ML20063P204

Revised Pages 3,11,12 & 14 to Clinton Power Station Preservice Insp Program

ML20063P204
Person / Time
Site:	Clinton
Issue date:	10/06/1982
From:	ILLINOIS POWER CO.
To:
Shared Package
ML20063P200	List: ML20063P199 ML20063P204
References
PROC-821006, NUDOCS 8210130184
Download: ML20063P204 (5)

Text

._.,r> . _ _ _ _ _ _ .. _ _ _ . _._ _ _ _ _ _ _ _ . _ _ . _ _ _ __

Raviced 10/6/82 l, ' '

Clinton Powar Station Prasarvico Inspzetion Progrcm

1.0 INTRODUCTION

f i

Preservice Inspection (PSI)'at Clinton Power Station (CPS)  !

will be performed in'accordance with ASME Boiler & Pressure Code (hereafter referred to as the Code)Section XI, 1974

, Edition, through and including Summer 1975 4.ddenda, and the l 4

.teceptions/ alternate examinations listed in Table 2.1-1, l

, .Ge*eric Exceptions.  ;

Included in this PSI Program are the following items:

! 1) Non-destructive examination of piping, pumps, valves, i

component supports, vessels, and bolting.  ;

, 2) Valve testing which includes leak-rate testing, l exercising, stroke timing, and bench testing valves. '

i j 3) Augmented PSI requirements. '

i 2.0 NON-DESTRUCTIVE EXAMINATIONS (NDE) l In accordance with ASME Section XI, 1974 Edition, through '

l and including Summer'1975 Addenda,-the following items j shall receive NDE:

'l) Class 1 and 2 piping.

2) Class 1 and 2 pumps.

1

3) Class 1 valves.

4) Class 1, 2, and 3 component supports.

5) Class 1 and 2. vessels.

6) Class 1 and 2 bolting.

The exemption criteria used to determine which components i would not receive NDE is listed in' Table 2.0-1,Section XI i

Code Exemption Criteria.

To meet the Section XI requirements for preservice hydrostatic testing and visual examination of Class 1, 2, and 3 pressure-retaining components, the Section III hydrostatic test and visual examination shall be utilized.

A listing of calibration standards and their associated components is found in Table 2.0-2, PSI Calibration Standards.

The examination volume and techniques shall be determined by the requirements of the 1977 Edition, Summer 1978 Addenda in lieu of the 1974 Edition (See Table 2.1-1, Section 7) l 831013o184 sa1006 3 i

PDR ADOCK 05000461

,C_L PDR

Raviced 10/6/82 ,

Clinton Powar S'tation Preservice Inspection Program TABLE 2.1-1 i

<.- -l'

! GENERIC EXCEPTIONS

l. Item

! .Subarticle IWB-2600, Table IWB-2600 examination item B4.5, .

Category G-J Circumferential and Longitudinal Piping Welds.

1 Code Recuirement Examine all non-exempt circumferential and longitudinal piping welds using a volumetric examination method.

Exception / Alternate Examination Circumferential and longitudinal welds in non-exempt -

i piping less than four (4) inch nominal pipe size shall I i be examined using a surface examination method in lieu

of volumetric. Welds.in non-exempt piping four (4) inch and larger shall be examined using a surface and volumetric method.

Justification i I By utilizing a volumetric and surface examination, it is possible to detect flaws where they are most likely j to occur, the bore and outside surfaces of a weld. Since.

j volumetric methods show no evidence of being superior to surface methods in piping under four (4) inch nominal pipe size,.only n' surface method will be used for under

four (4) inch piping. This exception is consistent with i subsequent Edition and Addenda and there were no objections expressed to it by the NRC in their adoption of the 1977 Edition through Summer 1978 Addenda j

2. Item i I

Subarticle IWB-2600, Table IWB-2600 examination items B4.9, l B5.5, and B6.5, Category B-Kil, : Integrally Welded Suports.

t Code Requirement >

Examine integrally welded support connection welds using a volumetric examination method.

Exception / Alternate Examination Integrally welded support lugs which are attached to piping '

using a partial penetration weld will be examined using a surface method in lieu of a volumetric method.

11

- .- - .~.

