ML21363A054
| ML21363A054 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 12/29/2021 |
| From: | O'Dwyer G NRC/RGN-III/DRS/EB2 |
| To: | Domingos C Northern States Power Company, Minnesota |
| References | |
| IR 2022002 | |
| Download: ML21363A054 (10) | |
See also: IR 05000282/2022002
Text
December 29, 2021
Mr. Christopher P. Domingos
Site Vice President
Prairie Island Nuclear Generating Plant
Northern States Power Company, Minnesota
1717 Wakonade Drive East
Welch, MN 55089-9642
SUBJECT: PRAIRIE ISLAND NUCLEAR GENERATING PLANT - REQUEST FOR
INFORMATION FOR AN NRC TRIENNIAL HEAT EXCHANGER/SINK
PERFORMANCE INSPECTION AND REQUEST FOR INFORMATION;
INSPECTION REPORT 05000282/2022002; 05000306/2022002
Dear Mr. Domingos:
On April 25, 2022, the U.S. Nuclear Regulatory Commission (NRC) will begin the onsite portion
of the Triennial Heat Exchanger/Sink Performance Inspection at Prairie Island Nuclear
Generating 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 one week onsite. The inspection team will consist of two NRC
inspectors. The current inspection schedule is as follows:
Preparation week: April 18 - 22, 2022
Onsite week: April 25 - 29, 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 February 3,
2022. The lead inspector will communicate the initial selected set of approximately
2-3 risk significant heat exchangers by March 4, 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 April 4, 2022.
This information should be separated for each selected component, especially if
provided electronically (e.g., folder with component name that includes calculations,
C. Domingos -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 be available to the inspector on April 11,
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 Gerard ODwyer. We understand that our licensing
contact for this inspection is Carrie Seipp 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.
C. Domingos -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 Web site at http://www.nrc.gov/reading-rm/adams.html (the Public Electronic
Reading Room).
Sincerely,
Sanchez Santiago, Elba signing on behalf
of O©Dwyer, Gerard
on 12/29/21
Gerard ODwyer, Reactor Inspector
Engineering Branch 2
Division of Reactor Safety
Docket Nos. 50-282 and 50-306
License Nos. DPR-42 and DPR-60
Enclosure:
Triennial Heat Sink Performance Inspection
Document Request
cc: Distribution via LISTSERV
C. Domingos -4-
Letter to Christopher P. Domingos from Gerard ODwyer dated December 29, 2021.
SUBJECT: PRAIRIE ISLAND NUCLEAR GENERATING STATION - REQUEST FOR
INFORMATION FOR AN NRC TRIENNIAL HEAT EXCHANGER/SINK
PERFORMANCE INSPECTION AND REQUEST FOR INFORMATION;
INSPECTION REPORT 05000282/2022002; 05000306/2022002
DISTRIBUTION:
RidsNrrPMPrairieIsland Resource
RidsNrrDorlLpl3
RidsNrrDroIrib Resource
DRPIII
DRSIII
ADAMS Accession Number: ML21363A054
Publicly Available Non-Publicly Available Sensitive Non-Sensitive
OFFICE RIII
NAME ESanchez Santiago
for GODwyer:mb
DATE 12/29/2021
OFFICIAL RECORD COPY
TRIENNIAL HEAT EXCHANGER/SINK PERFORMANCE DOCUMENT REQUEST
HEAT EXCHANGER/SINK PERFORMANCE
REQUEST FOR INFORMATION
I. ADMINISTRATIVE INSPECTION INFORMATION
Inspection Report Number: 05000282/2022002; 05000306/2022002
Onsite Inspection Dates: April 25 - 29, 2022
Inspection Procedure: IP 71111.07, HEAT EXCHANGER/SINK PERFORMANCE
Gerard ODwyer, Reactor Inspector, DRS
Lead Inspector: 630-829-9624
Gerard.Odwyer@nrc.gov
Teammates: TBD
II. Information Requested By: February 3, 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.
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.
Enclosure
TRIENNIAL HEAT EXCHANGER/SINK PERFORMANCE DOCUMENT REQUEST
8. Provide a list of all corrective action documents, with a short description, associated with
the UHS for the previous 3 years or since the last corrective action program document
list was sent to the NRC for the previous Triennial Heat Sink Performance Inspection.
III. Information Requested By: April 4, 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.
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.
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TRIENNIAL HEAT EXCHANGER/SINK PERFORMANCE DOCUMENT REQUEST
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 onsite portion of the inspection.
IV. Information Requested to Be Available for Inspection Preparation By: April 11, 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.
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 EXCHANGER/SINK PERFORMANCE 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).
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.
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TRIENNIAL HEAT EXCHANGER/SINK PERFORMANCE DOCUMENT REQUEST
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 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.
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TRIENNIAL HEAT EXCHANGER/SINK PERFORMANCE DOCUMENT REQUEST
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.
4. For review of the UHS Containment Device or Dam:
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.
If the information requested above will not be available, please contact Gerard ODwyer as soon
as possible at 630-829-9624 or via e-mail at Gerard.Odwyer@nrc.gov.
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