

(3) Fire area A-15 and A-16, 'A' and 'B' EDG rooms on February 2, 2018

(4) Fire area T-10, upper vital switchgear room on February 8, 2018 Unit 3

(5) Fire area ESF-5, SE floor area auxiliary feed pump cubicle [21'6"] on January 10, 2018

(6) Fire area CB-8, cable spreading area on January 23, 2018

(7) Fire area FB-1, fuel building elevation 11' pipe chase / pipe tunnel pit on January 29, 2018

71111.06 - Flood Protection Measures

Cables

The inspectors evaluated cable submergence protection in:

(1) Unit 3 north and south cable tunnels on January 23, 2018

71111.11 - Licensed Operator Requalification Program and Licensed Operator Performance

Operator Requalification

The inspectors observed and evaluated Unit 2 operator requalification training on reactor coolant system (RCS) leak (AOP-2568), reactor coolant pump malfunctions (AOP-2586), rapid downpower (AOP-2575), immediate operator actions (AOP-2585), reactor trip (EOP-2525), reactor trip recovery (EOP-2526), RCS leak rate calculation, condensate pump trips, heater drain pump trips, and feed water heater tube leak on February 6, 2018.

The inspectors observed and evaluated Unit 3 control room simulator licensed operator requalification training including a small break loss of coolant accident, rapid downpower, and nuclear instrument failure, and verified completion of risk significant operator actions, including the use of alarm response, abnormal, and emergency operating procedures on

February 13, 2018 Operator Performance (2 Samples)===

The inspectors observed Unit 2 operator performance on plant downpower, turbine valve testing, annunciator response procedure usage for various turbine control alarms, and control room rounds on January 19, 2018.

===The inspectors observed Unit 3 operator performance during 'B' EDG endurance surveillance testing, emergency generator logic sequencer auto test failure and manual re-test, failure and restoration of power range channel 41, and a medical emergency on February 20, 2018.

71111.12 - Maintenance Effectiveness

Routine Maintenance Effectiveness

The inspectors evaluated the effectiveness of routine maintenance activities associated with the following equipment and/or safety significant functions:

Unit 2

(1) 'B' direct current switchgear room chiller (Vital Chiller) maintenance on January 23, 2018

(2) Radiation monitor failures on February 1, 2018 Unit 3

(3) 'B' EDG air start system on January 22, 2018

(4) Charging pump seal leakage on January 31, 2018

(5) Control building chiller service water booster pump trains on February 6, 2018

(6) Auxiliary feed water injection lines on February 12, 2018

71111.13 - Maintenance Risk Assessments and Emergent Work Control

===

The inspectors evaluated the risk assessments for the following planned and emergent work activities:

Unit 2

(1) 'B' EDG inoperable due to low oil temperature increased risk associated with other scheduled work on January 12, 2018

(2) Elevated risk due to charging and letdown outage required to perform replacement and calibration of M2LY-110Q, I to P converter, on January 18, 2018

(3) Functional testing of the steam generator level and auto auxiliary feedwater initiation logic potential Yellow risk window on February 12, 2018

(4) Auxiliary feedwater testing with potential for causing a Yellow risk window on February 13, 2018 Unit 3

(5) 'A' turbine driven feed pump overspeed trip push button restoration on January 31, 2018

(6) Offsite line 310 outage concurrent with deep downpower first contingency to support offsite grid maintenance on February 9, 2018

(7) Procedurally controlled high risk plan for the manual performance of 'B' train emergency generator logic sequencer testing on February 20, 2018

(8) Line 348 outage and single output breaker operation on March 29, 2018

71111.15 - Operability Determinations and Functionality Assessments

The inspectors evaluated the following operability determinations and functionality assessments:

Unit 2

(1) CR1078830 - through wall leakage in emergency core cooling system recirculation piping to refueling water storage tank on January 12, 2018

(2) 'B' EDG keep warm pump relay failure for oil temperatures on January 16, 2018

(3) Channel 'C' reactor protection system pre-trip light on January 24, 2018

(4) Indication of possible over power condition due to leading edge flow meter and total venturi flow mismatch on January 30, 2018 Unit 3

(5) Reactor plant chilled water system containment isolation valves possible inadequate closing force operability determination and six month periodic review on January 11, 2018

(6) CR1087819 - steam generator back leakage into auxiliary feedwater on January 11, 2018

(7) CR1088497 - 'B' EDG air start system on January 22, 2018

(8) CR1090807 - additional purging performed during monthly 'A' EDG fuel oil storage tank dewatering on February 27, 2018

71111.18 - Plant Modifications

The inspectors evaluated the following temporary modification:

(1) Unit 3 alternate plant configuration (temporary modification) of charging 'A' and 'C' pumps to support 'A' seal troubleshooting on February 26, 2018

71111.19 - Post Maintenance Testing

The inspectors evaluated post maintenance testing for the following maintenance/repair

activities:

Unit 2

(1) Shim switch failure on January 11, 2018

(2) 'B' EDG keep warm pump relay failure on January 16, 2018

(3) M2LY-110Q, I to P converter associated with chemical and volume control system, on January 18, 2018

(4) 'B' train control room air conditioning unit 2A instrumentation calibration (removal and installation) and compressor inspection on January 22, 2018

(5) 'B' direct current switchgear room chiller (Vital chiller) after failure to start on January 24, 2018

(6) Replacement of SI-647 relay (high pressure safety injection isolation valve) on February 12, 2018 Unit 3

(7) Normal station service transformer to bus 34B seismic door replacement on January 23, 2018

(8) 'B' EDG air compressors following troubleshooting and maintenance associated with inability to restore starting air flasks to normal standby pressure on January 23, 2018

(9) 'D' steam generator level instrument bistable card on February 9, 2018

(10) Power range nuclear instrument channel 41 power supply failure and restoration on February 20, 2018

(11) 'A' wide range containment sump level indication troubleshooting and calibration on February 21, 2018

71111.22 - Surveillance Testing

The inspectors evaluated the following surveillance tests:

Routine===

(1) Unit 2 'A' EDG monthly surveillances with a slow start on January 3, 2018

(2) Unit 2 main control valve, main stop valve, and combined intermediate valve operability test on January 19, 2018

(3) Unit 2 functional test of S/G level and auto auxiliary feedwater initiation logic on February 12, 2018

(4) Unit 2 auxiliary feedwater valve testing on February 13, 2018

(5) Unit 3 auxiliary feedwater pump 3FWA*P2 operational readiness test on January 10, 2018

(6) Unit 3 SP 3612B.5, Primary Coolant Leakage Outside Containment - Summary Sheet on January 31, 2018

(7) Unit 3 SP 3646A.2-006, Emergency Diesel Generator B 24 Hour Run and Restart, Revision 002, performed February 20-21, 2018

(8) Unit 3 'C' SP 600.5, QA Diesel Fuel Oil Delivery Post - Offload Results on February 28, 2018 Inservice (2 Samples)===

(1) Unit 2 turbine driven auxiliary feedwater pump quarterly operational testing, MS-V201, V202, and V464 valve stroke and timing tests on January 24, 2018

(2) Unit 3 SP 3626.10-001, motor control center and rod control booster pump 3SWP*P3A

===group B test on February 7, 2018

71114.06 - Drill Evaluation

Emergency Planning Drill

The inspectors evaluated the conduct of a routine Unit 3 emergency planning drill on February 28, 2018.

Drill/Training Evolution (1 Sample)===

The inspectors evaluated licensed operator requalification training, including a drill and exercise performance classification opportunity, at Unit 3 on January 9, 2018.

71124.02 - Occupational As Low As Reasonably Achievable (ALARA) Planning and Controls

Radiological Work Planning

The inspectors evaluated Dominions radiological work planning by reviewing the following activities:

(1) ALARA Plan AP-2-17-01

(2) ALARA Plan AP-2-17-02

(3) ALARA Plan AP-2-17-13

(4) ALARA Plan AP-3-17-03

(5) ALARA Plan AP-3-17-11

(6) ALARA Plan AP-3-18-01

Verification of Dose Estimates and Exposure Tracking Systems (1 Sample)===

The inspectors reviewed the current annual collective dose estimate; basis methodology; and measures to track, trend, and reduce occupational doses for ongoing work activities.

