ML19220C093
| ML19220C093 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/20/1974 |
| From: | Henderson J US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Robert Carlson NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 740722, NUDOCS 7904280220 | |
| Download: ML19220C093 (4) | |
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JUL 2 2 '.SN R. I. Carlson, Cnicf, Facilities Ccua tr ction & Cagineering Support 3ranca,.k:;1cn I Tc.2U:
- 7. V. Feyfrit, Chief, Iccanical Assis tance 3rsuch, EC ThKEZ MILE ISLA51) 2 IJSPECTICN - JULY 9-10, 1974 F.aclosed is my feeder report for the subject inapection. You vill note that it assentially writes off the problen. I ha<e talked this over with Larry S~ ac sad Alex Glnehan of L:TR, and they see= to be quite a
relazed aoout tae situatica, based on my discussion.
'aten tne report is fornally issued, Licensing plana to ask Metropolitan Edicon to meet with them and ase. for a low-key discussion of the situation either in an amendwnt to the FS.G or in a separate report fren the licensee.
Inis is not, however, expected to require a detailed presentatics on the part of the licensee.
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'4ep J. 3. Henderson Senior Machanical En W.eer Technical Assistance Branch Directorate of Regulatory Operaticas
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7/19/74 7/19/74 Forms AIC 113 (Rev 9-53) AZCM 0240 Q u. s. s o v a n= = s =t **m tm 3 o r **c u s 's ?*
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Details E bed ent of temporary supporta in permanent concrete structure.
Prep : red by:
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Y /7!) N J.ju.
'enderson, Senior Mecnanical Engincer Te:hn al Assistance 3 ranch Date D[ree ce of Ecgulatory Cperatiens Dates of Inspection:
July 9-10, 1974 A
n'f Reviewed by:
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K. 7. Seyfrit, Chief /
7.2.27/
Technical Assistance Branch Date
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Directorate of Regulatory Operations 1.
_ Persons Centacted
- 3. H. Avers, Quality Assurance Manager, General P bli Service Cc=pany (GPUSC) u c Utilities James H. Wright, Civil' Resident Engineer, G?USC Matthew Giannini, Site Liason Structural Engineer, Burns & Roe
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General (3&R)
This part of the inspection was conducted to examine of the decision to permanently e bed in the structuralthe documentation been installed to supportrefueling canal, certain te=porary s tructural concrete of the ports which had cocpletion of the containment building.the centainment building polar crane pend work in progress. examination of records cf work performance and limitedThe insp examination of 3.
Back 2round During the early stages of the project, sequence planning.
as part of the ccustruction to be installed inside containment would be deli, the fact was establis vered early in the o/
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construction sequence. These =ajor elcrents ceasisted of the reacter vessel, the rwo steam generators, and the ccatainrent building crane bridge and :rolley. Early ins:allation 0: :his equip:en: wculd elizinate the necessity to provide a large construction opening in the wall of the contain=ent building.
Based en this, agreement was reached De ween :he owner, the AE (ELR), and the ccus: rue:cr, to schedule ear:
cc:ple: ice
~'w # the permanent foundations for :he reactor 'iessel 2nd the s:ea:
ge:erators, and to provide a te porary structurc to suppor: the crane girder approx 1:a:ely in its final pcsition, un:il the contain en:
building had reached a degree of completion which would perni: supper of the crane on its pe--'m-* support systen.
To i plerent this latter decision, 3&R issued, en December 19, 1963, Drawing 4143, describing a support system consisting of four la:: ice steel towers, 5 feet square b, about 136b feet tall, spaced 28 feet en centers one way,108 feet en centers the other way.
The towers were founded en the centainment building botton ficar and extended approxi:2:ely to the hei;ht of the finished building wall.
They were stiffenec by structural angle "X" bracing in the narrew (28 foot) direction, and by renovable cable """
bracing in the icng (108 foot) direction supple =ented by renovable horicantal trusses at the tcp.
The tcwcrs and end panel bracing were erected prior to icstallation of the reactor vessel and s:can generators, the bracing in the side panels was left out for place:ent access until these vessels had been ins:alled.
Exa=ina:1cn of constructica photcgraphs showed enat the reactor vessel was installed on March 29, 1972 (the reo steam generators had already been placed) and that by May 19 72, the crane had been installed en the te=perary supports.
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E= bed ent of Tevers In the original construction sequence, the plan was to delay installatica of structural concrete internal to the centain=ent building until af ter the containment building had been ec=pleted to a point where the crane could be positioned on its permanent supports, and the te=porary supports could be re=oved.
Ecuever, shortly af ter the cvers were installed, this plan was =cdified, and the decision was reached to embed two cwers in Obe structural concrete of the fuel handling pool walls, frca the cca-tainment ficer to the operating floor, a height of 65 feet. This decision is documented in Engireering Deviation Request (EDR) 1011, approved March 15, 1972, which states in par:
."The two acrth towers shall re=ain in place and becc e embedded in the fuel pool wall.
. ". This decision was stated during the inspection to have been made in the interest of construction scheduling. Delay of fuel pool construction until after the towers had oeen rencved would have resulted in a delay and increased cost to the everall construction schedule.
The presence of the :cwer s: eel required codifica:icn of the concrete reinforcing steel arringerent. These cdificaticas were defined and approved by EDR's :!1027 and./1159.
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. Work Perfor ance The 5 fcot horicental dimension of each tcwer is slightly greater than the fuel pcci wall thickness.
Thus the 6 x 5 x b inch corner angles and the 2h x 2h x 3/16 inch lacing angles were enly parti;. e: bedded in the cencrete. Depending on the local condi:icns, the forms were ei:her fitted to the angles and concrete was placed solidly, or plas:ic fcan blocks were secured to the for s to exclude ccacrete frc the vicinity of the angle e:bedcents.
In either case, :he specifica:ica required that af ter the forts were ra=oved, anv tower steel within 2 inches of the concrete surface was to be cut away, and the concrete was to be locally repaired : provide a mini =u: of 2 inches of concrete cover ever tower steel which re=ained embedded.
This work was in progress at the time of the inspectica. Where the concrete was being recoved locally to prcvide access to cut back the embedded steel, there was evidence tha: the original concrete was
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sound and well placed. In the areas exa=ined, where the steel had been excised but the excavatica had not been refilled.
The steel was in all areas recoved at least 2 inches deep.
Since the repair areas we,re generally several inches wide and several feet icng, concrete replacement was by for=ing and placement of fluid concrete. Place ent vind. a and inspection vindows were cbserved to be located at appropriate intervals.
Examinatica of replacement concrete where for:s had been recen:1y recoved indicated good consolidation anu bond to adjacent concrete.
One area of particular interest was en the interior sides of dhe fuel pool wall where renoval of tower steel to a depth of several inches was required in order to embed anchcrages for the fuel pool liner.
This work had been completed at the time of the inspection.
It appeared to have been performed acceptably.
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