ML20364A245
| ML20364A245 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 12/29/2020 |
| From: | O'Dwyer G Division of Reactor Safety III |
| To: | Bryan Hanson Exelon Generation Co, Exelon Nuclear |
| References | |
| IR 2021002 | |
| Download: ML20364A245 (9) | |
See also: IR 05000373/2021002
Text
December 29, 2020
Mr. Bryan C. Hanson
Senior VP, Exelon Generation Company, LLC
President and CNO, Exelon Nuclear
4300 Winfield Road
Warrenville, IL 60555
SUBJECT: LASALLE COUNTY STATION UNITS 1 AND 2 - NOTIFICATION OF AN NRC
TRIENNIAL HEAT SINK PERFORMANCE INSPECTION AND REQUEST FOR
INFORMATION; INSPECTION REPORT 05000373/2021002;
Dear Mr. Hanson:
On April 5, 2021, the U.S. Nuclear Regulatory Commission (NRC) will begin the onsite portion
of the Triennial Heat Sink Performance Inspection at your Lasalle County Nuclear Power Plant.
This inspection will be performed in accordance with NRC baseline Inspection Procedure 71111.07.
In order to minimize the impact that the inspection has on the site and to ensure a productive
inspection, we have enclosed a request for documents needed for the inspection. The
documents have been divided into three groups.
- The first group lists information necessary for our initial inspection scoping activities. This
information should be available to the lead inspector no later than February 8, 2021. By
February 19, 2021, the inspector will communicate the initial selected set of approximately
2-3 risk significant heat exchangers.
- The second group is needed to support our in-office preparation activities. This set of
documents, including the calculations associated with the selected heat exchangers, should
be available at the Regional Office no later than March 15, 2021. This information should be
separated for each selected component, especially if provided electronically (e.g., folder with
component name that includes calculations, condition reports, maintenance history, etc.).
During the in-office preparation activities, the inspector may identify additional information
needed to support the inspection.
- The last group includes the additional information above as well as plant specific reference
material. This information should be available to the inspector on March 22, 2021. It is also
requested that corrective action documents and/or questions developed during the
inspection be provided to the inspector as the documents are generated.
B. Hanson -2-
All requested documents are to be for the time period from the onsite inspection period back to
the documents that were provided in response to the previous Heat Sink Performance
Inspection. If no activities were accomplished in that time period, then the request applies to the
last applicable document in the previous time period. It is important that these documents be as
complete as possible, in order to minimize the number of documents requested during the
preparation week or during the onsite inspection.
The lead inspector for this inspection is Gerard ODwyer. We understand that our licensing
contact for this inspection is Jereme Greenblott of your organization. If there are any questions
about the inspection or the material requested in the enclosure, please contact the lead
inspector at 630-829-9624 or via e-mail at Gerard.ODwyer@nrc.gov.
This letter does not contain new or amended information collection requirements subject to the
Paperwork Reduction Act of 1995 (44 U.S.C. 3501 et seq.). Existing information collection
requirements were approved by the Office of Management and Budget, Control Number
3150-0011. The NRC may not conduct or sponsor, and a person is not required to respond to,
a request for information or an information collection requirement unless the requesting
document displays a currently valid Office of Management and Budget Control Number.
In accordance with Title 10 of the Code of Federal Regulations (10 CFR) 2.390, Public
Inspections, Exemptions, Requests for Withholding, of the NRC's "Rules of Practice," a copy of
this letter and its enclosure will be available electronically for public inspection in the NRC Public
Document Room or from the Publicly Available Records (PARS) component of NRCs
Agencywide Documents Access and Management System (ADAMS). ADAMS is accessible
from the NRC Web site at http://www.nrc.gov/reading-rm/adams.html (the Public Electronic
Reading Room).
Sincerely,
/RA/
Gerard ODwyer, Reactor Engineer
Engineering Branch 2
Division of Reactor Safety
Docket Nos. 50-373; 50-374
Enclosure:
Triennial Heat Sink Performance Inspection
Document Request
cc: Distribution via LISTSERV
B. Hanson -3-
Letter to Bryan C. Hanson from Gerard ODwyer dated December 29, 2020.
