ML12117A023
| ML12117A023 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 04/26/2012 |
| From: | Tam P Plant Licensing Branch III |
| To: | Rippy L, Loeffler R Northern States Power Co |
| Tam P | |
| References | |
| TAC ME8476 | |
| Download: ML12117A023 (1) | |
Text
Accession No. ML12117A023 From: Tam, Peter Sent: Thursday, April 26, 2012 7:40 AM To: Loeffler, Richard A.; 'Rippy, L. Randal' Cc: Wallace, Jay; Collins, Jay; Rudland, David; Wolfgang, Robert
Subject:
Monticello - Draft RAI on the relief request re. RHR service water pump non-Code repair (TAC ME8476)
Randy, Rick:
The NRC staff is reviewing your relief request dated 4/25/2012 regarding none-Code repair of the residual heat removal (RHR) system service water pump stuffing box. The NRC staff has the following draft RAI question which needs to be discussed in a conference call.
Please discuss whether sufficient leakage of 270 psi service water through the corrosion hole could occur to the point that the 1/4" drain line to the sump would be overwhelmed and service water would be forced through the seal leak-off port into the stuffing box bearing. Would introduction of pressurized service water into the top of the stuffing box bearing be detrimental to bearing service lifetime?
Peter S. Tam, Senior Project Manager (for D.C. Cook and Monticello)
Plant Licensing Branch III-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Tel. 301-415-1451