IR 05000336/2018002

Integrated Inspection Report 05000336/201802 and 05000423/2018002 and Independent Spent Fuel Storage Installation Inspection Report 07200047/2018001

ML18211A566
Person / Time
Site:	Millstone
Issue date:	07/27/2018
From:	Daniel Schroeder Reactor Projects Branch 2
To:	Stoddard D Dominion Energy
Schroeder D
References
EPID I-2018-002-0073 IR 2018001, IR 2018002
Download: ML18211A566 (17)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION uly 27, 2018

SUBJECT:

MILLSTONE POWER STATION - INTEGRATED INSPECTION REPORT 05000336/2018002 AND 05000423/2018002 AND INDEPENDENT SPENT FUEL STORAGE INSTALLATION INSPECTION REPORT 07200047/2018001

Dear Mr. Stoddard:

On June 30, 2018, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Millstone Power Station, Units 2 and 3. On July 10, 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.

The NRC inspectors did not identify any finding or violation of more than minor significance.

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 05000336/2018002 and 05000423/2018002 and 07200047/2018001

Inspection Report

Docket Numbers: 50-336 and 50-423 License Numbers: DPR-65 and NPF-49 Report Numbers: 05000336/2018002, 05000423/2018002, and 07200047/2018001 Enterprise Identifier: I-2018-002-0073 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: April 1 to June 30, 2018 Inspectors: J. Fuller, Senior Resident Inspector L. McKown, Resident Inspector C. Highley, Resident Inspector H. Anagnostopoulos, Senior Health Physicist J. Nicholson, Senior Health Physicist K. Warner, Health Physicist Approved By: Daniel L. Schroeder, Chief Reactor Projects Branch 2 Division of Reactor Projects Enclosure

SUMMARY

The U.S. Nuclear Regulatory Commission (NRC) continued monitoring Dominions performance at Millstone Power Station, 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 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. NRC-identified and self-revealed findings, violations, and additional items are summarized in the table below.

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

Additional Tracking Items Type Issue number Title Report Status Section LER 05000423/2016-001-00 Automatic Reactor Trip on 71153 Closed Reactor Coolant System Low Flow Due to Loss of 'B'

Reactor Coolant Pump LER 05000423/2016-004-00 Manual Reactor Trip Due to 71153 Closed Low Hydrogen Gas Pressure in Main Generator LER 05000423/2016-005-00 Technical Specification 71153 Closed Required Shutdown and Manual Reactor Trip Due to Steam Generator Level Oscillation

PLANT STATUS

Units 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 licensee performance and compliance with Commission rules and regulations, license conditions, site procedures, and standards.

71111.01 - Adverse Weather Protection Summer Readiness

The inspectors evaluated summer readiness of offsite and alternate AC power systems on June 11, 2018.

71111.04 - Equipment Alignment Partial Walkdown

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

Unit 3

(1) Motor driven auxiliary feedwater trains A and B on April 2, 2018

(2) Pressurizer pressure relief and head vent discharge paths during online containment walkdown on April 10, 2018

(3) Safety injection train B on April 25, 2018

(4) 4.16 kV alternating current electrical distribution on April 25, 2018

(5) 'D' service water pump train with 'B' pump out of service April 26, 2018

(6) Pressurizer spray control system within containment on June 20, 2018

Complete Walkdown (2 Samples)

The inspectors evaluated system configurations during a complete walkdown of the following systems:

Unit 2 & 3

(1) 15G 345kV ring bus on June 11, 2018 Unit 3

(2) Safety injection pump cooling on April 24, 2018

71111.05AQ - Fire Protection Annual/Quarterly Quarterly Inspection

The inspectors evaluated fire protection program implementation in the following selected areas:

Unit 2

(1) West 480V control building room (Fire Area T-6) on April 16, 2018

(2) Diesel fuel oil storage tank (Fire Area Y-12) on May 16, 2018

(3) West cable vault (Fire Area T - 08) on May 31, 2018 Unit 3

(4) Motor driven auxiliary feedwater pump 'A' (Zone ESF-8) and pump B (Zone ESF-9) on April 2, 2018

(5) Engineered safety features building east floor area (Zone ESF-4) on April 2, 2018

(6) 'A' and 'B' diesel generator enclosures (Fire Areas EG-3 Zone A and EG-4 Zone A) on

May 1, 2018 Annual Inspection (1 Sample)

The inspectors evaluated fire brigade performance during an announced drill in the Unit 3 cable spreading area on June 21, 2018.

