ML20138L216

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Forwards Listed Info Including Newspaper Accounts,Zack & Bechtel Allegations & Code Requirements Re Allegation,Per Request
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)
v • d • e


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  • NB 4000-FABRICATION AND INSTALLATION REQUIREMENTS N B.4230-N B.4233 fl .,

y NB4232 Masimum Offset of Aligned Sections *>Y g g, NB4230 FFITING AND ALIGNING ,

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 NB.42321, where s is the nominal thickness of the i aligned, and retained in position during the welding thinner section at thejoint.

operation by the use of bars, jacks, chmps, tack 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 .

i alignment shall either be removed completely, when NB-42321 for longitudinaljoints.

g they have served their purpose, or their stopping and g NB-4232.1 Fairing of Offsets. Any offset within the E starting ends shall be properly prepared by grinding or other suitable means so that they may be allowable toIerance provided above shall be I.hred to

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at least a 3 to I taper over the width of the fmished b satisfactorily incorporated into the final weld. Tack weld or,if necessary,by addingadditionalweld metsi b welds shall be made by qualified welders using beyond what would otherwise be the edge of the weld.

3 qualified welding procedures. When tack welds are to In addition, offsets greater than those stated.in Table become part of the finished weld, they shall be

], NB-42321 are acceptable provided the requirements l . visually examined and defective tack welds removed.

of NB 3200 are met. '

,, g A NB4231.2 Temporary Attachments and Delt Re- *

[moial. Attachments whic's are welded to the com- NB4233 , Alignment Requirements When 7

ponent during construction but which are not Component Inside Surfaces Arc y .

incorporated into the final component, such as inaccessible J'I alignment lugs or straps, tie straps, braces, preheat When the inside surfaces of comgmnents 4re l

inaccessible for welding or fairingin accordan. e with J1 equipment, postweld heat treatment equiomen_,

t are

  • 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 f

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.# (a) De material is identified and is suitable for weldingbut need not be certified material.

concentrically, a uniform mismatch of %in.around the joint can result as shown in Fig. N B.42331 sk, (a).

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(b) The material is compatible for welding to the flowever, other variables not associated with 11.;

component material to which it is attached. diameter of the component of ten resultin abpn'ments f (c) The welding material is compatible with the that are offset rather than concentric. In these cases, (h p base material and is certified in accordance with NB.

2130; the maximum misalignment at anj one pomt around the joint shall not exceed W in., as shown m Fig. NB.

I%g (d) He welder and welding procedure are qualified 42331 sk. (b). Should component tolerances such as in accordance with Section IX and the additional diameter, wall thickness, out of roundners, result in (h i requirementsof NB.4320. inside diameter variations which do not meet these 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 has been examined in accordance with (g)below. *

(/) T.ie temporary attachment is completely re- TABLE NB.42321 '

h) g moved in accordance with the procedures of ND*

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MAXIMUM ALLOWABLE OFFSET IN FINAt. WELDED JOINTS in g (g) After the temporary attachment has been ' ,

l n removed, the marked area is examined by a magnetic . o;,. won of .wam a ,p.

Sadoa Na* .

M particle or liquid penetrant method in accordance .

with the requirements of Atticles 6 and 7 of Section V*

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and meets the acceptance standards of NB 5340 or 7 un io it2. nad.

7,9 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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l of the attachment is postweld heat treated in acq .

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IWt  :- 45' M A XIMU M g[ MAXIMUW .

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MAXIMUM SLOPE -

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1/32 in. MAXIMUM UNIFORM MISMATCH p - - .

BORE DIAMETER 11/32 in.

g AROUND JOINT pgpg g . .

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{ /./////A i ALTERNATE IF COUNTERSORE ,

t = NOMINAL 9" *

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CONCENTRIC CENTERLlHES 3/32 in. MAXIMUM AT ANY ONE pgpg g z

  • POINT AROUND THE F COMPONENT (

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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 ,

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1 I. 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 ,

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DECREASEMINIMUM RfoulRED W4ll THKKNESS. ..

6. THt'VALUE Of"iMINTIN NNICNtVEYOF THE NALI$/NS 13 APPUCA6Lf; inJ TNE MIN. ORDERED WALL THICKNESS of THE P/P4 th (b) 0.875 T/MES NOM. WALL THICKNE P/P6 ScNEoute WALL TH/CKNess WH/cM MAS AW t/MMK TOLERANCE Cf /t.$ %,

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' (GR THE THINNER ef THE TWO) NUEN THE I l. %y JOINT /s BETWEEN TWO COMPONEN7*

6. THf MAW. THMKNIS.S AT THE INO ef THE C#fMNfMTBi no.<<s2

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SECHTEL power CORPORAT10N SAN ONOFRE MEAR SEMER AMC STA M N ,

90RwAL K.tALW enalA 91Lt Wfluf0 END TRANS/f/0NS FOR VAL VES , fo'TT/NGC, AND E00/PMfMT see mo. sats e noveo SOUTHERN CALIFORNIA E0ISON C 0 biP A N Y 10079*003 .. . . . _. ...-.. .

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.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 power plant in California'. According to these sources, E. Earl Kent, a former quality control engineer with Bechtel Power Corpora-tion, has noted " thousands of substandard welds on 71 pe and elec-trical system supports" at both San Onofre and anot.ier plant in Michigan. Mr. Kent alleges that if these welds fail, the pipe 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 ,

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. GL FILE L D0 12440 l

The Honorable Alan Cranston Keppler.RIII w/inc j

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l United States Senate Washington,D.C. 20510 t l r l

Dear Senator Cranston:

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i This is in response to your letter of October 29,1982, to Carlton Kamerer. t Office of Congressional Affairs, relating to allegations by Mr. E. Earl Kent

conce,rning welding quality at the San Onofre nuclear power plant. l 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  ;

J October 6, 1982. Direct contact was made that same day with Mr. Kent, and

a special inspection into his allegations was initiated by our Region V 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 I hope the above infomation is responsive to your request at this time. We f anticipate completing our special inspection and the report thereof by the  :

and of November 1982. A copy of the report will be forwarded to you at that ~

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time.  ;

' Sincerely, j

Jsigned) Jack W. Io William J. Dircks ) i l Executive Director  !

for Operations i j .

NOV 12 982

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