ML20099D304

Forwards Evaluation & Proposed Resolution Program Re SER Outstanding Issue 8, Mark III Containment Concerns. Evaluation Addresses Effects of Local Encroachments in Suppression Pool on Pool Swell Impact Loads

ML20099D304
Person / Time
Site:	Perry
Issue date:	11/01/1984
From:	Edelman M CLEVELAND ELECTRIC ILLUMINATING CO.
To:	Youngblood B Office of Nuclear Reactor Regulation
References
NUDOCS 8411200297
Download: ML20099D304 (14)

Text

,

t -'THE CLEVELAND ELECTRIC ILLOMIN ATlNG COMPANY TELEPHONE (216) 622-9800 -- lLLUMINATING BLDo. - 55 PUBLICSQUARE P.O. BOX 5000 - CLEVELAND, ohio 44101

-Serving The Best location in the Nation November 1, 1984

~ MUARAY R. EDELMAN' PY-CEI/NRR-0151-L VICE PRESIDENT

- NUCLEAR Mr. B. J. Youngblood, Chief Licensing Branch No. 1 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D. C.

20555 Perry Nuclear Power Plant

. Docket Nos.40-440;40-441 SER Outstanding Issue No. 8 Mark III Containment Concerns

Dear Mr. Youngblood:

The purpose of this letter is to provide an evaluation and proposed resolution program to address the effects of local encroachments in the suppression pool on pool swell impact loads in the Perry Nuclear Power Plant.

Attachment A describes our evaluation of the Perry encroachment configuration and t'. results of the 1/10 scale bubble pressure equalization-tests. Based on our evaluation, CEI believes that this issue does not raise any significant safety concerns. To confirm this conclusion and demonstrate that plant structures and components are designed for pool swell loads, a proposed program for verifying the load definition for testing of the plant specific encroachment is outlined in Attachment 2.

The test specification for this effort is provided in Attachment 3.

The program and schedule for resolution supports our projected fuel load date.

We believe that the evaluation provided herein and the confirmatory test program will enable this issue to be resolved for Perry Nuclear Power Plant.

Very truly yours, M. R.

elman Vice President Nuclear Group MRE nje 8411200297 041101 i

8 PDR ADOCK 05000440 8l Attachments E

PDR

cc: ' Jay Silberg, Esq.

John Stefano J.'Grobe w

' Attachment 1 Evaluation of Applicability of l

1/10 Scale Mark III Encroachments Tests to Perry Nuclear Power Plant In early 1984, a series of 1/10 linear Froude' scaled Mark III endroachments

- tests were performed under the auspices of the Containment Issues Owners Group

_(C10G). The CIOG' concluded on-the basis of this test series that local encroachments in the suppression pool do not produce pool swell loadings in excess of the clean' pool design loads. This conclusion was' based on the observations that:

1.

The encroached pool response is always bounded by the clean pool response.

2.

The encroached pool breakthrough height is always less than the design breakthrough height.

3.

The encroached pool liquid profile an the containment wall is smaller radially than the cican pool wall profile.

The NRC and their consultants conclusions differed from the CIOG conclusions.

The Staff's assessment concluded that there could be a significant solid water impact at the HCU floor level _for type A encroachment (3 cells x 50%).

However, they did feel that the smaller encroachments, (i.e., "B" which was effectively 6 cells x 25% and "C" which was effectively 2 cells x 50%) would not cause an increase in design loads.

In the NRC's evaluation with the type "B" encroachment, the water ligament appears to be thinner and broken up much

more, i.e.,

to be froth-like, before it impacts at the HCU floor level. No adverse results were identified from the type "B" test data.

The Perry Sump room, which is the major encroachment in the suppression pool, is shown in attached Figure (1). The circumferential extent may be calculated in several ways due to the ambiguity of having a rectangular encroachment in an annular pool. Using the vent spacing on the drywell wall, the circumferential coverage is 4.3, while if the midpoint spacing is used, the circumferential coverage is 3.5 cells. Alternately a radial vector drawn through the encroachment corner shows that 32.6 or approximately 3.6 circumferential cells are covered. Thus, the circumferential coverage is less than the "A" or "B" series test encroachment configurations. The radial extent is only 35% which is less than the "A" or "C" series test encroachment configurations. Thus, the size of the Perry encroachment is closest to the

'B' series encroachments which was shown to exhibit froth-like impact characteristics.

