ML17102A744

Notification of an NRC Triennial Heat Sink Performance Inspection and Request for Information; Inspection Report 05000461/2017003 (Lnr)

ML17102A744
Person / Time
Site:	Clinton
Issue date:	04/12/2017
From:	Lionel Rodriguez NRC/RGN-III/DRS/EB2
To:	Bryan Hanson Exelon Generation Co, Exelon Nuclear
References
IR 2017003
Download: ML17102A744 (8)

See also: IR 05000461/2017003

Text

UNITED STATES

NUCLEAR REGULATORY COMMISSION

REGION III

2443 WARRENVILLE RD. SUITE 210

LISLE, IL 60532-4352

April 12, 2017

Mr. Bryan C. Hanson

Senior VP, Exelon Generation Company, LLC

President and CNO, Exelon Nuclear

4300 Winfield Road

Warrenville, IL 60555

SUBJECT: CLINTON POWER STATION - NOTIFICATION OF AN NRC TRIENNIAL HEAT

SINK PERFORMANCE INSPECTION AND REQUEST FOR INFORMATION;

INSPECTION REPORT 05000461/2017003

Dear Mr. Hanson:

On July 17, 2017, the U.S. Nuclear Regulatory Commission (NRC) will begin the onsite portion

of the Triennial Heat Sink Performance Inspection at your Clinton Power Station. 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 June 5, 2017. By June

9, 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 July 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

July 17, 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.

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 Kenneth Pointer 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 No. 50-461

License No. NPF-62

Enclosure:

Triennial Heat Sink Performance

Inspection Document Request

cc: Distribution via LISTSERV

B. Hanson -3-

Letter to Bryan C. Hanson from Lionel Rodriguez dated April 12, 2017

SUBJECT: CLINTON POWER STATION - NOTIFICATION OF AN NRC TRIENNIAL HEAT

SINK PERFORMANCE INSPECTION AND REQUEST FOR INFORMATION;

INSPECTION REPORT 05000461/2017003

DISTRIBUTION:

Jeremy Bowen

RidsNrrDorlLpl3

RidsNrrPMClinton Resource

RidsNrrDirsIrib Resource

Cynthia Pederson

Darrell Roberts

Richard Skokowski

Allan Barker

Carole Ariano

Linda Linn

DRSIII

DRPIII

ADAMS Accession Number ML17102A744

OFFICE RIII RIII RIII RIII

NAME LRodriguez:cl

DATE 04/12/17

OFFICIAL RECORD COPY

TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST

Inspection Report: 05000461/2017003

Inspection Dates: July 17-21, 2017

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. 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 June 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 water systems for the previous three 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 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.

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, Technical

Specifications, Technical Specifications Basis, and Technical Report Manual.

II Information Requested By July 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 description and design basis document 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.

5. For the UHS and the safety-related service water systems (or equivalent):

a. Copy of system description and design basis document (as applicable).

b. Copy of any operability determinations or other documentation of degradation

associated with the UHS and the safety-related service water systems.

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TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST

c. Copy of the document (e.g., Updated Final Safety Analysis Report 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 water 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 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.

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 to be Available on First Day of Inspection, July 17, 2017

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.

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TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST

e. The cleaning and inspection maintenance schedule for each heat exchanger for

the next 5 years.

f. 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.

g. Copy of the operating procedure that ensures that the maximum cooling water

system inlet temperature limit is not exceeded.

h. Copy of the calculations or documents which evaluate the potential for water

hammer in each heat exchanger or associated piping.

i. 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.

j. 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.

k. 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.

l. Copy of the document establishing the repair criteria (plugging limit) for degraded

tubes which are identified in each heat exchanger.

m. 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).

n. Copies of those documents that describe the methods taken to control water

chemistry in the heat exchangers.

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.

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TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST

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 of the operation of the safety-related service water systems (or

equivalent) and the 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.

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.

If the information requested above will not be available, please contact Lionel Rodriguez as

soon as possible at 630-829-9609 or e-mail Lionel.Rodriguez@nrc.gov.

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