ML20214A219

Intervenor Exhibit I-ROREM-69,consisting of Training Manual for Inspectors Using Acceptance Criteria of NCIG-01,

ML20214A219
Person / Time
Site:	Braidwood
Issue date:	07/23/1986
From:	AFFILIATION NOT ASSIGNED
To:
References
OL-I-ROREM-069, OL-I-ROREM-69, NUDOCS 8705190332
Download: ML20214A219 (3)

Text

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2.0 GENERAL INSPECTI(M GUIDEl.INES 2.1 Introduction These Guidelines are to be used for visual inspection of structural welds and provide background information and instructions to assist the Inspector. Measuring techniques and guidance on the accuracy, frequency, and locations for measuring welds are discussed.

It is inportant for the Inspector to understand weld size requirements and the significance of measurement units in order to avoid rejection of acceptable welds.

Because of the numerous levels of inspection in the nuclear industryk some inspectors may be concerned about being 'second-Wessed'.

In an effort to assure all welds are acceptable at all levels of inspection, an Inspector may decide it is easier to reject any condition that is questionable or not obviously acceptable. Using this approach, an Inspector may feel he is doing the best job possible. However, any Inspector is not performing his job properly when acceptable welds are rejected.

'61ng'has occurred because some peoole have a different understanding of the meaning of the acceptance criteria. Just as important, many Inspectors have different understandings of how to determine when acceptance criteria are met.

of the purposes of this Training Manual is 3 te pressat += =11 fa<nact,3ck ntractor, owner or NitC) hod for MC _T ^ Cggeria and a standar g,g y.__w= -

_a f _m in 2.2 Genersi langsties Concepts In Section 3.0, Acceptance Criteria will be stated and specific Guidelines given for determining if a completed weld is acceptable or rejectable.

However, there are a numb,e Q;I.inspectien cansagts that apply to more than one of the AcceptTMFLr These comon inspection concepts are discussed in this section. Remember, the common inspection concepts will be used in making your accept-reject decfRonifor the. individual Acceptance Criteria where the concepts apply.

• The Inspector t pee",Lr-on-ent det e st u ' e

'pedaptasse er '

sa separ e each Acceptance Criteria.

• Th should direct his attention to areas that are potentially h make detailed measurement in areas of obvious

" compliance with the Acceptance Criteria. Continuous or near continuous e

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• pe casu.1.and i====qti.onefaio intendd jo evaluate verify that the work 3 weaatabhe. They are not intended to upgrade downgrade the level of worFmanship br ir@ose more stringent criteria or examination methods.

Concerns regarding workmanship, if any, should be handled in accordance l

i with Project Instructions.

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October 1, 1985

• Visual inspection of welds is normally performed ~_on the as-welded s f i

ning by grindingTTQmag',' mTni"4tc., i s

• Lighting, natural or artificial, should be bright enough and placed so the surface area can be clearly viewed. Lighting is adequate when the Inspector can resolve a black line 1/32 inch or less on an 18 percent neutral gray card placed on the surface to be inspected. With experience, the Inspector should be able to judge the adequacy of lighting without referring to such a card.

• VTsunt n

~ ~Nies'on ng to detect the og checked 'usTiig" (with corrective glasses, if the Inspector normally uses them).

a condition is so small that its relevance can not be detennined with ordinary eyesight, the condition is acceptable.

• If a magnifying lens is used it should provide a magnification of approximately 5 to 10 times. Higher magnifications are not needed and should not be used.

• Tape measures and metal scales are suitable for measuring length and location of welds.

• Metal scales may be used for measuring the size of welds, but some Inspectors prefer fillet weld gages as being more convenient and appropriate for checking the size of fillet welds.

measurement '

of size over the full length of t mer-owpected.

• Fillet weld sizes are specified in 1/16 inch increments by the Engineer.

When measuring fillet welds, measurements shall be rounded-off to the nearest 1/16 inch by the Inspector.

• Measuring devices (tapes, scales, gages, etc.) should be-graduated in increments compatible with the applicable significant unit, e.g.,1/16 inch increments, rather than decimals. Micrometer type devices are not necessary.

2. 3 Measurements Many of the welds that the Inspector will inspect are described by dimensions that specify the size, length or location.

Dimensions are verified by measurement. The dimensional units on drawings and in the specifications may provide guidance with regard to how closely you need to measure.

Inspection is based on using measureinents expressed as feet, inch's. or fractions of inches. The following tabulation shows the smaller.

measurement unit used for dimensions that you may have to verify.

(Smallest measurement units are sometimes referred to as 'significant units'). Tabl e 2-1 identifies the smallest measurement units the Inspector will use when inspecting the listed weld attributes. When measuring and recording Page 2-2

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