ML19158A078

Notification of NRC Triennial Heat Sink Performance Inspection (05000482/2019003) and Request for Information

ML19158A078
Person / Time
Site:	Wolf Creek
Issue date:	06/05/2019
From:	Vincent Gaddy Region 4 Engineering Branch 1
To:	Heflin A
Gaddy V
References
IR 2019003
Download: ML19158A078 (6)

See also: IR 05000482/2019003

Text

June 5, 2019

Adam C. Heflin, President and

Chief Executive Officer

Wolf Creek Nuclear Operating Corporation

P.O. Box 411

Burlington, KS 66839

SUBJECT: WOLF CREEK GENERATING STATION - NOTIFICATION OF NRC TRIENNIAL

HEAT SINK PERFORMANCE INSPECTION (05000482/2019003) AND

REQUEST FOR INFORMATION

Dear Mr. Heflin:

The purpose of this letter is to notify you that U.S. Nuclear Regulatory Commission (NRC) staff

will conduct a triennial heat sink performance inspection at your Wolf Creek Generating Station

from July 29, 2019 - August 2, 2019. The inspection will consist of two reactor inspectors from

the NRCs Region IV office for one week. The inspection will be conducted in accordance with

the triennial review portion of NRC Inspection Procedure 71111.07, "Heat Sink Performance."

Experience has shown that this inspection is resource intensive both for the NRC inspectors

and your staff. In order to minimize the impact to your onsite resources and to ensure a

productive inspection, we have enclosed a request for documents needed for this inspection.

Please note that the documents are requested to be provided by July 15, 2019. We request

that during the onsite inspection week you ensure that copies of analyses, evaluations, or

documentation regarding the implementation and maintenance of your heat exchanger program

are available. Of specific interest are those documents that establish that your heat exchanger

program satisfies NRC regulatory requirements and conforms to applicable NRC guidance.

Also, appropriate personnel knowledgeable of safety-related heat exchangers should be

available to support the inspector at the site during the inspection.

We have discussed the schedule for this inspection activity with your staff and understand that

our regulatory contact for this inspection will be Jason Knust of your licensing organization. If

there are any questions about this inspection or the material requested, please contact the lead

inspector, Chad Stott, by telephone at 817-200-1526 or by e-mail at Chad.Stott@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.

A. Heflin 2

This letter, its enclosure, and your response (if any) 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/

Vincent G. Gaddy, Chief

Engineering Branch 1

Division of Reactor Safety

Docket No. 50-482

License No. NPF-42

Enclosure:

Triennial Heat Sink Performance Inspection

Request for Information

cc: Electronic Distribution to Wolf Creek Generating Station

Request for Information

Triennial Heat Sink Performance Inspection

Wolf Creek Generating Station

Inspection Report: 05000482/2019003

Inspection Dates: July 29 - August 2, 2019

Inspection Procedure: IP 71111.07, Triennial Heat Sink Performance

Inspectors: Chad Stott, Reactor Inspector

Jonathan Braisted, Reactor Inspector

Information Requested for the In-Office Preparation Week

The following information should be sent to the Region IV office in hard copy or electronic

format, to the attention of Chad Stott, by July 15, 2019. The inspector will review specific items

from the information requested below and then request from your staff additional documents

needed during the onsite inspection week. Also, we request that you categorize the documents

in your response with the numbered list below. Please provide requested documentation

electronically, if possible. If requested documents are large and only hard copy formats are

available, please inform the inspector and provide subject documentation during the first day of

the onsite inspection. If you have any questions regarding this information request, please call

the lead inspector as soon as possible.

The following heat exchangers/heat sinks have been selected for inspection:

• Component Cooling Water Heat Exchanger EEG01B

• Containment Air Cooler SGN01C

• Control Room A/C SGK04A

• Ultimate Heat Sink

General document requests, as applicable:

1. Copies of any heat exchanger program self-assessments or audits performed since the

last triennial heat sink inspection

2. Copies of any heat exchanger program documents or descriptions

3. List of commitments (with descriptions) to the Generic Letter 89-13 program

4. Copies of the updated final safety analysis report, technical specifications, and technical

requirements manual

For all heat exchangers listed above, as applicable:

5. Copies of design bases documents, system health reports, and maintenance rule

system notebooks

Enclosure

6. List of corrective action program documents (with descriptions), including any operability

determinations, since the last triennial heat sink inspection

7. List of any design changes (with descriptions) implemented since the last triennial heat

sink inspection

8. List of any surveillance activities or preventive maintenance tasks (with descriptions) and

frequency

9. Copies of simplified piping and instrumentation drawings or diagrams

10. Copies of the two most recent thermal performance tests and instrument uncertainties

used during testing

11. Copies of the two most recent documents that verify structural integrity (i.e., eddy current

summary sheets, ultrasonic testing results, and visual inspection results, etc.)

12. Copies of documents that describe the methods taken to control water chemistry

13. List of calculations (with descriptions) which currently apply to each heat exchanger

14. Copies of vendor data sheets

15. 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

16. 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)

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

excessive tube vibration in the heat exchanger or associated piping

18. Copy of the document which identifies the current number of tubes in service for each

heat exchanger (e.g., tube plugging map) and the supporting calculation which

establishes the maximum number of tubes which can be plugged in each heat

exchanger

19. Copy of the document establishing the repair criteria for degraded tubes

For the ultimate heat sink, as applicable:

20. List of corrective action program documents (with descriptions), including any operability

determinations, since the last triennial heat sink inspection

21. Dam inspections that monitor the integrity of the ultimate heat sink

22. Copies of calculations and surveillances that determine the ultimate heat sink reservoir

capacity and heat transfer capability

2

23. Copies of procedures for a loss of ultimate heat sink or safety-related service water

system

24. Copies of the most recent inspections and/or maintenance related to macrofouling (silt,

mussel shells, debris, etc.) and aquatic life

25. Copies of the most recent inspections and/or maintenance related to preventing biotic

fouling

26. Copies of procedures and most recent test results to survey or monitor interface valves

between the safety-related section of the service water system and the non-safety

related section

27. Copy of the most recent safety-related service water flow balance test results, both as-

found and as-left

28. History of any thru-wall pipe leaks on the safety-related service water system

29. List of corrective action program documents (with descriptions), including any operability

determinations, since the last triennial heat sink inspection

Inspector Contact Information:

Chad Stott, Lead Jonathan Braisted

Reactor Inspector Reactor Inspector

817-200-1526 817-200-1469

Chad.Stott@nrc.gov Jonathan.Braisted@nrc.gov

Mailing Address:

U.S. NRC, Region IV

Attn: Chad Stott

1600 East Lamar Blvd.

Arlington, TX 76011-4511

3

ML19158A078

SUNSI Review: ADAMS: Non-Publicly Available Non-Sensitive Keyword: NRC-002

By: CAS Yes No Publicly Available Sensitive

OFFICE RI:EB1 RI:EB1 C:EB1

NAME CStott JBraisted VGaddy

SIGNATURE /RA/ /RA/ /RA/

DATE 5/23/2019 5/22/2019 6/5/2019