ML093631558

Nine Mine Point, Unit 2, Supplemental Response to Generic Letter 2008-01, Managing Gas Accumulation in Emergency Core Cooling, Decay Heat Removal, and Containment Spray Systems.

ML093631558
Person / Time
Site:	Nine Mile Point
Issue date:	12/14/2009
From:	Lynch T A Constellation Energy Group, EDF Group
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
GL-08-001
Download: ML093631558 (5)

Text

ps.Thomas A. Lynch Plant General Manager CENG a joint venture of Consktegetrtm 1;nleD Nine Mile Point Nuclear Station U. S. Nuclear Regulatory Commission Washington, DC 20555-0001 P.O. Box 63 Lycoming, New York 13093 315-349-5205 315-349-1321 Fax December 14, 2009 ATTENTION:

SUBJECT:

Document Control Desk Nine Mile Point Nuclear Station, LLC Unit No. 2; Docket No. 50-410 Supplemental Response to Generic Letter Accumulation in Emergency Core Cooling, Containment Spray Systems" 2008-01, "Managing Gas Decay Heat Removal, and

REFERENCES:

(a) NRC Generic Letter 2008-01, dated January 11, 2008, "Managing Gas Accumulation in Emergency Core Cooling, Decay Heat Removal, and Containment Spray Systems" (b) Letter from R. V. Guzman (NRC) to K. J. Poison (NMPNS), dated September 17, 2008, "Nine Mile Point Nuclear Station, Unit No. I -Re: 'Managing Gas Accumulation in Emergency Core Cooling, Decay Heat Removal, and Containment Spray Systems,'

Proposed Alternative Course of Action (TAC No. MD7848)" (c) Letter from K. J. Poison (NMPNS) to Document Control Desk (NRC), dated October 14, 2008, "Nine Month Response to NRC Generic Letter 2008-01, 'Managing Gas Accumulation in Emergency Core Cooling, Decay Heat Removal, and Containment Spray Systems"'(d) Letter from S. Belcher (NMPNS) to Document Control Desk (NRC), dated July 6, 2009, "Supplemental Response to NRC Generic Letter 2008-01,'Managing Gas Accumulation in Emergency Core Cooling, Decay Heat Removal, and Containment Spray Systems"'The NRC issued Generic Letter (GL) 2008-01 (Reference a) to request that each licensee evaluate the licensing basis, design, testing, and corrective action programs for the Emergency Core Cooling Systems, Residual Heat Removal System, and Containment Spray System, to ensure that gas accumulation is maintained less than the amount that challenges operability of these systems, and that appropriate action is taken when conditions adverse to quality are identified.

I/ m, Document Control Desk December 14, 2009 Page 2 As requested in Reference (b), Nine Mile Point Nuclear Station, LLC (NMPNS) provided a nine month response dated October 14, 2008 (Reference c) with a supplemental response dated July 6, 2009 (Reference d). In the July 6, 2009 supplement, the following commitments were made regarding the Low Pressure Core Spray System (CSL) and the Residual Heat Removal System (RHS): 1. NMPNS will evaluate the cause of the voiding in the NMP2 CSL and RHS systems and determine what design changes, if any, will be required.

The required design changes will be implemented by the end of the spring 2010 refuel outage.2. NMPNS will send a supplemental response to the NRC by December 15, 2009 informing them of the design changes that will be implemented to minimize the voiding of CSL and RHS piping and the completion dates, if any.The response to these commitments is as follows: The voids in the suction lines of the Nine Mile Point Unit 2 (NMP2) RHS pump C and the CSL pump have been determined to be gas coming out of solution downstream of the orifices found in the "Keep Fill" pump recirculation lines. The original source of the gas in the voids is nitrogen from the suppression pool. The "Keep Fill" pump recirculation discharge lines will be re-routed back to the suppression pool instead of the suction line of the main pumps. This would allow any nitrogen degassed at the orifice to return to the atmosphere above the suppression pool and would eliminate voids from forming in the suction lines to the RHS and CSL pumps from this source. The modifications will be implemented in the next refueling outage for NMP2 in the spring of 2010. The satisfactory completion of this modification will be confirmed in a supplemental letter within 60 days following the startup from the NMP2 spring 2010 refueling outage.The attachment to this letter contains a listing of regulatory commitments made in this document.Should you have any questions regarding this submittal, please contact T. F. Syrell, Licensing Director, at (315) 349-5219.Very truly yours, Document Control Desk December 14, 2009 Page 3 STATE OF NEW YORK TO WIT: COUNTY OF OSWEGO I, Thomas A. Lynch, being duly sworn, state that I am Plant General Manager, and that I am duly authorized to execute and file this response on behalf of Nine Mile Point Nuclear Station, LLC. To the best of my knowledge and belief, the statements contained in this document are true and correct. To the extent that these statements are not based on my personal knowledge, they are based upon information provided by other Nine Mile Point employees and/or consultants.

Such information has been reviewed in accordance with company practice and I believe it to be reliable.Subscribed and sworn before i~e, a Notary Publip in and for the State of New York and County of,this I I-day ofi-me _.'- 2009.WITNESS my Hand and Notarial Seal: My Commission Expires: ,Ia Ic.Elate* --/Notary Pblic" TONYA LONES Notary Public in the State of New York Oswego County Reg. No. 01 1 JO6SP83 4 My Comiission Expires i41 -1Io/J0 TAL/RJC

Attachment:

List of Regulatory Commitments cc: R. V. Guzman, NRC Project Manager S. J. Collins, NRC Regional Administrator, Region I NRC Resident Inspector ATTACHMENT LIST OF REGULATORY COMMITMENTS Nine Mile Point Nuclear Station, LLC December 14,2009 ATTACHMENT LIST OF REGULATORY COMMITMENTS List of Regulatory Commitments The following table identifies actions committed to in this document by Nine Mile Point Nuclear Station, LLC (NMPNS). Any other statements in this submittal are provided for informationpurposes and are not considered to be regulatory commitments.

Direct questions regarding these commitments to T. F. Syrell, Licensing Director, at (315) 349-5219.REGULATORY COMMITMENT DUE DATE NMPNS will implement the design changes to minimize voiding in the Low Pressure Core Spray End of Spring 2010 Refueling Outage System (CSL) and Residual Heat Removal System (RHS) at Nine Mile Point Unit 2 (NMP2).NMPNS will send a supplemental response to the NRC within 60 days following the startup from the Within 60 days following the startup from the NMP2 spring 2010 refueling outage to confirm NMP2 spring 2010 Refueling Outage installation of design changes to minimize voiding in the CSL and RHS systems at NMP2.1 of 1