ML13155A412

Request for Additional Information Regarding Enhancements to Diesel Generator Surveillance Requirements License Amendment

ML13155A412
Person / Time
Site:	Calvert Cliffs
Issue date:	06/12/2013
From:	Nadiyah Morgan Plant Licensing Branch 1
To:	George Gellrich Calvert Cliffs
Morgan N
References
TAC ME9832, TAC ME9833
Download: ML13155A412 (4)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 June 12, 2013 Mr. George H. Gellrich, Vice President Calvert Cliffs Nuclear Power Plant, LLC Calvert Cliffs Nuclear Power Plant 1650 Calvert Cliffs Parkway Lusby, MD 20657-4702 SUB..IECT: CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NOS. 1 AND 2 REQUEST FOR ADDITIONAL INFORMATION REGARDING ENHANCEMENTS TO DIESEL GENERATOR SURVEILLANCE REQUIREMENTS LICENSE AMENDMENT (TAC NO. ME9832 AND ME9833)

Dear Mr. Gellrich:

By letter dated October 16, 2012, Calvert Cliffs Nuclear Power Plant, LLC, the licensee, submitted a license amendment request to revise Surveillance Requirements (SRs) 3.8.1.8, 3.8.1.11, and 3.8.2.1, and add SR 3.8.1.17 of Technical Specification 3.8.1, <lAC Sources Operating," for Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2.

The NRC staff is reviewing the submittal and has determined that additional information is needed to complete its review. The specific questions are found in the enclosed request for additional information (RAI). The NRC staff is requesting a response to the RAI within 30 days of the date of this letter.

If you have any questions regarding this issue, please contact me at (301) 415-1016.

Sinc~,ly,

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""adiyah S. Morgan, Project Manager Plant Licensing Branch 1-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-317 and 50-318

Enclosure:

RAI cc w/encl: Distribution via Listserv

REQUEST FOR ADDITIONAL INFORMATION REGARDING ENHANCEMENTS TO DIESEL GENERATOR SURVELLANCE REQUIREMENTS LICENSE AMENDMENT REQUEST CALVERT CLIFFS NUCLEAR POWER PLANT, LLC.

CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NOS. 1 AND 2 DOCKET NOS. 50-317 AND 50-318 By letter dated October 16, 2012 (Agencywide Documents Access and Management System Accession No. ML122910955), Calvert Cliffs Nuclear Power Plant, LLC, the licensee, submitted a license amendment request (LAR) to revise Surveillance Requirements (SRs) 3.8.1.8, 3.8.1.11, and 3.8.2.1, and add SR 3.8.1.17 of Technical Specification (TS) 3.8.1, "AC Sources Operating," for Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2 (Calvert Cliffs). In order to complete its review, the Nuclear Regulatory Commission (NRC) staff requests the following information:

1. On Page 2 of Attachment 1 of the LAR, in regards to SR 3.8.1.8, the licensee stated that the loads under accident and loss of offsite power (LOOP) conditions are sequentially connected to the bus by automatic load sequencers.

Provide a description of the automatic load sequencers with details such as, the number of sequencers provided per diesel generator (DG) or per safety-related bus and logic diagrams of the sequencers. Also, provide a table of load sequencing for the LOOP conditions for each DG (similar to Table 8-7 for accident conditions in the Calvert Cliffs Updated Final Safety Analysis Report).

2. In regards to SR 3.8.1.8, provide details of any load sequence times outside of the 10%

time interval tolerance, Which might have occurred during last 5 years.

3. On page 3 of Attachment 1 of the LAR, in regards to SR 3.8.1.11, the licensee stated, "To perform this surveillance test at the most limiting power factor, the voltage regulators must be placed in the manual mode of operation. This operational mode means that the safety bus voltage now tracks with the grid voltage swings. This places equipment at greater risk for being impacted by degraded grid voltage for the duration of the surveillance test. Currently, the surveillance test is one hour in duration and the exposure time with the voltage regulators in manual is minimal. With the change to a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> surveillance test, the exposure time with the voltage regulators in manual is significant. The probability of a grid voltage swing is increased in a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period. It is not an optimum testing practice. Therefore, we propose to change the SR by removing the power factor numbers and the associated Note 2. The surveillance testing will be conducted at the required loads for a total of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> at the worst case power factor Enclosure

-2 achievable with the voltage regulators in automatic mode. The achievable power factor will depend on the grid conditions during the surveillance test but is expected to be approximately 0.9."

