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

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-21 is et Class I, Gmup 1 survey unit as per the PBRF Final Status S m y Plan (FSSP) atld Technical Basis Document (TBD)46-004.

3) Surveys in EF IT-1 1 were performed using a d l a t i o n 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 ~coordaxlcewith (IAW) the Babmck Services Incorporated @SI)/LVS-002, Work Execution Package (WEP)05-006. Survey instructions described in this Description 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#EPIT-11 Survey Unit: IT-1 1 Revision # Original 1 Page 2 of 3 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. ofthe Rx building.

1.2 EP IT-11 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 #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 t o t . of 3 SUNey mMStNWllf:~S.

2.3 ThetotalSUffaoe~forthepipingsystemisappro~ately2,919m2 (0.3m2)for the entire length of (3') of piping.

S m y Unit hkitsmm& W o n s D a t a 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 m m e n t results are provided in the WIBmied Pipe (BPI Survey R e p d 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 d y r 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-11 passes FSS. I 5.4 Background was not mhackd from the survey measurements a d the Elevated Mmumnent Comparison (EMC)was not employed for this survey unit.

FSS Design # EP IT-1I Revision # Original I' Page3 of3 S w e y Unit: IT-11 5,s Statistical Summary Table Number of Measumments > M E 1 Numbr of Measurnmen& Above 50% of DCGt 0

~ u m b eofi MeesumrnentsA ~ V DCGL B o Mean O.Of 99 Mdan 0.0085 Standad M a t t o n 0.0227 Maxhnum 0.0460 Minimum 0.0051 J 6.0 Documentation of evaluations pertaining to compliance with the mmaicted use limit of25 m m d y r and dose &butions b m Embedded Pipe and radionuclides contributing lo??in aggregate of the W dose fbr both st.ructutaI sceuarios and soils, 6.1 A h e w of the s w e y results has shown that the dose contrihtion fur EP IT-11 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~calSurvey Form Attachment 3 - DQA Worksheet Attachent 4 -Disc containing KR fbr BP IT-1 1 & S p m d s k t

SECTION 7 ATTACHMENT 1 2 PAGE(S)

BSI EPBP SURVEY REPORT

1. 1MGI L V S l l I01 ACTMPl VALUES NOT BACKGROUND CORRECTED

SECTION 7 ATTACHMENT 2

B SULVSPipeCraw Ier-002 Revision 5 Pipe Interior Radiological Survey Fo r n ~

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

~ e t e c t 6 rID#I sled ID# \ ~ ~ L V - - V/ -L \ A * \o\

Detector Cal Date: \ - \ \ 7 Detector Cal Due Date: -\\-08 Instrument: I Y ' 5 0 -\ Instrument ID #: \ P 409'-\

Instrument Cal Date: \-\)*b> Instrunlent Cal Due Date: \ - \\Hog Fro111the 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? d-p1d 1r j ~ cm2 Is the MDCsblicacceptable? @& NO {if no, adjust sample count time and recalculate MDC$tptic)

Comments: B o d c3 0 \ DO?,

Tecbician Signature Pipe Interior Radiological Survey Attachment 3, Page 1

SECTION 7 ATTACHMENT 3 I PAGE(S)

DQA Check Sheet Design # EP IT-11 Revlsion # Original Survey Unit # EP-IT-11 Prellmlnary Data Review' Answe~ to the following questions should be fully documented In the Survey Unit Release Record yeS No N,A

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 Iand 2 X survey units, or below 0.5 DCGLw for Class 3 survey units?

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. ifnot, 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 *SpecialMethods"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 x

design, which accurately reflectsthe radiologid status of the facility?

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