ML19065A298
| ML19065A298 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 03/05/2019 |
| From: | Lionel Rodriguez NRC/RGN-III/DRS/EB2 |
| To: | Bryan Hanson Exelon Generation Co, Exelon Nuclear |
| References | |
| IR 2019003 | |
| Download: ML19065A298 (9) | |
See also: IR 05000454/2019003
Text
March 5, 2019
Mr. Bryan C. Hanson
Senior VP, Exelon Generation Company, LLC
President and CNO, Exelon Nuclear
4300 Winfield Road
Warrenville, IL 60555
SUBJECT: BYRON STATION, UNITS 1 AND 2NOTIFICATION OF AN NRC
TRIENNIAL HEAT SINK PERFORMANCE INSPECTION AND REQUEST
FOR INFORMATION; INSPECTION REPORT 05000454/2019003 AND
Dear Mr. Hanson:
On July 8, 2019, the U.S. Nuclear Regulatory Commission (NRC) will begin the onsite portion of
the Triennial Heat Sink Performance Inspection at your Byron Station, Units 1 and 2. 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 two 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 April 29, 2019.
By May 3, 2019, 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 to the inspector no later than June 24, 2019. 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.
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.
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.
B. Hanson
-2-
The lead inspector for this inspection is Lionel Rodriguez. We understand that our licensing
contact for this inspection is Zoe Cox of your organization. If there are any questions about
the inspection or the material requested in the enclosure, please contact the lead inspector at
630-829-9609 or via e-mail at Lionel.Rodriguez@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.
This letter and its enclosure 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 10 CFR 2.390, Public Inspections, Exemptions, Requests for Withholding.
Sincerely,
/RA/
Lionel Rodriguez, Reactor Engineer
Engineering Branch 2
Division of Reactor Safety
Docket Nos. 50-454; 50-455
Enclosure:
Document Request for Triennial Heat Sink
Performance Inspection
cc: Distribution via LISTSERV
B. Hanson
-3-
Letter to Bryan C. Hanson from Lionel Rodriguez dated March 5, 2019.
SUBJECT: BYRON STATION, UNITS 1 AND 2NOTIFICATION OF AN NRC
TRIENNIAL HEAT SINK PERFORMANCE INSPECTION AND REQUEST
FOR INFORMATION; INSPECTION REPORT 05000454/2019003 AND
DISTRIBUTION:
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ADAMS Accession Number: ML19065A298
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DATE
03/05/19
OFFICIAL RECORD COPY
DOCUMENT REQUEST FOR TRIENNIAL HEAT SINK PERFORMANCE INSPECTION
Enclosure
Inspection Report: 05000454/2019003; 05000455/2019003
Inspection Dates:
July 8-12, 2019
Inspection Procedures:
71111.07, Heat Sink Performance
Lead Inspector:
630-829-9609
Lionel.Rodriguez@nrc.gov
Please provide the information electronically in pdf files, Excel, or other searchable formats,
preferably on some portable electronic media (e.g., CD-ROM, DVD). The portable electronic
media should contain descriptive names, and be indexed and hyperlinked to facilitate ease of
use. The information can also be provided via an internet file sharing system, so long as the
inspectors are provided access to the system throughout the inspection process and the system
allows the files to be downloaded. Information in lists should contain enough information to be
easily understood by someone who has knowledge of light water reactor technology.
I.
Information Requested By April 29, 2019
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 (CAP) documents (with a short description)
associated with GL 89-13 heat exchangers, heat sinks, silting, corrosion, fouling,
aging, heat exchanger testing, ultimate heat sink (UHS), and safety-related service
water systems for the previous 3 years or since the last CAP document list was sent
to the U.S. Nuclear Regulatory Commission for the previous Heat Sink Performance
Inspection. The list should include all CAP documents not on the last CAP document
list.
4. Copy of any self-assessment done on any of the GL 89-13 heat exchangers, UHS,
and safety-related service water systems since the last Heat Sink Performance
Inspection.
5. Last two System Health Report(s) and maintenance rule system notebooks for all the
GL 89-13 heat exchangers, UHS, and safety-related service water systems.
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.
DOCUMENT REQUEST FOR TRIENNIAL HEAT SINK PERFORMANCE INSPECTION
2
7. List of permanent and temporary modifications (with a short description) associated
with GL 89-13 heat exchangers, UHS, and safety-related service water systems.
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.
8. Electronic copies of the current Final Safety Analysis Report, Technical
Specifications, Technical Specifications Basis, and Technical Report Manual.
II.
Information Requested By June 24, 2019
1. Copies of the GL 89-13 responses.
2. Copies of procedures developed to implement the recommendations of GL 89-13
(e.g., the GL 89-13 Heat Exchanger Program description).
3. A schedule of all inspections, cleanings, maintenance, or testing of any
safety-related plant heat exchanger to be performed during the onsite portion of
the inspection.
