ML21077A016

Notification of NRC Design Bases Assurance Inspection (Team) (05000313/2021010 and 05000368/2021010) and Initial Request for Information

ML21077A016
Person / Time
Site:	Arkansas Nuclear
Issue date:	03/22/2021
From:	Vincent Gaddy Region 4 Engineering Branch 1
To:	Dinelli J
References
IR 2021010
Download: ML21077A016 (7)

See also: IR 05000313/2021010

Text

March 22, 2021

Mr. John Dinelli, Site Vice President

Arkansas Nuclear One

Entergy Operations, Inc.

N-TSB-58

1448 S.R. 333

Russellville, AR 72802-0967

SUBJECT: ARKANSAS NUCLEAR ONE - NOTIFICATION OF NRC DESIGN BASES

ASSURANCE INSPECTION (TEAM) (05000313/2021010 AND

05000368/2021010) AND INITIAL REQUEST FOR INFORMATION

Dear Mr. Dinelli:

On May 17, 2021, U.S. Nuclear Regulatory Commission (NRC) staff will begin a triennial

baseline Design Bases Assurance Inspection at Arkansas Nuclear One. A team of five

inspectors will perform this inspection using NRC Inspection Procedure 71111.21M, Design

Bases Assurance Inspection (Team).

This inspection of component design bases and modifications made to structures, systems, and

components (SSCs) verifies that plant components are maintained within their design basis.

This inspection also provides monitoring of the capability of the selected components and

operator actions to perform their design bases functions. Additionally, this inspection verifies

that risk significant issues resulting from generic communications have been adequately

addressed.

This inspection requires a review of 8-12 risk informed samples and 1-3 operating experience

samples. Risk informed samples will consist of 4-6 components and 4-6 modifications. The

samples reviewed during this inspection will be identified during an information gathering visit

and/or during the subsequent in-office preparation week.

The inspection will include an information gathering site visit by the lead inspector and two

weeks of onsite inspection by the entire team. The current inspection schedule is as follows:

Onsite Information Gathering Visit: May 17-20, 2021

Inspection Preparation Weeks: June 1-4 and June 21-25, 2021

Onsite Inspection Weeks: June 14-18 and June 28 - July 2, 2021

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

both for the NRC inspectors and the licensee staff. To minimize the inspection impact on the

site and to ensure an efficient inspection, we have enclosed an initial request for information

needed for the inspection. The request has been divided into three groups. Generally, the first

group lists information necessary for the information gathering visit and for overall preparation;

the second group of information lists information necessary for sample-specific inspection

J. Dinelli 2

preparation; and the third group lists information necessary throughout the remainder of the

inspection. This information should be provided electronically by the dates listed in the

enclosure (and should also be sorted in a consistent manner). If this is not possible, please

inform the lead inspector as soon as practicable. Additionally, it is important that this

information is 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. Finally, we request

that a contact individual be assigned to each inspector to ensure information requests,

questions, and concerns are addressed in a timely manner.

As stated, the first group of information is intended to aid the lead inspector during the

information gathering visit to identify potential risk-significant SSCs, operator actions, operating

experience, and modification samples. The lead inspector will also request a tour of the plant

with members of your operations staff and probabilistic safety assessment staff. Additional

information and/or documentation needed to support the inspection may be identified during the

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

assessment staff. Between the information gathering visit and the initial preparation, the lead

inspector will choose the inspection samples and communicate them to your staff. Please note

that the team may make changes to the sample selections during the preparation week.

Similarly, the second group of information is intended to provide sample-specific information to

the inspection team. Please note that the inspection team may identify additional information

and/or documentation needed to support the inspection during the initial preparation week. This

information will be communicated by the lead inspector as soon as practicable. This information

may include requests for plant tours, interviews with staff, etc. during the onsite portions of the

inspection.

Finally, the third 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. Please also note that additional requests by inspectors will also be made throughout

the onsite weeks for specific documents needed to complete the review, which may also include

additional plant tours, interviews with staff, etc.

The lead inspector for this inspection is Wayne Sifre. We understand that our licensing

engineer contact for this inspection is Ms. Natalie Mosher. If there are any questions about the

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

200-1193 or by e-mail at wayne.sifre@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.

J. Dinelli 3

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 Section 2.390 of the NRC's

"Rules of Practice and Procedure," 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

component of NRCs document system 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,

Vincent G. Digitally signed by Vincent G.

Gaddy

Gaddy Date: 2021.03.22 09:20:36

-05'00'

Vincent G. Gaddy, Chief

Engineering Branch 1

Division of Reactor Safety

Docket Nos. 50-313 and 50-368

License Nos. DPR-51 and NPF-6

Enclosure: Design Bases Assurance

Inspection (Team) Initial Request for Information

cc: Electronic Distribution via LISTSERV

ML21077A016

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

By: WCS Yes No Publicly Available Sensitive NRC-002

OFFICE SRI:EB1 C:EB1

NAME WSifre VGaddy

SIGNATURE /RA/ /RA/

DATE 3/22/2021 3/22/2021

Initial Request for Information

Design Bases Assurance Inspection (Team)

Arkansas Nuclear One

Inspection Report: 05000313/2021010 and 05000368/2021010

EPID ID: I-2021-010-0021

Information Gathering Dates: May 17-20, 2021

Inspection Dates: June 14-18 and June 28 - July 2, 2021

Inspection Procedure: IP 71111.21M, Design Bases Assurance Inspection

(Team)

Lead Inspector: Wayne Sifre, Senior Reactor Inspector

I. Information Requested for the Information Gathering Visit (May 17, 2021)

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. 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 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.

6. A list, if available, of low design margin components.

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

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

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

engineering or expert panel judgment.

10. Site top 10 issues list, if available.

Enclosure

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

margins.

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

13. A list of all time-critical or time-sensitive operator actions in procedures.

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

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

actions associated with the basic events credited in your PRA.

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

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

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

initiated/completed in the last 5 years.

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

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

documents generated in preparation for this inspection.

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

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

and the Final Safety Analysis Report, as updated.

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

electronically.

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

feedwater, safety-related electrical systems.

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

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

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

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

II. Information Requested for the Inspection Preparation Week (June 1, 2021)

1. Electronic copies of the design bases documents (or system descriptions) for selected

components and modifications.

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

modifications.

3. A list of relevant design calculations.

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4. Calculations and drawings associated with selected components.

5. Modification documentation associated with modifications selected. 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.

III. Information Requested Throughout Inspection (June 14, 2021)

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

questions or queries during this inspection.

2. 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:

Wayne Sifre James Drake Timothy Steadham

Senior Reactor Inspector Senior Reactor Inspector Senior Resident Inspector

817-200-1193 817-200-1558 817-200-1957

wayne.sifre@nrc.gov james.drake@nrc.gov Timothy.steadham@nrc.gov

Nnaerika Okonkwo Dustin Reinert

Reactor Inspector Reactor Inspector

817-200-1114 817-200-1534

nnaerika.okonkwo@nrc.gov dustin.reinert@nrc.gov

Mailing Address:

U.S. NRC, Region IV

Attn: Wayne Sifre

1600 East Lamar Blvd.

Arlington, TX 76011-4511

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