ML19323E241
| ML19323E241 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 05/21/1980 |
| From: | Lundvall A BALTIMORE GAS & ELECTRIC CO. |
| To: | Clark R Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0578, RTR-NUREG-578, TASK-2.B.3, TASK-TM NUDOCS 8005230245 | |
| Download: ML19323E241 (2) | |
Text
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BALTIMORE GAS AND ELECTRIC COMPANY P. O. BOX 1475 B A LTI M O R E, M ARYL AN D 21203 AnrHun E. LUNDVALL.JR.
vecc epssiorwr Sumv Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Attn:
Mr. Robert A. Clark, Chief Operating Reactors Branch #3 Division of Licensing
Subject:
Calvert Cliffs Nuclear Power Plant Units Hos. 1 & 2, Dockets Nos. 50-317 & 50-318 Follow-up Actions Resulting from TMI-2 Incident Proposal Review for Sec. 2.1.8.B of UUREG 0578 Wide Range Plant Effluent Radiation Monitorinc System Gentlemen:
NUREG 0578 requires Licensees to submit a proposed method of implementation for the vide range plant effluent monitoring system to the NRC for review and approval prior to implementation.
Presented herein is our propgsed design for Calvert Cliffs.
The existing main vent effluent radiation monitoring system consists of a scintil3ation detector to monitor particulates, a GM tube detector to monitor noble gases, nr.d a charcoal filter assembly to measure iodine.
These monitors are capable of measuring up to 1.0 pCi/cc with a release rate of h5 Ci/sec.' Indication and alarms are provided locally and in the control room.
We plan to install vide range main vent effluent radiation monitoring systems to supplement the existing monitors.
Each new system vill consist of filtering /samoling assemblies for particulate and iodine analysis and three noble gas detectors to cover the range of lx10-7 to 1x105 pCi/cc of Xe133 The low range scintillation detector, which has a rance of lx10-7 to lx10-1 uCi/ce, has its own pre-filter and crab sample assembly.
The mid (1.2x10-3 to 1.2x103 pCi/ce) and high (1x10-1 to lx105 pCi/cc) range solid state detectors share the same sampling path, although it is separate from the low range 'ampling path. The mid and high s
range sampling path also has a pre-filter and grab sample assembly.
The l
new units vill be located in the vicinity of the existing equipment in the main exhaust equipment room, elevation 69'.
All the instrument'ation and l
2-May 21, 1980 Mr. R. A. Clark i
l equipment vill be environmentally ~and seismically qualified per IEEE 323-197h and IEEE 3hh-1975 for their respective postulated incident parameters.
I The systems vill be povered from vital buses and vill have continuous l
display and alarms in the control room. The alarms vill be connected to l
both the main annunciator system and the computer.
Each detector has a checksource to verify operation. The vendor vill supply a calibration j
program for the calibration of the monitoring system during refueling j
outages.
l The new monitoring system is presently on ord'r, with the earliest e
f promised delivery in the first quarter of next year.
The isokinetic nozzles for the sampling lines should be delivered in time for installation in j
the stacks during the planned outages, which vill allow installation of the i
monitoring equipment without an additional outage.
l We request your review and approval within two months of receipt of this letter so that any viable comments can be incorporated into the j
design before installation begins.
Verytrulyyours,f(]
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J. A. Biddison, Esquire
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G. F..Trowbridge, Esquire Mr. E. L. Conner, Jr. - NRC k
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