ML120600459

Request for Additional Information Diesel Generator Technical Specification Surveillance Requirement 3.8.1.11 - Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2

ML120600459
Person / Time
Site:	Calvert Cliffs
Issue date:	03/08/2012
From:	Pickett D Plant Licensing Branch 1
To:	George Gellrich Calvert Cliffs
pickett , NRR/DORL, 415-1364
References
TAC ME6831, TAC ME6832
Download: ML120600459 (3)

Text

..,.11 REG(f~

,;:,(,'1,; "/~

UNITED STATES

-iI' 01' NUCLEAR REGULATORY COMMISSION

~

~0 WASHINGTON, D.C. 20555-0001 In  :

~ ~

~

'S-'l ~O t-' March 8, 2012

• • • • i' 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:

REQUEST FOR ADDITIONAL INFORMATION RE: DIESEL GENERATOR TECHNICAL SPECIFICATION SURVEILLANCE REQUIREMENT 3.8.1.11 CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NOS. 1 AND 2 (TAC NOS.

ME6831 AND ME6832)

Dear Mr. Gellrich:

By letter dated January 11, 2012, Calvert Cliffs Nuclear Power Plant, LLC responded to a request for additional information (RAI) regarding a proposed revision to technical specification (TS) surveillance requirement 3.8.1.11. The proposed TS change would revise the required power factors to be achieved by the diesel generators during conduct of the surveillance tests.

The Nuclear Regulatory Commission staff has concluded that additional information will be required in order to continue its review. As discussed with your staff, we understand that you intend to respond to the enclosed RAI within 60 days of the date of this letter. We also understand that this date may require adjustment due to the ongoing refueling outage at Unit NO.1.

Please contact me at 301-415-1364 if you have any questions.

Sincerely, Douglas V. Pickett, Senior 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:

As stated cc w/encl: Distribution via Listserv

REQUEST FOR ADDITIONAL INFORMATION CALVERT CLIFFS NUCLEAR POWER PLANT. UNIT NOS. 1 AND 2 DOCKET NOS. 50-317 AND 50-318 DIESEL GENERATOR SURVEILLANCE REQUIREMENT 3.8.1.11 The NRC staff has reviewed the information provided in the licensee's letter dated January 11.

2012 (Agencywide Documents Access and Management System Accession No. ML12012A218). The staff needs the following additional information with regard to the Calvert Cliffs Nuclear Power Plant (CCNPP) Response #1.

The CCNPP Updated Final Safety Analysis Report Chapter 8.0 provides the design basis of the electrical system and states that CCNPP has four safety-related emergency diesel generators (EDGs), two dedicated to each unit. Any combination of two of the EDGs (one from each unit) is capable of supplying sufficient power for the operation of necessary engineered safety feature loads during accident conditions on one unit and shutdown loads of the alternate unit concurrent with a loss of offsite power, and for the safe and orderly shutdown of both units under loss of offsite power conditions.

(a) Confirm that the worst case EDG loading is accounted for in the highest values provided for various design basis scenarios identified in CCNPP Response #1.

(b) Provide the impact on EDG loading (real and reactive power) due to voltage variation that is allowed per technical specification (TS) surveillance requirements (SRs).

(c) According to SR 3.8.1.11, EDG 28 is tested at ;;:: 3000 kiloWatts (kW). However, the

=

worst case large-break loss-of-coolant accident loading can be 2911 x 1.06 3085.7 kW after taking into account TS allowed frequency variation of plus 1.2 Hz. Justify why the EDG load test values do not take into account the potential higher loading as a consequence of allowed TS frequency variation.

(d) The CCNPP Response #1 indicates that plant procedures provide guidance for operations personnel to manually add loads to the operating EDG(s). Provide details on guidance and limitations provided to plant operators to load the EDGs during plant emergencies. Validate that the proposed surveillance testing will envelop the worst case postulated loading taking into account all operator actions.

Enclosure

March 8, 2012 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: REQUEST FOR ADDITIONAL INFORMATION RE: DIESEL GENERATOR TECHNICAL SPECIFICATION SURVEILLANCE REQUIREMENT 3.8.1.11 CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NOS. 1 AND 2 (TAC NOS.

ME6831 AND ME6832)

Dear Mr. Gellrich:

By letter dated January 11, 2012, Calvert Cliffs Nuclear Power Plant, LLC responded to a request for additional information (RAI) regarding a proposed revision to technical specification (TS) surveillance requirement 3.8.1.11. The proposed TS change would revise the required power factors to be achieved by the diesel generators during conduct of the surveillance tests.

The Nuclear Regulatory Commission staff has concluded that additional information will be required in order to continue its review. As discussed with your staff, we understand that you intend to respond to the enclosed RAI within 60 days of the date of this letter. We also understand that this date may require adjustment due to the ongoing refueling outage at Unit NO.1.

Please contact me at 301-415-1364 if you have any questions.

Sincerely, IRA!

Douglas V. Pickett, Senior 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:

As stated cc w/encl: Distribution via Listserv DISTRIBUTION:

PUBLIC LPL1-1 rlf RidsNrrDorlLpL 1-1 RidsNrrPMCalvertCliffs VGoel, NRR RidsNrrDeEeeb RidsOgcMailCenter RidsNrrLASLittle RidsAcrsAcnwMailCenter RidsRegion 1MailCenter GDentel, R1 GMatharu, NRR ADAMS ACCESSION NO- ML120600459 OFFICE NAME LPL1-1/PM DPickett 03nt12 LPL1-1/LA SUttle 03nt12 EEEBIBC JAndersen 02/08/12

==i LPL1-1/BC GWilson 03/8/12 DATE  :

OFFICIAL RECORDS COpy