ML101730200

Chemical Effects Summary Related to RAI Response to GL-2004-02

ML101730200
Person / Time
Site:	Waterford
Issue date:	06/17/2010
From:	Entergy Operations
To:	Office of Nuclear Reactor Regulation
Kalyanam N, NRR/DORL/LPL4, 415-1480
Shared Package
ML101730180	List: ML101730190 ML101730195 ML101730200
References
GL-04-002, TAC MC4729
Download: ML101730200 (2)

Text

Waterford 3 Chemical Effects Summary The evaluation of chemical effects involves a two step process. The first step is to determine the plant specific chemical precipitate loading utilizing the WCAP-16530 model. The second step is to perform plant specific head loss testing utilizing the WCAP-16530 precipitate loading. This summary document only addresses the first step of this process.

Waterford 3 chemical effects precipitate loading was analyzed by Alion Science & Technology utilizing the guidance provided in WCAP-16530 and version 1.1 of the associated spreadsheet tool. Plant specific inputs were used in a conservative manner to maximize precipitate loading. The following three notable conservatisms are applied to the analysis.

The sump is assumed to not be mixed throughout the model. The difference in precipitate generation between assuming a mixed pool and non-mixed pool is small; however, assuming a non-mixed pool conservatively maximizes the amount of material dissolved and thus maximizes the amounts of precipitates generated.

Per WCAP-16530 Section 6.4, due it was assumed that all dissolved aluminum will form precipitates.

To account for NRC observations and recommendations in the SER of WCAP-16530 regarding the use of a time-based aluminum dissolution analysis, the release rate of aluminum is doubled in the analysis for the first 15 days for both submerged and unsubmerged metallic aluminum to bound the ICET 1 test data.

Table 1 list the Waterford 3 specific input utilized in the analysis. Based on the results of the WCAP-16530 analysis of the WF3 debris load and post-LOCA containment sump chemistry, aluminum is the limiting reactant in the formation of sodium aluminum silicate, and no aluminum oxyhydroxide is formed. The corrosion/dissolution sources contributing to elemental release quantities and precipitates for the limiting case (Maximum volume, Maximum pH) are included as Figure 1 and Figure 2. Nukon and MEI, which are composed of E-Glass, are the primary sources of calcium and silicon. The TSP buffer reacts with the dissolved calcium released from E-glass, as well as from concrete, to form calcium phosphate precipitate. Unsubmerged aluminum is the primary source of dissolved aluminum, followed by E-glass and submerged aluminum.

Parameter Value Time of Recirculation Actuation 3253.19 sec Time at which spray is terminated 30 days Max. Recirculation Water Volume 102,810 ft³ Min. Recirculation water Volume 42,938 ft³ Buffering Agent TSP Boric Acid Concentration of RWSP 2040 - 2900 ppm Maximum Sump pH 8.1 Minimum Sump pH 7.1 (1h - 10d); 7.0 (20d - 30d) Metallic Aluminum Submerged 10 ft² / 10 lb Unsubmerged 140 ft² / 340 lb Fiberglass Insulation (MEI/Nukon/Latent) 786.23 ft³ Silica Powder (Min-K/Microtherm) 4.6 ft³ Concrete (exposed & submerged total) 81,558 ft² Aluminum Silicate None Calcium Silicate None Table 1: Plant Specific Inputs

Figure 1: Elemental Release by Material Figure 2: Precipitate by Material 0.0010.0020.0030.0040.0050.0060.0070.0080.0090.00100.00Ca3(PO4)2NaAlSi3O8AlOOH M a s s (k g)PrecipitateContributions to Precipitates by MaterialConcreteSilica PowderE-GlassMetallic Aluminum Not-SubmergedMetallic Aluminum SubmergedMaterial Class Ca 3(PO 4)2NaAlSi 3 O 8AlOOHMetallic Aluminum Submerged0.001.360.00Metallic Aluminum Not-Submerged0.0024.760.00E-Glass47.7061.020.00Silica Powder0.001.000.00Concrete2.910.340.00Precipitate (kg) 0.0020.0040.0060.0080.00100.00120.00140.00160.00180.00 Ca Si Al R e l e a s e (k g)ElementContribution to Elemental Releases by Each MaterialConcreteSilica PowderE-GlassMetallic Aluminum Not-SubmergedMetallic Aluminum SubmergedReleases in kgMaterial Class Ca Si AlMetallic Aluminum Submerged0.000.000.28Metallic Aluminum Not-Submerged0.000.005.09Calcium Silicate0.000.000.00E-Glass18.49157.403.69Silica Powder0.003.670.00Concrete1.130.570.04Release (kg) Mass (kg)