ML13123A173

Request for Additional Information Regarding License Amendment Request to Revise Technical Specification Table 3.3-4 Degraded Voltage Time Delay Values

ML13123A173
Person / Time
Site:	Harris
Issue date:	05/07/2013
From:	Billoch-Colon A Plant Licensing Branch II
To:	Hamrick G Carolina Power & Light Co, Duke Energy Carolinas
Araceli Billoch-Colon, NRR/DORL
References
TAC ME9892
Download: ML13123A173 (4)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 May 7, 2013 George T. Hamrick, Vice President Shearon Harris Nuclear Power Plant 5413 Shearon Harris Rd New Hill, NC 27562-0165 SUB..IECT: SHEARON HARRIS NUCLEAR POWER PLANT, UNIT NO.1 - REQUEST FOR ADDITIONAL INFORMATION REGARDING LICENSE AMENDMENT REQUEST TO REVISE TECHNICAL SPECIFICATION TABLE 3.3-4 DEGRADED VOLTAGE TIME DELAY VALUES (TAC NO. ME9892)

Dear Mr. Hamrick:

By letter to the U.S. Nuclear Regulatory Commission (NRC) dated November 29, 2012 (Agencywide Document Access and Management System (ADAMS) Accession No. ML123350104), as supplemented by letter dated January 3,2013 (ADAMS Accession No. ML13003A214), Carolina Power & Light Company (the licensee), doing business as Duke Energy, Inc., submitted a license amendment request for Shearon Harris Nuclear Power Plant, Unit 1. The license amendment would revise Technical Specification (TS) Table 3.3-4 associated with 6.9 KiloVolt Emergency Bus Secondary Undervoltage time delay values to resolve a nonconservative TS.

The NRC staff is reviewing your submittal and has determined that additional information is required to complete the review. The specific information requested is addressed in the enclosure to this letter. During a discussion with your staff on May 1, 2013, it was agreed that you would provide a response 30 days from the date of this letter.

The NRC considers that timely responses to requests for additional information help ensure sufficient time is available for the NRC staff review and contribute toward the NRC's goal of efficient and effective use of staff resources.

Please contact me at (301) 415-3302, if you have any questions.

Sincerely, Araceli Billoch Colon, Project Manager Plant Licensing Branch 11-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-400

Enclosure:

Request for Additional Information cc w/encl: ListServ

REQUEST FOR ADDITIONAL INFORMATION REGARDING SHEARON HARRIS NUCLEAR POWER PLANT, UNIT 1 LICENSE AMENDMENT REQUEST TO REVISE TECHNICAL SPECIFICATION TABLE 3.3-4 DEGRADED VOLTAGE TIME DELAY VALUES DOCKET NO. 50-400 By letter dated November 29, 2012 (Agencywide Document Access and Management System (ADAMS) Accession No. ML123350104), as supplemented by letter dated January 3, 2013 (ADAMS Accession No. ML13003A214), Carolina Power & Light Company (the licensee),

doing business as Duke Energy, Inc., submitted a license amendment request for Shearon Harris Nuclear Power Plant, Unit 1, to revise Technical Specification (TS) Table 3.3-4 associated with 6.9 KiloVolt (kV) Emergency Bus Secondary Undervoltage time delay values to resolve a nonconservative TS. To complete its review, the U.S. Nuclear Regulatory Commission staff requests the following additional information.

1. Page 6 of Calculation No. E2-0005.09, states that the DGVR [Degraded Voltage Relay] control logic scheme is documented in Control Wiring Diagrams 6-B-401, Sheets 1711,1712,1731, and 1732.

Provide a copy of the above stated control wiring diagrams.

2. Page 8d of Calculation No. E2-0005.09, states the following:

"Attachment 0 contains timelines for various accident scenarios. These time lines were used to develop the analytical limit for the maximum time delay. The time lines incorporate logic changes and time delay changes expected to be made by EC 84101. The logic changes bypass the SAB 10 second time delay relay for a safety injection signal coincident with a degraded voltage signal (from the 'w SIAS' timer). The time delay change is for relay PGSA (PGSB) from 1.5 seconds to 2.5 seconds."

Provide a copy of the drawings that show the logic changes and time delay changes expected to be made by EC 84101.

3. Page 8d of Calculation No. E2-0005.09, states the following:

"Calculation E-6000, Tab A contains a graphical representation of 6.9kV safety bus voltage versus time for the safeguards sequencing transient with minimum switchyard voltage. The graph shows that the bus voltage decreases below the maximum dropout of the degraded voltage relay multiple times during the sequence, but recovers above the maximum reset value before the next load starts in all cases. n Enclosure

-2 Provide a copy of the graphical representation of 6.9kV safety bus voltage versus time for the safeguards sequencing transient. Also, provide a tabulation of the loads sequenced versus time whose voltage impact is provided in this graphical representation.

4. Provide a copy of the one-line diagram(s) of 6.9kV emergency buses that shows the connection of the degraded voltage relays and emergency load feeds from the 6.9kV emergency buses.

ML13003A214), Carolina Power & Light Company (the licensee), doing business as Duke Energy, Inc., submitted a license amendment request for Shearon Harris Nuclear Power Plant, Unit 1. The license amendment would revise Technical Specification (TS) Table 3.3-4 associated with 6.9 KiloVolt Emergency Bus Secondary Undervoltage time delay values to resolve a nonconservative TS.

The NRC staff is reviewing your submittal and has determined that additional information is required to complete the review. The specific information requested is addressed in the enclosure to this letter. During a discussion with your staff on May 1, 2013, it was agreed that you would provide a response 30 days from the date of this letter.

The NRC considers that timely responses to requests for additional information help ensure sufficient time is available for the NRC staff review and contribute toward the NRC's goal of efficient and effective use of staff resources.

Please contact me at (301) 415-3302, if you have any questions.

Sincerely, IRA!

Araceli Billoch Colon, Project Manager Plant Licensing Branch 11-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-400

Enclosure:

Request for Additional Information cc w/encl: ListServ DISTRIBUTION:

PUBLIC Lp12-2 RlF RidsNrrDorlLpl2-2 RidsNrrDorlDpr RidsNrrPMShearonHarris RidsNrrLABClayton RidsAcrsAcnw_MailCTR RidsNrrDeEeeb RidsRgn2MailCenter ADAMS Accession No.: ML13123A173 'By memo, as revised by email dated 04/24/13 i OFFICE LPL2-2/PM LPL2-2/LA DE/EEEB' LPL2-2/BC LPL2-2/PM NAME ABiliochColon BClayton RMathew JQuichocho ABillochColon DATE 05/06/13 05/06/13 04/24/13 05/07/13 05/07/13