ML20029C688
| ML20029C688 | |
| Person / Time | |
|---|---|
| Site: | Byron, Braidwood  |
| Issue date: | 04/21/1994 |
| From: | Dick G Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20029C689 | List: |
| References | |
| NPF-37-A-060, NPF-66-A-060, NPF-72-A-048, NPF-77-A-048 NUDOCS 9404260030 | |
| Download: ML20029C688 (4) | |
Text
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PLANT SYSTEMS 3/4.7.8 SNUBBERS l
ilMITING CONDITION FOR OPERATION 3.7.8 All snubbers shall be OPERABLE.
Snubbers excluded from this requirement 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.
APPLICABILITY: MODES 1, 2, 3, and 4.
MODES 5 and 6 for snubbers located on systems required OPERABLE in those MODES.
ACTION:
With one or more snubbers inoperable, within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> replace or restore the inoperable snubber (s) to OPERABLE status and perform an engineering evaluation per Specification 4.7.8. on the attached component or declare the attached 9
system inoperable and follow the appropriate ACTION statement for that system.
SURVElllANCE REQUIREMENTS 4.7.8 Each snubber shall be demonstrated OPERABLE by performance of the following augmented inservice inspection program and the requirements of Specification 4.0.5.
a.
In_spection Types As used in this specification, type of snubber shall mean snubbers of the same design and manufacturer, irrespective of capacity.
b.
Visual Inspections 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 4.7-2.
The visual inspection interval for each type shall be determined based upon the criteria provided in Table 4.7-2 and the
'irst inspection interval determined using this criteria shall be cased upon the previous inspection interval as established by the requirements in effect prior to Amendment No. 60.
9404260030 940421 PDR ADOCK 05000454 P
PDR BYRON - UNITS 1 & 2 3/4 7-22 AMENDMENT N0.60
PLANT SYSTEMS 3/4.7.8 SNUBRJRS LIMITING CONDITION FOR OPERATION 3.7.8 All snubbers shall be OPERABLE.
Snubbers excluded from this requirement 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.
APPLICABILITY:
MODES 1, 2, 3, and 4.
MODES 5 and 6 for snubbers located on systems required OPERABLE in those MODES.
ACTION:
With one or more snubbers inoperable, within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> replace or restore the inoperable snubber (s) to OPERABLE status and perform an engineering evaluation per Specification 4.7.8. on the attached component or declare the attached system 9
inoperable and follow the appropriate ACTION statement for that system.
SURVEILLANCE RE0VIREMENTS 4.7.8 Each snubber shall be demonstrated OPERABLE by performance of the following augmented inservice inspection program and the requirements of Speciiichtion 4.0.5.
a.
Insoection Tvoes As used in this specification, type of snubber shall mean snubbers of the same design and manufacturer, irrespective of capacity.
b.
Visual Inspections Snubbers are categorized as inaccessible or accessible during reactor operation. Each cf these categories (inaccessible and accessible) may be inspected independently according to the schedule determined by Table 4.7-2.
The visual inspection interval for each type of snubber shall be determined based upon the criteria provided in Table 4.7-2 and the first inspection interval determined using this criteria shall be based upon the previous inspection interval as established by the requirements in effect before Amendment No. 48.
BRAIDWOOD - UNITS 1 & 2 3/4 7-20 AMENDMENT N0. 48
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PLANT SYSTEMS BASES SNUBBERS (Continued)
I that the frequency of snubber failures and initiating events is constant with to be unprotected and to result in failure during an initiating Generic Letter 90-09 " Alternate Requirements for Snubber Visual Inspection USNRC 1
Intervals and Corrective Actions
- provides information necessary to establish based upon the failure rates from the previous inspection.a meth determine OPERABILITY of the snubbers.The acceptance criteria are to For example, if a fluid port of a hydraulic snubber is found to be uncovered, the snubber shall be declared inoperable and shall not be determined OPERABLE via functional testing.
To provide assurance of snubber functional reliability at least 10% of with an additional 10% tested for each functional testing failure Permanent or other exemptions from the surveillance program for individual snubbers may be granted by the Commission if a justifiable basis for exemption is presented and, if applicable, snubber life destructive testing was performed to qualify the snubber for the applicable design conditions at either the completion of their fabrication or at a subsequent l
date.
indicating the extent of the exemptions. Snubbers so exempted shall be lis information through consideration of the snubber service con associated installation and maintenance records (newly installed snubbers, seal replaced, spring replaced, in high radiation area, in high temperature area, etc.).
The requirement to monitor the snubber service life is included to ensure that the snubbers periodically undergo a performance evaluation in view of their age and operating conditions.
i These records will provide statistical bases for future consideration of snubber service life.
j BYRON - UNITS 1 & 2 B 3/4 7-6 AMENDMENT NO. 60
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ptANT SYSTEMS S'URVE1LtANCE REOUIREMENTS (Continued)
Visual Insoection Acceotance Criteria c.
Visual inspections shall verify that:
(1) there are no visible indications of damage or impaired OPERABILITY, (2) attachments to the foundation or supporting structure are functional and (3) fasteners for attachment of the snubber to the component.ind 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 per Specification 4.7.8f.
All snubbers found connected to an inoperable common hydraulic fluid reservior shall be counted as unacceptable for determining the next inspection interval.
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A review and evaluation shall be performed and documented to justify continued operation with an unacceptable snubber.
the snubber shall be declared inoperable and the ACTION requ shall be met.
d.
Transient Event Insoection An inspection shall be performed of all snubbers attached to sections of systems that have experienced unexpected, potentially damaging transients as determined from a review of operational data and a visual inspection of the systems within 6 months following such an In addition to satisfying the visual inspection acceptance event.
criteria, freedom-of-motion of mechanical snubbers shall be verified using at least one of the following:
(1 manually induced snubber movement; or (2) evaluation of in-place s)nubber piston setting; or (3) stroking the mechanical snubber through its full range of travel.
BRAIDWDDD - UNITS 1 & 2 3/4 7-21 AMENDMENT NO. 48
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