ML20154J568
| ML20154J568 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 05/19/1988 |
| From: | SOUTHERN CALIFORNIA EDISON CO. |
| To: | |
| Shared Package | |
| ML13303A880 | List: |
| References | |
| NUDOCS 8805270050 | |
| Download: ML20154J568 (20) | |
Text
.
PLANT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued)
No. Inoperable Snubbers per Inspection Period Subsequent Visual,
Inspection Period" O
M months 25%
1 12 months t 25%
2 6 months 1 25%
3,4 124 days t 25%
5,6,7 62 days t 25%
8 or more 31 days i 25%
The snubbers may be categorized into two groups:
Those accessible and those inaccessible during reactor operation.
Each group may be inspected independently in accordance with the above schedule, c.
Visual Inspection Acceptance Criteria Visual inspections shall verify (1) that there are no visible indications of damage or impaired OPERABILITY, ana (2) attachments to the foundation or supporting structure are secure, and (3) fasteners for attachment of the snubber to pipe and (b) the snubber anchorage are secure. (Snubbers whicha) the comp appear inoperable as a result of visual inspections may be determined OPERABLE 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 that say be generically susceptible; and (2) the affected snubber is functionally tested in the as found condition and determined OPERABLE per Specification 4.7.6.e or 4.7.6.f, as applicable.
However, when a fluid port of a hydraulic snubber is found to be uncovered, the snubber shall be determined inoperable and cannot be detemined OPERABLE via functional testing for the purpose of establishing the next visual inspection interval. All snu;;,bers connected to an inoperable common hydraulic t1uid reservoir shall be counted as inoperable snubbers.
"The inspection interval shall not be lengthened more than one step at a time R
The provisions of Specification 4.0.2 are not applicable.
SAN ONOFRE-UNIT 2 3/4 7-17 AMENOMENT NO. 58 8805270050 880519 PDR ADOCK 05000361 P
P_LANT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued) d.
Functional Tests At least once per 18 months during shutdown, a representative sample of at least 10% of the total of each *ype of snubber in use in the plant shall be functionally tested either in place or in a bench test.
For each snubber of a type that does not meet the functional test acceptance criteria of Specification (.7.6.e or 4.7.6.f, an additional 10% of that type of snubber shall be functionally tested until no more failures are found or until all snubbers of that type have been functionally tested.
The representative sample selected for functional testing shall include the various configurations, operating environments and the range of size and capaci+, of snubbers.
At least 25% of the snubbers in the representative sample shall include snubbers from the following three categories:
1.
The first snubber away from ea M reactor vessel nozzle 2.
Snubbers within 5 feet of heavy equipment (valve, pump, turbine l
motor, etc.)
Snubbers within 10 feet of the discharge from a safety relief 3.
valve.
Snubbers that are especially difficult to remove or in high radiation zones during shutdown shall also be included in the representative sample."
In addition to the regular sample, snubbers which failed thr: previous functional test shall be retested during the next test period.
If a spare snubber has been installed in p? ace of a failed snubber, then both the failed snubber (if it is repaired and installed in another position) and the spare snubber shall be retested.
Test re:ults of those snubbers may not be included for the re-sampling.
- Permanent or other exemptions from functional testing for individual snubbers in these caterories may be granted by the Commission only if justifiable basis for exemption is presented and/or snubber life destructive testing was performed to qualify snubber operability for all design conditions at either the completion of their fabrication or at a subsequent date.
SEP 2 41935 SAN ONOFRE-UNIT 2 3/4 7-18 AMENDMENT NO. 33 L
PLANT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued)
If any snubber selected for functional testing either fails to lockup or fails to move, i.e., frozen in place, the cause will be evaluated and if caused by manufacturer or design deficiency all snubbers of the same type subject to the same defect shall be functionally tested.
This testing requirement shall be independent of the requirements stated in Specification 4.7.6.e. or 4.7.6.f. for snubbers not meeting the function &l test acceptance criteria.
h.
