IR 05000317/2021004
| ML22031A173 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 01/31/2022 |
| From: | Brice Bickett NRC/RGN-I/DORS |
| To: | Rhoades D Exelon Generation Co LLC, Exelon Nuclear |
| Bickett B | |
| References | |
| IR 2021004 | |
| Download: ML22031A173 (14) | |
Text
January 31, 2022
SUBJECT:
CALVERT CLIFFS NUCLEAR POWER PLANT, UNITS 1 AND 2 -
INTEGRATED INSPECTION REPORT 05000317/2021004 AND 05000318/2021004
Dear Mr. Rhoades:
On December 31, 2021, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at Calvert Cliffs Nuclear Power Plant, Units 1 and 2. On January 26, 2022, the NRC inspectors discussed the results of this inspection with Mr. Thomas Haaf, Site Vice President, and other members of your staff. The results of this inspection are documented in the enclosed report.
No findings or violations of more than minor significance were identified during this inspection.
This letter, its enclosure, and your response (if any) will be made available for public inspection and copying at http://www.nrc.gov/reading-rm/adams.html and at the NRC Public Document Room in accordance with Title 10 of the Code of Federal Regulations 2.390, Public Inspections, Exemptions, Requests for Withholding.
Sincerely, Brice A. Bickett, Chief Projects Branch 3 Division of Operating Reactor Safety
Docket Nos. 05000317 and 05000318 License Nos. DPR-53 and DPR-69
Enclosure:
As stated
Inspection Report
Docket Numbers:
05000317 and 05000318
License Numbers:
Report Numbers:
05000317/2021004 and 05000318/2021004
Enterprise Identifier: I-2021-004-0125
Licensee:
Exelon Generation Company, LLC
Facility:
Calvert Cliffs Nuclear Power Plant, Units 1 and 2
Location:
Lusby, MD
Inspection Dates:
October 1, 2021 to December 31, 2021
Inspectors:
H. Anagnostopoulos, Senior Health Physicist
R. Clagg, Senior Resident Inspector
C. Lally, Senior Operations Engineer
K. Mangan, Senior Reactor Inspector
S. Obadina, Resident Inspector
Approved By:
Brice A. Bickett, Chief
Projects Branch 3
Division of Operating Reactor Safety
SUMMARY
The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees
performance by conducting an integrated inspection at Calvert Cliffs Nuclear Power Plant,
Units 1 and 2, in accordance with the Reactor Oversight Process. The Reactor Oversight
Process is the NRCs program for overseeing the safe operation of commercial nuclear power
reactors. Refer to https://www.nrc.gov/reactors/operating/oversight.html for more information.
List of Findings and Violations
No findings or violations of more than minor significance were identified.
Additional Tracking Items
Type
Issue Number
Title
Report Section
Status
LER 2021-003-00 for Calvert
Cliffs Nuclear Power Plant,
Unit No. 2, Auxiliary
Feedwater Pump Inoperable
Due to Improper Reset of
Trip Throttle Valve.
Closed
PLANT STATUS
Unit 1 operated at or near rated thermal power for the entire inspection period.
Unit 2 began the inspection period at rated thermal power. On November 21, 2021, a manual reactor trip was inserted due to lowering steam generator water levels. A unit startup was
commenced on November 22, 2021, and the unit was restored to rated thermal power on
November 23, 2021. 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 (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 activities described in IMC 2515,
Appendix D, Plant Status, conducted routine reviews using IP 71152, Problem Identification
and Resolution, observed risk significant activities, and completed on-site portions of IPs. The
inspectors reviewed selected procedures and records, observed activities, and interviewed
personnel to assess licensee performance and compliance with Commission rules and
regulations, license conditions, site procedures, and standards.
REACTOR SAFETY
71111.01 - Adverse Weather Protection
Seasonal Extreme Weather Sample (IP Section 03.01) (1 Sample)
(1)
The inspectors evaluated readiness for seasonal extreme weather conditions prior to
the onset of seasonal cold temperatures for the emergency diesel generators and
intake structure on December 16, 2021.
