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~}6 ftX (LhJc W MEMCRANDUM FOR: George E. Lear. Chief Hydrologic and Geotechnical Eng_ineering Bruc:,
Division of Engineering THRU:
Myron H. F11egel. Leader i
Hydrologic Engineering Section Hydrologic and Gaotechnical Engineering Branch. OE
'FROM:
Robert A. Jachowski Hydrologic Engineering Section Hydrologic and Geotechnical Engineering Branch, DE SU8 JECT:
TRIP REPORT TO DIABLO CANYON AND MODEL AT ESCONDIDO -
SEPTEMBER 20-23, 1962 The purpose of this travel was to visit the Diablo Canyon Nuclear Power Plant site, the Breakuster/ Intake Structure Model At Escondido, and discuss with the applicant the hydrologic engineering review coarsents of the staff and our consultant (11. 5. Army Coastal Engineering Research Center) relating to the Breakuster/ Intake 5tm eture Reports, dated July 82.
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The fb11owing seemerizes observations and discussions with PG&E and their consultants:
Diablo Canm Nuclear Plant Site -
Intake 5tmeture - ! observed the construction modification work in progress on the Beergency Salt idater Pump Air Vents. Work is progressing on coring the concrete walls fbr re-bers and roughaning the concrete surface.
Breakusters - ! obsereed the rehabilitation work in progress. All of the 21.5 and 37 toe tribers (concrete armor units fbr the breakwater) required fbe the repair have been cast. Minety percent of the breakwater debris has been removed from the intake channel. Quarrystone for the breakwater repair is being stockpiled. Construction has connenced on the damaged end of the west breakwater.-
Breakuster/ Intake Structure Model at Escondido - I visited the physical hydrea 11e model operated by Offshore Technology Corporation and observed model waves of 20. 30 and 40 ft. height impacting on the Intake Structure.
Model Studies are expected to be conoleted in early October.
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i Discussions - PGAE made a brief presentation on the status of the r Pa': l' tat te of the breakwaters and the modifications to the Intake Structure.
I discussed both the staff and our consultants (CERC) hydrologic review coments on the p6&E - Breakwater and ASW pump air intake / vent model study reports.
I indicated the need to clarify certain a;pects of the report involving wave dinction of appmach and the need for a Technical Specification regarding the monitoring of the breakwaters, reporting condition, and connitment to implenent timely repairs of the breakwater.
I summarized my observations of both site and model visit noting two concerns:
(1) The Intake structure has concrete hatches in the roof to remove-the pumps (ASW). The hatches, flush with the roof, have vs.bber type gata seals to prevent leakage into the pump compartment. There is no positive means to battert down these hatches during the design tsunami / wave event to prevent possible flooding.
(2) Concrete slabs used to test load the overhead grantry crane are stored et the west end of the Intake mof area. These have the potential to be missiles during design tsunami / wave event if not battened down.
These casuments were noted by the applicant.
Photographs (slides) taken during the visit will be placed in the HGEB project file.
3 Robert A. Jachowski Hydrologic Engineering Section Hydmlogic and Geotechnical Engineering Branch, DE i
cc:
J. Knight L. iteller
- 5. Buckley D. Gupta DISTR!8UTION:
Docket File - DCD 016 DE:HGER Rdg. File l
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