ML19262A447
| ML19262A447 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/21/1972 |
| From: | Brown R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML19262A446 | List: |
| References | |
| REF-QA-99900012 NUDOCS 7910290791 | |
| Download: ML19262A447 (7) | |
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VENDOR INSPECTION REPORT 9
RO Report No.: 999-12/72-01 V?ndor: Din-nnd Power Specialty Corporation
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Type of Vendor:
Specialty Fabricator Type of Inspection: Announced Vendor
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Components Inspected For:
Licensee:. Metropolitan Edison Co.
Facility:
Three Mile Island 1 and 2 Docket No.: 50-289 and 50-320 1
Dates of ' Inspection: August 22, 1972
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,'j Dates of Previcus Inspection:
None 7 l~r,//7 p l
w Principal Inspector:
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Ross L. Brown, Reactor inspector Date Accompanying Irspector(s):
None s,
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i Licensee Representative (s):Mr. J. Kunkel, Project Engineer 1
i Reviewed By:
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L. M. 'Ioward, Chief, Reactor Construction Br.
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Proprietary Infor nation:
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SECTION I Enforcement Action None Licensee Action on Previously Identified Enforcement Matters s
Not inspected f
Unresolved Items None
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Status of Previousiv Reported Unresolved Items Not inspected Design Changes
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Reduction of wall thickness of some tubes.
(Section II, Parat.aph 2)
Unusual Occurrences None Persons Contacted i
Diamond Power Specialtv Corocration (DPSC)
Mr. D. V. Oetjen, General Manager, Nuclear Operations Mr. R. C. Scamehorn, Materials Manager Mr. P. H. Schlereth, Quality Assurance Manager Mr. G. J. Echelbarger, Manager, Special Task Force Mr. W. F. Ziegler, Contract Engineer Mr. C. L. Hogle, NDT, Examiner 3abcock & Wilcox (B&W)
Mr. T. O. Johnson, Supervisor, Licensing Mr. C. M. Fletcher, Quality Assurance Representative u.
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I General Public Utility (GPU)
Mr. J. Kunkel, Project Engineer All persons attended the management interview.
Management Interview At the conclusion of the inspection, the inspector discussed the follow-ing items with those in attendance.
A.
DPSC management stated that all motor tube extensions fabricated from Sandvik material will be ultrasonic, examined by a three step exam-4 ination to evaluate discontinuity depth in accordance with the Topical Report BAW - 10047, plus a wall thickness survey.
B.
All motor tube extensions supplied to Metropolitan Edison Company (Met Ed) will be free of " hot tear" discontinuities.
1.
Some extensions may be Laternally honed to remove the discontinui-(]}
ties, thus reducing the minimum wall thickness below the drawing requirements of 0.314 inch, but not below 0.287 inch. A new Code (N2) Data Report will be issued for these tubes, t
l 2.
The motor tube extensions supplied to Met Ed only, will be visually examined by television monitor at 4 times magnification.
4 3.
Het Ed will receive the following quality control data from DPSC.
(a) Thickness report and temperature rating.
(b) Certificate of Conformance, for all examinations performed.
(c) Material Certification, where applicable.
(d) Revised Code (N2) Data Report, where applicable.
C.
Other raw quality data will be maintained by DPSC.
D.
It is not enticipated that Med Ed (TMI-1) will require any motor tube extensions to be replaced as a result of rework.
The remaining motor tube extensions have not been completely inspected and evaluated to determine if replacement tubes are required.
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E.
Motor tube extensions supplied to other facility companies (Para;raph II-1) will be accepted without any further work if the depth of the discon-tinuity (ies) does not exceed five per cent of the nominal wall thick-ness (0.0165 inch) of the finished tube.
1.
Tubes with discontinuities exceeding five per cent will be inter-
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nally honed to the acceptable discontinuity depth of five per cent, but not necessarily removing the entire discontinuity.
4 2.
The wall thickness will not be reduced to less than 0.287 inch.
F.
Replacement tube extensions will be examined in accordance with the following original quality acceptance requirements :
1.
Ultrasonic examine tubes by two direction circumferential shear wave.
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2.
Assembly welds will be 100% examined by radiography and liquid penetrant.
G.
Fabrication of motor tube extensions that may require replacement
(^T tubes, will be provided by either Royal Industrics or Babcock & Wilcox, N_/
Barberton, Ohio.
H.
All tubes that have been reworked by internal honing er replacement will be hydrostatic tested at 3125 psig.
I.
All internally honed tube extensions will be ultrasonic examined by a three step examination and wall thickness survey as performed dur-ing the evaluation.
J.
DPSC has Code Stamp Authority "N" No. 245 and "NPT" No. 246 dated June 20, 1972, for Classes 1, 2, 3, and MC fabrications.
K.
DPSC nondestructive testing personnel are level II and III examiners quaJified in accordance with applicable supplement to SNT-TC-1A.
L.
DPSC has permanently assigned quality control representative in the Royal Industries plant.
M.
Welding procedures and welders used for this rework will be qualified in accordance with ASME Section IX.
N.
The nondestructive testing (UT) procedures were reviewed and approved by Babcock & Wilcox, (NPGD) Lynchburg.
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DPSC uses a shop traveler method to define the required shop operations and inspection. The completed and accepted inspece. ion operations are stamped by the responsible inspector.
P.
DPSC employs Hartford Steam Boiler Inspection Agency as the Code Inspection Agency.
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SECTION II Additional Subjects Inspected, Not Identified In Section I, Where No De-ficiencies Or Unresolved Items Were Found 1.
General I
a.
DPSC motor tube extensions for the following plants contain Sandvik supplied tubes: Oconce I and II, Three Mile Island I and II, Arkansas Nuclear I, Crystal River III, and Rancho Seco.
l b.
Reviewed the following procedures for conformance with the Babcock &
Wilcox, Topical Report BAW - 10047, dated June 1972:
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(1) Ultrasonic Immersion Test Procedure for Motor Tube Extensions.
i (2) Ultrasonic Test Procedure for Contact Evaluation of Motor Tube Extensions.
(3) Ultrasonic Test Procedure for Contact Testing of Motor Tube Extensions.
O (4) Wall Thickness Testing of CRDM Motor Tube Extensions.
c.
Observation of the following operations to assure conformance with the applicable approved procedures:
(1) Calibration of the ultrasonic instruments.
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(a)
Immersion circumferential and axial shear.
(b) Contact shear.
8 (c) Wall thickness survey.
(2)
Immersion scanning of two available tube extensions.
(3)
Contact shear evaluation of discontinuities.
d.
Reviewed selected records of the three step ultrasonic examination and wall thickness survey.
(1)
I==ersion scan report locating dimensionally reportable discontinuities.
(2)
Contact shear evaluation defining the location, size, and amplitude of the discontinuities, m
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6-(3) Wall thickness survey results taken at six inch intervals along the leigth of the tube and eight stations at each it.terval.
(4) Logbook records of survey instrument settings for each motor tube.
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Subjects Discussed in Section I i
2.
Reduction of Wall Thickness of Some Tubes In accordance with the B&W, Topical Report BAW - 10047, " Study of Discontinuities in Coatrol Rod Drive Motor Tube Extensions",
some of the motor tube extensions (number unknown at this time) will have the wall thickness reduced below the dra'iing require-ments of 0.314 inch, but not below 0.287 inch.
The Topical Report justifies this thinner wall.
A revised Code Data Report will be issued for the thinner walled tubes.
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