ML20086P630
| ML20086P630 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 12/19/1991 |
| From: | FLORIDA POWER CORP. |
| To: | |
| Shared Package | |
| ML20086P628 | List: |
| References | |
| NUDOCS 9112270107 | |
| Download: ML20086P630 (5) | |
Text
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l PLANT SY$1Dil 3/4.7.9 HYORAULIC SNUBBERS LIMITING COMITION FOR OPERATION 3.7.9.1 All hydraulic snubbers shall be OPERABLE.
The only snubbers excluded from the requirement are those installeo on non safety related systems and then only if their failure or failure of the system on which they are installed would have no adverse effect on any safety related system.
APPLICABILITY:
H0 DES 1, 2, 3, and 4.
ACT10Ni With one or more hydraulic snubbers inoperable, replace or restore the inoperable snubber (s) to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUIDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
SURVEILLANCE REQUIREMENTS 4.7.9.1 Each snubber shall be demonstro ad OPERABLE by the performance of the following augmented inservice inspection program in addition to the requirements of Specification 4.0.5.
a.
InJpaction Tvoes As used in this specification, " type" shall apply to snubbers of the same design and manufacturer, irrespective of capacity, b.
Visual Inspection 1 Snubbers are categorized as inaccessible or accessible during reactor operation.
Each of these categories (inaccessible and accessible) may be inspected independently according to the schedule determined by Table 4.7-4.
The visual inspection interval for each category of snubber shall be determined based upon the criteria proviu'ed in Table 4.7-4.
1 CRYSTAL RIVER - UNIT 3 3/4 7-25 Amendment No.
P12.iz70 P>/ yIla v PLE ADOCN OWo3302 P
PLANT SYSTEMS tiEMVilLSHUBERSErntinud HRK1LLAME_EQWMtiENTS (Continuedl c.
Yhtal Inspection Accep1Ln_st.[rLLer1A Visual inspections shall verify that (1) the snubber has no visible indications of damage or impaired OPERABILITY, (2) attachments to the foundation or supporting structure are f unctional, and (3) fasteners for the attachment of the snubber to the component and to the snubber anchorage are functional.
Snubbers which appear inoperable as a result of visual inspections shall be classified as unacceptable and may be reclassified acceptable for the purpose of establishing the next visual inspection interval, provided that (1) the cause of the rejection is clearly established and remedied for that particular snubber and for other snubbers irrespective of type that may be generically susceptible; and (2) the affected snubber is functionally tested in the as-found condition and determined OPERABLE.
All snubbers found connected to an inoperable conmon hydraulic fluid reservoir shall be counted as unacceptable for determining the next inspection interval.
A review and evaluation shall be performed and documented to justify continued operation with an unacceptable snubber, if continued operation cannot be justified, the snubber shall be declared inoperable and the ACTION requirements shall be met.
d.
At least once per 18 months during shutdown, a representative sample of at least 10 hydraulic snubbers or at least 10% of all snubbers referenced in Specification 3.7.9.1 shall be selected and functionally tested to verify correct piston movement, lock up and bleed.
Snubbers greater than 50,000 lbs. capacity may be excluded from functional testing requirements.
Snubbers selected for functional testing shall be selected on a rotating basis.
Snubbers identified as either "Especially Difficult to Remove" or in "High Radiation Zones" may be exempted from functional testing provided these snubbers were demonstrated OPERABLE during previous functional tests.
Snubbers found inoperable during functional testing shall be restored to OPERABLE status prior to resuming operation.
For each snubber found inoperable during these functional tests, an additional minimum of 10% of all snubbers or 10 snubbers, whichever is less, shall also be functionally tested until no more failures are found or all snubbers have been functionally tested.
CRYSTAL RIVER - UNIT 3 3/4 7-26 Amendmr;t No.
