ML073330476

EP-CRT-10, Nasa, Survey Unit Release Record

ML073330476
Person / Time
Site:	Plum Brook
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 Swey Request (SR)- 13 was referenced for this decision.

EP-CRT- 10 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.

Mion # 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 wey 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 red 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 wvq unit that is constituted by EF CRT-10 passes FSS. 5.4 Background was not subtracted hm 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 Myr bad on the average of the achd gross wunts measured.

Attachments Aikhmt 1 - BSI EPBP Survey Report Attachment 2 - Pipe Interior Radiological Sutvey Form Attachment 3 - DQA Worksheet Attachment 4 -Disc containing RR for EP CRT- 10 & Spreadsheet I FSS Design # EP CRT- 1 0 -/ 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 ACM 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: \'1uo Pipe ID#: (1 Pipe Diameter:

2, 5 " - Access Point Area: 5 L Building:

C /d Elevation

- 3Y' System: Type of Survey Investigation Characterization FkAk FinalSuwey Other Gross Co60 ,- Cs Detector ID# / Sled D-ff \mh\ \LU<-\ / i\!o $,A Detector Cal Date: \ -\ \ 4 7 ' ? Detector Cal Due Date: 1 -\\-06 Instrument:

>?So-\ Instrument ID #: ~YY DV\ InstnunentCalDate:

\ -1) 47 Instrument Cal Due Date: 1- -08 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) mcswtic 392fl . dp~d \OD c1n2 Is the MDCshb acceptable?

@ No (isno, adjust sample count time and recalculate MD-1 C~mmeIlb:

DL 5 hofi, 'od% Crrr3(,,b Technician Signature r Pipe Interior Radiological Survey Package Page 1 of - - Attachment 3, Page 1 REFERENCE COP Ki SECTION 7 ATTACHMENT 3 1 PAGE(S)

DQA Check Sheet Design # EP CRT-I0 Revision # Original Survey Unit # EP-CRT-10 Preliminary Data RevW 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 surq instructions in the Survey Design? X 2. Is the instrummtdion MDC for structure static measurements blow 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 sumyd3 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 Graphi 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