ML20128E151
| ML20128E151 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 06/28/1985 |
| From: | COMMONWEALTH EDISON CO. |
| To: | |
| Shared Package | |
| ML20128E131 | List: |
| References | |
| 0307K, 307K, NUDOCS 8507050268 | |
| Download: ML20128E151 (20) | |
Text
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ATTACHENT 1 PROPOSED ZION APPENDIX A TECHNICAL SPECIFICATION CHANGES TO SECTIONS 3.22, 4.22, and 6.5 SHOCK SUPPRESSORS (SNUBBERS)
Pages Modified Pages Added iv 295 AAl 295W 295 AA2 295X 295 AA3 295Y 295 AAA 295Z 295 AA5 295AA 295 AA6 315 295 AA7 295 AA8 295 AA9 4
0307K 8507050268 850628 PDR ADOCK 05000295 P PDR
- , . . . ______ _-. _ . ._. . . _ . . _ ~ . - _ _ , _ _ . ._
SURVEllLANCE LIMITING CONDITION FOR OPERATION REQUIREMENT PAGE 3.13 Refueling Operations 4.13 243 3.13.1 Core Reactivity , 4.13.1 .
243 .
3.13.2 Protection from Damaged Spent Fuel 4.13.2 # 244 3.13.3 Containment Status 4.13.3 245
- 3.13.4 Radiation Monitoring 4.13.4 246 3.13.5 Refueling Equipment Checkout 4.13.5 246 3.13.6 Refueling Equipment Operability 4.13.6 246' 3.13.7 Spent Fuel Pit Cooling Systems 4.13.7 246
- 3.13.8 Fuel Inspection Program 4.13.8 247 3.13.9 Residual Heat Removal System Operation 247c 3.13.10 Water Level - Reactor Vessel 247d i 3.13.11 Water Level - Storage Pool 4.13.9 247a s Bases 248 i 3.14 Plant Radiation Mc-itoring 4.14 250 Bases 254 i
3.15 Auxiliary Electrical Power System 4.15 255 I
Bases 271
] 3.16 Radiological Environmental Monitoring 4.16 275 i Bases 279 j 3.17.1 Ventilation 4.17.1 281 3.17.2 Aircra(t Fire Detection 4.17.2 283 l Bases 287 l 3.18 Steam Generator Activity 4.18 289 l Bases 290 1 3.19 Failed fuel Monitoring 4.19 292 Bases 293 3.20 Deleted l 3.21 Fire Protection 4.21 295D
] Bases 2950 3.22 Shock Suppressors (Snubbers) 4.22 295W 3.22.1 Mechanical Snubbers .
4.22.1 295W 3.22.2 Hydraulic Snubbert 4.22.2 295AA1 3.22.3 Snubber Service Life Monitoring 4.22.3 295AA7
! Bases 295AA8 -
l 3.23 Special Test Exceptions 4.23 295AB
.; Bases 295AC l
TABLE OF CONTENTS (Continued) l iv i 0872t i
LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENT .
o 3.22. Shock Suppressors (Snubbers) 4.22. Shock Suppressors (Snubbers)
- 1. Mechanical Snubbers 1. Mechanical Snubbers A. All safety related mechanical A. Each mechanical snuhber shall be snubbers listed in station demonstrated OPERABLE by performance of the procedures shall be OPERABLE. following augmentec inservice inspection program.
APPLICABILITY: MODES 1,2,3,4 and 7 1. Visual Inspection - Mechanical Snubbers (MODES 5 and 6 for snubbers located The visual inspection shall be on systems required OPERABLE in performed in accordance with the those MODES.) following schedule.
No. Inoperable Snubbers Subsequent Visual ACTION: per Inspection Period Inspection Period *#
0 18 months i 25%
With one or more snubbers inoperable, within 1 12 months i 25%
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 2 6 months 1 25%
snubber (s) to OPERABLE status and perform an 3,4 124 days i 25%
engineering evaluation per Specification 5,6,7 62 days i 25%
4.22.1.A.3 on the supported component or 8 or more 31 days 1 25%
declare the supported system inoperable and follow the appropriate ACTION statement for The snubbers may be categorized into that system. two groups: Those accessible and those inaccessible during reactor operation.
Each group may be inspected independently in accordance with the above schedule.
-
- The inspection interval shall not be lengthened more than one step at a time.
- The provisions of Specification 4.0.2 are not applicable.
0853t/0854t 295W
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s LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENT , 4.22.1.A.