The inspectors evaluated the adjustment of exposure estimates or replanning of work. The

inspectors reviewed post-job ALARA evaluations.

OTHER ACTIVITIES - BASELINE

71151 - Performance Indicator Verification The inspectors verified licensee performance indicators submittals listed below for the period from January 2017 through December 2017.

Unit 2

(1) RCS specific activity

(2) RCS identified leak rate Unit 3

(3) RCS specific activity

(4) RCS identified leak rate

71152 - Problem Identification and Resolution

Annual Follow-up of Selected Issue

The inspectors reviewed the licensee's implementation of its corrective action program related to the following issue:

(1) Continued failures (trips) of the Unit 3 control building chillers (nine failures of the 'A' chiller and three failures of the 'B' chiller) since implementation of corrective actions for multiple failures of the Unit 3 'A' chiller in 2014.

===71153 - Follow-up of Events and Notices of Enforcement Discretion

Licensee Event Reports ===

The inspectors evaluated the following licensee event reports which can be accessed at https://lersearch.inl.gov/LERSearchCriteria.aspx

(1) Licensee Event Report (LER) 2016-001-00, Turbine Driven Auxiliary Feedwater Pump Room HELB [High Energy Line Break] Door Left Open on April 27, 2016.

INSPECTION RESULTS

Observations Annual Follow-up of Selected Issues 71152 The inspectors assessed Dominion's problem identification threshold, assessment and operability determinations for each of the identified issues, maintenance rule applicability, extent of condition reviews, and the prioritization and timeliness of corrective actions to determine whether Dominion staff was appropriately identifying, characterizing, and correcting problems associated with the chillers and whether the corrective actions were appropriate.

The prior failures in 2014 involved a failed card, several loose and/or broken connections and an unexpected loose soldered connection (vice crimped), and spurious electrical signal spikes on the bearing temperature module. The inspectors determined these conditions have not recurred; and the subsequent failures have been properly evaluated and adequate corrective actions have been completed and/or planned. Specifically, for each of the chiller failures since 2014, Dominion conducted the appropriate level of cause evaluation and properly identified and implemented appropriate applicable corrective actions. Included in these corrective actions were developing modifications for both chillers to prevent spurious electrical signal spike trips and for replacing the existing electromechanical timers with solid state timers. Dominion also reviewed preventive maintenance activities and adjusted specific activity frequencies to enhance the service life of the components.

Licensee Event Report (Closed)

Turbine Driven Auxiliary Feedwater Pump Room HELB [High Energy Line Break] Door Left Open on April 27, 2016

LER 2016-001-00 71153

Description:

On April 27, 2016, with Millstone Power Station Unit 2 in MODE 1 at 100% power, plant personnel inadvertently left the door to the turbine driven auxiliary feed purnp room open. This condition existed for less than one hour. The door is a high energy line break (HELB) barrier. With the door open there was no HELB protection for the motor driven auxiliary feedwater pumps thus potentially rendering both trains of auxiliary feedwater inoperable. The licensee determined that the cause was human performance error. The door is conspicuously labeled on each side that it is a HELB boundary door and must be closed except for entry and exit from the room. Corrective actions were taken in accordance with the station's corrective action program, and condition report 1035792 was initiated to address this issue.

Closure Basis: The inspectors determined that Dominion's immediate actions to close the HELB door and subsequent corrective actions that created a computer based training, assigned to current and future contractor personnel, to reinforce the requirements associated with HELB doors were adequate. The inspectors determined that the failure to close and latch the HELB door represented a Green licensee identified violation of 10 CFR Part 50, Appendix B, Criterion V. This Green licensee identified violation is documented under Inspection Results in Millstone's IR2018001. The inspectors did not identify any new issues during the review of the LER. This LER is closed.

Licensee Identified Non-Cited Violation 71153 This violation of very low safety significant was identified by the licensee and has been entered into the licensee's corrective action program and is being treated as a non-cited violation, consistent with Section 2.3.2 of the Enforcement Policy. Violation: 10 CFR Part 50, Appendix B, Criterion V, "Instructions, Procedures, and Drawings," requires that "activities affecting quality shall be prescribed by documented instructions, procedures, or drawings, of a type appropriate to the circumstances and shall be accomplished in accordance with these instructions, procedures, or drawings."

Section 4.4 of Operating Procedure 2356, "Doors," Revision 004, states in part, "site personnel are responsible for ensuring doors [high energy line break boundary doors] are closed and latched after passage."

Contrary to the above, between 7:10 pm and 8:07 pm on April 27, 2016, with Millstone Unit 2 in Mode 1 at 100 percent power, Dominion personnel failed close and latch the HELB barrier door between the steam driven and motor driven auxiliary feedwater pumps, which rendered both trains of auxiliary feedwater inoperable for approximately 57 minutes.

Significance/Severity Level: The inspectors evaluated this finding using IMC 0609.04, "Initial Characterization of Findings," and IMC 0609, Appendix A, Exhibit 2, "Mitigating Systems Screening Questions." The inspectors determined that the finding was of very low safety significance (Green).

Corrective Action Reference: CR 1035792

EXIT MEETINGS AND DEBRIEFS

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

On April 4, 2018, the inspectors presented the quarterly resident inspector inspection results to Mr. John Daugherty, Site Vice President, and other members of the Millstone staff.

DOCUMENTS REVIEWED

71111.01 - Adverse Weather Protection

Miscellaneous Surveillance Form SP 3665.2-001, Intake Structure Condition Determination with Vacuum in

Condenser, dated March 6, 2018 Surveillance Form SP 2654R-001, Intake Structure Condition Determination (With Vacuum in

Condenser), dated March 6, 2018

71111.04 - Equipment Alignment

Procedures OP 3304A, Charging and Letdown SP 3604A.1, Charging Pump 'A' Operational Readiness Test, Revision 017 SP 3612B.5, Primary Coolant Leakage Outside Containment - Summary Sheet, Revision 001-

01, performed January 31, 2018 SP 3604A.1, Charging Pump 'A' Leaktightness Verification Check, Revision 005-04, performed

January 31, 2018 SP 3626.10-001, Motor Control Center and Rod Control Booster Pump 3SWP*P3A Group B

Test, Revision 012-01

Condition Reports CA3100943 CA3114923 1068440 1087819

1088497 1088897 1090041 1090044

1090717

Maintenance Orders/Work Orders 53103053362 53103079863 53103084426 53103104435

53103108717 53203153366

Miscellaneous 25212-26916, Sheet 4, PID 'B' Emergency Diesel Generator Air Start System, Revision 20

3C19-CHS01-0002, Alternate Plant Configuration for Isolation of 'A' Charging Pump due to Seal

Leakage 25212-26904, Sheet 1, PID Charging and Letdown System, Revision 54 25212-26933, Sheet 2, PID Service Water System, Revision 90 25212-26933, Sheet 4, PID Service Water System, Revision 54

212-26930, Sheet 2, PID 'B' Auxiliary Feedwater System, Revision 49

212-26930, Sheet 3, PID Feed Water System, Revision 30

71111.05 - Fire Protection

Procedures MP-PROC-ENG-U3-24-FFS-BAP01-ESF-MAP, Revision 0

Millstone Unit 2 Fire Fighting Strategy for Fire Areas: T-10, 13, and 14

Miscellaneous U3-24-FFS, Millstone Unit 3 Fire Fighting Strategies, Revision 0 Millstone Unit 3 Fire Protection Evaluation Report, Revision 21.3

71111.06 - Flood Protection Measures

Condition Reports CA277474 1087853

Miscellaneous ETE-MP-2015-1057, Condition Monitoring of Structures, Revision 0

71111.11 - Licensed Operator Requalification Program

Procedures SP 2651M, Combined Intermediate Valves Operability Test, Revision 005

SP 2651L, Main Stop Valve Operability Test, Revision 004-01

SP 2651N, Main Control Valve Operability Test, Revision 007

OP 2204, Load Changes, Revision 038 SP 2651L-002, Quarterly Main Stop Valve Operability Test, Revision 002

