ML051950089

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Calculation E900-05-023, Rev 1, Miscellaneous Chain Link Fences MA9 - Survey Design.
ML051950089
Person / Time
Site: Saxton File:GPU Nuclear icon.png
Issue date: 06/09/2005
From: Cooper W, Paynter A, Tritch T
GPU Nuclear Corp
To:
Document Control Desk, Office of Nuclear Reactor Regulation
Shared Package
ML051950082 List:
References
E900-05-023, Rev 1
Download: ML051950089 (3)


Text

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SNEC CALCULATION COVER SHEET

-. - - . CALCULATION DESCRIPTION  :-

Calculation Number Revision Number Effective Date Page Number E900-05-023 I I of I Subj&td Miscellaneous Chain Link Fences MA9- Survey Design Question 1 - Is this calculation defined as In QA Scope'? Refer to definition 3.5. Yes 0 No I]

Question 2- Is this calculation defined as a 'Design Calculation ? Refer to definitions 3.2 and 3.3. Yes 0 No El NOTES: If a 'Yes' answer is obtained for Question 1. the calculation must meet the requirements of the SNEC Facility Decommissioning Quality Assurance Plan. If a 'Yes' answer is obtained for Question 2, the Calculation Originators Immediate supervisor should not review the calculation as the Technical Reviewer.

DESCRIPTION OF REVISION Revision 1 adds attachments 2-2 and 2-3 (attached) to provide explanation of surrogate DCGL logic.

APPROVAL SIGNATURES T

I' I I.

I I D

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DCGLw Calculation Logic Survey Unit: Remaining Chain Link Fences MA9, Class 2 and 3 Area

Description:

The purpose of this calculation is to determine a representative mix from available sample analyses results for the Chain Link Fences. The effective surface DCGLw is then determined in accordance with guidance provided by the SNEC License Termination Plan (LTP) and MARSSIM.

Ill. Data Selection Logic Tables: The radionuclide selection logic and subsequent DCGLw calculations are provided in the' tables described below.

These tables were developed using' Microsoft' Excel and are validated in SNEC calculation E900-03-012. Table explanations follow:

Attachment 2-2: Data Listing - This table provides a list of the most representative sample analyses from the'orginal SNEC land area. Since the fences are throughout the site, is not expected to have activity in excess of the DCGLw, but contamination 'on the fences would be most likely in the SNEC yard area, mix data from the SNEC yard is chosen to represent the fence contamination. Results are from scoping and characterization surveys. The samples consist of soil media that was taken in support of the aforementioned surveys. As applicable, a sample number, sample location, description, ra'dionuclide concentration, and analysis date are provided for each sample.

Table 3 on Attachment 2-2 lists applicable sample results, decay corrected to 2004.

Table 4 on Attachment 2-2 shows the mean % of the total activity contributed by each isotope. These' values (bottom of table 4) are then used in Attachment 2-1 to derive the weighted adjusted surrogate DCGLw.

Attachment 2-1: Effective'DCGLw Calculator for Cs-137 (in dpm/1 OOcm 2)

- This table provides the surrogate Cs-I 37 DCGLw'calculation results for data derived from Attachrment 2-2. It uses the ratios between the nuclides weighted for the DCGLs to determine an effective surrogate Cs137 DCGL.

[. e v .uma IV. Summary - Since the survey area is chain link fence, the release limit is based on the surface DCGLw. Using thie above logic tables the calculated

' Cs-137 surface DCGLw is 26445 dpmon00cm 2. This value would be reduced by 25% as part of the'SNEC facilities requirement to apply an administrative limit of 19834 dpmrioocm2 as discussed in the Ucense Termination Plan (LTP).

Attachment 2-3

'- E900-05-023