Text

Forwards Significant Condition Repts & Associated Calculations Outlining Problem,Methodology for Resolution & Proposed Corrective Action Re Moderate Energy Line Break Flooding.Sargent & Lundy Revised Rept SL-4424 Encl
	ML20235G783
Person / Time
Site:	Sequoyah
Issue date:	07/02/1987
From:	Gridley R; TENNESSEE VALLEY AUTHORITY
To:	; NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
Shared Package
ML20235G786	List: ML20235G783; ML20235G815;
References
	NUDOCS 8707140379
	Download: ML20235G783 (20)
	v • d • e

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TENNESSEE VALLEY AUTHORITY CH ATY ANOOG A, TENNESSEE 374ol SN 157B Lookout Place JUL 0 21987 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C.

20555 Gentlnment In the Matter of

)

Docket Nos. 50-327 Tennessee Valley Authority

)

50-328 SEQUOYAH ITU'fLEAR PLANT (SQN) - HODERATE ENERGY LINE BREAK EVALUATION TVA identified the restart corrective actions for the moderate energy line break floodir.g, stuaies in section III.15.2 of Volume 2 of the Sequoyah Nuclear perf 7raance Flan.

Two significant condition reports, SQN NEB 8520 and SQ'i NEB 8Ct7, were referenced in the discussion of this problem.

NRC requestsd by telephone that copies of these significant condition reports be provided in order to complete their review of this issue. Ccpies of the significant condition reports and the associated calculation are encloved. These documents outline the problem, t.he methodology for resolutica, and the proposed corrective actions.

If you hcve any questions concerning this matter, please telephona M. J. Burzynski at (615) 870-6172.

Very truly yours, TENNESSEE VALLEY AUTHORITY l

/'

R. Cridley, Dire tor Nuclear Safety a1d Licensing Enclosures cc:

see page 2 l

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8707140379 B70702 ADOCK OSO(/g7 g

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An Equal Opportunity Employer l

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,0 t-U.S. Nuclear Regulatory Commission JUL 0 21987 cc (Enclosures):

Mr. G. G. Zech, Assistant Director for Inspection Programe Office of Special Projects U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 i

Atlanta, Georgia 30323 Mr. J. A. Zwolinski, Assistant Director for Projects Division of TVA Projects office of Special Projects U. S. Nut leer Regulatory Commission 4350 East West Highsay EUW 322 Bethesda, Maryland 20814 Sequoyah Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379 l

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ENCLOSURE SEQUOYAH NUCLEAR PLANT MODERATE ENERGY LINE BREAK DOCUMENTS 1.

SCR SQN NEB 8520 - Significant condition report for pipe break flooding outside contairnaent 2.

-3CR SQN NEB 8617 R1 - Significant condition report for pipe break flooding outside contaitunent 3.

SQN-SQS4-126 - Moderate Energy Line Break Flooding Evaluation Esport, SL-4424 i

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There is inadequate documentat ion to conclude that the e f fort s of finnd inr. a f t( r

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M were cognizant of the requirement, the ft.ilure to enter the task into the task B

a n.e i unmen t logs resulted in the failure to assign the tank and schedule a date for S

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i1GNIFICANT CONDITION REPORT 4.1.g B25

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ATTACHMENT 1 TO SCRSQNNEB0617R0 IUeornbinetiotrWinadequately spec.ified interdivisional responsibilities ar.d lac %gln;bLT ty.cf the Ineed to perfofm~the anal ~yIfs."~More"specif1Va'll'y 'the

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pipe,brest anutysis* report identified the need for the flooding study via t.

alngfi seatenet whichamad.".

shall be evaluatedlelet impact an'd environmental effects..." (see section 3.2. CEB. 72 22.)

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artalysis, evaluated jet and temperature ofrects of MELBs. Jhe I evalust,e flooding affect.s m. Hf.3. h:4,;vla informal agreement! Yey, did no.t,,..'""

c' ptVd'i.fid o

p responsibility for these. At issued CES.72 22 appeared to*tt. comp?.ete.s w howeve~r, the flooding eva-Itsetlen either 5.s not performed or insufficiently documented.