71111.06 - Flood Protection Measures Internal Flooding

The inspectors evaluated internal flooding mitigation protections in the Unit 3 flood zone T-10, Upper 4160V switchgear room at elevation 56'6" on April 26, 2018, and in the Unit 3 emergency diesel generator cubicles on May 3, 2018.

71111.07 - Heat Sink Performance Heat Sink

The inspectors evaluated Dominions monitoring and maintenance of the Unit 2 A reactor building closed cooling water heat exchanger inspection on June 4, 2018, and the Unit 3 'A' charging pump closed cooling water heat exchanger inspection on May 7, 2018.

71111.11 - Licensed Operator Requalification Program and Licensed Operator Performance Operator Requalification

The inspectors observed and evaluated a crew of licensed operators in the Unit 2 simulator during licensed operator requalification training on June 6, 2018.

The inspectors observed and evaluated a crew of licensed operators in the Unit 3 simulator during licensed operator requalification training on April 24, 2018.

Operator Performance (2 Samples)

The inspectors observed and evaluated Unit 3 operator performance during a plant downpower on April 18, 2018.

The inspectors observed Unit 2 operator performance during abnormal operating procedure tabletop demonstration of rapid downpower as well as auxiliary feedwater regulating valve inservice testing on May 13 & 14, 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:

(1) Unit 2, high pressure safety injection header stop valve, 2-SI-647, closed and de-energized to maintain containment isolation safety function during 33X relay replacement on April 5, 2018

Quality Control (1 Sample)

The inspectors evaluated maintenance and quality control activities associated with the following equipment performance issues:

(1) Commercial grade dedication of limit switches for refueling water recirculating pump suction isolation valves 3QSS*AOV27 and 3QSS*AOV28 on June 13, 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) Risk assessment associated with the A motor driven auxiliary feedwater pump suction valve inservice test on April 3, 2018

(2) Elevated unit turbine trip risk during emergent replacement of main turbine control system IONet switch (R channel) on May 30, 2018 Unit 3

(3) Elevated risk during reactor protection set cabinet testing on April 13, 2018

(4) Elevated risk associated with reserve station service transformer feed of safety-related 4.16 kV Bus 34D Online on April 25, 2018

(5) Risk assessment of scheduled 'A' train work with 'A' train protected due to delays in 'B' service water pump-motor overhaul restoration on April 30, 2018

(6) Emergency diesel generator jacket water repair and post maintenance testing concurrent with manual emergency generator logic sequencer testing on May 8, 2018

(7) Sequential execution of elevated risk activities given the following work activities: 34C bus undervoltage testing, auxiliary feedwater control cabinet power supply replacements, 'A' emergency diesel generator monthly surveillance testing, all in parallel with moisture separator reheater drain tank emergency dump valve through wall leak restoration on June 7, 2018

71111.15 - Operability Determinations and Functionality Assessments

The inspectors evaluated the following operability determinations and functionality assessments:

Unit 2

(1) Prompt operability determination for control room envelope due to incorrect partitioning coefficient used in steam generator tube rupture radiological design basis analysis on April 26, 2018

(2) CR1099969 & CR1100016, #1 main steam isolation valve steam leak at the valve stem packing on June 21, 2018 Unit 3

(3) CMS 22 circuit issue on February 7, 2018

(4) Design document deficiency for cold leg injection permissive (P19) on March 5, 2018

(5) CR1094025 elevated pressurizer code safety and power operated relief valve tail pipe temperatures on April 4, 2018

(6) CR1089846 & CR1094346, refueling water storage tank recirculation isolation valves installed without adequate components for freezing conditions on April 12, 2018

(7) CR1096387, 'A' charging system min-flow recirculation mispositioned during 'C' charging system surveillance testing and operation on May 3, 2018

(8) Operability determination for nonconforming fillet welds associated with reactor plant component cooling water header at the inlet and outlet flanges to the B reactor plant component cooling water heat exchanger on June 13, 2018

71111.18 - Plant Modifications

The inspectors evaluated the following temporary or permanent modifications:

Unit 2

(1) Permanent A high pressure safety injection pump design change, DC-MP2-10-01103, install new UltraFLEXX motor to pump coupling on May 5, 2018

(2) Temporary cooling to direct current switchgear on June 7, 2018

(3) Temporary modification of control room boundary enclosure ventilation ductwork on June 20, 2018

