ML18051A333
| ML18051A333 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 03/10/1983 |
| From: | Johnson B CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| GL-82-28, NUDOCS 8303180167 | |
| Download: ML18051A333 (3) | |
Text
consumers Power company General Offices: 212 West Michigan Avenue, Jackson, Ml 49201 * (517) 788-0550 March 10, 1983 Dennis M Crutchfield, Chief Operating Reactor Branch No 5 Nuclear Reactor Regulation US Nuclear Regulatory Commission Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT - RESPONSE TO NRC GENERIC LETTER 82-28 NRC Generic Letter 82-28 entitled "Inadequate Core Cooling Instrumentation System" and dated December 10, 1982 requested that Consumers Power Company provide the following information:
- 1.
The design of the reactor coolant inventory system selected.
- 2.
Schedules for engineering, procurement and installation.
- 3.
Review that status of conformance of all components of the Inadequate Core Cooling (ICC) instrumentation system including:
- a.
Subcooling Margin Monitor
- b.
Core-Exit Thermocouples c,
Reactor Coolant Inventory Tracking System The questions given in the appendix to NRC Generic Letter 82-28 provide a means for providing the information requested above.
Consumers Power Companys answers to these questions are as follows:
1.a.
The design of the reactor coolant inventory system selected t_o be installed at the Palisades Plant is the Westinghouse Reactor Vessel Level Instrumentation System (RVLIS) as reviewed and reported in NUREG/CR-2628 with the following deviation:
(1) The pressure taps for the RVLIS installed on the Palisades Plant will be at the centerline of the cold leg and at a spare part length control rod flange near the top of the reactor vessel head.
This arrangement is necessary due to not having an available tap at the bottom of the reactor vessel.
-~
8303180167-~830:310 PDR ADOCK 05000255 P
PDR OC0383-0010A-NL02
I I.
<.l-.-~-
DMCrutchfield, Chief Palisades Plant RESPONSE TO GENERIC LETTER 82-28 March 10, 1983 2
l.b.
The existing ICC instrumentation consists of two subcooling margin monitors each monitoring one coolant loop.
The temperature range of the instruments is 515°F to 615°F.
The pressure input is 0-2500 psia. This instrumentation is described in Consumers Power Company letter dated December 19, 1980.
Also there are 45 core exit thermocouples that feed into the primary data logger which prints out the readings on a typewriter display in the control room.
I.e.
The description of completed or planned modifications is an follows:
The Westinghouse RVLIS as described will be installed.
Consumers Power Company will perform a "cost-effective" upgrading of the core exit thermocouples to meet the intent of the NRC requirements described in NUREG-0737 Item II.F.2. Details of what this upgrade entails will be provided in the form of data sheets as requested in NRC Generic Letter
- 82-28 by April 15, I983.
The subcooling margin monitor will be upgraded to provide the ranges required by Reg Guide I.97.
- 2.
A design analysis and evaluation of inventory trend instrumentation, and test data to support the selected Westinghouse RVLIS was evaluated in NUREG/CR-2628.
No deviations are identified.
- 3.
A description of tests and results of tests completed for evaluation, qualification and calibration of additional instrumentation was evaluated in NUREG/CR-2628.
No deviations are identified.
- 4.
Core exit thermocouple evaluation will be provided by April 15, 1983 as indicated in item l.c.
- 5.
The computer, software and display functions will be Westinghouse supplied microprocessor and software with an analog display in the control room for the RVLIS.
The core exit thermocouples will have a chart recorder in the control room.
The subcooling margin monitor is a Combustion Engineering supplied microprocessor which will have upgraded software with digital readout in the control room.
Also, all equipment is to be class IE.
- 6.
Although Consumers Power Company expects the ICC described above will be installed and operational during the 1987 refueling outage, a detailed schedule and implementation plan will be provided in Consumers Power Company's response to Generic Letter 82-33.
- 7.
A description of the guidelines for use of the RVLIS and analyses used to develop procedures will be given at a later date.
- 8.
Operator instructions in emergency operating procedures for ICC and how these procedures will be modified when the final monitoring system is implemented will be provided at a later date.
OC0383-00IOA-NL02
1----
DMCrutchfield, Chief Palisades Plant RESPONSE TO GENERIC LETTER 82-28 March 10, 1983
- 9.
A.
Westinghouse dp System 3
- 1.
The effect of instrument uncertainties on the measurement level was evaluated and reported in NUREG/CR-2628.
- 2.
The differential pressure transducers are located outside containment for the RVLIS on the Palisades Plant.
- 3.
Hydraulic isolators and sensors are included in the impluse lines for the RVLIS on the Palisades Plant.
The oath or affirmation statement required on this response will be forth-coming the week of March 14, 1983 due to the unavailability of Consumers Power Company officers.
The NRC staff was made aware of the situation and concerned with the action.
Brian D Johnson Staff Licensing Engineer CC Administrator, Region III, USNRC NRC Resident Inspector - Palisades OC0383-0010A-NL02