- 2. Visual Inspection Acceptance Criteria -
Mechanical Snubbers Visual inspections shall verify (1) that there are no visible indications of damage or impaired OPERABILITY, (2) attachments to the foundation or supporting structure are secure, and (3) in those locations where snubber movement can be manually induced without disconnecting the snubber, that the snubber has freedom of movement and is not frozen up. Snubbers which appear inoperable as a result of visual inspections may be determined OPERABLE for the purpose of establishing the next visual inspection interval, providing 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 affected snubber is functionally tested in the as found condition and determined OPERABLE.
- 3. Functional Tests - Mechanical Snubbers At least once per 18 months during shutdown, a representative sample (10% of the total of each type of snubber.in use in the plant) shall be functionally tested eitner in place or in a bench test. For each snubber that does not meet the functional test acceptance criteria of Specification 4.22.1.A.4, an
- additional 10% of that type of snubber shall be
,0853t/0854t 295X
LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENT , 4.22.1.A.3. (Continued) 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:
- a. The first snubber away from each .
reactor vessel nozzle
- b. Snubbers within 5 feet of heavy equipment (valve, pump, turbine, motor, etc.)
- c. 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.*
- 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.
0853t/0854t 295Y
LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENT .
4.22.1.A.3. (Continued)
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 these snubbers may not be included for the re-sampling.
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 design subject to the same defect shall be functionally tested. This testing requirement shall be independent of the requirements stated above for snubbers not meeting the functional test acceptance criteria.
1
. For the snubber (s) found inoperable, an engineering evaluation shall be performed on the components which are supported by the snubber (s). The purpose of this engineering evaluation shall be to determine if the components supported by the snubber (s) were adversely affected by the inoperability of the snubber (s) in order to ensure that the supported component remains capable of meeting the designed service.
0853t/0854t 295Z
LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENT , 4.22.1.A. (Continued)
- 4. Functional Test Acceptance Criteria -
Mechanical Snubbers The mechanical snubber functional test shall verify that:
- a. The force that initiates free movement of the snubber rod in either tension or compression is less than the specified maximum drag force. Drag force shall not have increased more than 50% since the last functional test.
- b. Activation (restraining action) is achieved within the specified range of velocity or acceleration in both tension and compression.
- c. Snubber release rate, where required, is within the specified range in compression or tension. For snubbers specifically required not to displace under continuous load, the ability of the snubber to withstand load without displacement shall be verified.
9 1
0853t/0854t 295AA
LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENT .
3.22. Shock Suppressors (Snubbers) (Continued) 4.22. Shock Suppressors (Snubbers)
- 2. Hydraulic Snubbers 2. Hydraulic Snubbers A. All safety related hydraulic A. Each hydraulic snubber shall be demonstrated snubbers listed in station OPERABLE by performance of the following procedures shall be OPERABLE. augmented inservice inspection program.
- 1. Visual Inspections - Hydraulic Snubbers APPLICABILITY: MODES 1,2,3,4 and 7 All hydraulic snubbers shall be (MODES 5 and 6 for snubbers located visually inspected in accordance with on systems required OPERABLE in the following schedule:
those MODES.)
No. Inoperable Snubbers Subsequent Visual per Inspection Period Inspection Period *#
ACTION: 0 18 months 1 25%
1,2 12 months 1 25%
With one or more snubber,s inoperable, within 3,4 6 months 1 25% '
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 5-8 124 days 1 25%
snubber (s) to OPERABLE status and perform an 9-14 62 days 1 25%
engineering evaluation per Specification 15,16 31 days 1 25%
4.22.2.A.3 on the supported component or declare the supported system inoperable and The snubbers may be categorized into follow the appropriate ACTION statement for -
two groups: Those accessible and those that system. inaccessible during reactor operation.
Each group may be inspected independently in accordance with the above schedule. ,
- The inspection interval shall not be lengthened more than one step at a time.
- The provisions of Specification 4.0.2 i are not applicable.
I 1
l0853t/0854t 295AA1 ,
~
LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENT .
4.22.2.A. Hydraulic Snubbers (Continued)
- 2. Visual Inspection Acceptance Criteria -
Hydraulic Snubbers Visual inspection shall verify (1) that there are no visible indications of damage cr impaired OPERABILITY, (2) attachments to the foundation or supporting structure are secure, and (3) in those locations where snubber movement can be manually induced without disconnecting the snubber, that the snubber has freedom of movement and is not frozen up. Snubbers which appear inoperable as a result of visual inspections may be determined OPERABLE for the purpose of establishing the next visual inspection interval, providing 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 (21 the affected snubber is functionally tested in the as found condition and determined OPERABLE. However, when the fluid port of a hydraulic snubber is
/ found to be uncovered, the snubber shall be determined inoperable and cannot be determined OPERABLE via functional testing for the purpose of establishing the next visual inspection interval. All snubbers connected to an inoperable common hydraulic fluid reservoir shall be counted as inoperable snubbers.
