ML14344A546

Attachment 1 to NOC-AE-14003190 - Alion REP-STP-8998-13, Strainer Test Plan in Support of STP Pilot Risk-Informed GSI-191 Pilot Licensing Application Executive Summary

ML14344A546
Person / Time
Site:	South Texas
Issue date:	10/30/2014
From:	Kee E, LaBrier D, Letellier B C ALION Science & Technology Corp, South Texas, Univ of New Mexico
To:	Office of Nuclear Reactor Regulation
Shared Package
ML14344A566	List: ML14344A545 ML14344A546 NOC-AE-14003190, Attachment 2 to NOC-AE-14003190 - ALION-REP-STP-8998-14, Strainer Test Plan in Support of STP Pilot Risk-Informed GSI-191 Pilot Licensing Application
References
GSI-191, NOC-AE-14003190, STI 33969356, TAC MF2400, TAC MF2401 ALION-REP-STP-8998-13
Download: ML14344A546 (10)

Text

NOC-AE-14003190 Attachment 1 Strainer Test Plan in Support of STP Pilot Risk-Informed GSI-191 Pilot Licensing Application Executive Summary South Texas Project Risk-Informed GSI-1 91 Evaluation Strainer Test Plan in Support of STP Pilot Risk-Informed GSI- 191 Pilot Licensing Application Executive Summary Document:

ALION-REP-STP-8998-13 Revision:

0 Date: October 28, 2014 Prepared by: Bruce C. Letellier, Alion Science and Technology Daniel LaBrier, University of New Mexico Ernie Kee, South Texas Project Reviewed by: Wes Schultz, South Texas Project Approved by: Steve Blossom, South Texas Project p A L I 0 N TECHNICAL DOCUMENT COVER PAGE WCIEHCE AND TECHNOLOGY Document No: ALION-REP-STP-8998-13 I Revision:

0 1 Page I of 8 Document Title: Strainer Test Plan in Support of STP Pilot Risk-Informed GSI- 191 Pilot Licensing Application:

Executive Summary Project No: STP-8998 Project Name: STP Risk Informed GSI- 191 Support Client: STP Nuclear Operating Company Document Purpose/Summary:

In support of Risk-Informed-Resolution (RIR) arguments developed for closure of Generic Safety Issue-191 (GSI- 19 I), South Texas Project (STP) is constructing a horizontal flume facility to conduct a limited-scope investigation of strainer performance at the University of New Mexico (UNM) Thermal Hydraulics Laboratory.

Below is an executive summary of the Flume Integral Effects and Separate effects Testing and Analysis (FIESTA) facility.This document is not considered safety related. However, it has been prepared, reviewed, and approved.

Review was completed by the client.Design Verification Method: X Design Review Alternative Calculation

_ Qualification Testing Professional Engineer (if required)

Approval:

NA Date: NA Prepared By: Bruce Letellier 7 C. 4 10/29/2014 Printed/Typed Name Signature Date Ernie Kee -STPNOC 4 10/29/2014 Reviewed By: -.Printed/Typed Name Signature Date Megan A Stachowiak

_ I aoi q Approved By: 4 6 C/o[-1a Printed/Typed Name Signature Date Form 3.3.1 Revision 2 Effective Date: 2/28/07 A L ION SCIENCE AND TEC4H~OLOGY REVISION HISTORY LOG Page 2 of 8 Document Number: ALION-REP-STP-8998-13 Revision:

0 Document Title: Strainer Test Plan in SUDDort of STP Pilot Risk-Informed GSI- 191 Pilot Licensing Application:

Executive Summary REVISION DATE Description 0 See Cover Page Initial Release Form 6.1.3 Revision 3 Effective Date: 9/12/14 aStrainer Test Plan in Support of STP Pilot Risk-Informed GSI- 191 Pilot Licensing Application A L I 0 N Document No: ALION-REP-STP-8998-13 Rev: 0 Page 3 of 8 SCIENCE AIJO TECHNOLOGY Table of Contents I Objectives of Strainer Module Testing for South Texas Project ...............................................................

4 2 Test Description

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5 3 FIESTA Facility ..............................................................................................................................................................

6 4 R eferences

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8 QStrainer Test Plan in Support of STP Pilot Risk-Informed GSI- 191 Pilot Licensing Application A L I 0 N Document No: ALION-REP-STP-8998-13 Rev: 0 Page 4 of 8 SCIENCE ANO TECENOLOGY I I Objectives of Strainer Module Testing for South Texas Project In support of Risk-Informed-Resolution (RIR) arguments developed for closure of Generic Safety Issue-191 (GSI-191), South Texas Project (STP) is constructing a horizontal flume facility to conduct a limited-scope investigation of strainer performance at the University of New Mexico (UNM) Thermal Hydraulics Laboratory.

