ML18046A300
| ML18046A300 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 01/05/1981 |
| From: | Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML18046A301 | List: |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.F.2, TASK-TM NUDOCS 8101140336 | |
| Download: ML18046A300 (2) | |
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consumers Power company General Offlcas: 212 West Michigan Avenue, J:;ckG1)n, Michigan 49201 ~ (517) 788-0550 January 5, 1981 Director,* Nuclear Reactor Regulation Att Mr Dennis M Crutchfield, Chief Operating Reactors Branch No 5 US Nuclear Regulatory Commission Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLAr-..TT - ADDITIONAL INFORMATION FOR NUREG-0737, ITEM II.F.2 G:-,.
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Since early 1980, the C-E Owners Group has conducted an evaluation of response characteristics of instrumentation under conditions of inadequate core cool-ing.
An outline of this evaluation was discussed with the NRG staff at a meeting in Bethesda, MD on May 28, 1980.
The instruments whose response characteristics have been evaluated are the subcooled margin monitor, the heated junction thermocouple system, core exit thermocouples, in-core thermo-couples, self-powered neutr~:m detectors, hot leg resistance temperature detectors and ex-core neutron detectors.
This evaluation was completeci in December 1980, and the results have recently been di.stributed to members of the C-E Ow--ners Group.
Consumers Power Corr.pany is cur:::-em:ly studying these results.
Consumers Power Company has participated over the p~st year in the C-E Owners Group development of a technique for measurement of water level in the reactor vessel.
The technique which has been selected by the C-E Owners Group is use of heated junction thermocouples (HJTC) dl.stributed at various radial and axial locations in the reactor vessel above the fuel alignment plate.
The design objective of this system is to provide a measurement of the water inventory in the reactor vessel above the fuel alignment plate.
The details of this design activity were discussed with the NRC staff at a meeting in Bethesda, MD on May 28, 1980.
Since that time, Combustion Engineering has i.ssued a commercial proposal for the HJTC System.
Consumers Power Company evaluating -che HJTC System as a possible component of an ins-crumentation system for monitoring inadequate core cooling.
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,/<.fD Attached is a Sarnmary Status Report (which we committed to provide in our December 19, 1980 NUREG-0737 response) on C-E Owners Group inadequate core cooling activities which includes a conceptual design description of an Inadequate Core Cooling (ICC) Detection System.
Consumers Power Company feels
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-n?re~tor, Nuclear R.eact. Regulation Palisades 'Plant*
January 5, 1981 that this design requires further evaluation and development before we can make a commitment to its use in the Palisades Plant.
Such evaluations, including the testing program for the HJTC System outlined in the attached report, are being conducted by the C-E Owners Group.
Consumers Power Company is a participating member.
Consumers Power Company is participating as a member of the C-E Owners Group to define appropriate generic and plant-specific documentation of the ICC Detection System.
It is expected that this definition will be completed during the first quarter of 1981.
Following completion of this C-E Owners Group effort, we will develop a plant-specific definition and schedule for further ICC Detection System documentation.
David P Hoffman Nuclear Licensing Administrator CC Director, Region III, USNRC NRG Resident Inspector-Palisades 2