ML20214S295

Proposed Tech Specs Re Operability of Hydraulic Snubbers on Loss of Fluid

ML20214S295
Person / Time
Site:	Hatch
Issue date:	11/20/1986
From:	GEORGIA POWER CO.
To:
Shared Package
ML20214S247	List: ML20214S243 ML20214S295
References
TAC-64157, TAC-64158, NUDOCS 8612080243
Download: ML20214S295 (2)

Text

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3/4 6.L. SNUBBERS  ;

SURVEILLANCE REQUIREMENTS (Continued) systems associated with the safety-related mechanical snubbers shall be inspected to determine if there has been a severe dynamic event. ,

(b) In the event of a severe dynamic event, snubbers in that system which experienced the event shall be inspected during the refueling outage to assure the snubbers have freedom of movement and are not frozen up. The inspection shall consist of verifying freedom of motion using one of the following: (i) Manually induced snubber movement; (ii) stroking the mechanical snubber through its full range of travel. If one or more mechanical snubbers are found to be frozen up during this inspection, those snubbers shall be replaced (or overhauled) before returning to power. Re-inspection shall subsequently be performed according to the schedule of 4.6.L.l., but the scope of the examination shall be limited to the systems associated with the safety-related mechanical snubbers. 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 per Specification 4.6.L.4. or 4.6.L.S., as applicable. However, if a hydraulic snubber is found to contain less than the required minimum volume of reserve fluid, the snubber shall be l determined inoperable and cannot be determined OPERABLE via functional testing for the purpose of establishing the next visual inspection interval.

3. Functional Tests 9

At least once per 18 months during shutdown, a representative sample of 10% of the total of each type (hydraulic or mechanical) safety-related snubber 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 functional test acceptance criteria of Specification 4.6.L.4. or 4.6.L.S., an additional sample of at least 1/2 the size of the initial lot of that type of snubber shall be functionally tested.

Functional testing shall continue until no additional inoperable snubbers of a particular type are found within a sample or until all safety-related snubbers of that type have been 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. The representative sample shall be selected randomly from the total population of safety-related snubbers. At least 25% of the snubbers in the HATCH - UNIT 1 3.6-10b Proposed Snubber TS/0071q

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PLANT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued)

b. 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) for mechanical snubbers where snubber movement can be manually induced, the snubbers shall be inspected as follows: (a) At each refueling, systems associated with the safety-related mechanical snubbers shall be inspected to determine if there has been a severe dynamic event. (b) In the event of a severe dynamic event, snubbers in that system which experienced the event shall be inspected during the refueling outage to assure the snubbers have freedom of movemant and are not frozen up.

The inspection shall consist of verifying freedom of motion using one of the following: (1) Manually induced snubber movement; (ii) stroking the mechanical snubber through its full range of travel. If one or more mechanical snubbers are found to be frozen up during this inspection, those snubbers shall be replaced (or overhauled) before returning to power.

Re-inspection shall subsequently be performed according to the schedule of 4.7.4.a. but the scope of the examination shall be limited to the systems associated with the safety-related mechanical snubbers. 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 per Specification 4.7.4.d or 4.7.4.e as applicable. However, if a hydraulic snubber is found to contain less than the required minimum volume of reserve fluid, the snubber shall be determined inoperable and l cannot be determined OPERABLE via functional testing for the purpose of establishing the next visual inspection interval.

c. Functional Tests At least once per 18 months during shutdown, a representative sample of 10% of the total of each type (hydraulic or mechanical) safety-related snubber 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 functional test acceptance criteria of Specification 4.7.4.d or 4.7.4.e, an additional sample of at least 1/2 the size of the initial lot of that type of snubber shall be functionally tested.

HATCH - UNIT 2 3/4 7-12 Proposed Snubber TS/0072q 1