ML19330F863

Regulatory Audit Summary Regarding License Amendment Request to Revise Technical Specification 3.3.5, Loss of Power (LOP) Diesel Generator (DG) Start Instrumentation,

ML19330F863
Person / Time
Site:	Wolf Creek
Issue date:	12/06/2019
From:	Balwant Singal Plant Licensing Branch IV
To:	Reasoner C Wolf Creek
Singal B, NRR/DORL/LPL4-1
References
EPID L-2019-LLA-0062
Download: ML19330F863 (6)

Text

WASHINGTON, D.C. 20555-0001 December 6, 2019 Mr. Cleveland Reasoner Chief Executive Officer and Chief Nuclear Officer Wolf Creek Nuclear Operating Corporation P.O. Box 411 Burlington, KS 66839

SUBJECT:

WOLF CREEK GENERATING STATION, UNIT 1-REGULATORY AUDIT

SUMMARY

REGARDING LICENSE AMENDMENT REQUEST TO REVISE TECHNICAL SPECIFICATION 3.3.5, "LOSS OF POWER (LOP) DIESEL GENERATOR (DG) START INSTRUMENTATION" (EPID L-2019-LLA-0062)

Dear Mr. Reasoner:

By letter dated March 18, 2019, as supplemented by letters dated August 22, September 10, and November 13, 2019, Wolf Creek Nuclear Operating Corporation submitted a license amendment request (LAR) for Wolf Creek Generating Station, Unit 1 regarding revision to Technical Specification 3.3.5, "Loss of Power (LOP) Diesel Generator (DG) Start Instrumentation."

Specifically, the amendment proposes to revise the degraded voltage and loss of voltage relays allowable values and nominal trip setpoints (voltage and time delays) specified in Surveillance Requirement 3.3.5.3.

To support its review of the LAR, the U.S. Nuclear Regulatory Commission staff conducted a regulatory audit via internet-based portal from June 17 to November 20, 2019, to verify information submitted by the licensee and the supporting documentation. The regulatory audit summary is enclosed with this letter.

C. Reasoner If you have any questions, please contact me at 301-415-3016 or via e-mail at Sincerely,

~qD. d- ~i\;t~

Balwant K ~ . Senior Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-482

Enclosure:

Regulatory Audit Summary cc: Listserv

REGULATORY AUDIT

SUMMARY

FOR JUNE 17- NOVEMBER 20, 2019 AUDIT IN SUPPORT OF THE REVIEW OF LICENSE AMENDMENT REQUEST FOR REVISION TO TECHNICAL SPECIFiCATION 3.3.5, "LOSS OF POWER (LOP)

DIESEL GENERATOR (DG) START INSTRUMENTATION" WOLF CREEK NUCLEAR OPERATING CORPORATION WOLF CREEK GENERATING STATION, UNIT 1 DOCKET NO. 50-482

1.0 BACKGROUND

By letter dated March 18, 2019 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML19086A111 ), as supplemented by letters dated August 22, September 10, and November 13, 2019 (ADAMS Accession Nos. ML19239A112, ML19260D630, and ML19326A162, respectively), Wolf Creek Nuclear Operating Corporation (the licensee) submitted a license amendment request (LAR) for Wolf Creek Generating Station, Unit 1, regarding revision to Technical Specification 3.3.5, "Loss of Power (LOP) Diesel Generator (DG)

Start Instrumentation." Specifically, the amendment proposes to revise the degraded voltage (DV) and loss of voltage (LOV) relays allowable values and nominal trip setpoints (voltage and time delays) specified in Surveillance Requirement 3.3.5.3.

The U.S. Nuclear Regulatory Commission (NRC) staff reviewed the calculations prepared/revised by the licensee in support of the LAR and referenced in the licensee's evaluation via an internet-based portal. The scope of the audit was primarily focused on the review of the licensee's calculations/analyses related to the proposed change. The calculations were reviewed to determine if the licensee needs to submit any additional information contained in the analyses performed in support of the requested change and to develop conclusions for the staff's safety evaluation. An audit plan was issued by the NRC staff by letter dated June 13, 2019 (ADAMS Accession No. ML19162A106).