SUBJECT: LASALLE COUNTY STATION UNITS 1 AND 2 - NOTIFICATION OF AN NRC
TRIENNIAL HEAT SINK PERFORMANCE INSPECTION AND REQUEST FOR
INFORMATION; INSPECTION REPORT 05000373/2021002;
DISTRIBUTION:
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RidsNrrPMLaSalle Resource
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Kenneth OBrien
DRPIII
DRSIII
ADAMS Accession Number: ML20364A245
Publicly Available Non-Publicly Available Sensitive Non-Sensitive
OFFICE RIII
NAME GODwyer:mb
via e-mail
DATE 12/29/2020
OFFICIAL RECORD COPY
TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST
Inspection Report: 05000373/2021002; 05000374/2021002
Inspection Dates: April 5 - 9, 2021
Inspection Procedure: IP 71111.07, Heat Sink Performance
Lead Inspector: Gerard ODwyer
630-829-9624
Gerard.ODwyer@nrc.gov
I. Information Requested By February 8, 2021
1. List of the Generic Letter (GL) 89-13, Service Water System Problems Affecting
Safety-Related Equipment, heat exchangers in order of risk significance.
2. Copy of heat exchanger performance trending data tracked for each GL 89-13 heat
exchanger.
3. List of corrective action program documents (with a short description) associated
with GL 89-13 heat exchangers, heat sinks, silting, corrosion, fouling, or heat
exchanger testing, for the previous three years or since the last corrective action
program document list was sent to the NRC for the previous heat sink performance
inspection. The list should include all corrective action program documents not on
the last corrective action program document list.
4. Copy of any self-assessment done on any of GL 89-13 heat exchangers.
5. Last two System Health Report(s) and maintenance rule system notebooks for all the
GL 89-13 heat exchangers.
6. List of engineering-related operator workarounds (with a short description)
associated with GL 89-13 heat exchangers. The requested documents are to be for
the time period from the onsite inspection period back to the documents that were
provided in response to the previous heat sink performance inspection.
7. List of permanent and temporary modifications (with a short description) associated
with GL 89-13 heat exchangers. The requested documents are to be for the time
period from the onsite inspection period back to the documents that were provided in
response to the previous heat sink performance inspection.
II. Information Requested By March 15, 2021
1. Copies of the GL 89-13 responses.
2. Copy of the Updated Final Safety Analysis Report (UFSAR) section applicable to the
GL 89-13 Heat Exchanger Program.
Enclosure
TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST
3. Copies of procedures developed to implement the recommendations of GL 89-13
(e.g. the GL 89-13 Heat Exchanger Program description).
4. Copies of the selected corrective action program documents.
5. For the specific heat exchangers selected:
a. Copies of the UFSAR sections applicable for each heat exchanger.
b. Copy of system description and design basis document for the heat exchangers
(as applicable).
c. Provide a list of calculations (with a short description) which currently apply to
each heat exchanger.
i. Establish the limiting design basis heat load required to be removed by
each of these heat exchangers;
ii. Demonstrate the heat exchangers capacity to remove the limiting heat
load;
iii. Correlate surveillance testing and/or inspection results from these heat
exchangers with design basis heat removal capability (e.g., basis for
surveillance test and/or inspection acceptance criteria);
iv. Evaluate the potential for water hammer in each heat exchanger or
associated piping; and
v. Evaluate excessive tube vibration in each heat exchanger.
d. Copy of any operability determinations or other documentation of degradation
associated with the heat exchangers or the systems that support the operation
for the selected heat exchangers.
e. Copy of the construction code, Design Specification, heat exchanger data
sheets, and vendor documents including component drawings applicable for the
heat exchangers.
f. Copies of normal, abnormal, and emergency operating procedures associated
with the selected heat exchangers.
6. For the ultimate heat sink (UHS) and the safety-related service water system (or
equivalent):
a. Copies of the applicable UFSAR sections.
b. Copy of system description and design basis document (as applicable).
c. Copy of any operability determinations or other documentation of degradation
associated with the UHS and the safety-related service water system.
