ML20049J264
| ML20049J264 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 02/25/1982 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20049J263 | List: |
| References | |
| NUDOCS 8203120339 | |
| Download: ML20049J264 (3) | |
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SAFETY EVALUATION REPORT BEAVER VALLEY UNIT NO. 1 INSERVICE INSPECTION RELIEF REQUESTS MATERIALS ENGINEERING BRANCH In a letter dated November 23, 1981, Duquesne Light Company requested relief from some examination requirements imposed by the 1974 Edition and Addenda through Summer 1975 of the ASME Code.
The requests have been reviewed and evaluated as documented below.
1.
Request relief from volumetric examination of welds in thin-wall piping listed below:
COMP 0NENTS:
1.
Recirculation Spray Piping Welds on 10" Lines 12" Lines RS-1-153B RS-3-1538 RS-2-153B RS-4-153B RS-25-1538 RS-ll-153B RS-26-1538 RS-12-153B RS-9-1538 RS-10-153B 2.
Safety Injection System Piping Welds on 10" Lines SI-16-153W SI-17-153W SI-26-153W SI-27-153W CODE CLASS:
2 EXAMINATION REQUIREMENT:
Table IWC-2520, Categories C-F and C-G and IWC-2600, Item C.2.1 requires that circum-ferential butt welds on piping be examined volumetrically to cover 100% of the weld.
BASIS FOR RELIEF:
The thickness of the piping materials used for the construction of these lines (0.134 to 0.180 inches) is such that meaningful results could not be expected with ultra-sonic examination as required by IWC-2600.
The problems associated with the ultrasonic examination of thin wall materials has been recognized by Section XI of the Code and 8203120339 820225 PDR ADOCK 05000334 C
. the requirement in subsequent addenda and editions (Winter 75 for. Class 1 and Summer 76 for Class 2) revised to require surface examination of welds in components with wall thickness of 1/2 inch and less.
ALTERNATIVE EXAMINATION:
Surface and visual examination of the welds on these lines will be performed as an alternative method.
EVALUATION:
This is a request for relief from the ultrasonic test requirements for portions of piping systems that were committed to in the augmented ISI program. The Licensee stated in a letter dated August 10, 1979, that requests would be made after the BVPS-1 first refueling outage which was completed in November 1980.
The staff has reviewed the change in the examination requirements for thin-wall piping and finds the requirements, visual and surface examination, in subse-quent editions of Section XI acceptable.
We conclude that relief from volumetric examination of the welds requested may be granted.
2.
Request relief from volumetric examination of thin-wall Class 2 piping (0.134 to 0.180 inches) required by the 1974 Edition of Section XI.
CODE REQUIREMENT:
Table IWC-2520, Categories C-G and C-F, and IWC-2600 Item C.2.1 requires volumetric examination of 100% of piping welds.
Licensee Basis for Requesting Relief The problem associated with the ultrasonic examination of thin-wall materials has been recognized by Section XI of the ASME Boiler and Pressure Vessel Code and the requirement in subsequent addenda and editions (Winter 1975 for Class 1 and Summer 1976 for Class 2 Components) have been revised to require surface examinations of welds in components with wall thicknesses of 0.500 inches and less.
Based on the revised ' editions of ASME, surface examinations of specific thin-wall piping will be performed in lieu of ultrasonic examination.
EVALUATION:
The staff has reviewed the change in the examination requirements for thin-wall piping and finds that the requirements, surface and visual examination, produce better results and are more practical methods l
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.: e for examination of thin-wall piping welds.
We conclude that the proposed surface and visual examination of this piping will provide adequate assurance of its structural integrity and that relief from volumetric examination may be granted.
3.
"During plant operation, the low head SIS injection pumps are run on a periodic..."
This is an editorial change to the licensee's Inservice Inspection Program.
The correction of "high" to " low" does not affect the safety of the plant or change the examination requirements for the ECCS.
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