ML20138L216
| ML20138L216 | |
| Person / Time | |
|---|---|
| Site: | San Onofre, 05000000 |
| Issue date: | 11/12/1982 |
| From: | Hernandez G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Foster J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML20138L184 | List: |
| References | |
| FOIA-85-249 NUDOCS 8512190195 | |
| Download: ML20138L216 (6) | |
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NB 4000-FABRICATION AND INSTALLATION REQUIREMENTS N B.4230-N B.4233 NB4230 FFITING AND ALIGNING NB4232 Masimum Offset of Aligned Sections *>Y fl y
g g,
f (a) Alignment of sections shall be such that the j
NB4231 Fitting and Aligning Methods maximum offset of the finished weld will not Le#
Ill Parts that are to bejoined by welding may be fitted, greater than the applicable amount listed in 1able i
aligned, and retained in position during the welding NB.42321, where s is the nominal thickness of the operation by the use of bars, jacks, chmps, tack thinner section at thejoint.
welds,or temporary attachments.
(b) Joints in sphericalvessels, joints withb ficads, and joints between cylindrical shells and hem.
J NB4231.1 Tsck Welds. Tack welds used to secure ispherical heads shall meet the requirementsin Table g
g alignment shall either be removed completely, when NB-42321 for longitudinaljoints.
i they have served their purpose, or their stopping and NB-4232.1 Fairing of Offsets. Any offset within the g
E starting ends shall be properly prepared by grinding
%l or other suitable means so that they may be allowable toIerance provided above shall be I.hred to b
satisfactorily incorporated into the final weld. Tack at least a 3 to I taper over the width of the fmished b
welds shall be made by qualified welders using weld or,if necessary,by addingadditionalweld metsi 3
qualified welding procedures. When tack welds are to beyond what would otherwise be the edge of the weld.
become part of the finished weld, they shall be In addition, offsets greater than those stated.in Table l],
visually examined and defective tack welds removed.
NB-42321 are acceptable provided the requirements of NB 3200 are met.
A NB4231.2 Temporary Attachments and Delt Re-g
[moial. Attachments whic's are welded to the com-NB4233, Alignment Requirements When 7
y ponent during construction but which are not Component Inside Surfaces Arc J'I incorporated into the final component, such as inaccessible l
alignment lugs or straps, tie straps, braces, preheat When the inside surfaces of comgmnents 4re J
equipment, postweld heat treatment equiomen_, are
- inaccessible for welding or fairingin accordan. e with t
1 permitted, provided the requirements of (a) through
.NB.4232.1, the inside diameters shall match.cach
,, s (h)below are met.
other within in.When the components cre aligned
,fW (a) De material is identified and is suitable for concentrically, a uniform mismatch of %in.around
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weldingbut need not be certified material.
the joint can result as shown in Fig. N B.42331 sk, (a).
(b) The material is compatible for welding to the flowever, other variables not associated with 11.;
f component material to which it is attached.
diameter of the component of ten resultin abpn'ments (c) The welding material is compatible with the that are offset rather than concentric. In these cases, (h
base material and is certified in accordance with NB.
the maximum misalignment at anj one pomt around p
2130; the joint shall not exceed W in., as shown m Fig. NB.
(d) He welder and welding procedure are qualified 42331 sk. (b). Should component tolerances such as I g
( h in accordance with Section IX and the additional diameter, wall thickness, out of roundners, result in requirementsof NB.4320.
inside diameter variations which do not meet these i
N (c) The immediate area around the temporary limits, the inside diameters shall be counterbored, y
attachment is marked in a suitable manner so that sized,or ground to produce a bore within these limits. 7 after removal the area can be identified until af ter it
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has been examined in accordance with (g)below.
h)
(/) T.ie temporary attachment is completely re-TABLE NB.42321 moved in accordance with the procedures of ND*
MAXIMUM ALLOWABLE OFFSET IN g
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FINAt. WELDED JOINTS in (g) After the temporary attachment has been '
l g removed, the marked area is examined by a magnetic.
o;,. won of.wam a
,p.
n Sadoa Na*
M particle or liquid penetrant method in accordance.
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with the requirements of Atticles 6 and 7 of Section V*
frJ and meets the acceptance standards of NB 5340 or 7 un io it2. nad.
1/4, J;
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f 0* 1t2 to 3/4. sad.
.t/ sin.i; e,'
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(h) The attachment weld or the area af ter removalw fM'*f2 :
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MAXIMUM SLOPE lA
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p 1/32 in. MAXIMUM UNIFORM MISMATCH BORE DIAMETER 11/32 in.