SP 2651M-002, Combined Intermediate Valves Operability Test, Revision 002

SP 2651N-001, Main Control Operability Test, Revision 003-01

AOP 2585, Immediate Operator Actions, Revision 003-00 AOP 2568, Reactor Coolant System Leak, Revision 016 AOP 2575, Rapid Down Power, Revision 010-00

EOP 2526, Reactor Trip Recovery, Revision 019-00

EOP 2525, Standard Post Trip Action, Revision 028-00

AOP 2586, RCP Malfunctions, Revision 004

SP 3448E41, Train B - Diesel Sequencer Actuation Logic Test, Revision 006-01 SP 3646A.2, Emergency Diesel Generator B Operability Test, Revision 025

Work Orders 53102961788 53103112699 53203157223

Condition Reports 1088243 1088260 1088261 1090369 1090404 1090469

Miscellaneous ER-AA-RXE- Attachment 4, Reactivity Plan, Dated January 19, 2018 LORP program # S18103, Simulator Exercise Guide Minimum manning/Secondary Malfunctions course # 70260 LORP program # S18102, Simulator Exercise Guide RCS Leak AOP-2568 course # 70160

71111.12 - Maintenance Effectiveness

Procedures SP 3626.10-001, Motor Control Center and Rod Control Booster Pump 3SWP*P3A Group B

Test, Revision 012-01 SP 3604A.1, Charging Pump 'A' Operational Readiness Test, Revision 017

Work Orders 53102987484 53103053362 53103079863 53103084426 53103104183 53103104435 53103108717 53203153366

Condition Reports CA3064516 CA3040023 CA3114923 CA3100943 1068440 1087819 1088497 1088897 1090041 1090044 1090717

Miscellaneous Failure report number 361 for 'B' DC SWGR room chiller, dated March 21, 2002

Radiation monitors Maintenance Rule Evaluations (MRE) Unit 2, since January 1 2016

212-26933, Sheet 2, PID Service Water System, Revision 90 25212-26933, Sheet 4, PID Service Water System, Revision 54 3C19-CHS01-0002, Alternate Plant Configuration for Isolation of 'A' Charging Pump due to Seal

Leakage 25212-26904, Sheet 1, PID Charging and Letdown System, Revision 54

212-26916, Sheet 4, PID 'B' Emergency Diesel Generator Air Start System, Revision 20 25212-26930, Sheet 2, PID 'B' Auxiliary Feedwater System, Revision 49

71111.13 - Maintenance Risk Assessments and Emergent Work Control

Procedures IC2418D1, Setting Letdown Limiter LLM - 110 High and Low Limit Setpoints, Revision 001-03

C IC 400.05-002, Instrument/Loop Calibration Testing Guidelines, dated January 14, 2013

SP 2610CO, AFW system lineup, valve operability and operational readiness tests, operating, Revision 001 SP 2610CO-002, 2-FW-43A and 2-FW-43B Failure mode and stroke time IST, Revision 001

SP 2610CO-001, Auxiliary feedwater flow path lineup verification, Revision 001 SP 2402M, Functional test of steam generator level and auto-aux. feedwater initiation logic, Revision 011 SP 3621.4, Main Feedwater Turbine Emergency Governor and Trip Lockout Test, Revision 001

SP 3448E41, Train B - Diesel Sequencer Actuation Logic Test, Revision 006-01

Condition Reports 1086031 1090369 1090404 1090469

Work Orders 53102961788 53103112699 53203149868 53203157223

Miscellaneous Medium Risk Plan for CR1086138 dated January 17, 2018 Operator risk report unit 2 dated February 13, 2018

Operator risk report unit 2 dated February 12, 2018

WO# TMC80101 EOOS Version 4.1 for Millstone Unit 3 on February 9, 2018 EOOS Version 4.1 for Millstone Unit 3 on March 29, 2018

High Risk Plan, Eversource TOA 18-00852 and 18-00768

EOOS Version 4.1 for Millstone Unit 3 on January 31, 2018

EOOS Version 4.1 for Millstone Unit 3 on February 20, 2018

71111.15 - Operability Determinations and Functionality Assessments

Procedures

ER-M2-THM-201 attachment 1, Feed flow correction factor determination, Revision 0

ER-M2-THM-201, Determining feed flow correction factors for MP Unit 2, Revision 0

EN 21002, Core Heat Balance, Revision 017

SP 2601D-001, Power range channel and delta T power channel calibration, Revision 016-01

C SP 600.5, QA Diesel Fuel Oil Delivery Post - Offload Results, Revision 003, performed

February 28, 2018

Condition Reports CA3061625 CA3114923 CA3100943 1078830

1087718 1087785 1087819 1088497 1088558 1088839 1089030 1090041 1090044 1090807

Maintenance Orders/Work Orders 53203152143 53203153366

Miscellaneous Periodic review of OD CR1073242/CA3061625 dated January 11, 2018

Prompt operability determination documentation for CR1073242 dated July 14, 2017

P&ID 6822-34868A, Reactor Protective System Bistable Trip Unit Schematic, Revision dated December 1, 2004 Unit 2 Control room narrative logs, dated January 25, 2018 Unit 2 Control room narrative logs, dated March 2, 2018

Unit 2 Control room narrative logs, dated February 5-8, 2018

Unit 2 Control room narrative logs, dated January 30, 2018

212-26916, Sheet 4, PID 'B' Emergency Diesel Generator Air Start System, Revision 20 ETE-MP-2017-1144, Code Case N-513-3 Limit Load Planer Flaw Evaluation on Line 6"-HCD-3, Return to RWST, Revision 0 25203-26015, PID

L.P. Safety Injection System, Revision 50

71111.18 - Plant Modifications

Procedures SP 3612B.5, Primary Coolant Leakage Outside Containment - Summary Sheet, Revision 001-

01, performed January 31, 2018 SP 3604A.1, Charging Pump 'A' Leaktightness Verification Check, Revision 005-04, performed

January 31, 2018

Condition Reports 1088897 1090717

Miscellaneous 3C19-CHS01-0002, Alternate Plant Configuration for Isolation of 'A' Charging Pump due to Seal

Leakage 25212-26904, Sheet 1, PID Charging and Letdown System, Revision 54

71111.19 - Post-Maintenance Testing

Procedures SP 3447B01A-001R, Containment Sump Wide Range Level Rack Channel Calibration Train A, Revision 000, performed February 12, 2018 SP 3441A10, Power Range Neutron Flux Monitor 41 Channel Calibration, Revision 004

Condition Reports CA3114923 565360 1087675 1087718 1088410 1088418 1088497 1089726 1089754 1089767 1090369 1090404

Maintenance Orders/Work Orders 53102748541 53102756227 53102916491 53102987484 53103104183 53103123688 53203149868 53203152142 53203152143 53203153366 53203156607 53203156690

203156704 53203157223

Miscellaneous Trouble shooting plan for CR 1087675 M2 Control Element Drive System (CEDS), dated

January 11, 2018 Failure report number 361 for 'B' DC SWGR room chiller, dated March 21, 2002

P&ID 25203-39045 SH 78, Rear Panel Wiring Diagram Engineered Safeguards Section CO-1, Revision 17 25212-26916, Sheet 4, PID 'B' Emergency Diesel Generator Air Start System, Revision 20

71111.22 - Surveillance Testing

Procedures SP 2610BO-004, Auxiliary Feedwater Pump Turbine Trip Throttle Valve Exercise Test, Revision

2 SP 2610BO-002, Turbine Driven Auxiliary Feedwater Pump and Recirculation Check Valve In-Service Inspection Testing (IST), Revision 002 SP 2610BO-001, 2-MS-201, 2-MS-202, and 2-MS-464 (SV-4188) Stroke and Timing In-Service Inspection Testing (IST), Revision 002 SP 2651M, Combined Intermediate Valves Operability Test, Revision 005 SP 2651L, Main Stop Valve Operability Test, Revision 004-01 SP 2651N, Main Control Valve Operability Test, Revision 007