71111.04 - Equipment Alignment
Partial Walkdown Sample (IP Section 03.01) (3 Samples)
The inspectors evaluated system configurations during partial walkdowns of the following
systems/trains:
(1)
Unit 2, 22 auxiliary feedwater pump during 2A emergency diesel generator out of
service for maintenance, October 7, 2021
(2)
Unit 1, 13 auxiliary feedwater pump during 23 auxiliary feedwater pump out of service
for maintenance, November 16, 2021
(3)
Unit 2, 2A emergency diesel generator during 2B emergency diesel generator out of
service for maintenance, December 13, 2021
71111.05 - Fire Protection
Fire Area Walkdown and Inspection Sample (IP Section 03.01) (5 Samples)
The inspectors evaluated the implementation of the fire protection program by conducting a
walkdown and performing a review to verify program compliance, equipment functionality,
material condition, and operational readiness of the following fire areas:
(1)
Unit 2, service water pump room, fire area 40, October 15, 2021
(2)
Unit 2, 27' and 45' switchgear rooms and purge air room, fire areas 19, 19A, and 34,
November 15, 2021
(3)
Unit 2, auxiliary feedwater pump room, fire area 43, November 19, 2021
(4)
Units 1 and 2, intake structure, intake structure outside, and intake structure pump
room, fire area IS, December 1, 2021
(5)
Units 1 and 2, outside yard area and buildings, includes the fire pump house, fire area
YARD, December 1, 2021
71111.06 - Flood Protection Measures
Inspection Activities - Internal Flooding (IP Section 03.01) (1 Sample)
The inspectors evaluated internal flooding mitigation protections in the:
(1)
Unit 2, 23 service water pump drain overflow and impact to flood hazards analysis,
December 30, 2021
71111.11A - Licensed Operator Requalification Program and Licensed Operator Performance
Requalification Examination Results (IP Section 03.03) (1 Sample)
(1)
The inspectors reviewed and evaluated the licensed operator examination failure
rates for the requalification annual operating exam administered on November 16-18,
2021.
71111.11B - Licensed Operator Requalification Program and Licensed Operator Performance
Licensed Operator Requalification Program (IP Section 03.04) (1 Sample)
(1)
Biennial Requalification Written Examinations
The inspectors evaluated the quality of the licensed operator biennial requalification
written examination administered on November 19, 2021.
Annual Requalification Operating Tests
The inspectors evaluated the adequacy of the facility licensees annual requalification
operating test.
Administration of an Annual Requalification Operating Test
The inspectors evaluated the effectiveness of the facility licensee in administering
requalification operating tests required by Title 10 of the Code of Federal Regulations
55.59(a)(2) and that the facility licensee is effectively evaluating their licensed
operators for mastery of training objectives.
Requalification Examination Security
The inspectors evaluated the ability of the facility licensee to safeguard examination
material, such that the examination is not compromised.
Remedial Training and Re-examinations
The inspectors evaluated the effectiveness of remedial training conducted by the
licensee, and reviewed the adequacy of re-examinations for licensed operators who
did not pass a required requalification examination.
Operator License Conditions
The inspectors evaluated the licensees program for ensuring that licensed operators
meet the conditions of their licenses.
Control Room Simulator
The inspectors evaluated the adequacy of the facility licensees control room
simulator in modeling the actual plant, and for meeting the requirements contained in
Title 10 of the Code of Federal Regulations 55.46.
Problem Identification and Resolution
The inspectors evaluated the licensees ability to identify and resolve problems
associated with licensed operator performance.
71111.11Q - Licensed Operator Requalification Program and Licensed Operator Performance
Licensed Operator Performance in the Actual Plant/Main Control Room (IP Section 03.01) (1 Sample)
(1)
The inspectors observed and evaluated licensed operator performance in the main
control room during the restart of Unit 2 following a manual reactor trip on
November 22, 2021.
