ML20136B637

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Submits Chronology of TMI Incident for Period 790328-0401
ML20136B637
Person / Time
Site: Crane 
Issue date: 04/06/1979
From: Conver S
NRC OFFICE OF MANAGEMENT AND PROGRAM ANALYSIS (MPA)
To: Gossick L
NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO)
References
TASK-TF, TASK-TMR NUDOCS 7909100051
Download: ML20136B637 (20)
v • d • e


Text

Q -( h la..u

'h April 6. 1979 j

N0TE TO: Lee V. Gossick f

FROM:

Steve Conver

SUBJECT:

CHRONOLOGY OF EVENTS

,..s Enclosed for your review is the chronology that we have put together to M

cover the period March 28 through April 1.

We have arranged all the entries in chronological order, and the source of information is indicated for each

~

cntry.

.J;-

We have considered the following sources of information:

'N 1.

PNs and Press Releases.

t' 2.

The log maintained by SP'in the Response Center.

~@

X 3.

The IRACT' tape of all telephone lines in the Center.

.g (We listened to all 20 channels for the period 8:21 a.m. through 9:16 a.m.

on March 28. - We didn't have time to listen to more, but most of the initial notifications were complete by 9:16.)

n 4.

The Region I Operations Center log (which Jim Allen had hand-carried 1

[

to us late this afternoon).

i 5.

The IRACT log of all incoming phone calls (which shows only the. caller

~.

and the person called, not the subject of the call).

f9

.e 6.

Your personal notes, which began on Friday, March 30.

i 7.

The notes maintained by people working the various desks in the IRACT.

,'.-j A notebook containing our sumaries for each data source is also provided in case you would like to see any supporting detail.

7' 3

Per your instructions, we have tried to hit the high points, with particular l

emphasis on the various notifications within and outside NRC.

We undoubtedly

,[

have a better handle on the former.

However, the SP people have prepared a ene-pager indicating how each of several states and federal agencies first learned of the accident.

I talked to Shelly Schwartz at home tonight and

~7 suggested. to.hfm that you would also be interested in establishing NRC's 9

first contact with each state and federal agency.

He said he would get right y

i.

on this in the morning, and he may want to discuss it with you.

.'y I have been in contact with-OPE who will prepare the Chairman's testimony.

To satisfy the Chairman's' wish to have. draft testimony to take home this weekend, I think we should try to get the chronology to OPE as soon after noon (Friday) as possible.

Therefore, we would like to circulate this draft

.M

~

(or a revised draft incorporating your coments) as early as possible this J

morning.

I think,we would benefit from having a number of people review the j

.5

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-jy 790910065

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'chronclogy. At a minimum. I think we should give it to you, Davis, Case.

i Thompson, HRR and IE representatives at the site, Region I. IRACT people.

State Programs Public Affairs, Congressional Affairs, and Comissioners' Assistants.

Some of these people may be able to make significant additions er changes to the list.

.,'J Bill Maher will be in as early as he can tomorrow (Friday) morning, and of I

he will be awaiting any instructions you might have.

The rest of our group will be in as soon as possible.

Please let us know how you would like us to proceed.

g P

$W-

'k Steve Conver j

Attachment:

As Stated.

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i Combined Chronology of NRC Response to Three Mile Island incident Date/ Time Source _.

Activity

_ ed. 3/?R JF(*%%M/ f.

PEMA(P'enna. Emerg. Mgmt. Agcy.) notified by l

W

._7:02 AM lic_ensee.

4 7:45 AM PNO-79-67 Licensee notifies Region-.I of incident.

t 8:00 AM Pub. Affairs Fouchard notified by Region I PA.

I~

(Ingram) 8[9-8:02 AM i

Reg. I (Jim Reg. T (Bo E

Allen & Eldon Bruner).(John Davis)yce Grier) notifies IE Hg.

i.

t' 8:05 - 8:10 AM John Davis, IE John Davis orders Sam Bryan to activate

{

incident response center, (IRACT) i 14-G7

!.4

.4 8:10 AM PN-5T Reg. I activates its incident response s

center.

i 8:23 AM IRACT Tape Phone call from Weiss and Moseley to Boyce Grier( Reg.1) getting information

.}-

i on the accident.

~

8:25 AM Incoming Tel. Log Gossick calls Davis.

i 8:31 AM IRACT Tape Moseley #AR notifies Stello & Eisenhut, jJ

- Stello says he will send radiological expertsJfs /McX.

8:32 AM IRACT Tape John Davis calls L. Y. Gossick.

i 8:34 AM IRACT Tape John Davis calls Denton's office; speaks to Case.

8:36 AM IRACT Tape Davis calls Hendrie's office; speaks to

}

Bill Dorie.

Several calls made tr*'7-% !

t to reach Hendrie; finally contacted by i

.t at (place)

(

AM).

I 8:40.AM IRACT TAPE Mike Wilbur calls Boyce Grier; obtains

}

N'MO technical infonnation.

