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
t-Survey Unit Release Record wgn# EP-CRT-4 Revision # Original P a p 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 T e c h i d Basis Document ( ~ D ~ .
- 3) Surveys in EP CRT-4 were performed using a scintillation d e t m o p t i m a to measure gamms energies representative of M O . 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~ordancewith (TAW) the Babmk Services lncorporsted (BSx)JLVS-002, Work Execution Package (WFiP)05-006. Survey instructions demibed in this Description document constitute "S@ Methods" and the survey design used in the acquisition of suntey measurements.
5 ) h k ~ m e nefficiency t determidons are developed in a c c u with ~ the BSULVS-002, WEP 05-006,these determinations we appropriate for the types ofradiation involved and the media being w e y e d .
Page 2 of 3 S m y 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. ofthe Rx building.
1.2 EP CRT-4 consists of 2.5" diameter piping that is approximately 3 feet in 1a-2.0 S w e y Design lafamation 2.1 EP CRT-4 was surveyed IAW Procedure #BSvLvs-002.
2.2 1W/oof 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?
(0.2m2)for the d r e length of(3') of piping.
3.0 Survey Unit Measurement ~ o n ~ a t a 3.1 Pipe interior radiological m e y 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 M e d C a M a n Guidehe Level (DCGL,) for radionuclide specific EP that w m q m d s 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 ofthe FSSP,and applying the Nuclide F d o n 0, provided in T B M - 0 0 4 ,
the survey unit that is constituted by EP CRT-4 passes FSS.
5.4 Biwkgmund was not subtmcted from the m y measurements and the Elevated Measurement Comparison @MC) was not mployed for this survey unit.
FSS Design # EP CRT-4 Revision # Origind Page 3 of3 Survey unit:CRT4 5.5 StatisticalSummaryTable Maximum 10.1219 Minimum 0-QQOO 6.0 Documentation of evaluations pertaining to compliance with the &cEed use limit of 25 W y r and dose contributions h m Embedded Pipe and radlomcIidcs contributing 1% in aggregate of the total dose for both structural d o s 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 0.046d y r 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
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 h a :
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 S q W-\
Instrument Cal Date: \ -1 1- 0 7 Instrument Cal Due Date: J - \ \ -01 From the Daily Pipe Survey Detector Control Form for the-Selected Detector Background Value 3 ,LC cpm m m t a t ic lo cpm EfficiencyFactor for Pipe Diameter b,00 0 3 ~ (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 Package Page 1 of 2, REFERENCE COPY Attachment 3, Page 1
I-\
REFERENCECOPY
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 D C G h for Class 1 and 2 X
survey units, or bdow 0.5 DCGLw for Class 3 survey units?
- 3. Is the ~nstmrnentatimMDC 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 K G h , or, if not, was the need for additional X static measurements or soil samples addressed in the survey design?
5 Was the ~nstrurnentafionMDC 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~oninvolved and for b e X
media being surveyed?
8 Were 'Sp8cial M&hodsn for data collection properly appl~edfor the survey unit under review? X
- 9. Is the data set comprised of qualified measurement results collected In accordance with the survey X
design, which accurately reflects Me radiological status of the faclllty?
CS4912 Page 1 of 1
SECTION 7 ATTACHMENT 4 1 DISC