Safety Evaluation by the Office of Nuclear Reactor Regulation Generic Letter 92-08 Thermo-lag-related Ampacity Derating Issues Peco Energy Company Peach Bottom Atomic Power Station, Units 2 and 3 Limerick Generating Station, Units 1 and 2
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چکیده
1.0 BACKGROUND By letters dated March 13, 1998, and March 12, 1999, PECO Energy Company (the licensee) submitted a response to the U.S. Nuclear Regulatory Commission's (NRC's) Request for Additional Information (RAI) dated November 14, 1997, related to Generic Letter (GL) 92-08, "Thermo-Lag 330-1 Fire Barriers," for Peach Bottom Atomic Power Station (Peach Bottom), Units 2 and 3, and Limerick Generating Station (Limerick), Units 1 and 2. Listed below is a brief outline of the history associated with the matter under review: 3/24/97: In response to GL 92-08 and an NRC RAI dated June 22, 1995, the licensee provided documentation of its methodology intended to assess the ampacity derating factors associated with its installed fire barriers systems. 11/14/97: NRC's RAI was issued to request information regarding licensee's ampacity methodology. 3/13/98: Licensee's response addressed RAI questions. 11/4/98: A meeting was held between the NRC staff, Sandia National Laboratories (SNL), and licensee's representatives to discuss the licensee's conduit validation studies. 3/12/99 Licensee's response addressed RAI questions. The staff's evaluation of the ampacity derating methodology for Peach Bottom and Limerick Stations follows.
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