0853t/0854t . 295AA2
LIMITING CONDITIONS FOR OPERATION -
SURVEILLANCE REQUIREMENT ,
. 4.22.2.A. (Continued)
Once each refueling cycle, a representative sample of at least 10 hydraulic snubbers shall be functionally tested for operability including verification of proper piston movement, lock up and bleed. For each t unit and subsequent unit found inoperable, an additional ten snubbers shall be so tested until no more failures are found or all units have been tested.
The representative sample selected for i functional testing shall include the various configurations, operating environments and the range of size and f capacity of snubbers. At least 25% of the snubbers in the representative sample shall include snubbers from the following three categories:
- a. The first snubber away from each reactor vessel nozzle.
j b. Snubbers within 5 feet of heavy equipment (valve, pump, turbine, motor, etc.)
- c. Snubbers within 10 feet of the discharge from a safety relief valve.
0853t/0854t 295AA3 l
4
LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENT , 4.22.2.A.3. (Continued)
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 i both the failed snubber (if it is repaired and installed in another position) and the spare snubber
, shall be retested. Test results of I these snubbers may not be included for the re-sampling.
t 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 i manufacturer or design deficiency all snubbers of the same design subject to the same defect shall be functionally tested. This testing requirement shall be independent of the requirements stated above for snubbers not meeting the functional test acceptance criteria.
l For the snubber (s) found inoperable, an engineering evaluation shall be performed on the components which are supported 0853t/0854t 295AA4
LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENT .
. 4.22.2.A.3. (Continued) by the snubber (s). The purpose of this engineering evaluation shall be to determine if the components supported by the snubber (s) were adversely affected by the inoperability of the snubber (s) in order to ensure that the supported component remains capable of meeting the designed service.
- Permanent or other exemptions from functional testing for individual snubbers in these categories may be granted by the Commission only if a 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.
! Testing Once each refueling cycle, a representative sample of at least 1 1.arge Bore Hydraulic Snubber shall be functionally tested for operability including verification of proper piston movement, lock up and bleed.
large bore hydraulic snubbers have rated full
! load capacity of greater than 50,000 lbs.
I I The representative sample selected for
! functional testing shall be a different steam
! generator snubber than has been previously l functionally tested during this testing cycle.
0853t/0854t 295AAS
LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENT , 4.22.2.A.4. (Continued)
For snubber (s) found inoperable, an engineering evaluation shall be performed on components which are supported by the snubber (s). The purpose of the engineering evaluation shall be to determine if the components supported by the snubber (s) were adversely affected by the inoperability of the snubber (s) in order to ensure that the supported component remains capable of meeting the designed service.
For each unit and subsequent unit found inoperable, an additional two snubbers shall be so tested until no more failures are found or all units have been tested.
- 5. Functional Test Acceptance Criteria -
Hydraulic Snubber The hydraulic snubber functional test shall verify that:
- 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 tension. ,For snubbers specifically required to not displace under continuous load,the ability of the snubber to withstand load without displacement shall be verified.
0853t/0854t 295AA6
c>
LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENT .
C 4.22. Shock Suppressors (Continued) 4.22. Shock Suppressors (Continued)
- 3. Snubber Service Life Monitoring 3. Snubber Service Life Monitoring A record of the service life of each mechanical and hydraulic snubber, the date at which 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 6.5.B.16 Concurrent with the first inservice visual inspection and at least once per 18 months 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 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.
i 0853t/0854t 295AA7
i l Bases: 3.22 & 4.22
{ Snubbers are designed to prevent unrestrained The inspection frequency is based upon ipipe motion under dynamic loads as might occur maintaining a constant level of snubber iduring an earthquake or, for some snubbers, protection. Thus the required inspection
. severe transients, while allowing normal thermal interval varies inversely with the observed
- motion during startup and shutdown. The snubber failures. The number of inoperable
! consequences of an inoperable snubber is an snubbers found during a required inspection l increase in the probability of structural damage determines the time interval for the next
!to piping as a result of a seismic event or, for required inspection. Inspections performed
- some snubbers, other events initiating dynamic before that interval has elapsed may be used as a i ioads. It is therefore required that all new reference point to determine the next isnubbers required to protect the primary coolant inspection. However, the results of such early l system er any other safety system or component be inspections perforned before the original lcparable during reactor operation. required time interval has elapsed (nominal time J less 25%) may not be used to lengthen the l Because the snubber protection is required required inspection interval. Any inspection jonly during low probability events, a period of whose results require a shorter inspection j72hoursisallowedforrepairsorreplacements. interval will override the previous schedule.
