ML080670382
| ML080670382 | |
| Person / Time | |
|---|---|
| Site: | Plum Brook File:National Aeronautics and Space Administration icon.png |
| Issue date: | 03/04/2008 |
| From: | Case R US National Aeronautics & Space Admin (NASA), John H. Glenn Research Ctr at Lewis Field |
| To: | NRC/RGN-III |
| References | |
| EP-PPH 103 | |
| Download: ML080670382 (13) | |
Text
Survey Unit Release Record Design #
/
EP-PPH 103 /
Revision# I Original I Page I of 3 Survey Unit #(s)
I PPH 103 Description
- 1) Embedded Pipe (EP) Survey Unit PPH 103 meets the definition of embedded pipe for Plum Brook Reactor Facility (PBRF) for those portions of piping embedded in the building foundation walls of the himary Pump House
{PPH). The portion of piping which transits in soil under the buildings does not meet the criteria for embedded piping. The complete piping will be grouted, the portions embedded in the building structure will remain embedded for any future reuse, those portions in the ground can be released for unrestricted use.
- 2) EP PPH 103 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 PPH 103 were performed using a scintillation detector optimized to measure gamma energies representative of Co-60. Sample #EP 3-9 from Survey ~ e ~ u i s t (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 (WEEP)05-006. Survey instructions described in this 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 BSVLVS-002, WEP 05-006, these determinations are appropriate for the types of radiation involved and the media being surveyed.
Approval Signatures Date:
I I
FSSICharacterization Engineer FSSiCharacterization Manager Form CS-0911 Rev 0
FSS Design # EP PPH 103 Revision # Original Page 2 of 3 Survey Unit: PPH 103 1.0 History/Description 1.1 The subject pipe is an 8 emergency fill line in PPH Room.
1.2 EP PPH 103 consists of 8 diameter piping that is approximately 11 feet in length.
2.0 Survey Design Information 2.1 EP PPH 103 was surveyed IAW Procedure #BSI/LVS-002.
2.2 100% of the 8 pipe was accessible for survey. The accessible 8 pipe was surveyed by static measurement at one foot increments, for a total of 11 survey measurements.
2.3 Surface area for the 8 piping is 1946 cm2 for each foot of piping, corresponding to a total 8 piping surface area of 21406 cm2 (2.1 m2) for the entire length of (approximately 11) of 8 piping.
3.0 Survey Unit Measurement Locations/Data 3.1 Pipe interior radiological survey forms are provided in Attachment 2 of this release record.
4.0 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 This survey unit was assessed as a building re-use scenario with all activity derived dose as a 100% Co60 nuclide distribution. This is the most conservative DCGL for the facility (11,000dpm/100cm2).
5.3 When implementing the Unity Rule, provided in Section 3.6.3 of the FSSP, two survey measurements exceeded unity. The survey unit that is constituted by EP PPH 103 passes FSS after application of Elevated Measurement Comparisons (EMC) and Elevated Measurement Tests (EMT). The EMC Unity sum was 0.086 of unity, and the EMT Unity sum was 0.672 of unity.
5.4 DCGLs for the building reuse scenario are used to demonstrate compliance with the release criterion for this release record. The DCGLs for embedded pipe are not applied, therefore the Structural Area Factors listed in Table 3-5 of the FSS are the appropriate area factors for EMC and EMT evaluations.
5.5 The area factor of 20.8 was utilized for this survey unit, this is the appropriate area factor listed in Table 3-5 of the PBRF FSSP.
5.6 Background was not subtracted from the survey measurements.
FSS Design # EP PPH 103 Revision # Original Page 3 of 3 Survey Unit: PPH 103 5.7 Statistical Summary Table Statistical Parameter 8
Pipe Total Number of Survey Measurements 11 Number of Measurements >MDC 11 Number of Measurements Above 50% of DCGL 10 Number of Measurements Above DCGL 2
Mean 0.829 Median 0.671 Standard Deviation 0.494 Maximum 1.940 Minimum 0.431 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 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 PPH 103 to be less than 25 mrem/yr. The dose contribution is estimated to be 20.7 mrem/yr based on the average of the actual gross counts measured.
7.0 Attachments - BSI EP/BP Survey Report - Pipe Interior Radiological Survey Form - DQA Worksheet - EP PPH 103 SURR & Spreadsheet Disc
SECTION 7 ATTACHMENT 1 2 PAGES
PPH 103 8" Pipe TBD 06-004 Group 1 Measurement #
gcpm ncpm Co-60 activity (total dpm)
Co-60 activity (dpm/100cm2)
991 991 143,623 7,380 0.671 0.671 2
637 637 92,319 4,744 0.431 0.431 3
754 754 109,275 5,615 0.510 0.510 4
1017 1017 147,391 7,574 0.689 0.689 5
1286 1286 186,377 9,577 0.871 0.871 6
2865 2865 415,217 21,337 1.940 7
2414 2414 349,855 17,978 1.634 8
998 998 144,638 7,433 0.676 0.676 9
752 752 108,986 5,600 0.509 0.509 10 759 759 110,000 5,653 0.514 0.514 11 990 990 143,478 7,373 0.670 0.670 6,772 0.086 0.672 MEAN 0.829 EMC Unity EMT Unity MEDIAN 0.671 STD DEV 0.494 MAX 1.940 MIN 0.431 0.086 0.056 1 of 1
SECTION 7 ATTACHMENT 2 3 PAGES
SECTION 7 ATTACHMENT 3 1 PAGE
DQA Check Sheet Design #
EP PPH-103 Revision #
Original Survey Unit # 1 EP PPH-103 Preliminary Data Review' Answers to the following questions should be fully documented in the Survey Unit Release Record Yes No N/A
- 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 DCGLwfor Class 1 and 2 survey units, or below 0.5 DCGLw for Class 3 survey units?
X
- 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 analvsis c 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 media being surveyed?
X p~~
~
-~
8 Were Spectal Methods" for data co lection properly applied for the survey bri I under revlew?
9 1s tne aata set comprised of qualified measurement results collected in accoroance with the survey I...;
design, which accurately reflects the radiological status of the facility?
A 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 are% havebeen ioentified by scans andlor sampl ng.s tne average activily in each elevated area cDCGL~~uc!ass 1). c DCGLw ( C l a g ~ o r c0.5 DCGLW (Class 3)1 I. -
1 4.
Is the result of the Elevated Measurements Test < 1.O?
1 x 1 I
I
- 5. IS the result of the statistical test (S+for Sign Test or W, for WRS Test) > the critical value?
X Comments:
See Sedion 5 of this Survey Unit Release Record FSSl Characterization Manager (printlsign)
Page 1 of 1
SECTION 7 ATTACHMENT 4 1 DISC