ML20212H271

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Requests Documents Re Releases Affecting Public Health & Safety That Might Occur Should Steam Tube Fail or Any Primary to Secondary Leak of Substantial Size Occur.Related Info Encl,Including Two Excerpts from Util/B&W Trial Record
ML20212H271
Person / Time
Site: Three Mile Island Constellation icon.png
Issue date: 09/15/1986
From: Davenport D
CONCERNED MOTHERS & WOMEN ON TMI
To: Blough A
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20212H217 List:
References
NUDOCS 8701210325
Download: ML20212H271 (7)
v • d • e


Text

-

Ag- 'M dept. 19,~ 1 yc6 -

All . R. Elecch,

'e Rocctor l'rojectc, Section 1 A, Divicion of i?occtor Irojects,

'EitC !?egion 1,

~

631 J arn Avenue, i,ing of I ruccia, l enna.

Dear :

r. Blough:

Thankyou and I.r. Conte for u.ecting with iise m d : r. Erctcin to' discuco concerns I had about steau. generatorc, and their poccJ ble for large relcaces, should sten:t generator lenha occur. Ae rarerrt J 3, come of the questionc raiced by the IIdi-GFU trial data would not apply to Uniti since the engineering of the two plante is differmit in co:r.e respectc, at least ,

in reference to the condener hotte13-

. proble:c. experienced in Unit.?P..

Ti.ic .r.eanc there would-be lecc or no, hopefully , liklihood of booctor pumps being lost and thuc tripping tite feedwater cystet if I underctand the trec'tanics of the hotwell problein enough.

I still do have ctrong concerno about releases affecting public health und cafety tnat might occur uhould a sten:a abe railure,

-or any primary to secondary leek of a substantial size occur.

Arparently there are evaluations now in progroce , what proceedures to follow in th e case of a major steam tube leck. I would be ver interected in obtain tA6 any copies of those n: .'.c . might be or night become available.

Alco 1 a:n requesting that the conuunmir n -cw ba liltered 8701210325 PDR ADOCK85091589 05000 PDR

(2)

.oul' in Unit 1, ac coon as reacible via tne Fq? lirector.

filter be e. prohibitive tilat it could n the cout of cuch a be inctalleWi Ac :e dicc ucce si an of f-ceo 111ter 7:ac in th' original FE13 f or T;il, at leact for Unit 2, an.1 3 'oel thor was a reacon for it. Happily it was added af ter the acciuri t.

cur.s.ary 6 .e Unhappily, au per thic final accident tack f orce tho by GPU, under the direction of R. Leaton, among otiiero, oof-gao for Unit 2 ic listed as one of the _as($dr pathways ; or of 1:)'(j. Lo n!'.c f t o.i.

gaceouc relma s durinc the Ti:I Accident, e,

the 13 Generator are said to have containnetml the ceconder , ci:

The bect er fence c:titing through the condencer o:T-cas exhauct.

in a good de fence. . . .I would not wont to v;ait until/ I cteo tube relearn to cay, a filter would be nico.

Alco enclosed with thic letter are two excerpto froa the GFU-about IY .. Trial Record which chor one campling of the 13 generat o-and anoth^r at cove n Ali on Day One of the acc ident. . . . . . . . . . . . .

a 201,3 the ca::.c day. Th' e,econd from the r under Jzibitn or that the ca:r.ple also confirmed the I rinary to ?ocondar / J ":.

in the 13 Ge nerator , but docc not specify whethet the saii;Je

. .?

was of the generator itsell, it i<: juct called a radionuetide cer-

'l . c nr uple n t 7; N

' h,-

of 1131 at3 63 :aicrocurico per nillileter.

' wec intere M.ingly been at 0.it <)1 nicrocuries por milliliter.

incorrec t in the vtay I recounted to I;r. Conte ,that compling, and i:r. 7.under's penciled in noted on the margin of that account.

t.a.e a nt via s , could that activity have crinted in I be lie ve w het he 20h), in th" : quence.

the prinary side, of 1131, et that tir.o ,

be Finally enclosed if I can find it v;ould be na account of the

. 31st day of the accident, during vthich the plant vient Bothe to "naturvl circulation.

the li and B Generatorc cre 1.;entioned ac boing otca red to ..

the. condencer, B through Turbino Bypece valvec that viere 25;I crer , in other wordo , the B Generator viac put bach in use. Again I viould be happier if I knert that the Condencer Off-Gac had been filtered.

I do not feel it would be reason..ble to accurae that no lodine or Farticulate did r, t out b,t that route.

Jincrely,

.. c yy6 J .t H-:- ' A Debora;h Davenport ,

1002 i nrhet Street ,

C n..: . . '.iill , Fennn. I '/U 1 1 1 '71'i '765-?JD2

  • e:Fer: Concerned i'herc

{tlld ..' U8,011

[ Relief valve MU-R1 is located dciwnstream of the mak0up tcnk. Off gassing in the makeup tank probably caused a pressure buildup suf-ficient to lif t MU"R1 (set point 80 psig) which also discharges to the RC bleed holdup tanks.

The lif ting of relief valves MU-R5A & B is unlikely by either of the above mentioned mechanisms. Pressure drops across both the filters and demineralizers would prevent MU-RSA & B (located down-stream of the demineralizers) from seeing high pressures. The higher setpoint of 150 psig for MU-5A & B also supports the con-clusion that it was MU-R3 which provided the primary relief path. ,

High pressure in the makeup tank would be relieved by MU-R1, and check valves MU-V133 and MU-V107A & B (all located downstream of MU-RSA & B) would prevent backflow through the letdown line and out MU-RSA & B.

s% -

() Starting'0435 on March 29th the makeup tank was periodically vented

. to the radwaste gas system vent header by opening MU-V13. Exam-

'] .

p ination of strip chart recorders shows a strong", repetitive cor-relation between this venting and the increase in radiation levels X on several area gamma monitors in the auxiliary building and fuel

,@ handling building. It has been concluded by all investigations 9 that releases associated with venting the makeup tank represent a

' large fraction cf the total releases on March 29 and 30. There is

/ no evidence of similar venting activities on March 28th.

