ML073450498

Request for Extension for Completion of Activities Related to Generic Letter 2004-02

ML073450498
Person / Time
Site:	Calvert Cliffs
Issue date:	12/10/2007
From:	Bauder D R Constellation Energy Group
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
GL-04-002, TAC MC4672, TAC MC4673
Download: ML073450498 (3)

Text

Calvert Cliffs Nuclear Power Plant 0**:.Co tellatio ergy'..'Nuclear Generation Group U.S.Nuclear Regulatory Commission Washington, DC 20555 1650 Calvert Cliffs Parkway Lusby, Maryland 20657 December 10, 2007 ATTENTION:

REFERENCES:

Document Control Desk Calvert Cliffs Nuclear Power Plant Unit Nos.1&2;Docket Nos.50-317&50-318 Request for Extension for Completion of Activities Related to Generic Letter 2004-02 (a)Letter from G.Vanderheyden (CCNPP)to Document Control Desk (NRC), dated March 3, 2005, Response to NRC Generic Letter 2004-02,"Potential Impact of Debris Blockage on Emergency Recirculation during Design Basis Accidents at Pressurized-Water Reactors" (b)Letter from J.A.Spina (CCNPP)to Document Control Desk (NRC), dated September 20, 2006, Update of Response to Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized-Water Reactors (T AC Nos.MC4672 and MC4673)(c)Letter from P.D.Milano (NRC)to J.A.Spina (CCNPP), dated December 18, 2006, Calvert Cliffs Nuclear Power Plant, Unit No.1 Approval of Extension Request for Completion of Corrective Actions in Response to Generic Letter 2004-02 (TAC Nos.MC4672)In Reference (a), Calvert Cliffs Nuclear Power Plant Inc.(Calvert Cliffs)submitted a response to NRC Generic Letter (GL)2004-02,"Potential Impact of Debris Blockage on Emergency Recirculation during Design Basis Accidents at Pressurized-Water Reactors." In that letter, Calvert Cliffs committed to completing corrective actions required by GL 2004-02 to resolve Nuclear Regulatory Commission (NRC)Generic Safety Issue (GSI)191,"Assessment of Debris Accumulation on PWR Sump Performance," by December 31, 2007 for Unit 2 and requested an extension for Unit I.In a subsequent letter (Reference b)Calvert Cliffs modified the extension request for Unit I to permit the completion of the installation of the passive containment sump strainer system during the spring 2008 refueling outage.The NRC approved the Unit I extension request in Reference (c).Calvert Cliffs is fully committed to ensuring that GSI-191 is completely and thoroughly resolved.This is evidenced by the significant amount of work that has been completed to date to address the sump performance concern, including the installation of passive strainers on Unit 2 to substantially increase the available strainer surface area.However, it has recently become evident that certain required activities Document Control Desk December 10, 2007 Page 2 cannot be completed by the December 31, 2007 due date for Unit 2 or the spring 2008 refueling outage for Unit 1.Attachment (1)provides the bases for the proposed extensions of the corrective action completion dates required by GL 2004-02 for Units 1 and 2.The extension basis provides adequate assurance that safe continued operation during the requested extension period is maintained.

Calvert Cliffs Units I and 2 currently meet, and will continue to meet during the period of the requested extensions, the current plant licensing bases regarding the function and operability of the containment sump.As a result of the remaining required activities discussed in Attachment (1), an extension to June 30, 2008 is requested for Calvert Cliffs Units 1 and 2 to complete the GL 2004-02 corrective actions.Should you have questions regarding this matter, please contact Mr.Jay S.Gaines at (410)495-5219.STATE OF MARYLAND TO WIT: COUNTY OF CALVERT I, Douglas R.Bauder, being duly sworn, state that I am Plant General Manager-Calvert Cliffs Nuclear Power Plant, Inc.(CCNPP), and that I am duly authorized to execute and file this response on behalf of CCNPP.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 CCNPP employees and/or consultants.

Such information has been reviewed in accordance with company practice and[

Subscribed and sworn before me, a Notary Public inandfor the State of Maryland and County of Co.-I

, thisday of:DecembeR ,2007.WITNESS my Hand and Notarial Seal: My Commission Expires: DRB/PSF/bjd

Attachment:

(1)Request for Extension of the Completion Date for Corrective Actions Related to Generic Letter 2004-02 Document Control Desk December 10, 2007 Page 3 cc: D.V.Pickett, NRC S.J.Collins, NRC Resident Inspector, NRC R.I.McLean, DNR