ML20101L639

Forwards Description of Two Test Configurations to Be Tested in 1/10-scale Mark III Encroachment Test Facility,Draft Tech Spec Re Test Series 6104 Encroachment Test & Milestone Schedule for SER Confirmatory Issue 71

ML20101L639
Person / Time
Site:	Clinton
Issue date:	12/21/1984
From:	Spangenberg F ILLINOIS POWER CO.
To:	Schwencer A Office of Nuclear Reactor Regulation
References
U-0772, U-772, NUDOCS 8501020311
Download: ML20101L639 (14)

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1 o U-0772 L30-84(12-21)-L 1A.120 ILLIN0/S POWER COMPANY CLINToN POWER STATION, P.o. BOX 678, CLINToN, ILLINOIS 61727 December 21, 1984 Docket No. 50-461 Director of Nuclear Reactor Regulation Attention: Mr. A. Schwencer, Chief Licensing Branch No. 2 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Subject:

Clinton Power Station Unit 1 Plant-Specific 1/10 Scale Encroachment Tests Confirmatory Issue #71

Dear Mr. Schwencer:

Barred on Illinois Power Company's meeting with your staff on December 1,9, 1984 in Bethedsa, Maryland, we are providing you a program to address the effects of local encroachments on pool swell impact loads for Clinton Power Station.

The NRC sttff and consultants expressed concerns in the November 16, 1984, Containment Issues Owner's Group meeting that Clinton's plant-unique encroachments are not envelcped by the generic 1/10-scale Mark III encroachments tests.

Attachment 1 is a description of two test configurations which will be tested in the 1/10-scale Mark III encroachment test facility.

Attachment 2 is a draft test specification and Attachment 3 is a milestone schedule.

Illinois Power believes that the proposed test program will address your plant-unique concerns and will resolve this issue for Clinton Power Station.

Sincere yours 4.X. %

F. A. Sgang berg Director - clear Licensing and Configuration Nuclear Station Engineering Attachments JLP/lm cc: B. L. Siegel, NRC Clinton Licensing Project Manager NRC Resident Office Regional Administrator, Region III, USNRC Illinois Department of Nuclear Safety i

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o ATTACHMENT 1 Clinton Unique Encroachment Testing Two configurations will be tested in the 1/10-scale Mark III encroachments test facility.

The purpase for testing two configurations is to address the effects of Clinton's long circumferential encroachment from 22' to 120*

which consists of the TIP platform (22*-43*), equipment drain sump platform (43*-76*) and the personnel hatch platform (76*-120*). The attached Figure 1 shows the general layout of these encroachments.

Test Configuration #1 will represent the TIP and sump platforms.

Test Configuration #2 will represent both the personnel hatch platform and the equipment hatch platform (from 187* to 263*).

Test Configuration #1 will consist of approximately 4.25 cells encroached with radial extents of 42% and 38%. (See Figures 2 and 3).

The second configuration will consist of 3 cells encroached with a

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radial extent of 38%. This second configuration will also model the shielding blocks that exist above the personnel and equipment hatch encroachments. (See Figures 2 and 4).

Clinton-unique FSAR drywell pressures will be used as input into

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the model. The initial matrix authorized by this specification is 3 repeat tests of each encroached pool response.

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ATTACHMENT 2 DRAFT TEST SPECIFICATION MARK III 1/10 LINEAR FROUDE SCALED-

-PLANT UNIQUE RECTANGULAR ENCROACHMENTS TEST-(TEST SERIES 6104) i .

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TABLE OF CONTENTS - TEST SPECIFICATION

1.0 INTRODUCTION

/0BJECTIVES.

2.0 EQUIPMENT TO BE TESTED 3.0 TEST CONDITIONS 4.0 TEST QUALITY REQUIREMENTS 5.0 EXPECTED TEST RESULTS 6.0 ACCEPTANCE LIMITS 7.0 RECORDS AND RETENTION 8.0 DISPOSITION OF EQUIPMENT / MATERIAL 9.0 TECHNICAL / LEGAL RISK EVALUATION 10.0 SPECIAL TEST REQUIREMENTS REFERENCES 1

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1.0 INTRODUCTION

/0BJECTIVES-The Mark III 1/10 linear Froude scaled rectangular encroachments tests (Test Series 6104), will be conducted to determine the effect of plant unique encroachments on a pool swell transient. Previous 1/10 scale testing (Test Series 6101) determined the effect of typical Mark III encroachments on the transient. The major modification of this test series is that plant unique encroachment geometries will be used.

2.0 EQUIPMENT TO BE TESTED The multivent encroachment test will be performed in the drywell of the Pressure Suppression Test Facility (PSTF) utilizing a 1/10 linear Froude scale test system based on the Mark III containment geometry. As shown in Figure 1, this test tank will consist of a drywell (with volume of 44.8 ft )8 discharging into a weir annulus having 1/100 scale floor area per vent station (with width of 2.6 in.). In addition, six cells, each having titree horizontal vents of 1/10 scale length (6 in.) and diameter (2.75 in.), discharFing into a rectangular 1/10 linear scale pool of depth 22.2 in., width 22.6 in, and length 51 in., which represents a 48* sector of a Mark III suppression pool, will be modeled.