The omission of MELB flood!r5.was _not recognized until a 7 ? documentationxepgr.ade terassure complianc9 with anylronmental qua1Tric_ation requirements discovered the oversight.

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ATTACHMENT TO SCR SQN NEB 8617 (RI)

CORRECTIVE ACTIONS FOR HELS FLOODING

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3 w'The purpose of. 'his report is:to provido an. updated listing of all corrective e.

t NN f'9N IEgar{les w.Eec tar trittgspe; moderate energyallDe bgesksT

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, dent hich.of these., corrective actions must.be completed prior to 4

gNpMcQaiWhelaype into resogpglsreferesc,osys:ndesuperadesM pf,edommeagran,.the nexts r

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gcJecomendations/ Corrective: ActionsET'7~~"~ii.EW ~ ~~ ~^

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c<m The revised recommendations from the Sargent and Lundy Engineers (S&L) " ~

floddihsleila10idi'on~fd7MElls~frifer' eihie 1) are given in Attachment A.

Attachment B defines the complete set of corrective actions that remain to be- -

implemented to address these reconumendations. Corrective actions that have

__.already..been.1mplemented..are.not listed-in-Attachment Ib The corrective-actions are divided into actions required for unit restart and post restart items.. Justifications for decoupilng the poet restart ite:as are given in Attachment C of the Engineering Report. The post restart items should be addressed as soon as practical. Corrective action (if any) needs to be completed prior to the startup for fuel cycle 5.

Additional corrective. actions may..be identified when S&L lasues the revised power system analysis portion of the HELB flooding evaluation.

. -. -... - - - - ~.. - - -. -

- - ~~ -

The results of the corrective action are to be documented in either (1) a QIR.

If appropriate, or (2) a memorandum to H. L. Jones with copies to RIMS and il. G.' O'Biidi. ~ This 7will then be referenced in a summary repcrt which will

~

document a11' corrective actions as indictted in Attachment A.

References 1.

Sargent and Lundy Repcrt SL-4a24. Moderate Encrgy Line Break Flooding Evaluation revision dated August 29, 1986 (S45 861217 218) 2.

D. W. Wilson's memorsndum to Those listed dated October 3. 1986 (B25 661003 023) e*

3.

D. V. Wilson's memorandum to H. L. Abercrombie dated September 10.1986

__..-(B25 860910 006)

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4 D. W. Wilson's memorandum to SQEP Files dated D4ceeDer 12, 1986

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5.

D. W. Wilson's memorandum to DNE Flies dated October 14, 1986 l

(B25 861014 001).

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NE8 1/29/87 s

A rracauenr A l. s..

r SARGENT S LUNDY -

7-1 i

SL-4424 08-29-86 Rev.12-12-%

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,. rercan erg +nM JCONCLUSICNS AND RECOMMENDATIONS- -

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.The%111tyWowhieve.sife-shutdown was demonstrated for postulated MELB flooding events

'provided the.fpilowing recorprnendations am imp.lemented;

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' 4teacIVA:Testf.rocedure.SL-126"ECCS Injection Pump Operability," should be

_I m.., revised to include the requirement, for both Division A and Division B safety wen.injec. tion puma cubicle. doors to. be open curing functional testing of either u...opump. This is,only required during surveillance testing of the safety injection a.er... purnpA and.npt during plant-wide 51 signal tests.a This requirement ensures

,,t what. design _ basis.t.MELB flood, loads in these cubicles are less than the r

cen llowable live loads provided by TVA.

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2.+.The auxiliary building / turbine building and centrol building / turbine building

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e.c:.. gal {,should be flood, protected to elevat, ion.706 feet,0 inches.,,,

[~~" HNPlin@tM ones E4'9.0-A6' 7fl9.0-A7, 749.' -A10, and 749.0-A11 should be 0

. shown^ to ' be equivalent to Seismic Category 1(L) Pressure Boundary

'",y RetentMn. This'rnay/eijuirelsprinklei head r6odificitrons.

