ML19320C519

Forwards Photographs of Two Minor pop-up Features in Upper Part of Plattsmouth Limestone in Ultimate Heat Sink Excavation at Facility.Concurs W/D Fenster & Site Geologists That pop-ups Were Caused by Differential Thermal Expansion

ML19320C519
Person / Time
Site:	Wolf Creek
Issue date:	06/02/1980
From:	Wilson F KANSAS, UNIV. OF, LAWRENCE, KS
To:	Lefevre H Office of Nuclear Reactor Regulation
Shared Package
ML19320C517	List: ML19320C516 ML19320C519
References
NUDOCS 8007170317
Download: ML19320C519 (7)

Text

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2930 ^ venue ^ canmu= we=t KANSAS GEOLOGICAL SURVEY Enviro mental Geology Section I.aw rence. Kansas 06044 913 804 4001 June 2, 1980 MEMCRANDUM

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TO: Harold Lefevre, USNRC f

FECM Frank W. Wilson, Kansas Geological Survey,,

/

SUBJECT:

Limestone " pop-up" in Ultimate Heat., ink Reservoir, Wolf Creek Nuclear Power Plant, Kansas.

On April 28, at the request of Dave Fenster and Ray Seiple, Cames and Moore consultants, I looked at two minor pcp-up features in the upper part of the Plattsmouth Limestene in the Ultimate Heat Sink ex-cavation at; Wolf Creek. Copies of 8 x 10 photos of the features are attached. Figure 1 shows the end of the northernmost feature at its closest approach to the plant. Figure 2 shows the north pop-up, look-ing generally south. This feature involved a thin layer of dense limestone, several inches thick, underlain by a few inches of shale.

The shale and the lirestone below the shale parting were not affected (Figure 3).

Figure 4 shows.he south pop-up, again looking generally south.

This feature involv(d the upper few inches of the very dense limestone below the thin shale parting :nentioned above. Figure 5 (see keys for scale) shows that only the upper few inches of the limestone were in-volved, actually seeming to spall off the upper part of the bed with an apparent conchoidal fracture. The limestene below was not affected and one of the Oames and Moore site geologists was not able to penetrate it after repeated strong blows with a pick axe.

According to Dames and Moore personnel, the Plattsscuth Limestone had been covered by about three feet of shale and clay during the winter and some water was ponded on top of the shale. This material was removed by the g.ading contractor shortly before the pop-ups were noted. The pop-ups probably occurred on April 23.

Cn April 20, aceording to site records, the daytime high temperature was 89'F, the highest temperature to date, af ter a comparatively cool spring. Maximum temperatures rose to the upper or mid-80's on the 21st and 22nd. Nighttime lows were in the low 50's, 60's, and 70's.

The weather during that period was sunny and it is likely that the newly.

expcsed limestone surface was heated by the sun to temperatures several tens of degrees above air ambient.

80071703/7

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Because the limestone had been covered by the insulating layer of shale, it is probable that its temperature at the time of removal of the shale was 55*-60*F.

The upper surface of the Plattsmouth Limestone in the Ultimate Heat Sink appears to be devoid of vertical joints, although tightly closed or incipient joints are undoubtedly present.

Rapid heating of the upper surface of the newly exposed limestone by the sun probably caused a temperature differential of 50*-60*F be-tween the upper few inches of rock and the cooler mass of rock below.

Thermal expansion of the warmer upper layer of rock was prevented by the apparent lack of jointing until its breaking strength was exceeded, causing the pop-ups. The process probably is analogous to the explosive pop-up of concrete pavements at joints which occurs commonly in this region during extremely hot weather.

I now censider it probable that a larger pop-up which, occurred suddenly in a quarry floor at Humboldt, Kansas, and which I discussed with you several years ago, was caused by a similar mechanism.

I concurred with Fenster and the site geologists that the pop-ups were most likely caused by differential thermal expansion and were not tectonic in nature.

FW/ep cc: Dave Fenster Ray Seiple T

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