ML21123A041

Notification of NRC Design Bases Assurance Inspection (Teams) (05000482/2021010) and Initial Request for Information

ML21123A041
Person / Time
Site:	Wolf Creek
Issue date:	05/05/2021
From:	Vincent Gaddy Region 4 Engineering Branch 1
To:	Reasoner C Wolf Creek
References
IR 2021010
Download: ML21123A041 (7)

See also: IR 05000482/2021010

Text

May 5, 2021

Mr. Cleve Reasoner, Chief Executive Officer

and Chief Nuclear Officer

Wolf Creek Nuclear Operating Corp.

P.O. Box 411

Burlington, KS 66839

SUBJECT: WOLF CREEK GENERATING STATION - NOTIFICATION OF NRC DESIGN

BASES ASSURANCE INSPECTION (TEAMS) (05000482/2021010) AND

INITIAL REQUEST FOR INFORMATION

Dear Mr. Reasoner:

On June 23, 2021, the U.S. Nuclear Regulatory Commission (NRC) will begin a triennial

baseline Component Design Bases Inspection at the Wolf Creek Generating Station. A six-

person team will perform this inspection using NRC Inspection Procedure 71111, Attachment

21M Design Bases Assurance Inspection (Teams).

The inspection focuses on the maintenance of component design bases and modifications

made to structures, systems, and components. The samples reviewed during this inspection

will be identified during an information gathering visit and during the subsequent in-office

preparation week. In addition, a number of operating experience issues will also be selected for

review.

The inspection will include an information gathering site visit by the team leader, and two weeks

of onsite inspection by the team. The inspection will consist of six NRC inspectors who will

focus on engineering and operations. The current inspection schedule is as follows:

Onsite Information Gathering Visit: June 23, 2021

Preparation Week: July 12-16, 2021

Onsite Weeks: July 19-23, 2021, and August 2-6, 2021

The purpose of the information gathering visit is to meet with members of your staff to identify

potential risk-significant components and operator actions. The lead inspector will also request

a tour of the plant with members of your operations staff and probabilistic safety assessment

staff. During the onsite weeks, several days will be needed on the plant-referenced simulator in

order to facilitate the development of operator action-based scenarios. Additional information

and documentation needed to support the inspection will be identified during the inspection,

including interviews with engineering managers, engineers, and probabilistic safety assessment

staff.

Our experience with these inspections has shown that they are extremely resource intensive,

both for the NRC inspectors and the licensee staff. In order to minimize the inspection impact

C. Reasoner 2

on the site and to ensure a productive inspection, we have enclosed a request for information

needed for the inspection. The request has been divided into two groups. The first group lists

information necessary for the information gathering visit and for general preparation. This

information should be available to the regional office no later than June 14, 2021, unless

otherwise stated. If possible, this information should be provided electronically to the lead

inspector. Since the inspection will be concentrated on high risk/low margin components and

modifications, calculations associated with your list of high risk components and modifications

should be available to review during the information gathering visit to assist in our selection of

components based on available design margin.

The second group of documents requested lists information necessary to aid the inspection

team in tracking issues identified as a result of the inspection. It is requested that this

information be provided to the lead inspector as the information is generated during the

inspection. An additional request will be made by the team during the preparation week once

the specific components and modifications have been selected. Additional requests by

inspectors will also be made throughout the onsite weeks for specific documents needed to

complete the review. It is important that all of these documents are up-to-date and complete in

order to minimize the number of additional documents requested during the preparation and/or

onsite portions of the inspection. In order to facilitate the inspection, we request that a contact

individual be assigned to each inspector to ensure information requests, questions, and

concerns are addressed in a timely manner.

The lead inspector for this inspection is Gerond A. George. If there are any questions about the

inspection or the requested materials, please contact the lead inspector by telephone at 817-

200-1562, or by e-mail at Gerond.George@nrc.gov.

PAPERWORK REDUCTION ACT STATEMENT

This letter contains mandatory information collections that are subject to the Paperwork

Reduction Act of 1995 (44 U.S.C. 3501 et seq.). The Office of Management and Budget (OMB)

approved these information collections (approval number 3150-0011). Send comments

regarding this information collection to the Information Services Branch, Office of the Chief

Information Officer, Mail Stop: T6 A10M, U.S. Nuclear Regulatory Commission, Washington,

DC 20555-0001, or by e-mail to Infocollects.Resource@nrc.gov, and to the Desk Officer, Office

of Information and Regulatory Affairs, NEOB-10202, (3150-0011) Office of Management and

Budget, Washington, DC 20503.

PUBLIC PROTECTION NOTIFICATION

The NRC may not conduct nor 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 OMB control number.

In accordance with Title 10 of the Code of Federal Regulations (10 CFR) 2.390 of the NRC's

"Rules of Practice," a copy of this letter will be made available electronically for public inspection

in the NRC Public Document Room or from the Publicly Available Records (PARS) component

C. Reasoner 3

of NRCs document 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,

Digitally signed by Vincent G.

