ML19332B011
| ML19332B011 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 09/05/1980 |
| From: | Naughton W COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19332B012 | List: |
| References | |
| RTR-NUREG-0578, RTR-NUREG-578 NUDOCS 8009190468 | |
| Download: ML19332B011 (4) | |
Text
EN Commonwealth Edison
) one First National Plaza, Chicago Illinois
,/
(
O 7 Address Reply to: P:st Offic'; Box 767 j Chicago. Illinois 60690 b
Q September 5, 1980 Mr. Harold R. Denton, Director Of fice of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Zion Station Units 1 and 2 Additional Information Regarding NUREG-0578 Item 2.1.8.a and 2.1.8.b NRC Docket Nos. 50-295 and 50-304 Reference (a):
July 21, 1980, letter from William F.
Naughton to Harold R. Denton.
Dear Mr. Denton:
As a result of a telecon with members of your staff concerning NUREG-0578 Items 2.1.8.a (Improved Post-Accident Sampling Capability) and 2.1.8.b (Increased Range of Radiation Monitors),
the primary NRC reviewer for Zion Station requested additional information to complete his review.
A portion of this information was submitted in Reference (a).
below.
Additional information is provided With regard to the equipment to be used for noble gas effluent monitoring, the following is provided.
1.
Enclosed is Drawing No. M-538 which has been marked to identify rerouted stream paths and a single monitor sample point.
2.
T.:- stack effluent monitor modification will consist of an Eherline SPING-4 modified for automatic isolation of four channels and for switching over, upon sensing a high radiation level, to a mobile cask containing particulate and iodine filters.
In addition, this system will be interfaced with Air Monitor Control Corporation flow measuring and sample flow control in order to provide isokinetic sampling for particulate and readout for stack discharge rate.
Readouts will be located at the local processor, technical support center and control room.
8009190 h
' 3.
The various channels and ranges follow:
a.
Particulate Channel:
Beta Scintillator; Max Range Detector can count is 1 X 106 CPM and 4 uCi; 12% (4ff) efficiency for Cesium-137.
b.
Iodine-131 Channel:
Gamma Scintillator with 2 single channel analyzers; Max Range Detector can count is 1 X 106 CPM and 12 uCi; 4% (41r) efficiency for 364 Kev
- Gamma, c.
Low Range Noble Gas Energy compensated GM tube range Channel:
2.5 X 10-2 to 1 X 103 uCi/cc for Xenon 133.
d.
Medium Range Noble Energy compensated GM tube range Gas Channel:
2.5 X 10-2 to 1 X 103 uCi/cc for Xenon 133.
e.
High Range Noble Energy compensated GM tube range Gas Channel:
1 X 100 to 1 X 105 uCi/cc for Xenon 133.
With regard to integrated dose rates for sampling actions, Attachments A and B to this letter indicate the breakdown of activities involved in obtaining the first one hour post-accident sample of reactor coolant and the containment atmosphere.
These integrated doses include the required chemical analyses of chlorides, pH, conductivity, dissolved oxygen, and dissolved hydrogen.
These dose rates also include contributory radiation exposure both from the sample itself and the building background.
Please address any questions that you might have concerning this matter to this office.
One (1) signed original and thirty-nine (39) copies of this letter are provided for your use.
Two copies of Drawing No. M-538 are enclosed for your use.
Very truly yours, William F. Naught Nuclear Licensing Administrator Pressurized Water Reactors Attachments cc:
Resident Of fice - Zion 6498A
ATTACHMENT A REACTOR COOLANT SAMPLE Dose Time
- Rate, Dose Activity Min.
R/hr.
R 1.
Walk from hot lab elev.
1 1.0
.017 617' to remote control panels located on 594'.
2.
Perform valve lineups 10 1.0
.167 at control panel.
3.
Walk to primary sample 1
1.0
.017 room.
4.
Perform panel manipulations 35 2.0 1.17 inside primary sample room.
5.
Pull pig containing diluted 3
1.0
.05 sample to elevator.
6.
Ride elevator and pull pig 5
1.0
.08 into hot lab Total Integrated Dose 1.5R y
m
-3 p
7
---g
&y
ATTACHMENT 8 CONTAINMENT AIR SAMPLE l
Dose Time
- Rate, Dose Activity Min.
R/hr.
R 1.
Walk from hot lab to remote 2
1.0
.033 control panel at elev. 592'.
2.
Perform valve lineup, initiate 10 1.0
.167 auto sequencer.
3..
Capture sample.
8 1.0 133 4.
Walk to containment air 4
1.0 067 sample panel in change room.
5.
Isolate grab sample in lead pig.
1 1.3 022 6.
Wait for sequencer to complete 7
1.0 117 purge.
7.
Withdraw pig and wheel into 5
1.0 083 hot lab for counting.
Total Integrated Dose 0.66R 1
ew w