ML19273C047

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Submits Addl Info Re Gaseous Effluent Monitoring Sys,In Response to 790615 Request.Discusses Location of Effluent Monitoring Sys Detectors,Range of Scintillation Detectors & Max Detectable Release Rate
ML19273C047
Person / Time
Site: Arkansas Nuclear  Entergy icon.png
Issue date: 06/22/1979
From: Trimble D
ARKANSAS POWER & LIGHT CO.
To: Reid R
Office of Nuclear Reactor Regulation
References
1-069-14, 1-69-14, NUDOCS 7906270115
Download: ML19273C047 (11)


Text

S ARKANSAS POWER & LIGHT COMPANY POST OFFICE BOX 551 UTTLE ROCK, ARKANSAS 72203 (501)371-4000 June 22, 1979 1-069-14 2-069-9 Director of Nuclear Reactor Regulation ATTN: Mr. R. W. Reid, Chi'if Operating Reactors Eranch #4 Mr. J. F. Stolz, Chief

( y/,

Light Water Reactors branch #1 U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Subject:

Arkansas Nuclear One - Units 1 & 2 Docket Nos. 50-313 & 50-368 License Nos. DPR-51 & NPF-6 Gaseous Effluent Monitoring Systems (File: 1510, 2-1510)

Gentlemen:

In response to the questions telecopied to us June 15, 1979 concerning the Gaseous Effluent Monitoring Systems at Arkansas Nuclear One - Units 1 & 2 the following is provided.

AN0-1 Iten 1) Location of the effluent monitor, monitoring system:

The following five (5) Process Radiation Monitoring Systems exist at AN0-1 to monitor gaseous effluent releases.

1) Stack Gas - Monitors effluents released curing containment purging, and during normal ventilating of the Fuel Handling and Radwaste Area.
2) Waste Gas - In line fran the waste gas surge tank and waste gas decay tanks to plant vent.
3) Main Condenser Air Discharge 2352 239
4) Hyrdrogen Purge
5) Reactor Building Penetration Roan Ventilation o , n n =- -

K ) L O "J MEMBEA M COLE SOUTH UTILITIES SYSTEM

Messrs. R. W. Reid J. F. Stolz June 22, 1979 Item 2) What detector is being used:

Gamma Scintillation detectors are utilized in the first three (3) systems listed in Item 1. Beta scintillation detectors are used in the Hydrogen Purge and Reactor Building Penetration Room Ven-tilation monitoring systems.

Iten 3) All scintillation detectors igstalled in the systems listed in Item I have a range from 0-10 cpm.

Iten 4) Maximum release rate that can be detected on-scale by the detector:

The maximum release rate that can be detected on-scale by the effluent monitoring systems depends upon the flow rate of the w gas being monitored.

The Stack Gas Monitoring System can detect on-scale release rates in excess of 3000 curies per second under minimum flow conditions (Spent Fuel Area exhaust fan running). Under maximum flow con-ditions the detector can monitor release rates in excess of 10,000 curies per second.

The Waste Gas Monitoring System can detect on-scale releases with concentrations greater than 88 microcuries per cubic centimeter.

The maximum release rate detectable is dependent on the flow rate.

Any release from the Waste Gas system is also monitored by the Stack Gas Monitoring System.

The Main Condenser Air Discharge Monitoring System can detect on-scale releases with concentrations greater than 350 micro-curies per cubic centimeter. The maximum release rate detectable is dependent on the flow rate.

The Hydrogen Purge Monitoring System can detect on-scale a release rate in excess of 4 curies per second at the design flow rate of 50 cubic feet per minute.

The Reactor Building Penetration Room Ventilation Monitoring System can detect on-scale a release rate in excess of 0.08 curies per second at the design flow rate of 2000 cubic feet per minute.

Item 5) Calibration Factor for system:

Calibration curves for the Gamma Scintillation detectors used in the Stack Gas, Waste Gas, and Main Condenser Air Discharge monitor-ing systems are attached. The Beta Scintillators were calibrated by the vendor.

