Throughout Saturday night and the early hours of Sunday, county
emergency preparedness offices were deluged with telephone calls from
citizens concerned by the conflicting reports about the hydrogen
bubble. But the flow of useful information from the state to the local
level had essentially ceased after Denton's arrival. The Governor's
office focused attention on the federal effort -- Denton and officials
from several U.S. emergency agencies. Oran Henderson, director of the
Pennsylvania Emergency Management Agency, was no longer invited to the
Governor's briefings and press conferences, and he did not attend
after Friday night. Thus PEMA -- although it continued to receive
status reports from the Bureau of Radiation Protection -- was isolated
from information wanted at the local level.
In Dauphin County, frustration ran high. Shortly before
midnight on Saturday, State Sen. George Gekas called the Governor in
an attempt to obtain accurate information. Gekas was told the Governor
was too busy to talk. Then Gekas called
Scranton, and got the
same response. At that point, Gekas told a
Scranton
aide that unless more cooperation and information were forthcoming,
Dauphin County would order an evacuation at 9:00 a.m. Sunday. Scranton
called the county's emergency center at
2:00 a.m. and agreed to meet officials there later in the morning. The
Lieutenant Governor arrived at
10:00 a.m., preceded
by Henderson, who complained of his own inability to obtain
information. Scranton listened to Molloy and his colleagues. "I think
he was just totally shocked by what was transpiring at our level; how
busy we were; how much work we were doing; how complicated it was,"
Molloy said in his deposition.115
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Sunday, Mattson and several other NRC staffers met with NRC
Commissioners Hendrie, Victor Gilinsky, and Richard Kennedy. Their
purpose was to reach a judgment, based on the estimates and
information available, about the true potential for a hydrogen
explosion inside the reactor. According to Mattson's deposition, the
group agreed:
5 percent oxygen was a realistic flammability limit, 11 percent
oxygen was a realistic detonation limit, that there could be no
spontaneous combustion below 900°F, that the oxygen production rate
was approximately one percent per day, and that the present oxygen
concentration in the bubble was 5 percent.116
After the meeting, Hendrie and Mattson drove to TMI to meet with
Denton.
Stello talked with
Denton
Sunday morning and outlined his arguments against any danger of a
hydrogen explosion inside the reactor. Pressurized water reactors, the
type used at TMI-2, normally operate with some free hydrogen in the
reactor coolant. This hydrogen joins with the oxygen freed by
radiolysis to form another water molecule, which prevents the build-up
of oxygen to a quantity that would allow an explosion to take place.
Stello told Denton that the process was the same now, and there was no
danger of explosion.
Hendrie and Mattson met with
Denton
and Stello in a hangar at Harrisburg International Airport minutes
before President Carter's 1:00 p.m. arrival. Mattson and Stello had
not talked to each other since Friday morning. Mattson outlined the
conclusions reached at NRC headquarters about the bubble and the
reasoning behind them. In an interview with the Commission staff,
Mattson described what happened next:
And Stello tells me I am crazy, that he doesn't believe it, that he
thinks we've made an error in the rate of calculation . . . . Stello
says we're nuts and poor Harold is there, he's got to meet with the
President in 5 minutes and tell it like it is. And here he is. His two
experts are not together. One comes armed to the teeth with all these
national laboratories and Navy reactor people and high faluting PhDs
around the country, saying this is what it is and this is his best
summary. And his other [the operating reactors division] director,
saying, "I don't believe it. I can't prove it yet, but I don't believe
it. I think it's wrong."117
Upon the President's arrival,
Denton
briefed the Chief Executive on the status of the plant and the
uncertainty regarding its infamous bubble.
The President was driven to TMI, put on protective yellow plastic
shoecovers, and toured the facility with Mrs. Carter, Governor
Thornburgh, and Denton. Stello, Hendrie, and Mattson went to the
temporary NRC offices. During the afternoon, experts -- including
those at Westinghouse and General Electric -- were canvassed by phone.
"By three o'clock, we're convinced we've got it," Mattson said in his
interview. "It's not going to go boom."118
NRC scientists in
Bethesda
eventually reached the same conclusion, but later in the day.
Shortly before 4:00 p.m., NRC Commissioners Richard Kennedy, Peter
Bradford, and John Ahearne met. They expressed concern over the
differing estimates presented by the NRC staff and decided there might
be a need to consider evacuation.
Kennedy telephoned Hendrie at TMI and told him the three NRC
Commissioners thought Governor Thornburgh should advise a
precautionary evacuation within 2 miles of the plant, unless experts
on-site had better technical information than that available in
Bethesda.119 Hendrie assured Kennedy that the free hydrogen inside
the reactor would capture any oxygen generated and that no problem
existed.
In midafternoon, new measurements showed the large bubble in the
reactor was diminishing. The gases still existed, but they were
distributed throughout the system in smaller bubbles that made
eliminating the predominantly hydrogen mixture easier. Why this
occurred, no one knows. But it was not because of any intentional
manipulation by Met Ed or NRC engineers.
By late Sunday afternoon, NRC -- which was responsible for the concern
that the bubble might explode "- knew there was no danger of a blast
and that the bubble appeared to be diminishing. It was good news, but
good news unshared with the public. Throughout Sunday, the NRC made no
announcement that it had erred in its calculations or that no threat
of an explosion existed. Governor Thornburgh was not told of the NRC
miscalculation either. Nor did the NRC reveal the bubble was
disappearing that day, partly because the NRC experts themselves were
not absolutely certain.
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