ML14206A993

Conrete Bench-Top Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant. CCNPP-CHLE-010, Revision 1

ML14206A993
Person / Time
Site:	Calvert Cliffs
Issue date:	07/25/2014
From:	Kinsey S Constellation Generation Group
To:	Office of Nuclear Reactor Regulation
Morgan N
References
Download: ML14206A993 (11)

Text

Metals Bench-Top Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant CCNPP-CHLE-010 Revision 1, February 7, 2014 REVISION HISTORY LOG Revision Description 0 Initial Issue UPDATED ALL REFERENCES; added tests due to cleanliness issue; added cleanliness 1 sample acceptance criteria; included verified preliminary test report in the reporting requirements i

Metals Bench-Top Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant CCNPP-CHLE-010 Revision 1, February 7, 2014 Contents 1.0 Introduction ................................................................................................................................................................ 1 2.0 Purpose ......................................................................................................................................................................... 1 3.0 Experimental Plan .................................................................................................................................................... 1 4.0 Experimental Parameters ...................................................................................................................................... 2 4.1 Debris Quantities .................................................................................................................................................. 2 4.2 Concrete ................................................................................................................................................................... 2 4.3 Chemistry Conditions ......................................................................................................................................... 2 4.4 Buffer ......................................................................................................................................................................... 2 4.5 Temperature Conditions ................................................................................................................................... 2 4.6 Solution Sampling ................................................................................................................................................ 4 4.7 Agitation................................................................................................................................................................... 4 4.8 Autoclave Materials ............................................................................................................................................. 4 4.9 Autoclave Volume ................................................................................................................................................ 4 5.0 Test Matrix ................................................................................................................................................................... 4 6.0 Chemistry Analysis ................................................................................................................................................... 5 7.0 Experimental Methods ............................................................................................................................................ 5 7.1 Material Preparation........................................................................................................................................... 5 7.2 Visual Examination .............................................................................................................................................. 6 8.0 Report ............................................................................................................................................................................ 6 8.1 Introduction ........................................................................................................................................................... 6 8.2 Experiment Description .................................................................................................................................... 6 8.3 Experimental Results.......................................................................................................................................... 7 8.4 Summary of Results and Conclusions .......................................................................................................... 7 8.5 References ............................................................................................................................................................... 7 8.6 Appendixes ............................................................................................................................................................. 7 9.0 References .................................................................................................................................................................... 8 List of Tables Table 1: Debris Sample Quantities ................................................................................................................................... 2 Table 2: Concrete Quantity .................................................................................................................................................. 2 Table 3: Chemistry Conditions ........................................................................................................................................... 2 Table 4: Solution Temperature Profile ........................................................................................................................... 3 Table 5: Test Matrix ................................................................................................................................................................ 4 List of Figures Figure 1: Solution & Sump AOR Temperatures........................................................................................................... 3 ii

Metals Bench-Top Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant CCNPP-CHLE-010 Revision 1, February 7, 2014

1.0 INTRODUCTION

Calvert Cliffs Nuclear Power Plant (CCNPP) is implementing a refined chemical effects test program to aid in resolving GSI-191. This refined chemical effects test program includes a number of experiments and tests to investigate different aspects of chemical effects. Included in this program are integrated chemical effects head loss tests intended to simulate temperature, pressure, fluid, and debris conditions in containment after a loss of coolant accident (LOCA).

CCNPP has a variety of potentially reactive materials in containment that must be considered in the refined chemical effects test program. Some of these materials may influence the dissolution or corrosion of other materials such that including them in the integrated tests can be considered non-conservative. Some materials may be sufficiently immune to dissolution and corrosion so that they can be excluded from the integrated tests.

The objective of this bench-top autoclave test plan is to investigate the dissolution and elemental release of materials from CCNPP-specific concrete samples alone and in the presence of potential fibrous debris that may be in containment. The intent is to investigate whether concrete contributes to or inhibits dissolution and corrosion of fibrous debris.

2.0 PURPOSE The purpose of this document is to describe a bench-top autoclave experimental plan for the CCNPP CHLE program. This plan presents the material combinations for the experiments, the thermal and chemistry conditions for each experiment, and the approach to analyzing the results.

3.0 EXPERIMENTAL PLAN The experimental plan consists of a series of corrosion experiments in which CCNPP-specific concrete with and without insulation debris materials are exposed to high temperature fluid simulating the post-LOCA fluid chemistry and temperature in containment for a 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> period.

