ML19351C771
| ML19351C771 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 12/16/2019 |
| From: | Lionel Rodriguez NRC/RGN-III |
| To: | Bryan Hanson Exelon Generation Co |
| References | |
| IR 2020001 | |
| Download: ML19351C771 (8) | |
See also: IR 05000237/2020001
Text
B. Hanson
UNITED STATES
NUCLEAR REGULATORY COMMISSION
REGION III
2443 WARRENVILLE RD. SUITE 210
LISLE, ILLINOIS 60532-4352
December 16, 2019
Mr. Bryan C. Hanson
Senior VP, Exelon Generation Co., LLC
President and CNO, Exelon Nuclear
4300 Winfield Road
Warrenville, IL 60555
SUBJECT: DRESDEN NUCLEAR POWER STATION, UNITS 2 AND 3 - NOTIFICATION
OF AN NRC TRIENNIAL HEAT SINK PERFORMANCE INSPECTION AND
REQUEST FOR INFORMATION; INSPECTION REPORT 05000237/2020001
AND 05000249/2020001
Dear Mr. Hanson:
On February 10, 2020, the U.S. Nuclear Regulatory Commission (NRC) will begin the onsite
portion of the Triennial Heat Sink Performance inspection at your Dresden Nuclear Power
Station, Units 2 and 3. 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 January 8, 2020. By
January 10, 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 to the inspector no later than February 3, 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.
It is also requested that corrective action documents and/or responses 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 Dean Walker 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. 05000237 and 05000249
License Nos. DPR-19 and DPR-25
Enclosure:
Triennial Heat Sink Performance Inspection
Document Request
cc: Distribution via LISTSERV
B. Hanson -3-
Letter to Bryan Hanson from Lionel Rodriguez dated December 16, 2019.
SUBJECT: DRESDEN NUCLEAR POWER STATION, UNITS 2 AND 3 - NOTIFICATION
OF AN NRC TRIENNIAL HEAT SINK PERFORMANCE INSPECTION AND
REQUEST FOR INFORMATION; INSPECTION REPORT 05000237/2020001
AND 05000249/2020001
DISTRIBUTION:
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ADAMS Accession Number: ML19351C771
OFFICE RIII N RIII RIII RIII
NAME LRodriguez:tc
DATE 12/16/2019
OFFICIAL RECORD COPY
Inspection Report: 05000237/2020001 and 05000249/2020001
Inspection Dates: February 10-14, 2020
Inspection Procedure: IP 71111.07, Heat Sink Performance
Lead Inspector: Lionel Rodriguez
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 January 8, 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 (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 three years or since the last CAP 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 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.
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.
Enclosure
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 (FSAR), Technical
Specifications, Technical Specifications Basis, and Technical Report Manual.
II. Information Requested by February 3, 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. 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.
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;
ii. demonstrate the heat exchangers capacity to remove the limiting heat
load;
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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. 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. The thermal performance testing, cleaning, and inspection maintenance
schedule for each heat exchanger for the next 5 years.
n. 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.
o. Copies of those documents that describe the methods taken to control water
chemistry in the heat exchangers.
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.
5. For the ultimate heat sink (UHS) and the safety-related service water systems (or
equivalent):
a. Copy of system description and design basis document (as applicable).
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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. 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.
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
(P&IDs) 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 review of the UHS:
i. Copies of calculations and surveillances that determine the UHS reservoir
capacity and heat transfer capability.
ii. Copies of the toe of the weir or embankment inspection procedures 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.
iii. Copies of the inspection procedures of the rip rap protection placed on
excavated side slopes 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.
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iv. 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.
v. 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.
vi. 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.
m. For the review associated with the system walkdown of the service water system:
i. 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.
ii. Copies of the ultrasonic test results and/or visual inspections that verify
the structural integrity of the piping.
iii. Copies of the procedures to monitor, assess, and disposition active thru
wall pipe leaks, including structural evaluations and/or planned corrective
actions.
iv. 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.
v. Copies of the documents associated with the periodic inspection program
used to detect protective coating failure, corrosion, and erosion.
vi. Copies of the 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.
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.
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