ML20058F676
| ML20058F676 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 11/30/1993 |
| From: | Storz L CENTERIOR ENERGY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 2188, NUDOCS 9312080224 | |
| Download: ML20058F676 (2) | |
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a ENERGY 300 fAodson Avenue Louis F. $torz Tweco, OH 43652 0001 Vice Presiaent-Nuclear i
412HN9 2300 Dows-Besse Docket Number 50-346 License Number NPF-3 Serial Number 2188 November 30, 1993 I
United States Nuclear Regulatory Commission Document Control Desk Vashington, D. C. 20555 Subj ect:
10CFR50 Appendix R Exemption Request for the Containment Annulus Gentlemen:
By letter dated May 18, 1990 (Serial Number 1809), Toledo Edison submitted an exemption request from 10CFR50 Appendix R, Fire Protection,Section III.G.2 regarding the separation of redundant safe shutdown components within the containment annulus of the Davis-Besse Nuclear Power Station (DBNPS). This exemption request was based, in part, on the existence of radiant energy shields which separate redundant trains of safe shutdown circuits within the containment annulus. These shields are made in part of Thermo-Lag 330-1 fire barrier material.
By letter dated February 24, 1993 (Serial Number 2118), Toledo Edison summarized ongoing industry and NRC efforts regarding Thermo-Lag 330-1, and stated that additional information in support of the exemption request is expected to be submitted by November 1, 1993. As discissed in a conference call with the NRC staff on October 29, 1993, there has been a delay in the start of the second phase of the industry test program. This delay is due in large part to the need to re-evaluate l
the scope of the testing to account for lessons learned from the first phase of the test program. Based on these changes in the schedule for the industry resolution of the Thermo-Lag 330-1 issue, Toledo Edison's schedule for submitting additional information in support of the exemption request vill be delayed.
Additional information in support of the exemption request is nov expected to be submitted by March 31, 1994.
In the interim, Toledo Edison believes that the Thermo-Lag radiant energy shields will perform 1
their intended function. Toledo Edison plans to continue to review I O1 industry testing results to verify the capability of the Thermo-Lag radiant energy shields to perform their intended function.
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Docket Number 50-346 License Number NPF-3 Serial Number 2188 j
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Should you have any questions or require additional information, please contact Mr. Villiam T. O'Connor, Manager - Regulatory Affairs at (419).249-2366.
Very truly yours, D
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MKL/amb YT-cc:
J. B. Hopkins, NRC Senior Project Manager J. B. Martin, Regional Administrator, NRC Region III S. Stasek, DB-1 NRC Senior Resident Inspector Utility Radiological Safety Board I
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