Ress@ Z i

8:45 AM Reg. I. Log IE Team leaves for site (g[nspectors) l 4

8:46 AM IRACT TAPE Davis calls Dorie, asks for Com. Gilinsky l'd s

in Chairman's absencei Gilinsky not in yet.

5:

?

..,.. _ _ _ _. - ~ ~... -. _ - - - - - -

, if.

c.

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n Date/ Time Source Activity

'7:'

a

'G k!N8 kh IRACT, TAPE DudleyThompson notifies Tom Carter, NMSS.

f.

No NMSS action required.

..y 31 9,

4i 8:49 AM IRACT Tape Ward notifies J. Davidson, NMSS to make I

55 II ' '.M i

i IAT notification.

I]

j 8:50 AM renmesesF&-

Licensee call to Reg. I with current i'

-.g ExxRt Reg. I Log status report.( p,,c.vr. g,r m pgs w x

_ft,- 1 o

yg l

til

.-. a.A.#cnnser,<aause cs y

,e 8:52 AM IRACT Tape John Davis notifies Commissioner Kennedy

4

.fd uit,o i.

%:~4

(a rd.r was the first consnissioner

'I.

?

.S contacted).

Davis reports that he, i

1 5

Gossick, Case, and Fouchard are manning b,4 i

IRACT.

Kennedy says he will notify i

Q

I Gilinsky's office.

.l

)r 8:56 AM IRACT Tape Gossick attempts to teach Gilinsky through Bil) Dorie and through Gilinsl&'s office.

i i

Gossick talks to John Austen and suggests

[

s

- a that-Dorie personally notify the Chairman.

}

7 i

8:57 AM IRACT TAPE Day.is notifies Commissioner Ahearne.

-Q.

c 8:59 AM IRACT Tape Bernie Weiss calls DOE Emergency Operations D

.a

.-f Center.

h L "hf[

9:02 AM gRgC) Tag-Weiss notifies EPA 9:08 AM IRACT Tape Joe Fouchard calls Carl Abraham. RI Public

~!

g Affairs.;

i a

e 9:10 AM.

IRACT. TAPE Gossick calls REMpiRBEL Congressional

[

.29 s

i

.G Affairs Office.

Randy Pine informed Gossick l

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that CA had reeleived several inquiries eg v

i 3

from 1ocal Congressmen.

i.

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1;00 Se f f y a.,

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9:03 AM Reg. I Log Maintaining open line w/ licensee at site.

3 I

t Date/ Time Source Activity

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Wed. 3/28'

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9:00 AM IRACT Tape Bill Ward informs Randy Pine (CA).

(

Randy Pine. indicates that she will i

inform local Congressmen (Heinz &

f Schweiker.) and Rep.

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9:06 AM IRACT Tape Bill Ward informs communications Branch, f,,

9i10 AM IRACT Tape Grier calls Moseley to explain 1'l technical aspects of incident.

Y..

9:11 AM Incoming Log Gilinsky calls Gossick and Davis.

9:16 AM IRACT Tape Fouchard notifies DOE Public Affairs

.h office (Bob Dulin).

After 9:15 AM:

5u

... Other NRC personnel began arriving at Incident. Response Center. (IRACT Tapes not yet scanned for times after 9:16 AM)

~

9:15 AM IRACT Notifica-White House s'ituation Room co'ntacted.

tions Log 9:27 AM Incoming Log Defense -Civil' Preparedness Akcy (DCPA)

,y 1

calls Joe Hegner.

'.f 10:05 AM PN 79-67 Reg. I response teein arrives at site.

.f 10:20 AM SP Log Telephone to Pa. State Rad Health Dept.

i..

~

(Gerusky not available).

Call returned at 10:45; subsequent call's every hour or two, starting about 5:25 PM to discuss

.d status of sampling and monitoring.

f.-

10:16 AN Incoming Log Conference call: All Commissioners and

~~

Davis.

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i Date/ Time source Activity

.I Wed, f[2T

[

10:30 A8 PR #79-64 First Press Release based on Preliminary Notification.

[

?

10:55 AM SP Log Press Conference (from where?) patched

.E through to PA Rad. Health Dept.

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t i

10:40 AM SP Log Telephone call to PA Civil Defense

j (second call to Operations Officef at j

i 11:30 AM).

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~

10:58 AM Incoming Log White House DUTY. OFFICER to Weiss.

j 12:59 PM Incoming Log Region II to HQ (O'Reilly to Howard).

f.

i 1:01 PM Incoming Log Stello to Henry Myers.

{

1:12 PM SP Log Telephone call to Va. Civil Defense j.

I y

re rumors.

4 3:00 PM SP. Log

~

~Propos&d NRC Press Release cleared with Pa. Rad Health Dept.

3:45 PM PN 79-67 First PR distributed inside NRC.

I Sted 5:00 PM PR 79-65 Press Release (554 3

SP Log Call to Pa. Rad Health Dept. to say

i

.9 7:55 PM z

ARMS data shows count is up and gave

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_f c'd status of BNL monitoring activities.

