ML20073H937

Proposed Tech Specs Incorporating Generic Ltr 90-09

ML20073H937
Person / Time
Site:	Limerick
Issue date:	04/30/1991
From:	PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
Shared Package
ML20073H901	List: ML20073H897 ML20073H937
References
GL-90-09, GL-90-9, NUDOCS 9105070315
Download: ML20073H937 (10)

Text

. - _ __ _ _ _-_

. PLANT SYSTEMS 3/4.7.4 SNUBBERS LIMITING CONDITION FOR OPERATION 3.7.4 All snubbers shall be OPERABLE.

APPLICABILITf: OPERATIONAL CONDITIONS 1, 2, and 3. OPERATIONAL CONDITIONS 4 and 5 for snubbers located on systems required OPERABLE in tnose OPERATIONAL CONDITIONS.

ACTION:

With one or more snubbers inoperable on any system, 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 4.7.49 on th0 attached component or declare the attached system inoperable and follow the appropriate ACTION statement for that system.

SURVEILLANCE REQUIREMENTS 4.7.4 Each snubber shall be demonstrated OPERABLE by performance of the following augmented inservice inspection program and the requirements of Specification 4.0.5.

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 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 4.7.4-1. The visual inspection interval for each type of snubber shall be determined based upon the criteria provided in Table 4.7.4-1 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 (NRC will include the nt.mber of the license amendment that implements this change).

LIMERICK - UNIT 1 3/4 7-11 9105070315 910430 2 )

PDR ADOCK 050 1 P

TABLE 4.7.4-1 SNUB 8ER VISUAL INRTT6N INTERVAL NUMBER Of UNACCEPTABl.E SNUBBERS Population Column A Column 8 Column C

.or Category- Extend Interval Repeat Interval -Reduce Interval (Notes 1 and 2) (Notes 3 and 6) (Notes 4 and 6) (Notes 5 and 6) 1 0 0 1 80 0 0 2 100 0 1 4 150 0 3 8 200 2 5 13 300 5 12 25 400 8 18 36 500 12 24 48 750 20 40 78 1000 or greater 29 56 109 Note 1: The next visual inspection interval for a snubber population or category size shall be determined based upon the previous inspection interval and the number of unacceptable snubbers found during that interval. Snubbers may be categorizeJ, based upon their accessibility during power operation, as-accessible or inaccessible.

l These catergories may be examined separately or jointly. However, l

the licensee must make and document that decision before any inspection and shall use that decision as the basis upon which to

! determine the next inspection interval for that category, l

l Note 2: Interpolation between population or category sizes and the number of unacceptable snubbers is permissible. Use next lower integer for the value of the limit for Columns A, B, or C if that integer includes a fractional value of unacceptable snubbers as determined by interpolation.

Note 3: -If the number of unacceptable snubbers is equal to or less than the l

number in Column A, the next inspection interval may be twice the previous interval but not greater than 48 months.

Note 4: If the number of unacceptable snubbers is equal to or less than the number in Column B but greater than the number in Column A, the next inspection interval shall be the same as the previous interval.

LIMERICK - UNIT 1 3/4 7-Ila

TABLE 4.7.4-1 (continued)

SNUBBER VISUAL INSPECTION INTERVAL Note 5: If the number of unacceptable snubbers is equal to or greater than the number in Column C, the.next inspection interval shall be two-thirds of the previous interval. However, if the number of unacceptable snubbers is less than the number in Column C but greater than the number in Column B, the next interval shall be reduced proportionally by interpolation, that is, the previous interval shall be reduced by a factor that is one-third of the ratio of the difference between the number of unacceptable snubbers found during the previous interval and the number in Column B to the difference in the numbers in Columns B and C.

Note 6: The provisions of Specification 4.0.2 are applicable for all inspection intervals up to and including 48 months.

l l

I LIMERICK - UNIT 1 3/4 7-llb l

a

. PLANT-SYSTEMS- -!

i SURVEILLANCEREQUIREMENTS(Continued)

c. Visual Inspection Acceptance Criteria-Visual inspections she.11 verify'(1) that there are no visible indications of-damage or impaired OPERAB'.LITY, (2) attachments to the foundation or

supporting structure are secure, and (3) fasteners:for_ attachment of the snubber to.the component and to the snubber anchorage are secure.

