Letter Sequence Draft RAI |
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TAC:MD3462, Clarify Application of Setpoint Methodology for LSSS Functions (Approved, Closed) TAC:MD3463, Clarify Application of Setpoint Methodology for LSSS Functions (Approved, Closed) |
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[Table view] |
Text
From: Peter Tam To: Scarpello, Michael; Simpson, Sue; Waters, Joe Date: 01/16/2007 7:44:06 AM
Subject:
D.C. Cook: Draft RAI on 11/3/06 Application for Amendment re. RTD Bypass Loop (TAC MD3462, 3)
Sue, Joe:
By the letter dated November 3, 2006, you submitted an application for amendment regarding replacement of the RTD and bypass loop piping with detectors mounted in the primary loop piping. Our reviewer, W. Bennett, has developed the following questions which we would like to discuss with you in a conference call:
- 1. In Reference 1 (DCCNP-1 Amendment No. 296, 10/6/06), the NRC staff performed an evaluation of the inadvertent opening of a pressurizer safety or relief valve with respect to the overtemperature T trip. Please provide information to confirm that DCCNP-1 has evaluated the overtemperature T trip set point equation with respect to inadvertent opening of a pressurizer relief or safety valve.
- 2. The application states These changes are requested so that the TS Allowable Values will reflect the increased margin resulting from the plant modification. Please explain how increasing the overtemperature T and overpower T allowable values increases margin to departure from nucleate boiling (DNB). Please define margin and how the margin is increased.
- 3. In the attached table, the NRC staff performed initial calculations of the changes requested in the application. The values used (core inlet and outlet temperatures) are from tables in Chapter 14 of the UFSAR for Units 1 and 2 respectively. Please show how the expansion of the allowable values for the OPT and the OTT trip set points maintain safety consistent with the analyses as described in the UFSAR.
- 4. The calculations performed by the NRC staff show that the changes in the allowable values are within a fraction of a degree Fahrenheit. Show that the new thermowell RTDs have the capability to measure this difference in the allowable value.
This e-mail aims solely to prepare you and others for the proposed conference call. This e-mail does not formally convey an NRC staff position, and does not formally request for additional information. We will discuss during the conference call how these draft questions will be disposed.
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: John Nakoski; Samuel Miranda; William Bennett Mail Envelope Properties (45ACC896.879 : 12 : 35330)
Subject:
D.C. Cook: Draft RAI on 11/3/06 Application for Amendment re. RTD Bypass Loop (TAC MD3462, 3)
Creation Date 01/16/2007 7:44:06 AM From: Peter Tam
Created By: PST@nrc.gov Recipients Action Date & Time aep.com Transferred 01/16/2007 7:44:18 AM jrwaters (Joe Waters) mkscarpello (Michael Scarpello) sdsimpson (Sue Simpson) nrc.gov OWGWPO01.HQGWDO01 Delivered 01/16/2007 7:44:13 AM WTB1 CC (William Bennett) Opened 01/16/2007 7:44:37 AM nrc.gov TWGWPO01.HQGWDO01 Delivered 01/16/2007 7:44:13 AM JAN1 CC (John Nakoski) Opened 01/16/2007 7:46:12 AM SXM1 CC (Samuel Miranda) Opened 01/16/2007 8:21:39 AM Post Office Delivered Route aep.com OWGWPO01.HQGWDO01 01/16/2007 7:44:13 AM nrc.gov TWGWPO01.HQGWDO01 01/16/2007 7:44:13 AM nrc.gov Files Size Date & Time MESSAGE 3725 01/16/2007 7:44:06 AM message1.wpd.doc 61952 01/16/2007 7:32:24 AM Options Auto Delete: No Expiration Date: None Notify Recipients: Yes Priority: Standard ReplyRequested: No Return Notification: None Concealed
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