71111.19 - Post Maintenance Testing

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

Unit 2

(1) A high pressure safety injection pump coupling design change and oil indicator replacement on May 5, 2018

(2) A emergency diesel generator maintenance outage for indicator valve #9 replacement and bearing thermocouple replacement on May 31, 2018 Unit 3

(3) 'B' service water pump motor overhaul on May 1, 2018

(4) 'A' charging system closed cooling water train piping replacement on May 7, 2018

(5) 'A' emergency diesel generator jacket water repair on May 8, 2018

(6) B emergency diesel generator maintenance outage to repair fuel oil leaks and scavenging air tubing replacement on May 23, 2018

71111.22 - Surveillance Testing The inspectors evaluated the following surveillance tests: Routine

Unit 2

(1) A service water pump and discharge check valve inservice test on April 9, 2018

(2) Leak rate testing of the A hydrogen analyzer on April 11, 2018

(3) SP 2610CO-004, Remote Position Indication IST: 2-FW-43A and 2-FW-43B, Revision 001 on May 14, 2018 Unit 3

(4) A motor driven auxiliary feedwater pump inservice test on April 2, 2018

(5) SP 3630E.2, Safety Injection Pump 'B' Cooling Pump Operational Readiness Test,

Revision 008 on April 25, 2018 Inservice (2 Samples)

(1) Unit 3, SP3608.2 Safety Injection Pump 'B' Operational Readiness Test, Revision 010-04, on April 25, 2018

(2) Unit 3, SP 3646A.9-020, Auxiliary Feedwater Pump Start S940 - Relay K640, Slave Relay Actuation Test - Train B, Revision 002 preceding SP 3622.2, Auxiliary Feedwater Pump 3FWA*P1B Operational Readiness Test, Revision 018 on May 16, 2018

Reactor Coolant System Leak Detection (1 Sample)

(1) Unit 3, reactor coolant system leakage detection surveillance on June 22,

71124.03 - In-Plant Airborne Radioactivity Control and Mitigation Engineering Controls

The inspectors evaluated airborne controls and monitoring.

Self-Contained Breathing Apparatus for Emergency Use

The inspectors evaluated Dominions self-contained breathing apparatus program.

OTHER ACTIVITIES - BASELINE

71151 - Performance Indicator Verification The inspectors verified licensee performance indicators submittals listed below for the period from April 1, 2017 through March 31, 2018.

Unit 2

(1) Unplanned scrams

(2) Unplanned power changes

(3) Unplanned scrams with complications Unit 3

(4) Unplanned scrams

(5) Unplanned power changes

(6) Unplanned scrams with complications

71152 - Problem Identification and Resolution Semiannual Trend Review

The inspectors reviewed the licensees implementation of its corrective action program related to Unit 2 and Unit 3 procedure feedback incorporation process to determine whether an adverse trend existed.

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) Unit 3, Licensee Event Report (LER) 2016-001-00, Automatic Reactor Trip on Reactor Coolant System Low Flow Due to Loss of 'B' Reactor Coolant Pump on January 25, 2016 The inspectors determined that it was not reasonable to foresee and prevent the cause discussed in the LER. Therefore, no performance deficiency was identified. The inspectors also concluded that no violation of NRC requirements occurred.

(2) Unit 3, LER 2016-004-00, Manual Reactor Trip Due to Low Hydrogen Gas Pressure in Main Generator on May 15, 2016 The inspectors determined that it was not reasonable to foresee and prevent the cause discussed in the LER. Therefore, no performance deficiency was identified. The inspectors also concluded that no violation of NRC requirements occurred.

(3) Unit 3, LER 2016-005-00, Technical Specification Required Shutdown and Manual Reactor Trip Due to Steam Generator Level Oscillation on June 12, 2016 The inspectors determined that it was not reasonable to foresee and prevent the cause discussed in the LER. Therefore, no performance deficiency was identified. The inspectors also concluded that no violation of NRC requirements occurred.

