ML19319C791
| ML19319C791 | |
| Person / Time | |
|---|---|
| Site: | Indian Point, Crystal River  |
| Issue date: | 05/13/1975 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Rodgers J FLORIDA POWER CORP. |
| References | |
| NUDOCS 8003040764 | |
| Download: ML19319C791 (5) | |
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< :.. :2.tcrAur;, I'lorida 33733 c.~..mu cntly conclucting a ruvicu of the effects of nacondnry systen or~
t fluid flw instcbility in I'.'.l's.
Evcntc, cuch as the dcnnge to the
^ced.etcr ryster piping tiz.t occtred at the Indian Point 2 fccility on vo N.r 13, 1973, could crinir:cte cs a recult of the uncoverf n;, of uA nter cr.zrger :n the ctenn generctor or the unccverine of the r: c.
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Subcequent cycnto rny in tr : I c.9 t a th e ccnercticn of a pressure rc.vc that is propagtted through t:-e pinea.
'increicre, ve recucct that you provide the infor:2ction contained in the encle';rn.
Tnio inferration vill cnable us to deterr.ine rhether there cifc ers Envc been ccusidcred in the Crystal River, Unit 3 plcnt dcsign.
' '.c : c e f. fern us rithir enven (7) J ys af ter rec.npt of this letter of luic. for prw4 ling
- is infort: tion.
P1rre cartnct us if ycu r
'.c c-cuertions rerjirdinc the :. form.rica requcr.te.'.
Sincerely,
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sci'cencer, Chie f Lirht ater lec.ctors iltcrch 2-3
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St. Petersvurg, :Ieri k 33733 becs:
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Tha. follcuing-is a general list of infornation required for our review
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of the ef f ectn of secondary syntta fluid fica instr.bility in 177R' n, nnd 'for ouE review of nny proposed ' asign chen;;es that ::ay b-2 found d
necessary.
Since piping layouts and nysten designs are substcatially different frca plant to plant, you should deternine the applicchility ta the Crystal 2ivar, Iznit 3 design of each of the follcuing itens for inclusion in your response.
1.
Describe ell potential operating occurrences that could cause the level of the water /steso interface in the stca:n gtaerctor t.o drop below and unco /er the feed; cater spargcr (or inlet nazrles), and all c.. ster.c to enter the npa::ger and the feedvarer piping.
Such uncoverings could lead to " water harcer" that could rer, ult in deleterieus cbar.equ::nces or the synt ca piping (e.g., Indian
' Point 2 feed.ater line failure, Novenber 13, 1973).
2.
Dancribe end show by irenetric diagrrus, the routing of the nain nr.d nuniliary feedwater pipin;; f ron the stcan generators outuards throu;;h contni:=ent up to the outer ir.olation valve and restraint. '.: hen describin3 the piping run, note all' valves and reference ccatinually, the clevatien of The inlet no: rles and/or sparger with respect to the piping run elevation.
3.
Deseribe cll nnclyses of the piping systen in d ich dynctic forcing functicas were asstr:ad.
Al t. o, provide tha results of any test prograns that were carried out to verify that either uncovering of the icedwater lines could not. occur at your f acility, or 'if it did occur, the rater hc.nor offeet did not result.
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provide tha tech.ical basis th;.t ycn estd to ascure t.het en c.pproprJ a te choice t- ' t,nde, t.a d t h a t.> &u,: e c t e concervatican s:cro included in the analvtical r.odel.
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If a tent progrnn van folleued, prcIvide the basis for conuring th :t the program ade..
71y tracht.d and predicted the flow inntability event that occurrcd, t.nd further, that the tent results centa!ned ader;uate connervatin=3 c.nd an acceptt.ble facter of nafety, e. ;;., rt.nge of parca.ters co ecred all conceivabin t..oden of operat !.o:..
If neithec a o$ b have'Leen perfer.~d, prevent your banic for not requiria:; cith :r.and yeur f uture plans t o inva :tigate th.n poten ti al, t rant.i cal occurrence.
4.
In order to bound the co:.neqm neen of thin event, discunn the pornibilit y of a sparger or no: nie uncoverie,;, and the consequent prennere unvc effects t h.: t t.c.ald occur in the pipi r.:.; fe]louing a denign basi s accident '.ei t h cencer ren t turbir.e trip eid Joan of o f f-c. i t e p c*.:c t.
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S.
If plant syr. ten det.ign changes are to ha rade t.o preclude tha occeti ence of flow innt abilitie::, describe t1
- .e changen or codificatione and discuss the reasonr. that rade this alternntive superior to c,ther alternativen that nicht have been applied.
Diccuco the quality accurance progran that ui.11 be folleuad to assure that the plannad systen nodifications will have becn correctly accor.plish.?d at the f acilit y.
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