Letter Sequence Response to RAI |
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Initiation
- Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request
- Acceptance...
- Supplement, Supplement
Administration
- Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting, Meeting
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MONTHYEARML0506900352005-03-0303 March 2005
Response to NRC Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized-Water Reactors
Project stage: Request
ML0515100172005-05-31031 May 2005
Draft RAI on Response to Generic Letter 2004-02
Project stage: Draft RAI
ML0515303042005-06-0303 June 2005
6/3/05, Calvert Cliffs - RAI Potential Impact of Debris Blockage on Emergency Sump Recirculation at Pressurized-Water Reactors
Project stage: RAI
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Response to NRC Request for Additional Information Re NRC Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized-Water Reactors
Project stage: Response to RAI
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Approval of Extension Request for Completion of Corrective Actions in Response to Generic Letter 2004-02
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Update of Response to Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Basis Accidents at Pressurized Water Reactors
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Update of Response to Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized-Water Reactors
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Unit No.1 - Approval of Extension Request for Completion of Corrective Action in Response to Generic Letter 2004-02
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Revision to Generic Letter 2004-02 Response
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ML0734504992007-12-10010 December 2007
Attachment (1) Request for Extension of the Completion Date for Corrective Actions Related to Generic Letter 2004-02
Project stage: Request
ML0734504982007-12-10010 December 2007
Request for Extension for Completion of Activities Related to Generic Letter 2004-02
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Revision to Generic Letter 2004-02 Response
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ML0817101052008-06-18018 June 2008
Attachment 1, Request for Extension of the Completion Date for Corrective Actions Related to Generic Letter 2004-02
Project stage: Request
ML0827404892008-09-30030 September 2008
Supplemental Response to Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized Water Reactors
Project stage: Supplement
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Attachment 2, ECCS and CS System Figures
Project stage: Other
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Request for Additional Information Supplemental Response to Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized Water Reactors-Calvert Cliffs Unit 1 & 2
Project stage: RAI
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Request for Additional Information: Supplemental Response to Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized Water Reactors
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Request for Additional Information Generic Letter 2004-02 Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2-
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Notice of Forthcoming Conference Call with Calvert Cliffs to Discuss Supplemental Responses to Generic Ltr. 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized Water Reactors
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Summary of Meeting with Calvert Cliffs Nuclear Power Plant, LLC, to Discuss Supplement to Responses to Generic Letter 2004-02
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Draft Responses to NRC Request for Additional Information Related to Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents on Pressurized-Water..
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Notice of Forthcoming Conference Call with Duke Energy Carolinas, LLC Regarding McGuire Nuclear Station, Units 1 and 2 and Catawba Nuclear Station, Units 1 and 2,
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Summary of November 1, 2010, Meeting with Duke to Discuss Responses to Generic Letter (GL) 2004-02 (Tac Nos. MC4673, MC4674, MC4692, and MC4693)
Project stage: Meeting
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Response to Request for Additional Information Regarding Generic Letter 2004-02
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January 8, 2013 - Notice of Teleconference with Calvert Cliffs Nuclear Power Plant, LLC
Project stage: Meeting
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Chemical Effects Head Loss Experiment (Chle) Test Protocol for Calvert Cliffs Nuclear Power Plant (CCNPP-CHLE-002, Revision 0d)
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PIRT Item Summary
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CCNPP-CHLE-001, Revision 0c, Chemical Effects Head Loss Experiment (Chle) Test Plan for Calvert Cliffs Nuclear Power Plant
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Chemical Effects Pirt Considerations for Calvert Cliffs Nuclear Power Plant (CCNPP-CHLE-003, Revision 0b)
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MC4672 & MC4673 - CCNPP-CHLE-003, Rev 0c Chemical Effects PIRT Considerations Excerpts with Respect to GL2004-02, GSI-191
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March 20, 2013, Notice of Forthcoming Teleconference with Calvert Cliffs and Nrc/Nrr Staff to Have Additional Discussions of Licenseess Proposed Path for Resolution of Generic Letter 2004-02
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MC4672-3 Corrected Notice -Public Meeting on March 20, 2013 Re-GL2004-02
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MC4672 & MC4673, CCNPP-CHLE-002, Rev 0e Chemical Effects Experimental Protocol with Respect to GL2004-02, GSI-191
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MC4672 & MC4673 - CCNPP-CHLE-005, Rev 1 Chemical Effects Autoclave Experimental Plan with Respect to GL2004-02, GSI-1 91
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MC4672 & MC4673 - Licensee Presentation-Category 1, Public Meeting on March 20, 2013 with Respect to GL2004-02, GSI-191
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Chemical Effects PIRT Considerations for Calvert Cliffs Nuclear Power Plant, CCNPP-CHLE-003, Revision 0c
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CCNPP-CHLE-007, Revision 0c, Coatings Bench-Top Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant
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Ri GSI-191 November 2013 Meeting with NRC Rev 0
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Summary of Meeting with Constellation Energy Group, Inc., to Continue Discussions on the Proposed Risk-Informed Approach to the Resolution of Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During .