OP 2204, Load Changes, Revision 038

ER-AA-RXE- Attachment 4, Reactivity Plan, Dated January 19, 2018

SP 2651L-002, Quarterly Main Stop Valve Operability Test, Revision 002 SP 2651M-002, Combined Intermediate Valves Operability Test, Revision 002 SP 2651N-001, Main Control Operability Test, Revision 003-01

CM-M2-STI-101, Millstone Unit 2 Technical Specification Surveillance Test Interval (STI0 List, Revision 7 SP 3622.3, Auxiliary Feedwater Pump 3FWA*P2 Operational Readiness Test, Revision 027

SP 3622.3-001 Surveillance Form - TDAFW Pump Operational Readiness and Quarterly IST Group B Pump Tests, dated January 10, 2018 SP 2619G, AC Electrical Sources Inoperability, Revision 005

SP 2613K, Diesel Generator Slow Start Operability Test Facility 1, Revision 007

SP 2670, Saltwater Cooled HX D/P Determination, Revision 016

OP 2346A, 'A' Emergency Diesel Generator, Revision 034 OP 2346A-002, 'A' DG Pre-start Checklist, Revision 021

OP 2346A-004, 'A' DG Data Sheet, Revision 024-03 SP 2613K-001, Periodic DG Slow Start Operability Test, Facility 1 (Loaded Run), Revision 005 SP 2670-004, Diesel Generator 'A' HX D/P Determination, Revision 001-05

OP 2346A-009, 'A' DG Air Roll, Revision 000-04

SP 2619G-002, TS 3.8.1.1.b - One EDG Inoperable, Revision 002-01

SP 2610CO, AFW System Lineup, Valve Operability and Operational Readiness Tests, Operating, Revision 001 SP 2610CO-002, 2-FW-43A and 2-FW-43B Failure Mode and Stroke Time IST, Revision 001 SP 2610CO-001, Auxiliary Feedwater Flow Path Lineup Verification, Revision 001

SP 2402M, Functional Test of Steam Generator Level and Auto-Aux. Feedwater Initiation Logic, Revision 011 SP 3646A.2, Emergency Diesel Generator 'B' Operability Test, Revision 025 SP 3604A.1, Charging Pump 'A' Operational Readiness Test, Revision 017

Work Orders 53102961788 53103053362 53103079863 53103084426

53103096824 53103104435 53103104903 53103104933 53103104942 53103108717 53103112699 53203157223

Condition Reports 1068440 1088243 1088260 1088261

1088557 1088897 1090369 1090404

1090469 1090717 1090807

Miscellaneous ER-AA-RXE- Attachment 4, Reactivity Plan, Dated January 19, 2018

212-26933, Sheet 2, PID Service Water System, Revision 90

212-26933, Sheet 4, PID Service Water System, Revision 54

71114.06 - Drill Evaluation

Miscellaneous EP-AA-103 Attachment 3, Classification Opportunity, for LORTSE55 on January 9, 2018

SERO Log Sheet, dated February 28, 2018 Drill Incident Response Forms EOF Protective Action Recommendations for Drill dated February 28, 2018

Unit 3 Rehearsal Drill Objectives and Critique dated February 28, 2018

71151 - Performance Indicator Verification

Procedures SP 3601F.6, Reactor Coolant System Water Inventory Measurement, Revision 008-00

SP 3855, Reactor Coolant Analysis for Dose Equivalent, Rev. 8

SP3670.1, Mode 1-4 Daily and Shiftly Control Room Rounds

SP 2602A, Reactor Coolant Leakage, Revision 10 C OP 200.15, RCS Leakage Trending and Investigation, Revision 3

SP 2619A, Control Room Daily Surveillance, Mode 1 & 2, Revision 56

Surveillance Test Reports SP3855-001, Reactor Coolant Analysis for Dose Equivalent I-131, dated December 4, 2017 SP3855-001, Reactor Coolant Analysis for Dose Equivalent I-131, dated October 9, 2017 SP3855-001, Reactor Coolant Analysis for Dose Equivalent I-131, dated September 11, 2017

Miscellaneous 2017 Monthly Leakage Spreadsheet for Units 2 and 3

2017 RCS Activity Spreadsheet for Units 2 and 3

71152 - Problem Identification and Resolution

Condition Reports 570737 571897 578532 1001480 1005259 1044700 1054758 1057865 1057896 1073086 1076228 1083510

Miscellaneous ACE 019884, Green NCV Finding 3HVK*CHL1A Chiller Trips, September 26, 2014 -

December 13, 2014, Revision 0 CA3004488, Root Cause Evaluation, CR1005259, Significant Level 2 Multiple Unit 3 'A' Control Building Chiller Trips, dated September 11, 2015 ETE-MP-2017-1009, Classification of MPS Systems Using the Tiered Approach to System Selection, Revision 0

Modification MP3-15-01158, Chiller M33HVK*CHL 1B Bearing and Motor Module Time Delay, January 13, 2016

Work Orders 53102695494 53102906138

71153 - Follow-up of Events and Notices of Enforcement Discretion

Procedures

OP 2356, Doors, Revision 004

Condition Reports

CR1035792 Apparent Cause Evaluation #3030473 (2016)

Apparent Cause Evaluation #019415 (2013)

D. UNITED STATES NUCLEAR REGULATORY COMMISSION REGION I 2100 RENAISSANCE BOULEVARD, SUITE 100 KING OF PRUSSIA, PENNSLYVANIA 19406-2713

May 3, 2018

Mr. Daniel G. Stoddard

Senior Vice President and Chief Nuclear Officer

Dominion Energy, Inc. Innsbrook Technical Center 5000 Dominion Blvd.

Glen Allen, VA 23060-6711

SUBJECT: MILLSTONE POWER STATION - INTEGRATED INSPECTION REPORT

05000336/2018001 AND 05000423/2018001

Dear Mr. Stoddard:

On March 31, 2018, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection

at Millstone Power Station (Millstone), Units 2 and 3. On April 4, 2018, the NRC inspectors discussed the results of this inspection with Mr. John Daugherty, Site Vice President, and other members of your staff. The results of this inspection are documented in the enclosed report.

No NRC-identified or self-revealing findings 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 the NRC Public Document Room in accordance with Title 10 of the Code of Federal Regulations (10 CFR), Part 2.390, "Public Inspections, Exemptions, Requests for Withholding."

Sincerely,

/RA/ Daniel

L. Schroeder, Chief

Reactor Projects Branch

Division of Reactor Projects

Docket Nos. 50-336 and 50-423

License Nos. DPR-65 and NPF-49

Enclosure: Inspection Report 05000336/2018001 and 05000423/2018001

cc w/encl: Distribution via ListServ

ML18124A023

SUNSI Review

Non-Sensitive Sensitive

Publicly Available Non-Publicly Available

OFFICE RI/DRP RI/DRP RI/DRP NAME JFuller via telecom TSetzer/DSchroeder for DSchroeder DATE 5/3/18 5/3/18 5/3/18

Enclosure U.S. NUCLEAR REGULATORY COMMISSION

Inspection Report

Docket Numbers: 50-336 and 50-423

License Numbers: DPR-65 and NPF-49

Report Numbers: 05000336/2018001 and 05000423/2018001

Licensee: Dominion Energy Nuclear Connecticut, Inc. (Dominion)

Facility: Millstone Power Station, Units 2 and 3

Location:

P.O. Box 128 Waterford, CT 06385

Inspection Dates: January 1

to March 31, 2018

Inspectors:

J. Fuller, Senior Resident Inspector

L. McKown, Resident Inspector

C. Highley, Resident Inspector

H. Anagnostopoulos, Senior Health Physicist

J. Brand, Reactor Inspector

Approved By: Daniel

L. Schroeder, Chief

Reactor Projects Branch 2 Division of Reactor Projects

SUMMARY The U.S. Nuclear Regulatory Commission (NRC) continued monitoring Dominion's

performance at Millstone Units 2 and 3 by conducting the baseline inspections described in this report in accordance with the Reactor Oversight Process. The Reactor Oversight Process is the NRC's

program for overseeing the safe operation of commercial nuclear power reactors. Refer to

https://www.nrc.gov/reactors/operating/oversight.html for more information. Licensee-identified non-cited violations are documented in report section 71153.

