ML13326A890
| ML13326A890 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 08/24/1992 |
| From: | SOUTHERN CALIFORNIA EDISON CO. |
| To: | |
| Shared Package | |
| ML13326A889 | List: |
| References | |
| NUDOCS 9208260209 | |
| Download: ML13326A890 (1) | |
Text
- 0 32' If the additional inspection in Specification B.2 indicates that more than 10 percent of the additionally inspected tubes are degraded tubes that were not classified as degraded tubes during the previous inspections or have previously detected imperfections that have increased more than 10 percent wall penetration since their last inspection, or one or more of the additionally inspected tubes have an imperfection in excess of the plugging limit, inspect an additional 6 percent of the tubes in that steam generator in the area of the tubesheet array where tubes with imperfections were found and through that length of tube where the imperfections were found.
C.
INSPECTION FREQUENCY The inspections in Specifications A and B above shall be performed at the following frequencies:
- 1.
Inservice inspections shall be not less than 10 nor more than 24 calendar months after the previous inspection.*
- 2.
If two consecutive inspections indicate that less than 10 percent of the total tubes inspected are degraded tubes that were not classified as degraded tubes during the previous inspections or have previously detected imperfections that have increased more than 10 percent wall penetration, the inspections shall be not less than 10 nor more than 40 calendar months after the previous inspection.
- 3.
Unscheduled inspections shall be conducted in accordance with Specification A in the event of primary-to-secondary leaks exceeding Specification 3.1.4 a seismic occurrence greater than an operating basis earthquake, a loss-of coolant accident requiring actuation of engineered safeguards, or a major steam line or feedwater line break.
D.
ACCEPTANCE CRITERIA
- 1.
As used in this specification:
- a.
Imperfection means an exception to the dimensions, finish, or contour required by drawing or specification. Detectable eddy current testing indications below 20 percent of the nominal tube wall thickness, may be considered as imperfections.
- b.
Degradation means a service-induced cracking, wastage, pitting, wear or general corrosion occurring on either inside or outside of a tube.
- c.
Degraded Tube means a tube containing imperfections greater than or equal to 20 percent of the nominal wall thickness caused by degradation above the tube roll expansion. Also, a tube with an imperfection in the region one-half inch below the uppermost one inch of sound roll, is considered a degraded tube.
- d.
Defect means an imperfection of such severity that it exceeds the plugging limit or an imperfection located in the uppermost one inch of the tube roll expansion. A tube or sleeve containing a defect is defective.
- A 28-month interval between steam generator inspections is authorized for the inspection interval ending in 1992.
SAN ONOFRE - UNIT 1 4.16-2 AMENDMENT NO.
9208260209 920824 PDR ADOCK 05000206 P