Vincent G. Gaddy Gaddy

Date: 2021.05.05 07:18:50 -05'00'

Vincent G. Gaddy, Chief

Engineering Branch 1

Division of Reactor Safety

Docket No. 50-482

License No. NPF-42

Enclosure: Design Bases Assurance

Inspection (Teams) Request for

Information

cc w/ encl: Distribution via LISTSERV

ML21123A041

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

By: GAG Yes No Publicly Available Sensitive NRC-002

OFFICE SRI:EB1 C:EB1

NAME GGeorge VGaddy

SIGNATURE /RA/ /RA/

DATE 5/5/21 5/5/21

Initial Request for Information

Design Bases Assurance Inspection (Teams)

Wolf Creek Generating Station

Inspection Report: 05000482

EPID ID: I-2021-010-0022

Information Gathering Date: June 23, 2021

Inspection Dates: July 19-23, 2021, and August 2-6, 2021

Inspection Procedure: IP 71111, Attachment 21M, Design Bases Assurance

Inspection (Teams)

Lead Inspector: Gerond A. George, Senior Reactor Inspector

I. Information Requested Prior to Information Gathering Visit (provide by June 14,

2021)

The following information (Section I of this enclosure) should be sent to the Region IV

office in hard copy or electronic format (electronic database preferred), to the attention of

Gerond A. George by June 14, 2021, to facilitate the reduction in the items to be

selected for a final list during the preparation week. The inspection team will finalize the

selected list during the prep week using the additional documents requested in Section II

of this enclosure. The specific items selected from the lists shall be available and ready

for review on the day indicated in this request. *Please provide requested

documentation electronically in pdf files, Excel, or other searchable formats, if possible.

The information 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 pressurized water reactor technology. 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.

1. An Excel spreadsheet of equipment basic events (with definitions), including

importance measures sorted by risk achievement worth and Fussell-Vesely from

your internal events probabilistic risk assessment (PRA). Include basic events with

risk achievement worth value of 1.3 or greater.

2. A list of the top 50 cut-sets from your PRA.

3. Copies of probabilistic risk assessment system notebooks and the latest

probabilistic risk assessment summary document.

4. An Excel spreadsheet of probabilistic risk assessment human action basic events or

risk ranking of operator actions from your site-specific probabilistic safety

assessment (PSA) sorted by risk achievement worth and Fussell-Vesely. Provide

copies of your human reliability worksheets for these items.

5. If you have an external events or fire PSA model, provide the information requested

in items 1-4 for external events and fire.

Enclosure

6. A list of high large early release frequency impact events and associated

components.

7. Structures, systems, and components in the Maintenance Rule (a)(1) category.

8. A list of high risk maintenance rule systems/components and functions; based on

engineering or expert panel judgment.

9. Site top 10 issues list, if available.

10. Any pre-existing list of components and associated calculations with low design

margins.

11. A list of operating experience evaluations for the last 3 years.

12. A list of all time-critical operator actions in procedures.

13. A list of current operator work arounds/burdens.

14. Procedures, including emergency and abnormal, used to accomplish operator

actions associated with the basic events credited in your PRA.

15. Lists of permanent and temporary modifications performed in the past 5 years to

structures, systems, and components sorted by component identified in Item 1.

16. List of root cause evaluations associated with component failures or design issues

initiated/completed in the last 5 years.

17. A list of any common-cause failures of components in the last 3 years.

18. A copy of any internal/external self-assessments and associated corrective action

documents generated in preparation for this inspection.

19. A copy of engineering/operations-related audits completed in the last 2 years.

20. Electronic copies of the Technical Specifications, Technical Specifications Bases,

and the Final Safety Analysis Report, as updated.

21. A copy of the Individual Plant Examination of External Events, if available

electronically.

22. One-line drawings of emergency core cooling system, ultimate heat sink, emergency

feedwater, safety-related electrical systems.

23. A copy of condition reports associated with inspection findings from the previous

NRC Inspection Procedure 71111.21 (or 71111.21 Attachment M inspection).

24. A list of licensee contacts for the inspection team with phone numbers.

25. A copy of the current management and engineering organizational charts.

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II. Information Requested to be provided throughout the inspection.

1. Electronic copies of the design bases documents for selected components and

modifications.

2. Electronic copies of the system health notebooks for selected components and

modifications.

3. A list of the design calculations that provide the design margin information for

selected components. (Calculations for selected components should be available

during the information gathering visit).

4. Calculations and drawings associated with selected components.

5. Modification documentation associated with modifications selected from Item I.15,

this includes:

a. Post-modification testing, including performance characteristics affected,

assumptions, and acceptance criteria associated with modifications

selected.

b. Updated maintenance and surveillance procedures associated with

modifications.

c. Updated operation procedures and training plans associated with the

modifications.

6. Copies of any corrective action documents generated as a result of the teams

questions or queries during this inspection.

7. Copies of the list of questions submitted by the team members and the

status/resolution of the information requested (provide daily during the inspection to

each team member).

Inspector Contact Information:

Gerond A. George

Senior Reactor Inspector

817-200-1562

Gerond.George@nrc.gov

Mailing Address:

U.S. NRC, Region IV

Attn: Gerond A. George

1600 East Lamar Blvd.

Arlington, TX 76011-4511

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