The identification and concentration of corrosion products and characterization of any precipitates will be compared to determine if there is a significant difference in corrosion and elemental release between the different combinations of materials. Analysis of the results will provide recommendations on materials to include in the integrated tests.

Materials used in the test will be representative of the insulation debris materials submerged in the containment pool or exposed to containment spray and expected to dissolve and contribute to chemical effects. The material quantities will be scaled to approximate the ratio of the test fluid volume to the volume of debris materials immersed in the pool fluid or the surface area of solid materials exposed to pool at CCNPP.

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Metals Bench-Top Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant CCNPP-CHLE-010 Revision 1, February 7, 2014 The fluid chemistry will be similar to the initial post-LOCA pool chemistry expected at CCNPP. A scaled quantity of NaTB buffer will be allowed to dissolve in the test chamber to simulate the dissolution of buffer in the plant.

4.0 EXPERIMENTAL PARAMETERS 4.1 Debris Quantities Table 1: Debris Sample Quantities Insulations Debris Test Quantity Reference Transco Thermal Wrap or NUKON (LDFG) Fiber 1.16 gram/Liter (g/L) 3 Mineral Wool Fiber 0.11 g/L 3 Lead Shield Jacket 0.027 g/L 3 4.2 Concrete Table 2: Concrete Quantity Material Description Test Quantity Reference Concrete 0.45 in2/L 3 4.3 Chemistry Conditions Table 3: Chemistry Conditions Deionized Water with Reference Boron Concentration (H3BO3) 2714 ppm as boron1 3 Lithium Hydroxide 0.75 ppm as lithium 3 4.4 Buffer Include 3.57 grams per liter sodium tetraborate decahydrate (NaTB) buffer (Reference 3). The buffer shall be added after the other materials and not before the fluid temperature has reached 200°F.

4.5 Temperature Conditions The experiments will use the temperature profile discussed below and presented in Table 4 and Figure 1 +/-5°F [Reference 1].

The solution shall be maintained at 200°F for 30 minutes +/-1 minute prior to introduction of the buffer material. After the buffer has been added, begin heating the solution to 280°F. When the 1 The 2714 ppm boron concentration is prior to the introduction of the NaTB buffer.

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Metals Bench-Top Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant CCNPP-CHLE-010 Revision 1, February 7, 2014 solution temperature reaches 280°F +/-2°F establish the test time = 0 seconds and begin the temperature profile presented in Table 4 and Figure 1 +/-5°F.

Table 4: Solution Temperature Profile Time (sec) Temp (°F) Time (sec) Temp (°F) 0 280 28,800 224 400 280 43,200 195 800 279 64,800 191 1,000 279 86,400 187 3,600 274 115,200 181 290 270 250 Temperature (F) 230 210 190 170 150 0 8 16 24 32 40 48 Time (Hrs)

Test Temperature AOR Sump Temperature Figure 1: Solution & Sump AOR Temperatures Page 3 of 8

Metals Bench-Top Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant CCNPP-CHLE-010 Revision 1, February 7, 2014 4.6 Solution Sampling The fluid solution in the autoclave shall be sampled for cleanliness prior to adding the materials listed in Table 1 and Table 2. Samples shall also be taken just prior to adding the buffer, at t=0 seconds, which is defined as when the solution reaches 280°F +/-2°F, and then at the 2, 6, 8, 24, 32, and 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> time points (a total of nine [9] samples). The samples shall be stored in containers fabricated from non-reactive and corrosion resistant materials.

4.7 Agitation The autoclave shall be agitated continuously throughout the experiment to facilitate fluid flow across the contained materials. The means of agitation shall not physically contact the debris or reactive materials inside the autoclave.

4.8 Autoclave Materials Wetted materials of the autoclave should be type 316 stainless steel or other very corrosion resistant material. No silicate glass products may be used.

4.9 Autoclave Volume The autoclave shall have a minimum volume of five (5) gallons.

5.0 TEST MATRIX The experiment will be performed in accordance with the test matrix presented in Table 5.

Table 5: Test Matrix Test Table 1 Table 2 Table 3 ¶4.4 CCNPP-301 X X X X CCNPP-302 X X X X CCNPP-303 X X X CCNPP-304 X X X CCNPP-305 X X X CCNPP-306 X X X Page 4 of 8

Metals Bench-Top Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant CCNPP-CHLE-010 Revision 1, February 7, 2014 6.0 CHEMISTRY ANALYSIS Mass spectrometry of the fluid used in the experiment shall be performed on the samples collected during the experiment. The concentrations of the following elemental species shall be reported:

Sample Type Cleanliness Chemistry Aluminum Aluminum Calcium Calcium Copper Magnesium Lead Silicon Magnesium Zinc Silicon Zinc The cleanliness samples shall be investigated for Al, Ca, Cu, Pb, Mg, and Zn with an acceptance criterion of 500 ppb for each. This is a hold point for the tests CCNPP-301 to CCNPP-306:

acceptable results of the analyses of the cleanliness sample determine if the autoclave is clean enough to proceed.

