ML102700539

Scan Action Limits

ML102700539
Person / Time
Site:	Humboldt Bay
Issue date:	09/17/2010
From:	- No Known Affiliation
To:	NRC/FSME
References
Download: ML102700539 (6)

Text

Scan Action Limits (ALs): Rock Wool Insulation Radionuclide Waste Limita Scan Action Levelb (pCi/g)

(dpm/100 cm 2)

Cs-137 15.0 1,400 Co-60 5.0 480 Sr-90 1.0 95 Eu-152 1.0 95 Eu-154 1.0 95 Ag-108m 0.1 10 aValue from Table 1 in PG&E Letter HBL-10-003.

bValue based on mass-weighted density assuming 98% rock wool insulation and 2%

asbestos-cement sheet. Value shown has been rounded down to 2 significant digits.

Relative Fractionsa:

Radionuclide-of-Concern Average (pCi/g)

Relative Fraction Cs-1 37 7.96 0.9583 Co-60 0.350.0417 aBased on positive Cs-1 37 and Co-60 results for samples collected from Units 1 and 2, as reported in Table 4-7 in Radiological Characterization Report, Humboldt Bay Power Plant [ref j.

The gross activity limit for scans was determined through the application of MARSSIM equation 4-4" Gross activity scan limit = 1/7(fl/limitl+ f2/limit 2 +.... fn/limitn)

For the Cs-Co mix associated with the fuel oil system, the gross activity scan limit is:

Gross activity scan limit = 1/Z(0.9583/1,400 + 0.0417/480) = 1,296 dpm/1OOcm 2

Scan ALs: Ventilation Radionuclide Waste Limita Scan Action Levelb (pCi/g)

(dpm/100 cm 2)

Cs-1 37 15.0 44,600 Co-60 5.0 14,800 Sr-90 1.0 2,900 Eu-152 1.0 2,900 Eu-154 1.0 2,900 Ag-108m 0.1 290 aValue from Table 1 in PG&E Letter HBL-10-003.

bValue based on density for aluminum. Value shown has been rounded down to 2 significant digits.

Relative Fractionsa:

Radionuclide-of-Concern Average (pCi/g)

Relative Fraction Cs-1 37 7.96 0.9583 Co-60 0.35 0.0417 aBased on positive Cs-1 37 and Co-60 results for samples collected from Units 1 and 2, as reported in Table 4-7 in Radiological Characterization Report, Humboldt Bay Power Plant [ref j.

The gross activity limit for scans was determined through the application of MARSSIM equation 4-4" Gross activity scan limit = 1/7(fl/limitl+ f2/limit 2 +.... fn/limitn)

For the Cs-Co mix associated with the fuel oil system, the gross activity scan limit is:

Gross activity scan limit = 1/Z(0.9583/44,600 + 0.0417/14,800) = 41,145 dpm/1OOcm 2

Scan ALs: Steel Radionuclide Waste Limita Scan Action Levelb (pCi/g)

(dpm/100 cm 2)

Cs-137 15.0 130,000 Co-60 5.0 44,000 Sr-90 1.0 8,800 Eu-152 1.0 8,800 Eu-154 1.0 8,800 Ag-108m 0.1 880 aValue from Table 1 in PG&E Letter HBL-10-003.

bValue based on density of iron. Value shown has been rounded down to 2 significant digits.

Relative Fractionsa:

Radionuclide-of-Concern Average (pCi/g)

Relative Fraction Cs-1 37 7.96 0.9583 Co-60 0.35 0.0417 aBased on positive Cs-137 and Co-60 results for samples collected from Units 1 and 2, as reported in Table 4-7 in Radiological Characterization Report, Humboldt Bay Power Plant [ref j.

The gross activity limit for scans was determined through the application of MARSSIM equation 4-4" Gross activity scan limit = 1/y(fl/limitl+ f2/limit 2 +.... fn/limitn)

For the Cs-Co mix associated with the fuel oil system, the gross activity scan limit is:

Gross activity scan limit = 1/Z(0.9583/130,000 + 0.0417/44,000) = 120,169 dpm/1OOcm 2

Scan ALs: DAW Radionuclide Waste Limita Scan Action Level" (pCi/g)

(dpm/100 cm2)

Cs-137 15.0 14,000 Co-60 5.0 4,900 Sr-90 1.0 990 Eu-152 1.0 990 Eu-154 1.0 990 Ag-108m 0.1 90 aValue from Table 1 in PG&E Letter HBL-1 0-003.

bValue based on assigned density equal to 55 lbs per cubic foot (PG&E Letter HBL-1 0-0030. Value shown has been rounded down to 2 significant digits.

Relative Fractionsa:

Radionuclide-of-Concern Average (pCi/g)

Relative Fraction Cs-137 7.96 0.9583 Co-60 0.35 0.0417 aBased on positive Cs-1 37 and Co-60 results for samples collected from Units 1 and 2, as reported in Table 4-7 in Radiological Characterization Report, Humboldt Bay Power Plant [ref j.

The gross activity limit for scans was determined through the application of MARSSIM equation 4-4" Gross activity scan limit = 1/y(fl/limitl+ f2/limit 2 +.... fn/limitn)

For the Cs-Co mix associated with the fuel oil system, the gross activity scan limit is:

Gross activity scan limit = 1/Z(0.9583/14,000 + 0.0417/4,900) = 12,990 dpm/1OOcm 2

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