Functional Testing of Repaired and Replaced Snubbers Snubbers which fail the visual inspection or the functional test acceptance criteria shall be repaired or replaced.
Replacement snubbers and snubbers which have repairs which might affect the functional test result shall be tested to meet the functional test criteria before installation in the unit.
These snubbers shall have met the acceptace criteria subsequent to their most recent service, and the functional test must have been performed within 12 month before being installed in the unit.
i.
Snubber Service Life Monitoring A record of the service life of each snubber, the date at which the designated service life commences and the instal-lation and maintenance records on which the designated service life is based shall be naintained as required by Specification 6.10.2.1.
Concurrent with the first inservice visual inspcction and at least once per 18 months thereafter, the installation and maintenance records for each snubber shall be reviewed to t
verify that the indicated service life has not been exceeded l
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 j
shall be indicated in the records.
J.
Transient Event Inspections An inspection shall be performed of all hydraulic and mechanical l
snubbers attached to sections of safety systems that have experienced unexpected, potentially damaging transients as i
determined from a review of operational data and a visual inspection of tile systems within 6 months following a detemination that such j
an event has occurred.
In addition to satisfying the visual inspection acceptance criteria, freedom of motion of mechanical
[
l snubbers shall be verified using one of the following:
(1) manually induced snubber movement; (ii) evaluation of in-place snubber piston i
setting; (iii) stroking the mechanical snubber through its full range of travel.
SAN ON0FRE-UNIT 2 3/4 7-20 AMENOMENT NO.58 k
PLANT SYSTEMS BASES 3/4.7.6 SNUBBERS All 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.
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.
For visual inspection snubbers are categorized into two (2) groups, those accessible and those inaccessible during reactor operation.
For functional testing, snubbers are categorized into types by design and manufacturer, irre-spective of capacity.
For example, Pacific Scientific snubbers are divided into four types corresponding to different design features:
PSA 1/4 and 1/2 are one type; PSA 1, 3, and 10 are another; PSA 6 is another; and PSA 35 and 100 are a fourth type.
The visual inspection frequency is based upon maintaining a constant level of snubber protection to systems.
Therefore, the required inspection interval varies inversely with the observed snubber failures and is determined by the number of inoperable snubbers found during an inspection.
Inspections performed before that interval has elapsed may be used as a new reference point to deter-mine the next inspection.
However, the results of such early inspections per-formed 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.
To provide assurance of snubber functional reliability, a representative sample of the installed snubbers will be functionally tested during plant shut-downs at 18 month intervals.
Hydraulic snubbers and mechanical snubbers may each be treated as a different entity for the above surveillance programs.
SEP 2 4 1955 SAN ONOFRE-UNIT 2 8 3/4 7-5 AMENDMENT NO 33 L
NPT-10/15-246 ATTACHMENT "B" UNIT 2 PROPOSED SPECIFICATIONS i
l l
L
PLANT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued)
No. Inoperable Snubbers per Inspection Period Subsequent Visual,
Inspection Period
- O 20 months.t 25%
1 14 months i 25%
2 6 months t 25%
3,4 124 days 1 25%
5,6,7 62 days i 25%
8 or more 31 days i 25%
The snubbers may be categorizad into two groups: Those accessible and those inaccessible during reactor operation. Each group may be inspected independently in accordance with the above schedule.
c.
Visual Inspection Acceptance Criteria Visual inspections shall verify (1) that there are no visible indications of damage or impaired OPERABILITY,. and (2) attachments to the foundation or supporting structure are secure, and (3) fasteners for attachment of the snubber to pipe and (b) the snubber anchorage are secure. (Snubbers whicha) the comp appear inoperable as a result of visual inspections may be determined OPERABLE 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 that may be generically susceptible; and (2) the affectad snubber is functionally tested in the as found condition and determined OPERABLE per Specification 4.7.6.e or 4.7.6.f. as applicable.