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TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST
d. Copy of the document (e.g. UFSAR, Technical Requirements Manual or
procedure) that states the maximum cooling water system inlet temperature limit
that still allows full licensed power operation of the nuclear reactor.
e. Copy of system description and design basis document (as applicable).
f. Copy of the construction code and Design Specification.
g. Copies of normal, abnormal, and emergency operating procedures associated
with the UHS and safety-related service water systems including procedures for
loss of these systems.
h. Copies of corrective action documents associated with water hammer or
hydraulic transients in the service water system since the last Heat Sink
Inspection.
i. Provide an electronic copy of piping and instrumentation diagrams (P&IDs) for
the service water system, including the intake structure.
j. Provide a list of calculations (with a short description), which currently apply to
UHS and safety-related service water system.
k. Provide a list of instruments (with a short description) associated with automatic
or alarm functions for the safety-related service water system and/or UHS.
l. Provide a list of any design change (with a short description) performed on the
UHS or safety-related service water system since the last heat sink performance
inspection.
7. A schedule of all inspections, cleanings, maintenance, or testing of any
safety-related plant heat exchanger to be performed during the on-site portion of the
inspection.
III. Information Requested to Be Available for Inspection Preparation, March 22, 2021
1. For the specific heat exchangers selected:
a. Copy of the calculation which correlates surveillance testing results from these
heat exchangers with design basis heat removal capability (e.g. basis for
surveillance test acceptance criteria).
b. Copies of the two most recent completed tests and evaluation data confirming
thermal performance for those heat exchangers which are performance tested.
c. Documentation and procedures that identify the types, accuracy, and location of
any special instrumentation used for the two most recently completed thermal
performance tests for the heat exchangers (e.g., high accuracy ultrasonic flow
instruments or temperature instruments). Include calibration records for the
instruments used during these tests.
d. Information regarding any alarms which monitor on-line performance.
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TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST
e. Copy of the document describing the inspection results of each heat exchanger.
The requested documents are to be for the time period from the onsite inspection
period back to the documents that were provided in response to the previous
heat sink performance inspection.
f. The cleaning and inspection maintenance schedule for each heat exchanger for
the next 5 years.
g. Copy of the design specification and heat exchanger data sheets for each heat
exchanger.
h. Copy of the vendor manuals including component drawings for each heat
exchanger.
i. Copy of the calculation which establishes the limiting (maximum) design basis
heat load which is required to be removed by each of these heat exchangers.
j. Copy of the operating procedures that ensure that the maximum cooling water
system inlet temperature limit is not exceeded.
k. Copy of the calculations or documents which evaluate the potential for water
hammer in each heat exchanger or associated piping.
l. Copy of the calculations that evaluate excessive tube vibration in each heat
exchanger and the documents that describe the controls that prevent heat
exchanger degradation due to excessive flow induced vibration during operation.
m. Copy of the periodic flow testing at or near maximum design flow. The requested
documents are to be for the time period from the onsite inspection period back to
the documents that were provided in response to the previous heat sink
performance inspection.
n. Copy of the document which identifies the current number of tubes in service for
each heat exchanger and the supporting calculation which establishes the
maximum number of tubes which can be plugged in each heat exchanger.
o. Copy of the document establishing the repair criteria (plugging limit) for degraded
tubes which are identified in each heat exchanger.
p. Copies of the documents that verify the structural integrity of the heat exchanger
(e.g. eddy current summary sheets, ultrasonic testing results, and visual
inspection results).
q. Copies of those documents that describe the methods taken to control water
chemistry in the heat exchangers.
