ML18025A579

Pennsylvania Power & Lights 10/30/1975 Letter Geologic Information of Further Exposure to Previously Discovered Slickensided Bedding Plane, Requiring No New Conclusions to Reported Analysis

ML18025A579
Person / Time
Site:	Susquehanna
Issue date:	10/30/1975
From:	Curtis N Pennsylvania Power & Light Co
To:	Butler W Plant Licensing Branch 1
References
12689, 840-2, ER 100450, PLA-88
Download: ML18025A579 (2)

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NRC DISTRIBUTION FOR PART 50 (TEMPORARY FOR DOCK ET MATER IAL M)

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0 TWO NORTH NINTH STREET,'ALLENTOWN, PA. 18101 October 30, 1975 PHONEME t215) 821 ~ 515.1

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HOCSP% "0 Director of Nuclear Reactor Regulation Light Water Reactor Branch No. 1-2 U.S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:

Dr. Walter R. Butler, Chief SUSQUEHANNA STEAM ELECTRIC STATION GEOLOGIC INFORMATION ER 100450 FILE 840-2 PLA-88 Docket Nos.

50-387 50-388 V y'I;

Dear Dr. Butler:

In conJunction with our policy of keeping you informed of the progress of construction of our Susquehanna Steam Electric Station Prospect, we previously reported to you (our letter No. PLA-44), that during the excavation and clean-up of the rock foundation beneath our Reactor and. Turbine Buildings, we uncovered an old bedding plane showing prominent slickensides.

Our report contained.

a complete response to your questions including an analysis of the age relationships of the materials encountered.

along the planes.

More recently, in August, l975, we have observed.

a similar slickensided. bedding plane along the vertical face of our circulating water pumphouse excavation and approximately 500 feet west of our Reactor Building.

We have performed an analysis of this bedding plane and. have concluded. that it is a continuation. of the previous~ reported old,, slickensided.,

cemented bedding plane.

The conclusions in our previous report also apply to this recently observed 'bedding plane.

The analysis of these geologic features indicates that no problem exists, 'consequently we plan to begin backfilling operations in the circulating water pumphouse area in about three weeks.

Observation of this bedding plane along the excavated rock slopes was discussed in a telephone conversation between our Messrs.

W. L. Bohner, R. W. McNamara and C. T. Coddington and. your Mr. J.

M. Cutchin on October 24, 1975.

Ifyou have any questions on this matter, please contact us for additional information.

N. W. Curtis Uice President-Engineering K Construction RWM/CTC:AAW PENNSYLVANIA POWER 8

LIGHT COMPANY 689