However, when a fluid port of a hydraulic snubber is found to be uncovered, the snubber shall be determined inoperable and cannot be determined OPERA 8LE via functional testing for the purpose of establishing the next visual inspection interval. All l
snubbers connected to an inoperable common hydraulic fluid reservoir i
shall be counted as inoperable snubbers.
The inspection interval shall not be lengthened more than one step at a time.
9The provisions of Specification 4.0.2 are not applicable.
l l
[
SAN ONOFRE-UNIT 2 3/4 7-17 1
{
,C i
i I
PLANT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued) d.
Functional Tests i
At least once per refuelino during shutdown, a representative sample l
of at least 15% of the total of each type of snubber in use in the plant shall be functionally tested either in place or in a bench test.
For each snubber of a type that does not meet the functional test acceptance criteria of Specification 4.7.6.e or 4.7.6.f, an additional 15% of that type of snubber shall be functionally tested until no more failures are found or until all snubbers of that type have been functionally tested.
The representative sample selected for functional testing shall include the various configurations, operating environments and the range of size and capacity of snubbers.
At least 25% of the snubbers in the representative sample shall include snubbers from the following three categories:
1.
The first snubber away from each reactor vessel nozzle 2.
Snubbers within 5 feet of heavy equipment (valve, pump, turbine motor,etc.)
3.
Snubbers within 10 feet of the discharge from a safety relief valve.
Snubbers that are especially difficult to remove or in high radiation zones during shutdown shall also be included in the representative sample."
In addition to the regular sample, snubbers which failed the previous functional test shall be retested during the next test period.
If a spare snubber has been installed in place of a failed snubber, then both the failed snubber (if it is repaired and installed in another position) and the spare snubber shall be retested.
Test results of those snubbers may not be included for the re-sampling.
- Permanent or other exemptions from functional testing for individual snubbers in these caterories may be granted by the Commission only if justifiable i
basis for exemption is presented and/or snubber life destructive testing was performed to qualify snubber operability for all design conditions at either the completion of their fabrication or at a subsequent date.
]
SEP 2 4 G85 SAN ONOFRE-UNIT 2 3/4 7-18 AMENDMENT NO. 33
(
PLINT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued)
If any snubber selected for functional testing either fails to lockup or fails to move, i.e., frozen in place, the cause will be evaluated and if caused by manufacturer or design deficiency all snubbars of the same type subject to the same defect shall be functionally tested.
This testing requirement shall be independent of the requirements stated in Specification 4.7.6.e. or 4.7.6.f. for snubbers not meeting the function &l te:;t acceptance criteria.
h.
Functional Testing of Repaired and Replaced Snubbers Snubbers which fail the visual inspection or the functional test acceptance criteria shall be repaired or replaced.
Replacement snubbers and snubbers which have repairs which might affect the functional test result shall be tested to meet the functional test criteria before installation in the unit.
These snubbers shall have met the acceptace criteria subsequent to their most recent service, and the functional test must have been performed within 12 month before being installed in the unit.
f.
Snubber Service Life Monitoring A record of the service life of each snubber, the date at which the designated service life commences and the instal-lation and maintenance records on which the designated service life is based shall be maintained as required by Specification 6.10.2.1.
Concurrent with the first inservice visual inspection and at least once per refueling thereaf ter, the installation and l
maintenance records for each snubber 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 sh111 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.
J.
Transient Event Inspections An inspection shall be performed of all hydraulic and mechanical snubbers attached to sections of safety systems that have experienced unext acted, potentially damaging transients as determined from & review of operational datt and a visual inspection of the systems wit. win 6 months following a determination that such an event has occurrtd.
In addition to satisfying the visual inspection acceptance criteria, freedom of motion of mechanical snubbers shall be verified using one of the following:
(1) manually induced snubber movement; (ii) evaluation of in-place snubber piston setting; (iii) stroking the mechanical snubber through its full range of travel.
