ML22068A231

Notification of NRC Design Bases Assurance Inspection (Team) 05000275/2022011 and 05000323/2022011 and Initial Request for Information

ML22068A231
Person / Time
Site:	Diablo Canyon
Issue date:	03/17/2022
From:	Vincent Gaddy NRC/RGN-IV/DORS
To:	Gerfen P Pacific Gas & Electric Co
References
IR 2022011
Download: ML22068A231 (8)

See also: IR 05000275/2022011

Text

March 17, 2022

Ms. Paula A. Gerfen, Senior Vice President

and Chief Nuclear Officer

Pacific Gas and Electric Company

P.O. Box 56

Mail Code 104/6

Avila Beach, CA 93424

SUBJECT: DIABLO CANYON POWER PLANT, UNITS 1 AND 2 - NOTIFICATION OF

NUCLEAR REGULATORY COMMISSION DESIGN BASES ASSURANCE

INSPECTION (TEAM) 05000275/2022011 AND 05000323/2022011) AND INITIAL

REQUEST FOR INFORMATION

Dear Ms. Gerfen:

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

conduct a triennial baseline design bases assurance inspection at your Diablo Canyon Power Plant

Units 1 and 2 beginning on May 9, 2022. The inspection will be conducted in accordance with NRC

Inspection Procedure (IP) 71111.21M, Design Bases Assurance Inspection (Team), dated

December 8, 2016, by a team lead, two electrical engineering-focused inspectors, two mechanical

engineering -focused inspectors, and one operations-focused inspector.

The inspection will consist of an information gathering visit by the team lead, in-office

preparation, and two weeks of onsite inspection. The current inspection schedule is as follows:

• Onsite Information Gathering Visit: May 9-13, 2022.

• In-office Preparation Weeks: June 6-10, 2022, and June 20-24, 2022.

• Onsite Inspection Weeks: June 13-17, 2022, and June 27-July 1, 2022.

The purpose of the information gathering visit is to identify potential risk significant samples and

operator actions. Additionally, the team lead will request a tour of the plant and interviews with

operations and probabilistic safety assessment staff. During the onsite weeks, several days and

administration will be needed on the plant-referenced simulator to facilitate performance of

operator action-based scenarios and job performance measures. It has not yet been

determined if the inspection will be onsite or conducted remotely. If the inspection is performed

remotely, we are requesting that, as a minimum, actual on-site time be made available for 1-2

days to perform component and modification walkdowns. Simulator activities would have to be

performed on site. 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.

P. Gerfen 2

The objectives of this inspection are to gain reasonable assurance that, 1) risk

significant structures, systems, and components can adequately perform their design

basis function, 2) modifications affecting the design and licensing bases have been

adequately implemented, and 3) risk significant issues resulting from generic

communications (i.e., operating experience) have been adequately

addressed. Completion of this inspection procedure consists of a minimum sample size

of eight component and modification samples and one operating experience sample.

To minimize the impact the inspection has on the site and to ensure an efficient inspection,

we have enclosed a request for information needed for the inspection. It is important that

these requests are fulfilled as completely and accurately as possible to minimize any

additional requests during the preparation or onsite inspection weeks. The requests have

been divided into three groups.

• The first group lists information necessary for our initial inspection scoping

activities and sample selections. This information should be available to

the team lead no later than April 29, 2022. By the end of the information

gathering visit, the team lead will communicate the initial list of component,

modification, and operating experience samples.

• The second group of information requested includes those items needed to

support our in-office preparation activities. This set of documents should be

available no later than June 3, 2022. This information should be separated for

each sample, especially if provided electronically. Note that the team may

identify additional information needed to support the inspection during this week

and will communicate those requests as soon as practicable.

• The third group of information requested includes the additional documentation

identified during in-office preparation activities as well as other resource

requests necessary to support our onsite inspection activities. The additional

information or resources should be available throughout the week of onsite

inspection activities beginning on June 13, 2022.

All information requested are to be for the time period from the onsite inspection period back

to the last triennial design bases assurance inspection (team). If nothing addressing a

request was done in that time period, then the request applies to the last applicable

document. If a request does not apply for any sample, no response is necessary. Include all

attachments to the requests, especially corrective action program documents.

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

regulatory contact for this inspection will be Ms. Amanda Sorensen. If there are any

questions about this inspection or the documents requested, please contact the lead

inspector, Ronald Kopriva, by telephone at 817-200-1104 or by e-mail at

Ron.Kopriva@nrc.gov.

