ML18031A053

Discusses Trip Rept to Visit Site & Observe Plant Constr, Constr Prog,Found & Trench,Soils & Spray Pond Liner Were Inspected

ML18031A053
Person / Time
Site:	Susquehanna
Issue date:	12/19/1978
From:	Thompson O Office of Nuclear Reactor Regulation
To:	Stepp J Office of Nuclear Reactor Regulation
References
NUDOCS 7812280322
Download: ML18031A053 (2)

Text

DEC 19 l978

!~~I.ORlQ!DU}4 PO."..:

J. Carl Stepp, Chier Geosciences

3ranch, DQ".

TPRU:

L U. Belier, Leader Geotec}tnical ingineerin; Section Geosciences

})ranch, DSH Owen 0

inampson, Ceotechnical Hn".incar Geotech"..ical in.ineer'ng Sect=-'on Geosciences Branch)

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COrley) i)S;.) tls2 he our-,ose oaf "he visi" was to bcco-...e fat-.ilier ': th the s'te and the plant construction xeatur s.

At thc ti-e o~

Iy visit, the aa-'or part of the supexstructure w s co"piete and the installat on of the internal equip-.ent was in progress.

Construction of one cooling tower was within.20 feet of top elevation but construction of the other towex was only at foundation level.

he spray pond was lined with concrete and pray heads were being installed.

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""ngineered Safcguards Service.';1ater (I;"S'l) pmp house structure wa" cmpleted and equipment was being installed.

"."oundation soils;;enerally were not visiole but a util'ty trench attend'ng about lg.f t baealow,.tsda was open along tba south side ot the ESSM pump house

, The base o 'hc tr nch was appro imately at th'e s~-e elevation as-the base of the pond.

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J. Carl Stepp

.DEC 19 t978 Beneath a few feet of recent granular fillthe natural sands and gravels were visible.

" The natural deposits were predominantly fine to medium sands with occassional large gravel inclusions.

In the lowest part of the exposed section there was a layer of sandy gravel about 1 foot thick.

The gravel particles appeared to be less than 3 inch maximum dimension.

..within the sand deposit there were some lenses a few inches thick of~very clayey sand.

The subsurface soils appeared to be relatively compact since the sides were standing temporarily on near-vertical slopes.

The spray pond liner was complete but-some repair work was in progress.

Hair-line cracks have developed

. the liner and the contractor is chipping a groove alon" the cracks and filling the groove with a synthetic water-proofing compound.

The cracks were predominantly on. the side slopes but the base slab was muddy and may have cracks also.

.At the time of my visit, some of the cracks had been filled, sade had been grooved and not filled, and some had not been worked on.

The cracks did not appear to extend deeper than a few centimeters.

Furthermore, the Contractor had drilled into some cx'acks in the northeast corner of the spray pond and reportedly had found that the cracks did not extend through the slab.

At thc time of my visit these holes had been filled with water proofing compound.

The water-proofing compound is non-hardening and easily deformed when pressed witir a finer.

The remainder of my visj.t cons'sted of a conducted toux'f the plant and explanatton to the Applicant of my Round'>Pl Questions dated

.ovember 29, 1978 in a memo from L. Heller to 0. Parr.

DISTRIBUTION DOCKET FILE (50-387/388)

NRR RDG GB RDG Owen'hompson, Geotechnical Eng'neer Geotechnical Engineering Section Geosciences

Branch, DSF.

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R. Denise L. Hulman L. Belier S. Niner O. Thompson ACRS (16)

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