No findings or more-than-minor violations were identified.

Additional Tracking Items

Type Issue number Title Report

Section Status LER 05000336/2016-001-00 Turbine Driven Auxiliary Feedwater Pump Room HELB Door Left Open

71153 Closed

PLANT STATUS Unit 2 and 3 operated at or near rated thermal power for the entire inspection period.

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 performed plant status activities described in IMC 2515, Appendix D, "Plant Status," and conducted routine reviews using IP 71152, "Problem

Identification and Resolution." The inspectors reviewed selected procedures and records,

observed activities, and interviewed personnel to assess Dominion Energy's performance and compliance with Commission rules and regulations, license conditions, site procedures, and

standards.

REACTOR SAFETY

71111.01 - Adverse Weather Protection

Impending Severe Weather (2 Samples)

The inspectors evaluated readiness for impending adverse weather conditions for the onset of a severe storm with heavy snow and high winds on January 3, 2018.

The inspectors evaluated readiness for impending adverse weather conditions for a winter

storm watch on March 6, 2018.

71111.04 - Equipment Alignment

Partial Walkdown (5 Samples)

The inspectors evaluated system configurations during partial walkdowns of the following systems/trains at Unit 3:

(1) 'B' emergency diesel generator (EDG) air start system on January 22, 2018 (2) Charging system with both 'A' and

'B' pumps in service on January 31, 2018 (3) Control building chiller service water booster pump trains on February 6, 2018 (4) Auxiliary feedwater injection lines on February 12, 2018

(5) 'A' steam generator feedwater regulating bypass valve operator and control circuit on

March 27, 2018

71111.05A/Q - Fire Protection Annual/Quarterly

Quarterly Inspection (7 Samples)

The inspectors evaluated fire protection program implementation in the following selected

areas:

Unit 2 (1) Fire areas T-3 (motor driven auxiliary feedwater pump room) and T-4 (steam driven

auxiliary feedwater pump room) on January 24, 2018 (2) Fire area A-21, west direct current switchgear room on January 26, 2018

(3) Fire area A-15 and A-16, 'A' and 'B' EDG rooms on February 2, 2018

(4) Fire area T-10, upper vital switchgear room on February 8, 2018

Unit 3 (5) Fire area ESF-5, SE floor area auxiliary feed pump cubicle [21'6"] on January 10, 2018

(6) Fire area CB-8, cable spreading area on January 23, 2018 (7) Fire area FB-1, fuel building elevation 11' pipe chase / pipe tunnel pit on January 29, 2018

71111.06 - Flood Protection Measures

Cables (1 Sample)

The inspectors evaluated cable submergence protection in:

(1) Unit 3 north and south cable tunnels on January 23, 2018

71111.11 - Licensed Operator Requalification Program and Licensed Operator Performance

Operator Requalification (2 Samples)

The inspectors observed and evaluated Unit 2 operator requalification training on reactor

coolant system (RCS) leak (AOP-2568), reactor coolant pump malfunctions (AOP-2586), rapid downpower (AOP-2575), immediate operator actions (AOP-2585), reactor trip (EOP-2525), reactor trip recovery (EOP-2526), RCS leak rate calculation, condensate pump trips,

heater drain pump trips, and feed water heater tube leak on February 6, 2018.

The inspectors observed and evaluated Unit 3 control room simulator licensed operator requalification training including a small break loss of coolant accident, rapid downpower, and nuclear instrument failure, and verified completion of risk significant operator actions,

including the use of alarm response, abnormal, and emergency operating procedures on

February 13, 2018

Operator Performance (2 Samples)

The inspectors observed Unit 2 operator performance on plant downpower, turbine valve testing, annunciator response procedure usage for various turbine control alarms, and control room rounds on January 19, 2018.

The inspectors observed Unit 3 operator performance during 'B' EDG endurance

surveillance testing, emergency generator logic sequencer auto test failure and manual re-

test, failure and restoration of power range channel 41, and a medical emergency on

February 20, 2018.

71111.12 - Maintenance Effectiveness

Routine Maintenance Effectiveness

(6 Samples)

The inspectors evaluated the effectiveness of routine maintenance activities associated with the following equipment and/or safety significant functions:

Unit 2

(1) 'B' direct current switchgear room chiller (Vital Chiller) maintenance on January 23, 2018

(2) Radiation monitor failures on February 1, 2018

Unit 3 (3) 'B' EDG air start system on January 22, 2018

(4) Charging pump seal leakage on January 31, 2018 (5) Control building chiller service water booster pump trains on February 6, 2018 (6) Auxiliary feed water injection lines on February 12, 2018

71111.13 - Maintenance Risk Assessments and Emergent Work Control (8 Samples)

The inspectors evaluated the risk assessments for the following planned and emergent

work activities:

Unit 2 (1) 'B' EDG inoperable due to low oil temperature increased risk associated with other scheduled work on January 12, 2018 (2) Elevated risk due to charging and letdown outage required to perform replacement and calibration of M2LY-110Q, I to P converter, on January 18, 2018 (3) Functional testing of the steam generator level and auto auxiliary feedwater initiation logic potential Yellow risk window on February 12, 2018 (4) Auxiliary feedwater testing with potential for causing a Yellow risk window on

February 13, 2018

Unit 3 (5) 'A' turbine driven feed pump overspeed trip push button restoration on January 31, 2018 (6) Offsite line 310 outage concurrent with deep downpower first contingency to support offsite grid maintenance on February 9, 2018 (7) Procedurally controlled high risk plan for the manual performance of 'B' train emergency generator logic sequencer testing on February 20, 2018 (8) Line 348 outage and single output breaker operation on March 29, 2018

71111.15 - Operability Determinations and Functionality Assessments (8 Samples)

The inspectors evaluated the following operability determinations and functionality assessments:

Unit 2 (1) CR1078830 - through wall leakage in emergency core cooling system recirculation piping to refueling water storage tank on January 12, 2018 (2) 'B' EDG keep warm pump relay failure for oil temperatures on January 16, 2018 (3) Channel 'C' reactor protection system pre-trip light on January 24, 2018 (4) Indication of possible over power condition due to leading edge flow meter and total

venturi flow mismatch on January 30, 2018

Unit 3 (5) Reactor plant chilled water system containment isolation valves possible inadequate closing force operability determination and six month periodic review on January 11,

2018 (6) CR1087819 - steam generator back leakage into auxiliary feedwater on January 11, 2018 (7) CR1088497 - 'B' EDG air start system on January 22, 2018 (8) CR1090807 - additional purging performed during monthly 'A' EDG fuel oil storage tank

dewatering on February 27, 2018

71111.18 - Plant Modifications (1 Sample)

The inspectors evaluated the following temporary modification:

(1) Unit 3 alternate plant configuration (temporary modification) of charging 'A' and 'C' pumps to support 'A' seal troubleshooting on February 26, 2018

71111.19 - Post Maintenance Testing (11 Samples)

The inspectors evaluated post maintenance testing for the following maintenance/repair

activities:

Unit 2 (1) Shim switch failure on January 11, 2018 (2) 'B' EDG keep warm pump relay failure on January 16, 2018

(3) M2LY-110Q, I to P converter associated with chemical and volume control system, on

January 18, 2018 (4) 'B' train control room air conditioning unit 2A instrumentation calibration (removal and installation) and compressor inspection on January 22, 2018 (5) 'B' direct current switchgear room chiller (Vital chiller) after failure to start on January 24, 2018 (6) Replacement of SI-647 relay (high pressure safety injection isolation valve) on

