ML20049J315
| ML20049J315 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 03/08/1982 |
| From: | Bordine T CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, RTR-REGGD-01.003, RTR-REGGD-1.003, TASK-2.F.1, TASK-TM NUDOCS 8203150046 | |
| Download: ML20049J315 (3) | |
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O Consumers Power Company oeneral off kes-212 West Michtgen Avenue, Jackson, MI 49201 *(517) 788-0550 March 8, 1982
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D REC:rg f Dennis M Crutchfield, Chief g
f,jg 13 ;gg fa Operating Reactors Branch No 5
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Nuclear Reactor Regulation u naux;g US Nuclear Regulatory Commission 6
8 Washington, DC 20555 d
% lI" DOCKET 50-155 - LICENSE DPR BIG ROCK POINT PLANT - RESPONSE TO NUREG-0737 ITEM II.F.1(3) -
CONTAINMENT HIGH RANGE MONITOR By letter dated February 2, 1982 the NRC requested that Consumers Power Company provide certain additional information in order for the NRC staff to complete its review of Consumers Power Companys proposed actions in regard to NUREG-0737 Item II-F.1(3), Containment High Range Monitors. Specifically, the information requested an outline of the method Consumers Power Company will use to correct the readings of the radiation monitors, which are located out-side of the containment shell, to correspond to the actual dose rates inside containment as a function of time and isotopic composition. This outline was to include the method Consumers Power Company would use both before and after containment atmosphere sample results are available.
In addition, it is the intent of this letter to provide an update of our response to this NUREG item as a result of vendor delivery delays of the calibration source.
A computer analysis was performed to obtain the dose rate at both the monitor and at the centerline of containment ac a function of time.
For a source with j
the composition specified in Regulatory Guide 1.3 at the start of a postulated l
accident, the analysis provided the following correction factors:
(1) from the onset of the postulated accident until the end of the first day the con-tainment dose rate is a factor of 8 above the monitor reading, (2) the factor increases to 15 from the end of the first day until the end of the 10th day and then (3) falls to a constant value of 10.
These factors account for changes in isotopic composition over the course of the accident, and will be utilized (as a continuous curve from t=0 to t=30 days) to correct the outside readings to give containment centerline dose rates.
By letter dated March 31, 1981, Consumers Power Company submitted to the NRC 5
the Probabilistic Risk Assessment (PRA) for Big Rock Point. Attachment 3 to
/O oc0382-0010a142 8203150046 820308 PDR ADOCK 05000155 P
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D M Crutchfield, Chief 2
Big Rock Point Plant NUREG-0737 Item II.F.1(3)
March 8, 1982 that submittal provided Consumers Power Company's reasons for deferring post accident containment air sampling.
By letter dated August 12, 1981 the NRC agreed to defer the requirement for an atmospheric sampling system until the completion of the review. process for the PRA.
Consumers Power Company submittal dated July 9, 1981 on NUREG-0737 Item II.F.1 for Big Rock Point, outlined our plan for using a vendor modified source of 400 mill l curies Cs-137 to calibrate the containment high-range radiation monitors.
The vendor has informed us of an approximate six month delay in the delivery of this calibration source due to the required licensing process. A license to sell the source in the modified configuration is currently being pursued by the vendor.
The containment high-range radiation monitors were calibrated prior to shipment to the Big Rock Point Plant (calibration certification attached) and is certified to remain in calibration for a period of eighteen months. Pend-ing NRC issuance of the vendors license and receipt of the Cs-137 source, Consumers Power Company will utilize the vendor certification process.
It is anticipated that we will receive the calibration source prior to the expira-tion date of the vendor calibration and the next refueling outage.
It should be noted that our technical specification change submittal dated December 15, 1981 requires calibration at each refueling outage.
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Thomas C Bordine Staff Licensing Engineer CC Administrator, Region III, USNRC NRC Resident Inspector-Big Rock Point I page oc0382-0010a142
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VICTOREEN, INC.
10101 WOODLAND AVE., CLEVELAND. oNio 44104 VICTO A EEN
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October 21, 1981 Mr. J. H. Pressel Project Manager Gil bert/ Commonweal th 209 E. Washington Avenue Jackson, Michigan 49201
REFERENCE:
Big Rock Point P.O. #1000-5870-Q Palisades P.O. #1000-5871-Q
Dear Mr. Pressel:
This is to certify that the Model 875 High Range Containment Monitor System was calibrated when shipped from Victoreen, and will remain within calibration tolerance for a period of eighteen (18) months.
VICT0REEN, INC.
K. E. Stafford Manager, Quality Assurance KES:rs cc: Big Rock - S.0.390021 Palisades - S.O.390022 prm mMD A $We' OCDe CO'DO'St On $wD10@