A unique aspect of the Perry Sump Room is that it extends vertically up to the steam tunnel, thus not allowing breakthrough horizontally over the encroachment. The "B" series test shows that once the top surface of the bubble approaches the top of the modeled encroachment (approx. 10 ft. full scale) the bubble has achieved both vertical and horizontal breakthrough. This test series shows that breakthrough will occur irrespective of encroachment vertical height. Since the Perry encroachment is closest to the "B" series test configuration, vertical breakthrough is expected. This breakthrough would produce froth-like impact loads on equipment and structures located in the area adjacent to the sump room and approximately 10 ft. above the pool surface.

• Perry Equipment Hatch, Personnel Lock and TIP

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items affected by.poo11 swell. LiTableil 'shows the < results of Lthat :

f 'gt review. J.As'can be(seen.fromzthis attachment,l:only,the'LPCI,(E12).' piping:and-

Steam Tunnel are required post : accident. Due to,the elevation oflthe LPCI';_

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' piping ( and. Steam Tunnel,.! froth-like ? impact; loads ' (for lwhich" the. equipment is "

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/ designed);would.be expected. bas'ed2onithe'results of:the~"B"Jaeries test.-

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. In conclusion, -Perry ; feels thatj the 1/10:11near Froude1 scaled Mark III "B"

'_ toeries encroachmentEteet results are applicable lfor!our' Sump Roon encroachment.?

(Since the' LPCI piping Jand l Steam Tunnel' adjacent? o= thisi encroachment have been t

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designed-for froth l impact, ' pool:swelliloads are.'not'~a : safety l issue.

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f" iLTo' confirm.thisl. conclusion,JPerry' proposes:t'orunaplant-s'pecificjtest-inthe 1/10 linear'Froudelscaled Mark:III encroachment test facility.;LAttachmentl2-;is

.;a;. sche _dule re!1ecting the: program-for-resolving;theLSump, Room encroachment ^

f issue and Attachment 3Lis;the-test specification.. The; test program'and plans-S

for final resolution, will be' discussed in. future meetings.~with'the NRC staff..-

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y a. g W.. gpqqc >m ,yy 7 gg 3r apa v s &ga,, q y ~,y -4 , Y. sn qqpp g e % yc y @f M MV d i %;u;Q;w~ w<'" ' ] _ Q y [ o$kg% %Nyf w . 5 ATTACHMENT 1, J en v m .n a? . m m:.g 1 -> . syw My 7, u a, x::u i ~ v,, Mjn, r A;Q 4 %,;M'5,%, - ye ,n w W wp ghy u, + < .gy, w ..,f b; w n s[ I I. J t 4,,, a*, f Mf t[.... [ .h. @k ~ ' ~ ~ b~ Y gy% ,l4Sumpf oom'EncroachmentjIryuel, r y-l (; .,f. r R 'r er, s n; ~;;y. -' -, M Closure Schedule p r Nc ~ v;g 4 m my g "w m- ? , 1 : .s j:e -c1, r t Q 4 4 3 re ,c q yggg,g,,,,, 4 g.- i ( e? - Schedule i c 2 1 uev o_s o. ~E. .b,,. di - M . [, l. M. Aj 3, - 891, c 15 J19844 > oc t ~. 7 Jf. ~et it.' ' Conference' call.with:NRC.L - W& s sQyr- [ ; ?, v,, s, ~. ND . iAuthorizedGE"toproceedwithhw..,lantl specific; '$0ct.15k19847 M Ag: ~ 2; testiand jjustification:Ts' ump ronn encroachmentL V i r p" h'2 '9 [ isi not"a 'saf a*,y ~ concere'*n l [,1 ; ' N % , w $ :p y y $ g f.: @ p; @ h.f T 2. _, x, (3.; JGAI/GE/CEI' meeting f.tof finalisktest i.c'onfigurati.on ? 7r N vand:susp room encroachment justification;>. Oct.516,11'984 + i J e gg,, j. , :7 S App ,4, s ~ ( G, .4.' ' : Receive from lGE(testWeheduld. & sump room Lw/o. 0ct.122i '.19.841 e+ q g,,, Jjustification.,. W, ~@s, g, t 4 ',.. ' 1w, < A/c J 15.: s sg . Response to NRC.7 ' y' . 4 Q~ w j 4 ,w/o50ct.f29. 1984 : f W. % w. '

