ML19329C481
| ML19329C481 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 06/23/1975 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | Knop R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 8002140859 | |
| Download: ML19329C481 (1) | |
Text
{{#Wiki_filter:- t TJNAs .n. I JUN 2 3 1975 U d u J{J T $ N] bbb yDP O' - bdU liote to R. C. Xnop, IE:III POST ACCIDE'tT ADEQUACY OF OUT Of CORE fiEUTR0!4 CETECTORS AT DAVIS 6 ESSE, OiilT I - LOCKET h0. 50-34o (ACTIO t cultTRet ITE;i F300/2hll In response to your request for technical assistance to determine the adequacy of the above nuclear instrumntation following a loss of coolant accident (LOCA), w have reviewed tne matter and submit our findings in the following summary for your infomation. At present, standard cabling and installation has ot racched the point wnere cora detectors anu asscciated sisaal cable can operate satisfactorily and centinocus12 uncer tne raxiwu envircracntal conaiticns expected following a ucrst case (i.e., large LCCA) accident, nor is there a re<,uirerent fcr such operation.
- teitner Rcgulatcry Guide 1.97 nor the applicable IEEE stant.ard covering post accident. coni:cring requires toe availaatiity of out of core neutroa flux monitoring infor aticre follcwirr; a large LCCA.
Catcock T2 Wilcox, :he flSSS supplier to Gavis Besse Plant stated taat no credit was taken for tne availability of the cut of core neutron waitoring s.ystaa in their safety analysis of a lar'ia LOCA. On enis basis, S W coes not deem it necessary to grevi n neutron fh t information frca tais systcm uncer worst case conditions. The design (test) values of pressure and relat ncticity given fcr the out of cera detectors and listed in Taole 7-4 (Volame 3, page 7-e7) of tne FSAR do no: agree with relattd-values listad in Table 6-3 (page 5-7) of 60,1 Topical sc; ort tio. IC0d3 aad entitled " Qualification Testing of Protection Systc:a lastramntacien." uased on :ne ai>ove findings and variations, we are forwarding a copy of tais asorandum and a copy of too memorandi.n fr:n Martin to cop dated cgril 17, 1975 to the lRC *L" Davis Ecsse Project Manager, Hessr. Leon Engle, for infonnation and possible action. Other than tne alove, we plan no futther action on these matters. Should you have any questions concerning the above statsxnts, please contact ce or Vince Thomas on Extension 7421. Original afeed by K.V. Seyfrit l K. V. Seyfrit u..
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