ML20083F255
| ML20083F255 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 09/26/1991 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20083F256 | List: |
| References | |
| NUDOCS 9110040156 | |
| Download: ML20083F255 (2) | |
Text
-.. -
_ ~
I PLANT SYSTEMS SURVEILL ANCE RE_QUIREJMENTS 1?_o_ntinu_ed) t I
a.
GeneraLReguirements At least once per inspection interval, each group of snubbers in use in the Plant shall be visually inspected in accordance with Specification 4.7.7.1.b and 4.7.7.1.c.
Visual inspections may be performed with binoculars, or other visual support devices, for those snubbers that are difficult to access and where required to keep exposure as low as reasonably achievable.
Response to failures shall be in accordance with Specification 4.7.7.1.d.
b.
in,slectiun' interval
_l The inspection interval may Le applied on the basis of l
snubber groups.
The snubber groups may be established based on physical characteristics and accessibility.
Inaccessible snubbers are defined as those located: (a)inside 1
containment (b) in high radiation exposure zones, or (c) in areas where accessibility is limited by physical constraints such as the need for scaffolding.
l Lach of the groups may be inspected independently according to the schedule determined by Table 4.7-5.
The visual inspection interval for each snubber group shall be detennined based upon the criteria provided in Table 4.7-5, and the first inspection interval detennined using the criteria shall be based upon the previous inspection interval as established by the requirements in effect before amend-ment 161.
t d
DAVIS-BESSE, UNIT 1 3/4 7-21 Amendment No. 94,161-(next page is 3/4 7-21a)
- u" pdm 7M$p
- P.
e TABLE 4.7-5 SNUBBER VISUAL INSFECIION INTERVAL i
NUMBER OF UNAOCE:' TABLE SNUBBERS Population Column A Column B Column C or Group Extended Interval Repeat Interval Reduced Interval (Notes 1 and 2)
(Notes 3 and 6)
(Notes 4 and 6)
(Notes 5 and 6) 1 0
0 1
80 0
0 100 0
1 4
2 150 0
3 200 2
8 5
13 300 5
12 25 400 8
18 36 500 12 24 750 20 40 78 48 1000 or greater 29 56 109 Note 1:
The next visual inspection interval for a snubber population or group size rhall be determined based upon the previous inspection interval and the number of unacceptable snubbers found during that interval.
during power operation, as accessible or inaccessible. Snubbe These categories may be examined separately or jointly.
However, the licensee must make and docueent that decision before any inspection and shall use that decision as the basis upon which to determine the next inspection interval for that groups Note 2:
Interpolation between popula tion or group sises and the numbet of unacceptable snubbers is permissible. Use next lover integer for the value of the limit for Columns A, B or C if 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.
Note 4:
If the number of unacceptable snubbers is equal to er less than the number in Column B but greater than the number in Column A.
the next inspection interval shall be the same as the previous interval.
DAVIS-BESSE, UNIT 1 3/4 7-21a Amendment No,161
.. ~.
.s- -,,
-