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 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~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 ) h k ~ m e n t efficiency determidons are developed in a c
c u
~
with the BSULVS-002, WEP 05-006, these determinations we appropriate for the types of radiation involved and the media being w e y e d.
Page 2 of 3 S m y Unit: CRT-4 L O 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 S w e y 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 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 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 F d o n 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 m y
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 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 0.046 d y
r based on the amage of the actual gross counts measured.
7.0 Attachments - BSI EPBP Survey Report - 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 d 3 Y PipriD#:
CKe;$
PipeDiameter:
1.5' Access paint h a :
Building:
Elevation:
- 3 y 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:
\\ - \\ \\ - 0 8 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 mmtatic lo cpm Efficiency Factor for Pipe Diameter b,0 0 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 C L L O ~
t 0 0 3 b C O W D ~. ~,
Technician Signature Pipe Interior Radiological Survey REFERENCE COPY Package Page 1 of 2,, 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 M A
- 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 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 ~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 b e 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