ML19268B947

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Notifies Met Ed That Measures to Ensure Integrity of Containment Structure & Ability to Ensure safety-related Performance Acceptable.Recommends Repairs Be Completed to Ring Girder Prior to 1978 Refueling Outage & Fourth Insp
ML19268B947
Person / Time
Site: Crane 
Issue date: 07/07/1977
From: Shao L
Office of Nuclear Reactor Regulation
To: Goller K
Office of Nuclear Reactor Regulation
References
NUDOCS 7910220621
Download: ML19268B947 (5)
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EHORAlfDGt POR:

E. R. Coller. Asalstast Dirseter for Operatiaa teactars.

Division of operst.ieg Raaetors F&dNa L. Shao. Chiaf Engissering Branche Division of Operating Easctors a

a SUBJECT TERig KILE 151AND WIT. 20.1 - R2 ACTOR COHtAINKDff I

3DILDDdC = LING CIRDER SURVEILLANCE TEST TWO TRALS j

AFTIR 8.3.7. (TAC,6602) e Plant Menos threa Mile taland Unit ha. 3' Liceostag States (4,wrattag Plant

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. Decaents aseiswedt. W ThreaMe. #:$9.M *~ ', '.'

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l tafermatico provided by Liaansee ta

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%.* 4 Latter.to R. v.:said. dated June 3. 1977 7, W,'

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.,.armach and Project unmager aaquesting Assistanoes ots-4. G. testais,/ f. T 3 w-Regeseted completiae tota: 7 tat?h

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,;The Engineering Star.ch. Dfyistoa of Operating Reactors has reviewed * * 'l,'.

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, the structsral and material sapects of the inforestion entwitted by the i

Metropolitan Edboa company la a submittal dated Septenbar 17, 1976 i

detaillag the reactor building ring girder surveillance progras done two j

years attar the structural integrity tast. This is in accordaned with i

THI-1 Technical spechuestion 4.4.1.24 We also teviewed the additional j

information provided by the liceossa in the letter cited above, as requested by the Engineering Branch en April 27. 1977.

_Seppe of taview In the two daemony e.ited above the 11eansee has addressed the folleving itsas:

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Serv.111ance acceptanee critaria,

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Strain gs" Steasurements 3.

Vis 1 1-tion 64 ermerate erscks and crack patterne in selected j,1, 4.

Inapacti done tenden baaring plate areas for cavitias voids and e

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eI h h eurvaillanes test was ecoduated during the period from April 21 f

1.976 through July 2, 1976. 8 train same amasursaants were taken to y

maaitor the strasess in the ring girder reiaforting bars. N ro has y

been ins appratiable shange la these stresses staea the last gaat.

.f Coacrata tracks and track pr.% terns La four whitewashed areas were 4

maamsted and recorded. All of the observed cracks widths were touco to be w tin accaptable limits. Eswevar seven concrate voids were e

. found.@ scent to the roaster WWae does tendan bearing platas.

N veias ware mesaured and an evaluaties was made to find the impact of thase voids on the strostural integrity of the reactor bu1141sg. It was fond that the voids de not decrassa the safety

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facters to whiah the building was originally built. W lissasee plana to repair these voids although it ta felt that tae voids do act impair strastural tatsgrity.

4 A 3 eatable for this repair is prwided alcaA with a diasuasion of t - asthods and materials to bc l

1acerparated.

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.h taformaties pewided by the H*~r la the docuasets e.ited

'. tadiastaa that the eury.m*= taste have been parformad in accord-esco with asisting regslatiana and that the actual safety marrias E.

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  • ta the strosture, at the present tias, are adequata. RaasopAM
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assurance has been provided to scafire that the tonem4-t n > m ;rs

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vill santiana to perform ato spea.lfied safety fumetion, Ceneluatees and Recommasedattens a.

N aain conclusion by the licensea is that the repairad rina girder le capable of fulfiuing its dasian funettons as required, despite

'I ainer deteriorations disclosed by the surva111ance tests. We concur with this conclusion. Eorever, we have the fellovic recounsadations:

1.

N repairs abould be performed as p1W and not later than the sad of the vafueling ostage of 1978.

2.

Section 4.4.2.IA of the TaA=ia=1 Specifications for has Rila Island Dait No.1 Crx1-1) requires four inspections of tha contatanent ring girder at various tians af ter the Structure 1 Integrity Tast. It also states that the requirement for further tarpection will be detsmined following review of the report of the fourth inepecties. Sectica 4.4.2.2D of the TKI-1 Technical Specifications requiras that a report of the results of aaeh ring girder eurvan o inspection shall be abbaitted to the WEc withis 30 da7e follerias campistica of the inspection. He races-mand on the baaia of the taferrmation prwidad by the licenses and available to os at this tias, that the fourth inspe:tice be SangenMm. >

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the licensen has also presented a discussion of uncoverad deficiencies.

f, the planned time table for repaire, the methods and materials.co ba used 3

for repair proceduras, and the safety factere providad. All of these itema have been reviewed by the Engineering Brssch.

Evaluatirm The information provided by the liconese in the documente cited indicates that the surveillance tests have baan performed in accordance with existing regulations and that the actual safety margas

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.ia the structure, at tha'present time, are adequate. Reasonable

, t assuraned has been provided to confira.that the f.onn%t, structure v111' -

. untinue to perform its specified safe:y function.

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.f, w e, The meia concinaion'by the'11canaes is that the..-repaired ring sirder e; ' N'.' t;?. ;,.,x 1." s f'./ N'd 4'

pc, %..,'... jg*, 4 is capable of fulfill 15g'ita design. functions er requirs

ainer deteriorations disclosed,by the sorveillsace tnsts. We concer

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p]- {e,'? n',f with this conclusion. "novever, we have the following raccamendations f'

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y' iThe rewirs should *we perfcirmed as planned'and not"later Lthan i

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h.?:N*j'?. p'?. ' Island thit' Es. '1('DfI-1)"requirse' four'inspes'tio EQ* ;L 'S1'.' A A D'MM.QQ,N6?iffMs.::.sb.O.:.c. % '..h.'.*l ',i.',NW '. W., '

C '_,?l5,5 2b section 4.4.2.2A 'ofI he Technica.1:#pecificatione'*for Three Mils

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Integrity Test. cit alse?.st.atee'that. the. requirement for further

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  • Inepection will be.d'etermined 'fallowins roview of the report of '. ~

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the f ourthainspoetion..i gestion',4.4.2.2D of the 'DfI-1 Technical

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Specifications requirss'that a reportif thh raeul'ts of oscb ring

'ch ~r girder surveillance inepection shall'be submitted to the NRC within 30 days following completio'n of.' he inspection. We raccmend t

on the basis of the informatfon*provided by thh licensee and available to us at this tind y that tha ' fourth inspection be per-formed as provided for da the Technical Specifications. This reconnecd-ation is contingent upon the performance of planned repairs in accordance with' our reco:mmendation '1) above. The need and the scheduling of fur-thar inspectione will be based en the results of the fourth inspectiou.

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performad as provided for in theffechnieA18pacifications.

This racoemendation is e.ontingent upon the perfernance of planned repairs in accordanea with our reecamendation (1) above. Tha

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naad and the scheduling of further inspections will be based on the results of the fourth inspoetion.

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