ML081580596

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Final Status Survey Summary Report, March 24, 2008, Service Water Piping System Survey Unit F8990471
ML081580596
Person / Time
Site: Rancho Seco
Issue date: 04/28/2008
From: Ellen Brown
Sacramento Municipal Utility District (SMUD)
To:
NRC/FSME
References
F8990471
Download: ML081580596 (23)
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Text

Rancho Seco Final Status Survey Summary Report March 24, 2008 Service Water Piping System Survey Unit F8990471 Prepared By: 5/*.

  • ý/

Date: 0/2/12006 FSS En ineer Reviewed By:

Date:______06' Lead FSS Engineer Approved By:

Date:_________

Dismantlement Superintendent, Radiological

FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit:

F8990471, Service Water Piping System Survey Unit

Description:

Operating History: This system filtered and conditioned untreated raw water from the makeup system and transported water to various non-safety coolers and utility stations throughout the site. This system was designed to be clean. Operating records and the HSA document no occurrences of radioactive, contamination associated with this system piping.

Site Characterization: Direct measurements were made of the interior surfaces of the system piping which confirmed the absence of plant-derived radionuclides. Direct measurements of the interior showed a mean gross activity level of 187 dpm/100 cm 2 and a maximum value of 2,700 dpm/100 cm2. Based on the classification procedure (DSIP-0020) and levels of gross activity reported, the system was determined to be a Class 3 system.

HSA Events: None

,Survey Unit Design Information:

The Survey Unit Design Parameters are presented in Table 1 below. The survey unit and measurement locations are depicted on the maps in Attachment 1. Direct measurement locations wvere spaced at 15cm intervals and 5.1 m2 were scanned for approximately 2%

coverage. The instrumentation used for the survey along with the MDC values are listed in Tables 2-1 and 2-2 in Attachment 2.

Page 2 of 8 FSS Summary Report

. F8990471

Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area:

F899 Service Water Piping System Structure Surface LTP Table 5-4 Survey Unit:

Class:

SU Area (m2):

Evaluator:

DCGL (dpm/100 cm2):

Area Factor:

Design DCGLemc (dpm/100 cm 2):

LBGR (dpm/100 cm 2):

Design Sigma (dpm/100 cm 2):

Type I Error:

Type II Error:

Predominant Nuclide:

Sample Area (m2):

Scan Area (M2):

Scan Coverage (%):

Zi-, :

Zj_P :

Sign P:

Calculated Relative Shift:

Relative Shift Used:

N-Value:

Design N-Value + 20%:

Design Min Samples N:

Grid Spacing L:

0471 3

250.3 Erin L. Brown 100000 N/A N/A 50000 1992 0.05 0.05 Cs-137 N/A 5.1 2%

1.645 1.645 0.99865 25.1 3

11 14 14 N/A Gross Activity DCGL Class 3 Class 3 Default = 50% DCGL Class 3 Class 3 Uses 3.0 if Relative Shift is

>3 NUREG-1575 Table 5-5 Class 3 Class 3

, Page 3 of 8 FSS Summary Report F8990471

Survey Results:

A total of 71 direct measurements were made in F8990471. The results including mean, median, standard deviation and range are shown in Table 2. All direct measurements were less than the DCGL. None of the measurements indicated areas of elevated activity.

Scan activity ranged from 1036 to 1580 dpm/100 cm2, based on the pipe detector efficiency.

Table 2. Direct Measurement Results Measurement ID Gross Activity (dpmlO00 cm)

F8990471-MOOOIGI 1502 F8990471-MOO02GI 1499 F8990471-MOO03GI 1477 F8990471-MOO04GI 1388 F8990471-MOO05GI 1362 F8990471-MOO06GI 1391 F8990471 -M0007GI 1494 F8990471-MOO08GI 1431 F8990471-MOO09GI 1470 F8990471-MOOlOGI 1497 F8990471-MOO11GI 1525 F8990471-MOO12GI 1422 F8990471-MOO13GI 1452 F8990471-MOO14GI 1493 F8990471-MO005GI 1445 F8990471-MOO16GI 1523 F8990471-MOO17GI 1481 F8990471-MOO18GI 1492 F8990471-MOO19GI 1496 F8990471-MOO20GI 1571 F8990471-MOO21GI

1547, F8990471-M0022GI 1535 F8990471-M0023GI 1488 F8990471-M0024GI 1511 F8990471-M0025GI 1502 F8990471-M0026GI 1543 F8990471-M0027GI 1580 F8990471-M0028GI 1577 F8990471-M0029GI 1547 F8990471-MOO30GI 1515 F8990471-MOO31GI 1496 SF8990471 -M0032GI 1530 F8990471-M0033GI 1474 F8990471-M0034GI 1488 F8990471-M0035GI 1496 F8990471-M0036GI 1435 F8990471-M0037GI 1475 F8990471-M0038GI 1404 F8990471-M0039GI 1425 F8990471-MOO40GI 1453

'Page 4 of 8 FSS Summary Report F8990471

F8990471 -M0041 GI 1394 F8990471-M004 1GI F8990471-M0042GI F8990471-M0043GI F8990471-M0044GI F8990471-M0045GI F8990471-M0046GI F8990471-M0047G1 F8990471-M0048GI F8990471-MOO49GI F8990471-M0050GI F8990471-M0051GI F8990471-M0052GI F8990471-MOO53GI1 F8990471-M0054GI F8990471-M0056GI F8990471-M0056GI F8990471-M0057GI F8990471 -M005,8GI F8990471-MOO59GI F8990471-M0060GI F8990471-M0061GI F8990471-M0062GI F8990471-M0063GI F8990471-M0063GI F8990471-M0065GI F8990471-M0066GI F8990471-M0067G1 F8990471-M0068GI F8990471-M0069GI F8990471-MOO70GI F8990471-M0071GI S Mean:

Median:

Standard Deviation:

Range:

1394 1431 1488 1441 1408 1400 1431 1376 1377 1082 1036 1334 1426 1431 1380 1349 1376 1348 1.331 1396 1383 1404 1346 1361 1371 1342 1375 1355 1387 1349 1369 1433 1431 93 1036 -1580 Page 5 of 8 FSS Summary Report F8990471

Survey Unit Data Assessment:.'

The survey design required 71 direct measurements for the Sign Test. The critical value and the results of the Sign Test are presented in Table 4. The sample mean and median values were less than the DCGL. The sam ple standard deviation was less than the design standard deviation so no additional samples were requir ed.

Page 6 of 8 FSS Summary Report F8990471

Table 4. Data Assessment Results Survey Results Parameter Value Comment Material Background Used (dpml10O cm 2):

N/A Ambient Background Used (dpm/IOQ cm 2):

N/A Average Ambient BKG = 0 Actual Direct Measurements (N):

71 Median (dpm/100 cm2):

1431 Mean (dpm/100 cm 2):

1433 Direct Measurement Standard Deviation 93 (dpm/100 cm 2):

Total Standard Deviation (dpmn100 cm2):

93 Based on samples and backgrounds.

Maximum (dpm/100, cm 2):

1580 Material Type:

N/A Background Subtract Not Applied Sign Test Final N Value:

71 S+ Value:

71 Critical Value:

42 Sufficient Samples Collected:

Yes Maximum Value < DCGL:

Yes Median Value < DCGL:

Yes Mean Value < DCGL:

Yes Maximum Value < DCGLemc:

N/A Class 3 Total Standard Deviation <= Sigma:

Yes Pass the Sign Test?

Yes Reject the Null Hypothesis?

Yes Does the Survey Unit Pass All Criteria?

Yes Page 7 of 8 FSS Summary Report F8990471

Survey Unit Investigations and Results:

No investigations were required and no investigation results are reported.

ALARA Statement:

As stated in Chapter 4 of the LTP, as long as the residual activity within the survey unit is less than the DCGL (i.e. the survey unit average activity is less than the DCGL), the ALARA criterion has been met.

Changes in Initial Survey Unit Assumptions:

The survey unit was designed as a Class 3 structure survey and the sample results are consistent with that classification. The variability of the survey results was less than the characterization data used for survey design. No potential areas of elevated activity were detected

==

Conclusion:==

The FSS of this survey unit was properly, designed as a Class 3 survey based on Table 5-4 of the LTP. The required number of direct measurements was made and the scan coverage met the requirement of Table 5;6 of the LTP for pipe surveys. No direct measurements exceeded the DCGL of 10'0000 dpm/100 cm2 or the grout limit of 21000dpm/100cm 2. No investigations were required.

The direct measurement data support rejection of the null hypothesis, providing high confidence that the survey unit satisfied the release criteria and that the data quality objectives were met.

It is concluded that survey unit F8990471 meets the release criteria of 10CFR20.1402.

Page 8 of 8 FSS Summary Report F8990471 Maps March 24, 2008 Survey Unit F8990471

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Table 2-1. Survey Unit Instrumentation Instrument Detecto~r MDC Static MDC Scan Model; Serial No.

Model; Serial No.

(dpm/100 cm2 )

(dpmi100 cm2 )

M2350; 203484 44-157; 2151854 1680 N/A Table 2-2. Investigation Criteria and DCGL Value Parameter c

!i (dpm/100 cm2)

Investigation Criteria' Direct 50000 1

Investigation Criteria - Scan N/A DCGLw 100000 DCGLEMC N/A Page 2 of 2 Att. 2 Instrumentation F8990471 Investigation March 24, 2008 SurveylUnit F8990471 (none required)

Data 'Assessment March 24, 2008 Survey! Unit F8990471

0 F8990471 Gross Activity Sample Results Quantile Plot DCGL = 100000 dpm/100cm 2 I

1,800 -

1,600 -

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1,000 -

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