SAN ONOFRE-UNIT 2 3/4 7-20
PLANT SYSTEMS BASES
(
3/4.7.6 SNUBBERS All 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.
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.
For visual inspection snubbers 'are categorized into two (2) groups, those accessible and those inaccessible during reactor operation.
For functional testing, snubbers are categorized into types by design and manufacturer, irre-spective of capacity.
For example', Pacific Scientific snubbers are divided into four types corresponding to different design features:
PSA 1/4 and 1/2 are one type; PSA 1, 3, and 10 are another; PSA 6 is another; and PSA 35 and 100 are a fourth type.
The visual inspection frequency is based upon maintaining a constant level of snubber protection to systems.
Therefore, the requireo inspection interval varies inversely with the observed snubber failures and is determined by the number of ineperable snubbers found during an inspection.
Inspections performed before that interval has elapsed may be used as a new reference point to deter-mine the next inspection.
However, the results of such early inspections per-
[
formed before the original required time interval has elapsed (nominal time lg -
less 25%) may not be used to lengthen the required inspection interval. Any
~
ir,spection whose results require a sherter inspection interval will override the previous schedule.
To provide assurance of snubber functional reliability, a representative sample of the installed snubbers will be functionally tested during plant shut-downs at refuelingintervals, g
Hydraulic snubbers and mechanical snubbers may each be treated as a different entity for the above surveillance programs.
i l
i 7
l SAN ONOFRE-UNIT 2 B 3/4 7-5
NPF-10/15-246 ATTACHMENT "C" UNIT 3 EXISTING SPECIFICATIONS l
l l
1 l
L
i PLANT SYSTEMS 3/4.7.6 SNUBBERS LIMITING CONDITION FOR OPERATION y
3.7.6 All snubbers shall be OPERABLE.
The only 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 OPERA 8LE 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 4.7.6 g on the attached component or declare the attached system inoperable and follow the appropriate ACTION statement for that system.
SURVEILLANCE REQUIREMENTS 4.7.6 Each snubber shall be demonstrated OPERABLE by performance of the following augmcnted inservice inspection program, a.
Inspectien Types As used in this specification, type of snubber shall mean snubbers of the same design and manufacturer, irrespective of capacity.
b.
Visual Inspections The first inservice visual inspection of snubbers shall be performed after 4 months but within 10 months of commencing POWER OPERATION and shall include all snubbers.
If less than two snubbers are found inoperable during the first inservice visual inspection, the second inservice visual inspection shall be performed 12 months t 25% from the date of the first inspection.
Otherwise, subsequent visual inspections shall be performed in accordance Wth the following schedule:
No. a'noperable Snubbers Subsequent Visual per Inspection Period Inspection Period *y l
0 18 months i 25%
l 1
12 months i 25%
1 2
6 months i 25%
3,4 124 days i 25%
5,6,7 62 days t 25%
1 8 or more 31 days i 25%
l
- The inspection interval shall not be lengthened more than one step at a time.
- The provisions of Specificatior. 4.0.2 are not applicable.
SEP 2 41985 SAN ONOFRE-UNIT 3 3/4 7-17 AMENOMENT NO. 22
l PLANT SYSTEM $
$UWEILLANCE REQUIREMENTS (Continued)
The snubbers may be categorised into two groups: Those accessible
{
and those inaccessible during reactor operation.
Each group may be q
inspectad independently in accordence with the above scheduie.
j c.
Visual Inspection Acceptance Criteria Visual inspections shall verify (1) that there are no visible indica-1 tions of damage or impaired OPERA 8ILITY, and (2) attachments to the foundation or supporting structure are secure, and (3) fasteners for 3
-ttachment of the snubber to (a) the component or pipe and (b) the snubber anchorage are secure.
Snubbers which appear inoperable as a result of visual inspections may be determined OPERA 8LE for the pur-s pose of establishing the next visual inspection interval, provided tnat (1) the cause of the rejection is clearly established and re-medied for that particular snubber and for other snubbers that may be I
generically susceptible; and (2) the affected snubber is functionally a
tested in the as found condition and determined CPERA8LE per Specifi-J cation 4.7.6.e or 4.7.6.f as applicable.