OTHER ACTIVITIES

- TEMPORARY INSTRUCTIONS, INFREQUENT, AND ABNORMAL

60855.1 - Operation of an Independent Spent Fuel Storage Installation

The inspectors evaluated Dominions independent spent fuel storage installation cask loadings on May 7-10, 2018. Specifically, the inspectors observed the following activities:

- Fuel selection and fuel loading

- Heavy load movement of the transfer cask with both an empty and loaded dry storage canister

- Drying and backfill evolutions

- Closure welding and non-destructive weld evaluations

- Transfer and transport evolutions

- Radiological field surveys

EXIT MEETINGS AND DEBRIEFS

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

On May 10, 2018, the inspectors presented preliminary independent spent fuel storage installation inspection results to Mr. John Daugherty, Site Vice President, and other members of the Millstone staff at the conclusion of onsite inspection activities and on May 24, 2018, during a final telephone exit interview.

On July 10, 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

SAP Work Order #68236057

204-91001, Millstone 15G Nomenclature Drawing, Revision 48

Millstone Switchyard Technical Inspection 06/7/2017

71111.04 - Equipment Alignment

Drawings

212-26930 Sheet 2, Piping and Instrumentation Diagram Feedwater System, Revision 49

212-30001, Main One Line Phasing Diagram Power Distribution System, Revision 26

212-26933, Sheet 1, Service Water System, Revision 44

212-26902, Sheet 3, Reactor Coolant System, Revision 26

212-26913, Sheet 1, PID High Pressure Safety Injection System, Revision 33

212-26913, Sheet 2, PID High Pressure Safety Injection System, Revision 42

212-26914, Safety Injection Pump Cooling System, Revision 18

Condition Reports

1092332 1094025

Maintenance Orders/Work Orders

53102325860 53102334432 53102649799 53102650193

53103134140

Miscellaneous

Millstone Power Station Unit 3 Final Safety Analysis Report, Figure 8.1-3 345kV Switchyard,

Revision 28

Millstone Unit 3 High Pressure Safety Injection System Health Report 4Q2017

71111.05 - Fire Protection

Procedures

U3-24-FFS-BAP01-ESF-MAP

Millstone Unit 3 Fire Fighting Strategies for Engineered Safety Features Building

U2-24-FFS-BAP01-CB-MAP

Millstone Unit 2 Fire Fighting Strategies for 480 Volt Load Center Rooms

U2-24-FFS, Millstone Unit 2 Fire Fighting Strategies, Revision 0

MP-PROC-ENG-U2-24-FFS-BAP01-TB-Map, Revision 1

Miscellaneous

Millstone Unit 3 Fire Protection Evaluation Report, Revision 21.3

71111.06 - Flood Protection Measures

Miscellaneous

NOTEBK-PRA-MPS2-IF.2, Flood Scenario Development, Revision 5 (pages 37-38)

P(R)-1073, Maximum Flood Level Effect on Safety Related Equipment in Diesel Generator

Building, Updated January 10, 2013

212-SP-ME-810, Specification for Detailed Hazard Review, Updated August 17, 1995

MS12179-300A, Hazards Review Program Summary, dated January 21, 1986

71111.07 - Heat Sink Performance

Procedures

ER-AA-HTX-1002 attachment 2, Heat Exchanger Visual Inspection Form Tubeside, dated

April 4, 2016, Dated December 4, 2017, and Dated June 4, 2018

Work Orders

53102495486 53102808247

Miscellaneous

Eddy Current Field Report RBCCW X18A, Dated December 7, 2017

71111.11 - Licensed Operator Requalification Program

Procedures

OP 3320, Feedwater Heater Drains and Vents, Revision 20

SP 2610CO-004, Remote Position Indication IST: 2-FW-43A and 2-FW-43B, Revision 000-00

AOP 2557, Emergency Generation Reduction, Revision 11

Condition Reports

1094795

Miscellaneous

Reactivity Plan for downpower to 93% for feedwater heater 1A normal level control valve repair,

dated April 18, 2018

Troubleshooting Plan for CR 1094795 and Work Order 53203162803

Work Order 53203162803

Medium Risk Plan for Unit 3 downpower to 93% power on April 18, 2018

Millstone Unit 3 Simulator Guide for licensed operator requalification training on April 24, 2018

[Exam 18-03]

Simulator Exercise Guide Seg# S18401, MP2 LORP, Revision 0

71111.12 - Maintenance Effectiveness

Procedures

MS-AA-PTE-401 attachment 5, Commercial Grade Item Evaluation for Procurement Technical

