ML17334B060
| ML17334B060 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 03/06/1987 |
| From: | Alexich M INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.F.1, TASK-TM AEP:NRC:0678AD, AEP:NRC:678AD, NUDOCS 8703160131 | |
| Download: ML17334B060 (6) | |
Text
REGULATOR';NFOR}'}ATIONDISTRIBUTION TEN" <R IDS>
ACCESSIQN NBR: 8703160131 DQC. DATE: 87/03/06 NOTARIZED:
NQ FACIL:50-315 Donald C.
Cool; Nuclear Pouer Plant>
Unit 1>
Ind iana 5
50-316 Donald C.
Cook NucleaT Pouer Plant>
Unit 2> Indiana 5
AUTH. NANE AUTHOR AFFXLIATION ALEXICH>N. P.
Indiana Sc Nichigan Electric Co.
REC IP. NANE RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
BUBJECT:
Submits addi ink'o 8< requests concurrence re compliance v/
requirements in NUREG-0737 Section II. F. 1> Attachments 1> 2 3 conceT ning radiation monitoring sos.
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T}'}I Action Plan Rgmt NUREG-0737 5 NUREG-0660 NOTES:
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INDIANA& MICHIGAN ELECTRIC COMPANY P.O. BOX I6631 COLUMBUS, OHIO 43216 March 6, l987 AEP:NRC:0678AD Donald C.
Cook Nuclear Plant Unit Nos.
1 and 2
Docket Nos.
50-315 and 50-316 License Nos.
DPR-58 and DPR-74 NUREG-0737, SECTION II.F.1 ADDITIONAL INFOR."fATION ON RADIATiON MONITORiNG SYSTEM U.S. Nuclear Regulatory Commission Attn:
Document Control Desk Washington, D.C.
20555
Dear Sirs:
The purpose of this letter is to provide further information and request concurrence from you with regard to our compliance with certain requirements found in NUREG-0737,Section II.F.1, Attachments 1,
2, and 3.
Our consultant has completed the primary calibration for the Eberline SPING 3/4 Radiation Monitoring System which is used for noble gas effluent monitoring in accordance with NUREG-0737,Section II.F.1,..
In summary, our radiation monitoring system has a total operating range of 5.8 E-7 to 1.6 E+4 uci/cc (dose equivalent Ze-133) at a time of 15 minutes post accident with a minimum of one decade overlap between detectors throughout the first 31 days post accident.
The range expands to 7.0 E-7 to 1.5 E+5 uci/cc at 31 days post accident while still maintaining a one-decade overlap between detectors.
After 33
- days, the overlap between the low and mid-range detectors decreases to "';
less than one decade.
This trend continues to a point at approximately 75 days post accident where Kr-85 is dominant and there is no overlap.
NUREG-0737,Section II.F.1, Attachment 2 requires the D.
C.
Cook Plant to have the capability to maintain isokinetic flow conditions with variations in duct design flow velocity of + 20$ for iodine/particulate sampling.
Our present system for sampling the unit vent effluents has this capability.
- However, the flow control device for adjusting the sample flow is manually operated and located in an area that could be subjected to hazardous levels of radiation during an accident and thus could be an ALARA concern.
e 8703160131 870306 PDR ADOCK 05000315 P
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AEP:NRC:0678AD Using the guidelines provided in ANSI 13.1, we performed an analysis for anisokinetic sampling for our system.
We assumed for this analysis that the unit. vent flow is at 100% of its design flow rate but that the sample flow is set at a constant flow rate to achieve approximate isokinetic conditions at 808 of the unit vent design flow.
The results indicate that the error due to anisokinetic sampling at these settings would be approximately one percent.
Since there is an ALARA concern for manually adjusting the flow control device, and since it would be costly to automate the flow control device to achieve such a small accuracy margin, we request your concurrence to set the sample flow regulator that will be used only in an accident mode at a constant flow rate to achieve approximate isokinetic conditions at 80% of the unit vent flow rate.
NUREG-0737,Section II.i'.1, Attachment 3 requires our containment high-range radiation monitors to have certified calibration of each de)ector for at least one point per decade of range between 1R/hr and 10 R/hr.
In reviewing our vendor's calibration certifications, it was noted that the vendor tested each detector for one point per decade of the range between 10 R/hr and 10 R/hr.
Since these detectors are designed for extremely high levels of radiation, it is our opinion that they have been properly tested and meet the intent of NUREG-0737.
We request your concurrence regarding this matter.
This document has been prepared following Corporate procedures which incorporate a reasonable set of controls to insure its accuracy and completeness prior to signature by the undersigned.
Very truly yours, I
M. P. Alexzch Vice President cm Attachments cc:
John E. Dolan W.
G. Smith, Jr.
- Bridgman R.
C. Callen G. Bruchmann G. Charnoff NRC Resident Inspector
- Bridgman J.
G. Keppler
- Region III
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