ML20071M367
| ML20071M367 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/24/1983 |
| From: | Hukill H GENERAL PUBLIC UTILITIES CORP. |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0680, RTR-NUREG-0737, RTR-NUREG-680, RTR-NUREG-737, TASK-2.E.1.2, TASK-TM 5211-83-156, NUDOCS 8305310205 | |
| Download: ML20071M367 (1) | |
Text
GPU Nuclear Corporation G U Muclear
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8 Middletown, Pennsylvania 17057 717 944-7621 TELEX 84-2386 Writer"s Direct Dial Number:
May 24, 1983 5211-83-156 Office of Nuclear Reactor Regulation Attn:
.T.
F. Stolz, Chief Operating Reactors Branch No. 4 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C.
20555
Dear Sir:
Three Mile Island Nuclear Station, Unit 1 (TMI-1)
Operating License No. DPR-50 Docket No. 50-289 EFW Flow Devices - Controlotron As part of the Emergency Feedwater System (ETWS) upgrade GPUN committed to install by Restart, safety grade flow devices which indicate in the Control Room.
To meet this com.nitment, CPUN installed 2 Controlotron sonic flow devices on each flow path to each OTSG.
This commitment was found accept-able by the NRC Staff in the Restart SER (NUREG 0680) and the ASLB in the PID.
The physical arrangement of the "B" EFW header has resulted in interference (cross talk) between the 2 detectors which has prevented them from operating properly during the preliminary testing phase.
Efforts to date have been unable to eliminate this cross talk problem.
Due to different l
physical arrangement, no such problems exist for the Controletrons for the A OTSC.
GPUN intends to operate with one Controlotron for each OTSG energized which l
will eliminate the cross talk problem. Additionally, the other flow channel for each OTSG will be provided by a dif ferential pressure system.
GPUN will install safety grade differential pressure transmitters onto the existing annubar flow tubes prior to Restart. This system will read out in the Control Room.
This modification to the EFW system flow indication meets the requirements of Restart Report Section 2.1.1.7; SER (NUREG 0680) dated June J
1980 pp. Cl-5, C8-39; Partial Initial Decision dated December 14, 1981 p.
229; I
and NUREG 0737 II.E.1, Part 2.
1 Sincerely, 8305310205 830524 PDR ADOCK 05000289 l-P PDR y
- 1. D. Iukill I-Director, TMI-l cc:
J. Van Vliet Regional Administrator GPU Nuclear Corporation is a subsid.ary of the General Public Utilities Corporation i