Regarding the above statements, please provide the following information:

(a) Explain why the voltage regulator needs to be in the manual mode in order to reduce the equipment risk during the surveillance test. Provide catalog cut/operational details of the voltage regulator.

(b) Explain whether the surveillance test can be performed at the power factor limits during the 2-hour period by keeping the voltage regulators in manual mode of operation, so as to limit the equipment risk to any degraded grid voltage. If yes, provide details of power factor test limits corresponding to the kilo-watts (kW) loading during the 2-hour test period.

4. On page 3 of Attachment 1 of the LAR, the licensee described the kW loading requirements for the DG for SR 3.8.1.11. Provide a summary of the loading calculations for each DG for both accident and LOOP conditions.

5. The proposed changes to SR 3.8.1.11 relating to the 2-hour and 22-hour tests, states that, "These test phases may be performed in either order."

Explain how performing the 2-hour test after the 22-hour test demonstrates the capability of the DG to perform its design function.

6. Provide the operating modes of the plant that the newly proposed SR 3.8.1.17 will be permitted to be performed.

7. According to the Standard Technical Specification (STS), NUREG-1432, Revision 4, in Section 3.8.2, "AC Sources - Shutdown," SR 3.8.2.1; SR 3.8.1.11 (equivalent to the newly proposed SR 3.8.1.17) is not in the list of SRs which are not applicable, but rather is in the list of SRs in the "NOTE," which are not required to be performed. The NRC staff finds that the exemption for not performing the newly proposed SR 3.8.1.17 should be covered in the "NOTE."

Please explain the deviation from the STS.

June 12, 2013 Mr. George H. Gellrich, Vice President Calvert Cliffs Nuclear Power Plant, LLC Calvert Cliffs Nuclear Power Plant 1650 Calvert Cliffs Parkway Lusby, MD 20657-4702

SUBJECT:

CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NOS. 1 AND 2 REQUEST FOR ADDITIONAL INFORMATION REGARDING ADOPTION OF TSTF-501-A, REVISION 1, "RELOCATE STORED FUEL OIL AND LUBE OIL VOLUME VALUES TO LICENSEE CONTROL" LICENSE AMENDMENT (TAC NO. ME9794 AND ME9795)

Dear Mr. Gellrich:

By letter dated October 16,2012, Calvert Cliffs Nuclear Power Plant, LLC, the licensee, submitted a license amendment request to revise Surveillance Requirements (SRs) 3.8.1.8, 3.8.1.11, and 3.8.2.1, and add SR 3.8.1.17 of Technical Specification 3.8.1, "AC Sources Operating," for Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2.

The NRC staff is reviewing the submittal and has determined that additional information is needed to complete its review. The specific questions are found in the enclosed request for additional information (RAI). The NRC staff is requesting a response to the RAJ within 30 days of the date of this Jetter.

If you have any questions regarding this issue, please contact me at (301) 415-1016.

Sincerely, IRA!

Nadiyah S. Morgan, Project Manager Plant Licensing Branch 1-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-317 and 50-318

Enclosure:

RAI cc w/encl: Distribution via Listserv DISTRIBUTIOI\I; PUBLIC RidsNrrDorlLpl1-1 RidsNrrPMCalvertCliffs LPL 1-1 R/F RidsNrrLAKGoldstein RidsAcrsAcnw_MailCenter RidsNrrDorlDpr RidsRgn1 MailCenter SBasturescu, NRR RidsNrrDeEeeb ADAMS Accession No: ML13155A412 *See dated memo May 22,2013 **via email OFFICE LPLI-1/PM LPLI-1/LA** DE/EEEB/BC (A)* LPLI-1/BC (A)

KGoldstein NAME NMorgan (ABaxter for) RMathew RBeali DATE 06/06/13 06/06/13 05/22/13 06/12113 OFFICIAL RECORDS COPY