Licensed Operator Requalification Training/Examinations (IP Section 03.02) (1 Sample)
(1)
The inspectors observed and evaluated licensed operator simulator training for
Units 1 and 2 involving two dropped control element assemblies, reactor trip, and loss
of offsite power resulting in a declaration of a Site Area Emergency on November 30,
2021.
71111.12 - Maintenance Effectiveness
Maintenance Effectiveness (IP Section 03.01) (2 Samples)
The inspectors evaluated the effectiveness of maintenance to ensure the following
structures, systems, and components (SSCs) remain capable of performing their intended
function:
(1)
Units 1 and 2, maintenance rule periodic a(3) assessment review, November 29,
2021
(2)
Unit 1, AR04452491, 12 battery charger tripped during surveillance testing,
December 7, 2021
Aging Management (IP Section 03.03) (1 Sample)
The inspectors evaluated the effectiveness of the aging management program for the
following SSCs that did not meet their inspection or test acceptance criteria:
(1)
Unit 1, AR04400321, 11A service water heat exchanger plate degradation,
December 30, 2021
71111.13 - Maintenance Risk Assessments and Emergent Work Control
Risk Assessment and Management Sample (IP Section 03.01) (3 Samples)
The inspectors evaluated the accuracy and completeness of risk assessments for the
following planned and emergent work activities to ensure configuration changes and
appropriate work controls were addressed:
(1)
Unit 2, elevated risk condition due to 2A emergency diesel generator out of service
for maintenance, October 7, 2021
(2)
Unit 1, elevated risk condition due to 12 containment spray pump out of service for
maintenance, October 15, 2021
(3)
Unit 2, elevated risk condition due to 23 auxiliary feedwater pump out of service for
maintenance, November 24, 2021
71111.15 - Operability Determinations and Functionality Assessments
Operability Determination or Functionality Assessment (IP Section 03.01) (5 Samples)
The inspectors evaluated the licensee's justifications and actions associated with the
following operability determinations and functionality assessments:
(1)
Units 1 and 2, AR04434456, 0C station blackout diesel output generator cables
wetted during severe weather event, November 15, 2021
(2)
Unit 2, AR04451565, water hammer in 2A and 2B emergency diesel generator
service water control valve loops, December 1, 2021
(3)
Unit 1, AR04460943, 1A emergency diesel generator 1A2 engine high temperature
heater not working, December 1, 2021
(4)
Unit 2, AR04453202, 2A emergency diesel generator tripped outside normal setpoint
range during overspeed trip testing, December 2, 2021
(5)
Unit 2, AR04448267, 2A emergency diesel generator low starting air pressure alarm
received, December 6, 2021
71111.18 - Plant Modifications
Temporary Modifications and/or Permanent Modifications (IP Section 03.01 and/or 03.02) (1 Sample)
The inspectors evaluated the following temporary or permanent modifications:
(1)
Unit 2, ECP-21-000069, permanent modifications to revise main vent radiation
monitor high flow setpoint to prevent spurious trips of the 21 radiation monitoring
system pump, December 28, 2021
71111.19 - Post-Maintenance Testing
Post-Maintenance Test Sample (IP Section 03.01) (5 Samples)
The inspectors evaluated the following post-maintenance test activities to verify system
operability and functionality:
(1)
Unit 2, WO C93803998, 22A service water heat exchanger maintenance, October 27,
2021
(2)
Unit 2, WO C93761654, 2A emergency diesel generator maintenance and testing,
November 2, 2021
(3)
Unit 2, WO C93771477, 23 auxiliary feedwater pump maintenance, November 19,
2021
(4)
Unit 2, WO C93775334, 2B emergency diesel generator maintenance and testing,
December 30, 2021
(5)
Units 1 and 2, WO C93679484, 12 spent fuel pool cooling pump maintenance and
testing, December 30, 2021
71111.22 - Surveillance Testing
The inspectors evaluated the following surveillance tests:
Surveillance Tests (other) (IP Section 03.01) (2 Samples)
(1)
Unit 2, STP-O-731-2, "22 High Pressure Safety Injection Pump and Check Valve
Quarterly Operability Test, Revision 13, November 8, 2021
(2)
Unit 2, STP-M-212A, "Channel 'A' Reactor Protective System Functional Test,"
Revision 02000, December 8, 2021
RADIATION SAFETY
71124.06 - Radioactive Gaseous and Liquid Effluent Treatment
Walkdowns and Observations (IP Section 03.01) (4 Samples)
The inspectors evaluated the following radioactive effluent systems during walkdowns:
(1)
Unit 1, wide range noble gas effluent radiation monitor
(2)
Unit 2, wide range noble gas effluent radiation monitor
(3)
Unit 1, plant vent stack and associated effluent sampling ports
(4)
Unit 2, plant vent stack and associated effluent sampling ports
Sampling and Analysis (IP Section 03.02) (4 Samples)
Inspectors evaluated effluent samples, sampling processes and compensatory samples, as
available. Specifically:
(1)
The inspectors observed a routine sample of the Units 1 and 2 waste gas surge tank.
