ML18051B083
| ML18051B083 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 10/15/1984 |
| From: | Paulson W Office of Nuclear Reactor Regulation |
| To: | Vandewalle D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| LSO5-84-10-017, NUDOCS 8410170183 | |
| Download: ML18051B083 (6) | |
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I Docket No. 50-255 LS05-84-10-017 Mr. David J. VandeWalle Nuclear Licensing Administrator Consumers Power Company 1945 West Parnall Road
- ~ackson, Michigan 49201 October 15~ 1984
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Dear Mr. VandeWalle:
SUBJECT:
INAD~QUATE CORE COOLING INSTRUMENTATION SYSTEM
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Palisades Plant
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The NRC staff has reviewed your recent submitta 1 s date~.'.:Ja*n*uary 30, 1984 and May 31 and June 1, 1984 on the above subject. The staff co-ncurs *,
\\yith the proposed modification and the proposed implemenatio'h' schedule *. :
However, you have elected to install a Rea'ctor Vessel Level Instrument *--
utirizing the RADCAL Gamma Thermometer (RGT) probes initead of the differentia 1 pressure system which was chosen originally. The RGT has not been approved generically as a Reactor Vessel Level Instrument. Therefore;,.
you should provide the system design and system performance information needed for st~ff.review.
En~losure 1 provides the staff's review and:
summary of your "Inadequate Core Cooling Instrumentation" system.. Enclosure 2 contains staff comments on the RGT system that describe the open items_*
that must be resolved.before this item may be completed;* Pleas~ ~espond promptly to Enclo~ure 2, so that sufficient time is a~ailable for the NRC staff to review and approve.the RGT system without delaj~niyour current*
implementation schedule.
The reporting and/or recordkeeping requirements in this letter affect fewer than te*h 'respondents; 'therefore OMB clearance is not retj.uired under P.L *..96-511.
Enclosures:
As sta.ted DL':~#5 JLybM:jb toli5!84 DL:ORB~*
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10 II& I Sincerely, Origina.l signe.d by
. **waiter A. Paulson,:. Acting Chief
.Operating Reactors Branch #5 Division of Li~en~ing
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Mr. David J. VandeWalle cc M. I. Miller, Esquire Isham, Lincoln & Beale Suite 4200 One First National Plaza Chicago, Illinois 60670 Mr. Paul A. Perry, Secretary Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Judd L. Bacon, Esquire Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201
. James G. Keppler, Regional Administrator Nuclear Regulatory Commission, Region III 799 Roosevelt Road Gleri Ellyn, Illinois 6013t Township Supervisor
- Covert Township Route 1 *, Box 10 Van* Buren County, Michigan 49043 Office of the Governor Room 1 - Capitol Building Lansing, Michigan 48913 Pa.l i sades Pl ant ATTN:
Mr. Robert Montross Plant Manager Covert, Michigan 49043 U.S. Environmental Protection Agency Federal Activities Branch Region V Office ATTN:
Regional Radiation Representative 230 South Dearborn Street Chicago, Illinois 60604 Resident Inspector c/o U.S. NRC Palisades Plant Route 2, P. 0. Box 155 Covert, Michigan 49043 October 15, 1984 Lee E. Jager, P.E., Chief Environmental and Occupational Health Services Administration Michigan Department of Public Health 3500 N. Logan Street Post Office Box 30035 --*-
Lansing, Michigan 48909
ENCLOSURE 1 REVIEW AND
SUMMARY
OF CONSUMERS POWER COMPANY DESCRIPTION OF THEIR 11 INADEQUATE CORE COOLING INSTRUMENTATION SYSTEM" FOR THE PALISADES PLANT The Consumers Power Company provided a description of their final modifi-cation plans and associated implementation schedule,. for the installation of an Inadequate Core Cooling Instrumentation (ICCI) system.
The vessel level portion of the ICC! will be a RADCAL (Gamma Thermometer type) probe which will be supplied by the Technology for Energy Corporation.
The reactor vessel 1 evel indication system will include:
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0 Insertion of two RADCAL level instrument probes into existing incore instrument guide tubes.
Replacement of reactor head instrument flanges to accommodate the two probes.
Installation of Class lE cables from the r~actor head to Control Roan, via separate containment penetrations.
Installation of a qualified and redundant readout system in the Contra 1 Roan.
Modifications to the existing SPDS to provide the required "primary display 11 readout capabilities for ICC!.
The RADCAL probes will be inserted into two of the existing 45 instrument guide tubes, which will be made available for this purpose.
Of the eight level sensors per probe, four will be located above the control rod shroud and the rest below.
Display will be provided in the control roan by ~ew display modules and through the existing SPDS.
- The upgrading of the 16 existing Core Exit Thennocouples (CETs) will consist of:
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Qualification or replacement of existing cables within containment.
Replacement of existing cable connectors within containment with LOCA-qualified connectors.
Rerouting of the CET signals from an existing data-logger to the new display system, and SPDS changes to provide: the "primary display" requirement.
The CET upgrading is designed to meet the requirements of NUREG~0737. The CET.
. readout range wi 11 be 0-2300°F.
The existing subcooled margin monitor.s will be upgraded to meet NUREG-0737 requirements.
This will require (a) replacement of the present. temperature*
inputs with wide range transmitters and (b) internal modifications for wider ranye calculations.
Installation is scheduled for the next refueling outage in November '85.to January 186.
ENCLOSURE 2
'STAFF COMMENTS ON PALISADES, ICCI Reference (1):
B. Johnson to D. Crutchfield, letter dated May 31 and June 1, 1984.
- 1.
The RGT system has not been approved generically as a RVLI.
Therefore, CPC must provided the necessary information for staff review {in a timely fashion) on:
system design, performance and testing.
- 2.
The ICCI implementation sthedule should be revised to reflect such submittais for 1. above and provide adequate time for review without impacting the projected implementation schedule.
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The main staff concern is that ICCI be implemented in the time frame indicated in Reference 1.
The proposed plan is acceptable subject to 1 and 2 above.
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There is adequate desciption of the staff requirements for review and approval of an ICC system in the original order and subsequent commumi-
- cations.
However, if CPC requires additional clarification CPC should promptly contact the staff; especially if there are areas where non-compliance with NUREG-0737 requirements is anticipated.
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Reference (1) refers to the fact that the RGT probe design and its use in the Palisades reactor will be similar to the above-core application proposed for ANO and the fact that this has been reviewed by the NRC.
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- The staff has agreed for an ANO to proceed with the RADCAL probe testing.
However, no specific approval was implied, because no test results of this system have been formally presented.
In ANO's case as in CPC's it is the licensee's responsibility to provide sufficient data for system approval.
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Reference (1) also states that the proposed RVLI is based 6n the RADCAL gamma thermometer which was described in the Scanpower topical report SCP-OlA.* Rev. 4.
(Aµproved in August 1982).
It should be understood that the approval of SCP-OlA was for testing the*
instrument as a core power measuring device.
The RVLI is a different
- function thant he one approved in SCP-OlA.
Indeed the RADCAL as an RVLI will operate in a low gamma field, hence~ its operation will be much more similar to CE's Heated Junction Thermocouple rather to the
- power measuring RADCAL.