The Flume Integral Effects and Separate effects Testing and Analysis (FIESTA) facility is described below.Test conditions will emphasize total transport of specified debris (including fiber, particulates and chemical products) to a full-scale strainer module with corresponding time-dependent measurement of flow velocity, head loss, water temperature and volume, chemical concentration, and debris mass. These tests are intended to emulate the procedures and strainer configuration used for deterministic STP strainer performance testing [I] while expanding the data base available for calibration and validation of both the L-star (L*) additive, chemical head-loss response envelope [2] and the VISTA head-loss correlation applied to a functional strainer module [3].The planned flume tests will generate data in prototypical performance ranges for the STP ECCS strainer and help quantify the margin of uncertainty between actual behavior and semi-analytic approximations of head loss induced by chemical and non-chemical debris. Specific test objectives include: I) Collecting strainer performance data across the full range of known head-loss challenges including thin-bed conditions with high particulate/chemical loads and design-basis conditions with maximum fiber and maximum particulate/chemical loads;2) Maximizing the amount of information collected during the formation of each bed because intermediate loads represent unique accident conditions in the spectrum of possible Loss of Coolant Accidents (LOCAs);3) Emphasizing thin-bed conditions that are most likely to occur and most likely to influence risk quantification if adverse responses exceed thresholds of concern;4) Increasing data resolution in regions of low chemical loading (mass per unit area) where existing measurements are sparse;5) Complementing existing strainer performance tests by filling data gaps rather than generating replicate information;

6) Employing familiar test procedures for debris preparation and transport, and familiar chemical product surrogates.

2 Test Description Traditional strainer performance testing emphasizes debris combinations that are known to cause large head-losses including: (A) thin, uniform fiber beds with high particulate and high chemical loads; and (B) thick, uniform fiber beds with high particulate and high chemical loads. For STP, Condition A represents Medium Break LOCAs (MBLOCA) with high debris transport factors, and small-to-medium-sized Large Break LOCAs (LBLOCA) with lower debris transport factors.Condition B represents a design basis accident (DBA) with LBLOCA debris inventory and high transport factors. Previous strainer module testing emphasized Condition B [2], so the DBA strainer response is better understood for LBLOCAs than the more likely cases represented by Condition A.Debris combinations selected for these flume tests emphasize most likely conditions (risk-dominant) while recognizing uncertainties in the chosen conditions.

Prior strainer module tests performed at Alden Research Laboratory (ARL) emphasized extreme debris loads [I]. So in combination with an understanding of how infrequently extreme conditions occur, ARL data can help quantify uncertainties with respect to results obtained from current FIESTA studies. The FIESTA test plan includes an option to replicate a DBA loading condition if existing data are judged to be insufficient.

Table I provides generic descriptions and a brief rationale for each of the planned tests. All material quantities will be scaled from the plant conditions to the test-module surface area.Clean-strainer data will form an aggregate basis for correlating clean-strainer head-loss as a function of temperature and velocity when stock chemical solutions are present. During a typical test, nonchemical debris will be introduced first in a series of small batches of constant particle-to-fiber ratio until maximum specified debris loads are achieved.

Surrogate chemical precipitate will then be added to the pre-established debris bed. Chemical products will also be introduced in small batches to improve data resolution in the low-concentration range and near chemical loads of special interest.

Total chemical inventory added to each test will be calculated using WCAP- 16530 corrosion rates.Table 1. High-level test description Test Series Non-Chemical Conditions Chemical Conditions FTA-000 Facility Shakedown:

Surrogate preparation and introduction procedures

-Temperature/flow control-Debris intro/transport procedures

-Cleaning and transport calibration

-Diagnostic function and acquisition 0 I O: Clean strainer, no solid debris Pure water with no chemicals 120: Clean strainer, no solid debris Baseline chemicals 130: Clean strainer, no solid debris Baseline chemicals

+ WCAP surrogate

[4]140: Batch additions of solid debris Optional continuation of FTA- 130 I / 16th -in. total equivalent fiber, all failed WCAP surrogate with initial loading rates informed FTA-200 unqualified coatings + SBLOCA damaged by UNM corrosion data.qualified coatings + latent debris Addition up to reduced 30-day inventory.

Addition up to full WCAP 30-day inventory.

o Strainer Test Plan in Support of STP Pilot Risk-Informed GSI- 191 Pilot Licensing Application A L I 0 N Document No: ALION-REP-STP-8998-13 Rev: 0 Page 6 of 8 MCIINCE AND TtCHUOLOGI Test Series Non-Chemical Conditions Chemical Conditions 1/4 t-in. total equivalent fiber, failed WCAP surrogate with initial loading rates informed FTA-300 unqualified coatings + MBLOCA by UNM corrosion data.damaged qualified coatings + latent Addition up to reduced 30-day inventory.

debris Addition up to WCAP 30-day inventory.

DBA condition to confirm ARL data WCAP surrogate with initial loading rates informed FTA-400 using new maximum loadings by UNM corrosion data.OR, replicate one FTA test for variability Addition up to reduced 30-day inventory.

