ML18043A741
| ML18043A741 | |
| Person / Time | |
|---|---|
| Site: | Palisades, Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 06/14/1979 |
| From: | Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7906190174 | |
| Download: ML18043A741 (4) | |
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General Offices: 212 West Michigan Avenue, Jac'<son, iv.;chogan 49201
- Area Code 517 788*0550 June 14, 1979 Director, Nuclear Reactor Regulation Att Mr Dennis L Ziemann, Chief Operating Reactors Branch No 2 US Nuclear Regulatory Commission Washington, DC 20555 DOCKETS 50-155 Al"ID 50-255 - LICENSES DPR-6 AllD DPR BIG ROCK POINT AND PALISADES PLANTS - RAPID RESPONSE -
- EFFLUENT MONITORING SYSTEMS Consumers Power responded by telecopy on June 12, 1979 to Rapid Response questions (received by telecopy on June 7, 1979) relating to Big Rock Point and Palisades
- effluent monitoring systems.
The response as follows was sent to Stan Nowicki.
Question:
- 1.
Location of *the effluent monitor, monitoring system (ie, principal release point, building ventilation exhaust point).
Answer:
PAL - Six subsystems feed a* main exhaust stack a - radwaste alixiliary building 32,000 CFM b - fuel pool 10, 000 CFM c - auxiliary building addition 31,000 CFM d
fuel pool addition 6,000 CFM
.e - containment purge*
70,000 CFM f
~ waste gas decay tanks.
Batch Principal monitor is on main stack.
BRP - There is an isokinetic probe 90 feet up from stack base.
Question:
- 2.
- what detector is being used.
Answer:
PAL - Two inch sodiun iodide scintillation detector.
BRF.,... Sodium.iodide thalli1m1 ac<;ivated crystal integrally to a -ohotomultiulier ':.ube that dri;;es a d.ouble cathode follower.
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2 Question:
- 3.
Readout range of detector.
Answer:
PAL - 100 to 1,000,000 CPM BRP - l to 100,000 CPS Question:
- 4.
Maximum release rate that can be detected on scale by the detector.
Answer:
. PAL - 3 Ci/SEC XE 133 BRP - 3.3 Ci/SEC assuming a diffusion mixture of air ejector off gas which is the principal contributor to total effluent release.
Question:
- 5.
Calibration factor for system.
Answer:
- PAL -
2,200 CPM = lE-04 mCi/cc 18,ooo CPM = lE-03mCi/cc l50,000 CFM = lE-02 mCi/cc BRP - See attached stack gas monitor calibration graph.
.. Question:.
- 6.
Reference radionuclide used to calibrate system.
Answer:
PAL -Xe-133 BRP - Liquid solution Csl37 to show linearity of stack gas measuring system.
Question:
Calibration based on actual samples of off gas using gamma spectral analyses rather than standard solutions.
- --7
- Alarm-setpoint for system.
v Answer:
PAL - 8,000 CPM or 4E-04 mCi/cc BRP - 0.1 Ci/SEC, at release rates above 0.1 Ci/SEC the setpoint is a factor of two above the expected release rate *but never above
~Ci/SEC E
Question:
- 8.
Alarm function of system.
Answer:
PAL - Alarm in control room - no trip on main exhaust.
a - subsystems (except PAL answer 1-6 of Question l) have alarms 3
in control room.
Items 1-a, 1-c and 1-d have partiB.l trips.
Items 1-e and 1-f have isolate trip functions on high radiation.
BRP - Alarm in control room, no isolation capabilities.
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