ML112030648
| ML112030648 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 07/19/2011 |
| From: | Lichtenwalner J Exelon Corp, Exelon Nuclear |
| To: | John Hughey Plant Licensing Branch 1 |
| Hughey J, NRR/DORL, 301-415-3204 | |
| References | |
| Download: ML112030648 (2) | |
Text
From:
Jenna.Lichtenwalner@exeloncorp.com Sent:
Tuesday, July 19, 2011 1:18 PM To:
Hughey, John Cc:
kevin.borton@exeloncorp.com
Subject:
RE: Anwser to Pre-Submittal Meeting Question John:
During the NRC public meeting with Exelon regarding Peach Bottom EPU on June 14, 2011, a question was raised by the NRC staff. The following is in response to this question regarding how Containment Accident Pressure is generated during all methods of Appendix R events.
The PBAPS Fire Protection Plan (FPP) describes each of the safe shutdown methods (A, B, C, and D). In each shutdown method, the pressure in the reactor vessel is limited by operation of the SRV's (Reference FPP Section 5.2.2). The steam discharged through the SRV's is condensed in the torus and therefore, the torus temperature increases.
Calculations PM-1010 Rev. 5, "RHR Pump NPSH", and PM-1013 Rev. 3, "Minimum Containment Pressure Available", were submitted within Peach Bottom Atomic Power Station's response to a Request for Additional Information (RAI) dated June 29, 2000, concerning questions raised in a telephone conversation on May 10, 2000 regarding the August 11, 1999 LAR submittal for "Clarification on use of Containment Overpressure for Ensuring Adequate NPSH". These calculations indicate that the peak torus water temperature due to fire safe shutdown (FSSD) events was calculated as 206 deg F.
This value was used in PM-1013 to calculate the Minimum Containment Pressure Available (MCPA) for FSSD events of 7.46 psig. The 206 deg F was also used in PM-1010 to calculate the NPSH Margin for FSSD events of 4.39 feet. Note that the calculations in the June 29, 2000 document are older revisions that have since been modified (these docketed calculations are being referenced to illustrate how accident pressure is generated).
We understand that you will be placing this in ADAMS.
- Regards, Jenna Lichtenwalner Exelon Nuclear Power Uprate Licensing
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