IR 05000317/2018002
| ML18219A427 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 08/02/2018 |
| From: | Christopher Cahill NRC Region 1 |
| To: | Bryan Hanson Exelon Generation Co |
| References | |
| IR 2018002 | |
| Download: ML18219A427 (12) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION REGION I 2100 RENAISSANCE BOULEVARD, SUITE 100 KING OF PRUSSIA, PA 19406-2713 August 2, 2018 Mr. Bryan Senior Vice President, Exelon Generation Company, LLC President and Chief Nuclear Officer, Exelon Nuclear 4300 Winfield Road Warrenville, IL 60555 SUBJECT: CALVERT CLIFFS NUCLEAR POWER PLANT
- INTEGRATED INSPECTION REPORT 05000317/201 800 2 AND 05000318/20 1 800 2
Dear Mr. Hanson:
On June 30, 201 8, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Calvert Cliffs Nuclear Power Plant (CCNPP), Units 1 and 2.
O n July 18 , 2018, the NRC inspectors discussed the results of this inspection with Mr. Todd Tierney , Plant Manager, 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/ Christopher Cahill , Acting Chief Reactor Projects Branch 1 Division of Reactor Projects Docket Nos. 5 0-317 and 50-318 License Nos.
D PR-53 and DPR-69
Enclosure:
Inspection Report 05000317/201 8002 and 05000318/20 1 800 2
REGION I Docket Numbers: 50-317 and 50-318 License Numbers: DPR-53 and DPR-69 Report Numbers: 05000317/201 800 2 and 05000318/201 800 2 Enterprise Identifier:
I-2018-002-0055 Licensee: Exelon Generation Company, LLC Facility: Calvert Cliffs Nuclear Power Plant, Units 1 and 2 Location: Lusby, MD Inspection Dates: April 1, 2018 to June 3 0, 2018 Inspectors
- R. Clagg, Senior Resident Inspector C. Roettgen, Resident Inspector S. Obadina, Acting Resident Inspector H. Anagnostopoulos, Senior Health Physicist A. Rosebrook, Senior Project Engineer Approved by:
Christopher Cahill , Acting Chief Reactor Projects Branch 1 Division of Reactor Projects
2 SUMMARY The U.S. Nuclear Regulatory Commission (NRC) continued monitoring Exelon Generation Company's, LLC (Exelon) performance at Calvert Cliffs Nuclear Power Plant (CCNPP), Units 1 and 2 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. No findings or more-than-minor violations were identified.
3 REPORT DETAILS PLANT STATUS Unit 1 began the inspection period at 50 percent rated thermal power to repair a main turbine control valve. The unit was returned to full power on April 1, 2018. On May 26, 2018, the unit was down powered to 80 percent to support main turbine control valve and heater drain tank normal level control valve maintenance. The unit was returned to rated thermal power the same day and remained at or near rated thermal power for the remainder of the inspection period.
Unit 2 began the inspection period at rated thermal power. On April 26, 2018, the unit was down powered to 12 percent due to reactor coolant system leakage from a reactor coolant pump seal stage cavity pressure transmitter sensing line. The leak was isolated and the unit was returned to rated thermal power the same day. The unit remained at or near rated thermal power for the remainder of the inspection period.
INSPECTION SCOPES Inspections were conducted using the appropriate portions of the inspection procedures (IP) 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, "Ligh t-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 Exelon's performance and compliance with Commission rules and regulations, license conditions, site procedures, and standards.
REACTOR SAFETY 71111.01 - Adverse Weather Protection Summer Readiness (1 sample) The inspectors evaluated summer readiness of offsite and alternate AC power systems
. Seasonal Extreme Weather (1 sample)
The inspectors evaluated readiness for seasonal extreme weather conditions prior to the onset of seasonal high temperatures.
Impending Severe Weather (1 sample) The inspectors evaluated readiness for impending adverse weather conditions for forecasted high winds, May 14, 2018
.
4 71111.04 - Equipment Alignment Partial Walkdown (4 samples) The inspectors evaluated system configurations during partial walkdowns of the following systems/trains:
(1) 22 emergency core cooling system train during 21 emergency core cooling system room air cooler out of service for maintenance, April 5, 2018 (2) 11 auxiliary feedwater system during 12 auxiliary feedwater system out of service for maintenance, April 30, 2018 (3) Unit 2 saltwater system during saltwater through wall leak and repair, May 24, 2018 (4) Units 1 and 2, emergency diesel generator during 0C diesel generator out of service for maintenance, June 5, 2018 Complete Walkdown (1 sample)
The inspectors evaluated system configurations during a complete walkdown of the accessible portions of the Unit 1 service water system, June 21, 2018.
71111.05Q
- Fire Protection Quarterly Quarterly Inspection (5 samples) The inspectors evaluated fire protection implementation in the following selected areas:
(1) Unit 2, 27' switchgear room, purge air room, and 45' switchgear room, fire areas 18, 18A, and 25, May 16, 2018 (2) Units 1 and 2, component cooling water pump rooms and 5' fan rooms, fire areas 12-15, May 21, 2018 (3) Unit 2, service water pump room, fire area 40, June 5, 2018 (4) Cable chase 1A, 1B, 2A, 2B , and control room complex, fire areas 20-24, June 7, 2018 (5) 2B, 1B, and 2A emergency diesel generator rooms, fire areas 28-31, June 13, 2018 Annual Inspection (1 sample)
The inspectors evaluated fire brigade performance, May 24, 2018.
