ML20101P655
| ML20101P655 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 12/31/1984 |
| From: | Tucker H DUKE POWER CO. |
| To: | Adensam E, Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8501070221 | |
| Download: ML20101P655 (3) | |
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DUKE POWER Gonnun-P.O. BOX 33180 CHARLOTTE, N.C. 28242
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December 31, 1984 m -n Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Attention: Ms. E. G. Adensam, Chief Licensing Branch No. 4 Re: Catawba Nuclear Station Docket Nos. 50-413 and 50-414
Dear Mr. Eenton:
Catawba FSAR Table 1.9-1, Item II.F.2 provides a description of the incore thermocouple system. As noted in this section the present incore thermocouple system is being upgraded. The following information describes the back up display which will be included in the upgrade. This information is provided as a supplement to the description currently in FSAR Table 1.9-1.
SYSTEM LAYOUT (Refer to Figure 1)
The incore thermocouple back up display system utilizes the Class IE Westinghouse microprocessor RVLIS system for data gathering, signal conditioning, and transmission of thermocouple information. Each train receives 20 core exit thermocouples'as inputs.
Each train then outputs its thermocouple information to its safety grade back up display and also, through isolation devices to the plant computer which serves as the primary display. The back up displays are alphanumeric / graphic plasma flat panel displays located en the main control boards in the Control Room.
Either train by itself meets the requirements of providing readings of 4 thermocouples per core quadrant. All of this equipment, including isolators, is a part of the Westinghouse microprocessor based RVLIS system which has been described in previous submittals.
BACK UP DISPLAY l
The thermocouple information is presented by display "pages" on the alphanumeric / graphic flat panel displays. Pushbuttons are provided to select the display pages.
Information available through the back up displays includes individual thermocouple temperatures, average of the' 5 highest temperatures, the 5 highest thermocouple readings and their core location, and a spatially oriented core map with temperature shown at each thennoccuple location.
In addition, a time-history graphic of the average of the 5 highest thermocouple temperatures can be displayed. The range of the thermocouple. displays encompasses 2000F to 23000F.
85D1070221 841231 PDR ADOCK 05000413 s[j P
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r Mr. Harold R. Dent:n, Director December 31, 1984 Page Two Very truly yours, db 9a1 B. Tucker ROS: sib Attachment cc: Mr. James P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Ruite 2900 Atlanta, Georgia 30323 NRC Resident Inspector Catawba Nuclear Station Mr. Robert Guild, Esq.
P. O. Box 12097 Charleston, South Carolina 29412 Palmetto Alliance 2135 Devine Street Columbia, South Carolina 29205 Mr. Jesse L. Riley Carolina Environmental Study Group 854 Henley Place Charlotte, North Carolina 28207
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t 9-9 FIGURE 1 RVLIS
. MICR0 PROCESSORS li
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__a BACK UP i
8 DISPLAY i
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TRAIN I
A i
' TRAIN I
TRAIN A (20T/C's) l I
(Isolated)20T/C's i
l TRAIN B (20T/C's)
(Isolated)20T/C's TO PLANT COMPUTER (PRIMARY DISPLAY) i i
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B i TRAIN l
REACTOR s
B VESSEL L--._'
TRAIN BACK UP l
DISPLAY CONTAINMENT VESSEL INCORE THERM 0 COUPLE BACK UP DISPLAY SYSTEM CONFIGURATION l
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