Snubbers which-appear inoperable as.a result of visual inspections shall Ebe classified as eacceptable_and~may be reclassified acceptable 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 irrespective of. type on that_-system.that may be generically susceptible; and/or (2) the:  !

affected-snubber is' functionally-tested in the as found. condition-and

--determined-0PERABLE per Specifications 4.7.4f. For those snubbers common to more,than one system, the OPERABILITY of such snubbers shall be-

. considered in assessing the surveillance schedule for each of the related J systems..=A rev_lew and evaluation shall be performed and documented to justify continued operation with an unacceptable snubber. If. continued operation cannot be~ justified, the snubber shall be declared inoperable and_the ACTION: requirements shall oe met.

. ~d . Transient Event inspection-1

-An inspection shall-be performed of all snubbers attached to sections of systems that have' experienced l unexpected, potentially damaging .

l

transients, as determined from a review of operational data or a visual

inspection of the systems, within 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />s-for accessible systems and 6 w months

for inaccessible' systems following:this determination. In'

._ addition to satisfying the visual inspection acceptance criteria, freedom-of-motion of mechanical snubbers shall-be verified using at least one of the following: (1) manually . induced snubber movement: or-(?)

-evaluation of in-place snubber piston setting; or.(3)-stroking the l' mechanical snubber through its full range of travel.

-l 4

LIMERICK - UNIT 1 3/4 7-12

. PLANT SYSTEMS BASES 3/4.7.4 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.

Snubbers are classified and grouped by design and manufacturer but not by size. For example, mechanical snubbers utilizing the same design features of the 2-kip, 10-kip, and 100-kip capacity manufactured by Company "A" are of the same type. The same design mechanical snubbers manufactured oy Company "8" for the purposes of this Technical Specification would be of a different type, as would hydraulic snubbers from either manufacturer.

A list of individual snubbers with detailed information of snubber location and size and of system affected shall be available at the plant in accordance with Section 50.71(c) of 10 CFR Part 50. The n cessibility of each snubber shall be determined and approved by the Plant Operations Review Committee. The determination shall be based upon the existing radiation levels and the expected time to perform a visual inspection in each snubber location as well as other factors associated with accessibility during plant operations (e.g., temperature, atmosphere, location, etc.), and the recommendations of Regulatory Guides 8.8 and 8.10. The addition or deletion of any snubber shall be made in accordance with Section 50.59 of 10 CFR Part 50.

The visual inspection schedule is based on the number of unacceptable snubbers found during the previous inspection in proportion to the sizes of the various snubber populations or categories. The visual inspection interval is based on a fuel cycle of up to 24 months and may be as long as two fuel cycles or 48 months depending on the number of unacceptable snubbers found during the previous visual inspection. The visual inspection schedule provides confidence that a constant level of snubber protection is being maintained and generally allows performance of visJal inspections and CorreClive aClions during plant outages. Inspections 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 l

performed 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 required a shorter inspection interval will override the previous schedule.

A snubber is-considered inoperable if it fails the acceptance criteria of the visual inspection.

I l

LIMERICK - UNIT 1 B 3/4 7-2

PLANT SYSTEMS 3/4.7.4 SNUBBERS LIMITING CONDITION E0R OPERA 110N

=

3.7.4 All snubbers shall be OPERABLE.

APPLICABIL11Y: OPERA 110NAL CONDITIONS 1, 2, and 3. OPERATIONAL CONDITIONS 4 and 5 for snubbers located on systems required OPERABLE in those OPERATIONAL CONDITIONS.

ACTION:

With one or more snubbers inoperable on any system, 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 OPERABLr status and perform an engineering evaluation per Specification 4.7.49 on the attached component or declare the attached system inoperable and follow the appropriate AC110N statement for that system.

SURVEILLANCE REQUIREMENTS 4.7.4 Each snubber shall be demonstrated OPERABLE by performance of the following augmented inservice inspection program and the requirements of Specification 4.0.5.

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 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 Tabic 4.7.4-1. The visual inspection interval for each type of snubber shall be determined based upon the criteria provided in Table 4.7.4-1 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 (NRC will include the number of the license amendment that implements this change).

LIMERICK - UNIT 2 3/4 7-11

~

l 1

TABLE 4.7.4-1 SNUBBER VISUAL INTPTCTT6N INTERVAL NUMBER OF UNACCEPTABLE SNUBBERS Population _ Column A Column B Column C or Category Extend Interval Repeat interval Reduce Interval (Notes 1 and 2) (Notes 3 and 6) (Notes 4 and 6) (Notes 5 and 6) 1 0 0 1 80 0 0 2 100- 0 1 4 150 0 3 8 200 2 5 13 300 5 12 25 400 8 18 36 500 12 24 48 750 20 40 78 1000 or greater 29 56 109 Note 1: The next visual inspection interval for a snubber population or category size shall be determined based upon-the previous inspection interval and the number of unacceptable snubbers found during that interval. Snubbers may be categorized, based upon their accessibility during power operation. as accessible or inaccessible.