- In case a shutdown is required, the allowance of 14 hours1.62037e-4 days <br />0.00389 hours <br />2.314815e-5 weeks <br />5.327e-6 months <br /> to reach hot shutdown is consistent with To further increase the assurance of snubber lstandardoperatingprocedures. After a maximum reliability, functional tests should be performed jef 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> in hot shutdown, 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> is allowed once each refueling cycle. These tests will to reach cold shutdown conditions. Since plant include stroking of the snubbers to verify proper
- startup should not commence with knowingly piston movement, lockup and bleed. Ten snubbers <
l def ective saf ety-related equipment, represents an adequate sample for such tests.
Specifications 3.22.1 and 3.22.2 prohibit startup Observed failures on these samples should require lwith inoperable snubbers. testing of additional units. To minimize
, personnel exposures, snubbers installed in high j All safety related hydraulic snubbers are radiation zones during reactor shutdown or in
- visually inspected for overall integrity and especially difficult to remove locations may be ioperability. The inspection will include exempted from these functional testing iverification of proper orientation, adequate requirements provided a permanent exemption is jhydraulic fluid level and proper attachment of obtained from the Commission. -
snubber to piping and structures.
4 0
4
!0853t/0854t 295AAB i
J
> Ba:as: 3.22 & 4.22 (Continued)
Experience at operating facilities has shown Snubbers may be added to safety related that the' required surveillance program should systems without prior license ammendment provided assure an acceptable level of snubber performance they are added to station procedures and provid:d that the seal materials are compatible documented in accordance with 10 CFR 50.59.
with the operating environment.
Hydraulic snubbers and mechanical snubbers Snubbers containing seal material which has may each be treated as a different entity for the t not been demonstrated by operating experience, above surveillance programs.
lab tests or analysis to be compatible with the cparating environment should be inspected more The service life of a snubber is evaluated frequently (every month) until materials via manufacturer input and information through compatibility is confirmed or an appropriate consideration of the snubber service conditions
- chang
- out is completed. and associated installation and maintenance records (newly installed snubber, seal replaced, Examination of defective snubbers at reactor spring replaced, in high radiation area, in high facilities and material tests performed at temperature area, etc...). The requirement to sev:ral laboratories (Reference 1) has shown that monitor the snubber service life is included to millable gum polyurethene deteriorates rapidly ensure that the snubbers periodically undergo a under the temperature and moisture conditions performance evaluation in view of their age and present in many snubber locations. Although operating conditions. These records will provide i mold:d polyurethene exhibits greater resistance statistical bases for future consideration of to these conditions, it also may be unsuitable snubber service life. The-requirements for the
< for application i~n the higher temperature maintenance of records and the snubber service environments. Data are not currently available life review are not intended to affect plant to precisely define an upper temperature limit operation.
fer the molded polyurethene. Lab tests and l in-plant experience indicate that seal materials
- are available, primarily ethylene propylene.
(1) Report H. R. Erickson, Bergen Paterson to K. R. Goller, NRC, October 7, 1974 0853t/0854t 295AA9
6.5 Records (Continued)
- 8. Records and/or logs relative to the 10. Records of transient or operational following items shall be recorded in a cycling for those components that have manner convenient for review and shall been designed to operate safely for a be retained for the life of the plant. limited number of transient or operational cycles.
- 1. Substitution or replacement of principal items of equipment 11. Records of individual qualifications, pertaining to nuclear safety. experience, training and retraining.
- 2. Changes made to the plant as it is 12. Inservice inspections of the reactor described in the Safety Analysis coolant system.
Report.
- 13. Minutes of meetings and results of
- 3. Records of new and spent fuel reviews performed by the off-site and inventory and assembly histories. or.-site review functions.
- 4. (Deleted) 14. Records of secondary water sampling and water quality.
- 5. Updated, corrected, and as-built drawings of the plant. 15. Records for Environmental Qualification which are covered under the provisions
- 6. Records of plant radiation and of paragraph 6.6.3.d.
contamination surveys.
- 16. Records of the service lives of all
- 7. Records of off-site environmental snubbers covered by Specification 3.22 monitoring surveys. including the date at which the service life commences and associated
- 8. Records of radiation exposure for installation and maintenance records.
all plant personnel, including all contractors and visitors to the plant in accordance with 10 CFR 20.
