ML20246K172
| ML20246K172 | |
| Person / Time | |
|---|---|
| Issue date: | 06/13/1989 |
| From: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Novak T NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD) |
| Shared Package | |
| ML19306D150 | List: |
| References | |
| NUDOCS 8907180083 | |
| Download: ML20246K172 (2) | |
Text
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JWi 131968 i
i" Thomas Novak., Director.
g MEWAANDUM FOR: Division for Analysis and Evaluation of Operational Data
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J. Nelson Grece Regional Administrator FROM:
s REGION !! COMMENTS ON PRELIMINARY C WATER SYSTEM FAILURES AFD DEGRADAT10 o
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'I ability of sfrvice wattr i
l Region !! has been sensitive to tbtf issue of the vu ner On February 2, 1988.
systems to different types of degradation for some tim hangers to statermine w
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l' operability to NRR for action.
h findings of ine service water inspections performeo in Region !! support t e s
i Review of the case study did not reveal My problems relat Some observations, based upon our the case study.
f the case study.
to the technical accuracy of.the report. inspection experienc E
r i l to problems Our inspectors found that the licensees have respoMed aggress v f
l are disecvered.
that have been identified at their sites.
monitor degradation are put in place shortly after prob ets W.
bl s not currently The licensees are not as' aggressive in searching for pro anRespons f
w.P l problems.
identification of identified at their sites.
programs for Nture monitoring of the potentiator period h
n The recommenostion m:
inopertble.
d apply problems prior to the head exchangers becomingi roposed by our draft bulletin, but the bulletin woul R, P.
i, to all safety relate Q,
water or not. '
d of your FRA W
Our regional review was able te supoort the ord lants with the m-SARA includes, in it:
I System Analysis and Risk Assessment (SARA) PC software. failure The NUFIG 1150 plants.
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database, the dominant sequences from the PRAs i
s were; water pumps to one or failing all service pump New
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Original ig7rg, felt Frequency Core Melt Freoutncy u
M plant 2.476 E-2
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1.54?E 4 3.288 E-3 Iton 3.011 E-S 2.288 E-3 I
Grand Gulf 2.457 E-5 2.166 E-3 Surry 8.579 E-5 1.705 E-4 5equoyah 8.394 E-6
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g 89071Mm3 e90707 PDR REVGF NRCCRGR MEETING 162 PDC
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lt frequency Making the service water sy} stems inopereb3a increased the core m by a factor of 100 at the p s,nts.
directed to Rudy Bernhard at 4
Questions conceming our comments can tt
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J.. Nelson Grace Regicnal AcmGistrator
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