February 12, 2018

Unit 3 (7) Normal station service transformer to bus 34B seismic door replacement on January 23, 2018 (8) 'B' EDG air compressors following troubleshooting and maintenance associated with inability to restore starting air flasks to normal standby pressure on January 23, 2018 (9) 'D' steam generator level instrument bistable card on February 9, 2018 (10) Power range nuclear instrument channel 41 power supply failure and restoration on

February 20, 2018 (11) 'A' wide range containment sump level indication troubleshooting and calibration on

February 21, 2018

71111.22 - Surveillance Testing

The inspectors evaluated the following surveillance tests:

Routine (8 Samples)

(1) Unit 2 'A' EDG monthly surveillances with a slow start on January 3, 2018

(2) Unit 2 main control valve, main stop valve, and combined intermediate valve operability test on January 19, 2018 (3) Unit 2 functional test of S/G level and auto auxiliary feedwater initiation logic on

February 12, 2018 (4) Unit 2 auxiliary feedwater valve testing on February 13, 2018

(5) Unit 3 auxiliary feedwater pump 3FWA*P2 operational readiness test on January 10, 2018 (6) Unit 3 SP 3612B.5, Primary Coolant Leakage Outside Containment - Summary Sheet

on January 31, 2018 (7) Unit 3 SP 3646A.2-006, Emergency Diesel Generator B 24 Hour Run and Restart, Revision 002, performed February 20-21, 2018 (8) Unit 3 'C' SP 600.5, QA Diesel Fuel Oil Delivery Post - Offload Results on February 28, 2018 Inservice (2 Samples)

(1) Unit 2 turbine driven auxiliary feedwater pump quarterly operational testing, MS-V201, V202, and V464 valve stroke and timing tests on January 24, 2018 (2) Unit 3 SP 3626.10-001, motor control center and rod control booster pump 3SWP*P3A

group B test on February 7, 2018

71114.06 - Drill Evaluation

Emergency Planning Drill

(1 Sample)

The inspectors evaluated the conduct of a routine Unit 3 emergency planning drill on February 28, 2018.

Drill/Training Evolution

(1 Sample)

The inspectors evaluated licensed operator requalification training, including a drill and exercise performance classification opportunity, at Unit 3 on January 9, 2018.

RADIATION SAFETY

71124.02 - Occupational As Low As Reasonably Achievable (ALARA) Planning and Controls

Radiological Work Planning (1 Sample)

The inspectors evaluated Dominions radiological work planning by reviewing the following

activities:

(1) ALARA Plan AP-2-17-01

(2) ALARA Plan AP-2-17-02

(3) ALARA Plan AP-2-17-13 (4) ALARA Plan AP-3-17-03 (5) ALARA Plan AP-3-17-11

(6) ALARA Plan AP-3-18-01

Verification of Dose Estimates and Exposure Tracking Systems (1 Sample)

The inspectors reviewed the current annual collective dose estimate; basis methodology; and measures to track, trend, and reduce occupational doses for ongoing work activities.

The inspectors evaluated the adjustment of exposure estimates or replanning of work. The

inspectors reviewed post-job ALARA evaluations.

OTHER ACTIVITIES - BASELINE

71151 - Performance Indicator Verification

The inspectors verified licensee performance indicators submittals listed below for the

period from January 2017

through December 2017. (4 Samples)

Unit 2 (1) RCS specific activity

(2) RCS identified leak rate

Unit 3 (3) RCS specific activity (4) RCS identified leak rate

71152 - Problem Identification and Resolution

Annual Follow-up of Selected Issue (1 Sample)

The inspectors reviewed the licensee's implementation of its corrective action program related to the following issue:

(1) Continued failures (trips) of the Unit 3 control building chillers (nine failures of the 'A' chiller and three failures of the 'B' chiller) since implementation of corrective actions for multiple failures of the Unit 3 'A' chiller in 2014.

71153 - Follow-up of Events and Notices of Enforcement Discretion

Licensee Event Reports (1 Sample)

The inspectors evaluated the following licensee event reports which can be accessed at

https://lersearch.inl.gov/LERSearchCriteria.aspx

(1) Licensee Event Report (LER) 2016-001-00, Turbine Driven Auxiliary Feedwater Pump Room HELB [High Energy Line Break] Door Left Open on April 27, 2016.

INSPECTION RESULTS

Observations Annual Follow-up of Selected Issues

71152 The inspectors assessed Dominion's problem identification threshold, assessment and operability determinations for each of the identified issues, maintenance rule applicability,

extent of condition reviews, and the prioritization and timeliness of corrective actions to determine whether Dominion staff was appropriately identifying, characterizing, and correcting problems associated with the chillers and whether the corrective actions were appropriate.

The prior failures in 2014 involved a failed card, several loose and/or broken connections and

an unexpected loose soldered connection (vice crimped), and spurious electrical signal spikes on the bearing temperature module. The inspectors determined these conditions have not recurred; and the subsequent failures have been properly evaluated and adequate corrective

actions have been completed and/or planned. Specifically, for each of the chiller failures

since 2014, Dominion conducted the appropriate level of cause evaluation and properly

identified and implemented appropriate applicable corrective actions. Included in these

corrective actions were developing modifications for both chillers to prevent spurious electrical signal spike trips and for replacing the existing electromechanical timers with solid state timers. Dominion also reviewed preventive maintenance activities and adjusted specific activity frequencies to enhance the service life of the components.

Licensee Event

Report (Closed)

Turbine Driven Auxiliary Feedwater Pump Room HELB [High Energy Line Break] Door Left Open on April 27, 2016

LER 2016-001-00

71153 Description: On April 27, 2016, with Millstone Power Station Unit 2 in MODE 1 at 100% power, plant personnel inadvertently left the door to the turbine driven auxiliary feed purnp room open. This condition existed for less than one hour. The door is a high energy line

break (HELB) barrier. With the door open there was no HELB protection for the motor driven auxiliary feedwater pumps thus potentially rendering both trains of auxiliary feedwater inoperable. The licensee determined that the cause was human performance error. The door

is conspicuously labeled on each side that it is a HELB boundary door and must be closed

except for entry and exit from the room. Corrective actions were taken in accordance with the station's corrective action program, and condition report 1035792 was initiated to address this

issue.

Closure Basis: The inspectors determined that Dominion's immediate actions to close the HELB door and subsequent corrective actions that created a computer based training,

assigned to current and future contractor personnel, to reinforce the requirements associated

with HELB doors were adequate. The inspectors determined that the failure to close and latch the HELB door represented a Green licensee identified violation of 10 CFR Part 50, Appendix B, Criterion V. This Green licensee identified violation is documented under

Inspection Results in Millstone's IR2018001. The inspectors did not identify any new issues

during the review of the LER. This LER is closed.

Licensee Identified Non-Cited Violation

71153 This violation of very low safety significant was identified by the licensee and has been entered into the licensee's corrective action program and is being treated as a non-cited violation, consistent with Section 2.3.2 of the Enforcement Policy. Violation: 10 CFR Part 50, Appendix B, Criterion V, "Instructions, Procedures, and Drawings," requires that "activities affecting quality shall be prescribed by documented instructions, procedures, or drawings, of a type appropriate to the circumstances and shall be accomplished in accordance with these instructions, procedures, or drawings."

Section 4.4 of Operating Procedure 2356, "Doors," Revision 004, states in part, "site personnel are responsible for ensuring doors [high energy line break boundary doors] are closed and latched after passage."

Contrary to the above, between 7:10 pm and 8:07 pm on April 27, 2016, with Millstone Unit 2 in Mode 1 at 100 percent power, Dominion personnel failed close and latch the HELB barrier

door between the steam driven and motor driven

auxiliary feedwater pumps, which rendered both trains of auxiliary feedwater inoperable for approximately 57 minutes.

Significance/Severity Level: The inspectors evaluated this finding using IMC 0609.04, "Initial Characterization of Findings," and IMC 0609, Appendix A, Exhibit 2, "Mitigating Systems

Screening Questions." The inspectors determined that the finding was of very low safety

significance (Green).

Corrective Action Reference: CR 1035792

EXIT MEETINGS AND DEBRIEFS

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

On April 4, 2018, the inspectors presented the quarterly resident inspector inspection results to Mr. John Daugherty, Site Vice President, and other members of the Millstone staff.

