ML073170366
| ML073170366 | |
| Person / Time | |
|---|---|
| Site: | Plum Brook |
| Issue date: | 11/06/2007 |
| From: | US National Aeronautics & Space Admin (NASA) |
| To: | NRC/RGN-III/DNMS/DB |
| References | |
| EP CPT-16 | |
| Download: ML073170366 (13) | |
Text
I Survey Unit Release Record I Design # EP-CPT-16 Revision # Original Page 1 of 3 Suwey Unit #(s) CPT-16
- 1) Embedded Pipe @P) Survey Unit CPT-16 meets the definition of embedded pipe for Plum Brook Reactor Facility (PBRF).
- 2) EP CPT-16 is a Class 1, Group 4.1 survey unit as per the PBRF Final Status Survey Plan (FSSP) and Technical Basis Document (TBD)-06-004.
- 3) Surveys in EP CPT-16 were performed using a scintillation detector optimized to measure gamma energies representative of Cs-137. Sample #EP 4-4 e o m 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 Senices Incorporated (BSI)/LVS-002, Work Execution Package (WEP)05-006. Survey instructions described in this Description 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 BSIILVS-002, WEP 05-006, these determinations are appropriate for the types of radiation involved and the media being surveyed.
Approval Signatures Date:
FSS Design # EP CPT-16 Revision # Original Page 2 of 3 I Survey Unit: CPT-16 I 1.1 The subject pipe system is a 4" floor drain line located on the -27' el.
valve pit of the Rx building.
1.2 EP CPT-16 consists of 4" diameter piping that is approximately 21 feet in length.
2.0 Survey Design Information 2.1 EP CPT-16 was surveyed IAW Procedure #BSVLVS-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 21 survey measurements.
2.3 Surface area for the 4" ID piping is 973 cm2for each foot of piping, corresponding to a total 4" ID piping surface area of 20,430 cm2(2.0 mZ) for the entire length of (approximately 21') of 4" piping.
3.0 Survey Unit Measurement LocationsIData 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 EPBuried 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 CPT-16 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 CPT-16 Revision # Original Page 3 of 3 Survey Unit: CPT-16 5.5 Statistical Summary Table 6.0 Documentation of evaluations pertaining to compliance with the unrestricted use limit of 25 mredyr and dose contributions from Embedded Pipe and radionuclides contributing 10°?in aggregate 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 CPT-16 to be less than 1 mremlyr. The dose contribution is estimated to be 0.019 mredyr 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 CPT-16 & Spreadsheet
SECTION 7 ATTACWMENT 1 2 PAGE(S)
BSI EPlBP SURVEY REPORT bteatorakd #
Survey Unl Classifidion CTIVITYVALUES NOT BACKGROUND CORRECTED RP Engineer 1 Date
EP CPT-16 4" Pipe TBD 06-004 Group 4.1 lofl
SECTION 7 ATTACHMENT 2 3 PAGE(S)
BSIILVSPipeCrawler-002 Revision 4 Pipe Interior Radiological Survey Form 3/5/0 7 1304 Date:
Pipe ID#: Lpr- 104 (Lpr-/~)PipeDiameter:
Time:
II Access Point Area:
-I Building: E / c?r Elevation: - I System:
nm/us Type of Survey Investigation Characterization Final Survey % Other /
Gross C06O c sJ 7
Detector ID# 1Sled ID# 44-/ S9 2 3 8364 1 /O 1 Detector Cal Date: ~ / T / D6 Detector Cal Due Date:
Instrument: 2 3 D 1 - Instrument ID #:
Instrument Cal Date: 7 / >~/-/o L Instrument Cal Due Date:
From the Daily Pipe Survey Detector Control Form for the Selected Detector Background Value 6,Z cpm MDCRstattc l(.6 C P ~
Efficiency Factor for Pipe Diameter 0, OOO?~ (from detector efficiency determination)
MDCstatlc 7~b6 dpd \BD cm2 Is the MDCSrabc acceptable? @ NO ( ~no, f adjust sample count time and recalculate MDCLaC)
Comments: 1 ~ fit) E?4-4 LQMPLGTF PA rn
/
- A Technician Signature r- - /---
Pipe Interior Radiological Survey 3
Package Page 1 of -
Attachment 3, Page 1
BSULVSPipeCrawler-002 Revision 4 Pipe Interior Radiological Survey Form (Continuation Form)
Date:
Pipe Diameter: 4 fl Access Point Area: C P, Building:
I Elevation: - 15' System: btzCa;/n.j <
Package Page z o f 3 REFERENCECOPY Attachment 3, Page 2
SECTION 7 ATTACHMENT 3 1 PAGE(S)
Page 1 of 1 SECTION 7 ATTACHMENT 4 1 DISC