ML22116A127
| ML22116A127 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 04/26/2022 |
| From: | Sanchez-Santiago E NRC/RGN-III/DRS/EB2 |
| To: | Rhodes D Constellation Energy Generation |
| References | |
| IR 2022002 | |
| Download: ML22116A127 (11) | |
See also: IR 05000454/2022002
Text
Mr. David Rhoades
Senior Vice President
Constellation Energy Generation, LLC
President and Chief Nuclear Officer (CNO)
Constellation Nuclear
4300 Winfield Road
Warrenville, IL 60555
SUBJECT:
BYRON STATION UNIT 1 AND UNIT 2 - REQUEST FOR INFORMATION
FOR AN NRC TRIENNIAL HEAT EXCHANGER/SINK PERFORMANCE
INSPECTION AND REQUEST FOR INFORMATION; INSPECTION
REPORT 05000454/2022002; 05000455/2022002
Dear Mr. Rhoades:
On June 13, 2022, the U.S. Nuclear Regulatory Commission (NRC) will begin the onsite portion
of the Triennial Heat Exchanger/Sink Performance Inspection at Byron Station. This inspection
will be performed in accordance with NRC baseline Inspection Procedure 71111.07.
The Triennial Heat Exchanger/Sink Performance Inspection focuses on service water cooled
heat exchangers, closed loop heat exchangers and the ultimate heat sink (UHS). The
inspection verifies that the selected service water cooled heat exchanger(s), closed loop heat
exchanger(s) and the UHS remain capable of performing their intended safety functions.
The inspection includes 1 week onsite. The inspection team will consist of three NRC
inspectors. The current inspection schedule is as follows:
Preparation week:
June 6 - 10, 2022
Onsite week:
June 13 - 17, 2022
In order to minimize the impact that the inspection has on the site and to ensure a productive
inspection, a request for documents needed for the inspection is enclosed. The information
request has been divided into three groups:
The first group lists information necessary for the initial inspection scoping activities.
This information should be available to the lead inspector no later than May 16,
2022. The lead inspector will communicate the initial selected set of approximately
2-3 risk significant heat exchangers by May 17, 2022.
The second group is needed to support the 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 June 6, 2022.
This information should be separated for each selected component, especially if
provided electronically (e.g., folder with component name that includes calculations,
April 26, 2022
D. Rhoades
- 2 -
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 also be available to the inspector on
June 6, 2022. 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.
The lead inspector for this inspection is Elba Sanchez Santiago. 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 630-829-9520 or via e-mail at elba.sanchezsantiago@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.
D. Rhoades
- 3 -
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 Website at http://www.nrc.gov/reading-rm/adams.html (the Public Electronic
Reading Room).
Sincerely,
Elba Sanchez Santiago, Senior Reactor Inspector
Engineering Branch 2
Division of Reactor Safety
Docket Nos. 50-454 and 50-455
License Nos. NPF-37 and NPF-66
Enclosure:
Triennial Heat Sink Performance Inspection
Document Request
cc: Distribution via LISTSERV
Signed by Sanchez Santiago, Elba
on 04/26/22
D. Rhoades
- 4 -
Letter to David Rhoades from Elba Sanchez Santiago dated April 26, 2022.
SUBJECT:
BYRON STATION UNITS 1 AND 1 - REQUEST FOR INFORMATION FOR
AN NRC TRIENNIAL HEAT EXCHANGER/SINK PERFORMANCE
INSPECTION AND REQUEST FOR INFORMATION; INSPECTION
REPORT 05000454/2022002; 05000455/2022002
DISTRIBUTION:
RidsNrrDorlLpl3
RidsNrrPMByron Resource
RidsNrrDroIrib Resource
DRPIII
DRSIII
ADAMS Accession Number: ML22116A127
Publicly Available
Non-Publicly Available
Sensitive
Non-Sensitive
OFFICE
RIII
NAME
ESanchezSantiago:
mb
DATE
04/26/2022
OFFICIAL RECORD COPY
TRIENNIAL HEAT EXCHANGER/SINK PERFORMANCE DOCUMENT REQUEST
Enclosure
HEAT EXCHANGER/SINK PERFORMANCE
REQUEST FOR INFORMATION
I.