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) Issue Draft l Test Specificationf VNovu 2h 1984' r r t ~ ,s a c7.. (Meeting with NRC to Discuss-Testing' Program; cNov.~15, 19841-i y% - t :g. n

8,

, Issue Draft Test Plan /Tess: Procedures -Nov.'16,01984 V^ w 5 e i.g a-4 4 !j, ~ f 9k LIssue Test Specification.3 N, 'O 1Nov. 19,L1984 o-3 C-.+ i 'n A r' '! - f. .s g L10. - .Issy Test Plan / Test: Procedure Nov. 30,;1984~ s ,4 ~ y y .11 1,

Start Shakedown. Testing.

Dec. ' 3,: :1984 -

5 -StartTestingdyu riks... Dec. 10, 1984 c?,

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Complete Testing Serie? '?, y 3 -i Dec. 14. 1984- -a

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s. . m ,r ,(Iss'e Apparent Test Report. .Jan. 11, 1985' 14. ' u id M 15.- ' Issue Draft Test. Report. Feb. 4, 1985 i 5. - m

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16'. - Proce41.with Petry Sepcific LoadzDefinitions Feb. 4,71985 7 ? N (if1needed).: S w-x, g~ > 17.', Meeting with NRC to discuss Draft Test; Reports w/o Feb. 18,11985 e g v; r 1 q<'18.' Issue Fin &l Teat Report Feb. 22,'1985-J.L,sg. g 1 ^* f y : a> ~ 19.. CompletefondDefinitions'(ifneeded). Feb. 25, 1985 s e ^ e' o 0, 20. ' Start Perry Evaluation.of Load Definations O March 1, 1985

(if needed).

un t. i1 ' [1 - May 1, 1985 m f% 21.V Complete Evaluation.(if needed). - ! y+4 ( ' 22. - w/o May 13, 1985- - i 4 .r r ,e . Meeting with NRC to discuss' Clos ure of Issue. o Le .k.: : q t n;, .., m.. c ^ 'h

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TEST:SPECIFICITIO'N g

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MARK 111:1/10 LINEAR FROUDE SCALEDL

' PLANT UNIQUE RECTANGULAR ENCROACHMENTS TEST' ,'Ef. (TEST SERIES'6102); F ' PWA'No.~5221XL~REV.0 lDRF NO.;T23-00595i I s. ' November 5, 1984 '7 ~ Ie 3 ) 1 m w me- . - +.., _m._.p.- pie.- h- --y- -39,(Jia-.+ ewr >A -ih-- c 3 'v: p _- x S. TABLE.UF CONTENTS - TEST SPECIFICATION'- 2 1.0.l 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 DISP 0b1 TION OF EQUIPMENT / MATERIAL 9.0 TECHNICAL / LEGAL RISK EVALUATION. 10.0 SPECIAL TEST REQUIREMENTS REFERENCES; APPENDIX-PERRY UNIQUE-ENCROACHMENT TESTING ~ e. e t i V 1 I \\ N-s 2 L^ \\ + .-,__.,L.,,

1.0 INTRODUCTION

/0BJECTIVES The Mark III 1/10 linear Froude scaled rectangular encroachments tests (Test ' Series 6102), will be conducted to determine the effect of-plant unique encroachments on a' pool swell transient.

