ML073330644
| ML073330644 | |
| Person / Time | |
|---|---|
| Site: | Plum Brook File:National Aeronautics and Space Administration icon.png |
| Issue date: | 11/15/2007 |
| From: | US National Aeronautics & Space Admin (NASA) |
| To: | NRC/RGN-III/DNMS/DB |
| References | |
| EP-CRT-4 | |
| Download: ML073330644 (12) | |
Text
Description t- Survey Unit Release Record wgn# EP-CRT-4 Revision # Original Pap 1 of 3 Suwey Unit #(s) CRT-4 1) Embedded Pipe @P) Survey Unit CRT-4 meets the ddnitian of embedded pipe for Plum Brook Reactor Facility (PBRF). 2) EP CRT4 is a Class 1, Group 1 survey unit as per the PBRF Final Status Survey Plan @SSP) and Techid Basis Document (~D~. 3) Surveys in EP CRT-4 were performed using a scintillation detm optima to measure gamms energies representative of MO. Sample #EP 3- 9 from Survey Request (SR)-13 was referenced fbr this decision.
- 4) Survey Instructions for this survey unit are incorporated into and performed in ac~ordance with (TAW) the Babmk Services lncorporsted (BSx)JLVS-002, Work Execution Package (WFiP)05-006. Survey instructions demibed in this document constitute "S@ Methods" and the survey design used in the acquisition of suntey measurements.
- 5) hk~ment efficiency determidons are developed in accu~ with the BSULVS-002, WEP 05-006, these determinations we appropriate for the types of radiation involved and the media being weyed.
Page 2 of 3 Smy Unit: CRT-4 LO HktoryDescription 1.1 The subject pipe system is a 2.5" dieter penetration located on the CRT plate within the. Sub Pile Room. The system access point is located on the -34' el. of the Rx building.
1.2 EP CRT-4 consists of 2.5" diameter piping that is approximately 3 feet in 1-a 2.0 Swey Design lafamation 2.1 EP CRT-4 was surveyed IAW Procedure
- BSvLvs-002.
2.2 1W/o of the piping was accessible for survey, The acceshlihb pipe was surveyed by static mamement at one foot increments, for a total of 3 survey measurements.
2.3 The total stdm area for the piping system is appoximrttely 1,824 m? (0.2 m2) for the dre length of (3') of piping. 3.0 Survey Unit Measurement
~on~ata 3.1 Pipe interior radiological mey forms are provided in Attachment 2 of this release record. 4.0 Survey Unit Investigationdlksults 4.1 None 5,0 Data Assessment Remits 5.1 Data assessment resubs are provided in the EPIBuried Pipe @P) Survey Report provided in Attachment
- 1. 5.2 All measurement results am less than the Med CaMan Guidehe Level (DCGL,) for radionuclide specific EP that wmqmds to the 1 mdyr dose god established in Table 3-3 of the FSSP. 5.3 When implementing the Unity Rule, provided in Section 3.6.3 of the FS SP, and applying the Nuclide Fdon 0, provided in TBM-004, the survey unit that is constituted by EP CRT-4 passes FSS. 5.4 Biwkgmund was not subtmcted from the my measurements and the Elevated Measurement Comparison
@MC) was not mployed for this survey unit.
Maximum 10.1219 FSS Design # EP CRT-4 Minimum 0-QQOO Survey unit: CRT4 5.5 StatisticalSummaryTable 6.0 Documentation of evaluations pertaining to compliance with the &cEed use limit of 25 Wyr and dose contributions hm Embedded Pipe and radlomcIidcs contributing 1% in aggregate of the total dose for both structural dos and soils. 6.1 A review of the survey results has sham that the dose contribution for EP CRT-4 to be leas than 1 &yr. The dose cantribution is athated to be 0.046 dyr based on the amage of the actual gross counts measured.
7.0 Attachments Attachment 1 - BSI EPBP Survey Report Attachment 2 - Pipe Interior aadiological Survey Form Attacbtnerrt 3 - DQA Work&- Atkhmmt 4 -Disc containing RE1 fbr EP CRT-4 & Spreadsheet L Revision # Origind Page 3 of 3 SECTION 7 ATTACHMENT 1 ?- PAGES BSI EPIBP SURVEY REPORT COMMENTS:
ACTIVITY VALUES NOT BACKGROUND CORRECTED RP Engimr I Date //-I2 - 07
SECTION 7 ATTACHMENT 2 2 PAGE(S)
-- BSVLVSPipeCrawler-002 Revision 5 Pipe Interior Radiological Survey Form Time: r d3Y -. PipriD#: CKe;$ PipeDiameter:
1.5' Access paint ha: Building:
Elevation:
-3y System: Type of Sunfey Il~vestigation Characterization Final Survey X Other J Gross COGO J Cs Detector D# 1 Sled ID# \b /ws-\ %J Detector Cal Date: \--\\-h-)
Detector Cal Due Date: \ -\\- 08 Instrument:
2350-1 ~nstrume~~t ID #: 1 Sq W-\ Instrument Cal Date: \ -1 1- 07 Instrument Cal Due Date: J -\\ -01 From the Daily Pipe Survey Detector Control Form for the- Selected Detector Background Value 3 ,LC cpm mmtatic lo cpm Efficiency Factor for Pipe Diameter b,0 003~ (fiorn detector efficiency determination)
MDCwic 3427 dpm/, cm2 Is the MDCSMae'acceplable?
NO (if no, adjust sample count time and recalculate MDCRgtaiC)
Comments:
post CLLO~ t003b COWD~.~, Technician Signature Pipe Interior Radiological Survey REFERENCE COPY Package Page 1 of 2, Attachment 3, Page 1 REFERENCECOPY I-\
SECTION 7 ATTACHMENT 3 , , , PAGE@)
)I ) Check megt Design # EP CRT-4 Revision # Original survey Unit # EP-CRT-4 > > 7 7 Prefimirxarg Oata FP&iavrr' Answers to the following questions should be fully documented in the Survey Unit Release Record Yes No MA 1. Have surveys been performed in accordance with survey instructions In the Survey Deslgn? X 2 Is the instrumentation MDC for structure static measurements below the DCGh for Class 1 and 2 survey units, or bdow 0.5 DCGLw for Class 3 survey units? X 3. Is the ~nstmrnentatim MDC for mbeddedlburied piping static measurements below the DCGLw ? X 4. Was the instrumentation MDC for structure scan measurements, soil scan measurements, and embeddedburied piplng scan measurements below the KGh, or, if not, was the need for additional X static measurements or soil samples addressed in the survey design? 5 Was the ~nstrurnentafion MDC for volumetric measurements and smear analysis c 10% DCGLw ? X 8. Were the MDCs and assumptions used to develop them appropriate for the instruments and techniques
' used to perform the survey7 7 Were the survey methods used to collect data proper for the types of radrat~on involved and for be media being surveyed?
X 8 Were 'Sp8cial M&hodsn for data collection properly appl~ed for the survey unit under review? X 9. Is the data set comprised of qualified measurement results collected In accordance with the survey design, which accurately reflects Me radiological status of the faclllty?
X CS4912 Page 1 of 1 SECTION 7 ATTACHMENT 4 1 DISC