ML20302A478

OPC R1 Request for Information

ML20302A478
Person / Time
Site:	Wolf Creek
Issue date:	10/28/2020
From:	Fabian Thomas Region 4 Engineering Branch 1
To:
References
Download: ML20302A478 (2)

Text

ADAMS Accession No. ML20302A478 TI 2515/194 Revision One Inspection Documentation Request Please provide the following additional documentation (Items 1 - 4) to the inspector prior to the onsite inspection date, preferably no later than January 15, 2021. The information should be provided in electronic format or a secure document management service. Please provide an index of the requested documents which includes a brief description of the document and the numerical heading associated with the request (i.e., where it can be found in the list of documents requested).

Fabian Thomas, Inspector RIV/DRS/Engineering Branch 1 (EB-1) 1600 E. Lamar Blvd.

Arlington, TX 76011 (817) 200-1126 (Office)

Fabian.Thomas@nrc.gov

1. Copies of your licensing basis changes to Updated Final Safety Analysis Report (UFSAR) which discuss the design features and analyses related to the effects of, and protection for, any open phase condition design vulnerability. If these documents have not been updated, provide documentation of your plans to do so.

2. Copies of any site training the inspector will need to accomplish in order to gain access to areas with, or planned, major electrical equipment used in your OPC solution (i.e.

switchyard, control room, simulator).

3. Copies of any PRA evaluations for your plant response to an open phase condition. Include Event Trees and Fault Trees developed/used as part of your analysis

4. Copies of any HRA evaluations for your proposed or existing operator actions in procedures used to identify and mitigate open phase conditions. Ensure you include timing information for any operator actions.

Please provide the following documentation to the inspector once onsite. Whenever practical, please provide copies electronically, except for drawings. Drawings should be provided as paper copies of sufficient size (ANSI C or D) such that all details are legible.

5. A brief presentation describing your electric power system design and typical electrical transmission and distribution system alignments; OPC design schemes installed to detect, alarm and actuate (if applicable); bus transfer schemes; and maintenance and surveillance requirements. This presentation should be a general overview of your system. Please schedule the overview shortly after the Entrance meeting.

6. Plant layout and equipment drawings for areas that identify: (a) the physical plant locations of major electrical equipment used in your open phase condition solution and procedures; (b) the locations of detection and indication equipment used in the open phase condition sensing circuits.

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7. Summary and discussion about the plant PRA model for an OPC. Include your Human Reliability Analysis (HRA). Please discuss any sensitivity analyses performed, and the results. Also, discuss any assumptions made which bound the sensitivity analysis.

Please set up the following evolutions/access for the inspector when onsite:

8. Access to locations in which open phase condition equipment is installed (i.e., switchyard, etc.)

9. An operator walkthrough of your OPC response procedures. Include any control room time critical operator actions (use of the simulator may be the preferred method).

10. A discussion of the timeline and consequences of an extended duration unbalanced voltage condition and how it may affect electric equipment, if OPC is not automatically isolated; Also, please provide the following previously requested TI-2515/194, Revision 1, documentation by January 15, 2021. The information should be provided in electronic format or a secure document management service. Please provide an index of the requested documents which includes a brief description of the document and the numerical heading associated with the request (i.e., where it can be found in the list of documents requested).

NEI 19-02 evaluation(s)

Calculations and analysis related to acceptable plant response to an OPC when using manual actions Any updated drawings, procurement specifications, test reports, or modification packages (including 10 CFR 50.59 evaluations (if any changes))

Maintenance procedures/Model work orders for the OPC equipment Surveillances for the OPC equipment (if any)

Testing (for any changes to the equipment)

Alarm response procedures PAPERWORK REDUCTION ACT STATEMENT 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 31500011. 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.

This letter 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.