ML20196A393
| ML20196A393 | |
| Person / Time | |
|---|---|
| Site: | 07001113 |
| Issue date: | 11/24/1998 |
| From: | Vaughan C GENERAL ELECTRIC CO. |
| To: | Lamastra M NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9811270133 | |
| Download: ML20196A393 (4) | |
Text
,
. ~ -
GENuclear Energy
{-
Genwalfimnc Cornuny PO Ba.< 752 Wrinungmn. NC23J02 i
9!Q675 5000 l
November 24,1998 Document Control Desk ATTN: Mike Lamastra Mail Stop T 8-D-14 U.S. Nuclear Regulatory Commission Washington, D. C, 20555-0001 t
Subject:
CaF Area Survey & Release Plan-2
References:
(1) NRC License SNM-1097, Docket 70-1113 (2) Final Survey & Release Plan, Rev. 2,2/28/96 (3) Letter, KK McDaniel to RJ Reda,4/16/96 (4) Letter, CM Vaughan to MF Weber,3/20/98 (5) Letter, MF Weber to CM Vaughan,4/6/98 (6) " Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM)",12/97 (7) Draft Regulatory Guide (DG 4006)" Demonstrating Compliance with I,
l Radiological Criteria for License Termination", 8/98 (8) Letter, SP Murray to HM Astwood,10/8/98
Dear Mr,
Lamastra:
l Per our phone conversation on November 13,1998 and today, I am providing the answers to your questions concerning our CaF Area Survey and Release Plan.
2
- 1. Regarding Section 4.5.3 and the total number of samples to be taken, this section has been revised to provide a breakdown of the number of samples in each location.
l
- 2. Regarding the previous Section 4.5.3 indicating there would be approximately 1090 samples taken and the revised section indicating approximately 350, the revised number of samples is caused by the complete removal of soil in the affected area.
- 3. - Regarding the previous Section 4.5.3 indicating sample collection every 3 feet to a depth of 12 feet and the revised section indicating samples would be taken only to a depth of 36 inches, incremental samples every 3 feet are no longer possible because the soil has been removed.
9811270133 991124 3
PDR ADOCK 0700 3
t i
Document Control D:sk l
Nov::mber 24,1998
. Page 2
- 4. Regarding the previous Section 4.5.2 indicating samples will be taken 3 feet below the deepest indication of contamination in excess of 30 pCi/gm, this section has been revised to include this statement.
l As a result of these changes, attached is the revised page 8 to our Final Survey and Release Plan. Page 7 is also provided but has not changed since our 10/08/98 submittal. Both pages are being provided for your approval.
Please contact me on (910) 675-5656 if you would like to discuss this request further.
Sincerely, l
GE NUCLEAR ENERGY 2-k.y i
C. M. Vaughan i
l Manager Facility Licensing attachments i
cc:
CMV-98-035 DA Ayres - Region ll l^
I i
-.. - - - - - ~
~
i i
4 Final Status Survey and Release Plan l
For the Northoest CaF Storage Area Octc,ber 8,1998, Rev. 03 l
I
'4.3 Gamma Radiation Scanning Survey Open land surface scanning will be conducted using a 2" by 2" Nal detector and a i
scaler /ratemeter calibrated to provide a readout in counts-per-second (cps) using a Cs-137 source. The instmments will be operated in an audible mode during the scanning survey. The detector will be placed approximately six inches from the ground surface and personnel will swing the detector back and forth while i
advancing at a speed no greater than 0.5 meters-per-second. Personnel will follow paths in the affected area that are no greater than one meter apart. Only accessible areas within the affected area and a minimum of ten percent of the unaffected area will be covered in this manner. Survey personnel will identify i
and record the penmeter of any area where the alarm sounds and the maximum instrument response within each identified area.
Survey personnel will also record the instrument response at any location where an audible elevation in count rate can be distinguished.
l The sensitivity of this enaning technique will not be known unless soil samples l
from areas where measurements were recorded are analyzed. When those results become available, a statistical correlation may be made between surface soil j
activity and vanning measurements.
4.4 Exposure Rate Survey The exposure rate survey will be conducted using a 2" by 2" Nal detector with a raremeter calibrated for exposure rate ( R/h) using a Cs-137 source.
The instruments will be set-up to obtain a one-minute integrated exposure rate measurement. The detector will be placed on a support approximately one meter from the ground. A systematic series of measurements will be taken across the site such that accessible areas within the affected area is covered at five-meter l
intervals. Approximately 30 measurements will be obtained in the unaffected area. Additional measurements may be made at locations identified during the gamma radiation ranning survey.
The Project Health Physicist will generate a survey map prescribing the locations for the exposure rate survey based on the results of the gamma radiation vinning survey. A map or other document will be used to record the survey results.
4.5 Soll Sampling 4.5.1 hmnie Isations For the affected area, sampling locations will be determined using a triangular, five meter by five roeter by five meter, sampling pattern (Exhbit A-12). For surface ws.ter included in an affected area survey l
7
Final Status Survey and Release Plan For the Northwest CaF Storage Area November 24,1998, Rev. 04 unit, sediment samples will be taken using the same sampling pattern, without taking the body of water into consideration. Additional samples will be collected if warranted by the scanning survey, the exposure rate survey, or sampling results.
For the unaffected area, one surface sample will be taken from each ten by ten meter reference grid (Exhibit A-12). A judgmental approach will be used to deternune the sample location within each grid. Sample locations will be determmed by the Project Enviromnental Scientist. Unaffected areas will be reclassified as affected (and additional samples taken as specified for affected areas) if soil activity levels are determmed to exceed 75 percent of the release criteria (or 22.5 pCi/g).
4.5.2 Samnling Methods Surface (0 to 6 inches) soil samples will be obtained with a hand auger appropriate to the soil t collected in this manner,ype in the sampling area. If samples cannot be a scoop or shovel will be used. Samples will be homogenized. Aliquots will be removed and placed in appropriate containers for analyses.
Subsurface sediment (to a depth of approximately 36 inches below the deepest indication of contamination in excess of 30 pCi/gm.) soil sampling will be accomplished using hollow stem augers with a split-spoon sampler (fitted with a sand retaining device, as necessary) appropriate to the soil type in the sampling area.
The sampling device will be driven, retrieved and emptied from the sediment surface until the desired depth is reached.
Soil will be homogenized.
Aliquots will be removed and placed in appropriate containers for analyses.
4.5.3 Number of Samnles Approximately 346 soil samples will be collected as follows :
Affected Area 264 samples Excavated Overburden 48 samples Unaffected Area 34 samples 4.5.4 Comnositing Samnles Composite samples may be generated using aliquots taken from individual samples. In general, each composite sample will be comprised of no more than two to three separate aliquots.
Each aliquot will contain approximately the same volume of soil. Compositing will be performed 8