ML073170344

Survey Unit Release Record EP 1.12B

ML073170344
Person / Time
Site:	Plum Brook
Issue date:	11/06/2007
From:	US National Aeronautics & Space Admin (NASA)
To:	NRC/RGN-III/DNMS/DB
References
EP 1.12B
Download: ML073170344 (13)

Text

Survey Unit Release Record Design # EP-1.12B Revision # Original Page 1 of 3 Survey Unit #(s) 1.12B

1) Embedded Pipe (EP) Survey Unit 1.12B meets the definition of embedded pipe for Plum Brook Reactor Facility (PBRF).

2) EP 1.12B is a Class 1, Group 1 survey unit as per the PBRF Final Status Survey Plan (FSSP) and Technical Basis Document (TBD)-06-004.

3) Surveys in EP 1.123 were performed using a scintillation detector optimized to measure gamma energies representative of Co-60. Sample #EP3-1 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 (BSI)/LVS-002, Work Execution Package (WEP)05-006. Survey instnrctions 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 BSYLVS-002, WEP 05-006, these determinations are appropriate for the types of radiation involved and the media being surveyed.

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I FSS Design # EP 1.128-Revision # Original Page 2 of 3 I Survey Unit: 1.128 I 1.0 History/Description 1.1 The subject pipe system is the 4" pipe system with 3" couplings, the system was accessed from the ring header in Quad A.

1.2 EP 1.12B consists of 4" diameter piping that is approximately 19 feet in length.

2.0 Survey Design Information 2.1 EP 1.12B was surveyed IAW Procedure #BSI/LVS-002.

2.2 100% of the 4" ID pipe was accessible for survey. The accessible 4" ID pipe was surveyed by static measurement at one foot increments, for a total of 19 survey measurements.

2.3 Surface area for the 4" ID piping is 973 cm2for each foot of piping, corresponding to a total 4" ID piping surface area of 18,487 em"(l.8 m2) for the entire length of (approximately 19') of 4" piping. Since the system also contained 3" diameter coupling sections, this estimate is believed to slightly overstate the actual surface area.

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

4.0 Survey Unit InvestigationsiResults 4.1 None 5.0 Data Assessment Results 5.1 Data assessment results are provided in the EPBuried 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 mremlyr 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 0, provided in TBD-06-004, the survey unit that is constituted by EP 1.12B 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.

5.5 This Survey Unit consists of multi-sized piping (MSP) as described in section 1.1 above. The detector used for this survey had efficiency determinations performed for each pipe size in the survey unit. The activity values reported in this survey unit release record were based on 3" pipe efficiency determinations. The 3" efficiency determination yields more activity per 100 cm2of piping, consequently it is the more

[ FSS Design # EP 1 . 1 2 ~ - ] Revision # Original

- Page 3 of 3 1 Survey Unit: 1.12B I conservative value. For example, 25 counts for the 3" efficiency yields 26,356 dpmI100 cm2, whereas 25 counts for the 4" diameter piping yields 19,767 dpmll00 cm2.

5.6 Statistical Summary Table Statistical Parameter 6.0 Documentation of evaluations pertaining to compliance with the unrestricted use limit of 25 mrem/yr and dose contributions from Embedded Pipe and radionuclides con&buting 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 1.I 2B to be less than 1mremlyr. The dose contribution is estimated to be 0.15 1 mrem/yr based on the average of the actual gross counts measured.

7.0 Attachments Attachment 1 - BSI EP/BP Survey Report Attachment 2 - Pipe Interior Radiological Survey Form Attachment 3 - DQA Worksheet Attachment 4 -Disc containing RR for EP 1.12B & Spreadsheet

SECTION 7 ATTACHMENT 1 z PAGE(S)

BSI EPlBP SURVEY REPORT A C T M N VAL RP Engineer I Date

EP 1.12B 3", 4" Pipe TBD 06-004 Group 1 1 MEDIAN sm DEV 0.101 0.197 MAX 0.943 MIN 0.050

SECTION 7 ATTACHMENT 2 3 PAGE(S)

BSWSPipeCrawler-002 Revision 4 Pipe Interior Radiological Survey Form Date: /0/(z/06 Time: / 0 5 1 Pipe ID#: 1, / 2 6 Pipe Diameter: lyZ 5 P Access Point Area: &

Building: cv Elevation: - I z" System: PII~(-, #F&F<

Type of Survey Investigation Characterization Final Survey Other Gross C06O J Cs Detector ID# / Sled ID# 44- /.Yq 2383671 101 Detector Cal Date: 6/zr /06 Detector Cal Due Date:

Instrument: 23r73-/ Instrument ID #: 2 ~ 3f Hf Instrument Cal Date: ~!c!o 6 Instrument Cal Due Date: 7/&7 From the Daily Pipe Survey Detector Control Form for the Selected Detector Background Value 1,3 cpm MDCKtatic 6,9 cpm D .0061-3 MDCsta~ic / 0'41 b IS the MDC*titi, acceptable?

Comments: a ~ rJV l (1-a k:v EfficiencyFactor for Pipe Diameter ofll &P3 -1 cmZ (from detector efficiency determination)

(ifno, adjust sample count time and recalculate M D C k )

Technician Signature

/

Pipe Interior Radiological Survey Package Page 1 of -3 Attachment 3, Page 1

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

Date: lo/[ z /O 6 Pipe ID#: 1,lzD Pipe Diameter: S7 Access Point Area: /4 Building: CV Elevation: -1 2 1 System: PI& bRR Package Page 2.of 3 REFERENCE COPY Attachment 3, Page 2

SECTION 7 ATTACHMENT 3 I PAGE(S)

DQA Check Sheet Design # EP 1128 Revision # Original Survey Unit # EP 112B Preliminary Data Review' Answers to the following questions should be fully documented in the Survey Unit Yes No NIA Release Record

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 D C G h for Class 1 and 2 X

survey units, or below 0.5 DCGLw for 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 survey?

7. Were the survey methods used to collect data proper for the types of radiation involved and for the X

media being surveyed?

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 CS-0912 Page 1 of 1

SECTION 7 ATTACHMENT 4 1 DISC