ML20036C107
| ML20036C107 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 06/07/1993 |
| From: | Maine Yankee |
| To: | |
| Shared Package | |
| ML20036C104 | List: |
| References | |
| NUDOCS 9306140076 | |
| Download: ML20036C107 (5) | |
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ATTACHMENT B Proposed Technical Specification pages 3.20-1, 4.9-1, 4.9-2 and 5.10-2 t
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'9306140076 930607 s
PDR ADOCK 05000309 M
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3.20.SH0CK SUPPRESSORS (SNVBBERS)
Apolicability:
Applies to those shock suppressors which support safety-related systems or components.
The only snubbers excluded from this requirement are those installed 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.
Ob.iective:
To specify the required condition of protection of shock suppressors required to be operable.
Specification:
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A.
The following conditions apply to all applicable snubbers:
1.
Snubbers shall be operable when the reactor is in Transthermal Condition (Condition 4) or above and the supported system is required to be operable by Technical Specifications.
2.
RH-HSS-101 and 102 shall be operable whenever there is irradiated fuel in the reactor and the RHR System is required to be operable by Technical Specifications.
Exception:
A snubber may be removed from service for a period not to exceed 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> for the purpose of performing surveillance testing or preventive maintenance.
Remedial Action:
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1.
If any applicable snubber is found to be inoperable, repair and make it operable or replace it with one which is operable within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.
2.
Perform one of the following within an additional 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />s:
Perform an engineering evaluation to demonstrate operability of the supported system or component with that inoperable snubber; or Declare the supported system inoperable and follow the Remedial Action statements for that system.
Basis:
Snubbers are designed to limit rapid motion of supported piping and components under loads which might occur during e severe earthquake or transient while allowing slow thermal motion.
An inoperable snubber could lead to loads in excess of design and even structural damage as a result of a seismic or other event producing severe dynamic loads. It is, therefore, required that all snubbers required to protect safety Amendment No. 23,65,95 3.20-1 Correction Letter of 08/18/87 ms
i 4.9 SH0CK SUPPP'
'R (SNUBBER) SURVEILLANCE TESTING j
Aeolicabi' ity:
Appl es to the surveillance requirements for those hydraulic shock suppressors
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which support safety-related systems or components.
Ob.iective:
To verify the operability of all safety related hydraulic shock suppressors.
Specification:
A.
Visual Inspections:
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1.
All applicable shock suppressors shall be visually inspected at an interval based on the results of the previous visual inspection and the following table:
Number of Snubbers Found Inoperable During Visual Next Inspection Inspection Interval Interval ( 25%)
0 18 months 1
12 months 2
6 months 3 or 4 124 days 5, 6 or 7 62 days 8 or more 31 days 2.
Visual inspections may be divided into groups of accessible or inaccessible snubbers based on their accessibility during reactor operation.
3.
Visual inspection of snubber groups may be performed at different i
intervals.
Inaccessible snubbers may be considered operable for determining the next inspection interval provided.
4.
Snubbers which fail visual inspections may be considered operable for determining the next inspection interval provided:
a.
The cause for the rejection is established and remedied for that snubber and all snubbers generically related; and b.
The operability of the failed snubber (s) is verified by functionally testing it in the as-found condition.
Note:
1.
These provisions do not apply when a snubber's fluid port is found uncovered.
2.
Inoperable snubbers connected to a common reservoir represent one failure for determining next inspection i
interval unless multiple individual failures are evident.
i Amendment No. 23,95 4.9-1 w.
c 4.9 SHOCK SUPPRESSOR (SNUBBER) SURVEILLAllCE TESTING (Continued) 5.
Visual inspections performed at reduced intervals may be limited to inspecting the snubber group for evidence of the known failure mechanism, provided a complete inspection is performed on the 18 month interval.
6.
Visual inspection intervals may not be lengthened by more than one step at a time.
7.
The provisions of Specification 4.0 are not applicable.
B.
Functional Tests Once each operating cycle, functionally tested. ple group of 1.
a representative sam applicable snubbers will be
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2.
The functional test sample group will be comprised of the snubbers which failed the functional test during the last
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operating cycle plus an additional ten percent of the applicable i
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Note:
Applicable snubbers selected for inclusion in the sample group should be selected so that all snubbers are tested before retesting.
3.
If any snubber fails the functional test:
a.
All snubbers generically related to the failed snubber I
(same design subject to the same deficiency) shall be j
functionally tested for that failure; and b.
An additional ten percent shall be added to the sample group for each snubber failure.
Note:
Inoperable snubbers connected to a common reservoir represent one failure for determining additions to the sample group unless multiple individual failures are evident.
4.
Functional testing shall continue until there are no failures or
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until all applicable snubbers have been tested.
C.
Snubber Service Life Monitoring 1.
Each refueling outage it shall be verified that all applicable snubbers will not exceed their expected service life before the next refueling outage.
2.
If a snubber's expected service life expires before the next refueling outage, the service life may be extended by re-evaluating, reconditioning or replacing that snubber and recording that maintenance in appropriate records.
Amendment No. 23,95 4.9-2
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Records of in -service inspections performed pursuant to these Technical Specifications.
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Records of Quality Assurance activities required by the QA.
Manual.
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Records of reviews performed for changes made to procedures or u gment or reviews of tests and experiments pursuant to 10 CFR i
1.
Records of meetings of the PORC and the NSAR Committees.
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Records of analysis required by the Radiological Environmental monitoring Program.
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Records of the service lives of all applicable snubbers including the date at which the service life commences and associated installation and maintenance records.
(See Specification 4.9.C) o.
Records of reviews performed for changes made to 0FF-SITE DOSE CALCULATION MANUAL and the PROCESS CONTROL PROGRAM.
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Amendment No. 34,50,77,86,95,125 5.10-2
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