ML14206B001

Long-Term Chemical Effects Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant. CCNP-CHLE-011, Revision 2

ML14206B001
Person / Time
Site:	Calvert Cliffs
Issue date:	02/14/2014
From:	Sellers C - No Known Affiliation
To:	Office of Nuclear Reactor Regulation
Morgan N
References
CCNP-CHLE-011, Rev 2
Download: ML14206B001 (12)

Text

Long-Term Chemical Effects Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant CCNPP-CHLE-011 Revision 2, February 14, 2014 REVISION HISTORY LOG Revision Description 0 Original Issue Revise Material Quantities and Temperature Profile; updated sampling and filtration 1 sampling schedule; updated test initiation temperature schedule; updated filtration requirements UPDATED References, modified temperature profile to reflect alternate approach to 2 final day temperature reductions.

i

Long-Term Chemical Effects Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant CCNPP-CHLE-011 Revision 2, February 14, 2014 Contents 1.0 Introduction ................................................................................................................................................................ 1 2.0 Purpose ......................................................................................................................................................................... 1 3.0 Overall experimental Plan ..................................................................................................................................... 1 4.0 Experimental Parameters ...................................................................................................................................... 2 4.1 Debris Quantities .................................................................................................................................................. 2 4.2 Reactive Material.................................................................................................................................................. 2 4.3 Chemistry Conditions ......................................................................................................................................... 2 4.4 Buffer ......................................................................................................................................................................... 3 4.5 Temperature Conditions ................................................................................................................................... 3 4.6 Solution Sampling ................................................................................................................................................ 4 4.7 Agitation................................................................................................................................................................... 4 4.8 Autoclave Materials ............................................................................................................................................. 5 4.9 Autoclave Volume ................................................................................................................................................ 5 5.0 Test Matrix ................................................................................................................................................................... 5 6.0 Chemistry Analysis ................................................................................................................................................... 5 7.0 Vacuum Filtration ..................................................................................................................................................... 5 8.0 Experimental Methods ............................................................................................................................................ 6 8.1 Debris Preparation .............................................................................................................................................. 6 8.2 Visual Examination .............................................................................................................................................. 7 9.0 Report ............................................................................................................................................................................ 7 9.1 Introduction ........................................................................................................................................................... 7 9.2 Experiment Description .................................................................................................................................... 7 9.3 Experimental Results.......................................................................................................................................... 8 9.4 Summary of Results and Conclusions .......................................................................................................... 8 9.5 References ............................................................................................................................................................... 8 9.6 Appendixes ............................................................................................................................................................. 8 10.0 CCNPP Results Acceptance.................................................................................................................................... 9 11.0 References .................................................................................................................................................................... 9 List of Tables Table 1: Fibrous Debris Sample Quantities .................................................................................................................. 2 Table 2: Reactive Material Quantities ............................................................................................................................. 2 Table 3: Chemistry Conditions ........................................................................................................................................... 2 Table 4: Solution Temperature Profile ........................................................................................................................... 3 List of Figures Figure 1: Solution & Sump AOR Temperatures........................................................................................................... 4 ii

Long-Term Chemical Effects Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant CCNPP-CHLE-011 Revision 2, February 14, 2014

1.0 INTRODUCTION

Calvert Cliffs Nuclear Power Plant (CCNPP) is implementing a risk-informed approach to resolving GSI-191 that includes the performance of a number of chemical effects experiments. These experiments are intended to simulate temperature, pressure, fluid, and debris conditions in containment after a loss of coolant accident (LOCA).

Temperature conditions inside containment during a large break LOCA peak at approximately 280°F and remain elevated above 190°F for over 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br />. The fluid temperature then slowly drops to approximately 140°F over the next 30 days. Elemental release estimates using the WCAP-16530 methodology indicate that the release rates of aluminum, silicon, and calcium approach zero after 100 to 150 hours0.00174 days <br />0.0417 hours <br />2.480159e-4 weeks <br />5.7075e-5 months <br /> when the temperature of the fluid reaches approximately 155°F.

The objective of this autoclave test is to investigate the long-term release rates and precipitate production over a ten (10) day period to determine whether integrated corrosion head loss tests can be run for less than thirty (30) days and provide representative long-term chemical effects head loss results. The results of this test will influence the decision on how long the integrated tests within the CCNPP Chemical Effects Head Loss Experiment (CHLE) program need to be run.