Previous 1/10 :

scale testing (Test. Series 6101) previously determined the effect of typical Mark III' encroachments on the transient. - The ' major modifica-tion 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 n the Pressure Suppression Test Facility (PSTF) utilizing a 1/10

~1inear Froude scale test system based on the Mark III containment geometry.

As shown -in Figure 1.

This test tcnk will consist of a 3

drywell (with volume of 44.8 ft ) 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 havin'g three horizontal vents of 1/10 scale length (6 in.) and diameter (2.75 in.), discharging 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 sup-pression pool, will be modeled The wetwell airspace volume need not

-be specifically modeled, since the entire test tank 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 ft 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.

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.

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4 3.0! TEST CONDITIONS

. The initial conditions are to be' set'at the following values:

..(1)

Drywell.Initia1' Pressure

1.47 psia

~

1.47 psia =

-(2) -Wetwell Initial Pressure-

'(3) Pool Initial Temperature open

=(4) ' Top-Vent' Centerline' Submergence-9 in.'

(5),~. Blowdown' Medium Air at atmospheric pressure 4.0 TEST QUALITY REQUIREMENTS

~

These tests will. provide' data to supplement _ the - current product

' design basis and expand the. product pe'rformance data base.

Thus, all grality assurance procedural: requirements, performance and evaluations shr:11 be consistent 'with E0P 35-3.00 requirements -for a Type B2 test program (design basis).

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-the1 pool response will be'taken'to' determine the effect of the encroachment un the pool swell transient. It is expected that the encroached responae 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).

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6.0 ACCEPTANCE LIMITS

'The measurement uncertainties and test initial conditions shall se set within generally expected instrument resolutions and possible environmental deviations.

Initial conditions tolerances are given in Lthe-_ table below. :However', deviations. from these limits will be lef t to the discretion of the responsible test engineer in cases of adverse environmental or test conditions.

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-INITIAL CONDITIONS TOLERANCE' PARAMETER SPECIFIED LIMITS

Initial Pool Temperature

-Initial System Pressure -

.l.37l-1.57 psia Pohl Depth 22.1 22.3 in.

4.

j.

lThe required: measurement accuracy for the drywell pressure measurement is + 0.1 -. psia - in the l 0 ' to 5 psia range.1 The' pressure measurement

~ system must be' capable lof^ tracking a 10 psi /sec. transient.. Data'is to : be^ recorded on.a strip chart '~ recorder with a - dynamic response greater than the rest.of the measurement system.-

~

7.0 4 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 T23-00595 with M.N. King as

~

b de'signated. Responsible Engineer.

The DRF shall be closed and micro-

~

filmed 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 built to fulff a the purpose of this test specification shall be consigned to either the responsible test component's inventory or the Test Facility Operation's inventory, 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

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I facility:and a mirror which is at a 45"' angle attached to'one side-of-i

-the test tank are easily. visible in the films.-:. 1ighting from both,the l

- bottom and top;of the'~ tank must'be available.

The film. speed should -

be ap'roximately 500 frames per second.:

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' REFERENCES 1.

McNamara,' EJ, " Test' Specification - Mark III~ Encroachments 1/10

' Linear Froude Scaled Bubble Pressure Equ'alization Test, (Test Series 6101)", PWA #3695ZZ Rev. OK,' January 3,.'1984.

~

2. Mintz, S. et al." Mark III Encroachments Summary Report", October, E

1984..

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.g Appendix A Plant, Unique Encroachment Testing; I. Perry Sump Room The Perry unique.drywell. pressure history is specified in Chapter 6 of the Perry FSAR. The Perry ~ Sump Room-is 28'feetclong and 6.5Lwide at-its minimum distance as shown in' Figure A-1.

This room extends to the Perry stesa tunnel which.is located 20 feet above the initial pool surface.-

The in'itial ~ submergence of' the sump ' room is 16 inches.

Details of how this encroachment will be modeled in the-' test will be specified in the Test Plan and Procedures (TP&P).

The initial matrix authorized by this; specification is 3 - repeat tests of the encroached pool response. If a field modiffication of the encroachment _is required -however, up to 6 additional-tests are also.

authorized.--

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