- 9. Records of radioactivity in liquid and gaseous wastes released to the environment.
0853t/0854t 315
ATTACHMENT 2 Evaluation of Significant Hazards Consideration Proposed Changes to Zion Appendix A Technical Specifications Sections 3.22, 4.22, 6.
5.8 DESCRIPTION
OF AENDENT REQlEST An amendment to Facility Operating License Nos. DPR-39 and DPR-48 is proposed to modify Section 3.22, 4.22, and 6.5.8 of the Technical Specifica-tions. These changes are being submitted in order to convert these sections to the Standardized Technical Specification's (STS) content.
The attached table summarizes the proposed changes, the present i 6 cal Specifications, and the Standardized Technical Specifications.
Nou; that in all categories, with the exception of hydraulic snubber visual inspection and functional testing, the proposed Technical Specifications will impose additional restrictions that are not included in the present Technical Specifications.
While the proposed programs for hydraulic snubber visual inspections and functional testing have not been significantly altered, the acceptance criteria for these activities have been more closely defined. Thus, these constraints also constitute an additional control not included in the present Technical Specifications.
Basis for Proposed No Significant Hazards Consideration Determination The Commission's examples of actions involving no significant hazards consideration (48 FR 14870) include:
(ii) a change that constitutes an additional limitation, restriction, or control not presently included in the technical specifications: for example, a more stringent surveillance requirement.
As discussed above, the changes to Sections 3.22, 4.22 and 6.5.8 all involve addition restrictions or controls that are not included in the present Technical Specifications. Thus, these changes fit example (ii).
Since the application for amendment involves proposed changes that are similar to examples for which no significant hazards consideration exist, Commonwealth Edison has made a proposed determination that the proposed amendment involves no significant hazards consideration.
0307K
Standara zMJ ProWdliom Reasoli To1F Prc.sent Zion Technical Specifications Technical Specificctions Technical Specifications Diffcrenca KEY TOPICS From STS .
(ZTS) (STS)
Failurus Inspection Int. Failur_s Insp;ction Int.
Mechanical snubbers !l Mechanical snubbers not
- No Difference Visual Inspections. ( ressed in present f 1 m t ts 5%
2 6 months 125% 2 6 months 125%
3,4 124 days + 25% 3,4 124 days + 25%
5,6,7, 62 days T 25% 5,6,7, 62 days T 25%
8,+ 31 days 8,+ 31 days 125%
125%'
10% of each type of 35 10% of each type once Mechanical snubbers Mechanical snubbers not per 18 months. More functional testing addressed in present [1 + c/2], once per N D erence ZTS. 18 months. More snubbers snubbers tested if tested if failures, failures Failures Inspection Int. Failures inspection int.
Failures Inspection Int. Zion has im-Hydraulic snubbers l 0,1,2 12 months + 25% 0 18 months + 25% , 0 18 months + 25% plemented a visual inspections.
3,4 6 months + 25% 1 12 months T 25% 1,2 12 months T 25% prevenative 5,6,7,8 124 days T 25% 2 6 months T 25% 3,4 6 months T 25% maintenance pro-62 days T 25% 3,4 124 days T 25% 5,6,7,8 124 days T 25%
gram in which 9-14 15,16 31 days T 25% 5,6,7, 62 days T 25% 9-14 62 days T 25%
8,+ 31 days 125% 15,16 31 days 125% febu t on -7 year basis. Zion 10% of each type or 10 snubbers per 18 must rebuild Hydraulic snubbers 10 snubbers per re-functional testing. fyeling. More snubbers 35 [1 + c/2], once per months. More snubbers approx. 100 tested if failures. 18 months. More snubbers tested if failures. snubbers per tested if failures. outage. After the overhaul each snubber is verified operable.
Addition of Mechanical snubbers not ;I Mechanical and Hydraulic Mechanical and Hydraulic Zion has a small addressed in present '
snubbers grouped snubbers have separate mechanical mechanical snubbers I snubber popula-to technical ZTS. together. visual and functional testing criteria. tion when specification. compared to the hydraulic snubber population.
i Pr sc.nt Zirn Standardizf.d Prop".srd Zion Reason for ,
KEY TOPICS Technical Specifications Technical Specifications T:chnical Specifications Differ;:.nco (ZTS) (STS) From STS Functional testing , Exempt from testing. No exemption. Zioi will functional No Difference of snubbers with test one large bore rated capacity ;> steam generator per 50,000 lb
- F
- f" II"9' Service life Service life monitoring Requires service life Requires service life No Difference monitoring. not addressed in present monitoring. monitoring.
ZTS.
0307K