ML073400167
| ML073400167 | |
| Person / Time | |
|---|---|
| Site: | Plum Brook |
| Issue date: | 11/29/2007 |
| From: | US National Aeronautics & Space Admin (NASA) |
| To: | NRC/RGN-III/DNMS/DB |
| References | |
| EP-HPT-105 | |
| Download: ML073400167 (13) | |
Text
Survey Unit Release Record I I Design # I EP-HPT-105
/ Revision#
I Original I Page 1 of 3 I Suwey Unit #(s) Description HPT- 105 1) Embedded Pipe (EP) Survey Unit HPT-105 meets the definition of embedded pipe for Plum Brook Reactor Facility (PBRF). 2) EP HPT-105 is a Class 1, Group 3.1 survey unit as per the PBRF Final Status Survey Plan (FSSP) and Technical Basis Document (TBD)-06-004.
- 3) Surveys in EP HPT-105 were performed using a scintillation detector optimized to measure gamma energies representative of Cs-137. Sample #EP 3-8 hm Survey Request (SR)-13 was referenced for this decision.
- 4) Survey Instructions for this survey unit are incorporated into and performed in accordance with (LAW) the Babcock Services Incorporated (BSQtLVS-002, Work Execution Package (WEP)05-006. Survey instructions described in this document constitute "Special Methods" and the survey design used in the acquisition of survey measurements.
- 5) Instrument efficiency determinations are developed in accordance with the BSWS-002, WEP 05-006, these determinations are appropriate for the types of radiation involved and the media being surveyed.
Technical Reviewer CS-0911 Approval Signatures Date:
FSS Design # EP HPT-105 Revisi on # Original Page 2 of 3 Survey Unit: HPT-105 1.0 History/Description 1.1 The subject pipe system is a 4" drain line located in the Hot Pipe Tunnel at the -10' el.
1.2 EP HPT-105 consists of 4" diameter piping that is approximately 25 feet in length.
2.0 Survey Design Information 2.1 EP HPT-105 was surveyed IAW Procedure #BSI/LVS-002.
2.2 100% of the 4" ID pipe was accessible for survey. The accessible 4" ID pipe was surveyed by static measurement at one foot increments, for a total of 25 survey measurements.
2.3 The total surface area for the 4" ID piping is 24,322 cm 2 (2.4 m 2) for the entire length of (approxima tely 25') of 4" piping.
3.0 Survey Unit Measurement Locations/Data 3.1 Pipe interior radiological survey forms are provided in Attachment 2 of this release record.
4.0 Survey Unit Investigations/Results 4.1 None 5.0 Data Assessment Results 5.1 Data assessment results are provided in the EP/Buried Pipe (BP) Survey Report provided in Attachment 1.
5.2 All measurement results are less than the Derived Concentration Guideline Level (DCGL) for radionuclide specif ic EP that corresponds to the 1 mrem/yr dose goal established in Table 3-3 of the FSSP.
5.3 When implementing the Unity Rule, provided in Section 3.6.3 of the FSSP, and applying the Nuclide Frac tion (NF), provided in TBD-06-004, the survey unit that is constituted by EP HPT-105 passes FSS.
5.4 Background was not subtracted from the survey measurements and the Elevated Measurement Comparison (EMC) was not employed for this
survey unit.
FSS Design # EP HPT-105 Revisi on # Original Page 3 of 3 Survey Unit: HPT-105 5.5 Statistical Summary Table Statistical Parameter 4" Pipe Total Number of Survey Measurements 25 Number of Measurements >MDC 25 Number of Measurements Above 50% of DCGL 0 Number of Measurements Above DCGL 0 Mean 0.0071 Median 0.0074 Standard Deviation 0.0024 Maximum 0.0135 Minimum 0.0032 6.0 Documentation of evaluations pertaining to compliance with the unrestricted use limit of 25 mrem/yr and dose contributions from Embedded Pipe and radionuclides contributing 10% in aggregat e of the total dose for both structural scenarios and soils.
6.1 A review of the survey results has shown that the dose contribution for EP HPT-105 to be less than 1 mrem/yr. The dose contribution is estimated to be 0.007 mrem/yr based on the average of the actual gross counts measured.
