IR 05000320/1974007
| ML19220C268 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 11/09/1974 |
| From: | Folsom S, Heishman R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML19220C266 | List: |
| References | |
| 50-320-74-07, 50-320-74-7, NUDOCS 7904300115 | |
| Download: ML19220C268 (7) | |
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(Oct 7 's ) (Rev)
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U.S. ATO 11C E' ERGY CO:'.'11SS10N b
DIRECTO:L\\TT. OF RECM.iTORY OPEP* TIC::S
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Docket Nc: 5_j-320 50-370 74-07
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RO 1..<pection Report l
Licensee: _
htCnclitan_Edl. son.Cc=pany _
_ License ::o:_ g ys_ff
Priority:
Box 542
.1 Reading, Pennsylvania 19603 _
_ Category: L
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Island 2)feguards Middletown, Dauphin Co.. Pa. (Three Mile Group:
Locatica:
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Type of Licensec:
Special, Announced Type of Inspcetion:
October 22-23, 1974 j
Dates of Inspectica:
September 24-26, 1974 I
Dates of Previous Inspection:
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rolsos,TeactUr Inspector
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None
Ac cempanying Inspectors:
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None Otlier Accomptinying Personnel:
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Reviewed Ry:
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Date R. F. licishnan, Senior Reactor Inspector d
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SUMMARY OF FINDINGS Enforce =ent Action None Licensee Action on Previcusly Identified Enforcenent Matters Not inspected Design Changes The licensee is considering changes in tendon diaceter and wedge design in the containment prestressing syste=.
(Details, Paragraph 3)
Unusual Occurrences None identified i
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l Other Sienificant Findines
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Current Findings l
1.
The licensee was notified by the vendor of a possible generic i
deficiency in the E=ergency Power Diesel generator.
j The licensee consicered the =atter reportabic per 10 CFR 50.55(c).
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Thi* item is unresolved.
(Details, Paragraph 2)
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2.
The prototype grouting of a 170 ft, vertical containment tendon i
was ce=pleted during the inspection. Detailed information on
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the prnprietary greut was not available at the site. This
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ite: is unresolved.
(Details, Paragraph 4)
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3.
The licensee is considering revisions in the containment
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tendon wedges and wire strand dia=cter. This =atter is un-resolved.
(Detalls, Paragraph 3)
4.
Tests of the containment concrete in the areas where the te -
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porary crane supports were e= bedded showed an average coa-pressive strength of 6500 psi (5000 psi design).
(Details, Paragraph 5)
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l Status of Previously Reported Unresolved Items
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Not inspected
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-2-Manacement Interview The management interview was held at the site on October 23, 1974, with the following personnel in attendance:
General Public Utilities Service Co=cany Mr. W. T. Gunn, Site Manager Mr. R. W. Heward, J r., Proj ect Manager Mr. G. L. Kopp, Quality Assurance Specialist Mr. M. J. Stromberg, Site Quality Assurance Auditor Mr. J. E. Wright, Site Quality Assurance Manager
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Mr. J. H. Wright, Resident Civil Engineer Burns & Roe Mr. G. T. Harper, Field Project Manager The following was discussed:
1.
The inspector stated that he had observed the prototype grcuting of a contain=ent test tendon during the inspection and had identified no deficiencies. He stated that the information requested by the inspector which described the Sika Mix 122 Grout Aid PT admixture
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would be available at the site prior te th, actual use of this grout in a contain ent tendon. The licensee acknowledged this
t information.
(Details, Pcragrach '.)
2.
The inspector referred to tha licensee's proposed changes in the containment tendon wire diameter, and tensioning wedge design, which had been discussed at the licensee's meeting with the Directorate of Licensing on October 21, 1974. The inspector re-quested notification prior to any vendor testing of tendons or
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vedges in which the licensee expected to participate. The licensee agreed to prcvide this notification, and stated that the proposed tests would be conducted in the r. ext two months at the vendor's plant 1. Wilkes Barre, Pennsylvania.
(Details, Paragraph 3)
3.
The inspector stated that he had observed the Swiss Hammer testing of concrete in the arcas where the temporary crane supports were embedded. The 30 readings taken indicated concrece strength in excess of design. The licensee acknowledged this information.
The embedsent of the temporary crane support-in the contain= ant structure concrete remains unresolved.