2. For the review of the operation of the safety-related service water system (or
equivalent) and the UHS:
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TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST
a. Copies of any design change performed on the UHS. The requested documents
are to be for the time period from the onsite inspection period back to the
documents that were provided in response to the previous heat sink performance
inspection.
b. Copies of any design change performed on the safety-related service water
system. The requested documents are to be for the time period from the onsite
inspection period back to the documents that were provided in response to the
previous heat sink performance inspection.
c. Copies of procedures for a loss of UHS. Provide documentation that the
instrumentation, which is relied on for decision-making is available and
functional.
d. Copies of procedures for a loss of service water system. Provide copies of
procedures that include specific guidance for a loss of intake structure, loss of all
service water pumps, or pipe rupture, as applicable. Provide documentation that
Intake bay water level instrumentation used by emergency operating procedures
(EOPs) and Emergency Plan emergency action levels (EAL), during abnormal or
emergency conditions use that same locations for measuring the Technical
Specification UHS water level and the emergency plan EAL UHS water level is
effectively the same.
e. Provide documentation of inspections and maintenance done to prevent
macrofouling (e.g. silt, dead mussel shells, or debris) and biotic fouling (e.g. fish,
algae, grass, or kelp). Provide documentation of biocide treatments were
accomplished as scheduled, controlled, and the results were monitored, trended,
and evaluated. Provide documentation that the biocide treatment program is
consistent with industry standards. Provide documentation that treatment results
met licensee established acceptance criteria and maintained satisfactory biotic
control. Provide documentation that microbiological induced corrosion (MIC) was
monitored, trended, and controlled. The requested documents are to be for the
time period from the onsite inspection period back to the documents that were
provided in response to the previous heat sink performance inspection.
f. Copies of chemistry procedures that monitor service water intake for pH, calcium
hardness, etc. Also, provide copies of the associated results. Provide
documentation showing that calcium would not plate-out on hot heat exchanger
tubes during a design basis event. Provide documentation that common water
quality chemistry analysis of indicators, e.g., Langeliers Index were used to
reduce the likelihood of degrading the heat transfer coefficient due to calcium
deposits. The requested documents are to be for the time period from the onsite
inspection period back to the documents that were provided in response to the
previous heat sink performance inspection.
g. Copies of documents associated with the monitoring of pump performance for
potential strong-pump vs. weak-pump interaction that demonstrate the potential
does not exist or no adverse effects result from the interaction during routine
system operation, testing and following pump maintenance. Provide vendor
pump curves and pump curves developed during system testing. Provide Lasalle
Stations response to Bulletin 88-04. Provide Lasalles system hydraulic model,
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TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST
with assumptions on mini-flow, and case studies with parallel pumps operating in
the mini-flow mode.
3. For the review associated with the system walkdown of the safety-related service
water system:
a. Copies of the testing, inspection, or monitoring program procedures for buried or
inaccessible piping and documentation of the associated results and evaluations
including documentation of any licensee walkdowns (including pictures, notes,
etc.). Provide documentation with results demonstrating that piping inspections
and monitoring programs included periodic checks of riser penetrations (e.g., a
vertical pipe coming up through a cement floor or foundation) and also included
checks of inspection manways on large bore piping (e.g., where the manway
attaches to the pipe). The requested documents are to be for the time period
from the onsite inspection period back to the documents that were provided in
response to the previous heat sink performance inspection.
b. Copies of the ultrasonic test results and visual inspection results that verify the
structural integrity of the piping.
c. Copies of the procedures with results monitoring, assessing, and dispositioning
of active thru wall pipe leaks, including structural evaluations and/or planned
corrective actions.
d. Provide the history of any thru wall pipe leaks on the system. The requested
documents are to be for the time period from the onsite inspection period back to
the documents that were provided in response to the previous heat sink
performance inspection.
e. Copies of the documents associated with the periodic inspection program (and
results) used to detect protective coating failure, corrosion, and erosion.
f. Copies of the IST vibration monitoring results and operational history for deep
draft vertical pumps, if applicable. Provide Lasalles responses to Bulletin 79-15,
and Information Notices 80-07, 93-68, 94-45, and 07-05. The requested
documents are to be for the time period from the onsite inspection period back to
the documents that were provided in response to the previous heat sink
performance inspection.
If the information requested above will not be available, please contact Gerard ODwyer as soon
as possible at 630-829-9624 or e-mail Gerard.ODwyer@nrc.gov.
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