ML073330476
| ML073330476 | |
| 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-10 | |
| Download: ML073330476 (12) | |
Text
Survey Unit #(s)
Survey Unit Release Record
- 1) Embedded Pipe (EP) Survey Unit CRT-10 meets the dewion of embedded pipe fbr Plum Brook Ractor Facility (PBW).
Design #
- 2) EP CRT-1 0 is a Class 1, Group 1 survey unit as per the PBRF Final Status Survey Plan (FSSP) and Technid Basis Document (TBD)-O6-004.
- 3) Surveys in EP CRT-10 were performed using a scintillation detector opeimrzed to masure gounma energies representative of Co-60. Sample #EP 3-9 *om S w e y Request (SR)-
13 was referenced for this decision.
- 4) Survey Instructions for this survey unit are incorporated into and perfumed in accordance with ('I AW) the Bat>cock Sewices Incorporated @SzytVS-002, Work Execution Package (WEP)05-006. Survey instructions described in this document constitute "Special Methods" and the survey design used in the acquisition of survey measurements.
5 ) hstrument efficiency determinations are developad in accordance with the BSULVS-002, WEP 05-006, these determinations are appropriate for the types of radiation involved and the media being surveyed.
M i o n #
Approval Signatures Dae:
1 n r FSS/Chmc&izration Engineer Origind Technical Reviewer (FSSICW-tion Engineer)
Page X of 3
FSS Design # EP CRT-I 0 Survey Unit: CRT-10 1.0 History~ptim 1.1 The subject pipe system is a 2.5" diameter penetration lOC8ted on the CRT plate within the Sub Pile Room, The system access point is located an the
-34' el. of the Rx building.
I.2 EP CRT-10 consists of 2.5" diameter piping that is approximately 3 f;eet in length.
2.0 Survey Design Information 2.1 EPCRT-lOwass~f~eyedZAWProdm#BSI~VS-002.
2.2 100% of the piping was accessible for survey. The accessible pipe was sucyeyed by static measurement at one foot increments, for a total of 3 w e y mmurements.
2.3 The #al surface rues for the piping system is approximately 1,824 ma (0.2 m2) for the entire length of (3 ') of piping.
3.0 Survey U n3t Meamremefit Locations/Data 3.1 Pipe interior radiologid survey forms are provided in Attachment 2 of this release record.
4.0 Sumey Unit hvestigations/Resultsedts 4.1
'None 5.0 Data Assessment Results
- 5. I Data mscssment results are providd in the EPIsuried Pipe (BP) Survey Report provided in Attachment 1.
5.2 All measurernmt r e d s are less than the Derived Concentdon Guiddine Level (DCGL) for radionuclide specific EP that caresponds to the I mremlyr dose goal established in Table 3-3 of the FSSP.
5.3 When implementing the Unity Ilule, provided in Section 3 5.3 of the FSSP, and applying the Nuclide Fraction (NF), provided in TBD-06-004, the w v q unit that is constituted by EF CRT-10 passes FSS.
5.4 Background was not subtracted h m the survey measurements and the Elevated Measurement Comparison (EMC) was not empIayed for this survey unit.
Revision # Original Page2of3
5.5 Statistical Summ~lry Table Dommenbtion of evaluations pertabq to cornplimce with the umsbicted use limit of 25 mremlyr and dose contributions from Embedded Pipe and radionuclides contributing 100/6 in agyegak of the tdal dose for both skruchd scemrios and sods.
6 1 A review of the survey results has shown that the dose contribution for EP CRT-10 to be less than 1 memlyx. The dose cofibution is estimated to be 0.034 M y
r b a d on the average of the achd gross wunts measured.