4. ',.Coriddit'containing chblesrequire'd for'MELB safe shutdown that are located below MELB flood levels should be sealed. Alternatively, the cables may be shown to be qualified for submergence.

S-Conduit containing cables connected to safe shutdown power supplies that hre~. located 'below 'MELB flood levelsin areas affected by borated water "shobid be sealed.' ' Alternatively, the cables may be shown to be qualified for submergence.

d

Revise the protective device settings for the following main ci cuit breakers 6

in accordance with the recommendations contained in Sargent & Lundy Calculation No. SQN-EPS-001-1:

R Board Breaker Location C&A Building Vent Board IAl-A 480-V Shutdown Board 1 Al-A I

C&A Building Vent Board 1B1-B 480-V Shutdown Board 181-B C&A Building Vent Board 2Al-A 480-V Shutdown Board 2Al-A i

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. SARGENT 8 LUNDY 7-2 SL-4424 08-29-36 Rev.12-12-86' 4

7-Verify the structural adequacy of walls and floors in Zones 669.0-A13,669.0-A16, 714.0-A7, and 714.0-A8 for the flood levels provided in NSLD Calculation 3CT/%38tt01', Revisloh' mat' '

?

Flooding in 11. reactor building annulus must be limited to 2 inches by, a

providing free ilow in the drain system or modification to the detection and i ne ao.,ir.. isolation.systenwwows. u> camov u e.

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R U~ VY' P he Ted fEt'.YEh'eEder *t6 *the 'efueling water storage tank and certain T

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%ssdm' d toh, cooling systern piping,.in Zones. 714.0-A7 and 714.0-A8 are componegt e

bet th6 chick sclosion crit'eria. "" ' ~~~ ~

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/d ['?idoyious opefdd6n of hisociated eE0ipment that 'rdight prevent safe shutdown d

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i PROGRAM FOLLOWUP-Sargent & I"un.dy recolnmends'that TVA summarize implementation of the above rec 7mmen-t dation[thr$ug~l[ issuance of

[ A calculation "MELB Flooding-Summary of Corrective

~'

' Action.s."7 Thi.I c.aldula..ti.on will' document cor.rective actions taken by TVA to ens.are that

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the intent.cf the Sargent.& Lundy. recommendations is met.

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ATTACHMENT B SEQUOYAH NUCLEAX PLANT MELD FLOODING - ACTION ITEMS I

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-The-eet ie*4 tem:--f:r th; ; err;;;i ce acthstr-hea vem i s. b d

...J t wmwered-from those in reference 2.

The recommendation numbers correspond to those in Attachment A.

l This attachmen't3rer2ectsusadeelslon teill)ietop work on ther" active" approach for turbine building flooding"and42)simpicmentithe" passive" approach of

.k sealing.thoutnntrola'nndhautillary< boundaries for turbine building flooding to

)

t elevation 706. These two alternative approaches are described in reference 2.

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After resttetr EEBtwll)> determine:which'cofrthe.. parallel efforts on conduit sealing 4(able' submergence in actions items 2.2.? and 2.2.3 will be pursued.

f The revisionect the:' protective.devicoesettings.:per recommendation 6 is a generic ~ lssus:'-that:tsobroader: than MELB events. This will'be handled separatelysm?The~ protettivecdevices for'C&A Building Vent Boards IA1-A and 2Al-A are being addressed in SCR SQN EEB 86124 RO.

The revision of the protective:devicersettings'forJ.CLA. Building Vent Board IB1-B is an enhancement and doesinot< involve an SCR or PIR.

"IC-1.

ACTION ITEMS REQUIRED BEFORE UNIT 2 RESTAET ut.

