ML19289F591

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Submits Responses to NRC 790607 Questions Re Gaseous Effluent Monitoring Sys
ML19289F591
Person / Time
Site: Calvert Cliffs  Constellation icon.png
Issue date: 06/12/1979
From: Wylie H
BALTIMORE GAS & ELECTRIC CO.
To: Reid R
Office of Nuclear Reactor Regulation
References
NUDOCS 7906150141
Download: ML19289F591 (6)
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Text

{{#Wiki_filter:/ O ALTIMORE ( GAS AND ELECTRIC CHARLES CENTER. P.O. BOX 1475 BALTIMORE, MARYLAND 21203 ELECTRIC ENGINEERING June 12, 1979 DEPARTMENT Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555 Attn: Mr. Robert W. Reid, Chief Operating Reactors Branch #4 Division of Operating Reactors

Subject:

Calvert Cliffs Nuclear Power Plant Unit Nos.1 and 2 Response to Questions on Gaseous Effluent Monitoring Systems Centlemen: Attached are our answers to questions telecopied to us on June 7, 1979, to support follow-up reporting on the Three Mile Island Unit 2 event. Very truly yours, r /!N -c; l H. B. Wylie, III' Engineer HBW/lmp Attachment cc - Messrs. E. L. Conner, Jr. - NRC J. A. Biddison, Esquire G. F. Trowbridge, Esquire 2229 052 7906150//// ;(

Response to NRC Questions on Noble Gas Gaseous , Effluent Monitorine System at Calvert Cliffs, Units 1 & 2 The following answers are co= mon to all our radio gas monitors. The numbers refer to the corresponding questions. 2. They all have G-M tube detectors. 5. We are not sure what is meant by the " Calibration Factor". However, from the attached " Activity Response Curves", the slope of the linear portion of the curves has the same units as your " Calibration Factor". Figure 5-13 is for RE-2191 and Figure 5-12 is for the remaining monitors. If you are looking for something different, let us know. 6 They all use Cesium 137 for calibration. 8. They all have an audio-visual high alarm in the main con-trol room. In addition, RE-5350, the control room venti-lation monitor, closes the outside air inlet damper, closes the exhaust dampers, and starts the filter fans and opens their dampers on a high radiation signal. The following are the individual monitors and the remaining answers. RE-1752 - Condenser Vacuum Discharge (one for each unit) 1 The sample is from the air removal system discharge line before entering the main vent. 6 3. Range of detector: 10*-10 cpm 4. Maximum detectable release rate: 5.6 C/sec 7. Alarm set point: 500 cp= (200 cpm for Unit 2) RE-5406 - ECCS Pump Room Ventilation (one for each unit) 1. Sample taken from exhaust fan discharge duct before connecting to the main vent exhaust duct. 3. Range of detector: 10*-106 cpm 4. Maximum detectable release rate: 1.4 C/sec 7. Alarm set point: 2000 cpm (1000 cpm for Unit 2) RE-5410 - Waste Processing Area (one for each unit) 1. Sample taken from waste processing exhaust fan dis-charge duct before entering main vent exhaust plenum. 3. Range of detector: 10*-106 cpm 2229 053

4. Maximum detectable release rate: 21.7 C/sec 7. Alarm set point: 600 cpm (300 cpm for Unit 2) RE-5415 - Main Vent (one for each unit) 1. Sample taken from top part of stack. 3. Range of detector: 10*-106 eps 4. Maximum detectable release rate: 44.6 C/sec 7. Alarm set point: 720 cpm RE-5281 - Containment Atmosphere (one for each unit) 1. Sample taken from the containment atmosphere or the suction to the purge air exhaust fan. 3. Range of detector: 10'-106 cpm 4. Maximum detectable release rate: 23.6 C/sec 7. Alarm set point: 2 x 105 cpm (*. 1^4 com for Unit 2) RE-5350 - Control Room Ventilation (one co= mon to both units) 1. Sample taken from outside air intake duct before the damper to the circulation fan. 3. Range of detector: 10*-106 e p, 4. Maximum detectable release rate: 20 C/sec 7. Alarm set point: 120 cpm RE-5420 - Fuel Handling Area Ventilation (one common to both nits) 1. Sample taken from fuel pool exhaust fan discharge duct before entering main vent exhaust plenum. 3. Range of detector: 10*-106 cpm 4. Maximum detectable release rate: 16 C/se'. 7. Alarm set point: 600 cpm RE-5425 - Access Control Area Ventilation (one com=on to both units) 1. Sample taken from suction to access control area exhaust fans. 3. Range of detector: 10*-106 cpm 4. Maximum detectable release rate: 3.3 C/sec 2229 054

7. Alarm set point: 100 cpm RE-2191 - Gaseous Waste Discharge (one cornon to both units) 1. Sample taken from waste gas discharge line before entering main vent. 10 -107 1 3. Range of detector: cpm 4. Maximum detectable release rate: 25 C/sec 4 7. Alarm set point: 1.7 x 10 cpm 2229 055 O

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