TABLE 4.7-4
$NUBBER VISUAL INSPECTION INTERVAL l@f!ER OF UNACCEPTABILSNUBDERS population Column A Column B Column C or Category Extended Interval Repeat Interval Reduced Interval Sizes (Note l)
(Note 2)
Uigtes 3 and 5)
(Notes 4 and 5) 100 0
1 4
150 0
3 8
i 200 2
5 13 300 5
12 25 400 8
18 36 Note 1:
Snubbers may be categorized, based upon their accessibility during sower operation, as accessible or inaccessible. These categories may se examined separately or jointly. However, the licensee must m ne and document that decision before any inspection and shall use that decision as the basis upon which to determine the next inspection interval for that category.
Note 2:
Interpolation between population or category sizes and the number of unacceptable snubbers is permissible. The next lower integer for the value of the limit for Columns A, B, or C is used if that integer includes a fractional value of unacceptabic 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 or 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.
Note 5:
If the number of unacceptable snubbers is equal to or greater than the number in Column C, the next 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 the number in Column B, 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.
Note 6:
The provisions of Specification 4.0.2 are applicable for all inspection intervals up to and including 48 months.
CRYSTAL RIVER - VNIT 3 3/4 7-35 Amendment No.
ELARL5151MS 3 /4. 7. 8 AU)LILI ARY BU I LRitLLYIBUW (DH_IllBUILSY5T EM k&lfS The OPERABILITY of the Auxiliary Building ventilation exhaust system ensures that suitable ambient conditions for personnel and equipment are maintained for all operating periods and that the effects of post accident conditions in the Auxiliary Building are mitigated.
Supply and exhaust duct systems are arranged to direct air from areas of low to higher activity eventually directing it to the main exhaast filter system and from there through the fans to the exhaust vent.
The main exhaust filters include roughing, HEPA, and charcoal cells.
3/4.7.9 HYDRAULIC SNUBB MS The hydraulic snubbers are required OPERABLE to ensure that the structural integrity of the reactor coolant system and all other safety-related systems is maintained during and following a seismic or other event initiating dynamic loads.
The only snubbers excluded from this inspection program are those installed on nonsafety-related systems, and then only if their failure or failure of the system on which they are installed would have no adverse effect on any safety related system.
The inspection frequency applicable to snubbers containing seals fabricated from materials which have been demonstrated compatible with their operating environment is Lased upon maintaining a constant level of snubber protection.
Therefore, the required inspection interval var!es inversely with the observed snubber failures.
To provide further assurance of snubber reliability, a representative sample of installed snubbers will be functionally tested during plant shutdowns at 18 month intervals.
These tests will include stroking of the snubbers to verify proper piston movement, lock-up and bleed. Observed failures of these sample snubbers will require functional testing of additional units. To minimize personnel exposures, snubbers installed in high radiation zones or in especially difficult to remove locations may be exempted from these functional testing requirements provided the OPERABillTY of these snubbers was demonstrated during functional testing at either the completion of their fabrication or at a subsequent date.
CRYSTAL RIVER - UNIT 3 8 3/4 7-5 Amendment No.
-~
SHOLLY EVAltlATION Of REQUEST:
Florida Power Corporation has reviewed the requirements of 10CFR50.92 as they relate to the proposed change to the snubber visual inspection requirements and considers the proposed change not to involve a significant hazards consideration.
In support of this conclusion the following analysis is provided:
1.
The proposed change will not significantly increase the probability or consequences of an accident previously evaluated because the existing snubber operability requirements will remain intact.
The operability continues to be demonstrated by visual and functional testing.
The functional testing will continue to be performed in accordance with established Technical Specification and ASME Section XI requirements. Visual ins)ections will provide additional confidence in snu)ber operability.
2.
The proposed change will not create the possibility of a new or different kind of accident from any accident previously evaluated because the change will not alter plant configuration or change parameters governing normal plant operation.
Snubber operability will continue to be maintained by visual and functional testing.
3.
The proposed. change will not involve a significant reduction to the margin of safety because the snubber system will continue to be fully capable of performing its intended safety function.
The alternate visual inspection schedule maintains the same confidence level of snubber operability as the existing schedule.
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