4. For the specific heat exchangers selected:
a. Copy of system description and design basis document for the heat exchangers
(as applicable).
b. Copy of the design specification, heat exchanger data sheets, and vendor
documents including component drawings applicable for the selected heat
exchangers.
c. Copies of normal, abnormal, and emergency operating procedures associated
with the selected heat exchangers.
d. Copy of the operating procedure that ensures that the maximum cooling water
system inlet temperature limit is not exceeded.
e. Copies of the Aging Management Programs (AMP) and the implementing
procedures that manage aging of the selected heat exchangers (as applicable).
f. Information regarding any alarms which monitor on-line performance.
g. Copy of the document which identifies the current number of tubes in service for
each heat exchanger.
h. Provide a list of calculations (with a short description) which currently apply to
each heat exchanger.
i.
Provide the calculations or evaluations that:
i.
establish the limiting (maximum) design basis heat load required to be
removed by each of these heat exchangers;
DOCUMENT REQUEST FOR TRIENNIAL HEAT SINK PERFORMANCE INSPECTION
3
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.
establish the maximum number of tubes which can be plugged in each
heat exchanger;
v.
evaluate the potential for water hammer in each heat exchanger or
associated piping; and
vi.
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.
j.
Copies of the two most recent completed tests and evaluation data confirming
thermal performance for those heat exchangers which are performance tested.
Include 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.
k. 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.
l.
The thermal performance testing, cleaning, and inspection maintenance
schedule for each heat exchanger for the next 5 years.
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. Copies of those documents that describe the methods taken to control water
chemistry in the heat exchangers.
o. 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).
p. 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.
DOCUMENT REQUEST FOR TRIENNIAL HEAT SINK PERFORMANCE INSPECTION
4
5. For the UHS and the safety-related service water systems (or equivalent):
a. Copy of system description and design basis document (as applicable).
b. Copy of any operability determinations or other documentation of degradation
associated with the UHS and the safety-related service water systems.
c. Copy of the document (e.g., Updated Final Safety Analysis Report or Technical
Requirements Manual) that states the maximum cooling water system inlet
temperature limit that still allows full licensed power operation of the nuclear
reactor.
d. Copy of the construction code and design specification.
e. 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.
f. Copies of the AMPs and the implementing procedures that manage aging of the
UHS (including the intake structure) and the safety-related service water systems
(as applicable).
g. Copies of CAP documents associated with waterhammer or hydraulic transients
in the safety-related service water systems since the last Heat Sink Performance
Inspection.
h. If available, provide an electronic copy of piping and instrumentation diagrams for
the safety-related service water systems, including the intake structure.
i.
Provide a list of calculations (with a short description), which currently apply to
UHS and safety-related service water systems.
j.
Provide a list of instruments (with a short description) associated with automatic
or alarm functions for the UHS and safety-related service water systems.
k. Provide a list of any design change (with a short description) performed on the
UHS or safety-related service water systems since the last Heat Sink
Performance Inspection.
l.
For the UHS.
i.
Copies of calculations and surveillances that determine the UHS reservoir
capacity and heat transfer capability.
ii.
Copies of surveillance procedures and testing results performed on the
instrumentation relied upon to determine UHS reservoir capability. 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.
DOCUMENT REQUEST FOR TRIENNIAL HEAT SINK PERFORMANCE INSPECTION
5
iii.
Copies of documents associated with the periodic monitoring and
trending of sediment build-up.
iv.
Copies of the procedures used for verifying that adjacent non-seismic or
nonsafety-related structures cannot degrade or block safety-related flow
paths during severe weather or seismic events.
v.
Copies of procedures for the periodic performance monitoring of heat
transfer capacity and the associated results. 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.
vi.
Copies of the inspection procedures for the verification of the
structural integrity of the UHS and the associated results. 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.
vii.
Copy of the calculation associated with the structural integrity of 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.
viii.
Copies of any credited AMP monitoring/inspection results for the UHS
(as applicable). The requested documents are to be for any completed
monitoring/inspection in the time period from the onsite inspection period
back to the documents that were provided in response to the previous
Heat Sink Performance Inspection.
m. For the review of the performance testing of the safety-related service water
system (or equivalent) and the UHS:
i.
Copies of the last two performance tests, such as the American Society
of Mechanical Engineers in-service test, for the pumps, valves, and, if
applicable, the cooling tower fans in the safety-related service water
system. If the components are not performance tested, please provide
documentation verifying performance by the methods actually used.
ii.
Copies of the documents that demonstrate that flow balance testing was
performed during the last three years. If the last flow test was performed
longer than three years, then provide the last flow test.
iii.
Copies of the documents that demonstrate that flow balance testing will
continue to be periodically done in the future.
DOCUMENT REQUEST FOR TRIENNIAL HEAT SINK PERFORMANCE INSPECTION
6
iv.
Copies of procedures used to monitor interface valves between
the safety-related section of the service water system and the
nonsafety-related section and the associated results. 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.
v.
Copies of the procedures that verify the performance of risk significant
non-safety functions and the associated results. 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 by the dates specified, please contact
Lionel Rodriguez as soon as possible at 630-829-9609 or e-mail Lionel.Rodriguez@nrc.gov.