ML100820104

Preliminary RAI - FSAR Chapter 11

ML100820104
Person / Time
Site:	Watts Bar
Issue date:	03/23/2010
From:	Joel Wiebe Watts Bar Special Projects Branch
To:	Arent G, Stockton R Tennessee Valley Authority
Wiebe, Joel NRR/DORL/WBSP, 415-6606
References
Download: ML100820104 (3)

Text

From:

Wiebe, Joel Sent:

Tuesday, March 23, 2010 9:26 AM To:

'Ricky Stockton'; 'Gordon Arent'

Subject:

Preliminary RAI Questions - FSAR Chapter 11

1. Amendment 95 has added three columns of source terms (representing different waste processing configurations) to Table 11.2-5 to the two source terms formerly in the corresponding table in FSAR Amendment 89.

a. Provide a full definition of the terms in the header of these columns, and a full discussion of the plant configuration they represent.

b. Columns 1 and 2 of Table 11.2-5 refer to processing by MC. Should they read processing by MD, as in Mobile demineralizers? If so correct, if not define MC.

c. The added source term columns do not appear to be used in the FSAR safety analysis. Two of the three source terms indicate that they do not meet the total curie limit in RM 50-2 annex to Appendix I. Explain the purpose for including this revised Table 11.2-5 in the FSAR.

2. Amendment 95 has revised the entries in Table 11.2-5a and 11.2-5b for every isotope listed. These tables take the source term from the first two columns of Table 11.2-5 and calculate the sum of the fractional release values to demonstrate compliance with the public dose limit by the method provided in 10 CFR 20.1302(b).

a. However, the total sum of the C/CEL in Table 11.2-5a (1.343) indicates that operating one unit exceeds the requirements of 10 CFR 20.1302 (e.g., the sum is greater than 1.0). Provide a basis for why this mode of operation is acceptable.

b. The revised Table 11.2-5 has fourteen isotopes in the source term spectrum that have not been included in Tables 11.2-5a and 11.2-5b. These are, Na-24, Fe-55, Zn-65, Y-91m, Y-93, Te-99m [sic - Tc-99m?], Ru-103, Ru-106, Te-129m, Te-129, Te-131m, Te-131, Ce-141, and Ce-143. Provide a basis for not including these isotopes in Tables 11.2-5a and 11.2-5b.

c. Provide an explanation of the values listed in the third columns of Tables 11.2-5a and 11.2-5b (e.g., the Des/Exp Ratio) and explain how they are used in the calculation of the C/CEL sum.

d. Verify that the subtitle to Table 11.2-5b should read With Processing of the Condensate Resin

3. Table 11.2-7

a. Provide a basis for concluding that the doses to members of the public presented in the table for the year 2040, are bounding and conservative for current plant operation.

b. Verify that the individual doses listed in the table are to the maximum exposed individual in each group.

c. Identify the specific source term, models, parameters, and assumptions used in calculating these values.

4. Verify that the land-use census that is reflected in Table 11.3-9 is still valid or provide a basis for concluding that the analysis based on this information is bounding and conservative.

5. Amendment 95 revised the gaseous release estimates in Tables 11.3-8a and 11.3-8b.

The revised value for the designed release of I-131 indicated in both tables is

approximately 8 Ci/yr/unit. Provide a basis for why Watts Bar meets the RM 50-2 limit for I-131 release of 1.0 Ci/yr/unit.

6. Provide the headers for the columns in Table 11.3a and discuss the significance of this table and how it differs from the source term provided in Table 11.3-8.

7. Describe the source term used to calculate the doses listed in Table 11.3-11.

Amendment 95 resulted in lower values for the Total Body and Skin doses. Describe what factors changed with Unit 2 operation that resulted in these lower revised values.

8. Verify that Watts Bar is committed to meeting the limits in Docket RM 50-2 in lieu of the cost benefit requirement as provided in 10 CFR 50 Appendix I Section II D.

The staff has also identified the following typographical errors:

1. Section 11.2.3.1, "Component Design," states in part: "design parameters are given in Table 11.2-3." A review of the tables associated with Section 11.2 indicates that this should be Table 11.2-2.

2. Section 11.2.3.1, "Component Design," states under both "High Crud Pumps" and "Neutralization Tank Pumps": "Two gpm pumps" A review of Table 11.2-2 indicates that these pumps have higher flow rates.

3. Section 11.2.9.1, "Assumptions and Calculational Methods," in subsection (2) references Table 11.2-10. The staff is unable to find Table 11.2-10. It appears the correct reference is Table 11.2-6.

4. Section 11.2.9.2, "Summary of Dose from Radionuclides in Liquid Effluent," refers to Table 11.2-6. This table contains no dose information. It appears that the correct reference in Amendment 95 is Table 11.2-7.

5. The references to tables 11.2-4, 11.2-4a and 11.2-4b in FSAR section 11.2.6.5, and to table 11.2-5 in FSAR section 11.2.9.1, appear to be incorrect.

6. The title to Table 11.2-4 indicates that there are four pages to the table. However, only one page of the table is included in the FSAR.

7. Table 11.2-7 has change bars indicating Amendment 95 updates; however, the page header indicates that this page has not been revised since Amendment 89.

8. The tables referenced in section 11.3.7.5 of the FSAR appear to be erroneous (no Table 11.3-8c is included).

9. Table 11.3-9 has change bars indicating Amendment 95 updates; however, the page header indicates that this page has not been revised since Amendment 89.

10. Table 11.3-4 indicates sheet 1 of 2. No sheet 2 is provided.

11. Table 11.3-5 indicates sheet 2 of 2. No sheet 1 is provided.

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Subject:

Preliminary RAI Questions - FSAR Chapter 11 Sent Date: 3/23/2010 9:26:15 AM Received Date: 3/23/2010 9:26:00 AM From: Wiebe, Joel Created By: Joel.Wiebe@nrc.gov Recipients:

RAStockton@tva.gov ('Ricky Stockton')

Tracking Status: None GArent@tva.gov ('Gordon Arent')

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