Attachments A i k h m t 1 - BSI EPBP Survey Report - Pipe Interior Radiological Sutvey Form - DQA Worksheet -Disc containing RR for EP CRT-10 & Spreadsheet I
- /
Revision # Original Page 3 of3 Survey Unit: CRT-1 0
SECTION 7 ATTACHMENT 1 2
PAGE(S)
BSI EPlBP SURVEY REPORT 1 M01 LVSll no sled A
C M
VALUES NOT BACKGROUND CORRECTED RP E-f Date
SECTION 7 ATTACHMENT 2 r
PAGE(S)
BSVLVSPipeCmwler -002 Revision 5 Pipe Interior Radiological Survey Form Date:
\\ 0 -3.l -07 Time:
\\ ' 1 u o Pipe ID#:
(1 Pipe Diameter:
2, 5 "
Access Point Area: 5 L Building:
C /d Elevation :
- 3 Y '
System:
Type of Survey Investigation Characterization FkAk FinalSuwey Other Gross Co60 Cs Detector ID# / Sled D-ff \\ m h \\ \\LU<-\\
/
i\\!o
$,A Detector Cal Date:
\\ -\\ \\ 4 7 '
?
Detector Cal Due Date:
1 - \\ \\ - 0 6 Instrument:
>?So-\\
Instrument ID #:
~ Y Y DV\\
InstnunentCalDate:
\\ -1) 47 Instrument Cal Due Date:
1
- 0 8 From the Daily Pipe Survey Detector Control Form for the Selected Detector MDCRStatiC 1 i) cpm Eficiency Factor for Pipe Diameter 0. D 0 0 33
(&om detedor efficiency determination) m c s w t i c 392fl.
d p ~ d \\OD c1n2 Is the MDCshb acceptable?
No (isno, adjust sample count time and recalculate MD-1 C~mmeIlb:
D L 5 h o f i,
'od%
Crrr3(,,b Technician Signature r Pipe Interior Radiological Survey Package Page 1 of -
- Attachment 3, Page 1
REFERENCE COP K i
SECTION 7 ATTACHMENT 3 1
PAGE(S)
DQA Check Sheet Design #
EP CRT-I0 Revision #
Original Survey Unit #
EP-CRT-10 Preliminary Data R e v W Arwrwen to the fdlowlng questions should be tuly documented In the Survey Unit yeS No N,A Relea# Record
- 1.
Have surveys been performed in accordance with s u r q instructions in the Survey Design?
X
- 2.
Is the instrummtdion MDC for structure static measurements b l o w the DCGh for Class 1 and 2 survey units, or belaw 0.5 DCGh for Class 3 survey units?
X
- 3.
Is the instrumentation MDC for mbeddedlburied piping static measurements below the DCGh ?
X
- 4.
Was the inskrumentation MDC for structure scan measuments, soil scan measurements, and embedddhuried piping scan measurements below the DCGLw, or, if not, was the need for addiinal X
static measurements or soil samples addressed in the survey design?
- 5. Was the Instrumentation MDC forvolumdric measurements and smear enatyas c 10% DCGLw 7 X
- 6. Were the MDCs and assumptions used to develop them appropriate for the Instruments and techniques used to pertorm the survey?
- 7.
Were the survey methods used to collect data proper for the types of radialion involved and fwthe media being s u m y d 3 X
- 8.
Were "Special Methods' for data collection psoperly applled for the survey unlt under reviw?
X
- 9.
lo the data set: comprised of quallfled measurement results collected In aceordance wlth the survey design, which accurately reflects the radiological status of the faclllty?
x G r a p h i Data Review
- 1.
Has a posting plot been created?
- 2.
Has a hktog ram (or obhff frequency p!ot) been created?
- 3.
Have other graphical data tools been created to assist in analyzing the derta?
Data Analysis
- 3.
If elevated areas have been identified by scans andlor sampling, is the average activity in each elevated area < DCGLEMC (Qass 1 ), e DCGLW (Class 21, w 4.5 DCGLw (Class 3)?
X
- 4.
Is the result of the Elevated Measurements Test < 1.07 X
- 5.
is ths result of the statisthi test (S* for Sign Test w Wr for WRS Test) 2 the critlcal value?
X Page 1 of 1
SECTION 7 ATTACHMENT 4 1 DISC