ML18153B405
| ML18153B405 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 12/10/1993 |
| From: | VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | |
| Shared Package | |
| ML18153B404 | List: |
| References | |
| NUDOCS 9312200171 | |
| Download: ML18153B405 (4) | |
Text
e TS 4.2-2 Sensitized stainless steel augmented inspections were added to assure piping integrity of this classification.
Item 2.1 The examinations required by this item utilize the periodically updated ASME Section XI Boiler and Pressure Vessel Code referenced in Technical Specification 4.0.5 in this augmented examination.
The surface and volumetric examinations required by this item will be conducted at three times the frequency required by the Code in an interval.
In addition to the Code required pressure testing, visual examinations will be conducted, while the piping is pressurized by the procedures defined in Tables 4.1-3A & B of Technical Specification 4.1, concerning flushing of sensitized stainless steel piping. Weld selection criteria are modified from the Code for Class 1 welds, since stress level information as correlated to weld location is unavailable for Surry.
Item 2.2 The sensitized stainless steel located in the containment and recirculation spray. rings in the overhead of containment are *classified ASME Class 2 components. These components are currently exempted by ASME Section XI from surface and volumetric examination requirements.
As such, an augmented program will remain in place requiring visual (VT-1) examination of these components for evidence of cracking. Additionally, sections of the piping will be examined by liquid penetrant inspection when the piping is visually inspected.
9312200171 931210 PDR ADOCK 05000280 P
- PDR Amendment Nos.
TABLE 4.2-1 SECTION A. MISCELLANEOUS INSPECTIONS Required Required Examination Examination 10-Year Item No.
Area Methods Interval Inspection 1. 1 Deleted
- 1. 2 Low Head SIS Visual Non-applicable piping located in valve pit 1.3 Primary Pump See remarks See remarks Flywheel 1.4 Low Pressure Visual and 100% of blades every 5 Turbine Rotor Magnetic years*
Particle or Dye Penetrant Note 1:
1 year corresponds to 1 year effective full power operation.
Note 2:
The results obtained from these examinations shall be used to update Figure 3.1-1 as required.
For Unit 2, the 5 year inspection schedule can be extended until the Cycle 11 refueling outage.
The 5 year inspection schedule for Unit 2 will be reinitiated following the Cycle 11 refueling outage.
Remarks This pipe shall be visually inspected at each refueling shutdown.
Examination to be conducted in accordance with regulatory position C.4.b of regulatory guide 1.14 Rev. 1, August 1975 None
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SECTION B. SENSITIZED STAINLESS STEEL Item No, 2.1.1 2.1.2 2.1.3 Required Examination Area Class 1 circumferential, longitudinal.
branch pipe connection, and socket welds Class2 circumferential, longitudinal, branch pipe connection, and socket welds Class 1 and Class 2 sensitized stainless steel pieces TABLE 4.2-1 (continued)
Required Examination Methods As required by T.S. 4.0.5 As required by T.S. 4.0.5 Visual (VT-2) as required by T.S. 4.0.5 10-Year Interval Inspection The welds examined by volumetric or surface techniques shall be conducted at three times the frequency required by T.S. 4.0.5 The welds examined by volumetric or surface techniques shall be conducted at three times the frequency required by T.S. 4.0.5 As required by T.S. 4.0.5 Remarks A minimum of 5% of the welds shall be examined each refueling outage. At least 75% of the total population of welds shall be examined each interval. The same welds may be selected in subsequent intervals for examination.* See Note 1.
A minimum of 2.5% of the welds shall be examined each refueling outage. At least 22.5% of the total population of welds shall be examined each interval. The same welds may be selected in subsequent intervals for examination. See Note 1.
In addition to the Code required examinations the affected piping shall be visually (VT-2) examined during the flushing requirements of T.S. Tables 4.1-3A and 4.1-3B.
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TABLE 4.2-1 (continued)
SECTION B. SENSITIZED STAINLESS STEEL Item No, 2.2.1 Required Examination Area Containment and Recirculation Spray Piping Required Examination Methods Visual (VT-1) and surface examination 10-Year Interval Inspection (See remarks)
Remarks At least 25% of the examinations shall have been completed by the expiration of one-third of the inspection interval and at least 50%
shall have been completed by the expiration of two-thirds of the inspection interval. The remaining required examinations shall be completed by the end of the inspection interval. Surface examinations will include 6 patches (each 9 inches square) evenly distributed around each spray ring.
e Note 1:
a)
The examinations shall be distributed among the systems prorated, to the degree practicable, on the number of sensitized stainless steel welds in each system (i.e., if a system contains 30% of the welds, then 30% of the required examinations shall be performed on that system).
b) Within a system terminal ends (e.g., branch connections, pipe to pump, pipe to valve) shall be selected. The remainder of the selection shall select structural discontinuities (pipe fittings) prorated to the degree practicable to the number of discontinuities in that system. Other selections may be necessary to meet the total weld selection criteria.
c)
Within each system, examinations shall be distributed between line sizes prorated to the degree practicable.
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