ML17266A210

LER 80-027/09T-0:on 800514,during Shutdown for Maint,Nsss Notified Util That Partial Draining of RCS While in Mode 5 Is Condition That Has Not Been Analyzed for Boron Dilution Event.Procedures Revised to Increase Min Shutdown Margin

ML17266A210
Person / Time
Site:	Saint Lucie
Issue date:	05/21/1980
From:	Schoppman M FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17208A673	List: ML17208A672 ML17266A210
References
REF-PT21-80-220-001 LER-80-027-09T, LER-80-27-9T, NUDOCS 8006030449
Download: ML17266A210 (2)

Text

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=VEi4T'DESCRIPTION 9 NO PROS*EL.E CONSEQUENCES QIO 0 '"- ) Durin shutdown for maintenance the NSSS notified FP th t oartial drain-in of the RCS while in Node 5 is a condition that has not been anal zed for the boron dilution event. Reduced'RCS"volume would result in

~35 a redi cted t ilme to cri tical i t 1 ess than the assumed time eri od for o er ator action assumin the T.S. minimum shutdown mar in of lA ho existed at the onset of the event . This is reportable under T.S. 6.9.1.8 because a partiall drained RCS is less conservative than anal zed in the. FSAR .

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LOO~O 21 4l 40 LYJQ 41 ZNJQ i 42 ZIQ JA 31 CAUSE DESCRIPTION ANO CORRECTIVE ACTIQNS Q27 0 In accordance with NSSS recommendation r crease the minimum shutdown mar in from lA ho to 2X h ensures 20 min.

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Reportable Occurrence 335-80-27 Licensee Event Report Pa e Two Additional Information

l. The applicability of this occurrence to. St. Luci.e Unit 2 and Turkey Point Units 3 8 4 is under consideration.

2. A Technical Specification change is being prepared to address operation in Mode 5 with a partially drained RCS

3. Entry into Mode 5 is from Nodes requiring higher shutdown margins.

Deliberate dilution would be re'quired ta a'chieve the minimum shutdown margin specified in Technical Specifications for Node 5.

The higher shutdown margins in Mode 4 and 6 and the need for deliberate dilution to achieve the minimum Node 5 shutdown margin makes this event unlikely.