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Show NASA Postpones The Salt Lake Tr.bune, A5 Experts Sav U.S. May Be Exaggerating The Sei iousness of Chernobyl Disaster Weather Satellite Launch CAPE CANAVERAL. Fla iaP, -NAiA on Thursday postponed for 48 t'jors the first spao launch hrre s.nr e tne Challenger al'er a small fuel leak raised contern tr.at the Delta rocket carry ,ng a weather satellite would not ream orbit The leak of about a quarter-cu- p of kerosene-typfuel past a vahe in the mam engine was found a little more than three hours before the rocket was to blast off The launch was rescheduled for 6 18 p m Saturday ' There was no chance of an explo. There was concern that sion the rocket could lose thrust and not have a burn, preventing it from going into orbit, said NASA spokesman George Dillard It is not uncommon to have a small amount of leakage m the engine system, which is at the bottom stage of the three-stag- e rocket, officials said But too much of a leak could cause a break in the fuel lines, leadmg to the loss in thrust After discovering the leak during a routine test early in the day, engineers conducted two further checks that failed to produce any additional leakage But they decided to flush and purge the engine fuel lines, followed by additional tests, Dillard said The flushing and purging takes about 13 hours If the valve needs to be replaced, that would take 10 days, said NASA spokesman Hugh Harris The Delta, the space agency's most dependable launch vehicle is to carry a weather satellite designed to fill a critical surveillance void during the coming hurricane season. The flight attracted considerable attention because of the explosions of the space shuttle on Jan, 28 and of a Titan 34D rocket in California on April 18 Until problems with those vehicles have been corrected, the United States has only two rockets, the Delta and capable of lifting is heavy satellites An to be launched here May 22 with a Navy communications satellite. Scores of reporters and cameramen from around the nation were dispatched to cover Thursday's liftoff The last several Delta launches here attracted fewer than a dozen news personnel Launch director Charles Gay said he didnt feel any undue pressure, but he conceded. Obviously the agency would like to see a success here. In ds'er, e n carry a companion from a riot in streets of Manila. Nearby, the leader addressed a peaceful gathering. Aquino supporters Riot Police Disperse Violent Clash Between Marcos, Aquino Loyalists Los Angeles Times Service MANILA. Philippines Riot troops fired tear gas grenades and water cannons and arrested more than 60 supporters of former President Ferdinand E Marcos after riots ing broke out Thursday between of Marcos loyalists and supporters of President Corazon thou-sand- Aquino It was the biggest episode of street violence since Aquino came to power two months ago At least 33 persons were injured, two with gunshot wounds, during the hourlong street battles, which authorities said destroyed hundreds of thousands of dollars worth of property in the heart of Manila's tourist district The violence erupted just a few hundred fe.t from a downtown park where President Aquino was addressing tens of thousands of union leaders , Atlas-Centau- 2, l'M6 Frida?, May r, Atlas-Centa- and workers during the countrys nual Labor Day celebration By Jill Laurence Associated Press Writer WASHINGTON Nuclear indus try experts said Thursday the US government may have been exagger aung the seriousness of the nu iear realtor accident in Chernobyl even as the Soviet government was trying to min. maze its impact They said Soviet da.ms that only two people died in the accident are more so, in fact entirely plausible than unverified reports repeated by various government officials that as many as 2 OoO may have died The experts as w ell as members of a government task force also called into question earlier suggestions from unnamed U S officials who were citing intelligence reports a day earlier raising the possibility that two reactors had been involved in the accident sources Reagan administration citing intelligence information, have postulated a disastrous chain of events involving a meltdown, chemical explosion and nuclear fire at one reactor along with hints that there may have been problems at the sec- an- Aquino made no mention of the violence in her speech, in which she granted major new concessions to organized labor in the Philippines One top aide said the president was unaware of the nearby rioting while she was speaking clear what sparked the g between and the two groups, but friends of the deposed president said that Marcos personally had warned them by telephone several days ago to remain at home Thursday "because there will be trouble in the streets It was not rock- - bottle-throwin- The main group involved in the oting had broken away from a ri- demon- stration by Marcos loyalists outside the U.S. Embassy. ond Turn Cor hran senior staff scientist with the Natural Resources Defense Council an environmental