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.,, Mechanical Disclellee 4etion items a

CIG-TurblGihl-lent-FlooMniM BarHvc Intetrity --(Recommendation 2)

Close tha. drain path.from the turbine building to the control

,as mar,,

buildi,ng,as def fned in J. C. Xey's memorandum to V. A. Blanco dated December 17, 1986 (B25 861217 005). Assure that the current sealing provisions of the doors potentially subjected to turbine building flooding meets the design.

1.2 Electrical Discipline Action ftoms 1.2.1 Turbine Building Flooding - Barrier intearity - (Recommendation 2)

Seal conduit PL 3057 in accordance with existing drawing requirements as defined in C. R. Brimer's memorandum to H. G. O'Brien dated January 26, 1987 (B25 870126 001) (reference Work P,gquest WR B218260).

1.2.2 Flooding Electrical Equipment on R1evations 734 and 7a9 - Expand the evaluation in QIR SQN EEBB5003 (B25 850101 002) to verify that the electrical equipment in all of the electrical boards on elevations 734 and 749 are above the MELB flood levels defined in the flood level calculation SQN-SQS4-056 (B45 870106 428).

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l DNE1 - 3145Q NEB 1/3/87 1

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ri SEQUOYAH NUCLEAR Pl. ANT MELS FLOODING Sheet 2 of 5 ACT20N ITEMS 1.3 Civil Discipline - Action Items

............,.,~..

143.1.. Turbine Building Flooding - Barrier Integrity - (Recommendation 2) -

Assure that ozistion sealing of turbine building :o concrol building hatch cover at E1. 685 is restored to design condition (reference

'. 6 8 : c a t ac Werk. Requestt B208207)t iu.

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tc turoin* oussain.. s oocira e r..

n.: ; e e r -

s e a.. r.l. Los. antrc. ar.a aux..i tr s oranu u. c.

4 elvetLact Nu e l oa'en 0d e c ipl i n eL Atti onk 'I t erar 060 a r ere ut: ~?

r.1 d:1res:Reviev of-Unimalementi,d ECNs.. Updatesthe. previous review of seb.:ntexauntsp4ementoutECNs to'determino if subsequent ECNs impact the flooding evalue.tlon.

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c is; sei gera:1..lasus in6. :: urosor- ;or:

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sto5re te ' Plantr Mans _ger'av0ffice Action Items. -

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cic5al.:n. Annulus Flooding wo(R0 commendation 8)

Develc? en instruction to

. provide, operating surveillance of the annulus arain sump alarm system ano u e:

(associated with LS-40-12A ar.d LS-40-12B). Duvelop provisions for inspection of annulus for flooding if the alarm syrtem is inoperable # ;". Revise : system operation instructions SOI-55-1-1H15 and SOI-55-2M15 to add an action to opon valve 77-920 to drain the annulus sump to t)o auxiliary building passive sump. The time

. margins.for.inspecgjen.if the system is inoperable and to open valve 77-920 is about 4 bours. These provisions may be discontinued upon icompletion of action' item 2:.1'.3..

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POST RESTART ACTICN ITEMS

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2.1 Mechanteel Discipline Actiot Items

.2.1.1

. Turbine Building Flooding - t_arrier Integrity - (_ Recommendation 2)

. Implement improved sealing of mechanical penetrations in control and auxiliary building boundaries.es defined in part of ECM L6790 and J.

C. Key's memorandum to SQEP Files dated October 1,.1986 (825 861001 064).

Improve the discharge path and capabilities of the control building sump pumps for turbine building flooding ennditions. Add a

{

sump, puma ilf...roqu.lred),to.the south mechanical equipment room, relevation 669 in the turbine bul! ding.

