ML20096A695
| ML20096A695 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 05/06/1992 |
| From: | Baron R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9205110182 | |
| Download: ML20096A695 (3) | |
Text
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umssee me, we aw. m mu um o Puff 661992 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C.
20555 i
Gentlemen:
In the Matter of
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Docket Nos. 50-259 Tennessee Valley Authority
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50-260 50-296
-BROWNS FERRY NUCLEAR PLANT (BFN) - HEM D'G, VENTILATION AND AIR CONDITIONING (HVAC) SEISMIC DESIGN CRITERIA - RESP 0NSE TO REQUEST FOR ADDITIONAL II: FORMATION
Reference:
TVA letter dated November 15, 1991, Heating, Ventilation and Air Conditioning (HVAC) Seismic Design Criteria This letter provides notification that BFNs seismic denign criterit. for Class I HVAC duct and supports has been revised to address specific-
. questions expressed during staff review.
i BFN submitted seismic design criteria for ductwork and supporto of Class I HVAC systems (BFN-50-C-7104 Re'tision 6) in the above reference as a post restart TVA Nuclear Performance Plan commitment. TVA met with the staff on January 23,'1992, at NRC headquarters in Rockville, Maryland to support technical review of the criteria.
Subsequently, BFN and the technical reviewer (s) held several teleconferences to resolve-energent technical questions. As a result of the-meeting and teleconferences-mentioned above, TVA agreed to revise specific sections.of the Class I
.HVAC seismic design criteria.
The; enclosure co this letter provides a summary of NRC questions / requests and the corresponding sevf alon to-the Class I IIVAC seismic design criteria. The revised criteria, BFN-50-C-7104, Revision 7, is available for NRC Staff review at the TVA Ro.kville, MarylanS office.
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2 U. S. Nuclear Regulatory Commission Psf / 06 ngr The 5 are no new cc.:amitmento contained in thie !?tter.
If you have any qi
, ions, contact me at (205) 729 7566.
Sine,erely, hqA +- -.
li d.R. Baron Manager of Site Licensing Enclosure cc (Enclosure):
NRC Resident Inspector Browns Ferry Nuclear Plant Route 12, Box 637 Athens, Alabama 35611 Mr. Thierry M. Ross, Project Manager U.S. Nuclear Hegulatory Commission One White Flibt, North 11555 Rockville Pike Rockville, Maryland 20852 Mr. B. A. Wilson, Project Chief U.S. Nuclear Regulatory Commission j
Region II l
101 Marietta Street, NW, Suite 2900
-Atlanta, Georgia 30323 i
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e ENCLOSURE BROWNS PERRY NUCI. EAR PLANT HVAC SEISMIC DESIGN CRITERIA 1.
NRC Ouestion Clarify section 1.3.1.3 of the Class I HVAC seismic design criteria (SPN-50-C-7104) with respect to the methodology for summation of two sets of seismic forces.
TVA Response Sections 1.3.1.3 and 1.6 of the Class I HVAC seismic desi6n criteria have been revised to more clearly explain the methodology to be used in the determination of the resultant of two sets of Acading combinations.
2.
NRC Ouestion Does the Class I HVAC seisaic criteria adequately accommodate normal operating and accider. load combinations (excluding earthquake loads)?
TVA Response Paragraph I of Section 1.6 on page I-7, Section 1.7.1 on page I-8, and paragraph 1 of Section 1.8.1 on page I-9 of the Class I HVAC seismic design criteria have been revised to require evaluation for normal operating conditions and to specify ellowables to be used in the evaluation.
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