ML20097J170

Proposed Tech Specs Re safety-related Shock Suppressors

ML20097J170
Person / Time
Site:	Peach Bottom
Issue date:	09/14/1984
From:	PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
Shared Package
ML20097J142	List: ML20097J141 ML20097J161 ML20097J170
References
NUDOCS 8409210134
Download: ML20097J170 (7)

Text

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-LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS

3.ll.D. Shock Suppressors.

4.11.D. - Shock Suppressors

'(Snubbers) on - Safety Related' (Snubbers) on Safety Related Systems Systems 3.ll.D.1 _During all modes 4.ll.D.1 of. operation all snubbers'on safety-related Snubbers required to be systems shall.be operable operable under the provisions except as noted in of 3.ll.D.1 shall be demonstrated 3.11.D.2 and.3.11.D.3 OPERABLE by performance of the s

below.

Snubbers on following augmented inservice

'non-safety related inspection program and the systems are excludedLfrom requirements of Specifi-

'this requirement if their cation 4.6.G.

failure or failure of the system on which. installed has.no adverse effect on a safety-related system.

3.ll.D'.2 During operation in the 4.ll.D.2 cold shutdown or refueling modes, snubbers located on.

Snubbers required to be systems required to be operable operable under the shall be operable except provisions of 3.ll.D.1 Ras noted in 3.ll.D.3..

shall be visually inspected according to the following schedule.

i No. of Snubbers Next Visual Found-Inoperable Inspection During Inspec-Period e

-3.11.D.3 With one or more tion Period snubbers inoperable under the requirements of 0

18 mo. + 25%

3.ll.D.1, within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, 1

12 mo. T 25%

-replace or restore the 2

6 mo. f 25%

inoperable snubber to the 3,4 4 mo. 1 25%

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operable status and perform 5,6,7 2 mo. 1 25%

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'an engineering evaluation per 8 or more 1 mo. 1 25%

l specification 4.11.D.6.

If these requirements cannot be met, declare the supported The required inspection

-c system inoperable and follow interval shall not~be the applicable Limiting lengthened more than one step

Condition for Operation for at a time.

The provisions for that System.

extending surveillance frequency included in Section 1.0 Defini-l-

tions do not apply.

Snubbers l'

may be categorized in two groups,

" accessible or " inaccessible",

8409210134 840914

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based on their accessibility for PDR ALOCK 05000277 inspection during reactor i

P PDR operation. These two groups may be inspected independently according to the above schedule.

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PBAPS LIMITING-CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 4.ll.D.3 Visual inspection of snubbers required to be operable under the provisions of 3.11.D.1 shall verify that 1) there are no indications of damage or impaired operability, 2) attach-ments are secure, and 3) there is freedom of movement if.this can be verified without disconnecting the snubber.

Snubbers which appear to be inoperable may be made operable for the purpose of establishing the next visual inspection interval, providing that 1) the cause of the rejection is f-clearly established and i~

remedied for that particular snubber and for other generically susceptable snubbers; and 2) the affected snubber is functionally tested in the as found condition and determined operable per Specification 4.ll.D.7 or 4.11.D.8, as applicable.

When the fluid port of a hydraulic snubber is found to be uncovered, the snubber shall be determined to be inoper(ble for the purpose of establishing the next visual inspection interval.

4.11.D.4 Functional Test a) Once each operating cycle, during shutdown, a representative sample of 10% of each type of (mechanical or hydraulic) snubber required to be operable under the provisions of 3.ll.D.1 shall be c

3 functionally tested either in place or in a bench test.

For every unit found to be inoperable an additional 10% of that type of snubber shall be functionally tested until no more failures are found or all snubbers of that type have been tested.

The functional test 4

requiraments for mechanical i'

->nv n -

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. LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS snubbers will not take effect-until the first refueling i

outage. commencing one year after the. issuance of Amendment No.-101/103 to the Technical Specifications.

b) The $epresentative sample selected for functional testing shall include various

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configurations, operating environments, sizes, and capacities of snubbers.

At least 25% of the sample shall include snubbers from the following categories:

1. The first snubber away.from' each reactor nozzle.

2. Snubbers within five feet of heavy equipment (valves, pumps, turbines, motors)

3. Snubbers connected to safety / relief valve discharge piping within 10 feet of the

valve, c)

If any snubber selected for-functional test either fails to lock up or fails to move, the cause shall be evaluated and if the failure is caused by manufacturing or design deficiency, all snubbers of the same design subject to the same L

defect shall be functionally tested.

This testing requirement is independent of the requirements above for-snubbers not meeting the functional test acceptance

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criteria.

p d)

Snubbers which are L

especially difficult to remove i-or are in high radiation areas during shutdown (dose greater than 100 mrem / hour) shall be included in the representative sample except for those snubbers specifically exempted l

by the NRC.

