ML073170440

Survey Unit Release Record EP WHB-111-4

ML073170440
Person / Time
Site:	Plum Brook
Issue date:	11/07/2007
From:	US National Aeronautics & Space Admin (NASA)
To:	NRC/RGN-III/DNMS/DB
References
EP WHB-111-4
Download: ML073170440 (14)

Text

Survey Unit Release Record Design # EP-WHB-111-4 Revision # Original Page 1 of 3 Survey Unit #(s) WHB-111-4

1) Embedded Pipe (EP) Survey Unit WHB- 111-4 meets the definition of embedded pipe for Plum Brook Reactor Facility (PBRF).

2) EP WHB-111-4 is a Class 1, Group 3.3 survey unit as per the PBRF Final Status Survey Plan @SSP) and Technical Basis Document (TBD)-06-004.

3) Surveys in EP WHB- 111-4 were performed using a scintillation detector optimized to measure gamma energies representative of Cs-137. Sample #EP 3-3 fkom Survey Request (SR)-13 was referenced for this decision.

4) Survey Instructions for this survey unit are incorporated into and performed in accordance with (IAW) the Babcock Services Incorporated (l3SI)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) Instrument efficiency determinations are developed in accordance with the BSmVS-002, WEP 05-006, these determinations are appropriate for the types of radiation involved and the media being surveyed.

FSS Design # EP WHB- 111-4 Revision # Original Page 2 of 3 Survey Unit: WHB-111-4 1.0 HistoryDescription 1.1 The subject pipe system is an evaporator pit drain line located on the Waste Handling Building O;VHB) -5' el.

1.2 EP WHB-111-4 consists of 2" diameter piping that is approximately 30 feet in length.

2.0 Survey Design Information 2.1 EP WHB- 111-4 was surveyed IAW Procedure #BSI/LVS-002.

2.2 100% of the 2" ID pipe was accessible for survey. The accessible 2" ID pipe was surveyed by static measurement at one foot increments, for a total of 30 survey measurements.

2.3 Surface area for the 2" ID piping is 486 cm2for each foot of piping, corresponding to a total 2 ID piping surface area of 14,593 cm2(1.5 m2) for the entire length of (approximately 30') of 2" piping.

Survey Unit Measurement LocationsData 3.1 Pipe interior radiological survey forms are provided in Attachment 2 of this release record.

Survey Unit Investigations/Results 4.1 None 5.0 Data Assessment Results 5.1 Data assessment results are provided in the EP/Buried Pipe (BP) Survey Report provided in Attachment 1.

5.2 All measurement results are less than the Derived Concentration Guideline Level (DCGL) for radionuclide specific EP that corresponds to the 1 mrem/yr 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 FSSP, and applying the Nuclide Fraction (NF), provided in TBD-06-004, the survey unit that is constituted by EP WHB-111-4 passes FSS.

5.4 Background was not subtracted from the survey measurements and the Elevated Measurement Comparison (EMC) was not employed for this survey unit.

d FSS Design # EP WHB-111-4 Revision # Original Page 3 of 3 Survey Unit: WHB-111-4 5.5 Statistical Summary Table Maximum 0.0353 Minimum 0.0112 6.0 Documentation of evaluations pertaining to compliance with the unrestricted use limit of 25 mdyr and dose contributions fiom Embedded Pipe and radionuclides contributing 10% in aggregate of the total dose for both structural scenarios and soils.

6.1 A review of the survey results has shown that the dose contribution for EP WHB-111-4 to be less than 1 mrem/yr. The dose contribution is estimated to be 0.018 mredyr based on the average of the actual gross counts measured.

7.0 Attachments Attachment 1 - BSI EPBP Survey Report Attachment 2 - Pipe Interior Radiological Survey Form Attachment 3 - DQA Worksheet Attachment 4 -Disc containing RR for EP WHB- 1 1 1-4 & Spreadsheet

SECTION 7 ATTACHMENT 1 3 , PAGE(S)

BSI EPIBP SURVEY REPORT COMMENTS:

