ML19220B063
| ML19220B063 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 08/01/1974 |
| From: | Folsom S, Heishman R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML19220B062 | List: |
| References | |
| 50-320-74-05, 50-320-74-5, NUDOCS 7904250255 | |
| Download: ML19220B063 (7) | |
See also: IR 05000320/1974005
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U. S. ATOMIC ENERGY CO.MISSICN
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DIRECTORATE OF REGULATORY OPERATIONS
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'50-320/74-05
Docket No.:
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RO Inspecticn Reporr. No.:
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etr p litan Edison Cenpany
License No.: CPPR-
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Licensee:
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P.O. Box 542
Prierity:
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Reading, Pennsylvania 19603
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Category:
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Middletevn, Dauphin County, Pennsylvania (Three Mile Island 2)
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PWR,871 MWe (35W)
Type of Licensee:
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heofInspection: Special, Announced
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Dates of Ins' ectica: July 9 and 10,1974
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June 27 and 28, 1974
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Dates of Previcus Inspectien:
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Principal Inspector:
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. Seth A. Folsom, Reactor Inspector
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Acconpanying Inspectors:
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Otbrr Accenpanying Persennel.
J_. 3. Henderson, RO:HQ
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Reviewed By:
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R. F. Heishaan, Senior Reacter Ins?ector
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SUW.ARY OF FINDINGS
Enforcenent Action
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Licensee Action on Previousiv Identified Enforcement Matters
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inspected
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Desien Changes
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Polar crane supports incorporated into contain=ent structure ccncrete.
(Details', Paragraph 2)
Unusual Occurrences
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None identified
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Other Significant Findines
None identified
Managenent Interview
The =anage=ent interview was held at the site on July 10, 1974 with
the following personnel in attendance:
General Puolic Utilities Service Cc=cany
Mr. B. G. Avers, Manager, Quality Assurance
Mr. R. W. Heward, Jr., Project Manager
Mr. M. J. Stro= berg, Site QA Auditor
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Mr. J. E. Wright, Quality Assurance Manager
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Mr. J. H. Wright, Civil Resident Engineer
United Eneineers and Conset
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Mr. V. E. Cichocki, QA/C
r.inating Superintendent
Mr. R. H. Mason, Jr., Job
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Burns & 2.oe
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Mr. W. R. Cobean, Jr
Site Proj ect Manager
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Mr. M. Giannini, Civil /Stru:tural Liaison Engineer
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The following was discussed:
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The inspector stated that he had examined the details of the partial
embed =ent of the tt.=porary polar crane in the permanent containment
structure concrete.
This included the available documentr* ion relating
to the embedment operation.
Directorate of Licensing for review.This catter will be referred to the
The licensee acknowledged this
infor=ation.
(Details, Paragraph 2.)
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DETAILS
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Persons Contacted
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General Public Utilities Service Comoany
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Mr. 3. G. Avers, Manager, Quality Assurance
Mr. R. W. Heward, Jr. , Proj ect Manager
Mr. M. J. Stromberg, Site QA Auditor
Mr. J. E. Wright, Quality Assurance Manager
Mr. J. H. Wright, Cieil Resident Engineer
]Inited Engineers and Constructors
Mr. V. E. Cichocki, QA/QC Coordinating Superintendent
Mr. R. H. Mason, Jr. Job Engineer
Burns & Pr_e_
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Mt. W. P. Cobean, Jr. , Site Proj ect Manager
Mr. M. I,iannini, Civil / Structural T.iaison Engineer
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Embedeent of Polar Suenorts in Containment Structure
Permanent Concrete
Refer to Mr. J. 3. Henderson's attached report.
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Details
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Enbedrent of temporar" supports in per=anent concrete structure.
Prepared by:
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. Henderson, se . .or Mechanical Engineer
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Te mical Assiscance Branch
D rectorate of Regulatory Operations
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Dates of Inspection:
July 9-10, 1974
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Revieued by:
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K. V. Seyfrit, Chicf f
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Technical Assistance Branch
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Directorate of Regulatory Cperations
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Persons Contacted
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B. G. Avers, Quality Assurance Manager, General Public Utilities
Service Co=pany (GPUSC)
James H. Wright, Civil Resident Engineer, CPUSC
Matthew Giannini, Site Liason Structural Engineer, Burns & Roe (3&R)
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General
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This part of *he inspection was cenducted to examine the documentation
of the deci.; ion to permanent]y e= bed in the structural concrete of the
refueling canal, certain tenporary structural steel supports which had
been installed to support t.he containment building polar crane pending
completion of the contain=ent building. The inspection also included
ernmination of records of work perfornance c.nd li::liced exnmination of
work in. progress.
