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
.
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
\ 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:
- a. The ba=line4aspe::ica :. hall be p : fern: d ::::incid: . ii i; firs: =heda!:d refu !!ng ::::g but ne
!:::: 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.
- c. Additional, unscheduled inservice inspections shall be performed on each steam generator in accordance 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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