ML19319C067
| ML19319C067 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 01/26/1977 |
| From: | Roe L TOLEDO EDISON CO. |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8001310443 | |
| Download: ML19319C067 (3) | |
Text
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Toledo Edison Co J F Stols.3 -
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.one signed DEICRIPTioN ENCLoSU RE Ltr su=marizing non-IE to IE isolation qualifications of the reactor protection
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systea & the safety features aCouation system......
_DO NOT REMOVE PLANT NAME:
Davis Besse 41
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g N 271977 Director of Nuclear Reactor Regulation hM 4
Attn:
Mr. John F. Stolz, Chief as q
Light Water Reactors Branch No. 1 Dj i
Division of Project Management E
18 United States Nuclear Regulatory Commission Washington, D.C.
20555
Dear Mr. Stolz:
This letter is written to summarize the non-IE to IE isolation quali-fications of the Davis-Besse Nuclear Power Station, Unit No. I reactor protection system (RPS) and the safety features actuation system (SFAS).
This information is also submitted to resolve a part of the Outstanding Review Item No. 11 in the Safety Evaluation Report for this unit.
In Section 8.3.1.2.14 of the Davis-Besse FSAR, we have documented the following infor=atica on the SFAS and RPS:
1.
The isolation ratings of all of the isolation devices in these systems.
2.
The maximum credible voltages that can be either directly coupled into the non-IE circuit entering these systems or electromagnetically coupled into these circuits.
In a letter dated December 17, 1976, we have transmitted to the NRC test reports on tests that were performed by Consolidated Control Corporation on the SFAS, and by B&W on the RPS.
The following additional information also pertains to these systems:
1.
RPS - the experience of B&W with similar RPS in operations in other plants has shown that the RPS has a high degree of immunity to interference and noise in a power plant. In addition, noise tests were performed by locating the RPS in close proximity with high level electrical noise sources.
In all cases the noise had no effect on the systems.
9 55 THE TCLECO EDISON COMPANY ECISCN PLAZA 300 MADISON AVENUE TOLEDO. CHIO 43652
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SFAS - the noise test performed on the system imposed noises considerably higher in magnitude than those possible to be imposed on the system at the Davis-Besse Nuclear Power Station. During these tests the system showed that it was immune to the effects of the noise that were imposed upon the system during the tests.
This information has demonstrated that these systems will not be subject to noise interference which could cause false trips or prevent them from tripping when required.
Very truly yours, M
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