Provide the information on

. tbe. barrier: leakage during turbine. building flooding as requested in QIR. NEB 86244 (845: 861126 252)..cbtainisupporting information as

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SEQUDYAN NUCLEAR PLANT MELB FLOODING Sheet 3 of 5 ACTf0N ITEMS 2.1.2 HPFP Seismic 1(L) Capability - (Recommendation 31 - Document that the HPFP. lines in.zonca 749.0 -A6. -A7

-A10, and -All will not have a j

loss-of-pressure boundary in an carthquako. The llPFP modifications t

related to these zones as defined in ECN L6770 end J. C. Xey's memorandum to SQEP Flies dated October 1, 1986 (B25 861001 064), are field completod.

2.1.3 Annulus Flooding, - (Recommendation 8) - Develop methods of providing free flow An drain system similar to WBN.

(A possible alternative if this approach is not practical is to upgrade the flood alarm system -

see action item 2.2.5).

2.2 Electrical Discipline Action Items j

,.2.2.1 Turbine Building Flooding - Barrier Integrity - (Recommendation 7)

Perform the electrical penetration sealant modification for the conduits entering the control / auxiliary building from the south mechanical equipment room elev6 tion 669 in the turbine building as defined in ECN 6828. Document the adoquacy of electrical penetrations for turbine building flooding to elevation 706 for the

" passive" approach and quantify any estimated leakage, (Reference Wyle Test Reports No. 17333-01 and -02.)

2.2.2 Cable Submergence - 1 Recommendations a and 5) - Dovelop an engineering ~ justification that cables will operate satisfactorily under MELB subscrgence conditions. See inputs from referenco 5. S&L

'fB45'860905~218),' SQN EQP, and VBN EQP. Document the justification.

g This is an alternative to action item 7.2.3.

2.2.3 Conduit Sealing - Recommendations a and 5) - Seal the conduits for (1) cables required for HELS safe shutdown which are located below the MELB flood levels and (2) cables connected to safe shutdown power supplies that are located in areas affected by borated water. Thia should be combined to the degree practical with the conduit sealing for the flooding from high enorgy line breaks (HEL*1) to resolve SCR SQN EQP8621; EQP has conducted testing of conduit coupilngs for MELB l

conditions and the additions 1 fleid inspections, or verifications, to identify the conduits below MELB floed levels. EEB has conducted more formal testing of the conduit coupling and condulet sealing (see Wyle Test Reports No. 17833-01 and -02).

If there are large number of conduits involved, it may be cost effective for NEB to arrange for S&L assistanco in reducing the set belew the size of the (1) S&L safe shutdown set of August 12, 1986. and (2) set of cables connected to safe shutdown power supplies that are located in areas affected by borated water.

If problora areas arice where the flood depth or duration excoeds the MELB conduit couoling test conditions. (such as in the UHI zone). NES can assis' in d'eveloping a1tornate approaches (such as curbs, door modifications, etc.).

Document the adequacy of the conduit sealing. This is an alternative to action item 2.2.2 (see reference 5).

DNE1 - 3145Q NEB 1/3/87 s

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,_,,,__-,------,___~-----A

i SEQUOYAH NUCLEAR PLANT MELB FLC0 DING Sheet 4 of 5 ACTION ITEMS 2.2.4 Conduits Actinr as tlater Fjpes _ Evaluate the TVA concern on the acceptat4111ty of wr.ter, which may leak through fittings on flooded conduits,;being routed via the condule to essential equipment at othertlocations. These conduits are being sealed or rerouted for the HELB. effort. S&L did.not consider this failuro mechanism in their study. Seal the conduits if noaded. Document the resolution cf this concern.

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2.2.5 AnpulustFlooding

LRocommendation 8).. Upgrade the annulus dr ain sump alarmisystem 1._f. required. See' action itom 2.1.3.

2.3 Civil Discipline - Action Itoms 2.3.1 Turbine Building Flooding - Barrier Inter.rity,

_(Recommendation 2)

P: ovide the information on.the carrier leakaSe dtring turbine building. flooding as requested in QIR NEB 86242 (D45 861126 253).