These catergories may be examined separately or jointly. However, the licensee must make and document that decision before any inspection and shall use that decision as the basis upon which to determine _the next inspection interval for that category.

Note 2: Interpolation between population or category sizes and the number of unacceptable snubbers is permissible. Use next lower integer for the value of the limit for Columns A, B, or C if that integer includes a fractional value of unacceptable snubbers as determined by interpolation.

Note 3: If the number of unacceptable snubbers is equal to or less than the number in Column A, the next inspection interval may be twice the previous interval but not greater than 48 months.

Note 4: If the number of unacceptable snubbers is equal to or less than the number in Column 8 but greater than the number in Column A, the next inspection interval shall be the same as the previous interval.

LIMERICK - UNIT 2 3/4 7-lla

TABLE 4.7.4-1 (continued)

SNUBBER VISUAL INSPECTION INTERVAL Hote 5: If the number of unacceptable snubbers is equal to or-greater than the number in Column C, the next inspection interval shall be two-thirds of the previous interval. However, if the number of unacceptable snubbers is less than the number in Column C.but greater than the number in Column B, the next interval shall be reduced proportionally by interpolation, that is, the previous interval shall be reduced by a factor that is one-third of the ratio of the difference between the number of unacceptable snubbers found during the previous interval and the number in Column B to the difference in the numbers in Columns B and C.

Note 6: The provisions of Specification 4.0.2 are applicable for all inspection intervals up to and including 48 months.

LIMERICK - UNIT 2 3/4 7-11b

. PLANT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued)

c. Visual Inspection Acceptance Criteria 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) fasteners for attachment of the snubber to the component and to the snubber anchorage are secure.

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, providing that: (1) the cause of the rejection is clearly established and remedied for that particular snubber and for other snubbers irrespective of type on that system that may be generically susceptible; and/or (2) the affected snubber is functionally tested in the as found condition and determined OPERABLE per Specifications 4.7.4f. For those snubbers common to more than one system, the OPERABILITY of such snubbers shall be considered in assessing the surveillance schedule for each of the related systems. A review and evaluation shall be performed and oocumented to justify continued operation with an unacceptable snubber. If continued operation cannot be justified, the snubber shall be declared inoperable and the ACTIONS requirements shall be met.

d. Transient Event inspection 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 or a visual inspection of the systems, within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> for accessible systems and 6 months for inaccessible systems following this determination. In addition to satisfying the visual inspection acceptance criteria, freedom-of-motion of mechanical snubbers shall be verified using at least one of the following: (1) manually induced snubber movemert; or (2) evaluation of in-place snubber piston setting; or (3) stroking the mechanical snubber through its full range of travel.

LIHERICK - UNIT 2 3/4 7-12

- - - - .- - =_. - - - . - - -

PLANT SYSTEMS BASES 3/4.7.4 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.

Snubbers are classified and grouped by design and manufacturer but not by size. For example, mechanical snubbers utilizing the same design features of the 2-kip, 10-kip, and-100-kip capacity manufactured by-Company "A" are of the same type. The same design mechanical snubbers manufactured by Company "B" for the purposes of this Technical Specification would be of a different type, as would hydraulic snubbers from either manufacturer.

A list of individual snubbers with detailed information of snubber location and size and of system affected shall be available at the plant in accordance with Section 50.71(c) of 10 CFR Part 50. The accessibility of each snubber shall be determined and approved by the Plant Operations Review Committee. The determination shall be based upon the existing radiation levels and the expected time to perform a visual inspection in each snubber location as well as other factors associated with accessibility during plant operations (e.g., temperature, atmosphere, location, etc.), and the recommendations of Regulatory Guides 8.8 and 8.10. The addition or deletion of any snubber shall be made in accordance with Section 50.59 of 10 CFR Part 50.

The visual inspection schedule is based on the number of unacceptable snubt' found during the previous inspection in proportion to the sizes of the various

. snubber populations or categories. The visual inspection interval is based on <

fuel cycle of up to 24 months and may be as long as two fuel cycles or 48 months depending on the number of unacceptable snubbers found during the previous visual inspection. The visual inspection schedule provides confidence that a constant level of snubber protection is being maintained and generally allows performance of visual inspections and corrective actions during plant outages. Inspections 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. Any inspection whose results required a shorter inspection interval will override the previous schedule.

A snubber is considered inoperable if it fails the acceptance criteria of the visual inspection.

LIMERICK - UNIT 2 B 3/4 7-2