2.0 PURPOSE The purpose of this document is to describe the autoclave experiment planned for the CCNPP CHLE program. This plan presents the sequence for performing the experiment and the conditions for each experiment.

3.0 OVERALL EXPERIMENTAL PLAN The overall concept for the experiment is four corrosion experiments using a temperature profile similar to the design basis LOCA at CCNPP with fluid simulating the post-LOCA fluid solution in containment and corrodible materials expected in containment in the fluid. The identification and concentration of corrosion products and characterization of any precipitates will be analyzed to determine whether tests with durations less than thirty (30) days can be considered representative of long-term conditions.

Materials used in the test will be representative of the materials submerged in the containment pool or exposed to containment spray and expected to dissolve and contribute to chemical effects.

These include destroyed insulation, shielding, concrete, latent debris and other miscellaneous materials in containment. The material quantities will be scaled to approximate the ratio of the test Page 1 of 9

Long-Term Chemical Effects Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant CCNPP-CHLE-011 Revision 2, February 14, 2014 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.

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: Fibrous Debris Sample Quantities Insulations Debris Test Quantity Reference Transco Thermal Wrap or NUKON (LDFG) Fiber 1.16 gram/Liter (g/L) 1 Mineral Wool Fiber 0.11 g/L 1 Lead Shield Jacket 0.027 g/L 1 4.2 Reactive Material Table 2: Reactive Material Quantities Material Description Test Quantity Reference Metallic Aluminum 0.03 in2/L 1 Galvanized Steel 8.6 in2/L 1 ASTM B-152 Copper 11.0 in2/L 1 ASTM B-466 Cupro-Nickel 0.13 in2/L 1 Concrete 0.45 in2/L 1 Marinite Board 0.30 in2/L 1 Lead 0.03 in2/L 1 Zinc 14.04 in2/L 1 4.3 Chemistry Conditions Table 3: Chemistry Conditions Deionized Water with Reference Boron Concentration (H3BO3) 2714 ppm as boron1 1 Lithium Hydroxide 0.75 ppm as lithium 1 1 The 2714 ppm boron concentration is prior to the introduction of the NaTB buffer.

Page 2 of 9

Long-Term Chemical Effects Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant CCNPP-CHLE-011 Revision 2, February 14, 2014 4.4 Buffer Include 3.57 grams per liter sodium tetraborate decahydrate (NaTB) buffer (Reference 1). The buffer shall be added after the other materials and not before the fluid temperature has been maintained at 200°F as described in Section 4.5.

4.5 Temperature Conditions The four experiments will simulate the temperature profile presented in Table 4 and Figure 1 +/-5°F

[Ref. 2].

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 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 Profile2 Time (hr) CHLE-011 Test Temperature (°F) 0 280 12 190 24 175 36 170 72 165 96 162 120 158 144 155 168 152 192 151 216 150 240 150 2 The solution temperature shall change linearly with respect to time between the tabulated time points.

Page 3 of 9

Long-Term Chemical Effects Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant CCNPP-CHLE-011 Revision 2, February 14, 2014 280 270 260 250 240 230 220 Temp (F) 210 200 190 180 170 160 150 140 130 0 24 48 72 96 120 144 168 192 216 240 Time (hr)

CHLE-011 Test Temperature AOR Sump Temperature Figure 1: Solution & Sump AOR Temperatures 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 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 8, 24, 72, 96, 120, 168, 192, 220, 226, 233, and 240 hour0.00278 days <br />0.0667 hours <br />3.968254e-4 weeks <br />9.132e-5 months <br /> time points (a total of thirteen [13] chemistry samples and one cleanliness sample for a total of fourteen [14] chemistry sample extractions). 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.

Page 4 of 9

Long-Term Chemical Effects Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant CCNPP-CHLE-011 Revision 2, February 14, 2014 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 by completing four (4) identical autoclave tests numbered CCNPP-501 through CCNPP-504.

6.0 CHEMISTRY ANALYSIS Mass spectrometry of the fluid used in the experiment shall be performed:

1. On the deionized water prior to addition of the boric acid at the beginning of each experiment, and

2. On the fluid solution samples collected during each experiment.

The concentrations of the following elemental species shall be reported:

1. Aluminum 5. Magnesium

2. Calcium 6. Silicon

3. Copper 7. Sodium

4. Lead 8. Zinc The cleanliness samples shall be investigated for Al, Ca, Cu, Mg, Pb, and Zn with an acceptance criterion of 500 ppb for each. This is a HOLD POINT for the tests: acceptable results of the analyses of the cleanliness sample determine if the autoclave is clean enough to proceed.

