ML18082B381

Notification of an NRC Triennial Heat Sink Performance Inspection and Request for Information; Inspection Report 05000373/2018002; 05000374/2018002 (DRS-V.Petrella)

ML18082B381
Person / Time
Site:	LaSalle
Issue date:	03/23/2018
From:	Vance Petrella NRC/RGN-III
To:	Bryan Hanson Exelon Generation Co, Exelon Nuclear
References
IR 2018002
Download: ML18082B381 (9)

See also: IR 05000373/2018002

Text

UNITED STATES

NUCLEAR REGULATORY COMMISSION

REGION III

2443 WARRENVILLE RD. SUITE 210

LISLE, ILLINOIS 60532-4352

March 23, 2018

Mr. Bryan C. Hanson

Senior VP, Exelon Generation Company, LLC

President and CNO, Exelon Nuclear

4300 Winfield Road

Warrenville, IL 60555

SUBJECT: LASALLE COUNTY STATION, UNITS 1 AND 2NOTIFICATION OF AN NRC

TRIENNIAL HEAT SINK PERFORMANCE INSPECTION AND REQUEST FOR

INFORMATION; INSPECTION REPORT 05000373/2018002; 05000374/2018002

Dear Mr. Hanson:

On June 18, 2018, the U.S. Nuclear Regulatory Commission (NRC) will begin the onsite portion

of the Triennial Heat Sink Performance Inspection at your LaSalle County Station, Units 1 and

2. 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 April 23, 2018.

By May 4, 2018, 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 June 4, 2018. 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

June 11, 2018. 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 during the inspection.

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 Vance Petrella. We understand that our licensing

contact for this inspection is Terry Lanc 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.

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/

Vance Petrella, Reactor Engineer

Engineering Branch 2

Division of Reactor Safety

Docket Nos. 50-373; 50-374

License Nos. NPF-11; NPF-18

Enclosure:

Document Request for Triennial Heat Sink

Performance Inspection

cc: Distribution via LISTSERV

B. Hanson -3-

Letter to Bryan C. Hanson from Vance Petrella dated March 23, 2018

SUBJECT: LASALLE COUNTY STATION, UNITS 1 AND 2NOTIFICATION OF AN NRC

TRIENNIAL HEAT SINK PERFORMANCE INSPECTION AND REQUEST FOR

INFORMATION; INSPECTION REPORT 05000373/2018002; 05000374/2018002

DISTRIBUTION:

Jeremy Bowen

RidsNrrDorlLpl3

RidsNrrPMLaSalle

RidsNrrDirsIrib Resource

Steven West

Darrell Roberts

Richard Skokowski

Allan Barker

DRPIII

DRSIII

ADAMS Accession Number ML: 18082B381

OFFICE RIII RIII RIII RIII

NAME VPetrella:cl

DATE 03/23/18

OFFICIAL RECORD COPY

DOCUMENT REQUEST FOR TRIENNIAL HEAT SINK PERFORMANCE INSPECTION

Inspection Report: 05000373/2018002; 05000374/2018002

Inspection Dates: June 18-22, 2018

Inspection Procedure: IP 71111.07, Heat Sink Performance

Lead Inspector: Vance Petrella

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 April 23, 2018

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,

aging, heat exchanger testing, and safety-related service water systems 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,

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.

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

DOCUMENT REQUEST FOR TRIENNIAL HEAT SINK PERFORMANCE INSPECTION

8. Electronic copies of the current Final Safety Analysis Report, 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 and closed cooling

water systems (as applicable).

II. Information Requested By June 4, 2018

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 Updated Final Safety Analysis Report (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

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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DOCUMENT REQUEST FOR TRIENNIAL HEAT SINK PERFORMANCE INSPECTION

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 system (or equivalent):

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 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 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 and safety-related service water systems including

procedures for loss of these systems.

h. Copies of corrective action documents associated with waterhammer or

hydraulic transients in the service water system since the last Heat Sink

Inspection.

i. If available, provide an electronic copy of piping and instrumentation

diagrams for the service water system, including the intake structure.

j. Provide a list of calculations (with a short description), which currently apply

to UHS and safety-related service water system.

k. 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.

l. 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.

m. 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 onsite portion

of the inspection.

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DOCUMENT REQUEST FOR TRIENNIAL HEAT SINK PERFORMANCE INSPECTION

III. Information Requested By June 11, 2018

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. The documents that describe the controls that prevent heat exchanger

degradation due to excessive flow induced vibration during operation.

h. 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.

i. 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.

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

degraded tubes which are identified in each heat exchanger.

k. 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).

l. 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).

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DOCUMENT REQUEST FOR TRIENNIAL HEAT SINK PERFORMANCE INSPECTION

m. 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.

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.

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DOCUMENT REQUEST FOR TRIENNIAL HEAT SINK PERFORMANCE INSPECTION

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.

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