Letter Sequence Draft RAI |
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MONTHYEARAEP-NRC-2009-18, License Amendment Request for Adoption TSTF-511, Revision 0, Eliminate Working Hour Restrictions from TS 5.2.2 to Support Compliance with 10 CFR Part 262009-03-19019 March 2009
License Amendment Request for Adoption TSTF-511, Revision 0, Eliminate Working Hour Restrictions from TS 5.2.2 to Support Compliance with 10 CFR Part 26
Project stage: Request
AEP-NRC-2009-25, Small Break Loss-of-Coolant Accident Evaluation Model Reanalysis2009-03-30030 March 2009
Small Break Loss-of-Coolant Accident Evaluation Model Reanalysis
Project stage: Request
ML0911700962009-04-27027 April 2009
E-mail Transmitting Acceptance Review of License Amendment Request Regarding Large Break Loss-of-Coolant Accident Analysis Methodology
Project stage: Acceptance Review
ML0919802662009-07-17017 July 2009
Draft RAIs for License Amendment Request Large Break Loss-of-Coolant Accident Methodology
Project stage: Draft RAI
ML0919802562009-07-17017 July 2009
E-mail Transmitting Draft Requests for Additional Information Large Break Loss-of-Coolant Accident License Amendment Request
Project stage: Draft RAI
ML0922400072009-08-11011 August 2009
E-mail Transmitting Revised Draft Requests for Additional Information Large Break LOCA License Amendment Request
Project stage: Draft RAI
ML0922400112009-08-11011 August 2009
Revised Draft Requests for Additional Information Associated with Large Break LOCA License Amendment Request
Project stage: Draft RAI
ML0926100292009-09-22022 September 2009
Request for Additional Information License Amendment Request Associated with Large Break LOCA Analysis Methodology
Project stage: RAI
AEP-NRC-2009-71, Response to Request for Additional Information Regarding a License Amendment Request Associated with the Large-Break Loss-of-Coolant Accident Analysis Methodology2009-11-20020 November 2009
Response to Request for Additional Information Regarding a License Amendment Request Associated with the Large-Break Loss-of-Coolant Accident Analysis Methodology
Project stage: Response to RAI
ML1000403272010-01-12012 January 2010
Request for Withholding Information from Public Disclosure
Project stage: Withholding Request Acceptance
ML1017302012010-06-21021 June 2010
Transmitting Draft RAI the Proposed Amendment Concerning Large-Break LOCA
Project stage: Draft RAI
ML1020305552010-07-22022 July 2010
Revised Draft RAI on Boron Precipitation Analysis for the Proposed Large-Break LOCA Amendment
Project stage: Draft RAI
ML1029400062010-10-20020 October 2010
Draft Questions Re Boric Acid Precipitation Analysis for the Proposed Large-Break LOCA Amendment
Project stage: Draft Approval
ML1030505662010-11-0101 November 2010
Draft Request for Additional Information Re. Downcomer Boiling for the Proposed LBLOCA Amendment
Project stage: Draft RAI
AEP-NRC-2011-15, Response to Second Request for Additional Information Regarding Amendment Request Associated with the Large-Break Loss-of-Coolant Accident Analysis Methodology2011-02-24024 February 2011
Response to Second Request for Additional Information Regarding Amendment Request Associated with the Large-Break Loss-of-Coolant Accident Analysis Methodology
Project stage: Request
ML1108101032011-03-11011 March 2011
Commitment to Perform Updated Boric Acid Precipitation Analysis for Recirculation Phase of a Postulated Large-Break Loss-Of-coolant Accident
Project stage: Other
AEP-NRC-2011-25, Change to Proposed Technical Specification Page Regarding Large-Break Loss-Of-Coolant Accident Analysis Approval2011-03-25025 March 2011
Change to Proposed Technical Specification Page Regarding Large-Break Loss-Of-Coolant Accident Analysis Approval
Project stage: Other
ML1107307832011-03-31031 March 2011
(CNP-2)-Issuance of Amendment No. 297 Re. Large-Break Loss-of-Coolant Accident Analysis
Project stage: Approval
ML11083A0332011-04-12012 April 2011
Withholding from Public Disclosure, Westinghouse Reports, D.C. Cook Unit 2 (AMP) Post-LOCA Responses to Request for Additional Information (Rai), & Supplemental Information to Support Informal NRC Audit of 12 .