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Background
During the early stages of the project, as part of the construction
sequence planning, the fact was established that rF najor equipment
o be installed inside contain=ent would be delivered early in the
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construction sequence.
These =ajor ele =ents consis ted of' the reactor
vessel, the two steam generators, and the contain=ent building crane
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bridge and trolley. Early installation of this equip =ent would eliminate
the necessity to provide a large construction opening in the wall of the
contain=ent building.
Based on this, agree =ent was reached between the
owner, the AE (B5R), and the coastructor, to schedule early co=pletion
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of the per=anent foundations for the reactor vessel and the steam
generators, and to provide a te=porary structure to support the crane
girder approxi=ately in its final position, until the contain=ent
building had reached a degree of ce=pletion which would permit support
of the crane on its per=anent support system. To i=ple=ent this latter
decision, B&R issued, on December 19, 1963, Drawing 4143, describing a
support systes consisting of four lattice steel towers, 5 feet square by
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about 136 feet tall, spaced 28 fee- on centers one way,108 feet on
centers the other way.
The towerr were founded on the contain=en.
building bottos floor and extended approxicately to the height of the
finished building wall.
They were stiffened by structural angle "I"
bracing in the narrow (28 foot) direction, and by re=ovable cable "I"
bracing in the long (108 foot) direction supplemented by re=ovable
horizontal trusse.s at the top.
The towers and end panel bracing were
2 teted prior to installation of the reactor vessel and steam generators,
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tne bracing in the side panels was lef t out for placesent access until
those vessels had been installed.
Ev'-#aation of ccustruction photographs
showed that the reactor vessel was installed on March 29,1972 (the two
steam generators had already been placed) and that by May 1972, the crane
had been installed on the te=porary supports.
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E= bed =ent of Tcwers
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In the original construction sequence, the plan was to delay installation
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of structural concrete internal to the contn'nrant building until af ter
the contain=ent building had been completed ta a point where the crane
could be positioned on its per=anent supports, and the ta=porary supports
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could be re=oved.
However, shortly af ter the towers were installed, this
plan was =od.ified, and the decision was reached to e= bed two towers in
the structural concrete of the fuel handling pool walls, from the con-
rain =ent floor to the operating floor, a height of 65 feet. This decision
la docu=ented in Engineering Deviation Request (EDR) 1011, approved
March 15, 1972, which states in psrt
."The two north towers shall
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re=ain in place and beccce e= bedded in the fuel pool vall . .
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decision was stated during the inspection to have been =ade in the interest
of constructi:n schedulir.g. Delay of fuel pool construction until af ter
the towers had been re=cved would have resulted in a delay and increased
cost to the overall corstruction schedule.
The presence of the tower steel
required =odification of the concrete reinforcing steel arrange =ent. These
=odifications were de. fined and approved by EDR's 11027 c.d J1159.
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Work perfor=ance
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The 5 foot horizontal di=ension of each tower is slightly grer.cer than
the fuel pool wall thickness.
Thus the 6 x 6 x
inch cornr angles
and the 2h x 2h x 3/16 inch lacing angles were only part'.y e= bedded in
the concrete. Depending on the local conditions, th ' .or s were either
fitted to the angles and concrete was placed solidly, or plastic foa=
blocks were ecured to the for=s to exclude concrete fro = the vicinity
of the angle e= bed =ents..
In either case, the specification required.
that after the for=s were re=oved, any tower steel within 2 inches of
the concrete surface. was to be cut away, and the concrete was to be
locally repaired to provide a =dni=t=1'of 2 inches of concrete cover ove -
tower steel which rembed e= bedded.
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This work was in progress at the ti=e of the inspection. Were the
concrete was being re=oved locally to provide access to cut back the
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ededded steel, there was evidence that the original concrete was
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sound and well placed
In the areas eyn%a , where the steel had
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been excised but the excavatien had not been refilled. The steel was
in all areas re=oved at least 2 inche~s deep.
Since the repair areas
were generally several inches vidc and several fmet long, concrete
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replace =ent was by for=ing a-d place =ent of fluid concrete. Place =ent
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vindoes' and inspection vindows were observed to be located at appropriate
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intervals.
Ey r % atien of replace =ent concrete where for=s had been
recently re.mved indicated good consolidation and bond to adjacent
concrete.
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C$e area of particular interest was on the interior sides of the fuel
pool wall where re= oval of tower steel to a depth of several inches
was required in order to e= bed anchorages for the fuel pool liner.
This work had been co::pleted at the ti=e of the inspection. It appeared
to have been perfor=ed acceptably.
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