ML073110363
| ML073110363 | |
| 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-RPHD-1 | |
| Download: ML073110363 (13) | |
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Survey Unit Release Record Design # EP-RPHD- 1 Revision # Original Page 1 of 3 S u m y Unit #(s) RPHD- 1
- 1) Embedded Pipe @P) Survey Unit RPHD-1 meets the definition of embedded pipe for Plum Brook Reactor Facility (PBRF).
- 2) EP RPHD-1is a Class 1, Group 1 survey unit as per the PBRF Final Status Survey Plan (FSSP) and Technical Basis Document (TBD)-06-004.
- 3) Surveys in EP RPHD-1 were performed using a scintiilation detector optimized to measure gamma energies representative of Co-60. Sample #EP3-7 from Survey Request (SR)-13 was referenced for this decision.
- 4) Survey Instmctions for this survey unit are incorporated into and performed in accordance with (IAW) the Babcock Services Incorporated (BS1)LVS-002, Work Execution Package (WEP)05-006. Survey instructions described in this Description document constitute "Special Methods7'and the survey design used in the acquisition of survey measurements.
- 5) Instrument efficiency determinationsare developed in accordance with the BSyLVS-002, WEP 05-006, these determinations are appropriate for the types of radiation involved and the media being surveyed.
I FSS Design # EP RPHD-1 I Revision # Original Page 2 of 3 Survey Unit: RPHD-1 1.0 History/Description 1.1 The subject pipe system is the 4" line running h m the Resin Pit -10'.
1.2 EP RPHD-1 consists of 4" diameter piping that is approximately 17 feet in length.
2.0 Survey Design Information 2.1 EP RPHD-I 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 17 survey measurements.
2.3 Surfkce area for the 4" ID piping is 973 cm2for each foot of piping, corresponding to a total 4" ID piping surface area of 16,539 cm2(1.7 mZ) for the entire length of (approximately 17') of 4" piping..
3.0 Survey Unit Measurement LocatioWata 3.1 Pipe interior radiological survey forms are provided in Attachment 2 of this release record.
4.0 Survey Unit InvestigationdResults 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 specific EP that corresponds to the 1 mredyr 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 RPHD-1 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 RPHD-1 Revision # Original Page 3 of 3 Survey Unit: RPHD-1 5.5 Statistical Summary Table 6.0 Documentation of evaluations pertaining to wmpliaace with the unrestricted use limit of 25 mremlyr and dose contributions from Embedded Pipe and radionuclides contributing 10% in aggregate of the total dose for both e t r u c h d scenarios and soils.
6.1 A review of the survey results has shown that the dose contribution for EP RPHD-1 to be less than 1 mrem/yr. The dose contribution is estimated to be 0.325 mremlyr based on the average of the actual gross counts measured.
7.0 Attachments Attachment 1- BSI EPBP Survey Report Attachment 2 -Pipe Interior Radiological Survey Form Attachment 3 - DQA Worksheet Attachment 4 -Disc containing RR for EP RPHD-1& Spreadsheet
SECTION 7 ATTACHMENT 1 z PAGE(S)
BSI EPlBP SURVEY REPORT Detector3kfIt ACTIVIN VALUE RP Engineer I Date
EP RPHD-I 4" Pipe TBD 06.004 Group 1
SECTION 7 ATTACHMENT 2 3 PAGE(S)
~ ~ ~ ~ ~ ~ ~ i ~ e C r a w Revision 4 Pipe Interior Radiological Survey Form Date: 611 3,/66 Time: 0 8 37 PipeID#: R PHe I -
Building: ~'i;s,/rr PI j-Pipe Diameter:
Elevation: - 10' I,
Access Point Area:
System:
Z ~ I N /C)1
/
Type of Survey Investigation Characterization Final Suhrey 7d Other u
Gross C06O / Cs Uetector l U m LUK C~W 5~
L%Y
- i jGj Detector Cal Date: 3/1 /06 Detector Cal Due Date: 3 / 6 , ! ~ 7.-
Instrument: 2 3 m-! Instrument ID #: 203 k I1 -- .
From the Daily Pipe Survey Detector Control Form for the Selected Detector BackgroundValue 7
- 12. cpm mcIg,c 1s. 2 cPm Efficiency Factor for Pipe Diameter 0 coo= (from detector efficiency determination)
MDCshhc Is the MDCstaticacceptable? &
E r(-$dujst ymple count ilme andiecalculate MD-)
Comments: k f l , S~RVW EP3- 7 / A~~
Technician Signature Pipe Interior Radiological Survey
. . Package Page 1 of - 3 REFERENCE COP Attachment 3, Page 1
Pipe ID#: +
Building: && Pr Pipe Interior Radiological Survey Form (Continuation Form)
Date:
Pipe Diameter:
Elevation: -18' f
' s s m s ~ m o 2 -
Access Point Area:
System:
Revision 4 RES,& f l r Package page &f 3 Attachment 3. Page 2
SECTION 7 ATTACHMENT 3 I PAGE(S)
Page 1 of 1 SECTION 7 ATTACHMENT 4 1 DISC