However, when a fluid port o of a hydraulic snubber is found to be uncovered, the snubber shall bes i
t determined inoperable and cannot be determined OPERA 8LE via functional.
.j testing for the purpose of estao11shing the next visual inspection P
i interval.
All snubbers connected to an inoperable common hydraulic
];
fluid reservoir shall be counted as inoperable snubbers.
-4 d.
Functional Tests" j
e At leest once per 18 months during shutdown, a representative sample f
of at leact 10% of the total of each type of snubber in use in the plant shall be functionally tested either in place or in a bench test.
For each snubber of a type of that does not meet the functional J
test acceptance criteria of $pecification 4.7.6.e or 4.7.6.f, an j
additional los of that type of snubber shall be functionally tested untti no more failures are found or until all snubbers of that type have been functionally tested.
The representative sample selected for functional testing shall include the various configurations, operating environments and the range of size and capacity of snubbers.
At least 25% of the snubbers in the representative sample shall include snubbers from the following three categories:
1.
The first snubber away from each reactor vessel nozzle 2.
Snubbers within 5 feet of heavy equipment (valve, pump, turbine motor,etc.)
3.
Snubbers within 10 feet of the discharge from safety relief valve.
"Permanent or other exemptions from functional testing for individus) snubbers in these categories may be granted by the Commission only if justifiable basis for exemption is presented and/or snubber life destructive testing was performed to qualify snubber operability for all design conditions at either the completion of their fabrication or at a subsequent date.
SAN ON0FRE-UNIT 3 3/4 7-18 AMEN 0 MENT N0. 47
s PLANT SYSTEMS 6
i SURVEILLANCE RE00IREMENTS (Continued) i.
Snubber Service Life Monitoring 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 as required by Specification 6.10.2.1.
Concurrent with the first inservice visual inspection and at least once per 18 months thereafter, the installation and maintenance records for each snubber : hall be reviewed to verify that the 1
indicated service life has not been exceeded or will not be exceeded prior to the next scoeduled 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 t
[
reevaluated or the snubber shall be replaced or reconditioned so as to extend its service life beyond the date of the next scheduled k-service life review.
This reevaluation; replacement or reconditioning shall be indicated in the records.
J.
Transient Event Inspections An inspection shall be performed of all hydraulic and mechanical l
snubbers attached to sections of safety systems that have i
experienced unexpected, potentially damaging transients as determined from a review of operational data and a visual inspection of the systems within 6 months following a deter.afnation that such an event has occurred.
In addition to satisfying the visual inspection acceptance criteria, freedom of motion of mechanical i
snubbers shall be verified using one of the folleving:
(i) manually induced snubber movement; (ii) evaluation of in place snubber piston setting; (iii) streking the nechanical snubber through its full range of travel.
l l
SAN ONOFRE-UNIT 3 3/4 7-21 AMENOMENT NO. 47 pa w,---,--m-,--
nn-,.
,,, ~,, - -
,, ~,, -, _.. _ _ - _ _ _ _ _ _ - - _ _ _ _ _ _. _ _ _ _ _ - - - - -
PLANT SYSTEMS BASES 3/4.7.6 SNUBBERS All 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.
Snubbers excludad from this inspection program are those installed on nonsafety related syster.a 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.
For visual inspection snubbers are categorized into two (2) groups, those accessible and those inaccessible during reactor operation.
For functional testing, snubbers are categorized into types by design and manufacturer, irrespective of capacity.
Fnr example, Pacific Scientific snubbers are divided into four types corresponding t' different design features:
PSA 1/4 and 1/2 are one type; PSA 1, 3, and 10 are another; PSA 6 is another; and PSA 35 and 100 are a fourth type.
