ML20238B869
| ML20238B869 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  (NPF-072, NPF-077) |
| Issue date: | 08/25/2020 |
| From: | Vance Petrella NRC/RGN-III/DRS/EB2 |
| To: | Bryan Hanson Exelon Nuclear |
| References | |
| IR 2020004 | |
| Download: ML20238B869 (9) | |
See also: IR 05000456/2020004
Text
August 25, 2020
Mr. Bryan C. Hanson
Senior VP, Exelon Generation Company, LLC
President and CNO, Exelon Nuclear
4300 Winfield Road
Warrenville, IL 60555
SUBJECT:
BRAIDWOOD STATION, UNITS 1 AND 2 - NOTIFICATION OF AN NRC
TRIENNIAL HEAT SINK PERFORMANCE INSPECTION AND REQUEST FOR
INFORMATION; INSPECTION REPORT 05000456/2020004;
Dear Mr. Hanson:
On November 16, 2020, the U.S. Nuclear Regulatory Commission (NRC) will begin the onsite
portion of the Triennial Heat Sink Performance Inspection at your Braidwood Station Units 1 and
2 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 September 21, 2020. By
October 2, 2020, 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 November 2, 2020. 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 at the Regional Office no later than
November 9, 2020. 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
B. Hanson
- 2 -
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 Vance Petrella. We understand that our licensing
contact for this inspection is James Mark of your organization. If there are any questions about
the inspection or the material requested in the enclosure, please contact the lead inspector at
630-829-9847 or via e-mail at Vance.Petrella@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/
Vance Petrella, Reactor Engineer
Engineering Branch 2
Division of Reactor Safety
Docket Nos. 50-456; 50-457
Enclosure:
Triennial Heat Sink Performance Inspection
Document Request
cc: Distribution via LISTSERV
B. Hanson
- 3 -
Letter to Bryan C. Hanson from Vance Petrella dated August 25, 2020.
SUBJECT:
BRAIDWOOD STATION, UNITS 1 AND 2 - NOTIFICATION OF AN NRC
TRIENNIAL HEAT SINK PERFORMANCE INSPECTION AND REQUEST FOR
INFORMATION; INSPECTION REPORT 05000456/2020004;
DISTRIBUTION:
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RidsNrrPMBraidwood Resource
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Kenneth OBrien
DRPIII
DRSIII
ADAMS Accession Number: ML20238B869
Publicly Available
Non-Publicly Available
Sensitive
Non-Sensitive
OFFICE
RIII
NAME
VPetrella:mb
via e-mail
DATE
08/25/2020
OFFICIAL RECORD COPY
TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST
Enclosure
Inspection Report: 05000456/2020004; 05000457/2020004
Inspection Dates:
November 16 - 20, 2020
Inspection Procedure:
IP 71111.07, Heat Sink Performance
Lead Inspector:
630-829-9847
Vance.Petrella@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. 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 September 21, 2020
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, Ultimate
Heat Sink (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.
TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST
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, Technical Report Manual, and
Technical Report Manual Basis.
9.
List of enhancements and/or commitments made during license renewal for
GL 89-13 heat exchangers, UHS, and safety-related service and closed cooling
water systems (as applicable).
10.
Electronic copies of the current Probability Risk Assessment (PRA) Summary Note
Books.
11.
Provide an electronic copy of piping and instrumentation diagrams (P&IDs) for the
safety-related service water system, including the intake structure.
II.
Information Requested by November 2, 2020
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.
Copies of the selected corrective action program documents.
4.
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 the calculations or evaluations that:
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
TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST
3
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.
g. Copies of the Aging Management Programs (AMP) and the implementing
procedures that manage aging of the selected heat exchangers (as applicable).
5.
For the ultimate heat sink (UHS) and the safety-related service water system (or
equivalent):
a. Copies of the applicable Updated Final Safety Analysis Report (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.
d. Copy of the document (e.g. UFSAR 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.
e. Copy of the construction code and design specification.
f. 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.
g. Copies of corrective action documents associated with water hammer or
hydraulic transients in the service water system since the last Heat Sink
Inspection.
h. If available, provide electronic copies of the structural drawings of the intake
structure and Ultimate Heat Sink.
i.
Provide a list of calculations (with a short description), which currently apply to
UHS and safety-related service water system.
j.
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.
TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST
4
k. 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.
l.
Copies of the AMPs and the implementing procedures that manage aging of the
UHS (including the intake structure) and the safety-related service and closed
cooling water systems (as applicable).
6.
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 by November 9, 2020
1.
For the specific heat exchangers selected:
a. Copies of the two most recent completed tests and evaluation data confirming
thermal performance for those heat exchangers which are performance tested.
b. 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.
c. Information regarding any alarms which monitor on-line performance.
d. 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.
e. The cleaning and inspection maintenance schedule for each heat exchanger for
the next 5 years.
f. Copy of the operating procedure that ensures that the maximum cooling water
system inlet temperature limit is not exceeded.
g. Copy of the calculations or documents which evaluate the potential for water
hammer in each heat exchanger or associated piping.
h. The documents that describe the controls that prevent heat exchanger
degradation due to excessive flow induced vibration during operation.
i.
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.
TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST
5
j.
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.
k. Copy of the document establishing the repair criteria (plugging limit) for degraded
tubes which are identified in each heat exchanger.
l.
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).
m. Copies of those documents that describe the methods taken to control water
chemistry in the heat exchangers.
n. Copies of those documents that describe the methods taken to control water
chemistry in the heat exchangers, including those credited by any AMPs (as
applicable).
o. Copies of any credited AMP monitoring/inspection results for the selected heat
exchangers (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.
2.
For the UHS:
a. Copies of the inspection procedures for the verification of the structural integrity
of underwater 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.
b. Copies of the maintenance and/or inspection procedures for underwater UHS
sediment intrusion and the associated results including underwater diving
inspections and/or sediment removal activities. 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 calculations and surveillances that determine the UHS reservoir
capacity and heat transfer capability.
d. 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.
3.
For the review associated with the system walkdown of the service water intake
structure:
a. Copies of corrective maintenance for the last 6 years associated with service
water strainers, traveling screens and trash racks.
TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST
6
b. Copies of the last two inspections and/or surveillances associated with service
water strainers, traveling screens and trash racks.
c. List of preventive maintenance, including frequency, associated with service
water strainers, traveling screens and trash racks.
d. Copies of abnormal procedures for the traveling screens and service water
strainers.
e. Copies of the last two inspections and/or surveillances documenting that
component mounts have not excessively degraded (i.e., due to corrosion). For
example, inspections for the mounts for the, Service water pumps, service water
strainers, traveling screens and trash racks.
f. Copies of the documents associated with the monitoring, trending, and
remediation of silt accumulation at the service water pump bay.
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.
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.
j.
Copies of any credited AMP monitoring/inspection results for the safety-related
service and closed cooling water systems, and 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.
If the information requested above will not be available, please contact Vance Petrella as soon
as possible at 630-829-9847 or e-mail Vance.Petrella@nrc.gov.