ADMINISTRATIVE INSPECTION INFORMATION
Inspection Report Number: 05000454/2022002; 05000455/2022002
Onsite Inspection Dates:
June 13 - 17, 2022
Inspection Procedure:
IP 71111.07, HEAT EXCHANGER/SINK PERFORMANCE
Lead Inspector:
Elba Sanchez Santiago, Senior Reactor Inspector, DRS
630-829-9520
Elba.sanchezsantiago@nrc.gov
Teammates:
Megan Gangewere, Reactor Inspector, RIII/DRS
Muzammil Siddiqui, Reactor Inspector, RIII/DRS
I.
Information Requested by: May 16, 2022
1.
List of the Generic Letter (GL) 89-13, Service Water System Problems Affecting
Safety-Related Equipment, heat exchangers in order of risk significance.
a.
Identify if the heat exchanger is service water cooled or a closed loop heat
exchanger.
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 3 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.
TRIENNIAL HEAT EXCHANGER/SINK PERFORMANCE DOCUMENT REQUEST
2
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.
8.
Provide a list of all corrective action documents, with a short description, associated with
the UHS for the previous three years or since the last corrective action program
document list was sent to the NRC for the previous Triennial Heat Sink Performance
Inspection.
II.
Information Requested by: June 6, 2022
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.
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.
TRIENNIAL HEAT EXCHANGER/SINK PERFORMANCE DOCUMENT REQUEST
3
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):
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.
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 including procedures for loss of this systems.
h.
Provide a list of calculations (with a short description), which currently apply to
UHS.
i.
Provide a list of instruments (with a short description) associated with automatic
or alarm functions for the UHS.
j.
Provide a list of any design change (with a short description) performed on the
UHS 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 by: May 6, 2022
1.
For the specific service water cooled 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.
TRIENNIAL HEAT EXCHANGER/SINK PERFORMANCE DOCUMENT REQUEST
4
c.
Documentation and procedures that identify the types, accuracy, and location of
any 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.
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).
TRIENNIAL HEAT EXCHANGER/SINK PERFORMANCE DOCUMENT REQUEST
5
2.
For the specific closed loop heat exchangers selected:
a.
Copy of the design specification and heat exchanger data sheets for each heat
exchanger.
b.
Copy of the vendor manuals including component drawings for each heat
exchanger.
c.
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.
d.
Copy of the operating procedures that ensure that the maximum cooling water
system inlet temperature limit is not exceeded.
e.
Copy of the calculations or documents which evaluate the potential for water
hammer in each heat exchanger or associated piping.
f.
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.
g.
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.
h.
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.
i.
Copy of the document establishing the repair criteria (plugging limit) for degraded
tubes which are identified in each heat exchanger.
j.
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).
k.
Copies of those documents that describe the methods taken to control water
chemistry in the heat exchangers.
3.
For review of the operation of the service water system and UHS:
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.
TRIENNIAL HEAT EXCHANGER/SINK PERFORMANCE DOCUMENT REQUEST
6
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.
e.
Inspections and/or maintenance related to preventing macrofouling (e.g., silt,
dead mussel shells, or debris) and biotic fouling (e.g., fish, algae, grass, or kelp).
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 for pH, calcium hardness, etc. Also,
provide copies of 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.
g.
Copies of documents associated with the monitoring of pump performance for
potential strong-pump vs. weak-pump interaction.
4.
For the review associated with the system walkdown of the selected service water
and/or closed cooling water systems:
a.
Copies of the testing, inspection, or monitoring program procedures for buried or
inaccessible piping 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.
b.
Copies of the ultrasonic test results and/or visual inspections that verify the
structural integrity of the piping.
c.
Copies of the procedures to monitor, assess, and disposition active thru wall pipe
leaks, including structural evaluations and/or planned corrective actions.
d.
History of any thru wall pipe leak 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 used to
detect protective coating failure, corrosion, and erosion.
f.
Copies of the in-service testing (IST) vibration monitoring results and operational
history for deep draft vertical pumps, if applicable. 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 surveillance procedures and testing results performed on the service
water pump bay water level instruments. 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.
TRIENNIAL HEAT EXCHANGER/SINK PERFORMANCE DOCUMENT REQUEST
7
h.
Copies of procedures associated with operating during adverse weather
conditions (e.g., icing, high temperatures, or low level).
i.
Copy of the evaluation for the potential effects of low flow/level on underwater
weir walls intended to limit silt or sand intake, if applicable.
If the information requested above will not be available, please contact Elba Sanchez Santiago
as soon as possible at 630-829-9520 or via e-mail at elba.sanchezsantiago@nrc.gov.