Project stage: RAI
ML1114508892011-05-25025 May 2011
Changing a Schedule Conveyed by a Letter Dated 2/24/11 in Support of a Proposed Amendment Regarding the Large-break LOCA Analysis
Project stage: Approval
AEP-NRC-2011-41, Updated Boric Acid Precipitation Analysis for Recirculation Phase of a Postulated Large-Break Loss-of-Coolant Accident2011-06-30030 June 2011
Updated Boric Acid Precipitation Analysis for Recirculation Phase of a Postulated Large-Break Loss-of-Coolant Accident
Project stage: Other
ML11193A1462011-07-27027 July 2011
Determines That Submitted Information Dated 6/30/11 Is Proprietary and Is Withheld from Public Disclosure
Project stage: Other
ML1131202152011-11-0707 November 2011
Inform That TAC ME5865 Will Be Closed and the Issue of Lateral K Factor for LBLOCA Will No Longer Be Pursued Under D. C. Cook Unit 2 Docket
Project stage: Other
2010-06-21
[Table View] |
Draft Request for Additional Information Re. Downcomer Boiling for the Proposed LBLOCA Amendment| ML103050566 |
| Person / Time |
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| Site: |
Cook  |
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| Issue date: |
11/01/2010 |
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| From: |
Tam P
Plant Licensing Branch III |
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| To: |
Etheridge H, Huang T, Anthony Mendiola, Robert Pascarelli, Scarpello M, Ulses A, Ward L, Waters J
Indiana Michigan Power Co, Plant Licensing Branch III, NRC/NRR/DSS/SNPB, NRC/NRR/DSS/SRXB |
|---|
| Tam P |
| References |
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| TAC ME1017 |
| Download: ML103050566 (2) |
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Similar Documents at Cook |
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Text
Accession No. ML103050566 From:
Tam, Peter Sent:
Monday, November 01, 2010 1:32 PM To:
Helen Etheridge; Joe Waters (jrwaters@aep.com); mkscarpello@aep.com Cc:
Mendiola, Anthony; Huang, Tai; Pascarelli, Robert; Ulses, Anthony; Ward, Leonard
Subject:
D.C. Cook Unit 2 - Draft RAI re.downcomer boiling for the proposed LBLOCA amendment (TAC ME1017)
Helen::
The NRC staff completed its sensitivity study on downcomer boiling and the effect of lateral k-factor on this phenomenon. The case with zero lateral k-factor in the downcomer cross flow paths joining the azimuthal cells resulted in a 400 degrees F reduction in peak clad temperature. This was due to the maximization of mixing between the downcomer azimuthal cells which severely limited downcomer boiling. The cold water entering the downcomer during the long term readily mixed into the adjacent downcomer volumes and reduced boiling and the resulting core uncover and clad temperature. ECC bypass and liquid sweep-out that dominate the very early portion of the event (the first 100-200 seconds) does not prevail during the longer term when the downcomer fills with liquid and vapor velocities are no longer high enough to entrain and sweep out the injected liquid.
Based on these results, he NRC staff needs to request that an additional analysis of downcomer boiling be performed for D. C. Cook Unit 2 with the lateral k-facors based on Idelchik included in the downcomer resistance model in the WCOBRA/TRAC model. The additional comparative study should show the impact of the lateral k-factor on PCT during downcomer boiling following a large break LOCA.
If you so desire, the NRC staff will be ready to discuss with you in a conference call this information request.
Peter S. Tam, Senior Project Manager (for D.C. Cook and Monticello)
Plant Licensing Branch III-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Tel. 301-415-1451 E-mail Properties Mail Envelope Properties (0A64B42AAA8FD4418CE1EB5240A6FED1219553AC81)
Subject:
D.C. Cook Unit 2 - Draft RAI re.downcomer boiling for the proposed LBLOCA amendment (TAC ME1017)
Sent Date: 11/1/2010 1:32:12 PM Received Date: 11/1/2010 1:32:00 PM From: Tam, Peter Created By: Peter.Tam@nrc.gov Recipients:
hletheridge@aep.com (Helen Etheridge)
Tracking Status: None jrwaters@aep.com (Joe Waters (jrwaters@aep.com))
Tracking Status: None mkscarpello@aep.com (mkscarpello@aep.com)
Tracking Status: None Anthony.Mendiola@nrc.gov (Mendiola, Anthony)
Tracking Status: None Tai.Huang@nrc.gov (Huang, Tai)
Tracking Status: None Robert.Pascarelli@nrc.gov (Pascarelli, Robert)
Tracking Status: None Anthony.Ulses@nrc.gov (Ulses, Anthony)
Tracking Status: None Leonard.Ward@nrc.gov (Ward, Leonard)
Tracking Status: None Post Office:
HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 12461 11/1/2010 Options Expiration Date:
Priority: olImportanceNormal ReplyRequested: False Return Notification: False Sensitivity: olNormal Recipients received: