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Direct measurements were made of the interior surfaces of the system piping which confirmed the presence of plant-derived radionuclides.
Direct measurements were made of the interior surfaces of the system piping which confirmed the presence of plant-derived radionuclides.
Direct measurements of the interior showed a mean gross activity level of 480,508 dpm/100 cm 2 and a maximum value of 3,412,000 dpm/100 cm'. Based on the classification procedure (DSIP-0020) and levels of gross activity reported, the system was determined to be a Class 1 system.HSA Events: N/A Radioactive by design.Survey Unit Design Information:
Direct measurements of the interior showed a mean gross activity level of 480,508 dpm/100 cm 2 and a maximum value of 3,412,000 dpm/100 cm'. Based on the classification procedure (DSIP-0020) and levels of gross activity reported, the system was determined to be a Class 1 system.HSA Events: N/A Radioactive by design.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  
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 were spaced at 15 cm intervals and 49 ml were scanned for 100% 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 I I FSS Summary Report F8990111 Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area: F899 Survey Unit: Class: SU Area (m): Evaluator:
: 1. Direct measurement locations were spaced at 15 cm intervals and 49 ml were scanned for 100% 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 I I FSS Summary Report F8990111 Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area: F899 Survey Unit: Class: SU Area (m): Evaluator:
DCGL (dpmIIO00 cm 2): Area Factor: Design DCGLemc (dpm/100 cm 2): LBGR (dpm/100 cm 2): Design Sigma (dpm/I00 cm 2): Type I Error: Type II Error: Predominant Nuclide: Sample Area (M 2): Scan Area (m 2): Scan Coverage (%): Zl-, : Zl-0 : Sign P: Calculated Relative Shift: Relative Shift Used: N-Value: Design N-Value + 20%: Design Min Samples N: Grid Spacing L: 0111 1 49 Erin L. Brown 100000 1 100000 50000 15498 0.05 0.05 Cs-137 N/A 49 100%1.645 1.645 0.99865 3.3 3 11 14 14 1.8 Decay Heat Drains Reactor Building Structure Surface LTP Table 5-4 Gross Activity DCGL Class 1 Class 1 Default = 50% DCGL Embedded Pipe Class 1 Uses 3.0 if Relative Shift is>3 NIJREG-1575 Table 5-5 Class 1 Class I Page 3 of I11 FSS Summary Report F89901 11 Survey Results: A total of 227 direct measurements were made in F8990 111. 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.Survey activity ranged from 10024 .to 44824 dpm/1 00 cm 2 , based on the pipe detector efficiency.
DCGL (dpmIIO00 cm 2): Area Factor: Design DCGLemc (dpm/100 cm 2): LBGR (dpm/100 cm 2): Design Sigma (dpm/I00 cm 2): Type I Error: Type II Error: Predominant Nuclide: Sample Area (M 2): Scan Area (m 2): Scan Coverage (%): Zl-, : Zl-0 : Sign P: Calculated Relative Shift: Relative Shift Used: N-Value: Design N-Value + 20%: Design Min Samples N: Grid Spacing L: 0111 1 49 Erin L. Brown 100000 1 100000 50000 15498 0.05 0.05 Cs-137 N/A 49 100%1.645 1.645 0.99865 3.3 3 11 14 14 1.8 Decay Heat Drains Reactor Building Structure Surface LTP Table 5-4 Gross Activity DCGL Class 1 Class 1 Default = 50% DCGL Embedded Pipe Class 1 Uses 3.0 if Relative Shift is>3 NIJREG-1575 Table 5-5 Class 1 Class I Page 3 of I11 FSS Summary Report F89901 11 Survey Results: A total of 227 direct measurements were made in F8990 111. 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.Survey activity ranged from 10024 .to 44824 dpm/1 00 cm 2 , based on the pipe detector efficiency.
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The FSS of this survey unit was properly designed as a Class 1 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 the LTP for pipe surveys. No direct measurements exceeded the DCGL of 100000 dpm/100 cm 2.No investigations we:re 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 F89901 11 meets the release criteria of 1OCFR20.1402.
The FSS of this survey unit was properly designed as a Class 1 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 the LTP for pipe surveys. No direct measurements exceeded the DCGL of 100000 dpm/100 cm 2.No investigations we:re 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 F89901 11 meets the release criteria of 1OCFR20.1402.
Page 11 of 11 FSS Summary Report F89901 11 Attachment I Maps November 10, 2008 Survey Unit F8990111  
Page 11 of 11 FSS Summary Report F89901 11 Attachment I Maps November 10, 2008 Survey Unit F8990111  
-e 0 00 SCALE METERS PLANVIEW*su SACRAMENTO MUNICI PAL UTILITY DISTRICT REACTOR BUILDING EL. -25'DECAY HEAT PIPING F89901 11-M1  
-e 0 00 SCALE METERS PLANVIEW*su SACRAMENTO MUNICI PAL UTILITY DISTRICT REACTOR BUILDING EL. -25'DECAY HEAT PIPING F89901 11-M1
('D 0 00 0 PIPING  
('D 0 00 0 PIPING  


Revision as of 00:29, 12 July 2019

Final Status Survey Summary Report, November 10, 2008 Decay Heat Drains Reactor Building Survey Unit F8990111
ML090980392
Person / Time
Site: Rancho Seco
Issue date: 11/10/2008
From:
Sacramento Municipal Utility District (SMUD)
To:
NRC/FSME
Shared Package
ML090830613 List: ... further results
References
DPG 09-097
Download: ML090980392 (21)
v • d • e


Text

Rancho Seco Final Status Survey Summary Report November 10, 2008 Decay Heat Drains Reactor Building Survey Unit F8990111 Prepared By: 626w, L. Date:_Il//0 2,308 FSS Engineer Reviewed By: Date: (U (O(O Lead FSS Engineer Approved By: -' Date: __- ?-Dismantlement Sup ntendent, Radiological FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit: F89901 11, Decay Heat Drains Reactor Building Survey Unit

Description:

Operating History: This system transported contaminated reactor coolant water through the heat exchangers which removed reactor decay heat during shutdown conditions.

This system was known to be contaminated.

Operating records and the HSA document the occurrence 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 presence of plant-derived radionuclides.

Direct measurements of the interior showed a mean gross activity level of 480,508 dpm/100 cm 2 and a maximum value of 3,412,000 dpm/100 cm'. Based on the classification procedure (DSIP-0020) and levels of gross activity reported, the system was determined to be a Class 1 system.HSA Events: N/A Radioactive by design.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 were spaced at 15 cm intervals and 49 ml were scanned for 100% 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 I I FSS Summary Report F8990111 Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area: F899 Survey Unit: Class: SU Area (m): Evaluator:

DCGL (dpmIIO00 cm 2): Area Factor: Design DCGLemc (dpm/100 cm 2): LBGR (dpm/100 cm 2): Design Sigma (dpm/I00 cm 2): Type I Error: Type II Error: Predominant Nuclide: Sample Area (M 2): Scan Area (m 2): Scan Coverage (%): Zl-, : Zl-0 : Sign P: Calculated Relative Shift: Relative Shift Used: N-Value: Design N-Value + 20%: Design Min Samples N: Grid Spacing L: 0111 1 49 Erin L. Brown 100000 1 100000 50000 15498 0.05 0.05 Cs-137 N/A 49 100%1.645 1.645 0.99865 3.3 3 11 14 14 1.8 Decay Heat Drains Reactor Building Structure Surface LTP Table 5-4 Gross Activity DCGL Class 1 Class 1 Default = 50% DCGL Embedded Pipe Class 1 Uses 3.0 if Relative Shift is>3 NIJREG-1575 Table 5-5 Class 1 Class I Page 3 of I11 FSS Summary Report F89901 11 Survey Results: A total of 227 direct measurements were made in F8990 111. 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.Survey activity ranged from 10024 .to 44824 dpm/1 00 cm 2 , based on the pipe detector efficiency.

Table 2. Direct Measurement Results Measurement ID Gross Activity (dpm/100 cm)F8990111-MOO01GI 12284 F89901 11 -MOO02GI 13066 F8990111-MOO03GI 15075 F8990111-MOO04GI 18099 F8990111-MOO05GI 21841 F8990111-MOO06GI 28894 F8990111-MOO07GI 37338 F8990111-MOO08GI 44824 F8990111-MOO09GI 37274 F8990111-MOOIOGI 32526 F8990111-MOO11GI 31363 F8990111-MOO12GI 30305 F8990111-MOO13GI 26612 F8990111-MOO14GI 24802 F8990111-MOO15GI 23759 F8990111-MOO16GI 22902 F8990111-MOO17GI 21549 F8990111-MOO18GI 20522 F8990111-MOO19GI 20086 F8990111-MOO20GI 19273 F8990111-MOO21GI 18889 F8990111-M0022GI 18646 F8990111-M0023GI 18412 F8990111-M0024GI 17833 F8990111-M0025GI 18676 F8990111-M0026GI 20982 F8990111-M0027GI 24705 F8990111-M0028GI 28962 F8990111-M0029GI 27938 F8990111-MOO30GI 24215 F8990111-MOO31GI 22750 F8990111-M0032GI 25178 F8990111-M0033GI 27911 F8990111-M0034GI 29611 F8990111-M0035GI 33970 F8990111-M0036GI 38618 F8990111-M0037GI 39483 F8990111-M0038GI 38366 F8990111-M0039GI 34393 F8990111-MOO40GI 27850 Page 4 of 11 FSS Summary Report F89901 11 F8990111-M0041GI 22426 F8990111 -M0042GI 18962 F8990111-M0043GI 18026 F8990111-M0044GI 17379 F8990111-M0045GI 16820 F8990111-M0046GI 17263 F8990111-M0047GI 17520 F8990111-M0048GI 18493 F8990111-M0049GI 19584 F8990111-MOO50GI 20004 F8990111-MOO51GI 18617 F8990111-M0052GI 18262 F8990111-M0053GI 18556 F8990111-M0054GI 18616 F8990111-M0055GI 19691 F8990111-M0056GI 20728 F8990111-M0057GI 24040 F8990111-M0058GI 23886 F8990111-M0059GI 24870 F8990111-MOO60GI 26692 F8990111-MOO61GI 28638 F8990111-M0062GI 30437 F8990111-M0063GI 33051 F8990111-M0064GI 34653 F8990111-M0065GI 31202 F8990111-M0066GI 34755 F8990111-M0067GI 37259 F8990111-M0068GI 37481 F8990111-M0069GI 34480 F8990111-MOO70GI 31747 F8990111-MOO71GI 32166 F8990111-M0072GI 28260 F8990111-M0073GI 30612 F8990111-M0074GI 29633 F8990111-M0075GI 28592 F8990111-M0076GI 30235 F8990111-M0077GI 32902 F8990111-M0078GI 30779 F8990111-M0079GI 32286 F8990111-MOO80GI 28675 F8990111-MOO81GI 28393 F8990111-M0082GI 28210 F8990111-M0083GI 28988 F8990111-M0084GI 26514 F8990111-M0085GI 26504 F8990111-M0086GI 24184 F8990111-M0087GI 25945 F89901 11 -M0088GI 29699 F8990111-M0089GI 32267 F8990111-MOO90GI 30896 F8990111-MOO91GI 28210 F8990111-M0092GI 27316 F8990111-M0093GI 25980 F8990111-M0094GI 24271 F8990111-M0095GI 27264 F89901 11 -M0096GI 28682 Page 5 of I11 FSS Summary Report F89901 11 F8990111-M0097GI 29249 F8990111-M0098GI 27863 F8990111-M0099GI 24856 F8990111-MO100GI 22701 F8990111-MO101GI 21669 F8990111-MO102GI 21352 F8990111-MO103GI 20480 F8990111-MO104GI 19256 F8990111-MO132GI 10024 F8990111-M0133GI 12758 F8990111-M0134GI 17502 F8990111-M0135GI 17744 F8990111-M0136GI 16861 F8990111-M0137GI 16771 F8990111-M0138GI 16960 F8990111-M0139GI 18821 F8990111-MO140GI 20165 F8990111-MO141GI 21464 F8990111-M0142GI 21263 F8990111-M0143GI 21197 F8990111-M0144GI 21366 F8990111-M0145GI 21727 F8990111-M0146GI 22949 F8990111-M0147GI 23716 F8990111-M0148GI 26965 F8990111-M0149GI 28351 F8990111-MO150GI 26516 F8990111-MO151GI 37003 F8990111-MO152GI 36558 F8990111-MO153GI 37452 F8990111-MO154GI 39794 F8990111-MO155GI 38062 F8990111-M0156GI 28767 F8990111-M0157GI 25855 F8990111-M0158GI 23788 F8990111-M0159GI 23344 F8990111-MO160GI 22379 F8990111-MO161GI 21792 F8990111-M0162GI 20121 F8990111-M0163GI 17193 F8990111-M0164GI 15517 F8990111-MO165GI 15265 F8990111-M0166GI 15488 F8990111-M0167GI 15488 F8990111-MO168GI 15948 F8990111-MO169GI 17802 F8990111-MO170GI 17814 F8990111-MO171GI 17112 F8990111-M0172GI 16745 F8990111-M0173GI 15208 F8990111-M0174GI 14503 F8990111-M0175GI 14673 F8990111-M0176GI 14581 F8990111-M0177GI 14446 F8990111-M0178GI 13818 F8990111-M0179GI 12965 Page 6 of I11 FSS Summary Report F89901 11 F8990111-MO180GI 13191 F8990111-MO181GI 12912 F8990111-M0182GI 12774 F8990111-MO183GI 12605 F8990111-M0184GI 11888 F8990111-M0185GI 11943 F8990111-M0186GI 11984 F8990111-M0187GI 12100 F8990111-M0188GI 12339 F8990111-M0189GI 12508 F8990111-MO190GI 12467 F8990111-MO191GI 12946 F8990111-M0192GI 13352 F8990111-M0193GI 13587 F8990111-M0194GI 13982 F8990111-M0195GI 15341 F8990111-M0196GI 18119 F8990111-M0197GI 22070 F8990111-MO198GI 24848 F8990111-M0199GI 27184 F8990111-MO200GI 30387 F8990111-MO201GI 32333 F8990111-M0202GI 31002 F8990111-M0203GI 27034 F8990111-M0204GI 21012 F8990111-M0205GI 18743 F8990111-M0206GI 18648 F8990111-M0207GI 18033 F8990111-M0208GI 18386 F8990111-M0209GI 19883 F8990111-MO210GI 21022 F8990111-MO211GI 21405 F8990111-M0212GI 22996 F8990111-M0213GI 24141 F8990111-M0214GI 24497 F8990111-M0215GI 26433 F8990111-M0216GI 26274 F8990111-M0217GI 26329 F8990111-M0218GI 25898 F8990111-M0219GI 22279 F8990111-M0220GI 19479 F8990111-M0221GI 17524 F8990111-M0222GI 16657 F8990111-M0223GI 16728 F8990111-M0224GI 16291 F8990111-M0225GI 16670 F8990111-M0226GI 16825 F8990111-M0227GI 16411 F8990111-M0228GI 15854 F8990111-M0229GI

