ML20199C287
| ML20199C287 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 06/16/1986 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | Noonan V Office of Nuclear Reactor Regulation |
| References | |
| SBN-1116, NUDOCS 8606180037 | |
| Download: ML20199C287 (3) | |
Text
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SEABROOK STATION Engineering Offica
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June 16, 1986 Put2c Service of New HampeNro SBN 1116 NEW HAMPSHIRE YANKEE DIVISION T.F..
B7.1.2 United States Nuclear Regulatory Commission Washington, DC 20555 Attention:
Mr. Vincent S. Noonan, Project Director PWR Project Directorate No. 5
References:
(a) Construction Permits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 (b) PSNH Letter (SBN-1020), dated April 25, 1986,
" Resolution of Power Systems Branch Confirmatory Items", J. DeVincentis to V. S. Noonan (c) PSNH Letter (SBN-1066), dated May 23, 1986,
" Response to Request for Additional Information on SER Confirmatory Issue No. 25", J. DeVincentis to V. S. Noonan (d) PSNH Letter (SBN-1103), dated June 11, 1986,
" Response to Request for Additional' Information on SER Confirmatory Issue No. 25", J. DeVincentis to V. S. Noonan Subj ect :
Qualifications of Isolators in Gamma-Metrics Excore Neutron Detector Equipment
Dear Sir:
The following information is provided to resolve a question raised by the Staf f during a discussion on June 13, 1986, pertaining to above subject.
There are no non-Class IE outputs from the Gamma-Metrics excore neutron detectors which require the use of qualified isolators. Although References (b), (c), and (d) stated that the neutron detector computer inputs (IRTU) were from qualified isolators, this is not really a necessary requirement since the analysis and test provided in Reference (b) demonstrated that there is insufficient voltage and current available from a failure within an IRTU to cause a detrimental ef fect on field devices i.e., neutron detectors.
k DO E
8 col Seabrook Station Constructicn Field Office. P.O. Box 700 Seabrook. NH O3874 O
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United States Nuclear Regulatory Commission Attention:
Mr. Vincent S. Noonan Page 2 Therefore, there is no need to qualify the output devices from the neutron detectors as isolators.
Furthermore, the transmitter used as the output device from the neutron detector is not used as an isolator in any other safety related circuit.
Very truly you s, N/
A John DeVincentis Director of Engineering cc: Atomic Safety and Licensing Board Service List
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