ML20212H271
| ML20212H271 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| 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) | |
Text
-
Ag- 'M dept.
19,~ 1 yc6 -
All.
R. Elecch, Rocctor l'rojectc, Section 1 A,
'e 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 85091589 PDR ADOCK 05000PDR
(2) in Unit 1, ac coon as reacible via tne Fq? lirector.
.oul' 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 direction of R. Leaton, among otiiero, by GPU, under the of the _as($dr pathways ; or oof-gao for Unit 2 ic listed as one of 1:)'(j.
Lo n!'.c f t o.i.
gaceouc relma s durinc the Ti:I Accident, the 13 Generator are said to have containnetml the ceconder, ci:
e, 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/ cteo I
tube relearn to cay, a filter would be nico.
froa the GFU-Alco enclosed with thic letter are two excerpto 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.............
Th' e,econd from the r under Jzibitn or a
201,3 the ca::.c day.
that the ca:r.ple also confirmed the I rinary to ?ocondar / J ":.
docc not specify whethet the saii;Je in the 13 Ge nerator, but 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.i <)1 nicrocuries por milliliter.
t 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.
could that activity have crinted in I be lie ve w het he t.a.e a nt via s,
the prinary side, of 1131, et that tir.o 20h), in th" : quence.
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 to "naturvl circulation.
Bothe 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-
']
relation between this venting and the increase in radiation levels ination of strip chart recorders shows a strong", repetitive cor-X p
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
I l
the exhaust monitor peaked at 0715, then decreased and stabilized
(
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
\\ 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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.f having dif ficulty centro 111r.g the level of Steam Cenerator 3.
Emerge i
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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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- y.*(.f admitting f eed water to 5 team Cenerator 3 by cycling E:wegency Feed '..
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. 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)
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Eoargency Operating Procedure 2202-1.3 to preclud. :Ae ;oestti
. a u..n* *'i of damage to the knactoc Coolaar Pu=p f rom operacia G.. %.
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~ ~ U -j 01:13tA2-Reactor Coolanr. Pump l'8 (RC-F-18) was stopped in accordane.
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vith Energency Operating Procedure 2202-I.3 to preclude the
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blief Talyw (IC-172) outler. tecpera ture. A value of 283 0T w.
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fream Cenerator taken at 072f. supported this belief.
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7 Due to ela
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