ML042160163

Concrete Expansion Anchors Used to Pipe Whip Restraints at Dresden and Quad

ML042160163
Person / Time
Site:	Dresden, Quad Cities
Issue date:	03/25/2004
From:	Banerjee M NRC/NRR/DLPM/LPD3
To:	Nicely K Exelon Corp
Banerjee M, NRR/ADPT, 415-2277
References
Download: ML042160163 (3)

Text

Maitri Banerjee - Re: Concrete Expansion Anchors used for Pipe Whip Restraints at Dresden and Quad Cities Page 1 11 From: Maitri Banerjee To: ken.nicely@exeloncorp.com Date: 3/25/04 10:57AM

Subject:

Re: Concrete Expansion Anchors used for Pipe Whip Restraints at Dresden and Quad Cities Our review of your letter dated September 11, 2002, which responded to NRC inspection items related to concrete expansion anchors (CEAs), has identified the need for the following additional information:

1. Exelon letter to the NRC dated September 11, 2002, indicated that Dresden and Quad Cities UFSAR Section 3.8.4.6, Concrete Expansion Anchors," that stated CEAs were installed following manufacturer's recommendations, was revised to clarify that this section applied only to the IEB 79-02 response (i.e., not to the concrete expansion anchors for high energy restraints (HERs)). Please indicate what Code, Standard or practice accepted by the NRC for design these CEAs in safety related applications were designed to.

2. Please review the application of the CEAs used as high energy restraints that have factors of safety in the range of 2.5 to 3.8 (one at Dresden and five at Quad Cities), and discuss the safety impact of these CEAs failing to perform their safety function including restraining a pipe whip.

3. Exelon letter to the NRC, dated September 11, 2002, discussed some of the inherent conservatisms in the HER design. Please provide the results of analyses that quantify these conservatisms.

Please let me know if you would like a phone call to discuss this RAI and when you can provide the requested information.

Maitri Banerjee, PE Sr. Project Manager PD111-2, DLPM NRR CC: Lawrence Rossbach

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Re: Concrete Expansion Anchors used for Pipe Whip Restraints at Dresden and Quad Cities Creation Date: 3/25/04 10:57AM From: Maitri Banerjee Created By: MXB @nrc.gov Recipients Action Date & Time exeloncorp.com Transferred 03/25/04 10:57AM ken.nicely (ken.nicely@exeloncorp.com) nrc.gov ch-po.CHDO Delivered 03/25/04 10:57AM DEH BC (David Hills) Opened 04/07/04 11:16AM JAGI BC (James Gavula) Opened 03/28/04 02:49AM JEN BC (James Neurauter) Opened 03/25/04 01:08PM nrc.gov owf2_po.OWFNDO Delivered 03/25/04 10:57AM JSMI BC (John Ma) Opened 03/25/04 12:39PM KAM BC (Kamal Manoly) Opened 03/25/04 11:34AM nrc.gov owf4_po.OWFNDO Delivered 03/25/04 10:57AM LWR CC (Lawrence Rossbach) Opened 03/26/04 06:01PM Post office Delivered Route exeloncorp.com ch-po.CHDO 03/25/04 10:57AM nrc.gov owf2_po.OWFNDO 03/25/04 10:57AM nrc.gov owf4_po.OWFN_DO 03/25/04 10:57AM nrc.gov Files Size Date & Time MESSAGE 2316 03/25/04 10:57AM Options Auto Delete: No Expiration Date: None Notify Recipients: Yes Priority: Standard Reply Requested: No Return Notification: None

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