Evaluation 10000054868

Condition Reports

1089754 1089794

Miscellaneous

Procurement technical evaluation number 10000053903 and associated commercial grade item

evaluation

Substantial safety hazard evaluation for CR 1095709, dated May 30, 2018

71111.13 - Maintenance Risk Assessments and Emergent Work Control

Procedures

SP 2610CS, AFW Valve Operability and Operational Readiness Tests, Shutdown

WM-AA-20, Risk Assessment of Maintenance Activities, Revision 2

OP-AA-1500, Operational Configuration Control, Revision 15

ER-AA-MRL-100, Implementing Maintenance Rule, Revision 11

NF-AA-PRA-370, Probabilistic Risk Assessment Procedures and Methods: MRule (a)(4) Risk

Monitor Guidance, Revision 19

Condition Reports

1093896 1094360 1098339

Work Order

WO 53203195005 and associated high risk plan, dated May 29, 2018

Miscellaneous

EOOS Version 4.1 for Millstone Unit 3 on 4/13/2018

EOOS Version 4.1 for Millstone Unit 3 on 4/25/2018

EOOS Version 4.1 for Millstone Unit 3 on 4/30/2018

EOOS Version 4.1 for Millstone Unit 3 on 6/7/2018

71111.15 - Operability Determinations and Functionality Assessments

Procedures

OP-AA-102, Operability Determination, Revision 15

ETE-MP-2018-1024, Engineering Technical Evaluation for Filter Stepping the U3 Containment

Atmosphere Radiation Monitor, Revision 0

Condition Reports

1071075 1091289 1091599 1093387

1093397 1094790

Work Orders

53102849169 53103092283

Miscellaneous

Prompt operability determination (OD number CA3059654) for CR 1071075

Prompt operability determination (OD number CA3187584) for CR 1094790

Apparent Cause Evaluation 17526, Trending in 3CMS*RE22 Failures, dated April 13, 2009

71111.18 - Plant Modifications

Procedures

ER-MP-CRH-102, Millstone Unit 2 Control Room Habitability Program, Revision 3

OP-M2-MOP-VEN-006, West 125 Volt DC Vital Switchgear Room Cooling (FEG 2315D00),

Revision 2

Condition Reports

1075792

Maintenance Orders/Work Orders

53103110707

Miscellaneous

MP2-18-00170, exterior patch installed on bottom of X42A cooler drip pan, Revision 0

71111.19 - Post-Maintenance Testing

Procedures

DC-MP2-10-01103, Install new UltraFLEXX motor to pump coupling, Dated May 5, 2018

SP3646A.22-002, Train B EDG Air System Check Valve Test, Revision 001-02

SP3646A.22-001, Emergency Diesel Generator B Operability Tests, Revision 026

SP3646B.6-002, Diesel Fuel Oil Storage Tank 1B to EDG A Day Tank Test, Revision 006

OP 2345A, A Emergency Diesel Generator sections 4.4 through 4.6, revision 034

Maintenance Orders/Work Orders

53102325860 53102334432 53102575974 53103095865

53103096343 53103111665 53103114809 53103141162

203152262 53203162334 53203194945

71111.22 - Surveillance Testing

Procedures

SP 2612A, A Service Water Pump Tests, Revision 018

SP 2612A-003, A SW pump and Facility 1 discharge check valve IST, Revision 010 dated April

07, 2018, January 14, 2018, and October 13, 2017

SP3622.1, Auxiliary Feedwater Pump 3FWA*P1A IST Group B Pump Test, dated April 2, 2018

SP2608H, Leak Test of the Hydrogen Sampling System, Revision 009

SP 2608H-006, Leak Testing of the A Hydrogen Analyzer PMT, Revision 001-01

71152 - Problem Identification and Resolution

Condition Reports

CA3049150 CA3052454 CA3054745 CA3057601

CA3058921 CA3059507 CA3063035 CA3070075

CA3077414 CA3077426 CA3095616 CA3181256

CA7293952 1064033 1067850 1068278

1071653 1071854 1082179 1085886

1087339 1087580 1088044 1089309

1098101 1098321

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

Condition Reports

CA3022216 CA3031774 1024993 1037568

1037601 1039766

Miscellaneous

Post Trip Review Report, dated May 17, 2016

60855.1 - Operation of an Independent Spent Fuel Storage Installation

Miscellaneous

AP-2-18-01, Unit 2 Dry Fuel Storage (ISFSI) ALARA Plan

ETE-NAF-2018-0033, ISFSI Fuel Certification and Loading Map for NUHOMS Canister

MPS32PT-L125-A224-HZ034, Revision 0

OP2209H, Dry Shielded Canister Loading (ISFSI), Revision 006-00