(2)
The inspectors observed a routine sample of the 11 waste gas decay tank.
(3)
The inspectors inspected the sample piping and associated heat tracing on the Unit 2
wide range noble gas effluent radiation monitor.
(4)
The inspectors reviewed the results of sampling under Title 10 of the Code of Federal
Regulations Part 61 to verify that effluent waste streams were appropriately
characterized.
Dose Calculations (IP Section 03.03) (2 Samples)
The inspectors evaluated the following dose calculations:
(1)
Discharge permit for the Unit 1 plant vent for the month of September 2021
(2)
Discharge permit for the Units 1 and 2 reactor coolant waste monitoring tank
71124.08 - Radioactive Solid Waste Processing & Radioactive Material Handling, Storage, &
Transportation
Radioactive Waste System Walkdown (IP Section 03.02) (2 Samples)
Inspectors walked down accessible portions of the radioactive waste systems and evaluated
system configuration and functionality, including:
(1)
The reactor coolant waste evaporator pre-filter
(2)
The 12 reactor coolant waste monitoring tank
OTHER ACTIVITIES - BASELINE
71151 - Performance Indicator Verification
The inspectors verified licensee performance indicators submittals listed below:
IE01: Unplanned Scrams per 7000 Critical Hours Sample (IP Section 02.01) (2 Samples)
(1)
Unit 1, October 1, 2020 - September 30, 2021
(2)
Unit 2, October 1, 2020 - September 30, 2021
IE03: Unplanned Power Changes per 7000 Critical Hours Sample (IP Section 02.02) (2 Samples)
(1)
Unit 1, October 1, 2020 - September 30, 2021
(2)
Unit 2, October 1, 2020 - September 30, 2021
IE04: Unplanned Scrams with Complications (USwC) Sample (IP Section 02.03) (2 Samples)
(1)
Unit 1, October 1, 2020 - September 30, 2021
(2)
Unit 2, October 1, 2020 - September 30, 2021
OR01: Occupational Exposure Control Effectiveness Sample (IP Section 02.15) (1 Sample)
(1)
September 2020 through September 2021
PR01: Radiological Effluent Technical Specifications/Offsite Dose Calculation Manual
Radiological Effluent Occurrences (RETS/ODCM) Radiological Effluent Occurrences Sample
(IP Section 02.16) (1 Sample)
(1)
September 2020 through September 2021
71152 - Problem Identification and Resolution (PI&R)
Semiannual Trend Review (IP Section 02.02) (1 Sample)
(1)
The inspectors reviewed the licensees corrective action program for potential
adverse trends that might be indicative of a more significant safety issue.
