ML17206A478

LER#78-037/01T-0 on 780919:during Inspec 66 Class I Longitudinal Braces on RAB Ventilation Ducts Were Found to Be Missing.Cause Unknown.Remaining Braces Will Be Installed W/In 1 Week

ML17206A478
Person / Time
Site:	Saint Lucie
Issue date:	10/02/1978
From:	Beverly Sweeney FLORIDA POWER & LIGHT CO.
To:
Shared Package
ML17206A477	List: ML17206A476 ML17206A478
References
LER-78-037-01T, LER-78-37-1T, NUDOCS 7810120057
Download: ML17206A478 (3)

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~OI 2 I Durin s stem inspections, 66 CEass I Longitudinal Braces on the RAB Ventilation Ducts were found to be missing. Radial restraints are roperly installed. The affected safety related ventilation systems are 5 onl re uired in the event of a LOCA. A preliminary engineering evaluatio by our AE indicates that existing restraints are capable of sustaining the additional loads durin a design bases seismic event.

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42 44 41 CAUS" OcSCRIP ION ANO CORRSCTIVc ACTIONS Q27 Q The cause for the missing braces is not fu 1 ly known at this time. A i

further re ort will be forwarded when the exact cause is known. Install-ation of the missin braces is resentl in ro ress on an expedited basis with about 90% of the braces installed. The remaining braces will be

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installed within one week.

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REPORTABLE OCCURRENCE 335-78-37 LICENSEE EVENT REPORT PAGE 1%0 Additional Event Descri tion The system inspections were being conducted to verify plant "as built" design drawings. The affected safety related systems, Control Room Ventilation, Emergency Core Cooling Systems Area Ventilation (including portions of the Reactor Auxiliary Building Ventilation supply system), and Shield Building Ventilation are only required in the event of a LOCA. In order for them to possibly fail to fulfilltheir functions an earthquake would also have to occur. The probability of these two events occuring in the near future is extremely low. A preliminary engineering evaluation performed by the AE has determined that the existing ventilation duct retraint system on the safety related system in question is capable of sustaining the additional loads imposed upon it due to the absence of the 66 missing longit-udinal braces during a design bases seismic event. Other ventilation systems in containment and shield building do not require the .longitudinal braces so are not ',a concern.

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Cause Descri tion

'dditonal il It appears that there was a communication error between the AE and a subcontractor concerning responsibility for install-ing the braces. A follow-up report will be forwarded when the exact cause is known.

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