ML20080D913
| ML20080D913 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 08/25/1983 |
| From: | Hukill H GENERAL PUBLIC UTILITIES CORP. |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.E.1.2, TASK-TM 5211-83-231, NUDOCS 8308300636 | |
| Download: ML20080D913 (5) | |
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GPU Nuclear Corporation
' NggIgf Post Office Box 480 Route 441 South Middletown, Pennsylvania 17057-0191 717 944 7621 TELEX 84 2386 Writer's Direct Dial Number:
August 25, 1983 5211-83-231 l
Of fice of Nuclear Reactor Regulatic'n Attn:
J. F. Stolz, Chief Operating Reactors Branch No. 4 Division of Licensing U. S. Nuclear Regulatory Commission l
Washington, D.C.
20555 l
Dear Sir:
Three Mile Island Nuclear Station, Unit 1 (TMI-1)
Operating Lic ense No. DPR-50 Docket No. 50-289 EW Flow Devices - D/P Transmitters In our letter of May 24, 1983 (5211-33-156), GPUN indicated that two of the installed E W sonic flow devices (controlotron) would be replaced with dif fer-ential pressure (D/P) transmitters. Since that time, testing of the remaining sonic devices has shown them to be unsatisfactory.
Based on this, by restart, all of the sonic flow devices will be replaced with D/P transmitters.
Information, as required by NUREG 0737 Item II.E.1.2, pt. 2, co document the change to the design description provided in the Restart Report, Section 2.1.1.7.3 is attached. A list of logic diagrams, electrical schematics and piping and instrument diagrams is also attached. These diagrams and schematics were provided to the NRC separately.
Sincerely, H. D.
lukill Director, TMI-l HDH:LWH:vj f Enclosure cc:
R. Conte J. Van Vliet 8308300636 830825 PDR ADOCK 05000289 P
PDR GPU Nuclear Corporation is a subsidiary of the General Public Utllities Corporation o
Emergency Feedwater System Flow Indication D/P Transmitters I.
Introduction The purpose of this modification is to replace 2 existing ultrasonic (Controlotron) flow devices with a new system utilizing 2 differential pressure transmitters and 2 annubars.
The equipment arrangement allows the modification to be made by replacement of the ultrasonic flow devices with annubars and D/P transmitters utilizing existing wiring and instrumentation.
II.
Equipment Description A.
Flow Element The Annubar Model ANR-76 is a passive stainless steel device which translates fluid pressures to a D/P transmitter (in this case). The D/P varies in a squared relationship with flow across the annubar.
The D/P detects the pressure difference between the dynamic and static pressures in the pipe.
In this respect, as well as their function of generating a D/P proportional to flow, the annubars are analyogous to flow orifices.
B.
Transmitter The Foxboro type NE 13 DM transmitters utilired are force-balance type, fully qualified for the application.
These transmitters are utilized elsewhere at IMI-1.
C.
Signal Conditioning The Foxboro SPEC 200 signal conditioning equipment is the same equipment used for all recent IE instrumentation.
D.
Indications Existing 'n'estinghouse 252 style qualified indicators in the control room are utilized for the new flow measurement.
The input signal remains 4-20 =a.
III.
Design Criteria A.
The tubing from the annubar is routed to separate transmitters.
B.
The equipment was installed and inspected per established quality standards for Nuclear Safety Related/Important to Safety components.
C.
The pressure transmitters are environmentally qualified (Intermediate Building) and seismically qualified and mounted.
I D.
The annubars are seismically qualified and meet appropriate piping code criteria E.
The pressure transmitters are located above the flood level for the Intermediate Building.
F.
The flow instrumentation are reliable and accurate and are designed to monitor the full range of system flow requirements.
G.
No single failure within the flow instrumentation will fail to provide flow indication for each train (principally prevented by redundancy).
H.
Channels are separate and independent I.
The differential pressure transmitter are to be tested (monthly) and calibration is to be provided at regular intervals (refueling).
J.
The EFW flow is indicated in the Control Room for each steam generator redundant to the ultrasonic flow devices.
K.
The EFW flow instrument channels are powered from independent emergency buses.
IV.
Installation A. Conclusion As a result of the replacement of the Controlotron with D/P system there is no change to the Technical Specification (see Amendment 78).
Also, there are no changes to operating or emergency procedures or operator training required. No alarms require change or reprioriti-cation.
Main console mounted indicators have scales of 0-800 GPM.
Half inch stainless steel tubing connects the annubar device valves to each of the two permanent feedwater flow transmitters per stean generator.
Each transmitter will be equipped with two shutoff valves, two blowdown valves, and one equalizer valve.
V.
Conclusion As a result of the replacement of the Controlotrons with the D/P system there is no change to the Technical Specification (see Amendment 78).
Also, there are no changes to operating or emergency procedures or operator training required.
No alarms require change or reprioritization.
Page 1 COMPANY DOCUMENT NO.
SHEET RE7.
TITLE OCL i
GAI 302-082 Rev. IA-0 Flev Diagram NSR/IIS GAI 30S-609 Rev. IA-0 Piping Diagram NSR/ITS GAI 302-081 Rev. IE-O Flev Diagrc=
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GAI S-204-275 Rev. IE-0 Conduit Support NSR/ITS GAI S-204-276 Rev. IE-O Conduit Support NSR/ITS
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GAI 205-358 Rev. IA-0 Conduit Suppor NSR/ITS GAI 205-359 Rev. IA-0 Conduit Support NSR/ITS GAI 205-360 Rev. IA-0 Cenduit Supper:
NSR/ITS GAI 205-361 Rev. IA-0 Conduit Support NSR/!T S GAI 421-250 Rev. IA-0 Locatien of Cere NSR/IT S Drill GAI C-204-272 Rev. IF-0 Conduit Support NSR/ITS GAI C-204-511 Rev. II-0 Conduit Suppert NSR71T S GAI C-204-146 Rev. ID-0 Conduit Supper:
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Pas:e 2 CCv2ANY DOC N ENT NO.
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