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2.4 Nuclear Diselpline Action Items s-2.4.1 Turbine Building Floodinr. - (Recommendation 1)

Evaluate estimated inleakages through the control and auxiliary building boundaries to determine if these are within the design capability of the sump and aump_,pumpsgDevelop additional methods of handling the inleakage if needed; u t::. e s.. -- n unx: w x

2.4.2 Evalusto Unintended (Spurious) Operations.. (Recommendation 10) 1 Evaluate unintended operation per section 5.5 of Project Instruction PI-SQ-5 in referance 1.

Idlatio~nNa,1vesvit'h'PowerRomoie~d'-Developtuethodsofaddressing 2.4.3 the use of. motor operated valves with power removed for isolation of pipe breaks in a timely manner. See punch list item 1 in the system isolation calculation. SQN-SQS4-055 (B45 870106 426).

2.4.4 Non-Seismic Piping Evaluatlog - The analysis in section 6.4 (page 25), and Appendix B of the safe shutdown analysis calculation.

SQN-SQS4-057 (B45 870106 427). needs to be expanded from the HELB safe shutdown set of oquipment to the full set of Seismic Category I equipment por section 7.1 of the project instruction PI-SQ-5 in referonce 1.

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'SEQUOYAH NUCLEAR PLANT MELB FLOODING Sheet 5 of 5 ACTION ITEMS i

2.4.5

-Backflow-Throurh-Drains

-The treatment of backflow from higher

' floors'through drains into lower floors in Appendit H in the flood "l'erel calediations'SQN-SQS4-056 (B45 970106 428) will be expanded por

'it5m 1"In the' punch'11st"forlthis calculation.

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2 2.4.6 Rivisio568f MELB"Chiculations.'The calchlatiens will be revised to

- address the punch list items and the unverified assumptions. The j

more significant items and assumptions are listed as separate action 1

%N4hiESfMilstifthl $0h$ss%f any non-lA'iriputs' such as telecons

+

T

'55il'sd#EpifEd$dtoQIRiifneeded.

2.4.7 Addition of Flood Levels to Environmental Drawingt - Add the MELB

-flood' levels-to-environmental data drawing series 47E235, 2,4.8

-irmut-- ter: Operations 9 Provi-de-input-to-ONP SDO. for their use' for

'either (1) procedures.(2)' training, and/or (3) background. This 7

'will"be design output (or functional information output).

2.4.9 Summary of Corroetive Actions - Document the final corrective actions

-in'a calculation that is referenced in the summary report as

--indicated in Attachment A.

_w.:.:

_ a.

2.4.10 Licensing Documentation % Revise'FSAR Section 3.6 to reference t

flooding study in next FSAR revision.

It has been determined that a

'ssparate'subm'ittal t6'NRC is'not needed.

I

2.5 Plane

Manager!* Of fice-Action--Items-J-

2.5.1 Safoty Injection Test Mode - (Recommendation 1)

Revise test procedure per recommendation 1 in Attachment A.

t.::.:.. : :. a.'-

2.5.2

-Survallanco'on Flood' Alarms - Develop a' procedure for surveillance j

-testing of the turbine, auxiliary and reactor building flood alarm

'(detection) system, turbine building station sump level alarm, etc.

See TVA commitment in section 6.3.2.11 of the FSAR.

I l

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Ok 8EC0r.3 TVA 10597 (DNE-CA--86)

I)NE CALCULATIONS l Title l Plant / Unit j

l l_ MODERATE ENERGY LINE 8 REAM FLOO0 LNG EVALUATION REPORT, SL-4424 1 Sctl/l & 2 lPrcparing Organization

,, _jKEY NOUNS (Consult RIMS Dascriptors List) j ONE/NFB/ SOS 4 _ _

l-MELBr Sargent & Lundy, Pipe Ruptures, Flooding l

l Branch / Project identifiers

'~

Toriginal(RO)RIMSaccessionntv:berisfilledin.

leach time these calculations are issued, preparers must ensure that the l

lSQN-SOS 4-126 lRev (fer RIMS' use)

RIMS ACCESSION NUMBER 845

'87 0521 426_.

