ML20040A998
| ML20040A998 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 01/15/1982 |
| From: | WISCONSIN ELECTRIC POWER CO. |
| To: | |
| Shared Package | |
| ML20040A997 | List: |
| References | |
| TAC-10142, TAC-10143, TAC-11300, TAC-11321, NUDOCS 8201230046 | |
| Download: ML20040A998 (3) | |
Text
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15.4.13 Shock Suppressors (Snubbers)
Applicability Applies to the periodic inspection and testing requirements of safety related snubbers.
Objective To verify the operability of the snubbers.
Specifications The following surveillance requirements apply to those snubbers listed in Table 15.3.13-1.
1.
All snubbers shall be visually inspected to verify operability in accordance with the following schedule:
Number of Snubbers Next Required Found Inoperable Inspection During Inspection Interval or During Inspection Interval 0
18 months f;25%
1 12 months f;25%
2 6 months f; 25%
3, 4 124 days f; 25%
5, 6, 7
62 days + 25%
>8 31 days j; 25%
The required inspection interval shall not be lengthened more than one step at a time.
2.
During each refueling shutdown, two representative snubbers shall be functionally tested for operability. The hydraulic snubber functional test shall verify a.
Activation (restraining action) is achieved within the specified range of velocity or acceleration in both tension and compression.
b.
Snubber bleed, or release rate, where required, is within the specified range in compression or tention. For snubbers specifically required not to displace under continuous load, the ability of the snubber to withstand load without displacement shall be verified.
15.4.13-1 8201230046 820115 PDR ADOCK 050002gg P
l 15.4.13 Shock Suppressors (Snubbers) (Continued) i c.
For each snubber found to be inoperable, an additional 10% of that type snubber shall be tested until no more failures are found or all units have been tested.
3.
The initial inspection shall be performed within 6 months from the date of issuance of these specifications. For the purpore of entering the schedule in Specification 15.4.13.1, it shall be assumed that the facility had been on a 6 month interval.
4.
A record of the service life of each snubber, the date at which the designated service life commences and the installation and maintenance records on which the designated service life is based shall be maintained. Concurrent with the next inservice visual inspectirn and at least once per 18 months thereafter, the installation and maintenance records for each snubber listed in Table 15.3.13-1 shall be reviewed to verify that the indicated service life has not been exceeded or will not be exceeded prior to the next scheduled snubber service life review. If the indicated service life will be exceeded prior to the next scheduled snubber service life review, the snubber service life shall be reevaluated or the snubber shall be replaced or reconditioned so as to extend its service life beyond the date of the next scheduled service life review. This reevaluation replacement or reconditioning shall be indicated in the records.
Bases l
All safety related snubbers are visually inspected for overall integrity and operability. The inspection will include verification of proper orientation, adequate hydraulic fluid level and proper attachment of snubber to piping and structures. To further increase the assurance of snubber reliability, functional tests are performed once each refueling cycle on a representative 15.4.13-2 l
O sample of snubbers. These tests include stroking of the unit to verify proper piston movement, lock-up, and bleed within the acceptance criteria l
specified by the snubber manufacturers. Observed failures on these samples sna11 require testing of additional units. Snubbers rated e' 50,000 lbs.
or greater need not be functionally tested at their full rated capacity.
The inspection frequency is based upon maintaining a constant level of snubber protection. Thus, the required inspection interval varies inversely with the observed snubber failures. The number of inoperable snubbers found during a required inspection determines the time interval for the next required inspection. However, the results of such early inspections performed l
before the original required time interval has elapsed (nominal time less 25%)
may not be used to lengthen the required inspection interval. Any inspection whose results require a shorter inspection interval will override the previous schedule.
The snubbers selected for the testing and inspection mentioned in Specification 15.4.13.2 above are chosen on a rotating basis such that over a period of eleven refueling cycles all accessible snubbers will have i
l been tested.
15.4.13-3
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