+ ,

Rtvised 10/6/82 -

Clinton Powar Station Preservico Inspection Program 1

TABLE 2.1-1

~

. GENERIC EXCEPTIONS (Continued)-

1 Justification Welded _ lugs-are-generally attached to piping using fillet welds. This is not a full penetration weld and therefore, ultrasonic examinations will not produce satisfactory results. Additionally, the expected failure i mode of the weld is due to surface cracking. The sub-i stitution of a surface examination method will produce mo e meaningful results-and thus a superior examination.

l 4

3. Item Subarticle IWC-2600, Table IWC-2600 examination items C2.1 i and C2.2, Circumferential and Longitudinal Piping Welds.

} Code-Requirements

) Examine all non-exempt circumferential and longitudinal i piping welds using a volumetric method.

, Exceotion/ Alternate Examination

Examine all non-exempt circumferential-and longitudinal l welds in piping with-1/2 inch-nominal wall thickness L and less using a surface examination. All ocher non-t exempt circumferential and longitudinal welds shall be

{ examined using surface and volumetric methods.

i Justification This methoi of examination is consistent with later Edition anc Addenda of the Code expected to be used in Subsequent *SI examinations. The application of surface examination for thin walled . pipe was recognized by the Code in its Summer 1976 Addenda and is currently in the Summer 1978 Addenda. There is no clear evidence that an ultrasonic examination is superior to surface examination for thin wall pipe. Additionally, the systems affected by this exception are full of water and continuously pressurized and thus provide immediate indication of loss of integrity. For pipe with wall thickness greater than 1/2 inch, a surface examination and volumetric examination shall be performed to ensure that the highest stressed sections of the weld are examined.

12 1

-m______:_

RSvistd 10/6/82 Clinton Powar Station Preservice Insp ction Program TABLE 2.1-1 GENERIC EXCEPTIONS (Continued)

4. Item Subarticle IUC-2600, Table IWC-2600 examination item C1.4, l Category C-D, Pressure Retaining Bolting Exceeding One (1)

Inch in Diameter.

Code Recuirements {

Examine all pressure retaining bolting exceeding one (1) inch diameter using visual and either surface or volumetric {

methods.

Exception / Alternate Examination

• Pressure retaining bolting greater than two ~ (2) inches in diameter shall receive volumetric examination as required by subsequent editions and addenda of the Code.

Justification This examination is consistent with the requirements for Class 1 pressure retaining bolting and with the Code Edition and Addenda to be used during subsequent ISI's.

i

5. Item Subarticle IWC-2600, Table IWC-2600 examination item C2.3, l Catgories C-F and C-G, Piping Branch Connection Welds.

I Code Requirement Lxamine Piping Branch Connection Welds in non-exempt piping using a volumetric method.

Exception / Alternate Examination Piping branch connections in non-exempt systems shall be examined using a surface method.

Justification This weld configuration produces geometric reflectors which make it impractical to perform a sound ultrasonic examination. Radiography is not considered a viable -

)

option because of lack of repeatability during subsequent ISI's. Surface examination of piping branch connection welds are currently accepted in the 1977 Edition, Summer 1978 Addenda of the Code.

• Change from PSI abstract submittal.

13 W. _ _ _ _ _ _ _ . _ _ _ _ _ _

Rsvie d 10/6/82

, Clinton Pow:2r-Station-Preservico Incpcction-Progrcm TABLE 2.1-1 GENERIC EXCEPTIONS (Continued)

! 6. In addition to the aforementioned exceptions, CPS wi.ll also I l utilize Appendix III-(Summer 1975) to Section XI of'the Code -

in: lieu of Appendix I and Article 5 of.Section V of; the examination of carbon steel components. Appendix I'~and Article 5 of Section V shall still be utilized for.the examination of austenitic steel components. There were

j. no adverse comments to this approach expressed in the adopted change to 10CFR50 recognized the 1977_ Edition,

Summer 1978 Addenda.

.l i -

! 7. In order to provide better baseline data, the 1974 Edition, -

! Summer 1975 Addenda shall be used to determine which components shall be examined, and the 1977 Edition, Summer 1978 i

Addenda shall be used to determine examination volume and i method. This approach was taken because it was felt that

! the 1977 Edition, Summer 1978 Addenda provided for more comprehensive examinations and different Editions and Addenda will be used for subsequent ISI's.

s l

l 1

l t

i I

4 i

i l-i l

i 14