ML17207A733

Tech Specs Pages 3/4 7-33 Through 3/4 7-37,deleting 27 Entries from Table 3.7-2 Re Replacement of safety-related Hydraulic Snubbers

ML17207A733
Person / Time
Site:	Saint Lucie
Issue date:	01/09/1980
From:	FLORIDA POWER & LIGHT CO.
To:
Shared Package
ML17207A732	List: ML17207A731 ML17207A733
References
NUDOCS 8001140450
Download: ML17207A733 (14)

Text

I TABLE 3.7-2 Continued SAFETY RELATED HYDRAULIC SNUBBERS*

FPL LOCATION HARK SYSTEM SNUBBER INSTALLED ACCESSIBLE OR HIGH RADIATION ESPECIALLY DIFFICULT NO. NO. ON LOCATION AND ELEVATION INACCESSIBLE ZONE** TO REMOVE A or I Yes or No Yes or No 033 HS 649-319 HS, Reactor Bldg., El ev., No No 82'lev.

034 HS 548-5 HS, Reactor Bldg., A No No I

82'lev.

036 HS 649-314 MS, Reactor Bldg., No No 55'lev.

037 HS 649-314 HS, Reactor Bldg., I No 55'lev.

038 HS 649-310 MS, Reactor Bldg., I No No 50'lev.

039 HS 649-304A HS, Reactor Bldg., A No Yes 30'lev.

040 HS 548-9 HS, Reactor Bldg., I No Yes 50'lev.

041 NS 548-9 HS, Reactor Bldg., I No Yes 50'lev.

042 BF 549-7 BF, Reactor Bldg., I No 40'lev.

043 BF 549-7 BF, Reactor Bldg., I No No 40'lev.

044 BF 549-8 BF, Reactor Bldg., I Yes 36' 40'lev.

047 BF 549-17 BF, Reactor Bldg., A Yes CO C7

TABLE 3. 7-2 Continued SAFETY RELATED HYDRAULIC SNUBBERS*

FPL LOCATION HARK SYSTEM SNUBBER INSTALLED ACCESSIBLE OR HIGH RADIATION ESPECIALLY DIFFICULT NO. NO. ON LOCATION AND ELEYATION INACCESSIBLE ZONE** TO REMOVE A or I Yes or No Yes or No 052 BF 549-17 BF, Reactor Bldg., Elev. 36'53 No No SI 968-210 SI, Reactor Bldg., Elev. 16'58 No SI 969-1216 SI, Reactor Bldg., Elev. 18' A No No

'ql TABLE 3.7-2 Continued SAFETY RELATED HYDRAULIC SNUBBERS*

FPL LOCATION MARK SYSTEM SNUBBER INSTALLED ACCESSIBLE OR HIGH RADIATION ESPECIALLY DIFFICULT NO. NO. ON LOCATION AND ELEVATION INACCESSIBLE ZONE** TO REMOVE (A or I) (Yes or No (Yes or No 081 SI 676-67 SI, RAB, Elev. No No 4'82 SI 676-67 SI, RAB, Elev. A No No Elev. 4' 4'83 SI 676-105 SI, RAB, A No No

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TABLE 3.7-2 Continued SAFETY RELATED HYDRAULIC SNUBBERS*

FPL LOCATION MARK SYSTEM SNUBBER INSTALLED ACCESSIBLE OR HIGH RADIATION ESPECIALLY DIFFICULT NO. NO. ON LOCATION AND fLEYATION INACCESSIBLE ZONE** TO REMOYE A or I Yes or No Yes or No 084 SI 676-105 SI, RAB, Elev. No Elev. 7' 4'12 SI 676-4505 SI, RAB, A No tD CO C)

TABLE 3.7-2 Continued SAFETY RELATED HYDRAULIC SNUBBERS*

FPL LOCATION HARK SYSTEM SNUBBER INSTALLED ACCESSIBLE OR -

HIGH RADIATION ESPECIALLY DIFFICULT NO. NO. ON, LOCATION AND ELEVATION INACCESSIBLE ZONE**. TO REMOYE A or I Yes or No Yes or No 102 HS-649-313 CC, RAB, Elev. 26' No

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SAFETY 'EVALUATION Re: St. Lucie Unit 1 Docket No. 50-335 Snubbers I. Introduction This evaluation supports a proposed change to Table 3.7-2 (SAFETY RELATED HYDRAULIC SNUBBERS). Several snubbers on the list are deleted because they are scheduled to be replaced by mechanical snubbers during the next refueling outage (Spring 1980). Only smaller snubbers of the 3 kip (3000 inch-pounds) and 10 ki p size will be affected by the changeover (see attached list)-

II. Evaluation The snubbers in question are designed and installed for seismic considerations. That is, their design function is to accommodate pipe movement caused by slow thermal expansion, but to "lock-up" to prevent potentially damaging transient movement duri ng a postulated seismic event of sufficie'nt magnitude. The Pacific Scientific (PSA) mechanical snubbers which we propose to use operate on an "acceleration limiting" basis. PSA snubbers permit thermal movement since the acceleration .

associated with thermal movement is very low, but they limit seismic induced acceleration to 0.02g.. Mechanical snubbers would actually allow less movement than hydraulic snubbers under seismic conditions because

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of hydraulic snubber lockup delays associated with achieving- the lockup velocity, activation of the lockup mechanism, and compression of the hydraulic fluid. Therefore, based on seismic functional requirements, the planned replacement of hydraulic snubbers with mechanical snubbers would be an improvement.

Pacific Scientific performed extensive testing in developing the PSA 3 (3 kip) and PSA 10 mechanical sriubbers. The purpose was to evaluate their operability under the adverse conditions expected in many applications, such as high humidity, high temperature, and vibration.

The snubbers operated favorably under all test conditions.

PSA 3 and PSA 10 mechanical snubbers are currently in use at St. Lucie (see Amendment 31 to Facility Operating License DPR-67) and at a large number of other reactor sites. The use of these snubbers has been previously evaluated by the Commission and found to be acceptable.

III. Conclusions Based on testing and operating experience, the use of PSA mechanical snubbers should improve the operability of the seismic support system.

In conclusion, (1) the proposed change does not increase the probability or consequences of accidents or malfunctions of equipment important to safety and does not reduce the margi n of safety as defined in the basis for any technical specification, therefore, the change does not involve a significant hazards consideration, (2) there is reasonable assurance that the health and safety of the public will not be endangered by

operation in the proposed manner, and (3) such activities will be conducted in compliance with the Commission's regulations and the-issuance of this amendment will not be inimical to the common defense and security or to the health and safety of the public.

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Snubber Chan eout PSL The folios(ing hydraulic snubbers are scheduled to be replaced by mechanical snubbers during the Spring 1980 refueling outage:

V 3 Kip Size 10 Kip Size Tag No. Hark No. Tag No. Hark No.

035 HS-1076-3164 101 CC-17-1 061 HS-549-11 (S I-970-1248) 103 CC-21-5 066 HS-549-11(S I-970-.1248) 104 CC-21-1 073 . SI-972-6240 105 CC-23-2 074 SI-973-240 076 SI-973-6224 077 SI-868-64 079 SI-868-163 080 SI-868-410 086 SI-676-129 087 SI-676-241(SI-676-250) 088 CC-1899-48 089 CC-1852-6241 090 SPS-27 091 SPS-417 092 SPS-467 093 SPS-777 096 CC-1865-9 106 CH-3-40 107 CH-3-75 110 SI-676-247(SI-676-2475) 111 S I-676-247 5A 114 SI>>972-6240

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