ML17339B065

LER 80-008/01T-0:on 800505,insp Per IE Bulletin 79-14 Revealed Deficiency Re Inadequate Support of 3A & 3B Resistance Temp Detectors Bypass Loops.Unit Shut Down & Mod Implemented to Properly Support Piping

ML17339B065
Person / Time
Site:	Turkey Point
Issue date:	05/19/1980
From:	Schoppman M FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17339B064	List: ML17339B063 ML17339B065
References
IEB-79-14, LER-80-008-01T, LER-80-8-1T, NUDOCS 8005280734
Download: ML17339B065 (3)

Text

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~o 2 Notification was received that the ins27ection evaluation in ro ress in accordance with USNRC I & E Bulletin 79-14 had revealed a deficiency involving inadequate support of the 3A and 3B resistance temperature'etector (RTD) bypass loops. Reference FSAR Figure 4.2-1. This deficiency 9 I could have potentially resulted in- overstress of this piping during a SSE.

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REPORTABLE OCCURRENCE 2 80-08 LICENSEE EVENT REPORT PAGE TNO Additional Event Descri 'tion and Probable Conse uences:

E On Honday, Hay 5, 1980, notification was received from our Architect-Engineer that inspections and reanalyses in progress in accordance with USNRC IFE Bulletin 79-l~f had revealed a potential problem involving inadequate support of. the 3A and 3P resistance temperature detector (RTD) bypass loops. Reference FSAR Figure 4.2-1. Specifically, the results indicated that the calculated maximum stress associated with the piping exceeded the acceptance criteria established. for this review.

USNRC ICE Region II was notified of the above information both verbally and by facsimile transmission.

A Further review and evaluation revealed that each of the th'ree primary system RTD loops were affected by the overstress problem. This deficiency could have potentially 'resulted in overstress of this piping during a SSE. This type of deficiency should not be generic since pipe routings and support arrangements are unique.

Similar occurrences (relating to t'e inspections pursuant to USNRC ICE

.Bulletin 79-14) were reported as LER 250-79-26 and LER 250-79-40.

Additional Cause Descri tion and Corrective Actions:

The evaluation confirmed that an overstress condition could potentially exist. Based on these results, a plant change/modification was designed and installed (subsequent to unit shutdown) to correct the deficiency.

The RTD loop piping on Unit No. 4, which is now in cold shutdown, will be inspected, a stress reanalysis performed,,and modifications made, required, prior to unit return to service.

if A full accounting of inspection results and repairs will be made in response to USNRC IEE Bulletin 79-14.