The wetwell airspace volume need not be specifically modeled, since the entire test tark will be installed in a vacuum chamber for the test.

The volume of the vacuum chamber, less the volume of the test tank and associated hardware and instrumentation must be greater than 220 ft8.

The test tank will contain removable encroachments attached to the simulated drywell wall in the corner of the suppression pool. This test facility will also include a quick opening valve which will admit the blowdown medium (air at atmospheric pressure) to drive the transient.

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These are the only primary suppression system components modeled.

Safety relief valves, the residual heat removal system, and other; auxiliary systems need not be simulated.

3.0 TEST CONDITIONS The initial conditions are to be set at the following values:

(1) Lrywell Initial Pressure 1.47 psia

, (2) Wetwell Initial Pressure 1.47 psia (3) Pool Initial Temperature Ambient (4) Top Vent Centerline Submergence 9 in.

(5) Blowdown Medium Air at atmospheric pressure 4.0 TES.T QUALITY REQUIREMENTS These tests will provide data to supplement.the current product design basis and expand the product performance data base. Thus, all quality assurance procedural requirements, performance and evaluations shall be consistent with E0P 35-3.00 requirements for a Type B2 test program (design basis).

l 5.0 EXPECTED TEST RESULTS The drywell pressure history will be measured to assure a response representative of the actual plant being tested. High speed movies of the pool response will be taken to determine the effect of the encroachment on the pool swell transient. It is expected that the i

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l encroached response will be slower than the clean pool response. It is also expected that impact characteristics at.the HCU floor level will be-less severe than those seen in the 'A' configuration of the Test Series 6101 testing (Reference 2).

-6.0 ACCEPTANCE LIMITS The measurement uncertainties and test initial conditions shall be set within generally expected instrument resolutions and possible environmental deviations. Initial conditions tolerances are given in the table below. However, deviations from these limits will be left to the discretion of the responsible test engineer in cases of adverse environmental or test conditions.

INITIAL CONDITIONS TOLERANCE PARAMETER SPECIFIED LIMITS j Initial Pool Temperature ambient Initial System Pressure 1.37 - 1.57 psia l Pool Depth 22.1 - 22.3 in.

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The required measurement accuracy for the drywell pressure measurement is 1 0.1 psia in the 0 to 5 psia range. The pressure measurement system must be capable of tracking a 10 psi /sec. transient. Data is to be l l recorded on a strip chart recorder with a dynamic response greater than l

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7.0 RECORDS AND RETENTION Output from the Data Acquisition System. (DAS), test logs, reduced -

data, and the method and results of the analysis performed shall be kept under Design Record File (DRF) number (later) with -(later)' as ' designated- l Responsible Engineer. The DRF shall be closed and microfilmed' following the issuance of the final test report in accordance with E0P 60-3.10, 8.0 -DISPOSITION OF EQUIPMENT / MATERIAL Equipment, facilities or other structures which are designed and ,

l built to fulfill the purpose of this test' specification shall be consigned to either the responsible test component's inventory or the Test Facility Operation's itivantory, whichever is considered appropriate by the Responsible Test Manager and Test Engineer.

9.0 TECHNICAL / LEGAL RISK EVALUATION (TRE/LRE)

A TRE/LRE is not required for these tests.

10.0 SPECIAL TEST REQUIREMENTS Provision must be made for the filming of high speed motion pictures. The viewing window must be large enough such that the test facility and a mirror which is at a 45' angle attached to one side of the test tank are easily visible in the films. Lighting from both the bottom and top of the tank must be available. The film speed should be approximately 500 frames per second.

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REFERENCES

1. McNamara, EJ, " Test Specification - Mark III Encroachments 1/10 Linear Froude-Scaled Bubble Pressure Equalization Test, (Test Series 6101)", PWA #3695ZZ Rev. OK, January 3,1984. J l

2. Mintz, S. et al " Mark III Ercroachments Summary Report", October, 1984.

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6. e s ATTACHMENT 3 Clinton Enerotchasnt Iecus Closure Schedule Milestones Schedule

1. Meeting with NRC to discuss Clinton's Dec. 19, 1984 proposal test configurations.

2. Issue Draft Test Specification Dec. 21, 1984

3. Issue Draft Test Plan / Test Procedures Jan. 4, 1985

4. Issue Test Specification. Jan. 4, 1985

5. Issue Test Plan / Test Procedure Jan. 11, 1985

6. Start Shakedown Testing. Jan. 11, 1985

7. Start Testing Series. Jan. 28, 1985-

8. Complete Testing Series. Feb. 8, 1985

9. Issue Apparent Test Report. Mar. 1, 1985

10. Issue Draft Test Report. Mar. 30, 1985

11. Proceed with Clinton Specific Load Mar. 2, 1985 Definitions (if needed).

12. Issue Final Test Report Apr. 12. 1985

13. Complete Load Defin' clons (if needed). Apr. 12, 1985

14. Start Clinton Evaluation of Load Definitions Apr. 12, 1985 (if needed).