ML19289F677

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Forwards Info Re Gas Effluent Monitoring Sys,In Response to 790607 Telcon
ML19289F677
Person / Time
Site: Fort Calhoun Omaha Public Power District icon.png
Issue date: 06/08/1979
From: Short T
OMAHA PUBLIC POWER DISTRICT
To: Reid R
Office of Nuclear Reactor Regulation
References
NUDOCS 7906150313
Download: ML19289F677 (3)


Text

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r **;s Omaha Public Power District 1623 HARNEY a OMANA. NEBRASMA 68102 e TELEPHONE S36-4000 AREA CODE 402 June 8, 1979 Director of Nuclear Reactor Regulation .

ATT'l: Mr. Robert W. Reid, Chief ~

Cperating Reactors Branch 3o. k U. S. Juclear Regulatory Cc= mission Washington, D. C. 20555

Reference:

Docket No. 50-285 Gentlemen:

The Craha Public Power District received a telecopy from the Con =issien, dated June 7,1979, requesting information in regard to the Fort Calhoun Station ncble gas effluent acnitoring system. Ac-cordingly, the requested infor ation is attached.

Sincerely, O 0 }i

.I

?lT.!$E.%Shcrt Of Assistant General .tnager TES /KJM/BJH: j c:=

Attach.

cc: LeBeeuf, Lamb, Leiby & MacRae 1333 ::ev Hampshire Avenue Suite 1100 -

Wshingtcn, D. C. 20036 2230 124 f"I Sij nou i e,os/5 t

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RM051 RM052 RM057 RM062 Monitor Containment / Stack Containment Stack Condenser Off-Gas Stack Gas

1. A. Incation of effluent Normally containment / Stack vent Condenser off-gas Stack vent monitor monitoring stack vent vent system B. Print reference 11h05-M-1 11405-M-1 11h05-M-1 11405-M-1 input from 11h05-M-261 stack same as RM050/

51

2. Type of detector Deta scintillation Geiger Mueller Deta scintillation Beta scintillation detector detector detector detector 3 Readout range of thr. - 106 CPM llax . - 10 6 CPM Max. - 106 CPM Max. - 10b CPM detector (CPM) Min. - 10 CPM Min. - 10 CPM Min. - 10 CPM Min. - 10 CPM
h. Maximum release rate Max. concentration Ibx. concentration Max. concentration Max. concentration that can be detected which can be de- 4.16x10-7 Ci/cc 2.5x10-8 C1/cc 2.5x10-8 ci/cc on scale by the de- tected 2.5x10-0 Ci/cc Max. flow 5.758x107 Max. flow 5.758x107 Max. flow 5 758x107 tector Max. flow 5 758x107 cc/see cc/see cc/sec cc/sec Max. release rate Max. release rate Max. release rate Max. release rate 23.95 01/see 1.439 C1/sec 1.439 Ci/eec 1.439 Ci/sec 5 Calibration factor 4.0x107 2.4x1C5 4.0x107 4.0x107 for system (CPM per pel/cm3)
6. Reference radionuclide Gas samples are taken Gas samples are Gas samples are Gas samples are taken used to calibrate sys- and isotopically ana- taken and isotopi- taken and isotopi- and isotopically ana-PA) tem lyzed. The results of cally analyzed. cally analyzed. lyzed. The results I\) this analysis are used The results of this The results of this of this analysis are l#4 to accurately cali- analysis are used analysis are used used to accurately C3 brute the detectors. to accurately cali- to accurately cali- calibrate the de-

__, In most cases, Xe133 brate the detectors, brate the detectors, tectors. In most rsJ is the predominant In most cases. In most cases, cases, Xe133 is LJ1 gas /radionuclide. Xel33 lu the pre- Xel 33 is the pre- the predominant dominant gas / radio- dominant gas / radio- gas /radionuclide.

nuclide. nuclide.

7 Alarm setpoint for Alert alarm set- Alert alarm set- Alert alarm set- Alert alarm set-system (CPM or pCi/cm3) point 9573 CPM point 8590 CPM point 850 CPM point 2022 CPM liigh alarm set-  !!ich alarm set- liigh alarm set- liigh alarm set-point 12,764 CPM point 17,090 CPM point 3159 CPM point 8090 CPM

i i

RM051 RM052 RM057 RM062 ,

Monitor Containment / Stack Containment Stack Condenser Off Gas Stach Gas ,

8. Alarm function of On trip of alert On trip of alert On trip of alert On trip of alert system (e.g., isola- alarm, alarms on alarm, alarms on alarm, alarms on alarm, alarms on tion of purge, alarm AI-hh AI-kh CB-1 AI-kh in control room, etc.) On trip of high On trip of high On trip of high On trip of high alarm, initiates alarm, performs no alarm, closes alarm, initiates a ChilS8, which ini- control function PCV-978 and a CRiis*, which tintes a VIAS *, and except to trigger triggers high initiates a VIAS *,

triggers high alarm high alarm on alarm on monitor and triggers high on monitor monitor alarm on monitor

" VIAS - Ventilation Isolation Actuation Signal - will isolate containment purge, containment relief line, containnent sample line to and from RM050/51, gas decay tank release line (PCV521 closes), opens supply and exhaust dampers to safety injection pump rooms and prent regenerate tank room, switches control room ventilation to filtered air makeup mode, switches cantainment recirculation dampers in containment to the charcoal filtering mode.

"CRllS - Containment Radiation Iligh Signal - initiates VIAS.

N N

Ua CD Ch 1 -

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