05000250/LER-1982-007

LER 82-007/03L-0:on 820529,while Performing Containment Leak Insp,Broken Hangers & Broken Snubber Discovered on 3C Steam Generator Blowdown Lines.Caused by Hydraulic Shock to Blowdown Lines

ML20054K667
Person / Time
Site:	Turkey Point
Issue date:	06/28/1982
From:	Pace P FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20054K665	List: 05000250/LER-1982-007, Forwards LER 82-007/03L-0
References
LER-82-007-03L-01, LER-82-7-3L-1, NUDOCS 8207060038
Download: ML20054K667 (2)

LER-2082-007,

Event date:
Report date:
2502082007R00 - NRC Website

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go ini l While performing a leak inspection inside Unit 3 Containment, several I

. firiT) I broken hangers and a broken snubber (#37) vere discovered on 3C steam I iTTTll generene blowdown lines. Closer impaction fo1ma evidence of approximate-I lo isi i ly 12 inches of line movement. This is reportable in accordance with I

! is i i T.S. 3.13.1. A new snubber was installed within 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> of the discovery 4 I

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iiic,i1 The cause was determined to be hydraulic shock of the blowdown lines when 1 y I the. blevdown isolation valve is onened. "'his new blevdown syste- was t

,,,,,i installed during the recent steam generator repair outage. Special instruc-iii: tI tions for blowdown system operation have been issued. Bv followine the 1 iii.i ! sequence for valve lineup and operation, the hydraulic shocking is avoided. !

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REPORTABLE OCCURRENCE 250-82-007 Licensee Event Report Page two Additional Cause Description and Corrective Actions This blowdown system has only been in use for approximately two mcnths. It was installed when Unit 3 was shutdown for repair of the steam generators.

. The hydraulic shocking of the blowdown lines was noticed when the systen first went into operation. After analyzing the problem, it was concluded that tne hydraulic shock could be prevented by following a certain sequence of valve operations whenever the blowdown system was used. A set of special -

instructions was composed and then tested with various personnel observing the blowdown lines for movement. The results were satisfactory. In the future, the blowdown system will always be operated according to the special instructions.

Future modifications are being considered to enhance the blowdown system operation.

The broken snubber (No. 37) was a new snubber that was installed and inspected on Unit 3 according to MP-0707.2 during the steam generator repair outage. -

This snubber is not currently in our Technical Specification Table 3.13-1, but the proposed Technical Specification amendment to add this snubber has been submitted to the Commission. A new snubber was installed and inspected witnin 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br />.

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