ML20091D121
| ML20091D121 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 04/01/1992 |
| From: | NORTHEAST NUCLEAR ENERGY CO. |
| To: | |
| Shared Package | |
| ML20091D116 | List: |
| References | |
| NUDOCS 9204080087 | |
| Download: ML20091D121 (1) | |
Text
WMMUm i
l TABLE 4.7-3 SNUBBER VISUAL INSPECTION INTERVAL NUMBER OF UNACCEPTABLE SNUBBERS l
o 3:
f P
"G Population Column A Column B Column C a
or Category Extend Interval Repeat Interval Reduce Interval l
M (Notes 1 and 2)
(Notes 3 and 6)
(Notes 4 and 6)
(Notes 5 and 6) l f
b 1
0 0
I l
i5 80 0
0 2
l 100 0
1 4
t z
f >o 150 0
3 8
t m
200 2
5 13 I
E8 300 5
12 25 l
95 The next visual inspection interval for a snubber population or category size shall be determined based Note 1:
un upon the previous inspection interval and the nucber of unacceptable snubbers found during that g
82 interval.
Snubbers may be categorized, based upon their accessibility during power operation, as i
accessible or inaccessible.
These categories may be examined separately or jointly.
However, that ggo mu 1
decision must be made and documented before any inspection and that decision shall be used as the w
basis upon which to determine the next inspection interval for that category.
y d>
Jory sizes and the number of unacceptable snubbers is
" Note 2:
Interpolation between population permissible. Use next lower integer fo.
...e value of the limit for Columns A, B, or C f f that integer includes a fractional value of unacceptable snubbers as determined by interpolation.
Note 3:
If the number of unacceptable snubbers is equal to or less than the number in Column A, the next inspection interval may be twice the previous interval but not greater than 48 months.
E If the number of unacceptable snubbers is equal to or less than the number in Column B but greater than
@ Note 4:
the number in Column A, the next inspection interval shall be the same as the previous interval.
If the number of unacceptable snubbers is equal to or greater than the number in Column C, the next
" Note 5:
8-inspection interval shall be two-thirds of the previous interval.
However, if the number of unacceptable snubbers is less than the number in Column C but greater than tne number in Column B, Q
the next interval shall be reduced proportionally by interpolation, that is, the previous interval shall be reduced by a factor that is one-third of the ratio of the difference between the number of unacceptable snubbers found during the previous interval and the number in Column B to the difference in the numbers in Columns B and C.
The provisions of Specification 4.0.2 are applicable for all inspection intervals up to and including Note 6:
48 months.
,