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MONTHYEARML0525601182005-08-26026 August 2005
Draft RAI Re. Proposed Amendment on Alternative Source Term
Project stage: Draft RAI
ML0530704602005-11-0202 November 2005
E-mail from Suzanne Leta (Njpirg) Regarding Barnegat Bay Resources (Near OCNGS)
Project stage: Request
ML0531203762005-11-0202 November 2005
Response to Request for Additional Information - License Amendment Request No. 315, Application of Alternative Source Term. (Non-Proprietary Version)
Project stage: Response to RAI
ML0531203242005-12-0505 December 2005
Amergen Energy Company LLC, Request for Withholding Information from Public Disclosure for Oyster Creek Generating Station
Project stage: Withholding Request Acceptance
ML0633204782006-11-28028 November 2006
E-mail, Miller, NRR, to Distel, Exelon, Draft Request for Additional Information, Oyster Creek AST LAR
Project stage: Draft RAI
ML0633302152006-12-19019 December 2006
RAI, License Amendment Request for Application of the Alternate Source Term Methodology
Project stage: RAI
ML0634501852006-12-21021 December 2006
Summary of Meeting with Amergen Energy Company, LL, to Discuss Alternative Source Term License Amendment Request
Project stage: Meeting
ML0703101012007-01-24024 January 2007
Response to Request for Additional Information - License Amendment Request No. 315, Application of Alternative Source Term
Project stage: Response to RAI
ML0703603302007-02-0202 February 2007
Response to Request for Additional Information - License Amendment Request No. 315, Application of Alternative Source Term
Project stage: Response to RAI
ML0705204592007-02-0909 February 2007
E-mail, Miller, NRR, to Distel, Exelon, Oyster Creek AST
Project stage: Other
ML0708508202007-03-15015 March 2007
Calculation No. C-1302-826-E310-018, Revision 0, Oyster Creek Offsite Atmospheric Dispersion (X/Q) for Alternative Source Terms (Ast)
Project stage: Other
ML0708508162007-03-16016 March 2007
Additional Information - License Amendment Request No. 315, Application of Alternative Source Term
Project stage: Request
ML0706505142007-03-21021 March 2007
Clarification of Response to Request for Additional Information Regarding License Amendment Request for Application of the Alternate Source Term Methodology
Project stage: RAI
ML0709200672007-03-23023 March 2007
Additional Information - License Amendment Request No. 315, Application of Alternative Source Term
Project stage: Request
ML0708904292007-03-23023 March 2007
E-mail from Alex S. Polonsky to Licensing Board Informing That Amergen Withdraws the Claim of Untimeliness Contained within Its Motion to Strike
Project stage: Request
ML0708803932007-03-28028 March 2007
Additional Information - License Amendment Request No. 315, Application of Alternative Source Term
Project stage: Request
ML0710800192007-04-26026 April 2007
License Amendment Application of Alternate Source Term Methodology
Project stage: Other
ML0711703892007-04-26026 April 2007
Technical Specifications Application of Alternate Source Term Methodology
Project stage: Other
ML0713102132007-05-0404 May 2007
Additional Information - License Amendment Request No. 315, Application of Alternative Source Term
Project stage: Request
2007-02-02
[Table View] |
Text
From:
Ed Miller To:
david.distel@exeloncorp.com Date:
02/09/2007 3:36:25 PM
Subject:
Question from Telecon
- Dave, Attached is a write up of the verbal question that Michelle had from the Telecon this morning.
G. Edward Miller Project Manager Division of Operating Reactor Licensing U.S. Nuclear Regulatory Commission (301) 415-2481
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Question from Telecon Creation Date 02/09/2007 3:36:25 PM From:
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GXM@nrc.gov Recipients Action Date & Time exeloncorp.com Transferred 02/09/2007 3:37:01 PM david.distel (david.distel@exeloncorp.com)
Post Office Delivered Route exeloncorp.com Files Size Date & Time MESSAGE 778 02/09/2007 3:36:24 PM TEXT.htm 558 OC RAI MSIV leakage source_1.wpd 8934 02/09/2007 11:51:37 AM Options Auto Delete:
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Delivered & Opened
RAI - MSIV Leakage Pathway Activity Modeling:
In looking at the responses to RAI Nos. 2 and 5, provided in licensee letters dated January 24 and February 2, 2007, and considering the potential dose impact of assumption made in the dose analysis, the staff has further questions about the modeling of aerosol and iodine removal in the main steam line piping.
With respect to the modeling of the MSIV leakage pathway, Appendix A to RG 1.183 states that the activity available for release via MSIV leakage should be assumed to be that activity determined to be in the drywell for evaluating containment leakage. The guidance intends to give a reasonable proxy for the radionuclide concentration in the steam that is flowing from the reactor vessel and/or from the drywell, depending on the location of the break that is assumed for the LOCA analysis. In the licensees analysis of the MSIV leakage pathway, this guidance has been interpreted such that the flow is modeled from the drywell into the MSIV, and includes the effect of drywell sprays, containment leakage and mixing with the wetwell airspace (when assumed) to reduce the aerosol and iodine concentration in the source volume.
The staffs concern is that this modeling of the source concentration would underestimate the concentration of radionuclides that are in the steam leaking past the MSIVs into the environment and that the spray removal in the drywell would change the aerosol size distribution so that the model for deposition in the main steam lines is not applicable. Please address the appropriateness and conservatism of your of modeling the MSIV leakage activity source in this manner.