ML052560118

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Draft RAI Re. Proposed Amendment on Alternative Source Term
ML052560118
Person / Time
Site: Oyster Creek
Issue date: 08/26/2005
From: Tam P
NRC/NRR/DLPM/LPD1
To: Distel D, David Helker
- No Known Affiliation, Office of Nuclear Reactor Regulation
Tam P, NRR/DLPM, 415-1451
References
%dam200604, TAC MC6519
Download: ML052560118 (2)


Text

From: Peter Tam To: David Distel; David Helker Date: 8/26/05 9:49AM

Subject:

Draft RAI re. Proposed Amendment on Alternative Source Term (TAC MC6519)

Dave:

We are reviewing your application dated 3/28/05. Our reviewer, Carolyn Lauron, has the following question (paragraph below). We are requesting to hold a telephone discussion with you after 9/11/05.

The determination of the suppression pool pH at 30 days after a loss-of-coolant accident (LOCA) is described in Attachment 3, Page 12, of the application. This description states that the standby liquid control system (SLC) is credited as a means to buffer the suppression pool water and will prevent the pH from falling to a value less than 7 during the 30-day dose calculation period. In addition, the description states that suppression pool pH is a function of the time-dependent radiation level in the drywell and the time-dependent radiation level in the suppression pool, among other parameters. Please provide the time-dependent calculations to support the assertion that the pH will not decrease to a value less than 7 from the time of the LOCA to 30 days after the LOCA. These calculations should also address the change in pH at the time of the sodium pentaborate injection and the effects of acid formation (i.e., HCl production from the decomposition of cable insulation and HNO3 production from the irradiation of water and air).

The sole purpose of this e-mail is to prepare you and others to participate in a telephone conference with us on this issue. This e-mail does not formally convey a request for additional information, nor does it formally state an NRC staff position.

Peter S. Tam, Senior Project Manager Project Directorate I-1 Division of Licensing Project Management Office of Nuclear Reactor Regulation e-mail: pst@nrc.gov Tel.: 301-415-1451 CC: Carolyn Lauron; John Boska; Nadiyah Morgan Mail Envelope Properties (430F1DD6.F2D : 12 : 334)

Subject:

Draft RAI re. Proposed Amendment on Alternative Source Term (TAC MC6519)

Creation Date: 8/26/05 9:49AM From: Peter Tam Created By: PST@nrc.gov Recipients Action Date & Time David Transferred 08/26/05 9:50 AM distel (David Distel) owf4_po.OWFN_DO Delivered 08/26/05 9:49 AM JPB1 CC (John Boska) Opened 08/26/05 9:52 AM NSM CC (Nadiyah Morgan) Opened 08/26/05 9:49 AM

exeloncorp.com Transferred 08/26/05 9:50 AM david.helker (David Helker) nrc.gov TWGWPO01.HQGWDO01 Delivered 08/26/05 9:49 AM CLL CC (Carolyn Lauron) Opened 08/26/05 11:47 AM Post Office Delivered Route David INTernet:exeloncorp.

com owf4_po.OWFN_DO 08/26/05 9:49 AM exeloncorp.com TWGWPO01.HQGWDO01 08/26/05 9:49 AM nrc.gov Files Size Date & Time MESSAGE 2492 08/26/05 09:49AM Options Auto Delete: No Expiration Date: None Notify Recipients: Yes Priority: Standard Reply Requested: No Return Notification: None Concealed

Subject:

No Security: Standard To Be Delivered: Immediate Status Tracking: Delivered & Opened