23522tfNB=fht

Messrs. R. W. Reid J . F. Stol z June 22, 1979 Item 6) Reference radionuclide used to calibrate system:

Krypton-85 is used to perfom all calibrations of Gaseous '

Effluent Monitoring Systems in Unit 1.

Iten 7) Alam setpoint for system:

The alam setpoint on Stack Gas is dependent upon the cabingtion of exhaust fans operating. The minimum setpoint is 1.4 x 10 cpm.

This setpoint is used when the Containment Purge, Fuel Handling area, and Radwaste area exhaust fgns are used simultaneously. The maximum setpoint used is 5.0 x 10 cpm. This setpoint is used when either the Radwaste area or Fuel Handling area exhaust fan is being used.

The alann setpoint ased for the Waste Gas Monitoring System is variable depending on %e particular release. The setpoint is set at 1.1 times the calculated value for the release.

The Main3 Condenser Air Discharge Monitoring System setpoint is 7.0 x.10 cpm.

The Hydrogen Purge monitoring system setpoint is 5.0 x 104cpm.

The Reactor Buildir.g Penetrgtion Room Ventilation monitoring system setpoint is 5.0 x 10 cpm.

Item 8) Alam function of system:

The Stack Gas monitoring system alams in the control room if radiation levels exceed the setpoint.

The Waste Gas monitoring system alams in the control room if radiation levels exceed the setpoint. The waste gas surge tank and decay tanks will also be isolated.

The Main Condenser Air Discharge, Hydrogen Purge, and Reactor Building Penetration Room Ventilation monitoring systems alam in the control room if radiation levels exceed the setpoint.

ANO-2 Item 1) Location of the effluent monitor, monitoring system:

The applicable systems are underlined in the attached Table 11.4-1.

Item 2) What detector is being used:

Detector type is shown in Table 11.4.1 cQ2M.Sb 2352 241

Messrs. R. W. Reid J . F. Stol z June 22, 1979 Item 3) Readout range of detector:

All detectors instagled in the systems referenced in Item I ha've a range from 0 - 10 cpm.

Iten 4) Maximum release rate that can be detected on-scale by the detector:

The maximun release rate that can be detected on-scale by the ef"luent monitoring systems depends upon the flow rate of the gas being monitored. All of the subject monitoring systems can detect on-scale releases with activities of approximately 0.04 microcuria per cubic centimeter.

The Penetration Rooms monitoring system can detect a release rate in excess of 0.03 curies per second on-scale.

The Hydrogen Purge monitoring system can de mum release rate of approximately 1.0 x 10curiesject on-scale a maxi-per second.

The Fuel Handling Area effluent monitoring system can detect on-scale a maximum release rate of greater than 0.67 curies per sccGnd.

The Fuel Handling Area effluent monitoring system can detect on-scale a maximum release rate of greater than 0.67 curies per second.

The Radwaste Area effluent monitoring system can detect on-scale a naximum release rate of greater than 0.83 curies per second.

The Containment Purge effluent monitoring system can detect on-scale a maximum release rate of greater than 0.67 curies per second.

Itea 5) Calibration Factor for system:

The calibration curve for the applicable detectors is attached.

Item 6) Reference radionuclide used to calibrate system:

Krypton-85 is used to perform all calibrations of Gaseous Effluent Monitoring systems in Unit 2.

Iten 7) Alann setpoint for systen:

Alann setpoints are shown in the attached Table 11.4-1.

- p n=czre w 'tT7$::rF^

2352 242

Messrs. R. W. Reid J . F. Stol z June 22, 1979 Item 8) Alann function of system: ,

Alarm functions are shown in the attached Table 11.4-1.

Very truly yours,

.00Alicl$-

Dayid C. Trimble Manager, Licensing DCT/M0W/vb Attachment 2352 243

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