]l g---

, Tg[' ll Applicable Design Document (s6, J.

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l lSAR Section(s) l UNID Sysfun(s) l

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l l 3.6 l N/A

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l Revision 0 1

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R3 ISafety-related?

Yes (x)

No ( )

l lECN No. (or Indicate Not Applicabiel[ m t :j;.

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.l Statement of Problem l

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l l Doctrnent an organized overview of work per-l

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l fortned by Sargent & Lundy to evaluate l

lCluc'ked'

~.: --_ 4 _ a _ _. _. l _ _. __ J _.

Scuderate energy line break (MELB) events.

l.

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lk l Approved

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l S ~- 2 0 - 4' 7 g

g lUSE FORM l List all pages added,, _,j,_,,

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l liVA 10534lby this revision - - --- I-

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llF MORE l List all pages deleted l

l l

l l SPACE lbythisrevision l ~ - ~~~ - I ~ ~ - I l

! l l REQUIRED l List all pages charged cl

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lby this revision l

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l ABSTRACT [These calculation.s contain an unverified asstrmtion(s) that must be verified later.

Yes (X) o l

u.

l Sargent and Lundy (S&L) has prepared a' comprehensive safety evaluation of MELB flooding for SQN composed of l svaluation criteria, data packages, calculations, and an evaluation report. This calculation doctrients the eval-l uation report, Moderate Energy Line-Break Flooding Evaluation Report, SL.-4424, revision 2 dated March 6,1987.

l The S&L report summarizes work perforned by S&L to evaluate MELB flooding events for SQN and serves as a guide

{

l that shows the relationships a:nng the supporting calculations produced in tho evaluation. The design criteria l

l for the evaluation are provided in Appendix A of SL-4424. Section 3 of St-4424 strnarizes the methodology, the l

l major elaents, ated the individual calculations In the evaluation. Section 3 of SL-4424 indicates that the l

l evaluation demonstrates the ability to achieve safe shutdown for postulated MELB ficoding events provided that the I ]

l recommendations listed are implemented. This calculation consists of this coversheet and Attacterent A.

j l

l The TVA corrective actions to address the S&L recermendations (unverified asstrrptions) will be sunmarized in TVA l

1 l calculation, MELB Flooding Sumery of Corrective Actions, SON-SQ54-59 (to be issued).

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l ( ) Microfilm and store calculations in RIMS Service Center Microfilm and destroy. ()

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l (x) Microfilm and return calculations to: R. S. McKeehan Address: Wl0 AS2 C-K cc: RIMS SL 26 C-K H. L. Jones, DNE OSC-A, SQN DNEl-45110 C. R, Britner, DNE DSC-E, SQN W. S. Raughley, W8 Cl26 C-K R. O. Barnett, W9 D224 C-K C. Weir, Wl0 Cl26 C-K C. A. Chandley, W7 Cl26 C-K i

MELB FLOODING EUALUATION REPORT Sheet 1 of 1 6/'7/97 Prepared by/Date I

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SQN-S,QS4-126

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Checked by/Date CEAl AlztJ77 i

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Content :

Attactnnerrt-A-Cv.u Cheet-1--P4 ^

Report"Signout Log 1 Page MELB Fir)oding Evaluation report 3

5L 4474T--Revivi an--T,--Marctr 67-1987--

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' COORDINATION LOG Document No.: SON-SOS 4-126

Title:

MODrRAt" r"roCV t T'Ir FP r Av ri onn 7'm r" A t t A-vnu nennn+

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Rnision,: RO R-Cenotes review A-Cenotes acorovat DIVISION OF ENGINEERING AND TECHNICAL SERVICES (DETS)

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ML20235G783

Contents

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2.2.5 AnpulustFlooding

2.5 Plane

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ML20235G783

Text

2.2.5 AnpulustFlooding

2.5 Plane

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