ML20096D801

Nonproprietary Final Rept of Arkansas Power & Light Inadequate Core Cooling Monitoring Sys Confirmatory Test Program

ML20096D801
Person / Time
Site:	Arkansas Nuclear
Issue date:	08/31/1984
From:	Garber F, Hunter B, Rothwell R TECHNOLOGY FOR ENERGY CORP.
To:
Shared Package
ML19269A500	List: ML20096D795 ML20096D801
References
R-84-011-NP, R-84-11-NP, NUDOCS 8409060304
Download: ML20096D801 (11)

Text

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y . Report No. R-84-011-NP

<+ ' FINAL REPORT OF THE AP&L ICC MONITORING SYSTEM

.. ' CONFIRMATORY PROGRAM

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AP&L Project Team

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yn ~ ' . Ron Oakley - Project Supervisor Steve Paquette - Project Engineer

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.: 4> - TEC Project Team Wayne Garber, Project Manager

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.l} 4. .; /;/s t Technology for Energy Corporation Q, , One Energy Center, Pellissippi Parkway

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-August 1984

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, /M F. W. Garbier /- R. A. Hedrick

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E .T-TABLE OF CONTENTS

-Section- Page

1. INTRODUCTION 1-1 e

2.- A*R/ WATER TEST _ SERIES 2-1

- .2.1 Overall'0bjectives of the Air / Water Test Series .2-1 2.2 Air / Water Experimental Configuration and Testing Matrix 2.3 Air / Water Results and Conclusions PAGES -

'2.3.1 Results and Conclusions for .

Manometer Port Testing DELETED 2.3.2 Results and Conclusions for AW2100 2.3.3 Results and Conclusions for AW2200 2.3.4 Results and Conclusions for AW2300 2.3.5 Results and Conclusions for AW2400 __ __

3. UPPER HEAD TEST SERIES 3-1 3.1 Overall Objectives of the Upper Head Test Series 3-1

~3.2 Upper Head Experimental Configuration and Testing Matrix 3.3 Upper Head Results and Conclusions 3.3.1 Basic Response Patterns During Blowdown 3.3.2 Differential Pressure Transducer pg'GES Comparisons during Blowdown DELETED 3.3.3 Basic Response Patterns During Reflood 3.3.4 Differential Pressure Transducer -,

Comparisons During Reflood ---

4-1

4. IN-CORE TEST SERIES 4.1 - Ov erall Objectivs 'f the_In-Core Test Series __ 4-1:.__

4.2 'In-Core Experimental Configuration and Testing Matrix 4.3 In-Core Results and Conclusions 4.3.1 FPS Sheath Thermocouple Comparisons PAGES During' Blowdown 4.3.2 Differential Pressure Transducer Comparisons DELETED During Blowdown 4.3.3 FPS Sheath Thermocouple Comparisons During Reflood 4.3.4 Differential Pressure Transducers Comparisons __ -___

During.Reflood 5-1

5. OVERALL. CONCLUSIONS iii

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l SECTION 1 l INTRODUCTION I

i Arkansas' Power and Light (AP&L) Company has contracted Technalogy for Energy Corporation (TEC) to supply an inadequate core cooling (ICC) system for Arkansas Nuclear One. AP&L and TEC, therefore, designed and conducted an extensive experimental program on the Radcal Inventory Meter (RIM) to verify

. IC capability and to provide licensing support and design data for the

. system hardware. The test program was conducted at facilities leased from the Oak Ridge National Laboratory (ORNL) utilizing two atmospheric air / water test facilities and the pressurized water Forced Convection Test Facility (FCTF). The air / water facilities were used to provide manometer tube design data and basic sensor response parameters. The FCTF is a typical reactor simulation facility that has been used in several Nuclear Regulatory Commission Programs. It has both blowdown and reflood capability with sufficient control and instrumentation systems to perform the tests required to_ simulate a reactor under small break, loss-of-coolant conditions.

The overall objectives of the test program were:

• To verify that the proposed manometer tube design permits unambiguous coolant inventory determinations (above-core),

• To confirm that the RIM probes will detect ICC conditions (above-core and in-core), and #

• To identify the boundary conditions for unambiguous ICC indications (above-core and in-core).

i 1-1

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C Section 2 AIR / WATER TEST SERIES

'2.1 OVERALL 0BJECTIVES OF THE AIR / WATER TEST SERIES j The overall objectives of the air / water test series were:

o To provide basic des'ign data on the-manometer tube stilling column and RIM assembly's performance, o To demonstrate that the. final prototype manometer tubes and .

probes can make level measurements in a variety of air / water mixtures and flows, o To obtain basic performance data, response time, and fill and drain rates of the manometer tube-probe assemblies, and e To determine the boundary conditions of flow and void fraction under which the probe assembly can provide unambiguous data to a reactor operator.

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Section 3

. UPPER HEAD TEST SERIES 3.1 OVERALL OBJECTIVES 0F THE UPPER HEAD TEST SERIES Th'e overall objectives of the Upper Head Test Series were

o To demonstrate that the prototype inventory meters can supply measurements to provide effective'ICC monitoring of the upper

. . head and upper plenum of the reactor, o To provide data to determine the boundary conditions on unambiguous inventory meter ICC monitoring performance--

depressurization rates.(break size), flow rates (pumps off sensitivity), and refill repressurization, o: To confirm that the absolute temperature measurement provides a good indication of coolant temperature above the core in an ICC event, and o To provide ' data to select the optimum sensor types and arrange-ments in the inventory meter probes for ANO-1 and ANO-2.

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t*l .s Section 4 IN-CORE TEST SERIES e

4.1 OVERALL OBJECTIVES OF THE IN-CORE TEST SERIES The 'oterall objectives of the in-core test series were:

e e To demonstrate' that the prototype RIM sensors can supply measure-

.ments to provide effective ICC monitoring of the reactor core under low-power conditions; e To provide data to determine the boundary conditions on unambiguous RIM ICC monitoring performance - depressurization rates (break size), flow rates (pumps off sensitivity), and refill repressurization; o To confirm that the absolute temperature measurement provides a good indication of coolant temperature above the core-in an ICC event, and obtain data on how closely the RIM reflects fuel thermal performance; e To provide data to select the optimum sensor types and arrangements in the. RIM probe for ANO-1 and ANO-2.

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Y Section 5 OVERALL CONCLUSIONS The breadth of the parameter space in the three test series was significant. Variations in blowdown rate, reflood rate, initial tem-

.f perature, and initial flow were included. Further, three sensor types and three gas-gap length variations within two of the sensor types were tested. The overall conclusions are: ,

1. All RIM rods maintained their mechanical integrity, operability, and performance throughout the tests.

2. All RIM sensor types respond well to blowdown and reflood transients and could be utilized as ICC warning devices with relatively simple type-specific data processing.

3. Inventory loss or gain rate can be determined in addition to i nv entory.

4. There is no practical difference in response of RIM rods con-taining different numbers of sensor locations (12- and 16-cable pack designs).

) 5. The response of the sensors is predictable, including variations in absolute temperature and flow.

6. Absolute thermocouples in the RIM rods can be used to trend fuel cladding temperature.

7. RIM sensors in the instrument guide tube can be used to indi-cate fuel surface conditions.

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