ML061860463

Draft RAI (Radiological) Re. Full-Scope Application of Alternative Source Term

ML061860463
Person / Time
Site:	Monticello
Issue date:	06/29/2006
From:	Tam P NRC/NRR/ADRO/DORL/LPLE
To:	Loeffler R, Salamon G Nuclear Management Co
Peter Tam, LPL3-1
References
TAC MC8971, TAC MD2395
Download: ML061860463 (2)

Text

From: Peter Tam To: Loeffler, Rick; Salamon, Gabor Date: 06/29/2006 8:36:47 AM

Subject:

Monticello: Draft RAI (Radiological) re. Full-Scope Application of Alternative Source Term Gabe, Rick:

Our radiological consequences reviewer, Michelle Hart, has written the following draft questions for discussion with you in a telephone conference. We will decide how to disposition these draft questions in the conference:

1. What is the basis for the assumed reduction in leakage through the main steam isolation valves (MSIVs) at 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> and 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> in the loss of coolant accident (LOCA) dose analysis?

The submittal indicates that the reduction in leakage into the main steam lines is consistent with the reduction in primary containment leakage based on reduction of primary containment pressure. How does the reduction in primary containment pressure lead to a reduction in MSIV leakage?

2. Does the LOCA analysis modeling of iodine aerosol deposition in the MSIV leakage pathway account for the preceding removal of aerosols in the primary containment by natural deposition?

3. Was potential iodine revolatilization accounted for in the modeling of iodine removal for the LOCA MSIV leakage pathway? Does the piping temperature profile used to determine the aerosol deposition efficiency include heating from aerosols deposited in the piping?

4. Please provide the control room shine dose calculations, including any diagrams that indicate the location of the source(s) and receptor(s).

Please call me to set up the telephone conference for the near future, but we will avoid Friday July 7.

The sole purpose of this e-mail is to prepare you and others for the requested telephone conference. It does not formally request for information, and it does not state a formal NRC staff position.

Peter S. Tam, Senior Project Manager Plant Licensing Branch III-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation e-mail: pst@nrc.gov Tel.: 301-415-1451 CC: Arias, Jesus; Hart, Michelle Mail Envelope Properties (44A3C95F.4AD : 12 : 35330)

Subject:

Monticello: Draft RAI (Radiological) re. Full-Scope Application of Alternative Source Term Creation Date 06/29/2006 8:36:47 AM From: Peter Tam Created By: PST@nrc.gov

Recipients Action Date & Time nmcco.com Transferred 06/29/2006 8:37:36 AM Gabor.Salamon (Gabor Salamon)

Jesus.Arias CC (Jesus Arias)

Richard.Loeffler (Rick Loeffler) nrc.gov OWGWPO04.HQGWDO01 Delivered 06/29/2006 8:36:52 AM MLH3 CC (Michelle Hart) Opened 06/29/2006 8:38:06 AM Post Office Delivered Route nmcco.com OWGWPO04.HQGWDO01 06/29/2006 8:36:52 AM nrc.gov Files Size Date & Time MESSAGE 2960 06/29/2006 8:36:47 AM Options Auto Delete: No Expiration Date: None Notify Recipients: Yes Priority: Standard ReplyRequested: No Return Notification: None Concealed

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