The cleanliness samples shall be investigated for silicon with an acceptance criterion of 25 ppm Si.

This acceptance requirement is NOT a HOLD POINT criterion; rather, the test will be declared invalid after receipt of the silicon data if the silicon acceptance is not met.

7.0 VACUUM FILTRATION Vacuum filtration shall be performed on three (3) samples taken at the 120, 168, 220, 226, and 233 hour0.0027 days <br />0.0647 hours <br />3.852513e-4 weeks <br />8.86565e-5 months <br /> time points and twelve (12) samples taken at the 240 hour0.00278 days <br />0.0667 hours <br />3.968254e-4 weeks <br />9.132e-5 months <br /> time point (a total of twenty seven Page 5 of 9

Long-Term Chemical Effects Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant CCNPP-CHLE-011 Revision 2, February 14, 2014

[27] samples). Samples taken at temperatures 150°F will be maintained at 150°F until the vacuum filtration is complete EXCEPT for nine (9) of the twelve (12) samples taken at the 240 hour0.00278 days <br />0.0667 hours <br />3.968254e-4 weeks <br />9.132e-5 months <br /> time point.

The nine (9) samples taken at the 240 hour0.00278 days <br />0.0667 hours <br />3.968254e-4 weeks <br />9.132e-5 months <br /> time point will be divided into three (3) groups and one (1) group held at 130°F, one (1) group held at 110°F, and one (1) group held at 90°F for four (4) hours prior to performing the vacuum filtration.

Dry and weigh each filter; record the net weight gain. Perform a chemical analysis on at least one filter for each time and for at least one filter for each of the 240 hour0.00278 days <br />0.0667 hours <br />3.968254e-4 weeks <br />9.132e-5 months <br /> temperature groups using mass spectrometry. Perform other examinations as appropriate.

8.0 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.

8.1 Debris Preparation 8.1.1 Fibrous Debris Fibrous debris shall be prepared in accordance with Reference 1, 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 fiber before preparation, after weighing, and contained in the mesh container shall be provided.

8.1.2 Reactive Materials Coupons of metal reactive materials shall be prepared from 20 gauge or thinner flat plates. The coupons shall be suspended in the autoclave fluid so that both faces are fully exposed to the fluid.

Concrete coupons shall be cut from the concrete provided by Calvert Cliffs. Marinite coupons will be cut from a solid piece of Marinite board. The concrete and Marinite coupons shall not include particles which can pass through a 16 mesh sieve. The concrete and Marinite 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 reactive materials before and after preparation shall be provided.

Page 6 of 9

Long-Term Chemical Effects Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant CCNPP-CHLE-011 Revision 2, February 14, 2014 8.2 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.

9.0 REPORT 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.

9.1 Introduction A brief introduction to the report shall be presented 9.2 Experiment Description A detailed description of the experiment shall be presented including at least the following sections.

9.2.1 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 9.2.2 Experiment Input Parameters A detailed description of the input parameters for each experiment shall be presented.

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

Page 7 of 9

Long-Term Chemical Effects Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant CCNPP-CHLE-011 Revision 2, February 14, 2014 9.2.4 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.

9.3 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 9.4 Summary of Results and Conclusions A summary of results comparing the individual tests if the experiment will be presented and any conclusion drawn presented.

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

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

1) Test Logs

2) Calibration Certificates/Records

3) Standards Certificates Page 8 of 9

Long-Term Chemical Effects Autoclave Experiment Test Plan for Calvert Cliffs Nuclear Power Plant CCNPP-CHLE-011 Revision 2, February 14, 2014 10.0 CCNPP RESULTS ACCEPTANCE This section captures how Calvert Cliffs will use the results and is not intended for use by the testing provider to assess the quality of the results.

Calvert Cliffs desires to justify a less than thirty (30) day test duration as representative for long-term chemical effects in integrated chemical effects testing including chemical effects head loss.

The following acceptance criteria will be used to establish the appropriate test duration:

1) Less than 10% change in aluminum, copper, lead and zinc concentrations between samples for concentration greater than 1 ppm.

2) Less than 10% increase in filtration time between samples.

Such results would clearly indicate the end of chemical release from the most reactive metals and the end of formation of precipitates affecting head loss.

11.0 REFERENCES

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

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

3. ZOI Fibrous Debris Preparation: Processing, Storage and Handling, Revision 1, Nuclear Energy Institute, November, 2011.

Page 9 of 9