ML18053A648
| ML18053A648 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 10/06/1988 |
| From: | Kuemin J CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NUDOCS 8810130068 | |
| Download: ML18053A648 (1) | |
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100 consumers Power l'OWERINli MICHlliAN'S l'ROliRESS General Offices: 1945 West Parnell Road, Jackson, Ml 49201 * (517) 788-0550 October 6, 1988 Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT -
ADDITIONAL INFORMATION SUPPORTING RPS TECHNICAL SPECIFICATIONS CHANGE REQUEST In response to NRC questions on the qualifications of optical isolation devices for non-class IE to class IE isolation being installed as a part of the ongoing Reactor Protection System modification, the following information is provided.
One type of isolator utilized contains the Hewlett Packard 6NI37 optical isolator which is similar to the Hewlett Packard HCPL-2630 isolator.
The HCPL-2630 and 6NI37 isolators have the same detector, same LED, and are manufactured by the same assembly process.
The HCPL-2630 has been previously tested and found to be an acceptable class IE isolation device, thus, there is no need for further testing of the 6NI37.
The maximum credible fault that the non class IE side of the 6NI37 device could be exposed to is I25 volts direct current which is fused at IO amps.
This is less than the fault the HCPL-2630 was exposed to during its qualification testing.
The other type of isolator utilized is the OPT022 ODC5AQ optical isolator which is similar to the OPT022 DC200P isolator.
We have confirmation from OPT022 that the ODC5AQ and DC200P isolators are electrically the same.
Differences exist only in the mounting method and control voltage level.
The DC200P has been previously tested and found to be an acceptable class IE isolation device~ thus, there is no need for further testing of the ODC5AQ.
The maximum credible fault that the non-class IE side of the ODC5AQ could be exposed to is I25 volts direct current which is fused at 3 amps.
This is less than the fault the DC200P was exposed to during its qualification testing.
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James L Kuemin 1
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- CC Administrator, Region III, NRC NRC Resident Inspector - Palisades I
OC1088-0I62-NL04