Annual Follow-up of Selected Issues (IP Section 02.03) (3 Samples)
The inspectors reviewed the licensees implementation of its corrective action program
related to the following issues:
(1)
Units 1 and 2, review the evaluation and corrective actions for NCV 05000317;
318/2018004-01, failure to store and maintain FLEX equipment such that reliable
starting is reasonably assured during extreme cold, and OpESS 2020/01 FLEX
equipment design control, maintenance, and testing, December 20, 2021
(2)
Unit 2, review the evaluation and corrective actions for repeat identifications of
adverse conditions for 23 saltwater pump thrust bearing high temperature
(AR04379171, AR04346113), November 3, 2021
(3)
Unit 2, review the evaluation and corrective actions for clogging of the floor drain on
the south side of the 23 service water pump (AR01798703, AR03986363),
December 30, 2021
71153 - Follow Up of Events and Notices of Enforcement Discretion
Event Report (IP Section 03.02) (1 Sample)
The inspectors evaluated the following licensee event reports (LERs):
(1)
LER 05000318/2021-003-00, Auxiliary Feedwater Pump Inoperable Due to Improper
Reset of Trip Throttle Valve (Agencywide Documents Access and Management
System (ADAMS) Accession No. ML21271A066). The inspection details and
conclusions associated with this LER were previously documented in Inspection
Report 05000317;318/2021002 under the Inspection Results Section.
Personnel Performance (IP Section 03.03) (1 Sample)
(1)
The inspectors evaluated a loss of 21 steam generator feed pump, Unit 2 manual reactor trip, and the licensees performance on November 21, 2021.
INSPECTION RESULTS
Observation: Review the Evaluations and Corrective Actions of the Licensee in
Response to Identification of Adverse Conditions for the 23 Saltwater Pump
Following Pump Replacement
The inspectors reviewed the licensees evaluations and corrective actions in response to
identification of adverse conditions for the 23 saltwater pump following pump replacement.
Corrective actions were performed following the identification of a rising thrust bearing
temperature trend for the 23 "swing" saltwater pump. Licensee staff identified, following the
overhaul of the pump in May 2020, a higher-than-expected temperature reading for the
bearing. The issue was entered into the corrective action program (AR04346113).
The inspectors noted that licensee staff evaluated the bearing temperature and established
operability limits for the maximum allowable bearing temperature. Troubleshooting activities
determined that the most likely cause was a bend in the 16-foot vertical shaft that coupled the
motor to the pump. In October 2020, licensee staff declared the pump inoperable when the
bearing temperature reached established limits. In December 2020, the licensee replaced
the shaft and restored the 23 saltwater pump to service. Post-maintenance testing of the
pump found that vibration and temperature measurements associated with the bearing had
returned to levels comparable to the other five saltwater pumps installed at the Calvert Cliffs
Units 1 and 2. Additionally, licensee staff updated the pump overhaul procedure to measure
the shaft deflection to determine if it met industry standards.
The inspectors reviewed the work order that determined the installed shaft was bent and
installed the new shaft. The inspectors reviewed the post-maintenance testing of the 23
saltwater pump after installation of the new shaft and reviewed current bearing temperatures
of all six saltwater pumps and noted the licensee identified the deficiencies that caused the
high bearing temperature.
The inspectors did not identify any findings or violations of more than minor significance.
Observation: Semi-Annual Trend Review
The inspectors performed a semi-annual review of site issues, as required by Inspection
Procedure 71152, "Problem Identification and Resolution," to identify trends that might
indicate the existence of more significant safety issues. An adverse trend was identified by
the licensee due to several configuration control issues, which were entered into their
corrective action program in order to be appropriately addressed. The first example occurred
on August 17, 2021, and is documented in AR04441204. Specifically, electricians were
tasked with lifting leads on the 14 diesel fire pump, which is the owner-controlled area fire
pump. The electricians proceeded to lift leads on the 12 diesel fire pump, which is the
protected area fire pump. The station entered a technical requirements manual action
statement and declared the 12 fire pump non-functional. A prompt investigation was
performed and determined that technicians failed to stop when the component ID listed in the
clearance order did not match the component ID in the field. The second example occurred
on August 17, 2021, and is documented as observation 2021-268089. Specifically, during the
installation of a flowmeter to support charging pump performance testing, the licensee
installed the flowmeter on the incorrect pump. The licensee determined that first time
performance and inadequate labeling led to the error. The third example occurred on
September 23, 2021, and is documented in ARs 04448267 and 04448295. Specifically, after
completion of the leak rate testing of the starting air receiver inlet check valves, the starting
air compressor was left in the Off position instead of automatic. The licensee was alerted to
the condition when an unexpected alarm was received in the control room indicating an issue
with the 2A emergency diesel generator. Operators were dispatched to the diesel and
identified that the starting air compressor was in the Open/Off position. A prompt investigation
was performed, and the licensee determined that the compressor was supposed to be
returned to the On position by operations but was instead signed for by the technician and not
completed. These deficiencies demonstrate an adverse trend with regards to configuration
control and the licensee generated ARs 04449058, 04448888, and 04449081 to address the
deficiencies. No additional trends were identified. The corrective actions included improved
labeling, cross functional observation of maintenance activities focused on human
performance and verification activities, performing a review of all maintenance work
instructions for proper verification practices, and establishing configuration control as a
maintenance focus area.