2.0 AUDIT DATES AND LOCATION The regulatory audit was conducted via internet portal from June 17 to November 20, 2019.

3.0 AUDIT TEAM MEMBERS The NRC audit team members consisted of:

• Mr. Vijay Goel, Electrical Engineering Operating Reactor Branch, Office of Nuclear Reactor Regulation (NRR) (Technical Team Lead)

• Mr. Stephen Wyman, Electrical Engineering Operating Reactor Branch, NRR

• Mr. Balwant Singal, NRR (Project Manager)

Enclosure

4.0 DOCUMENTS AUDITED The following documents prepared by the licensee in support of the LAR were reviewed during the audit:

• Analysis/Calculation related to "Establish DV Relay Dropout Setting (Minimum Operating Voltage Limit)," as described in LAR, Attachment I, Section 3.1.1.

[Calculation No. XX-E-009-001-CN006, "System NB, NG, PG Undervoltage/Degraded Voltage."]

• Analysis/Calculation related to "Confirm Adequacy of DV Relay Dropout Setting for Motor Starting," as described in LAR, Attachment I, Section 3.1.2. [Calculation No. XX-E-009-001-CN006, "System NB, NG, PG Undervoltage/Degraded Voltage."]

• Analysis/Calculation related to "Establish DV Relay Time Delay (with accident signal),"

as described in LAR, Attachment I, Section 3.1.3. [Calculation No. XX-E-009-001-CN006, "System NB, NG, PG Undervoltage/Degraded Voltage."]

• Analysis/Calculation related to "Confirm Reset of DV Relay with Minimum Required Grid Voltage," as described in LAR, Attachment I, Section 3.1.4. [Calculation No. XX-E-009-001-CN006, "System NB, NG, PG Undervoltage/Degraded Voltage," and Calculation No. XX-E-006, Revision 8, "AC System Analysis."]

• Analysis/Calculation related to "Confirm LOV Relay Setpoint Prevents Motor Stalling,"

as described in LAR, Attachment I, Section 3.1.5. [Calculation No. XX-E-009-001-CN006, "System NB, NG, PG Undervoltage/Degraded Voltage."]

• Analysis/Calculation related to "Determine the setting of DV time delay relay with and without safety injection signal," as described in LAR, Attachment I, Section 3.3. [Calculation No. XX-E-009-001-CN006, "System NB, NG, PG Undervoltage/Degraded Voltage."]

5.0 AUDIT ACTIVITIES The audit was conducted by review of the relevant portions of calculations listed in Section 4.0, via internet-based portal. The focus of the audit was to review the licensee's calculations performed in support of the requested change.

Initial part of the audit was conducted from June 17 to July 12, 2019. The final Request for additional information (RAI) response was provided on November 13, 2019. Hence, the audit was extended by e-mail dated September 18, 2019 (ADAMS Accession No. ML19261A227), to facilitate the review of the RAI responses and an additional calculation was performed in support of the RAI responses. The audit was formally concluded on November 20, 2019.

6.0 AUDIT

SUMMARY

Based on the review of the calculations/analyses performed in support of the proposed technical specification changes and provided for the NRC staff review via the internet portal, the NRC staff identified the need for additional information by e-mail dated August 12, 2019 (ADAMS Accession No. ML19224A524). The additional information was provided by the licensee by letters dated August 22 and September 10, 2019.

The review of the responses to RAls 1, 2, 3, and 4, resulted in additional NRC staff questions. The NRC staff held a clarification call with the licensee on October 8, 2019.

The following NRC and WCNOC staff participated during the call:

NRC/NRR Vijay Goel, Donna Williams, Steve Wyman, and Balwant K. Singal.

WCNOC Jason Knust, Nicole Good, Brad Kever, Saed Almajdoubah, and Ismail Boussag.

The licensee agreed to supplement the responses to the NRC staff Questions 1, 2, 3, and 4 to address additional NRC staff concerns 1 . The supplemental response to the NRC staff questions was provided by WCNOC letter dated November 13, 2019.

The NRC staff verified that the information provided in the LAR and supplements agreed with the information provided in the calculations/analyses on the internet-based portal.

7 .0 . EXIT BRIEFING The audit was performed via internet-based portal. After the review of the information provided by the licensee by letter dated November 13, 2019, the licensee was informed via phone that the NRC staff did not require any additional information to complete the review of the application.

1 Refer to WCNOC letter dated November 13, 2019 for the description of the NRC staff questions.

ML19330F863 via email dated OFFICE NRR/DORL/LPL4/PM NRR/DORL/LPL4/LA NRR/DEX/EEOB/BC NAME BSingal PBlechman BTitus DATE 12/02/19 12/02/19 12/04/19 OFFICE NRR/DORL/LPL4/BC NRR/DORL/LPL4/PM NAME JDixon-Herrity BSingal DATE 12/06/19 12/06/19