ML20080D183
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The Board of Directors
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EN FROM:
W. J. Cahill, Jr.
J Dr. Murrill has asked me to provide you with a brief report on the crane accident which happened at Riv.er Bend about 7 o' clock on Friday evening, March 25, 1983.
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The accident occurred while the Lampson Transi-Lift Crane
- was lifting a 400-ton form assembly for the containment shield building roof.
The form
- consisted of sh:et metal decking and reinforcing bar supported by structural steel ribs and circumferential members. The form had been assembled on the ground and was being lif ted to the top of the cylindrical containment shield bui,lding*, af ter which concrete would have been poured to form the shield roof.
The day before, the li-inch thick
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steel containment building dome had been successfully lifted and placed on the containment building by the same crane without mishap or frob[em. l The same procedures /, -..,
1 were being 'followed with the Friday night lift as on the previous night. Af te'r normal working hours, No av.oid.unnccessary numbers of people or traffic in the area, the form was lifted' to abobd feet above its assembly area i
1 and was about to be moved to position for liftin,g and placement on the shield building.
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At that point, people heard metallic n,oises andfobs,ervej water (rain water collected in upper parts of tfie ' crane) falling./ The crar[e nlastJuckled, the shield form fell to the ground and the crane collapseb.
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Fortunately, no one was seriously ' njured and only vehi
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,i were damaged.
Except for the phield form, no permanent structures or equipment were s
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damaged.
The Transi-Lift boom, mast' and strut were severely damaged but the carbodies and hoisting machinery do not appe/ar to have serious damage.
W The cause of the accident is undetermined.
It could be due to a structural or mechanical failure in the crane, to misoperation, to failure of the cribbed roadway, or to wind interaction or other unknown cause.
Stone & Webster, Lampson, and the insurance companies have experts studying all of these possibilities.
GSU bcs retained Mr. B. DeBenedictis, a noted expert in crane and rigging safety, who has investigated many major crane failures.
He will observe and participate in the investigations, advise us as to their adequacy and coment on their conclusions.
All ir.vestigators are cooperating and sharing factual information.
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[gghfB3-498 PDR
The damaged shield form cost $XXX and the crane is estimated to be worth about
$XXX.
This was a serious accident whose consequences could hav'e been much worse than the combined value of both crane and form.
It is therefore important to determine the cause and to correct any deficiencies which may be indicated. However, we fortunately are relatively unscathed.
The completion of the containment shield roof is not a critical path item and any delay in its completion will not affect the December,1985, service ' date.
Stone & Webster is studying the repair and salvage potential of the damaged form and is considering means of erecting repaired sections in place on top of the containment shield.
The accident investigation, cleanup of the wreckage and repair plans are being expedited vigorously to avoid impediment to normal cont.truction work through physical obstruction and through negative norale.
A report on the accident will be submitted on completion of the investigations which are estimated to be finished by X,1983.
A separate report summarizing the repair plan and schedule will be submitted by X, 1983.
W. J. CAHILL, JR.
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INTEROFFICE CORRESPONDENCE C/AtMi sc
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&cP DAM May 2 f., 148:'
2 W E j, J. ['E L'. Chin / L. Fuze yo GOV C. liirpint Pk. 19 Prorress Frocedures t
3,gm As di rect ed by UEC (menc. SCE #141!.- copy ottached), please institute the following progressing procedures ef fective 2. lune 82 for work coepicted fror 21. Mav on.
Inescrintion of act ivit ies to be procressed Authorized st ers of propress La r n I.a rc :
Spools. Valves A Enec. Itoms i:andling (to general location) 0 - ' 10*.
E rec t ion te design elevat ion 10*. -
60*.
Final fit up (to first veld are) 60; - 901 Tinal inspection and walk thru 901 - 100; Lsree horc:
11an ge rs handling (to ecneral location) 0 -
10; Erect (fit and tack)*
?;e Step' 10% - 50%
complete velding4 Sc Step 5 0* - 90:
Tint 1 inspection and walk thru (including any at tcchtents) 90% - 100'.
90'. - 100%
For stc;s indicated with an asterisk and for thosc hangers budgeted in the c):cces of 403 manhours, the rerponsibic supervisor shall be allowed to progress fro: 101 - 90*. in st eps that reflect actual ccnstruction cceplete (i.e. 5,10%,
25% etc. increments).
M Ig g erc: Ecids "cid in progress (first cre) 0 -
10%
kild c omplete (except GA documentation i
':0E etc. and stress relieving) 10% -- 65%
Stress relieving corplete (except QA doeurentation) 65% - 90%
i Vci d t o: pi c t e (cycept QA documentation NDE etc.)
10 - 90%
Cc pic te wcid (QA docutt nt ed) 90*i - 100%
j (Step for OA dracumentation) s t-l% v t
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- 45 Hay 28, 1982 tc 11. Chan / L. Puzo s <.n ct.
Pkt. 19 Prorresr. Procedurer.
? of 2 e a.5 m.
$ mall bore Piping 11andle mat erial 0 - ^ 10*,
- In progress thru completion 101 - 902 (in 101 inc rerentr.)
Final inspection and walk thru before turnover for hydro 90* - 1001 Prorress to be taken in 10*. increrents at the discretion of the P-H supervisor and it. r.uch a n.anncr that it r( flects an accurate percentare of the constroction cor.pleted.
All other activitiet. requirinr. propress will re r.ain unchanted.
If you have any ouestions,please call ext. 3179.
cc:
TMC Calder J. Corcoran C. Scannell E. !!oran L.
En t l e r.
R. Davis J. Mayne - UEC D. O'Kee fe - UEC CH/pgh t
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