For tests CCNPP-301 to CCNPP-306, cleanliness samples shall be investigated for silicon with an acceptance criterion of 25 ppm Si. This acceptance requirement is NOT a hold criterion; rather, the test will be declared invalid after receipt of the silicon data if the silicon acceptance is not met.

7.0 EXPERIMENTAL METHODS Professional laboratory and safety practices shall be followed. Specific laboratory procedures used to implement the experiment shall be made available to Calvert Cliffs for review and comment.

The following specific experimental processes shall also be followed.

7.1 Material Preparation 7.1.1 Debris Materials Fibrous debris shall be prepared in accordance with the NEI Fiber Debris Preparation Protocol

[Reference 2], with the exception of steps 6.5, 6.6 and 6.7, dried, and weighed to the quantity specified. The fiber samples will be placed in stainless steel mesh containers and secured to remain submerged in the experimental fluid and protected from the agitation mechanism.

Photographs of the debris materials before preparation, after weighing or measuring, and contained in the mesh container shall be provided.

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Metals Bench-Top Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant CCNPP-CHLE-010 Revision 1, February 7, 2014 7.1.2 Concrete Concrete coupons will be cut from a solid piece of concrete provided by CCNPP. The coupons shall not include particles which can pass through a 16 mesh sieve. The coupons will be placed in stainless steel 18 mesh containers and secured to remain submerged in the experimental fluid and protected from the agitation mechanism.

Photographs of the concrete before and after preparation shall be provided.

7.2 Visual Examination A thorough visual examination of the autoclave, fibrous material containers, and reactive material coupons shall be performed. Any indications of precipitation shall be documented.

8.0 REPORT A verified preliminary report is requested. This report shall include data from testing and a test lab interpretation of the results.

A formal report shall be provided documenting the performance of the experiment and the results of the experiment. The following topics shall be included in the report.

8.1 Introduction A brief introduction to the report shall be presented 8.2 Experiment Description A detailed description of the experiment shall be presented including at least the following sections.

8.2.1 Facility A comprehensive description of the experimental facility shall be presented with photographs. This shall include:

1) Autoclave(s)

a. Volume capacity

b. Wetted materials

c. Heating method

d. Agitation method

2) Temperature controls

a. Heat up rate

b. Cool down rate

3) Instrumentation and analysis equipment

a. Temperature

b. pH

c. Mass Spectrometry Page 6 of 8

Metals Bench-Top Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant CCNPP-CHLE-010 Revision 1, February 7, 2014 8.2.2 Experiment Input Parameters A detailed description of the input parameters for each experiment shall be presented.

8.2.3 Material Preparation The methods and processes for preparing fluid solutions and corrosion samples shall be described and the results presented with photographs.

8.2.4 Autoclave Setup and Control The procedures used to setup the autoclave, control temperature conditions, take and store samples, and perform the chemistry analyses shall be described in detail.

8.3 Experimental Results The results of each test shall be presented in individual sections. These sections shall include at least the following information.

1) Experimental parameters used

2) Actual temperature profile achieved

3) Results of chemical analysis of samples

4) Deviations and Nonconformance Reports

5) Results of visual examination

6) Photographs of notable observations as appropriate 8.4 Summary of Results and Conclusions A summary of results comparing the individual tests if the experiment will be presented and any conclusion drawn presented.

8.5 References Unique references used in the preparation of the report shall be presented. This test plan shall be included as a reference.

8.6 Appendixes Appendixes shall be provided including as a minimum the following:

1) Test Logs

2) Calibration Certificates/Records

3) Standards Certificates

4) Photographs Page 7 of 8

Metals Bench-Top Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant CCNPP-CHLE-010 Revision 1, February 7, 2014

9.0 REFERENCES

1. Design Calculation CA06774, Rev. 0002, Containment Response to LOCA and MSLB for Calvert Cliffs Units 1 and 2.

2. ZOI Fibrous Debris Preparation: Processing, Storage and Handling, Revision 2, Nuclear Energy Institute, November, 2011.

3. CCNPP-CHLE-100, Determination of Material Quantities for Chemical Effects Autoclave Testing, Revision 4.

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