AROUND JOINT pgpg g g
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CONCENTRIC CENTERLlHES z
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COMPONENT (
JOINT
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(b) 0FFSET CENTERLlHES NOTE THE COMBINED INTERNAL AND EXTERNAL TRANSITION OF THICKNESS SHALL NOT EXCEED AN INCLUDED ANGLE OF 30* AT ANY POINT WITHIN 1% t OF THE LAND.
FIG. NB42331 BUTTWELD ALIGNMENT TOLERANCES AND ACCEPTABLE SLOPES FOR UNEOUAL l.D. AND O.D.WHEN INSIDE SURFACE IS INACCESSIBLE FOR WELDING OR FAIRING 166 ydil>$1sh38hIBsSL..dRdu.__
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TRANSIT /0NS ARE FOR val.VES, f/TTINQS, AND EQUIPMENT 2.
feQ n' ELD END PREPS SEF DRAWING 40048 OR 40049.
1 i = NOMINAL n'All TH/CKNESS.
4 4.
INTERIOR AND EXTERIOR TRANSITION ANGLES SHAll NOT BE i
l COM8INED 50 ACTO DECREASEMINIMUM RfoulRED W4ll THKKNESS.
- 6. THt'VALUE Of"iMINTIN NNICNtVEYOF THE NALI$/NS 13 APPUCA6Lf;
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AL[Ecs hasTON
.aur ia 9(nileb ${4 ales Menctic WASHINGTON, Ot. 33519 October 29, 1982 Mr. Carlton Kammerer, Director Office of Congressional Affairs Nuclear Regulatory Commission 1717 H Street, N.W.
Washington, D.C. 20555
Dear Mr. Kammerer,
The enclosed correspondence from the Community Energy Action Network and the article from the Los Angeles Times have brought to my attention a possible problem with welds at the San Onofre nuclear According to these sources, E. Earl power plant in California'.
Kent, a former quality control engineer with Bechtel Power Corpora-tion, has noted " thousands of substandard welds on 7 pe and elec-1 trical system supports" at both San Onofre and anot.ier plant in Mr. Kent alleges that if these welds fail, the pipe Michigan.
and conduits could bend and break, threatening the systems which cool the reactor and which carry radioactive water within the containment building.
The news article notes that the Nuclear Regulatory Commission is investigating these charges.
I trust that the investigation will be comprehensive and thorough and that the NRC will take,
any steps necessary to assure itself -- and the pubic -- of the safety of these nucicar plants.
It is essential that unit 2 of San Onofre, which the NRC has authorized to go to full power operation,and unit 3 which may reach that stage by year's end, be built according to the very highest safety str.ndards, even if a delay in full-power operation is necessary.
I would appreciate knowing the scope and progress of your investi-gation and receiving a copy of the final report when the inquiry is completed.
Since y,
Al anst n Enclosure e
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NOV 0 51982 Stunningham 4
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GL FILE L
D0 12440 l
OCA l
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The Honorable Alan Cranston Keppler.RIII w/inc j
l United States Senate l
Washington,D.C. 20510 t
r l
Dear Senator Cranston:
l 1
29,1982, to Carlton Kamerer.
This is in response to your letter of October i
t Office of Congressional Affairs, relating to allegations by Mr. E. Earl Kent l
conce,rning welding quality at the San Onofre nuclear power plant.
We first became aware of Mr. Kent's current allegations when our Region V office in Walnut Creek, California was contacted by a newspaper reporter on Direct contact was made that same day with Mr. Kent, and October 6, 1982.
a special inspection into his allegations was initiated by our Region V J
l office on October 12,1982.
i Our special inspection is nearing com:1stion, and has included an interview l
(71 hours8.217593e-4 days <br />0.0197 hours <br />1.173942e-4 weeks <br />2.70155e-5 months <br />) with Mr. Kent followed by sis accompaniment of Region V inspectors on a tour of the San Onofre site, to enhance our understanding of the nature and locations of substandard welds he has alleged to exist. We are making l
every effort to examine thoroughly Mr. Kent's allegations in tems of their j
l substance and safety significance, t
We I hope the above infomation is responsive to your request at this time.
anticipate completing our special inspection and the report thereof by the f
and of November 1982. A copy of the report will be forwarded to you at that
~
l time.
Sincerely, j
Jsigned) Jack W. Io
)
William J. Dircks l
Executive Director i
for Operations i
j NOV 12 982
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