ML19249B662
| ML19249B662 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 05/30/1979 |
| From: | Clint Jones, Knop R, Schseibinz E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| Shared Package | |
| ML19249B654 | List: |
| References | |
| 50-456-79-06, 50-456-79-6, NUDOCS 7909040648 | |
| Download: ML19249B662 (6) | |
See also: IR 05000456/1979006
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U.S. SUCLEAR REGULATORY COMMISSION
OFFICE OF INSPECTION AND ENFORCEMENT
REGION III
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Report No. 50-456/79-06; 50-457/79-06
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Docket No. 50-456; 50-457
License No. CPPR-132; CPPR-133
Licensee:
Commonwealth Edison Company
Post 02fice Box 767
Chicago, IL 60690
Facility Name:
Braidwood Nuclear Power Station, Units 1 and 2
Inspection At:
Braidwood Site, Braidwood, IL
Inspection Conducted:
May 3, 1979
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Inspectors:
E. R. Schweibin'z
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Approved By:
R. C. Knop, Chiet
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Projecta Section
Inspection Summary
Inspection on May 3, 1979 (Report No. 50-456/79-06; 50-457/79-06)
Areas Inspected: Radiographic examination procedures for contain-
ment liner plate; and site tour. The inspec*. ion involved a total of
12 inspector-hours onsite by two NRC inspectors.
Results:
Of the two areas inspected, no items of noncompliance or
deviations were found in one area; one apparent deviaton was iden-
tified in one area (Deviation - Failure to use proper penetra-meter
for radiography of containment liner plate - Paragraph 1).
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DETAILS
Persons Contacted
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Commonwealth Edison Company (CECO)
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- R.
Cosaro, Project Superintendent
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J. A. Homoly, Quality Assurance Supervisor
'tJ.
T. Merwin, Lead Mechanical Engineer
&C. Mennecke, Lead Electrical Engineer
- H. T. Cobbs, Quality Assurance Engineer
The inspectors also contacted and interviewed other licensee and
contractor personnel, including craftsman,QA/QC, technical and
engineering staff members.
- Denotes those attending the exit meeting.
Functional or Program Areas Inspected
Details of functional or program areas inspected are documented as
follows.
1.
Radiographic Examination Procedures for Containment Liner Plate
a.
The following documentation was reviewed:
(1) Braidwood PSAR Paragraph 3.8.2.6.7, Nondestructive
Examination of Liner Plate Welds, which states, in
part, "All nondestructive examination will be per-
formed by personnel cualified in accordance with
Section II of the ASME B&PV Code and all examination
procedures will be in accordance with Appendix X to
Section III and Section V of the ASME B&PV Code."
(2) Appendix X to Section III of the 1971 edition of the
ASME Boiler and Pressure Vessel Code, Nondestructive
Examination Metbods for Metal Containment Vessels.
(a) Parar
,h X 3325, Penetrameters, Subparagraph
X-332a.1, Material, Size and Shape, states, in
part, "The maximum thickness of the penetrameter
shall be as shown in Table X-3325.1-1."
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(b) Table X-3325.1-1, Standard Penetrameter Sizes,
indicates that "For a weld thickness between the
range of over 1/4" through 3/8" the thickness of
, . , .
the penetrameter on the source side shall be
0.0075" and the designati a on the penetrameter
shall be No.
7."
(c) Subsubarticle X-3330, Technique for Radiographic
Examination of Welded Joints, Paragraph X-3332,
Required Sensitivity of Radiographic Technique,
states " Radiography shall be performed with a
technique which will have sufficient sensitivity
to indicate the features in X-3334.5 of a pene-
trameter of the thickness specified for the
thickness of the weld being examined, as shown
in Table X-3325.1-1."
(d) Subparagraph X-3334.5, Images Which Shall Appear
on Radiographs, (a) "The images of the identifying
numbers of the penetrameter outline and of the
2T hole are all essential indexes of image
quality on the radiograph and they shall appear
on the radiograph, except that for penetrameters
5, 7, and 10, the slit shall appear clearly, and
hole need not appear."
(3) Sargent and Lundy Specification No. L-2725, Steel
Liner Work for Reactor Containment St.uctures Byron /
Braidwood Nuclear Generating Station - Units 1 and 2,
Division 2-602 subparagtaph 2-602.6 states that,
" Examination and testing of welds for steel liner
work shall be in accordance with the requirements of
Standard Specification Form STR1, with the following
modifications: . . .Pa ragraphs 6.1.1,
...as
indicated
below, shall be used in lieu of the same parts as
speci fied in Standard Specification Form STRI ."
6.1.1
Contractors shall perform all radiographic
examination in accordance with the require-
ments of Article 3, ASME Section V, except
that:
(a)
Intensifying screens shall be used,
(b) Types 1 and 2 film shall be used,
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l (c) The minimum density for single viewing
shall be 1.5.
(4) Chicago Bridge and Iron (CB&I) Procedure No.
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RTP-(74-2270/71)-15L, Rev. 5 approved by Sargent and
Lundy by a letter dated August 16, 1976, titled " Spot
Radiographic Examination Procedure for Welds, for
Liners."
