ML19326C261

Proposed Tech Specs 3.13 Changes Re Hydraulic Shock Suppressors

ML19326C261
Person / Time
Site:	Arkansas Nuclear
Issue date:	02/11/1976
From:	ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19326C256	List: ML19326C254 ML19326C261
References
NUDOCS 8004220828
Download: ML19326C261 (3)

Text

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Je'gulatory Dccht He n .

3.13 Ilydraulic Shock Suppressors '

Applicability

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Ah"k Applies to all hydraulic shock suppressors listed in Table 3.13-1.

Objective

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To assure adequate shock suppression protection for prinary coolant system piping and any other safety related system or component under dynamic loads ~ as might occur during an earthquake or severe transient, while allowing normal thermal motion during startup and shutdown. This is done by assuring the operability of those hydraulic shock suppressors s installed for that purpose.

Specification 3.13.1 The reactor shall not be heated above 200F if a hydraulic shock suppressor listed in Table 3.13-1 is known to be inoperable.

3.13.2 If a hydraulic shock suppressor listed in Table 3.13-1 is determined to be inoperable during power operation, that hydraulic shock suppres-sor shall be made operable within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or the reactor shall be placed in the cold shutdown condition within an additional 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.

3.13.3 Snubbers may be added to safety related systems _without prior -

License Amendment to Table 3.13-1 provided that safety evaluations, documentation and reporting are provided in accordance with 10 CFR 50.59 and that a revision to Table 3.13-1 is included with a subsequent License Amendment request.

Bases

• 4 Shock suppressors are designed to prevent unrestrained pipe motion under dynamic loads as might occur during an earthquake or severe transier.t, ,

while allowing normal thermal motion during startup and shutdown. The consequence of an inoperable shock suppressor is an increase in the pro-bability of structural damage to piping as a result of a seismic or other event initiating dynamic loads. It is therefore required that all hydrau-lic shock suppressors required to protect the primary coolant system or any other safety systeu or component be operable during reactor operation.

Because the shock suppressor protection is required onif during relatively 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. In case a shutdown is required, the allowance of 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> to reach a cold shutdown condition will permit an orderly shutdown consis-tent with standard operating procedures. Since plant startup should not commence with knowingly defective safety related equipment, Specifi cation 3.13.1 prohibits startup with inoperable shock suppressors.

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4.16 SPECIAL SURVEI'1. LANCE Applicability Applies to miscellaneous surveillance items not covered by other specifi-c at ions'.

Objective To provide special surveillance for items not covered by other specifications.

Specification 4.16.1 tie following surveillance requirements apply to all hydraulic

,, shock suppressors liste'd in Table 3.13-1.

4.16.1.1 All hydraulic shock suppressors shall be visually inspected to verify their operability in accordance with the following mini-mum frequency schedule:

Number of Shock Suppressors Next Required Found Inoperable Inspection During Inspection Interval or During Inspection Interval 0 Each Refueling Period -

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12 months

'2 6 months 3,4 124 days 5,6,7 62 days 18 31 days i

The required inspection interval shall not be lengthened more than one step at a time. ..

Shock suppressors may be categorized in two groups, " accessible"

-or " inaccessible" based on their accessibility for inspection during reactor operation. These two groups may be inspected independently according to the above schedule.

4.16.1.2 The first inspection required cy 4.16.1.1 shall be done during the first refueling shutdown following issuance of this speci-fication. The schedule of 4.16.1.1 shall be entered at the "Each Refueling Period" interval point.

Bases ,

' All safety related hydraulic shock suppressors are visually inspected for overall integrity and operability. The inspection will include verifica-tion of proper orientation, adequate hydraulic fluid level and proper attachment of suppressor to piping and structures. I l

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~ The inspection frequency is . based upon maintaining a constant level of shock suppressor protection. Thus the required inspection interval varies inversely;with the observed. shock suppressor failures. The number of inoperable shock suppressors found during a required inspection determines the time. interval for the next required inspection. Inspections performed before that interval has elapsed (nominal time less 25%) may~ be used as a new reference point to determine ' the next . inspection. Ilowever, the results

.of such early inspections may not be used to lengthen the required inspection interval. Any inspection whose results require a shorter inspection interval will override the previous schedule. Since no hydraulic shock suppressor has previously been found to be inoperable the schedule of 4.16.1.1 will be entered at the 18 month interval point.

If the categorization option of 4.16.1.1 is used all hydraulic snock suppressors in the reactor building shall be con,sidered inaccessible and

all others shall be categorized based on radiation levels, arabient condi-tions and other occupational hazards.

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