I OR, improve thin-bed characterization Addition up to WCAP 30-day inventory.

Notes: a. Clean-strainer tests may be performed in a single continuous run during shakedown.

b. Option FTA-140 would add solid debris at the end of FTA- 130 (reverse-order loading)3 FIESTA Facility The FIESTA experimental facility is designed to simulate fiber transport during the recirculation phase. Test procedures will emphasize total transport with no credit for settling.

The FIESTA facility will house the STP prototypical strainer module at one end of the flume and will be instrumented to collect time-dependent pressure-drop data. The FIESTA facility (Figure I) will be a closed-loop insulated flume that is 32 ft (L) X 4 ft (W) X 6 ft (H) and will be capable of achieving temperatures as high as 85 C, with an expected operating temperature near 55 C.a IN Figure I. Notional schematic of the UNM Flume Integral Effects and Separate Analysis (FIESTA) Facility Effects Testing and Elevated solution temperatures can be achieved by use of an inline heat exchanger system.Additional small-scale heat exchangers will be installed to allow the facility to vary the temperature of the solution during a test (e.g. a temperature sweep). A customized polycarbonate channel will be installed interior to the open channel of the flume to develop appropriate flow conditions and encourage debris transport, similar to previous tests performed at Alden Research Laboratory

[I]. Incorporation of a STP strainer module (Figure 2) allows for 4 Strainer Test Plan in Support of STP Pilot Risk-Informed GSI- 191 Pilot Licensing Application A L I 0 N Document No: ALION-REP-STP-8998-13 Rev: 0 Page 7 of 8$ AWO ADTtC OLOGY characterization of prototypical head loss under a variety of specified debris loads and velocity/temperature test conditions.

Plant operating velocities will be established by controlling total volumetric flow across the strainer face area.Figure 2. Series of Strainer Modules (left) and Single Strainer Module (right) for STP Solid debris and chemical surrogates will be introduced at the far left side of Figure I via an isolation tank or baffle that can feed into the primary channel flow. A chemical batch addition plan will be constructed with an actual time history and a total loading goal in mind, with consideration given to condensing the timeline with a faster rate (or more batches) as needed.Sweep tests (gradual variation of fluid velocity and temperature) will be performed to collect data over a wider range of operating conditions for a given debris load. Bed integrity will be assured during sweeps by defining trends that further compress the bed with respect to nominal test conditions.

Table 2 lists the primary diagnostics that are needed to conduct FIESTA flume tests and describes their purpose and sampling frequency.

Table 2. Primary Supporting Diagnostics and Data Collection Diagnostic Purpose Flume Sampling Frequency Mode Volumetric flow rate Face velocity on the test 0. 1 to 0.02 Hz (every 10 to 50s) Online module Differential Pressure Hydraulic loss through the matched with flow samples Online Array debris bed. Clean strainer response along the module.Static pool pressure Fluid density in combination matched with flow samples Online with level Liquid Temperature Fluid properties, pH correction matched with flow samples Online Room Temperature Differential pressure matched with flow samples Online correction Liquid Level Fluid density, chemical conc, 4 times per hour or as specified Online or water make up. in test plan Spot Read Total pipe volume Chemical conc. NA Once Diagnostic Purpose Flume Sampling Frequency Mode.pH Chemical debris preparation Once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> after first Bench Reading and flume test conditions chemical add or as specified in test plan Viscosity Fluid properties Once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> after first Bench Reading (option) chemical add, or as specified in test plan ICP Flume concentration for mass Once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> after first Grab Sample balance chemical add, or as specified in test plan Particle sizing Characterize surrogate NA As needed chemical product Light table Verify debris preparation NA Each debris batch Prior to each test, the FIESTA facility must be cleaned, filled and prepared with stock chemical fluid, and heated to a specified temperature.

Procedures will be developed for (a) cleaning the flume system, and (b) preparing the stock chemical environment.

The documented WCAP preparation procedure will be followed in tests where the WCAP chemical surrogate is used [4].All surrogate chemicals will be formulated external to the flume, verified for acceptability, and then introduced according to a detailed procedure that will be defined for each test.4 References I) South Texas Project Test Report for ECCS Strainer Testing, AREVA NP Document #66-9088089-000.

August 2008.2) Leavitt, J.J. and Kee, E., "Quantification of Chemical Head Loss Epistemic Uncertainty; Basis for Incremental Chemical Head Loss Correlation," ALION-REP-STP-8998-08 Rev. I, July 2014.3) Letellier, B.C., Macali, M.E., Kee, E.J., "Viscous Inertial Shear-Transition-Adaptive (VISTA)Porous Media Head-Loss Formulation for Assessment of South Texas Project Licensing Amendment Request," ALION-REPSTP-8998-I I, Rev. 0. July 2014.4) WCAP- I 6530-NP-A, "Evaluation of Post-Accident Chemical Effects in Containment Sump Fluids to Support GSI- 19 1." March 2008.