ML073330464

EP-IT-11, Nasa, Survey Unit Release Record

ML073330464
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-IT-11
Download: ML073330464 (12)

Text

Description A Survey Unit Release Record - EP-IT- 1 1 Revision # Original Page 1 of 3 rr-11

• 1) Embedded Pipe (EP) Survey Unit IT-1 I meets the definition of embedded pipe fix Plum Brook R&or Facility (PERF). 2) EP IT-2 1 is et Class I, Gmup 1 survey unit as per the PBRF Final Status Smy Plan (FSSP) atld Technical Basis Document (TBD)46-004.

3) Surveys in EF IT-1 1 were performed using a dlation detector optimized to measure gamma energies representative of Co-60. Sample #EP 3-9 from Survey Request (St)-1 3 was refaend fbr this decision.

4) Survey Instructions for this survey unit are incorporated into and performed in ~coordaxlce with (IAW) the Babmck Services Incorporated

@SI)/LVS-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) Instmmrt efficiency determinations are developed in accordance with the BSVLVS-002, WEP 05-006, these determinations are appropriate for the types of radiation involved and the media being surveyed.

FSS/Chamct&ation Engineer FSS De~gn #EP IT-11 Revision # Original 1 Page 2 of 3 - Survey Unit: IT-1 1 1.0 HistorylDescriptioa 1 . I The subject pipe system is a 4" diameter penetration located adjacent to the CRT plate within the Sub Pile Room. The system access point is 1- on the -34' el. of the Rx building.

1.2 EP IT-1 1 consists of 4" diameter piping that is approximately 3 feet in length. Survey Design Information 2.1 EP IT-1 1 was surveyed TAW Procedure

1. BSflLVS-002.

2.2 2 00% of the piping wati accessible for survey. The accessible pipe was surveyed by &c measurement at one foot increments, for a tot. of 3 SUNey mMStNWllf:~S.

2.3 ThetotalSUffaoe~forthepipingsystemisappro~ately2,919m2 (0.3 m2) for the entire length of (3') of piping. Smy Unit hkitsmm& WonsData 3.1 Pipe interior mdiological survey bms are provided in Attachment 2 of this relettse record, 4.0 Survey Unit Investigatio&dts 4.1 None 5.0 Data Assessment Results 5.1 Data mment results are provided in the WIBmied Pipe (BPI Survey Repd provided in Attachment

1. 5.2 All measurement results are less than the Derived Concentration Guideline Level @CGL) for radionuclide specific EP that cmesponds to the 1 dyr dose goal established in Table 3-3 of the FSSP, 5 -3 When implementing the Unity Rule, provided in Section 3.6.3 of the FSSF, and applying the Nuclide Fraction 0, provided in TBDWW4, the survey unit that is constituted by EP IT-1 1 passes FSS. I 5.4 Background was not mhackd from the survey measurements ad the Elevated Mmumnent Comparison (EMC) was not employed for this survey unit.

5,s Statistical Summary Table FSS Design # EP IT- 1 I Revision # Original I' Page3 of3 6.0 Documentation of evaluations pertaining to compliance with the mmaicted use limit of25 mmdyr and dose &butions bm Embedded Pipe and radionuclides contributing lo?? in aggregate of the W dose fbr both st.ructutaI sceuarios and soils, 6.1 A hew of the swey results has shown that the dose contrihtion fur EP IT-1 1 to be less than I meadyr, The dose amhbution is estimated to be 0.020 mmlyr based on the average of the actual gross counts measured.

Attadmmts Attachment 1 - BSI EPlsP Survey Repoxe Attachment 2 - Pipe Interior Radiolo~cal Survey Form Attachment 3 - DQA Worksheet Attachent 4 -Disc containing KR fbr BP IT-1 1 & Spmdskt Swey Unit: IT- 1 1 Number of Measumments

>ME Numbr of Measurnmen&

Above 50% of DCGt ~umbei of Meesumrnents A~VB DCGL Mean Mdan Standad Matton Maxhnum Minimum 1 0 o O.Of 99 0.0085 0.0227 0.0460 0.0051 J SECTION 7 ATTACHMENT 1 2 PAGE(S)

BSI EPBP SURVEY REPORT # 1 MGI LVSll I 01 ACTMPl VALUES NOT BACKGROUND CORRECTED

SECTION 7 ATTACHMENT 2

B SULVSPipeCraw Ier-002 Revision 5 Pipe Interior Radiological Survey Fo rn~ Date: ,~~-~~-~~

Time: \lo2 Pipe ID#: 7- T -\\ Pipe Diameter:

Building:

Elevation:

System : Type of Survey Investigation Characterization Final Survey Other *J Gross ~o6b d Cs ~etect6r ID# I sled ID# \~~LV--V-\

/ LA * \o\ Detector Cal Date: \ -\\ 7 Detector Cal Due Date: -\\-08 Instrument:

IY'50 -\ Instrument ID #: \P4 09'-\ Instrument Cal Date: \-\)*b> Instrunlent Cal Due Date: \ - \\Hog Fro111 the Daily Pipe Survey Detector Control. Form for the Sdected Detector Background Value 3 ,Y cpm MDC&hiiC \ 0 cpm Etfciency Factor for Pipe Diameter a (from detector efficiency determination) mc~taei~ 3&9? dpd 1 rj~ cm2 -1 Is the MDCsblic acceptable?

@& NO {if no, adjust sample count time and recalculate MDC$tptic)

Comments:

Bod c 30 \ DO?, Tecbician Signature Pipe Interior Radiological Survey Attachment 3, Page 1

SECTION 7 ATTACHMENT 3 I PAGE(S)

DQA Check Sheet Design # EP IT-1 1 Revlsion # Original Survey Unit # EP-IT-11 Prellmlnary Data Review' Answe~ to the following questions should be fully documented In the Survey Unit yeS No N,A Release Record 1. Have surveys been performed In 8ccordance with sunrey instructions in the Survey Design? X 2. Is the instrumentation MDC for structure ststic meesurements below the DCGLw for Class I and 2 survey units, or below 0.5 DCGLw for Class 3 survey units? X 3. Is the Instrumentation MWC for embeddadlburied piping static measurements balow the DCGLw ? X 4. Was the instrumentation MDC for slmcture scan measurements, soil smn measurements, and embeddmuried piping scan measurements below the DCGLW, or. if not, was the need for adtiiwral X static measurements or samples addressed in the sumy design? 5. Was the instrumentation MDC for volumetric measurements and smesr analysls < 10% DCGLw ? X 6. Were the MDCs and assumptions used to develop them appropriate for the instruments and techniques used to perform the survey? 7. Were the survey methods used to coled data proper for the types of radiation invdved and for the media being surveyed?

X 8. Were *Special Methods" for data dlectlon properly applied for the survey unit under reviw? X 9. Is the data set comprised of qualitled measurement results collected in accordance with the survey design, which accurately reflects the radiologid status of the facility?

x Gmphical Data Review 1. Haa a posting pIot been created? X 2. Has a histogram (w other frequency plot) been created? X Page 1 of 1 SECTION 7 ATTACHMENT 4 1 DISC