-14952 F8990111-M0230GI 14541 F8990111-M0231GI 15166 F8990111-M0232GI 15994 F8990111-M0233GI 17710 F8990111-M0234GI 17826 F8990111-M0235GI 17588 Page 7 of I1I FSS Summary Report F8990111 F8990111-M0236GI F8990111-M0237GI F89901 11 -M0238GI F8990111-M0239G[

F8990111-M0240GI F8990111-M0241GI F8990111-M0242GI F8990111-M0243GI F89901 11-M0244GI F8990111-M0245GI F8990111-M0246GI F8990111-M0247GI F8990111-M0248GI F8990111-M0249GI F8990111-M0250GI F8990111-M0251GI F8990111-M0252GI F8990111-M0253GI F8990111-M0254GI Mean: Median: Standard Deviation:

Range: 17383 17600 18449 19327 19051 18494 18061 17467 17650 18383 19377 20741 21704 21349 19520 18410 17955 18151 18580 22512 21022 6987 10024-44824 Page 8 of I I FSS Summary Report F89901 11 Survey Unit Data Assessment:

The survey design required 227 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 sample standard deviation was less than the design standard deviation so no additional samples were required.Page 9 of 11 FSS Summary Report F8990111 Table 4. Data Assessment Results Survey Results Parameter Value Comment.Material Background Used (dpm/100 cm 2): N/A Ambient Background Used (dpm/100 cm 2): N/A Average Ambient BKG = 0 Actual Direct Measurements (N): 227 Median (dpm/100 cm 2): 21022 Mean (dpm/100 cm 2): 22512 Direct Measurement Standard Deviation 6987 (dpm/lO0 cm 2): Total Standard Deviation (dpm/100 cm 2): 6987 Based on samples and backgrounds.

