ML20217Q586
| ML20217Q586 | |
| Person / Time | |
|---|---|
| Site: | Paducah Gaseous Diffusion Plant |
| Issue date: | 03/06/1998 |
| From: | Toelle S UNITED STATES ENRICHMENT CORP. (USEC) |
| To: | Paperiello C NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| Shared Package | |
| ML20217Q591 | List: |
| References | |
| GDP-98-0040, GDP-98-40, NUDOCS 9803120302 | |
| Download: ML20217Q586 (2) | |
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March 6,1998 GDP 98-0040 Dr. Carl J. Paperiello Director, Office of Nuclear Material Safety and Safeguards Attention: Docuinent Control Desk United States Nuclear Regulatory Commission Washington, D.C. 20555-0001 Paducah Gaseous Diffusion Plant (PGDP)
Docket No. 70-7001 Compliance Plan Issue 36 - Transmittal of Revision to Updated Seismic Haz2rd Analysis for
' NRC Approval
Dear Dr. Paperiello:
By letter dated December 1,1997 (Reference 1), USEC transmitted the updated seismic risk analysis mquired by Issue 36 of DOE /ORO-2026," Plan for Achieving Compliance with NRC Regulations at the Paducah Gaseous Diffusion Plant," to the NRC for approval. In accordance with a J
commitment contained in the December 1,1997 letter, on February 23,1998 (Reference 2), USEC submitted to the NRC a status ofits assessment of the impact of the updated seismic hazard on the final design of the planned seismic modifications to Buildings C-331 and C-335 and on the structural, piping, and equipment analyses reported in the SAR Update (Reference 3). USEC's Febrwy 23,1998 status letter contained the follo ving commitment:
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A revision of the updated seismic risk analysis to refine the vertical acceleration j
spectrum will be completed and submitted to the NRC by March 6,1998.
I t.
As discussed with Mr. Persinko of your staff, Risk Engineering has revised the updated seismic f
hazard report to refine the vertical acceleration spectrum to account for distance from the source and 1
site-specific soil characteristics. The aclosure provides a copy of this revised report for NRC approval. The revised report results in lower vertical accelerations below 20 Hz and above 70 Hz for a 250-year return period event. From 20 Hz to 70 Hz, the peak vertical acceleration increases by 5 to 11 percent. The impact assessment described in USEC's February 23,1998 letter will be based on this revised vertical acceleration spectrum.
DR DOC M
6903 Rockledge Drive, Bethesda. MD 20817-1818 Teqhone 301-564-3200 Fax 301-564-3261 http:#wwv.usec. con OfDces in Livermore. CA Paducah. KY Portsmouth. OH Washington, DC
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x Dr. Carl J. Paperiello March 6,1998 GDP 98-0040, Page 2 Should you have any questions related to this subject, please contact Steve Routh at (301) 564-3251.
There are no new commitments contained in this submittal.
Sii.cerely, n
S. A.
In Steven A.Toelle Nuclear Regulatory Assurance and Policy Manager
References:
1.
Letter from Steven A. Toelle (USEC) to Mr. Robert C. Pierson (NRC),
" Compliance Plan Issue 36 - Transmittal of Updated Seismic Risk Analysis for NRC Approval," Paducah Gaseous Diffusion Plant, Letter No. GDP 97-0201, December 1,1997.
2.
Letter from Steven A. Toelle (USEC) to Dr. Carl J. Paperiello (NRC), " Status of Impact Assessmentof Updated Seismic Hazard," Paducah Gaseous Diffusion Plant, Letter No. GDP 98-0029, February 23,1998.
3.
Letter from James H. Miller (USEC) to Dr. Carl J. Paperiello (NRC),
" Certificate Amendment Request - Update the Application Safety Analysis Report," Paducah Gaseous Diffusion Plant, Letter No. GDP 97-0188, October 31,1997.
Enclosure:
" Updated Probabilistic Seismic Hazard Analysis for the Paducah Gaseous Diffusion Plant, Paducah, Kentucky" Final Report, (Revision 1), Risk Engineering, Inc.,
March 5,1998 cc:
- Mr. Robert C. Pierson, NRC HQ NRC Region III Office NRC Resident Inspector-PGDP NRC Resident inspeebr-PORTS Mr. Randall M. DeVault (DOE)