ML073110342
| ML073110342 | |
| Person / Time | |
|---|---|
| Site: | Plum Brook |
| Issue date: | 10/31/2007 |
| From: | US National Aeronautics & Space Admin (NASA) |
| To: | NRC/RGN-III/DNMS/DB |
| References | |
| EP-Rx 151D | |
| Download: ML073110342 (13) | |
Text
I Survey Unit Release Record I I Design # I EP-Rx 151D / Revision#
I Ori@ 1 Page 1 of 3 1 Survey Unit #(s) Description
- 1) Embedded Pipe (EP) Survey Unit RX 151D meets the definition of embedded pipe for Plum Brook Reactor Facility (PBRF). 2) EP RX 15 1 D is a Class I, Group 2 survey unit as per the PBRF Final Status Survey Plan (FSSP) and Technical Basis Document (TBD)-06-004.
- 3) Surveys in EP RX 15 1D were performed using a scintillation detector optimized to measure gamma energies representative of (20-60. Sample #EP 2-1 from Survey Request (SR)-13 was referenced for this decision.
- 4) Survey Instructions for this survey unit are incorporated into and performed in accordance with (IAW) the Babcock Services Incorporated (BSI)/LVS-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) Instnunent efficiency determinations are developed in accordance with the BSIILVS-002, WEP 05-006, these determinations are appropriate for the types of radiation involved and the media being surveyed.
FSS Design
- EP Rx 15i~ Revision # Original Page 2 of 3 Survey Unit: Rx 151D 1.1 The subject pipe system is a 0.75" spare drain line for Quad "B 1.2 EPRX151Dis15feetinlength.
2.0 Survey
Design Information 2.1 EP RX 151D was surveyed IAW Procedure
- BSI/LVS-002.
2.2 100% of the 0.75" pipe was accessible for survey. This accessible 0.75" pipe was surveyed by static measurement in one foot increments, for a total of 15 survey measurements.
2.3 Surface
area for the 0.75" piping is 182 cm2 for each foot of piping, corresponding to 2,73 cm2 for the 15' of 0.75" piping.
2.4 Total
surface area for EP RX 151D is 0.27 m2. 3.0 Survey Unit Measurement LocationslData 3.1 Pipe interior radiological survey forms are provided in Attachment 2 of this release record. 4.0 Survey Unit InvestigationslResults 4.1 None 5.0 Data Assessment Results 5.1 Data assessment results are provided in the EPiBuried Pipe (BP) Survey Report provided in Attachment
- 1. 5.2 All measurement results are less than the Derived Concentration Guideline Level (DCGL) for radionuclide specific EP that corresponds to the 1 mremiyr 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 Fraction (NF), provided in TBD-06-004, the survey unit that is constituted by EP RX 151D 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.
5.5 Statistical
Summary Table - Statistical Parameter FSS Design# EP Rx 151D 6.0 Documentation of evaluations pertaining to compliance with the unrestricted use limit of 25 mredyr and dose contributions from Embedded Pipe and radionuclides con&buting 10% in aggregate of the total dose for both structural scenarios and soils. Survey Unit: Rx 151D Revision # Original 6.1 A review of the survey results has shown that the dose contribution for EP Rx 15 1 D to be less than 1 mremlyr. The dose contribution is estimated to be 0.042 mremlyr based on the average of the actual gross counts. Page 3 of 3 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 Rx 1.51D & Spreadsheet SECTION 7 ATTACHMENT 1 2 PAGES BSI EPlBP SURVEY REPORT Survey Locatlon -27' Trench Spare Drain DetectorSled
- Detector Efficiency Field MDCRppnr LUES NOT BACKGROUND CORRECTED RP Engineer I Date EP RX 151D 0.75" Pipe TBD 06-004 Group 2 SECTION 7 ATTACHMENT 2 3 PAGES
- BSULVSPipeCrawler-002 Revision 5 Pipe Interior Radiological Survey Form Date: 1 b 07 Time: 1s 56 Pipe ID#: (k \ !S \ 0 Pipe Diameter: - 7 5 " Access Point Area: Building:
nl b\ A% Elevation:
-=&-la System: Type of Survey Investigation Characterization Fmal Survey % Other ,I Gross C06O d Cs DetectorJD#ISledID#
~0/9.51~/00q7 1 do skd Detector Cal Date: 07 Detector Cal Due Date: 4- (I.\- 0 Instrument:
2350- \ Instrument ID #: 20*3L.\L g Instrument Cal Date: q -1 '-\ 1 Instnunent Cal Due Date:
q - '\ - bS From the Daily Pipe Survey Detector Control Form for the Selected Detector Background Value 3 , 8 cpm MDCRstatlc 1392. cpm Efficiency Factor for Pipe Diameter D- Omb (from detector efficiency determination)
MDCs,t,c w4a dpml 19~ Is the MDCsk,, acceptable?
&~(lf~adJUSt sample count tune and recalculate MDCaJ Comments:
Po&+ a,, ,, w 2-1 Technician Sirnature a Pipe Interior Radiological Survey RBPERENCE COP Package Page 1 of 5 Atteechment 3, Pa@-
BSVLVSPipeCrawler-002 Revision 5 Pipe Interior Radiological Survey Form (Continuation Form) Date: lo -a?- 03 Pipe ID#: rz/ \s\ 0 Pipe Diameter: ,T 5 " Access Point Area: funp Kfi Tk'tn~h Building:
& QL~L Elevation: - a7 ' System: &jcr& 1.8 h Package Page of 3 Athachment 3, Page 2
SECTION 7 ATTACHMENT 3 1 PAGE Page 1 of 1 SECTION 7 ATTACHMENT 4 1 DISC