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Notification of an NRC Triennial Heat Sink Performance Inspection and Request for Information; Inspection Report 05000282/2016004; 05000306/2016004 (Gfo)
	ML16265A165
Person / Time
Site:	Prairie Island
Issue date:	09/20/2016
From:	O'Dwyer G; NRC/RGN-III/DRS/EB2
To:	Northard S; Northern States Power Company, Minnesota
References
	IR 2016004
	Download: ML16265A165 (8)
	v • d • e

UNITED STATES

NUCLEAR REGULATORY COMMISSION

REGION III

2443 WARRENVILLE RD. SUITE 210

LISLE, IL 60532-4352

September 20, 2016

Mr. Scott Northard

Site Vice President

Prairie Island Nuclear Generating Plant

Northern States Power Company, Minnesota

1717 Wakonade Drive East

Welch, MN 55089

SUBJECT: PRAIRIE ISLAND NUCLEAR GENERATING PLANT, UNITS 1 AND 2

NOTIFICATION OF AN NRC TRIENNIAL HEAT SINK PERFORMANCE

INSPECTION AND REQUEST FOR INFORMATION; INSPECTION REPORT

05000282/2016004; 05000306/2016004

Dear Mr. Northard:

On November 14, 2016, the U.S. Nuclear Regulatory Commission (NRC) will begin the onsite

portion of the Triennial Heat Sink Performance Inspection at your Prairie Island Nuclear Power

Plant, 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 September 30, 2016.

By October 10, 2016, 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 31, 2016. 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 November 14, 2016.

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.

S. Northard -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.

We understand that our licensing contact for this inspection is Pamela Johnson of your organization

and she has been informed that the lead inspector for this inspection is Gerard ODwyer. 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.

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, its enclosure, and your response (if any) will be available electronically for public

inspection in the NRCs Public Document Room or from the Publicly Available Records (PARS)

component of the NRC's 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,

/RA/

Gerard ODwyer, Reactor Inspector

Engineering Branch 2

Division of Reactor Safety

Docket Nos. 50-282, 50-306

License Nos. DPR-42, DPR-60

Enclosure:

Triennial Heat Sink Performance Inspection

Document Request

cc: Distribution via LISTSERV

TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST

Inspection Report: 05000282/2016004; 05000306/2016004

Inspection Dates: November 14 - 18, 2016

Inspection Procedure: IP 71111.07, Heat Sink Performance

Lead Inspector: Gerard ODwyer

630-829-9624

Gerard.ODwyer@nrc.gov

I. Information Requested By September 30, 2016:

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, or

heat exchanger testing, 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 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.

8. 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.

II Information Requested By October 31, 2016:

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.

Enclosure

TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST

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 CAP 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 to:

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.

6. For the Ultimate Heat Sink (UHS) including the Emergency Cooling Water Intake Pipe:

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 section of the document (e.g., UFSAR or Technical Requirements

Manual) that states the maximum safety related service 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).

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TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST

f. Copy of the construction code and Design Specification for the UHS.

g. Copies of normal, abnormal, and emergency operating procedures associated

with the UHS including procedures for loss of UHS.

h. Provide an electronic copy of piping and instrumentation diagrams or other

appropriate drawings for the service water system and the UHS, including the

intake structure.

i. Provide a list of calculations (with a short description), which currently apply to UHS.

j. Provide a list of instruments (with a short description) associated with automatic

or alarm functions for the UHS.

k. Provide a list of any design change (with a short description) performed on the

UHS since the last Heat Sink Performance Inspection.

7. An updated 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, November 14, 2016:

1. For both units, please provide a computer copy of UFSAR, Technical Specifications

and Bases, and Technical Requirements Manual.

2. 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 online 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 design specification and heat exchanger data sheets for each heat

exchanger.

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TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST

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 procedure that ensures 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).

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

chemistry in the heat exchangers.

3. For the UHS including the Emergency Cooling Water Intake Pipe:

a. 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.

b. Copies of the dam inspection procedures that monitor the integrity of the heat

sink 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.

c. Copies of calculations and surveillances that demonstrate the UHS reservoir

capacity and heat transfer capability including the Emergency Cooling Water

Intake Pipe.

d. 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.

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TRIENNIAL HEAT SINK PERFORMANCE INSPECTION DOCUMENT REQUEST

e. 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.

f. Copies of the procedures used for verifying that adjacent non-seismic or

nonsafety-related structures cannot degrade or block safety-related flow paths

during severe weather or seismic events.

g. Copy of the calculation associated with the structural integrity of 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.

4. 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.

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.

If any of the information requested above will not be available, please contact Gerard ODwyer

as soon as possible at 630-829-9624 or e-mail at Gerard.ODwyer@nrc.gov.

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