RBG-26184, Forwards Proposed Design for Temp Monitoring Sys in Uhs,In Response to Sser 3 (NUREG-0989) & License Condition 2(C)(9) of License NPF-47

Forwards Proposed Design for Temp Monitoring Sys in Uhs,In Response to Sser 3 (NUREG-0989) & License Condition 2(C)(9) of License NPF-47

ML20234D373
Person / Time
Site:	River Bend
Issue date:	06/29/1987
From:	Booker J GULF STATES UTILITIES CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
RTR-NUREG-0989, RTR-NUREG-989 RBG-26184, NUDOCS 8707070189
Download: ML20234D373 (3)

Text

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1 GULF STATES UTILITIES COMPANY .i RNP.R BEND STATION POST OFFICE BOX 220 ST. FRANCISVILLE, t.OUISlANA 70775 -

arf A CODE 604 635-6094 346 B651 June.29, 1987:

REG- 26184-File'No. G9.5,G9.25-U. S. Nuclear Regulatory Commission Document Control Desk Washington, D. C. .20555 Gentlemen: j 1

River Bend Station - Unit I Docket No. 50-458' As.. required by Supplement No.-3 of the Nuclear: Regulatory Commission's (NRC) Safety Evaluation Report (Nt1 REG-0989) related to the operation of' ,

River Bend Station (RBS) and in response to License . Condition 2(C)(9) of

^

Facility Operating' License NPF-47, attached please find Gulf. States ]

Utilities Company's (GSU) proposed. design for a temperature monitoring system in the RBS Ultimate Heat Sink (UHS).

It is requested that the NRC review the proposed design for approval in 3 order that installation and operation of the system can be accomplished

~

l prior to startup following thefirst refueling outage -

(currently 'i scheduled to begin September 15, 1987). GSU is currently reviewing the RBS Technical Specifications regarding the UHS temperature' monitoring I system to determine the need for revisions.

If you have any questions concerning this submittal please contact Mr.-

M. W. Henkel at (409) 838-6631, extension.2282.

Sincerely,

. f 9hw 8707070189 870629 PDR ADOCK 05000458 J. E. Booker E PDR Manager - River Bend oversight River Bend Nuclear Group JEB/ R /f chs Attachments.

cc: U. S. Nuclear Regulatory Commission-

! . Region IV

-611 Ryan Plaza Drive, Suite 1000 Arlington, TX' 76011 Senior Resident Inspector U. S. Nuclear Regulatory Conmission P. O. Box 1051- p' St. Francisville, LA 70775 ilt

, N.

ATTACHMENT The following provides a description of the proposed temperature monitoring system for the RBS UHS.

The UHS basin temperature monitoring system will consist of two(2) microprocessors. One microprocessor will have the capability of accepting inputs from eight (8) Resistance Temperature Detectors j (RTDs) arranged to measure the basin temperature at various locations and depths (see attached figure). These RTDs will provide

" narrow range" averaged temperatures within the ranges 75'F to 85'F.

The second microprocessor will accept signals from four(4) RTDs arranged at various locations and depths of the basin to measure the averaged " wide range" temperatures of 0*F to 100*F.

Both microprocessors will be mounted locally and provided with indication of the basin average temperature. In addition, indication will be provided in the Main Control Room for UHS basin average temperature.

The instruments provided will be non-Class IE and of an acceptable commercial grade. The raceway system and equipment supports will be

, seismically qualified to prevent damage to the Category I UHS basin structure.

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