watchdog group said he did not know whether the U S intelligence community was overstating the seriousness of the accident He added 'There are a number of factors that suggest that it could be very serious But they could be consistent with something much less serious given what limited data we have " Earlier Thursday. Secretary of State George Shultz had told reporters the U S government had a much fuller picture of the disaster than what the Kremlin was telling its people He said casualties were higher by a good measure" than the official Soviet line Two other US officials earlier this Research Shoves Link Between Strokes And Heavy Drinking reactor CHICAGO (AP) ans Presidential Heavy drinkers are almost three times as likely as to have the kind of stroke that is most often fatal, and people who cut down on their drinking can reduce their risk significantly, researchers say Heavy alcohol consumption has been suspected before of contributing to strokes, which trail heart disease and cancer as the leading causes of death among Americans However, their study of 7,878 Hawaiian men revealed the increased chances of having a stroke in those whose blood pressure was normal If you're a casual Joe, a social drinker, we're not recommending any changes in that behavior, said chief researcher Richard P Donahue of the National Heart. Lung and Blood Institute in Bethesda, Md And virtually every official commenting on the crisis has dismissed the official Soviet death toll I imagine the Russians want to put the best face on it On the other hand, there are those who've said . . this is the worst thing that could have happened under the worst circumstances. The truth probably lies somewhere in between, said Frank Graham, vice president of the Atomic Industrial Forum "There are a lot of things that indicate it may not be the worst case," he added, citing relatively normal activity going on in Kiev, 80 miles south of the reactor complex "If it were still a tremendous danger and they had another plant going down, I think the Soviets would be taking additional precautions ... to protect their citizens in Kiev." wtrok dismissed Soviet claims of two deaths as ' frankly preposterous and ' beyond belief " Graham and Cochran, while saying they suspect fatalities were higher tnan two called the Soviet figure of piaus.hle and "within the real credibility." Alan Krass, senior analyst for the Union of Conceited Scientists, a nuclear safety watyodog group, also called the low number conceivable Krass and Cochran both satd 2,000 casualties an unconfirmed estimate widely quoted on Capital Hill was a more preposterous number than two "Radioactivity doesn't kill that fast It s not an instantaneous killer like at Bhopal with the poison gas, said Krass Krass said the satellite pictures and infrared images on which US intelligence analysts are basing their conclusions are not definitive The unique situation makes it even harder to interpret the images, he said, because there is nothing to compare them with spokesman Larry Speakes and a U S task force monitoring the accident both said Thursday that they could not confirm reports of a meltdown or fire at the second reactor although administration sources had strongly suggested Wednesday that was the case. "The second hot spot seen in the LANDSAT photos is not a reactor, the task force said in a statement, Speakes said it could be another building burning Cochran said a Soviet photograph of the plant after the accident showed no smoke or flames coming from the second reactor building Graham said the fate of the second reactor is still highly speculative. "If you want to be optimistic, you can say it wasn't really so bad at (the number four reactor), theyre forgiving machines, so probably number three is all right." LONGINES WITTNAUER Gift Ideas For MkDttOocDLP9Q Waaqj today's environment, considering what has happened, a success would be uplifting " William Graham, NASAs acting administrator, said the launch is important because we need this satellite and we need to remind ourselves that we have had success m the space program." The Delta has logged 43 straight successes, dating back to September 1977, and has logged only 10 failures in 177 flights in 26 years. The rocket's payload this trip is GOES-7- , the seventh in a series of geostationary operational environmental satellites. It cost $57 5 million to build and the National Oceanic and Atmospheric Administration is paying NASA $42 million to launch it. The satellite is to replace GOES-5- , which lost its ability to transmit cloud pictures two years ago, cutting in half the nation's weather watch capability from stationary orbit, 22,300 miles high. Normally, two fixed weather satellites are over the Atlantic and Pacific Oceans, looking at the United States from the East and West. However, after the failure of GOES-5- , the eastern satellite, GOES-- 6 was repositioned from the Pacific to a point south of Texas to cover the whole country from a central location. 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