The visual inspection frequency is based upon maintaining a constant level of snubber protection to systems.
Therefore, the required inspection interval varies inversely with the observed snubber failures and is determine:d by the number of inoperable snubbers found during an inspection.
Inspections performed before that interval has elapsed may be used as a new reference point to determine the rext inspection.
However, the results of such early inspections performed before the original required time interval has elapsed (nominal time less 25%) may not be used tn lengthen the required inspection interval.
Any inspection whose results require a shorter inspection interval will override the previous schedule.
To provide assurance of snubber functional reliability, a representative sample of the installed snubbers will be functionally tested during plant shutdowns at 18 month intervals.
Hydraulic snubbers and mechanical snubbers ma ferent entity for the above surveillance programs.y each be treated as a dif-SEP 2 4 E SAN ONOFRE-UNIT 3 8 3/4 7-5 AMENDHENT NO. 22
6 NPF-10/15-246 ATTACHMENT "D" UNIT 3 PROPOSED SPECIFICATIONS 1
l l
l l
l l
l
PLANT SYSTEMS 3/4.7.6 SNUBBERS LIMITING CONDITION FOR OPERATION 3.7.6 All snubbers shall be OPERABLE.
The only 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 adver:e effect on any safety-related system.
APPLICABILITY:
H0 DES 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 4.7.6.g on the attached component or declare the attached system inoperable and follow the appropriate ACTION statement for that system.
SURVEILLANCE REQUIREMENTS
- 4. L cach snubber shall be demonstrated OPERABLE by performance of the following augmented inservice inspection program, a.
Inspection Types As used in this specification, type of snubber shall mean snubbers of the same design and manufacturer, irrespective of capacity, b.
Visual Inspections The first inservice visual inspection of snubbers shall be performed after 4 months but within 10 months of commencing POWER OPERATION and l' -
shall include all snubbers.
If less than two snubbers are found inoperable during the first intervice visual inspection, the second i
inservice visual inspection shall be porformec' 12 months i 25% from the date of the first inspection.
Otherwise, subsequent visual I
inspections shall be performed in accordance with the following schedule:
No. Inoperable Snubbers Subsequent Visual,
per Inspection Period Inspection Period
- O 20 months i 25%
1 14 months i 25%
l 2
6 months i 25%
3,4 124 days i 25%
5,6,7 62 days 1 25%
8 or more 31 days i 25%
rThe inspection interval shall not be lengthened more than one step at a time.
l
- The provisions of Specification 4.0.2 are not applicabl-SAN ONOFRE-UNIT 3 3/4 7-17 1
L
4 1
l
- LANT Sf$TEMS
~
SURVEILLANCE REQUIAEMENT$ (Continued) j y
The snubbers may be categorized into two groups: Those accessible and those inaccessible during reactor operation.
Each group may be inspected independently in accordance with the above schedule.
j c.
Visual Inspection Acceptance Criteria l
Visual inspections shall verify (1) that there are no visible indica-l tions of damage or impaired OPERASILITY, and (2) attachments to the
{
foundation or supporting structure are secure, and (3) fasteners for l
attachment of the snubber to (a) the component or pipe and (b) the snubber anchorage are secure.
Snubbers which appear inoperable as a i
result of visual inspections may be determined OPERA 8LE for the pur-l pose of establishing the next visual inspection interval, provided j
l that (1) the cause of the rejection is clearly established and re-medied for that particular snubber and for other snubbers that may be generically susceptible; and (2) the affected snubber is functionally.
j tested in the as found condition and determined CPERA8LE per Specifi-e cation 4.7.6.e or 4.7.6.f, as applicable.
However, when a fluid portf c.
{
of 2 hydraulic snubber is found to be uncovered, the snubber shall bei" determined inoperable and cannot be determined OPERA 8LE via functionah a
l testing for the purpose of establishing the next visual inspection E
j interval.
All snubbers connected to an inoperable common hydraulic 4 fluid reservoir shall be counted as inoperable snubbers.