DOCUMENTS REVIEWED

71111.01 - Adverse Weather Protection

Miscellaneous Surveillance Form SP 3665.2-001, Intake Structure Condition Determination with Vacuum in

Condenser, dated March 6, 2018 Surveillance Form SP 2654R-001, Intake Structure Condition Determination (With Vacuum in

Condenser), dated March 6, 2018

71111.04 - Equipment Alignment

Procedures OP 3304A, Charging and Letdown SP 3604A.1, Charging Pump 'A' Operational Readiness Test, Revision 017 SP 3612B.5, Primary Coolant Leakage Outside Containment - Summary Sheet, Revision 001-

01, performed January 31, 2018 SP 3604A.1, Charging Pump 'A' Leaktightness Verification Check, Revision 005-04, performed

January 31, 2018 SP 3626.10-001, Motor Control Center and Rod Control Booster Pump 3SWP*P3A Group B

Test, Revision 012-01

Condition Reports CA3100943 CA3114923 1068440 1087819

1088497 1088897 1090041 1090044

1090717

Maintenance Orders/Work Orders 53103053362 53103079863 53103084426 53103104435

53103108717 53203153366

Miscellaneous 25212-26916, Sheet 4, PID 'B' Emergency Diesel Generator Air Start System, Revision 20

3C19-CHS01-0002, Alternate Plant Configuration for Isolation of 'A' Charging Pump due to Seal

Leakage 25212-26904, Sheet 1, PID Charging and Letdown System, Revision 54 25212-26933, Sheet 2, PID Service Water System, Revision 90 25212-26933, Sheet 4, PID Service Water System, Revision 54

212-26930, Sheet 2, PID 'B' Auxiliary Feedwater System, Revision 49

212-26930, Sheet 3, PID Feed Water System, Revision 30

71111.05 - Fire Protection

Procedures MP-PROC-ENG-U3-24-FFS-BAP01-ESF-MAP, Revision 0

Millstone Unit 2 Fire Fighting Strategy for Fire Areas: T-10, 13, and 14

Miscellaneous U3-24-FFS, Millstone Unit 3 Fire Fighting Strategies, Revision 0 Millstone Unit 3 Fire Protection Evaluation Report, Revision 21.3

71111.06 - Flood Protection Measures

Condition Reports CA277474 1087853

Miscellaneous ETE-MP-2015-1057, Condition Monitoring of Structures, Revision 0

71111.11 - Licensed Operator Requalification Program

Procedures SP 2651M, Combined Intermediate Valves Operability Test, Revision 005

SP 2651L, Main Stop Valve Operability Test, Revision 004-01

SP 2651N, Main Control Valve Operability Test, Revision 007

OP 2204, Load Changes, Revision 038 SP 2651L-002, Quarterly Main Stop Valve Operability Test, Revision 002

SP 2651M-002, Combined Intermediate Valves Operability Test, Revision 002

SP 2651N-001, Main Control Operability Test, Revision 003-01

AOP 2585, Immediate Operator Actions, Revision 003-00 AOP 2568, Reactor Coolant System Leak, Revision 016 AOP 2575, Rapid Down Power, Revision 010-00

EOP 2526, Reactor Trip Recovery, Revision 019-00

EOP 2525, Standard Post Trip Action, Revision 028-00

AOP 2586, RCP Malfunctions, Revision 004

SP 3448E41, Train B - Diesel Sequencer Actuation Logic Test, Revision 006-01 SP 3646A.2, Emergency Diesel Generator B Operability Test, Revision 025

Work Orders 53102961788 53103112699 53203157223

Condition Reports 1088243 1088260 1088261 1090369 1090404 1090469

Miscellaneous ER-AA-RXE- Attachment 4, Reactivity Plan, Dated January 19, 2018 LORP program # S18103, Simulator Exercise Guide Minimum manning/Secondary Malfunctions course # 70260 LORP program # S18102, Simulator Exercise Guide RCS Leak AOP-2568 course # 70160

71111.12 - Maintenance Effectiveness

Procedures SP 3626.10-001, Motor Control Center and Rod Control Booster Pump 3SWP*P3A Group B

Test, Revision 012-01 SP 3604A.1, Charging Pump 'A' Operational Readiness Test, Revision 017

Work Orders 53102987484 53103053362 53103079863 53103084426 53103104183 53103104435 53103108717 53203153366

Condition Reports CA3064516 CA3040023 CA3114923 CA3100943 1068440 1087819 1088497 1088897 1090041 1090044 1090717

Miscellaneous Failure report number 361 for 'B' DC SWGR room chiller, dated March 21, 2002

Radiation monitors Maintenance Rule Evaluations (MRE) Unit 2, since January 1 2016

212-26933, Sheet 2, PID Service Water System, Revision 90 25212-26933, Sheet 4, PID Service Water System, Revision 54 3C19-CHS01-0002, Alternate Plant Configuration for Isolation of 'A' Charging Pump due to Seal

Leakage 25212-26904, Sheet 1, PID Charging and Letdown System, Revision 54

212-26916, Sheet 4, PID 'B' Emergency Diesel Generator Air Start System, Revision 20 25212-26930, Sheet 2, PID 'B' Auxiliary Feedwater System, Revision 49

71111.13 - Maintenance Risk Assessments and Emergent Work Control

Procedures IC2418D1, Setting Letdown Limiter LLM - 110 High and Low Limit Setpoints, Revision 001-03

C IC 400.05-002, Instrument/Loop Calibration Testing Guidelines, dated January 14, 2013

SP 2610CO, AFW system lineup, valve operability and operational readiness tests, operating, Revision 001 SP 2610CO-002, 2-FW-43A and 2-FW-43B Failure mode and stroke time IST, Revision 001

SP 2610CO-001, Auxiliary feedwater flow path lineup verification, Revision 001 SP 2402M, Functional test of steam generator level and auto-aux. feedwater initiation logic, Revision 011 SP 3621.4, Main Feedwater Turbine Emergency Governor and Trip Lockout Test, Revision 001

SP 3448E41, Train B - Diesel Sequencer Actuation Logic Test, Revision 006-01

Condition Reports 1086031 1090369 1090404 1090469

Work Orders 53102961788 53103112699 53203149868 53203157223

Miscellaneous Medium Risk Plan for CR1086138 dated January 17, 2018 Operator risk report unit 2 dated February 13, 2018

Operator risk report unit 2 dated February 12, 2018

WO# TMC80101 EOOS Version 4.1 for Millstone Unit 3 on February 9, 2018 EOOS Version 4.1 for Millstone Unit 3 on March 29, 2018

High Risk Plan, Eversource TOA 18-00852 and 18-00768

EOOS Version 4.1 for Millstone Unit 3 on January 31, 2018

EOOS Version 4.1 for Millstone Unit 3 on February 20, 2018

71111.15 - Operability Determinations and Functionality Assessments

Procedures

ER-M2-THM-201 attachment 1, Feed flow correction factor determination, Revision 0

ER-M2-THM-201, Determining feed flow correction factors for MP Unit 2, Revision 0

EN 21002, Core Heat Balance, Revision 017

SP 2601D-001, Power range channel and delta T power channel calibration, Revision 016-01

C SP 600.5, QA Diesel Fuel Oil Delivery Post - Offload Results, Revision 003, performed

February 28, 2018

Condition Reports CA3061625 CA3114923 CA3100943 1078830

1087718 1087785 1087819 1088497 1088558 1088839 1089030 1090041 1090044 1090807

Maintenance Orders/Work Orders 53203152143 53203153366

Miscellaneous Periodic review of OD CR1073242/CA3061625 dated January 11, 2018

Prompt operability determination documentation for CR1073242 dated July 14, 2017

P&ID 6822-34868A, Reactor Protective System Bistable Trip Unit Schematic, Revision dated December 1, 2004 Unit 2 Control room narrative logs, dated January 25, 2018 Unit 2 Control room narrative logs, dated March 2, 2018