71111.0 7 - Heat Sink Performance Heat Sink (1 sample)
The inspectors evaluated 12 A/B service water heat exchangers
.
5 71111.11 - Licensed Operator Requalification Program and Licensed Operator Performance Operator Requalification (1 sample)
The inspectors observed and evaluated a crew of licensed operators in the plant's simulator during licensed operator requalification training involving the loss of instrument bus 1Y01, anticipated transient without scram, and an emergency action level entry due to failure of automatic trip signal, April 17, 2018.
Operator Performance (1 sample) The inspectors observed and evaluated licensed operators during a Unit 1 downpower in response to increased reactor cooling system leakage, April 26, 2018.
71111.12 - Maintenance Effectiveness Routine Maintenance Effectiveness (2 sample s) The inspectors evaluated the effectiveness of routine maintenance activities associated with the following equipment and/or safety significant functions:
(1) Action Request (AR)
04101315, a maintenance rule (a)(1) determination is required for system 084C fuel assemblies, May 30, 2018 (2) AR04094062, a maintenance rule (a)(1) determination for loss of motor control center 117T due to tripped supply breaker, June 4, 20 18 71111.13 - Maintenance Risk Assessments and Emergent Work Control (7 samples) The inspectors evaluated the risk assessments for the following planned and emergent work activities:
(1) Unit 2, updated maintenance risk assessment associated with increased reactor coolant system leakage and unit downpower, April 26, 2018 (2) Units 1 and 2, updated maintenance risk assessment for forecasted high winds and Yellow risk condition, May 14, 2018 (3) Unit 2, maintenance risk assessment for 23 auxiliary feedwater pump recirculation check valve maintenance and Yellow risk condition, May 23, 2018 (4) Unit 2, updated maintenance risk assessment for saltwater through wall leak repair, May 24, 2018 (5) Unit 1, maintenance risk assessment for 11A service water heat exchanger cleaning, May 31, 2018 (6) Units 1 and 2, maintenance risk assessment and fire risk management actions for 0C diesel generator out of service for maintenance, June 5, 2018 (7) Units 1 and 2, maintenance risk assessment for 22 boric acid pump out of service for maintenance, June 12, 2018 71111.15 - Operability Determination and Functionality Assessments (8 samples) The inspectors evaluated the following operability determinations and functionality assessments:
6 (1) AR04125265, Engineering Change Package (ECP)-18-000247, Revision 0
, evaluate non-safety related low voltage copper plates on safety related U-440-14A and U-440-11B transformers, April 12, 2018 (2) AR04129846, 11 service water pump inboard bearing oil cloudy, May 4, 2018 (3) AR04140211, Unit 2 saltwater bypass control valve not responding to controller, June 7, 2018 (4) AR041337878, 12 saltwater pump declining trend in differential pressure, June 9, 2018 (5) AR04137474, Units 1 and 2 saltwater subsystems non-conforming condition, June 15, 2018 (6) AR04139484, Unit 2 reactor protection system channel D, wide range nuclear instrumentation failed low, June 19, 2018 (7) AR04138657, Unit 2 saltwater through wall leak and repair, June 28, 2018 (8) AR04151244, material defect discovered during failure analysis of 1MOV 4142, 11 refueling water tank discharge motor operated valve hand switch, June 29, 2018 71111.18 - Plant Modifications (1 sample) The inspectors evaluated the following temporary or permanent modifications:
(1) ECP-17-000038, switchgear room roll up door I-beam modification 71111.19 - Post-Maintenance Testing (8 samples) The inspectors evaluated post-maintenance testing for the following maintenance/repair activities:
(1) Work Order (WO) C93550610, 1 C V 4511 , 11 steam generator turbine driven auxiliary feedwater flow control valve positioner, April 10, 2018 (2) WO C93611951, perform the speed control knob check of the 12 auxiliary feedwater turbine governor, April 23, 2018 (3) WO C93643987 and C93614212, 11 service water heat exchanger plenum cleaning and inspection, May 2, 2018 (4) WO C93616509, stroke test of 22 emergency core cooling system air cooler saltwater inlet valve, May 31, 2018 (5) WO C93589470, C93589471, 23 auxiliary feedwater pump test after maintenance on recirculation check valve, June 9, 2018 (6) WO C93617411, replace 2RV150, boric acid pump 22 mini flow relief valve, June 12, 2018 (7) WO C93666942, C93666944, inspection for leakage after replacement spool piece installed due to saltwater through wall leak and repair, June 2 8, 2018 (8) WO C93533814, engineered safety features actuation system time response testing for 2B emergency diesel generator, June 28, 2018
7 71111.22 - Surveillance Testing The inspectors evaluated the following surveillance tests:
Routine (4 samples) (1) OI-21C, "0C Diesel Generator," Revision 28, April 4, 2018 (2) STP-M-528-0, "Control Room HVAC System Inleakage Test," Revision 0, April 5, 2018 (3) STP-O-8B2 YR-1, "Biennial Test of 1B EDG," Revision 0, April 10, 2018 (4) STP-O-8A-2, "Test of 2A DG and 4kV UV," Revision 31, May 30, 2018 In-service (1 sample)
(1) STP-M-031-0, "Relief Valve Testing and Setting, 2RV150 Boric Acid Pump 22 Mini Flow Relief Valve," Revision, 009, June 12, 2018 71114.06 - Drill Evaluation Emergency Planning Drill (1 sample)
The inspectors observed and evaluated the conduct of a routine emergency preparedness drill , involving severe weather, bay water level low tide, loss of coolant accident, and cold leg shear resulting in a General Emergency declaration, May 22, 2018.
