ML20106D124

Proposed Tech Specs Revising safety-related Shock Suppressors

ML20106D124
Person / Time
Site:	Vermont Yankee
Issue date:	10/22/1984
From:	VERMONT YANKEE NUCLEAR POWER CORP.
To:
Shared Package
ML20106D108	List: FVY-84-124, Application for Amend to License DPR-28,changing Tech Specs Re safety-related Shock Suppressors ML20106D124
References
NUDOCS 8410250006
Download: ML20106D124 (7)

Text

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VYNPS 3.6 LIMITING CONDITIONS FOR OPERATION 4.6 SURVEILLANCE REQUIREMENTS I. ' Shock Suppressors (Snubbers) I. Shock .eu ppressors (SnubbefM i 1. Except as noted in 3.6 I.2 and 3.6.I.3 below, 1. Each snubber shall be demonstrated operable j all required safety-related enubbers shall be by performance of the following inspection operable whenever its supported system is program.

required to be operable.

a. Visual Inspections

2. With one or more required 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 Visual inspections. shall be perfonned in -

restore the snubber to operable status and accordance with the following schedule:

perform an engineering evaluation per l Specification 4.6.I.1b and c, on the No. Inoperable

supported component. In all cases, the Snubbers per .

Next-Required required snubbers shall be made operable or Inspection Period Inspection Intervals replaced prior to reactor startup.

j 0- 18 months 125%-

l 3. If the requirements of 3.6.I.1 and 3.6.I.2 1 12 months 125%

j cannot be met, the supported system shall be .2 6 months 125% ,

declared inoperable and the appropriate '3, 4- 124 days 125%

action statement for that system shall be 5,6,7 62 days 125%

followed. 8 or more 31 days. 125%

The snubbers may.be categorized into two j

groups: the accessible and those

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inaccessible during reactor operation, i Rach group may.be inspected

independently in accordance with'the

above schedule. The inspection interval shall cot- be lengthened more than one j step at a time. Inaccessible snubbers l

are required to be inspected only if the

period of time in which they become j- accessible is greater than 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />.

! Amendment No. 24 -110s I 8410250006 841022 i PDR ADOCK 05000271

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k 3.6 LIMITING CONDITIONS FOR OPERATION 4.6 SURVEILLANCE REQUIREMENTS

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b. Visual Inspection Acceptance Criteria:

Visual inspections shall verify (1) that _,I

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i there are no visible indications of j damese or impaired operability,'and (2)

I that the snubber installation exhibits >

no visual indications of detachment from, foundations or supporting structures; 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 causel ._

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 per Specification 4.6.I.c, as applicable. When the fluid port of a' '

hydraulic snubber is found to be uncovered, the snubber shall be

! determined inoperable unless it can be determined operable via functional testing for the purpose of establishing i the next visual inspection interval.

.l The functional test, in this case, shall be started with the piston in the as-found condition, extending the piston rod in the tension mode direction.

110b Amendment No. 24, 39,64 .

VYNPS

• 3.6 LIMITING CONDITIONS FOR OPERATION 4.6 SURVEILLANCE REQUIREMENTS

c. Functional Tests.

At least once per 18 months during shutdown, a representative sample of 10%

of the snubbers in use in the plant shall be functionally tested either.in'

place or in a bench test. For each snubber that does not meet the.

j functional test acceptance criteria of-Specification 4.6.I~1.d,

. an additional l '

10% of the snubbers.shall be functionally tested until no more failures are found or until all snubbers have been functionally tested.

Snubbers of a rated capacity greater 4 than the capability of the testing j machine shall be functionally tested as follows: (1) the-lock up and bleed velocity of the snubber valve shall be verified by testing it on a cylinder 2

that is within the capability F the testing machine, (2) the free stroke of the cylinder shall be checked, and (3) the pressure retaining capability of the cylinder shall be checked.

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3.6 LIMITING CONDITIONS FOR OPERATION 4.6 SURVEILLANCE REQUIREMENTS i

4 Snubbers identified as especially difficult to remove or in high radiation areas shall also be included in the representative sample, 4 In addition to the regular sample,

snubbers which failed the previous functional test shall be retested.during the next test period unless the root-cause for the problem has been determined and corrective actions

implemented. If a space snubber has

, been installed in place of a failed

! snabber, then both the failed snubber (if it.is repaired sad installed in j another position) and the spare snubber

shall be retested.during the next test l period. Failure of these snubbers shall

] not entail functional testing of' j additional snubbere.

If any snubber selected for functional testing.either fails to lock up or fails-

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to move, i.e., frozen in place, the j cause will be evaluated and if caused by 3

manufacturer or design deficiency, all 1 .

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i 3.6 LIMITING CONDITIONS FOR OPERATION 4.6 SURVEILLANCg REQUIREMENTS generically susceptible 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, i'

For the snubber (s)..found inoperable, s.

documented engineering evaluation chall-

) be performed on the component (s) dich^

are suppceted by the snubber (s). The scope of the evaluation shall be based on engineering judgement and may be limited to a visual inspection of the supported component (s). The purpose of l! this engineering' evaluation shall be to-determine if the component (s) supported by the snubber (s) were adversely affected by the inoperability of the

, snubber (s) in order to ensure that the ,

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supported component remains capable of meeting the designed service.

i' d. Hydraulic Snubbers Functional Test

- Acceptance Criteria

. The hydraulic snubber functional test shall verify that:

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3.6 . LIMITING CONDITIONS FOR OPERATION 4.6 SURVEILLANCE REQUIREMENTS

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1. Activation (restraining action)'is

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

i g 2. . Snubber bleed, or release rate, whe re re qui red , i s ' wi t hi n t he 4

specified. range in compression or tension. For snubbers specifically required to not' displace under.

continuous load, the-ability of the 6

snobber to withstand load'without-displacement shall be verified.

J. Thermal liydraulic Stability J. Thermal Ilydraulic Stability -

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1. When the reactor mode switch is in RUN, the Operation in the natural circulation mode shall be timed and recorded .for special tests. Also, i reactor shall not intentionally be operated j in a natural circulation mode, except as during special tests loop temperatures, vessel-j pennitted in 3.6.J.2 below, nor shall an idle saturation temperature (pressure), . vessel top head recirc ulation pump he started with the temperature, and vessel bottom head temperature t

reactor in a natural circulation mode, except shall be monitored and recorded. .

as permitted in 3.6.J.2.

! 2. For the purpose of performing special tests,

, operation in the natural circulation mode is pe rmi t ted . For the purpose of recovering

, forced circulation operation during and af ter special tests at natural circulation, startup of an idle recinculation pump is permitted if:

, a. The AT between the idle loop and vessel saturation temperature is 1500F.

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b. The AT between 'the idle locp and an operating loop is 1500F. 110f

c. The AT between the vessel top head and '

thevesselbottomheadisj,1450F. ,g

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