ML20107L061

Proposed Tech Spec Page 125 Re safety-related Shock Suppressors

ML20107L061
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	11/06/1984
From:	VERMONT YANKEE NUCLEAR POWER CORP.
To:
Shared Package
ML20107L047	List: FVY-84-133, Forwards Revised Tech Spec Page 125 Inadvertently Omitted from 841022 Request for Amend to License DPR-28 Re safety-related Shock Suppressors ML20107L061
References
NUDOCS 8411130396
Download: ML20107L061 (1)

Text

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3.6.I and 4.6.I SHOCK SUPPRESSORS (SEUBBERS) l f All snubbees.are required operable to ensure that the structural integrity of the Reactor Ccclant System and all other.

i .cafety-related systems is maintained during and following a seismic or other event initiating dynamic loads.

!, The visual, inspection frequency is based upon maintaining a constant level.of snubber protection to systems.

I Therefore the required inspection interval varies inversely with the observed snubber. failures.and is determined by.  !

f- f -the number'of inoperable snubbers found during an inspection. Inspections performed before that' interval has elapsed.

i j may be used as a new reference point to' determine the next inspection. However, the results of such early inspections F 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 require a shorter inspection interval will override the previous schedule.. j i ~

' When the cause of the rejection of,a snubber is. clearly established and remedied for that snubber and for any other i snubbers that may be generically susceptible, and verified by functional testing, that snubber may be exempted from.

! being counted as inoperable. Generically susceptible snubbers are those which are (1) of a specific make or model,

' (2) of the same design, and (3) similarly located or exposed to the same environmental conditions such as temperature,

! radiation, and vibration. These characteristics of the snubber installation shall be evaluated to determine if

! further functional testing of similar snubber installations is warranted.

l When a snubber is found inoperable, an engineering evaluation is performed, in addition to the determination of the j anubber mode of failure, in order to determine.if-any safety-related component or system has been adversely affected j by the inoperability of the snubber. -The engineering evaluation shall determine whether or not the snubber mode of l

failure has imparted a significant effect or degradation on the supported component or system. ,

l To provide assurance of snubber functional reliability, a representative sample of the installed snubbers will be

functionally tested once each operating cycle. Observed failures of these sample snubbers shall require functional j testing of additional units.

l 3.6.J THERMAL HYDRAULIC STABILITY j l

tot allowing operation in a natural circulation mode will provide additional stability margin, and it will provide l

protection against a reactivity insertion transient due to starting of an idle recirculation pump from the natural

circulation mode.

i i Amendment No. 2A, 39 125

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