0191-9067/85 $3.00 + .00 Copyright ® 1985 SUNSAT Energy Council CONCEPT OF SPS OFFSHORE RECEIVING STATION AND POTENTIAL SITES Y. YAMASHITA Tokyo Kyuei Co., Ltd. 3-1-15, Nihonbashi Chuo-ku Tokyo 103, Japan H. HASHIMOTO Central Research Institute of Electric Power Industry 2-11-1, Iwato-kita, Komae-shi Tokyo 201. Japan Abstract — A 5 GW-class Offshore Receiving Station (ORS) was proposed which is located within the 200 mile economic zone, in water depths up to 200 m and at 30-40 deg N lat. Seven potential sites were selected: five on the Japan Sea coast, two on the Pacific coast. The sites were selected by imposing natural, social and power generation requirements. Based on seakeeping capability, earthquake countermeasures, and past construction records, the structure of ORS was selected to be of a floating semi-submersible type. The ORS is elliptic in shape whose long axis in the north-south direction is 13 km and whose short axis in the east-west direction is 10 km in length. An ORS is supported by 160,000 pieces of bottle-shaped steel float whose displacement tonnage is 458 tons. The main floor of ORS is made of honeycomb deck plates to allow solar light to penetrate through it. Construction of an ORS is undertaken by the following sequences: I) a block (50 m x 200 m in floor area) having 16 floats is fabricated in ship yard, 2) 16 blocks are towed to the construction site to form a unit (400 m x 400 m in floor area) and 3) 625 units are assembled to complete a set of ORS. Several engineering problems associated with the construction of ORS are suggested such as mooring, analysis of external loading and dynamic seakeeping or ORS, etc. POTENTIAL SPS SITES Assuming an ORS (Offshore Receiving Station) to be constructed within the 200 mile economic zone in water depths less than 200 m, potential SPS sites are confined to the area shown in Fig. 1. Further, by imposing the conditions that the sites 1) have relatively gentle bottom slope and stable seabed, 2) are exposed to relatively good weather condition such as less typhoon passage, no icing on rectenna, etc., 3) are subject to relatively small wave and current loads and 4) are not constrained by social environment such as ship route, defense training area, fishing activity, etc., seven potential ORS sites are selected as shown in Fig. 2: five on the Japan Sea coast, two on the Pacific coast. Hokkaido was not considered as a larger ORS as is necessary, due to the higher latitude.
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