(Details, Paragraph 5)
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DETAILS
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Persons Contacted General Public Utilitics Service Concany Mr. D. Boyea, Assistant Engineer, Civil Mr. L. Garibinan, Engineer Mr. W. T. Gunn, Site Mcnager Mr. R. W. Heward, Jr., Project Manager Mr. G. L. Kopp, Quality Assurance Specialist Mr. S. Levin, Proj ect Engineer, Unit 1 Mr. P. Levine, Quality Assurance Engineer Mr. D. Perry, Quality Assurance Engineer Mr. M. J. Strceberg, Site Quality Assurance Auditor Mr. J. E. Wright, Site Quality Assurance Manager
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Mr. J. H. Wright, Resident Civil Engir.eer Burns & Roe Mr. E. Debbas, Supervising Structural Engineer
l Mr. G. T. Harper, Field Project Manager Mr. M. Giannini, Lead Liaison Structural Engineer Master Builders i
Mr. J. C. King, Assistant Director, Floor and Grouting Nopco, Diamond Shamrock
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Mr. D. Suvala, Technical Representative
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Schupack Associates
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Mr. M. Schupack, President
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Sik a Chemical Cornoration
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Mr. R. J. Schutz, Vice President, Research and Development
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Babcock and Wilco:
Mr. C. R. Gish, Site Manager
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Stressteci Coccany Mr. R. Bonomo, Manager Plant Operations Mr. W. C. Rogers, Manager, Field Operations Mr. F. Roginski, Assistant Manager, Plant Operations Mr. F. Selinski, Plant Superintendent
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Mr. M. G. Suares, Vice President
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United Encineers and Constructors Mr. V. E. Cichocki, Quality Assurance / Quality Control Superintendent
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l Mr. R. Delarm, Structural Superintendent Mr. J. Gilley, Quality Control Engineer Field Supervisor, Quality Control Mr. D. C. Lamb er t,
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Mr. F. F. Long, Quality Control Engineer, Civil i
Mr. R. H. Mason, Project Engineer
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Mr. W. Tinlin, Construction Supervisor
Diesel Generators - Possible Generic Deficiency 2.
j The licensee's Project Engineer notified the inspector ca October 23,
974 that notification had been received from Fairbanks - Morse of
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possibly generic, discovered during testing of a Fairbanks-a defect, Morse Diesel Generator at another location. The equipnent was
similar to that furnished to Three Mile Island 2.
A wrist pin
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A Fairbanks - Morse failure had resulted from a cachining error.
representative is scheduled to examine the Three Mile Island 2
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Diesel units on October 29, 1974. The licensee considered the
This item is unresolved.
item reportable under 10 CFR 50.55(e).
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Tendon Tensioning System Desien Chances
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b The licensee is considering changes in the cc=ponents of the con-The tensioning wire size originally tainment tendon tensioning syctem.
is no longer available, and standard-sized d
p?anned for the containment q
from another vendor is expected to be used. The re-design of wi-the tensioning wedges is also being considered. The new wedges are
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expected to be tapered 7 degrees instead of the previous 10 degrees,
d the wedge grooves will be eliminated, and the wire-gripping wedges will have buttress threads instead of a "V" configuration.
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No decision had been reached in the proposed design change, but testing of the proposed design, employing 54 wire strands will be.
conducted within the next two conths at Stressteel's plant at Wilkes Barre, Pennsylvania. The inspector requested advance notification of any tests in which the licensee expected to participate. This item is unresolved.
4.
Prototype Tendon Grouting i
During the inspection the licensee conducted a full-scale prototype test of the tendon grouting material planned for use in the con-tainment tendon tensioning program.
A six-inch tendon sheath, 170 ft. in height,was secured to the side of the containment wall. The tendon strands were tensioned from one end to a total of 81 kips (1.5 k per strand), and grout
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was pumped into the full length of the tendon.
The grout test procedure, prepared by Burns and Roe " Procedure for Grouted Tendon Demonstration Test for 170 Ft. High Vertical Tendon",
Revision 2, October 22, 1974, was approved by the architect-engineer constructor and the licensee. The procedure specified equipment, materials, schedule, stressing, pumping, sampling, testing, and record keeping.
Participating in the test were representatives of the licensee, architect-engineer, and constructor, in addition to representatives of the vendors of the grout and tendon system and their consultants.
The grout pumping proceeded without incident. None of the grout vented from the top of the tendon sheath appeared to exhibit bleeding.
Expansion uf the grout during setting was measured, and amounted
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to the anticipated 10 percent. Temperature readings of all com-ponents were taken during the test, and cube samples were prepared at the pump and at the vent discharge. After 30 days the 170 ft.
grouted tendon will be cut into 30 f t.
lengths, and the exposed grout examined and sampled by coring. The core samples will be strength tested. The inspector stated that he would examine the I
cut sections at that time. This item is unresolved.
5.
swiss Hammer Testing of containment concrete
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i The inspector observed the testing of concrete in the contain=ent area
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where the two temporary cranc support columns were embedded. A Swiss
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Hammer, Serial No. NA3-1552,was used in the test.
The test device had been calibrated on March 14, 1974. A total of 30 readings were taken. The concrete compressive strength as ceasured by the Swiss Ha= er averaged 6700 psi, and no readings were less than 5000 psi, the design strength of the concrete in that area. The embed =ent of the crane support colunns remains unresolved.
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