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(a) Section 3.0, References;
Subparagraph 3.1, 1971 ASME Boiler and Pressure
Vessel Code,Section V, T-170 of Article 1,
T-222.2 and T-222.3 of Article 2, Article 3 and
SE-142 of Article 22 with Summer 1973 addenda.
(b) Section 4.8, Penetrameter:
The type, size and
shape of penetrameter shall be in accordance
with SE-142, Fig.
1.
(c) Section 7.1.A, "The images of the identifying
numbers, the penetrameter outline, and of the
essential hole of Table T-320 are all essential
indexes of image quality on the radiograph, and
they shall appear on the radiograph.
(d) Section 7.1.B, "The film density through the
weld metal shall be 1.5 minimum for single
viewing and 1.8 minimum for composite viewing of
double film exposures."
(5) ASME Boiler and Pressure Vessel Code,Section V,
1971
edition, Article 3, Radiographic Examination, Table
T-320, Thickness, Penetrameter Designations, and
Essential Holes, requires that ior a single wall
material thickness of the range of over 1/4" through
3/8" tht the source side penetrameter shall be a
size 12 with an essential hole of 4T.
Note: A size 12 penetrameter has a thickness of
0.012".
b.
Evaluation of the Above Documents
The RIII inspector requested the licensee to explain the
apparent deviation between:
(1) The commitment in the
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PSAR to have 311 nondestructive examination procedures in
accordance with Appendix X to Section III of the ASME
Boiler and Pressure Vessel Code, which requires the use of
a 0.0075" thick penetrameter for a weld thickness over
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1/4" through 3/8" (the liner plate is 1/4" thick) and; (2)
The requirement of CB&I Procedure No. RTP-(74-2270/71)-15L
to determine the thickness of the penetrameter in accordance
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with Table T-320 which requires a penetrameter 0.012"
thick for the same material thickness.
The RIII inspector explained that he had identified an
identical deviation at Marble Hill during the previous
month.
Sargent and Lundy (S&L) Specification No. L-2725
references Article 3 of Section V instead of Appendix X to
Section III of the ASME Boiler acd Pressure Vessel Code.
It should be noted at this time, that the No. 12 penetrameter
called for in Article 3 of Section V is 60*s thicker than
the No. 7 penetrameter as called for in Appendix X to
Section III.
The licensee indicated that it would contact S&L to explain
why the thicker penetrameter was allowed to be used in
lieu of the commitment in the PSAR.
This item is a deviation from a commitment in the PSAR.
(456/79-06-01; 457/79-06-01)
Note: The RIII inspector recognizes that Section III of
the ASME Boiler and Pressure Vessel Code does not require
that the coctainment liner plate seam welds be radiographed.
However, Regulatory Guide 1.19 does require that these
seam welds be spot radiographed.
Braidwood PSAR Section
1.7 commits to Regulatory Guide 1.19, August 11, 1972,
Nondestructive Examination of Primary Containment Liner
Regulatory Guide 1.19:
Paragraph C.1, Nondestructive
Examination of Liner Seam Welds, Subparagraph C.I.a
requires that welds be examined radiographically in
accordance with the techniques prescribed in Section V.
(ASME B&PV Code); Subparagraph 7.a, Containment Liner Seam
Welds Examined by Radiography, states, "Where a spot in
the seam weld is judged acceptable in accordance with the
referecced standards of NE-5120 of Section III of the ASME
B&PV Code, the entire weld test unit represented by this
spot radiograph is considered acceptable."
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Subarticle NE-5120, Examination Requirements of Welded
Joints for Vessels, of Section III of the 1971 Edition of
the ASME B&PV Code states, " Examination in accordance with
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the requirements of Section VIII, Division 1 of this Code
shall be made of welded joints for vessels as follows: (a)
Welded joints of Categories A and B as defined in
NB-3351 shall be radicgraphed in accordance with UW-51."
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Subparagraph NB-3351.1 defines Category A welded joints as
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longitudinal welded joints within the main shell.
Subpara-
graph NB-3351.2 defines Category B welded joints as circum-
ferential welded joints within the main shell.
UW-51 to Section VIII, Division 1 of the ASME Boiler and
Pressure Vessel Code, Table UV-51, Standard Penetrameter
Sizes, requires that a penetrameter for weld thickness
range of over 1/4" through 3/8" be of a thickness of
0.0075" and designated a No. 7 penetrameter.
The liner
plate is 1/4" thick.
The commitment in the PSAR Paragraph
3.8.2.6.7 requires that all examination procedures will be
in accordance with Appendix X to Section III and Section V
of the ASME Boiler and Pressure Vessel Code.
Appendix X
to Section III and Article 2 of Section V are acceptable
methods of meeting the requirements of Regulatory Guide
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1.19, since their examination requirements are equivalent.
2.
Site Tour
An extensive site tour was conducted to further inform the new
project inspector of previous activities at the site.
Exit Meeting
The inspectors met with the licensee representatives (denoted in the
Persons Contacted paragraph) at the conclusion of the inspection on
May 3, 1979. The inspectors summarized the scope and findings of
the inspection including the one apparent deviation, identified in
paragraph No. 1 of the Details section of this report. The licensee
acknowledged the findings. The licensee representatives were informed
that Mr. E. R. Schweibinz is now the newly assigned Project Inspector
for the Braidwood facilities.
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