_4 i_
j j
d.
Functional Tests" At least once per refueling during shutdown, a representative sample l
1 of at least 15s of the total of each type of snubber in use in the j
plant shall be functionally tested either in place or in a bench test.
For each snubber of a type of that does not meet the functional test acceptance criteria of Specification 4.7.6.e or 4.7.6.f, an additional ist of that tyoe of snubber sha11 be functionally tested until no more failures are found or until all snubbers of that type have been functionally tested.
The representative sample selected for functional testing shall include the various configurations, operating environments and the range of size and capacity of snubbers.
At least 25% of the snubbers in the representative sample shall include snubbers from the following three categories:
1.
The first snubber away from each reactor vessel nozzle 2.
Snubbers within 5 feet of heavy equipment (valve, pump, turbine motor,etc.)
3.
Snubbers within 10 feet of the discharge from safety relief valve.
~
"Permanent or other exemptions from functional testing for individual snubbers in these categories may be granted by the Commission only if justifiable basis for exemption is presented and/or snubber life destructive testing was performed to qualify snubber operability for all design conditions at either the completion of their fabrication or at a subsequent date.
SAN ON0FRf-UNIT 3 3/4 7-18
.o i
PLANT SYSTEMS s
I SURVEILLANCE REQUIREMENTS (Continued) i.
Snubber Service Life Monitoring 1
i A record of the service life of each snubber, the date at which the designated service life commences,and the installation and saintenance records on which the designated service life is based shall be maintained as required by Specification 6.10.2.1.
Concurrent with the first inservice visual inspection and at least once per refueling thereafter, the installation and maintenance records for each snubber 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 t
indicated service life will be exceeded prior to the next scheduled l
snubber service life review, the snubber service life shall be
{
l raevaluated 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 j
e reconditioning shall be indicated in the records.
{
j.
Transient Event Inspections An inspection shall be performed of all hydraulic and mechanical snubbers attached to sections of safety systems that have experienced unexpected, potentially damaging transients as determined from a review of operational data and a visual inspection of the systees within 6 months following a determination that such an event has occurred.
In addition to satisfying the visual inspection acceptance criteria, freedom of motion of mechanical snubbers shall be verified using one of the following:
(1) manually i
induced snubber movement; (ii) evaluation of in place snubber piston setting; (iii) stroking the mechanical snubber through its full range of travel.
I I
SAN ONOFRE-UNIT 3 3/4 7-21 1
L
o.
PLANT SYSTEMS BASES 3/4.7.6 SNUBBERS All 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.
Snubbers excluded from this inspection program are those installed on nonsafety related systems and then only if their failure or failure of the related system. system on which they are installed, would have no adverse effect on an For visual inspection snubbers are categorized into two (2) groups,' those accessible and those inaccessible during reactor operation.
For functional testing, snubbers are categorized into types by design and manufacturer, irrespective of capacity.
For example, Pacific Scientific snubbers are divided into four types corresponding to different design features:
35 and 100 are a fourth type.and 1/2 are one type; PSA 1, 3, and 10 are an PSA 1/4 The visual inspection frequency is based upon ma.ntaining a constant level of snubber protection to systems.
Therefore, the required inspection interval varies inversely with the observed snubber failures and is determined by the number of inoperable snubbers found during an inspection.
Inspections W
performed before that interval has elapsed may be used as a new reference point to determine the next inspection.
However, the results of such early inspections performed before the original required time interval has elapsed (nominal time less 25%) may not be used to lengthen the required inspection interval.
will override the previous schedule.Any inepection whose results require a shorter To provide assurance of snubber functional reliability, a representative sample of the installed snubbers will be functionally tested during plant shutdowns at refuelingintervals.
l Hydraulic snubbers and mechanical snubbers ma ferent entity for the above surveillance programs.y each be treated as a dif-4 l
l l
l SAN ONOFRE-UNIT 3 8 3/4 7-5 L
i