HNP-18-002, Response to Request for Additional Information Regarding a License Amendment Request Proposing Changes to Emergency Diesel Generator Technical Specifications Surveillance Requirements

Response to Request for Additional Information Regarding a License Amendment Request Proposing Changes to Emergency Diesel Generator Technical Specifications Surveillance Requirements

ML18022A046
Person / Time
Site:	Harris
Issue date:	01/22/2018
From:	Hamilton T Duke Energy Progress
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
CAC MF9828, HNP-18-002
Download: ML18022A046 (12)

Text

Tanya M. Hamilton Vice President Harris Nuclear Plant 5413 Shearon Harris Rd New Hill, NC 27562-9300 919-362-2502 10 CFR 50.90 January 22, 2018 Serial: HNP-18-002 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 Shearon Harris Nuclear Power Plant, Unit 1 Docket No. 50-400 Renewed License No. NPF-63

Subject:

Response to Request for Additional Information Regarding A License Amendment Request Proposing Changes to Emergency Diesel Generator Technical Specifications Surveillance Requirements (CAC No. MF9828)

Ladies and Gentlemen:

By application dated June 5, 2017 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML17156A216), Duke Energy Progress, LLC (Duke Energy),

submitted a license amendment request to change Shearon Harris Nuclear Power Plant, Unit 1 (HNP) Technical Specifications Surveillance Requirements established for the Emergency Diesel Generators (EDGs). The proposed changes would restrict the steady-state voltage and frequency limits for EDG operation to ensure that accident mitigation equipment can perform as designed. The proposed changes would also increase the voltage limit for the EDG full load rejection test.

The Nuclear Regulatory Commission (NRC) staff reviewed the request and determined that additional information is needed to complete their review. Duke Energy provided a response to a request for additional information (RAI) from the NRC per letter dated November 27, 2017 (ADAMS Accession No. ML17331A354). Subsequently, the NRC determined a second RAI is needed in order to complete their review. Duke Energy received this second RAI from the NRC staff through electronic mail on December 7, 2017, with a required response date of January 22, 2018 (ADAMS Accession No. ML17360A013).

to this letter provides Duke Energys response to the RAI. In response to the RAI, the proposed TS changes provided in the Duke Energy letter dated June 5, 2017, were updated as described in Attachment 1. Attachment 2 provides a copy of the proposed TS changes.

In accordance with 10 CFR 50.91(b), HNP is providing the state of North Carolina with a copy of this response.

This letter does not contain any regulatory commitments.

U.S. Nuclear Regulatory Commission Serial HNP-18-002 Page 2 of 2 Should you have any questions regarding this submittal, please contact Jeff Robertson, Manager-Regulatory Affairs, at (919) 362-3137.

I declare under penalty of perjury that the foregoing is true and correct. Executed on January i *1,, 2018.

Sincerely, Tanya M. Hamilton Attachments:

1. Response to Request for Additional Information

2. Proposed Technical Specification Changes (Markup) cc:

J. Zeiler, NRC Sr. Resident Inspector, HNP W. L. Cox, 111, Section Chief, N.C. DHSR M. Barillas, NRC Project Manager, HNP NRC Regional Administrator, Region II

U.S. Nuclear Regulatory Commission Page 2 of 2 Serial HNP-18-002 Should you have any questions regarding this submittal, please contact Jeff Robertson, Manager - Regulatory Affairs, at (919) 362-3137.

I declare under penalty of perjury that the foregoing is true and correct. Executed on January, 2018.

Sincerely, Tanya M. Hamilton Attachments:

1. Response to Request for Additional Information

2. Proposed Technical Specification Changes (Markup) cc:

J. Zeiler, NRC Sr. Resident Inspector, HNP W. L. Cox, III, Section Chief, N.C. DHSR M. Barillas, NRC Project Manager, HNP NRC Regional Administrator, Region II

U.S. Nuclear Regulatory Commission Serial HNP-18-002 SERIAL HNP-18-002 ATTACHMENT 1 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION SHEARON HARRIS NUCLEAR POWER PLANT, UNIT 1 DOCKET NO. 50-400 RENEWED LICENSE NUMBER NPF-63

U.S. Nuclear Regulatory Commission Page 1 of 1 Serial HNP-18-002 By application dated June 5, 2017 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML17156A216), Duke Energy Progress, LLC (Duke Energy),

submitted a license amendment request (LAR) to change Shearon Harris Nuclear Power Plant, Unit 1 (HNP), Technical Specifications (TS) Surveillance Requirements (SRs) established for the Emergency Diesel Generators (EDGs). The Nuclear Regulatory Commission (NRC) staff reviewed the request and determined that additional information is needed to complete their review. Duke Energy provided a response to a request for additional information (RAI) from the NRC per letter dated November 27, 2017 (ADAMS Accession No. ML17331A354).

Subsequently, the NRC determined a second RAI is needed in order to complete their review.

Duke Energy received this second RAI from the NRC staff through electronic mail on December 7, 2017, with a required response date of January 22, 2018 (ADAMS Accession No. ML17360A013).

Duke Energy provides the following response to the RAI regarding the LAR. As described in the response, the proposed TS changes provided in the Duke Energy letter dated June 5, 2017, were updated and are provided in Attachment 2. There are no changes to the information provided in the significant hazards consideration within the LAR submitted on June 5, 2017, because of this RAI response.

EEOB RAI 1:

Section 2.0, Detail Description, of the license amendment request states:

SR 4.8.1.1.2.f.2 verifies that during shutdown, on a rejection of a load of greater than or equal to 1078 kilowatts (kW), the EDG will maintain a voltage of 6900 +/- 690 volts and frequency of 60

+/- 6.75 Hz [Hertz], with frequency stabilizing to 60 +/- 1.2 Hz within 10 seconds without any safety-related load tripping out or operating in a degraded condition. This SR is being revised to limit the frequency stabilizing value to 60 +/- 0.48 Hz within 10 seconds without any safety-related load tripping out or operating in a degraded condition.

The NRC staff notes that the proposed changes to SR 4.8.1.1.2.f.2 only change the frequency values and not the voltage values. SR 4.8.1.1.2.f.2 keeps plus or minus 10% of the nominal voltage (6900 +/- 690 volts) instead of the plus or minus 4% of the nominal EDG voltage (6900 +/- 276 volts), as proposed in the license amendment request.

Please provide a discussion addressing this discrepancy. In your discussion, provide a summary of the analysis that demonstrates the steady-state voltage values of plus or minus 10% of the nominal voltage (6900 +/- 690 volts) is acceptable to SR 4.8.1.1.2.f.2 while only the frequency is changed in the proposed revision to the SR.

HNP Response:

The existing SR 4.8.1.1.2.f.2 currently has a voltage limit of 6900 +/- 690 volts for the transient EDG voltage response following a rejection of a load of greater than or equal to 1078 kW. The change proposed to this SR in the LAR was to modify the frequency limit for the steady-state response achieved within 10 seconds. From additional consideration of the change to the EDG steady-state voltage limit and the impact to this SR, which now includes a voltage limit for steady-state conditions, Duke Energy has modified SR 4.8.1.1.2.f.2 to include the 6900 +/- 276 volts, as shown in the TS proposed changes (markup) contained in Attachment 2.

U.S. Nuclear Regulatory Commission Serial: HNP-18-002 SERIAL HNP-18-002 ATTACHMENT 2 PROPOSED TECHNICAL SPECIFICATION CHANGES (MARKUP)

SHEARON HARRIS NUCLEAR POWER PLANT, UNIT 1 DOCKET NO. 50-400 RENEWED LICENSE NUMBER NPF-63

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