P. Gerfen 3

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 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 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,

Vincent G. Digitally signed by

Vincent G. Gaddy

Gaddy Date: 2022.03.17 15:11:26

-05'00'

Vincent G. Gaddy, Chief

Engineering Branch 1

Division of Operating Reactor Safety

Docket Nos. 05000275 and 05000323

License Nos. DPR-80 and DPR-82

Enclosure:

Design Bases Assurance Inspection

(Team) Request for Information

cc w/ encl: Distribution via LISTSERV

ML22068A231

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

By: RAK Yes No Publicly Available Sensitive NRC-002

OFFICE DORS:EB1 DORS:EB1

NAME RAKopriva VGGaddy

SIGNATURE /RA/ /RA/

DATE 3/16/2022 3/17/2022

Initial Request for Information

Design Bases Assurance Inspection (Team)

DIABLO CANYON POWER PLANT UNITS 1 & 2

Inspection Report: 05000275/2022011 and 05000323/2022011

EPID ID: I-2022-011-0009

Information Gathering Date: May 9 - 13, 2022

Inspection Dates: June 13-17, 2022, and June 27-July 1, 2022

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

Inspection Team

Lead Inspector: Ronald A. Kopriva, Senior Reactor Inspector

I. Information Requested Prior to Information Gathering Visit (April 29, 2022)

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 Ronald A. Kopriva, Senior Reactor Inspector, by April 29, 2022, to

facilitate the reduction in the items to be selected for a final list. 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 boiling 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. A sortable list 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 sortable list of the top 50 cut-sets from your PRA.

3. A copy of any probabilistic risk assessment system notebooks and the latest

probabilistic risk assessment summary document.

Enclosure

4. A sortable list of probabilistic risk assessment human action basic events or risk

ranking of operator actions from your site-specific PRA 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 PRA model, provide the information

requested in items 1-4 for external events and fire.

6. A copy of the Individual Plant Examination of External Events (IPEEE).

7. A sortable list of high large early release frequency (LERF) impact events and

associated components.

8. A sortable list of structures, systems, and components in the Maintenance Rule

(a)(1) category.

9. A sortable list of high-risk maintenance rule systems/components and functions

based on engineering or expert panel judgment.

10. A list of the stations top 10 issues if available.

11. A list of structures, systems, and components with associated calculations having

low design margins if available.

12. A list of any common-cause failures of components.

13. A list of root cause evaluations associated with component failures of design

issues initiated/completed in the last 5 years.

14. A copy of any time-critical and time-sensitive program procedures and a list of all

time-critical and/or time-sensitive operator actions in procedures if not included.

15. A copy of any procedures used to accomplish operator actions associated with

the basic events credited in your PRA.

16. A sortable list of current operator work arounds/burdens and any program

procedures related to operator work arounds/burdens.

17. A list, with brief descriptions, of permanent and temporary modifications

implemented in the past 5 years to structures, systems, and components.

Implemented means accepted or placed into service and declared functional or

operable, as applicable. Modifications include, for example, permanent or

temporary plant changes, design changes, set point changes, procedure

changes, equivalency evaluations, suitability analyses, calculations, and

commercial grade dedications.

18. A sortable list with brief descriptions of operating experience evaluations opened

and/or closed. Include whether it was applicable and if the evaluation and any

associated actions, such as modifications, procedure updates, etc., are

complete.

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19. A copy of any internal/external self-assessments or audits and associated

corrective action documents generated in preparation for this inspection or

related to engineering or operations.

20. A copy of the technical specifications, surveillance frequency control program,

inservice testing program, preventive maintenance program, technical

requirements manual, and the final safety analysis report (as updated). Include

bases documents as applicable.

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

NRC design bases inspection.

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

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

II. Information Requested to be provided throughout the inspection. (To be

provided no later than June 3, 2022)

1. Components

a. A copy of the design bases document, system description, etc.

b. A copy of any vendor manuals (e.g., operation and maintenance)

c. A copy of any relevant, active calculations and drawings. If the number of

calculations and/or drawings is extensive, provide a list instead.

d. A list of the preventive maintenance schedule, including any inservice,

surveillance, etc. testing, and a copy of the most recent performance of each

e. A copy of the system health notebook

f. A copy of any corrective action documents covering the past 3 years

g. A copy of any relevant normal, abnormal, or emergency procedures

2. Modifications

a. A copy of the complete change package

b. A copy of the implementing work order, job, etc.

c. A copy of post-modification testing work orders, jobs, etc.

d. A copy of any associated corrective action documents

e. A copy of any vendor manuals (e.g., operation and maintenance)

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f. A copy of any updated procedures, licensing basis documents, calculations,

drawings, etc.

3. Operating Experiences

a. A copy of the complete operating experience evaluation

b. A copy of any associated corrective action documents

c. A copy of any associated change packages

d. A copy of any updated procedures, licensing basis documents, calculations,

drawings, etc.

III. Additional Requests During Onsite Inspection Activities:

1. A copy of any corrective action documents generated because of the team's

requests or questions during this inspection.

2. A copy of a list of questions submitted by the team and the status/resolution of the

information requested (provide daily during the inspection to each team member).

Inspector Contact Information:

Ronald Kopriva, Lead Jonathan Braisted Dustin Reinert

Senior Reactor Inspector Reactor Inspector Reactor Inspector

817-200-1104 817-200-1469 817-200-1534

Ron.Kopriva@nrc.gov Jonathan.Braisted@nrc.gov Dustin.Reinert@nrc.gov

Shiattin Makor Nnaerika Okonkwo TBD

Reactor Inspector Reactor Inspector Operations Engineer

817-200-1507 817-200-1114

Shiattin.Makor@nrc.gov Nnaerika.Okonkwo@nrc.gov

Mailing Address:

U.S. NRC, Region IV

ATTN: Ronald A.

Kopriva 1600 East

Lamar Blvd.

Arlington, TX 76011-

4511

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