ML20204B447
| ML20204B447 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/19/1987 |
| From: | Hukill H GENERAL PUBLIC UTILITIES CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 5211-87-2065, NUDOCS 8703250058 | |
| Download: ML20204B447 (1) | |
Text
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a GPU Nuclear Corporation hpg g7-Route 441 South 4
.1 Post Office Box 480
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Middletown, Pennsylvania 1705n0191
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717 944 7621 TELEX 84 2386 j'
Writer's Direct Dial Number:
March 19,1987 5211-87-2065 U.S. buclear Regulatory Commission Attention:- Docunent Control Desk yashington, DC 20555 Gqntlemen:
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' "Three Mile Island Nuclear Station Unit 1 (TMI-1)
Operating License No. DPR-50 s
Docket No. 50-289 Reactor Coolant Inventory Trending System (RCITS) -
m Water Level Indication The wa+.ev inventory trending subsystem of the Reactor Coolant Inventory Trending System is a differential pressure measurement system consisting of two inwpendent instrunent loops to measure reactor vessel water level and hot leg water level. The differential. pressure transmitters are powered from and
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have their sign 31s conditioned by lE qualified equipment powered from vital buses. At the signal conditioning cabinets, the input signals from the transmitters ere converted from current to voltage signals, conpensated based on primary system and reference leg temperature process variables, and routed to the Control Room.
Sigr,als enter a separate section of the Bailey 855 multiplexer and are displayed through the Bailey or Mod Comp computers.
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As; discussed with members of the NRC Staff by telephone on March 5,1987, o
,without the use of the multiplexer, water level could be determined by use of 3 voltmeter read ng the signals from the signal conditioning cabinets.
GPUM intends, to develop a correlation of voltage versus water level, either graphical snr Jabular in form, and incorporate this information into a TMI-l procedure by October 1,1987.
Sincerely, Vice President & Director, THI-l HDH/SK/pa(2122g) 8703250058 870319 cc:
- 4. Stolz PDR ADOCK 05000289 R. Conte t'
PDR T. Murley 0
0 GPU Nuclear Corporatlon is a subsidiary of the General Public Utilities Corporation t