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Summary of Meeting with Constellation Energy Group, Inc., to Continue Discussions on the Proposed Risk-Informed Approach to the Resolution of Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During
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2010-06-07
[Table View] |
Text
George H. Gellrich Vice President Calvert Cliffs Nuclear Power Plant, LLC 1650 Calvert Cliffs Parkway Lusby, Maryland 20657 410.495.5200 410.495.3500 Fax CENG a joint venture of A% Constellatinon
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CALVERT CLIFFS NUCLEAR POWER PLANT November 10, 2010 U. S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:
SUBJECT:
Document Control Desk Calvert Cliffs Nuclear Power Plant Unit Nos. 1 & 2; Docket Nos. 50-317 & 50-318 Update to Request for Additional Information Response Regarding Generic Letter 2004-02 (TAC Nos. MC4672 and MC4673)
(a)
Letter from G. H. Gellrich (CCNPP) to Document Control Desk (NRC),
dated July 23, 2010, Request for Additional Information Regarding Generic Letter 2004-02
REFERENCES:
(b)
Letter from D. V. Pickett (NRC) to G. H. Gellrich (CCNPP), dated April 12, 2010, Request for Additional Information re: Generic Letter 2004-02 Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2 - (TAC Nos. MC4672 and MC4673)
In Reference (a), we provided responses to an information request from the Nuclear Regulatory Commission (NRC) (Reference b). Subsequent to our submittal, the NRC has requested clarification regarding our response to Request for Additional Information (RAI) 21.
Our clarification is provided below.
Based on our response to RAI 21 regarding sump level calculation methodology, the NRC staff indicates that they could not conclude that the calculation was performed such that a realistic or conservative estimate of sump level would result. Specifically, the calculation did not account for holdups including water droplets in transit from the spray nozzles, holdups on vertical surfaces due to condensation, holdups on horizontal surfaces, or shrinkage of water volume due to Reactor Coolant System inventory cooling.
Instead the calculation uses a 1/16 inch holdup across the containment cross-section. The NRC staff does not find this 1/16 inch allowance to adequately account for the potential holdups listed above.
However, the NRC staff accepts that our plan to increase water level in the sump would, if successful, offset any potential non-conservatism in the calculation. Without further consideration of an appropriate
4" Document Control Desk November 10, 2010 Page 2 water holdup in the water level calculation, the NRC staff has indicated that our use of the planned increased sump water level in the net positive suction head calculation would not be acceptably conservative.
To ensure this offset (between sump water level and water holdup in Containment) remains valid, we are revising the sump water level calculation to include appropriate water holdups. This will allow any sump water level increases realized from other modifications to be used in the net positive suction head calculation because of the conservative nature of the sump water level calculation.
Should you have questions regarding this matter, please contact Mr. Douglas E. Lauver at (410) 495-5219.
Very truly yours, STATE OF MARYLAND COUNTY OF CALVERT
- TO WIT:
I, George H. Gellrich, being duly sworn, state that I am Vice President - Calvert Cliffs Nuclear Power Plant, LLC (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 I believe it to be reliable.
and suvorn before me, a Notary,?jblic ip and for the State of Maryland and County of 4
/
1, this/O11 day of 0I1,r*
, 2010.
Notarial Seal:
Date GHG/PSF/bjd cc:
D. V. Pickett, NRC W. M. Dean, NRC Resident Inspector, NRC S. Gray, DNR
