ML20217C488
| ML20217C488 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 03/20/1998 |
| From: | CENTERIOR ENERGY |
| To: | |
| Shared Package | |
| ML20217C487 | List: |
| References | |
| NUDOCS 9803270040 | |
| Download: ML20217C488 (1) | |
Text
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L REACTOR COOLANT SYSTEM SURVETLLANCE REQUIREMENTS (Continued)
Notes:
(1)
In all inspections, previously degraded tubes must exhibit significant (> 10%) further wall penetrations to be included in the above percentage calculations.
(2)
Where special inspections are performed pursuant to 4.4.5.2.b, defective or degraded tubes found as a result of the inspection shall be included in determining the Inspection Results
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Category for that special inspection but need not be included in determining the Inspection Results Category for the general steam generator inspection.
4.4.5.3 Inspection Freauencies - The above required inservice inspections of steam generator tubes shall be performed at the following frequencies:
The ba=line4aspe::ica :. hall be p : fern: d ::::incid:. ii i; firs: =heda!:d refu !!ng ::::g but ne a.
!:::: inn Arri' ?0.19Pa Sub=quent linservice inspections shall be performed at intervals of not less than 12 nor more than 24 calendar months after the previous inspection. If the results of two consecutive inspections for a given group
- of tubes following service under all volatile treatment (AVT) conditions fall into the C-1 category or if two consecutive inspections demonstrate that previously observed degradation has not continued and no additional degradation has occurred, the inspection interval for that group may be extended to a maximum of 40 months.
b.
If the results of the inservice inspection of a steam generator performed in accordance with Table 4.4-2 at 40 month intervals for a given group
- of tubes fall in Category C-3, subsequent inservice inspections shall be performed at intervals of not less than 10 nor more than 20 calendar months after the previous inspection. The increase in inspection frequency shall apply until a subsequent inspection meets the conditions specified in 4.4.5.3a and the interval can be extended to 40 months.
Additional, unscheduled inservice inspections shall be performed on each steam generator in accordance c.
with the first sample inspection specified in Table 4.4-2 during the shutdown subsequent to any of the following conditions:
1.
Primary-to-secondary tube leaks (not including leaks originating from tube-to tube si.eet welds) l in excess of the limits of Specification 3.4.6.2.
If the leak is detennined to be from a renair roll icint. rather than selectine a random samnle.
insnect 100% of the renair roll ioints in the affected steam cenerator. If the resu5 of this insnection fall into the C-3 catecorv. Derform additional inscections of the new roll areas in the HDaffected steam cenerator.
- A group of tubes means:
l (a)
All tubes inspected pursuant to 4.4.5.2.b, or (b)
All tubes in a steam generator less those inspected pursuant to 4.4.5.2.b.
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DAVIS-BESSE, UNIT 1 3/44-8 Amendment No. 21, I
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