ML073330641
| ML073330641 | |
| 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-5 | |
| Download: ML073330641 (12) | |
Text
Description Survey Unit Release Remd Mgn # Survey Unit in accordance with (IAW) the Bkk Services Tncorporated (I3SI)LVS-002, Work Execution Package (WEP)05-006. Survey instructions described in this document constitute "Spgcial Methods" and the survey design used in the acquisition of survey measurements.
- 5) Instrument flciency determinations are dewIoped in 8ccordao.a with, the BSXVS-002, WEP 05-006, these determinations are approptiate for the types of radiation involved and the media being surveyed.
EP-CRT-5 CRT-5 1) Embedded Pipe (EP) Survey Unit CRT-5 meets the definition of embedded pipe fbr Plum Bmk Re&m Facility (PBRF). 2) EP CRT-5 is a Chss 1, Group 1 survey unit as per the PBRF Final Status Survey Plan (FSSP) and Technical Basis Damment (TBDh06-004.
- 3) Surveys in EP CRT-5 were performed using a scintillation detector optimized to measure gamma energies representative of Co-60. Sample #EP 3- 9 from Survey Request (SR)- 1 3 was referenced for this decision.
- 4) Survey Instructions fwr this survey unit are incorporated into and performed Revtion # Original Page I of 3
- FSS Design # EP CRT-S Revision # Original Page 2 of 3 Survey Unit: CRT-5 1.0 History~ption 1.1 The subject pipe system is a 2.5" dimeta pdon located on the CRT plate within the Sub Pile Raom. The system ams point is located on the -34' el, of the k building.
1.2 EP CRT-5 consists of 2.5" diameter piping that is approxhiely 3 feet in length. 2.0 Swey Design Momtion 2.1 EP CRT-5 was sumeyed IAW Procedure
- BSLILVS-002.
2.2 10P? of the piping was accessible Tor survey. The accessible pipe was surveyed by static measurement at one foot increments, for a total of3 survey mmumrnerrts.
2.3 The total sudb area for the piping system is approximately 1,824 cm2 (0.2 m2) for the entire length of (3') of piping. Survey Unit Measurement hcationdData 3.1 Pip interior radiological survey forms are provided in AtWment 2 of this release record. Survey Unit Eflv~o~suIts 4.1 None Data Assessment Results 5.1 Data assessment resuks ate pravided in the EPIsuded Pipe @P) Survey wort provided in Attachment
- 1. 5.2 MI measurement results are less than the Derived Co-ation Guiddine Level (DCGL) for radionucIide specific EP that mmponds to the I medyr 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 app1ying the Nuclide Fraction 0, provided in TBD-06-004, the swey unit that is constituted by EP CRT-5 passes FSS. 5,4 Background was not subtracted from the survey measurements and the Elevated Meamanent Comparison
@MC) was not employed fbr this suwq unit.
Page 3 of 3 Survey Unit: CRT-5 5.5 Statistiad Summsry Table Domm&tion ofwaluations pertaining to compliance with the unrestrcted use hit of25 Wyr and dose oonttibutions from Embedded Pipe and radionuclidea contfibuting 1% in aggregate of the total dose fbr both stmdvd scenarios and soils. 6.1 A review of the survey re& has shown that & dose wntributia4 far EP CRT-5 to be less than 1 mrem/yr. The dose &bution is estimated to be 0.032 dyr based on the average of the actual gross counts meam& Affmrchnments Attachment 1 - BSI EPBP Survey Report A#achent 2 -Pipa Mor Wological Survey Form Attachment3-DQAW~k&&
Attachat 4 -Disc containing RR for EP CRT-5 & Spreadsheet Total Number of Survey Measummenfs Number of Measurements
>MDC Number of Measurnmenis Above SQ% of DCGL Numbep of Measurements Above DCGt Mean Median Standard Deviation 3 1 0 0 0.0317 0.0059 ~.@m Maximum Minimum 0.0832 0.0058 SECTION 7 ATTACHMENT 1 2 PAGE(S)
ACTMfY VALUES NOT BACKGROUND CORRECTED RPwlorde EP CRT-5 2.5" Pipe T BD OW04 Group 1 I I El oprlmy Cs.W adMy h.162 arwi?y Eu-lM.ralty NM1- i Ag-tMm.ranh 1 2 2 8,081 997 40 946 251 29 7 0.006 2 2 2, 8,061 997 40 948 251 29 7 0.006- 3 28 28 84,848 13,W 553 13,237 j 3,519 407 97 0.083- I - i MEAN 0.092 MEDIAN i 0.OM SfD DEV 0.045 MAX 0.093 MIN 0.008 SECTION 7 ATTACHMENT 2 z PAGE@)
-- - B SKVSPipeCrawler-002 Revision 5 Pipe Interior Radiological Suwey Form nate: ~~-~~-~T Time: ~ipeID#: LRT- 5 PipeDiameter:
'1.5 Access Pointha: %L P\\e R'P1 Lk-' , -3v Building:
Elevation:
System: Type of Survey Investigation Characterization , Find Survey _2(_ Other ,I Gross Co60 d - Cs Detector Cal Date: 1 - \ \- 07 Detector Cal Due Date: \*\\--bR hstrument:
1350 - \ Instrument ID #: 199 074 Instrument cal Date: I - \ \ - 07 hstrument~al~ue~ate: - \ - -66 prom the Daily Pipe Survey Detector Control Form for the SeIected Detector ~ackground Value . cpm MDCR*tatic
\ n cpm Efficiency FactorforPipeDiameter Or00033 (from detector efficiency determination)
,3429 d~d IDTO cm 2 Is the MDCa6, acceptable?
No (if no, adjust sample count time and recalculate MI)CL) Technician Signature Pipe Interior Radiological Survey Package Page 1 of 7 Attachment 3, Page 1 REFERENCE CQPY 0 SECTION 7 ATTACHMENT 3 r PAGE(S)
DBA Check Sheet Design # EP CRT-5 Revision # Origtnal survey Unit # EP-CRT-5 Preliminary D& ReW Answers to the followim~
questions ehould be fully documented in the Sunrey Unit Yes No NIA Release Record 1. Haw sunreys been performed in accordance with sunrey ihdions in the Survey Design? X 2. Is the instrumentation MDC for stnrcture staic masurments below the DCGh for Cla~ 1 and 2 survesy units, or below 0.5 DCGh for Class 3 survey unk? X 3. Is the instrumentation MDC for embeddgdlburied piping Wc measurements below the DCQL ? X 4. Was the instrumentation MDC for sb-uchrre scan masurments, sol1 scan measurments, and smbeddedlburied piping mn measurements below the DCQLw, or, if not wss the need for additional X statlc measurements or soil samptes addressed in the survey design? 5. Was the instrumentathn MDC forwtwne4ric measurements and smear analysis < 10% DCGk ? X 6. Were the MDCs and ammptions used to develop them appropriate for the instruments and techniques used to perfwm the rum --- 7. Were the survey methods used to collect data proper for the types of radiation Involved and for the media being surveyed?
X 8. Were'Special Methodsn for data collection property applied for the survey unit under revlM X O. Is the data set comprisd of qualifled measurement results collected in accordance wRh the survey design, which accurately reflects the radiological status of the facili X Graphical Data Review I. Her a posting plot been created? X 2. HIS r histogram (or other frequency pld) been mated? X SECTION 7 ATTACHMENT 4 1 DISC