Drill/Training Evolution (1 sample)
The inspectors observed and evaluated the conduct of a simulator training evolution involving a main steam leak, failure of the reactor to scram, auxiliary feedwater pump failure, and failure of containment resulting in a General Emergency declaration, April 3, 2018. RADIATION SAFETY 71124.03 - In-Plant Airborne Radioactivity Control and Mitigation Engineering Controls (1 Sample)
The inspectors evaluated airborne controls and monitoring
. Use of Respiratory Protection Devices (1 Sample)
The inspectors evaluated respiratory protection
. Self-Contained Breathing Apparatus for Emergency Use (1 Sample)
The inspectors evaluated the Exelon self-contained breathing apparatus program.
8 OTHER ACTIVITIES
- BASELINE 71151 - Performance Indicator Verification The inspectors verified Exelon performance indicators submittals listed below for the period April 1, 2017, through March 31, 2018. (2 samples) (1) Unit s 1 and 2 Safety System Functional Failures 71152 - Problem Identification and Resolution Semiannual Trend Review (1 sample)
(1) The inspectors reviewed Exelon's operability determinations since 2015 for trends that might be indicative of a more significant safety issue.
71153 - Follow-Up of Events and Notices of Enforcement Discretion Events (1 sample)
The inspectors evaluated Exelon's response to Unit 2 reactor coolant system leakage from a reactor coolant pump seal stage cavity pressure transmitter sensing line, unit downpower, and the leak isolation , April 26, 2018.
INSPECTION RESULTS Observation 71152 Semi-Annual Trend The inspectors reviewed operability determinations documented in the corrective action program for the past three years to determine if Exelon properly evaluat ed the operability of safety related systems, structure s , and components, specifically with regard to the effect discovered issues would have on the performance of equipment throughout the duration of time it would be required to fulfill its safety function after an accident. This time is known as the mission time. The inspectors found eleven operability determinations which explicitly used or implied the use of incorrect mission times. Six of these operability determinations had occurred in the first two quarters of 2018. The mission times used were generall y 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, which is the mission time associated with the mitigating systems performance indicator, but is not appropriate for use in determining operability of equipment. The inspectors challenged Exelon on the eleven operability determinations. Exelon acknowledged that incorrect mission times had been used and conducted operability determinations for the equipment issues that were still open in the corrective action program using appropriate mission times. All of the revised operability determinations still resulted in the equipment being declared operable.
The inspectors also determined that four of the eleven operability determinations would have required operator actions to refill oil reservoirs in order to ensure the component's mission time could be met.
The inspectors reviewed the equipment histories, including oil addition logs, condition reports, and operations department log entries, as well as Exelon's corrective actions for the issues and determined that all four issues were minor. These issues were minor based on the fact that all were identified and corrected promptly within a small fraction 9 of the equipment's associated technical specification allowed outage times, operators action met the criteria in IMC 0326 for crediting manual actions in lieu of automatic functions
, and there was no evidence that the component's ability to perfo rm its safety function was adversely impacted. Exelon initiated AR04157943 to further investigate the issues identified by the inspectors. EXIT MEETINGS AND DEBRIEFS The inspectors verified no proprietary information was retained or documented in this report.
On April 27, 2018, the inspectors presented the inspection results associated with IP 71124.03 to Mr. Mark Flaherty, Site Vice President, and other members of the Exelon staff. On July 18 , 2018, the inspectors presented the quarterly resident inspector inspection results to Mr. Todd Tierney , Plant Manager, and other members of the Exelon staff.
10 List of Documents Reviewed Section 71152
- Problem Identification and Resolution Procedures OP-AA-108-115, Operability Determinations, Revision 20 Action Requests 02532177 02592422 02667366 02735569 02738533 04095258 04125023 04118845 04118841 04118586 04118583 04040543 Miscellaneous Oil addition logs for Auxiliary Feedwater pumps and Service Water Pumps from 2015 through 2018 Operations Narrative logs for various dates from 2015 through 2018 W/O C93226398 Drawing 12310-0056, Lube Oil Tank (275 gal) Application, Revision 0 ECP-18-000314, Technical Evaluation of Safety Injection Pump Motor oil leakage, Revision 0 Calvert Cliffs Nuclear Power Plant Updated Final Safety Analysis Report, Revision 50