4.ll.D.5 In addition to the regular sample, snubbers required to be operable under the, provisions

_ - _ _,_ _. _ _ _._. 2234_c; _ ______,_,

uans LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS of 3.ll.D.1 which failed the l

previous functional test shall be retested during the next testing cycle.

If such a failed snubber was replaced, both the replacement snubber and the repaired snubber (if it m

had been repaired and installed in another position) shall be retested.

The test results of these snubbers may not be included for the resampling of 4.ll.D.4.a.

4.ll.D.6

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For snubbers required to be operable under the provisions of 3.ll.D.1 found inoperable, an engiheering evaluation shall be performed to determine a) mode of failure, and b) if there is any adverse effect on the supported piping or components due to the snubber inoperability.

4.ll.D.7 Hydraulic Snubbers Functional Test Criteria:

Functional test'chall verify that:

a)

Restraining action is achieved within specified range of velocity or acceleration in both compression and tension.

b)

Snubber bleed rate is within the specified range in both tension and compression.

Snubbers specifically required not to displace under continuous load shall have this

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capability verified.

4.ll.D.8 Mechanical Snubber Functional Test Criteria:

Functional tests shall t

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

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tells LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS increased more than 50%

since the last functional test.

b)

Restraining Action is 1

achieved within the specified range of velocity or acceleration in both tension and compression.

c)_ Snubber releare rate, where required, is within the specified range in compression or tension.

Snubbers specifically required not to displace under continuous load shall have this capability verified.

4.ll.D.9 Service Life Monitoring A record of the aervice life of each snubber required to be operable under the provisions of 3.ll.D.1, the date of commencement of service life, (January 1,1978, unless otherwise specified) and the installation and maintenance records upon which the service life is based shall be maintained.

Once each operating cycle, these records shall be reviewed to verify that no snubber service life shall be exceeded prior to the next review.

If the service life will'be exceeded then either recondition or replace the snubbers or re-evaluate the service life.

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PBAPS 3.11 BASES Alternate Heat Sink The alternate heat sink is provided as an alternate source of

-cooling water to the plants in the unlikely event of loss of the normal heat sink (Conowingo Pond) or the maximum credible f lood.

For the condition of loss of the normal heat sink, the contained volume of water (approximately 3.7 million gallons, which corresponds to a gauge -reading of 17')

provides a minimum of seven days cooling water to both plants for decay heat removal.

The operability requirements for the

' alternate heat sink are specified in Specification 3.9.

C.

Emergency Shutdown Control Panels The Emergency Shutdown Control Panels are provided.to assure the capability of taking the plants to the hot shutdown condition external to the control room for the unlikely condition that the control room becomes uninhabitable.

D.

Shock Suppressors (Snubbers) on Safety Related Systems Snubbers are provided to ensure that the structural integrity

- of the reactor coolant system and all other safety-related systems are maintained during and following a seismic or other event initiating dynamic loads.

Snubbers are designed to prevent unrestrained pipe motion under dynamic loads as might occur during an earthquake or severe transient while allowing normal thermal motion during startup and shutdown.

The consequence of an inoperable snubber is an increase in the probability of structural damage to piping as a result of seismic or other event initiating dynamic loads.

It is therefore required that all snubbers necessary to protect the primary coolant system or any other safety system or components be operable during reactor operation.

Because the snubber protection is required only during low probability ~ events a period of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> is allowed for repairs or replacements.

A determined effort will be made to l

rapair the snubber as soon as possible.

This allowable l

repair period is consistent with the allowable repair items l

of other safety related components such as RHR pumps, HPCI subsystems, ADS valves and diesel generators.

-An engineering analysis must be performed on supported components when a snubber is determined to be inoperable.

The purpose of this analysis is to assure that the supported components have not been damaged as a result of the snubber inoperability.

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PBAPS

' Tan percent of each type (hydraulic or mechanical) of snubber on each unit shall constitute an adequate sample.

High radiation areas (as defined in CFR 10 Part 20.202) means any area, accessible to personnel, in which there exists radiation at such levels that a major portion of the body could receive, in any one hour, a dose in excess of 100 millirem.

Snubbers considered a

especially difficult to remove are those which because of size, l

waight, or geometry of installation require the use of unusual rigging equipment or arrangements for their removal, or require more than three hours of effort in their removal.

The service life of a snubber is monitored to assure that c:nsideration is taken for the age of the expendable components.

The carvice life is based upon manufacturer's recommendation, service conditions, maintenance history, operating experience and test and inspection results.

When the review of service life records reveals

. that a snubber is nearing the end of its design service life, efforts are made to include that snubber in the next functional test cycle or the service life is reevaluated.

The purpose of the reevaluation is to extend the service life based upon experience and information gained during operations.

The results of functional testing and inspection may be used to alter the service lives of all snubbers of similar design operating under similar conditions.

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