5. Steam Generacor Leak

]

Based on the behavior of steam generator "B", the operators suspected on March 28 that a primary to secondary leak had oc- '

curred, and this was confirmed by subsequent water samples. Steam  ;

generator "B", af ter being isolated at 0527, was reactivated at  !

0645. Strip chart recorders (HP-UR-3236-CH 7) indicate a gaseous release from the condenser vacuum pump exhaust beginning at approximately 0700.with a rapid increase in activity. The dis- I charge of the~ vacuum pumps bypasses the Auxiliary Building filters' '

and is routed ,directly-to-the-station vent. Steam generator "B"  ;

j was reisolated et 0704,_and remained isolated. The count ' rate on  ! l l

the exhaust monitor peaked at 0715, then decreased and stabilized '

I

( by about 0830.

w - _ _ .

Attempts to quantify the releases from this pathway were not i totally succeanful. Based on the_ available_information, however, the total _releares from the secondary _ system.were belileved to be i

\ substantially le.ss thac those via other_ pathways. ) .

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.te ac t o r. Cool a n t Makeup Pucp A (!!U-F-L A) was ope rat ing.

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having dif ficulty centro 111r.g the level of Steam Cenerator 3. Emerge

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Te ed 'Ja g e r 7a lve s (ET-V113 and ET-V123) were shut and the operator . . .

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.

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?: admitting f eed water to 5 team Cenerator 3 by cycling E:wegency Feed '..

. ...2 . M..O - Crosseconect Valse (ET-735).

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. . . .a .

01:13:23 Reactor Coolant Pump 23 (RC-r-23) was stopped in ace:choce ..

J..0 (0514:06) *

..--. . .:'A.j .. i.~.a Eoargency Operating Procedure 2202-1.3 to preclud. :Ae ;oestti u . .n* *'i of damage to the knactoc Coolaar Pu=p f rom operacia

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~ ~ U -j 01:13tA2- Reactor Coolanr. Pump l'8 (RC-F-18) was stopped in accordane.

.. ..y (051&s19).

'p,$ .w vith Energency Operating Procedure 2202-I.3 to preclude the

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possibil.ity of dacage to the Reactor Coolant B;mp from operat!...

... . . . . . .. ..:, ;~.. .

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.. N.**d near reactor coolanc saturation te.=peratore - pressure conditic ..

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' ' d* * ~.Q".T 51:20:31 De operator requested t.he coeputer prime the ,Eicccrenatic

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r. ;- *:7 w blief Talyw (IC-172) outler. tecpera ture. A value of 283 0T
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w.

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indicated. Emaed on this temperature the operat'or cc tisued to

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. i 2.a.p,:@e 3 b411sve- tha t the Electroesatic Ra11af Yalve (RC-R 72) .. but.

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01:26:2.3 Steen Cenerater 1 was isolated.

,9 P.ala Steam Iso 12tico Valves (0527:00)

. . . a* .@

Of5-745 and .w.$-V73) we re shut . !.ergeoey Teedvarer 7alves (ET .

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/ ET-7113 and ET-7123) were shut. De operator suspec:ed a React.

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Coolmot System to Stram Cenerator lea 2 based co the large d1*-

D - - - 41,k Y

..'.:: :~:a'~~ R, ia @(1 (C *ft)[)f orence '

la steme pressore betwen the two 5 team Cenet cora aac 3r..53

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C.h .. _y gh

. U the variations ol flhu and level experienced while c on cr olli ng

. 1y Tg.(- 5 Steam Cenera tor. A.radionuclid alysis of a saeple f r o,s t ?. . >

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. ->, ' h, () fream Cenerator taken at 072f. supported this belief. Th e sanpl.

,d

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todine 131 level was 0.491 eierocuries per et11111ter.

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1 y~#ig. c.: g *. - Prmasurizar levd Transmitter (IC-1-t.r3) Iailed.

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_. .iTr* ?w e &. ' Emergency Precedere D-21, "Tetal L*se of Pressurizar Level IMic.atice* to... ~

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p;s. i 1- determina level. n " ..

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@f ~v q @ la preparaties for natural airenlaties, Staan Cenerater 1 was sta. ,4 to

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the condenser us1=g the Tarbine 37 pass Talves et 232 eyes. Due to ela -

!. a;.-  : ,.7.,;g

'.T -

et smaing,.1se.rmasse.is. air'berse radioactivity were detectad. Raspirators

'M..y,.y*,5 p .

.' were required la the Central Saae ier several misetas and La the Turbine .

,5,

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wilaims rer herves. cru 'te four seer.. all e==.ccasaan ren.=al

h. :.[i ]r W ware evacuated from t's.it 2 Centrol and Turbine Su11 disse. Initis.127 it was

... E,V::",'

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m thought that the high airberse activity Ied ,ias

.g.,~.- 79s

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.y-y v. 1.atar events show.d

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  • that the activitT *as test 1 7' eoen 133 with ca of Iance 1.11 and 115 C% *

..... .aJ -

wtx1.c.h had saturated tha,$4M-2 detactors and gave a fdse Iod1=e is41 cation.

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"he transities to .. natural circulati.s was accouplished at 14C3 hours by st' i it

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  • etopping lascter C+elast Pump *1 (EC-y-21). .

3 ens ceear.ter. A and 3 =vuru

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