Unit 2 Control room narrative logs, dated February 5-8, 2018

Unit 2 Control room narrative logs, dated January 30, 2018

212-26916, Sheet 4, PID 'B' Emergency Diesel Generator Air Start System, Revision 20 ETE-MP-2017-1144, Code Case N-513-3 Limit Load Planer Flaw Evaluation on Line 6"-HCD-3, Return to RWST, Revision 0 25203-26015, PID

L.P. Safety Injection System, Revision 50

71111.18 - Plant Modifications

Procedures SP 3612B.5, Primary Coolant Leakage Outside Containment - Summary Sheet, Revision 001-

01, performed January 31, 2018 SP 3604A.1, Charging Pump 'A' Leaktightness Verification Check, Revision 005-04, performed

January 31, 2018

Condition Reports 1088897 1090717

Miscellaneous 3C19-CHS01-0002, Alternate Plant Configuration for Isolation of 'A' Charging Pump due to Seal

Leakage 25212-26904, Sheet 1, PID Charging and Letdown System, Revision 54

71111.19 - Post-Maintenance Testing

Procedures SP 3447B01A-001R, Containment Sump Wide Range Level Rack Channel Calibration Train A, Revision 000, performed February 12, 2018 SP 3441A10, Power Range Neutron Flux Monitor 41 Channel Calibration, Revision 004

Condition Reports CA3114923 565360 1087675 1087718 1088410 1088418 1088497 1089726 1089754 1089767 1090369 1090404

Maintenance Orders/Work Orders 53102748541 53102756227 53102916491 53102987484 53103104183 53103123688 53203149868 53203152142 53203152143 53203153366 53203156607 53203156690

203156704 53203157223

Miscellaneous Trouble shooting plan for CR 1087675 M2 Control Element Drive System (CEDS), dated

January 11, 2018 Failure report number 361 for 'B' DC SWGR room chiller, dated March 21, 2002

P&ID 25203-39045 SH 78, Rear Panel Wiring Diagram Engineered Safeguards Section CO-1, Revision 17 25212-26916, Sheet 4, PID 'B' Emergency Diesel Generator Air Start System, Revision 20

71111.22 - Surveillance Testing

Procedures SP 2610BO-004, Auxiliary Feedwater Pump Turbine Trip Throttle Valve Exercise Test, Revision

2 SP 2610BO-002, Turbine Driven Auxiliary Feedwater Pump and Recirculation Check Valve In-Service Inspection Testing (IST), Revision 002 SP 2610BO-001, 2-MS-201, 2-MS-202, and 2-MS-464 (SV-4188) Stroke and Timing In-Service Inspection Testing (IST), Revision 002 SP 2651M, Combined Intermediate Valves Operability Test, Revision 005 SP 2651L, Main Stop Valve Operability Test, Revision 004-01 SP 2651N, Main Control Valve Operability Test, Revision 007

OP 2204, Load Changes, Revision 038

ER-AA-RXE- Attachment 4, Reactivity Plan, Dated January 19, 2018

SP 2651L-002, Quarterly Main Stop Valve Operability Test, Revision 002 SP 2651M-002, Combined Intermediate Valves Operability Test, Revision 002 SP 2651N-001, Main Control Operability Test, Revision 003-01

CM-M2-STI-101, Millstone Unit 2 Technical Specification Surveillance Test Interval (STI0 List, Revision 7 SP 3622.3, Auxiliary Feedwater Pump 3FWA*P2 Operational Readiness Test, Revision 027

SP 3622.3-001 Surveillance Form - TDAFW Pump Operational Readiness and Quarterly IST Group B Pump Tests, dated January 10, 2018 SP 2619G, AC Electrical Sources Inoperability, Revision 005

SP 2613K, Diesel Generator Slow Start Operability Test Facility 1, Revision 007

SP 2670, Saltwater Cooled HX D/P Determination, Revision 016

OP 2346A, 'A' Emergency Diesel Generator, Revision 034 OP 2346A-002, 'A' DG Pre-start Checklist, Revision 021

OP 2346A-004, 'A' DG Data Sheet, Revision 024-03 SP 2613K-001, Periodic DG Slow Start Operability Test, Facility 1 (Loaded Run), Revision 005 SP 2670-004, Diesel Generator 'A' HX D/P Determination, Revision 001-05

OP 2346A-009, 'A' DG Air Roll, Revision 000-04

SP 2619G-002, TS 3.8.1.1.b - One EDG Inoperable, Revision 002-01

SP 2610CO, AFW System Lineup, Valve Operability and Operational Readiness Tests, Operating, Revision 001 SP 2610CO-002, 2-FW-43A and 2-FW-43B Failure Mode and Stroke Time IST, Revision 001 SP 2610CO-001, Auxiliary Feedwater Flow Path Lineup Verification, Revision 001

SP 2402M, Functional Test of Steam Generator Level and Auto-Aux. Feedwater Initiation Logic, Revision 011 SP 3646A.2, Emergency Diesel Generator 'B' Operability Test, Revision 025 SP 3604A.1, Charging Pump 'A' Operational Readiness Test, Revision 017

Work Orders 53102961788 53103053362 53103079863 53103084426

53103096824 53103104435 53103104903 53103104933 53103104942 53103108717 53103112699 53203157223

Condition Reports 1068440 1088243 1088260 1088261

1088557 1088897 1090369 1090404

1090469 1090717 1090807

Miscellaneous ER-AA-RXE- Attachment 4, Reactivity Plan, Dated January 19, 2018

212-26933, Sheet 2, PID Service Water System, Revision 90

212-26933, Sheet 4, PID Service Water System, Revision 54

71114.06 - Drill Evaluation

Miscellaneous EP-AA-103 Attachment 3, Classification Opportunity, for LORTSE55 on January 9, 2018

SERO Log Sheet, dated February 28, 2018 Drill Incident Response Forms EOF Protective Action Recommendations for Drill dated February 28, 2018

Unit 3 Rehearsal Drill Objectives and Critique dated February 28, 2018

71151 - Performance Indicator Verification

Procedures SP 3601F.6, Reactor Coolant System Water Inventory Measurement, Revision 008-00

SP 3855, Reactor Coolant Analysis for Dose Equivalent, Rev. 8

SP3670.1, Mode 1-4 Daily and Shiftly Control Room Rounds

SP 2602A, Reactor Coolant Leakage, Revision 10 C OP 200.15, RCS Leakage Trending and Investigation, Revision 3

SP 2619A, Control Room Daily Surveillance, Mode 1 & 2, Revision 56

Surveillance Test Reports SP3855-001, Reactor Coolant Analysis for Dose Equivalent I-131, dated December 4, 2017 SP3855-001, Reactor Coolant Analysis for Dose Equivalent I-131, dated October 9, 2017 SP3855-001, Reactor Coolant Analysis for Dose Equivalent I-131, dated September 11, 2017

Miscellaneous 2017 Monthly Leakage Spreadsheet for Units 2 and 3

2017 RCS Activity Spreadsheet for Units 2 and 3

71152 - Problem Identification and Resolution

Condition Reports 570737 571897 578532 1001480 1005259 1044700 1054758 1057865 1057896 1073086 1076228 1083510

Miscellaneous ACE 019884, Green NCV Finding 3HVK*CHL1A Chiller Trips, September 26, 2014 -

December 13, 2014, Revision 0 CA3004488, Root Cause Evaluation, CR1005259, Significant Level 2 Multiple Unit 3 'A' Control Building Chiller Trips, dated September 11, 2015 ETE-MP-2017-1009, Classification of MPS Systems Using the Tiered Approach to System Selection, Revision 0

Modification MP3-15-01158, Chiller M33HVK*CHL 1B Bearing and Motor Module Time Delay, January 13, 2016

Work Orders 53102695494 53102906138

71153 - Follow-up of Events and Notices of Enforcement Discretion

Procedures

OP 2356, Doors, Revision 004

Condition Reports

CR1035792 Apparent Cause Evaluation #3030473 (2016)

Apparent Cause Evaluation #019415 (2013)