ML17230A273
| ML17230A273 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 08/18/2017 |
| From: | O'Dwyer G Division of Reactor Safety III |
| To: | Bryan Hanson Exelon Generation Co |
| References | |
| IR 2017004 | |
| Download: ML17230A273 (9) | |
See also: IR 05000237/2017004
Text
UNITED STATES
NUCLEAR REGULATORY COMMISSION
REGION III
2443 WARRENVILLE RD. SUITE 210
LISLE, IL 60532-4352
August 18, 2017
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 3NOTIFICATION
OF AN NRC TRIENNIAL HEAT SINK PERFORMANCE INSPECTION AND
REQUEST FOR INFORMATION; INSPECTION REPORT 05000237/2017004;
Dear Mr. Hanson:
On October 16, 2017, 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 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 5, 2017. By September 12, 2017, 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 October 3, 2017. 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 onsite to the inspector on
October 16, 2017. 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.
B. Hanson -2-
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 Mr. Gerard ODwyer. We understand that our licensing
contact for this inspection is Mr. Dean J. 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 630-829-9624 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.
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/
Gerard ODwyer, Reactor Inspector
Engineering Branch 2
Division of Reactor Safety
Docket Nos. 50-237; 50-249
Enclosure:
Triennial Heat Sink Performance Inspection
Document Request
cc: Distribution via LISTSERV
B. Hanson -3-
Letter to Bryan C. Hanson from Gerard ODwyer dated August 18, 2017
SUBJECT: DRESDEN NUCLEAR POWER STATION, UNITS 2 AND 3NOTIFICATION
OF AN NRC TRIENNIAL HEAT SINK PERFORMANCE INSPECTION AND
REQUEST FOR INFORMATION; INSPECTION REPORT 05000237/2017004;
DISTRIBUTION:
RidsNrrDorlLpl3
RidsNrrPMDresden Resource
RidsNrrDirsIrib Resource
Cynthia Pederson
DRPIII
DRSIII
ROPreports.Resource@nrc.gov
ADAMS Accession Number ML17230A273
OFFICE RIII RIII RIII RIII
NAME GODwyer:cl
DATE 08/18/17
OFFICIAL RECORD COPY
TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST
Inspection Report: 05000237/2017004; 05000249/2017004
Inspection Dates: October 16 - 20, 2017
Inspection Procedure: IP 71111.07, Heat Sink Performance
Lead Inspector: Gerard ODwyer
630-829-9624
Gerard.ODwyer@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 5, 2017:
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, or heat exchanger testing, ultimate heat sink (UHS), and safety-related
service and closed cooling 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 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 and closed cooling
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.
Enclosure
TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST
8. Electronic copies of the current Final Safety Analysis Report (FSAR), Technical
Specifications, Technical Specifications Basis, and Technical Report Manual.
9. List of enhancements and/or commitments made during license renewal for
GL 89-13 heat exchangers, UHS, and safety-related service water systems
(as applicable).
II. Information Requested By October 3, 2017:
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 CAP documents.
4. For the specific heat exchangers selected:
a. Copy of system descriptions and applicable Updated FSAR sections for the heat
exchangers (as applicable).
b. Provide a list of calculations (with a short description) which currently apply to
each heat exchanger.
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
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 design specification, heat exchanger data sheets, and vendor
documents including component drawings applicable for the selected heat
exchangers.
f. Copies of normal, abnormal, and emergency operating procedures associated
with the selected heat exchangers.
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TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST
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 UHS and the safety-related service water systems (or equivalent):
a. Copy of system description and applicable Updated FSAR sections
(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 FSAR 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 system description and design basis document (as applicable).
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 systems including procedures for loss of
these systems.
g. Copies of CAP documents associated with waterhammer or hydraulic transients
in the safety-related service water systems since the last Heat Sink Inspection.
h. If available, provide an electronic copy of piping and instrumentation diagrams for
the service water systems, including the intake structure.
i. Provide a list of calculations (with a short description), which currently apply to
the 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 and safety-related service water systems 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 (as
applicable).
6. 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.
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TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST
III. Information Requested to be Available on First Day of Inspection,
October 16, 2017:
1. For the specific 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.
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 calculation which establishes the limiting (maximum) design basis
heat load which is required to be removed by each of these heat exchangers.
h. Copy of the operating procedure that ensures that the maximum cooling water
system inlet temperature limit is not exceeded.
i. Copy of the calculations or documents which evaluate the potential for water
hammer in each heat exchanger or associated piping.
j. 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.
k. 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.
l. 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.
m. Copy of the document establishing the repair criteria (plugging limit) for degraded
tubes which are identified in each heat exchanger.
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TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST
n. 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).
o. 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).
p. 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 review of the operation of the safety-related service water systems and the
UHS:
a. Copies of any design changes 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
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.
c. Copies of procedures for a loss of UHS.
d. Copies of procedures for a loss of service water systems.
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 documents associated with the monitoring of pump performance for
potential strong-pump vs. weak-pump interaction.
3. For the review associated with the system walkdown of the service water intake
structure:
a. Copies of documentation that demonstrates proper functioning of the traveling
screens and strainers including backwash strainer function, (e.g., copies of the
last two inspections and surveillances associated with service water strainers,
traveling screens and trash racks).
b. List of preventive maintenance, including frequency, associated with service
water strainers, traveling screens and trash racks
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TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST
c. Copies of abnormal procedures for the traveling screens and service water
strainers.
d. 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.
e. Copies of the documents associated with the monitoring, trending, and
remediation of silt accumulation at the service water pump bay.
f. 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.
g. Copies of procedures associated with operating during adverse weather
conditions (e.g., icing especially frazil icing, high temperatures, or low level).
h. 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.
i. 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 Gerard ODwyer as soon
as possible at 630-829-9624 or e-mail Gerard.ODwyer@nrc.gov.
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