7.0 Attachments Attachment 1 - BSI EP/BP Survey Report Attachment 2 - Pipe Interior Radiological Survey Form Attachment 3 - DQA Worksheet Attachment 4 -Disc containing RR for EP HPT-105 & Spreadsheet SECTION 7 ATTACHMENT 1 z, PAGE(S)
EP HPT-105 4" Pipe TBD 06-004 Group 3.1Measurement #gcpmncpm Cs-137 activity (total dpm)
Cs-137 activity (dpm/100cm2)
Co-60 activity (dpm/100cm2)
Eu-152 activity (dpm/100cm2)
Eu-154 activity (dpm/100cm2)
Nb-94 activity (dpm/100cm2)
Ag-108m activity (dpm/100cm2)
Unity13434141,667 14,562 893 - 60 - - 0.00822626108,333 11,135 683 - 46 - - 0.0063232395,833 9,850 604 - 40 - - 0.0054232395,833 9,850 604 - 40 - - 0.00554040166,667 17,131 1,050 - 70 - - 0.00963535145,833 14,990 919 - 61 - - 0.0087151562,500 6,424 394 - 26 - - 0.0038141458,333 5,996 368 - 25 - - 0.0039181875,000 7,709 473 - 32 - - 0.004102727112,500 11,564 709 - 47 - - 0.006112424100,000 10,279 630 - 42 - - 0.005123333137,500 14,133 866 - 58 - - 0.007132828116,667 11,992 735 - 49 - - 0.006142828116,667 11,992 735 - 49 - - 0.006153737154,167 15,846 971 - 65 - - 0.008164040166,667 17,131 1,050 - 70 - - 0.009173737154,167 15,846 971 - 65 - - 0.008183434141,667 14,562 893 - 60 - - 0.008193030125,000 12,848 788 - 53 - - 0.007203434141,667 14,562 893 - 60 - - 0.00821202083,333 8,566 525 - 35 - - 0.005226060250,000 25,697 1,575 - 105 - - 0.014234747195,833 20,129 1,234 - 82 - - 0.011244343179,167 18,416 1,129 - 75 - - 0.010253939162,500 16,703 1,024 - 68 - - 0.009MEAN0.007MEDIAN0.007STD DEV0.002 MAX0.014MIN0.003 1 of 1 SECTION 7 ATTACHMXNT 2 3 PAGE(S) a BSVLVSPipeCrawler-002 Revision 5 Pipe Interior Radiological Survey Form Date: 11 15. 07 Time: 1013- pipe ID#: /f$'f - 10s Pipe Diameter:
Y" Access Point Area: Building:
- T Elevation: - System: Type of Survey Investigation Characterization Final Survey Other J Gross cs J Detector ID# I Sled ID# 44/67 Detector Cal Date:
/6 Detector Cal Due Date: /b ON 08 Instrument: - Instrument ID #. 203438 Instrument Cal Date: Id. llCf 07 Instrument Cal Due Date: /b r>&r 08 From the Daily Pipe Survey Detector Control Form for the Selected Detector Background Value 6. 1 cpm MDC~,~, 11. ~a. cpm Efficiency Factor for Pipe Diameter 0 goo Z 4 @om detector efficiency determination]
MDCShti, dpml I fYD cm2 Is the MDC.,.,, acceptable?
NO (if no, adjust sample count time and recalculate MDCL&) Comments:
Technician Signature
\ Pipe Interior Radiological Suwey 'd Package Page 1 o 13 - REFERENCE COPY Attachment 3, Page 1
- BSLZVSPipeCrawler-002 Revision 5 Pipe Interior Radiological Survey Form (Continuation Form) Date: II-15.07 . / 4 Pipe ID#: Q 1 - ( 0 5 Pipe Diameter:
Access Point Area: Building:
WT Elevation:
.- System: Package Page - 2 of 3 REFERENCE COPY Attachment 3, Page 2
SECTION 7 ATTACHMENT 3 I PAGE(S)
Page 1 of 1 SECTION 7 ATTACHMENT 4 1 DISC