ACTIVITY VALUES NOT BACKGROUND CORRECTED RP Engineer 1 Date

/o-30-07

EP WHB-111-4 2" Pipe TBD 06-004 Group 3.3

EP WHB-111-4 2" Pipe TBD 061004 Group 3.3 s

Cs-137 actlvity Cs-137 PeHvity Co-BO acfivity Eu-152 activity Eu-164 activity Nb-84 activity Ag-108m activity unity MEAN 0.018 MEDIAN 0.018 STD DEV 0.005 MAX 0.035 MIN 0.011

SECTION 7 ATTACHMENT 2 3 PAGE(S)

BSYLVSPipeCrawler-002 Revision 4 Pipe Interior Radiological Survey Form Date: B/~8/0~ Time: 0 V9.6 Pipe ID#: - -

( , u ~ B / 1( 9- Pipe Diameter: 2 Access Point Area: EVHP r Building: W H 13 Elevation: -5' System: ~3iz41IW Type of Survey Investigation Characterization Final Survey A Other /

Gross C06O Cs /

Detector ID# 1 Sled ID# #-/ fl 23F3G 7 I NO SLFD Detector Cal Date: 6/z1/06 Detector Cal Due Date: 6/z//O 7 Instrument: 2 3 m-/ Instrument ID #: ' /$??09+

Instrument Cal Date: s / /r/06 Instrument Cal Due Date: 3/[se/o 7 From the Daily Pipe Survey Detector Control Form for the'selected Detector Background Value 35. cpm MDCKtatic 23.4- CPm Efficiency Factor for Pipe Diameter 38 (from detector efficiency determination) a:'

0. 0 MDCstatic 6 6 14 cm2 Is the MDCskti, acceptable? (if no, adjust sample count time and recalculate MDCKmtic)

Comments: ~ W W E ~ EP3- . 3 CO~~?LF/TI=-

A Technician Signature Pipe Interior Radiological Survey 5

Package Page 1 of -

REFERENCECOPY Attachment 3, Page 1

BSIlLVSPipeCrawler-002 Revision 4 Pipe Interior Radiological Survey Form (Continuation Form)

Date: 312 %/06 Building:

Pipe,lD#: wt+a I 4 I r. 4 r"f B Pipe Diameter:

Elevation:

.zl Access Point Area:

System:

FL/&p ?I r Package Page o f 5 REFERENCECOPY Attachment 3, Page 2

SECTION 7 ATTACHMENT 3 I PAGE(S)

DQA Check Sheet Design # WHB-111-4 Revision # Original Survey Unit # WHB-111-4 Preliminary Data Review' Answers to the following questions should be fully documented in the Survey Unit Release Record Yes No NA

1. Have surveys been performed in accordance with survey instructions in the Survey Design? X

2. Is the instrumentation MDC for structure static measurements below the DCGLw for Class 1 and 2 X

survey units, or below 0.5 DCGLWfor Class 3 survey units?

3. Is the instrumentation MDC for embeddedlburied piping static measurements below the DCGLw ? X

4. Was the instrumentation MDC for structure scan measurements, soil scan measurements, and embeddedlburied piping scan measurements below the DCGLw, or, if not, was the need for additional X static measurements or soil samples addressed in the survey design?

5. Was the instrumentation MDC for volumetric measurements and smear analysis < 10% DCGLw ? X

6. Were the MDCs and assumptions used to develop them appropriate for the instruments and techniques used to perform the survey3

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 Methods" for data collection properly applied for the survey unit under review X

9. Is the data set comprised of qualified measurement results collected in accordance with the survey X

design, which accurately reflects the radiological status of the facility?

Graphical Data Review

1. Has a posting plot been created? X

2. Has a histogram (or other frequency plot) been created? X

3. Have other graphical data tools been created to assist in analyzing the data? X Data Analysis

1. Are all sample measurements below the DCGLw (Class 1 & 2), or 0.5 DCGLW(Class 3)? X

2. Is the mean of the sample data < DCGLw? X

3. If elevated areas have been identified by scans and/or sampling, is the average activrty in each X elevated area < D C G h c (Class I), c DCGLw (Class 2), or c0.5 DCGLw (Class 3)?

4. Is the result of the Elevated MeasurementsTest < 1.0? X

5. Is the result of the statistical test (S+ for Sign Test or Wr for WRS Test) 2 the critical value? X Comments:

CS-0912 Page 1 of 1

SECTION 7 ATTACHMENT 4 1 DISC