The inspectors did not identify any findings or violations of more than minor significance.
Observation: Review the Evaluations and Corrective Actions for Clogging of the
Floor Drain on the South Side of the 23 Service Water Pump
The inspectors reviewed the licensee's evaluation and corrective actions for the clogging of
the 23 service water pump floor drain and the degradation of the other floor drains in the
service water pump rooms. The identified degradation of the Unit 2 service water pump room
floor drains is documented in AR02539814, AR03986363, and AR03986907. The service
water pump room has several floor drains that are equipped with float valves. On several
occasions a pool of water was identified near one of the drains. This typically occurs when
the licensee cleans the service water heat exchangers since the water is directed to the floor
drains in the room. The licensee performed borescope inspections, which determined that the
drain was clogged with concrete. In order to improve flow, the licensee performed
hydrolazing, which resulted in a slight increase in flow.
The inspectors reviewed the licensees flood hazards analysis and determined there were no
impacts due to the fact that the floors drains are not credited. In addition, the drains are
equipped with float valves that prevent water from the turbine building sump from entering the
service water pump room. In discussion with licensee personnel and review of work orders,
the inspectors determined that the floats are cleaned and inspected every two years. In
addition, the valve seating surface is ensured to be debris free in order to ensure proper
sealing in the event of backflow from the turbine building sump. The inspectors also reviewed
the licensees control room alarm response procedures associated with a leak in the service
water pump room and identified no impacts. The licensees interim corrective actions include
redirecting water from the 23 service water pump floor drain to the other drains in the room.
The licensee has also stationed a pump in the room in order to pump water from the 23
service water pump floor drain to another drain. This prevents the water from creating a
puddle around the floor drain. In addition, the licensees long term corrective actions include
repair of the drain.
The inspectors did not identify any findings or violations of more than minor significance.
Observation: Review the Evaluations and Corrective Actions for NCV
05000317;318/2018-0004-01, Failure to Store and Maintain FLEX Equipment
Such that Reliable Starting is Reasonably Assured During Extreme Cold
The inspectors reviewed the licensee's evaluation and corrective actions associated with
the failure to store and maintain FLEX equipment such that reliable starting is reasonably
assured during extreme cold. The inspectors reviewed licensee corrective action documents
and noted that the licensees corrective actions for this issue included adding a fuel additive
to FLEX diesel equipment and diesel fuel oil storage tanks to ensure the continued reliability
of the equipment. The inspectors reviewed the licensees evaluation and completed licensee
work orders to verify that a suitable fuel additive was chosen and subsequently added to the
appropriate equipment and storage tanks.
The inspectors did not identify any findings or violations of more than minor significance.
EXIT MEETINGS AND DEBRIEFS
The inspectors verified no proprietary information was retained or documented in this report.
- On January 26, 2022, the inspectors presented the integrated inspection results to
Mr. Thomas Haaf, Site Vice President, and other members of the licensee staff.
On October 29, 2021, the inspectors presented the radioactive gaseous and liquid
effluent treatment inspection results to Mr. Thomas Haaf, Site Vice President, and other
members of the licensee staff.