Maximum (dpm/100 cm 2): 44824 Material Type: N/A Background Subtract Not Applied Sign Test Final N Value: 227 S+ Value: 227 Critical Value: 126 Sufficient Samples Collected:

Yes Maximum Value < DCGL: Yes Median Value < DCGL: Yes Mean Value < DCGL: Yes Maximum Value < DCGLemc: Yes Class 1 Total Standard Deviation

<= Sigma: Yes Pass the Sign Test? Yes Reject the Null Hypothesis?

Yes Does the Survey Unit Pass All Criteria?

Yes Page 10 of I I FSS Summary Report F8990111 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 and the EMC criterion has been met), the ALARA criterion has been met.Changes in Initial Survey Unit Assumptions:

The survey.unit was designed as a Class 1 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 1 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 the LTP for pipe surveys. No direct measurements exceeded the DCGL of 100000 dpm/100 cm 2.No investigations we:re 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 F89901 11 meets the release criteria of 1OCFR20.1402.

Page 11 of 11 FSS Summary Report F89901 11 Attachment I Maps November 10, 2008 Survey Unit F8990111

-e 0 00 SCALE METERS PLANVIEW*su SACRAMENTO MUNICI PAL UTILITY DISTRICT REACTOR BUILDING EL. -25'DECAY HEAT PIPING F89901 11-M1

('D 0 00 0 PIPING

SUMMARY

.... LEN AREA I8"0 125 LF 53 SM*smuI SACRAMENTO MUNICIPAL UTILITY DISTRICT REACTOR BUILDING EL. -25'DECAY HEAT PIPING ISOMETRIC F89901 11 -M2 99011 SHEET I OF 1 RC R.FILE: FS5 AYMOND Attachment 2 Instrumentation November 10, 2008 Survey Unit F8990111 Table 2-1. Survey Unit Instrumentation Instrument Detector MDC Static MDC Scan Model; Serial No. Model; Serial No. (dpm/100 cm 2) (dpm/100 cm 2)M2350; 142512 44-162; L206935 2590 N/A The MDC noted for the detector' model 44-162 the actual survey performed.

is for the 18" diameter piping which was Table 2-2. Investigation Criteria and DCGL Value Parameter Value (dpm/100 cm 2)Investigation Criteria -Direct 100000 Investigation Criteria -Scan N/A DCGLW 100000 DCGLEMC N/A Page 2 of 2 Att. 2 Instrumentation F89901 11 Attachment 3 Investigation November 10, 2008 Survey Unit F8990111 (none required)

Attachment 4 Data Assessment November 10, 2008 Survey Unit F8990111 F89901 11 Gross Activity Sample Results Quantile Plot 0 DCGL = 100000 dpm/1 00cm 2 50,000 ;45,000 35,000>, 21022 10,000 0~~- --------T .1 0 20 40 60 80 100 Percentile

  • I+ Direct Measurements (dpm/100cm2) median ---75th Percentile

--50th Percentile GO (D 0 F8S90111 Gross Activity Sample Results Scatter Plot DCGL = 100000 dpm/1O0cmr 4D W Ch CD Ca CD 00 00-a 50000 45000-C4 40000 E 35000 e30000 a.25000 20000- 18000<10000 5000 0------------------------------------------

-- ------- ----tZOo 00 000 X or 0 0 Oo 0 0 0 43472 22512 I55C RHN ON!11illu!Hllyy!Nl11!1wli1 N i Ul ; ii ;Nil!1It2 tmutl~JP~Ihl~

l'p Measurement Locations I o Gross Activity Average --"+3StDev" --"-3StDev" i (D~CD~F89901 11 Gross Activity Frequency Plot DCGL = 100000 dpm/1 00crrm 61)L.IL 45 40 35 30 25 20 15 10 5 I-'CNI (NJ N-Co I0 00\0 Bins -Upper End Value (dpm/1 00cm2)

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