6:15 PM SP Log Pa. Rad. Health Dept. called; says'.

they have ARMS data and said they are, I

i

'l keeping Governor informed.

i.

I 8:17 PM

' Reg.-I Log Notified of decision to send NNR team

}

to site; expected arrival next AM.

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5

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i Date/ ime Source Activity

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i Wed. 3/Z8 9:00 PM Region I Log Notified that Salem providing equipment.

i 9:00 PM SP Log Verified (how?) that FAA had not been I

notified, i

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.i Combined Chronology of NRC Response to Three Mile Island Incident Date/ Time Source Activity

~

3/29 Thurs.

I 12:15 AM PR #79-66 Press Release 3/29 - 4100-Q Log Notificat.fon to Defense Civil Preparedness llco()rn

',b Agency; read press release to them.

g 3/29 - 9266 6 h Log Telephoned Pa. Emergency Management 2.'e&n i

1 I

Agency, read them press release.

3/29 - 0240-M Lod' Tried to telephone Health Center for

.2 ',/o kn Disease Control (Atlanta) (Pa. Radio-logical Health said they would try again in morning.).

i 3/29 - #830 thy)

SP Log Called H. Calley, EPA, to read press

-re. lease and suggested he call Gerusky and

.i i

offer assistance.

3/29. - f930/fn1 58 Log Food and Drug Administration called; They offered to have Baltimore field j

off. ice provide assistance in looking

'f

'l at food oathwa 3h;

/0 a f"ah

/'/V ~ 674n vi 4 M ~ys.=_L.

t 3/29 - 1100 A-ty)

$ flog Tried to cont'act N. Y. Bureau of Radio-l 7

logical Health (Called again at 1817hnd briefedhim).

.l 3/29 - 1105 $m gfLog Called N.J. Dept. of Health and briefed

[

1 2

them.

3/29 '- 1145 ftIn 6[ Log

Called Delaware Rad-Health Dept, and l

l briefed on status.

l

2 Date/ Time Source Activity

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. :l 3/29 - 1205 4/o Log Returned call to Gov. Ray's (Washington)

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assistant.

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3/29 - 1210 ffyl 6[ Log Called W.,Va. Rad. Health contact

, l and briefed on status.

E 3/29 - 1215 OTY\\

MLog Calied Va. ' Radiological Health (Tried

'1 1

to reach again at 1250; finally reached

{

contact at 1315).

l-Approx. Noon Unverified Strasma Region III PA liaison on site; 4

i

..i Vollmer +7 (NRR) arrive on site.

l 3/29 -

9 Log Telephone Fish and Wildlife Service.

.1 ) ; - M.; d ".3.c e P. n

,PN <t *) G W A-3/29 - MM.-

S P Log Briefed (over telephone) Md. Radiological l

.t 3.'C'Iffn Health on ' status of samples.

t

,i 3/29 - 1446-S Log Inquiry from Minnesota Rad. health; gave 3l3iG?m status briefing 3/29 - 4466 NFq.T Ace The Executive Management Team directed C W /h G

the ifcensee to stop duging all water.

,j

~

RI notified HQ that the stopping of the dumping will cause backing of water into the Turbine Building.

(Late entry - the licensee has been i

dumping water to.the river -- the water 4

is within TS limits W.R.T. contamination.)

.' ' at 3/29 - 1800 Lo9 77 Pa. Rad. Health said okay with them for I

t.

rad. water dump; NRC can make decision without checking further with them.

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~ 3/29,4440-

.S:

Licensee notified NRC that he is b'loPrr)

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a stopping the discharge.

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i 3/29 - 4:00 PM

. G=9L.

Z Elsasser reported regarding briefings provided Sen. Hart, Heinz. Simpson (Wyo.) and!

Ertel.

Questions were answered b*y NRC.

f 3/29 - 5:30 PM M

TI4M Elsasser reported regarding briefings provided by Met. Ed.

Sen. Schweiker,

,i Congressmen Gooding (York), Mike McCormack; i

Waller (Lancaster). Weidler (L.I. NY).

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' - - - 3/29 - IM5 Y Log Pa. Ifad Health called back; said to

.lo:$5Pm hold river du.mp because of Governor's concern; gave them update on ARMS data.

3/29 - }995 N Log Offer from DOE ' Emergency Assistance n:omo contact (Joe Deal) from Harrisburg 4

airport.

8'004'.30on a

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3/29 -3999-000 7 T F Log Updated status reports to Md., W. Va.

ii and U.S. Bureau of Rad. Health.

3/29 7

-Reg. I Log Periodic ARMS flight hour intervals.

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3/29 - g m M Log Pa. Rad. Health says "go" if NRC

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ICM8tri wants to have water dumped.

1 T Acp ' ' Industrial Waste Discharge verified to be 3/29 - 10:12 PM (edia off.

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. _.................. ~... - - - - -....

~

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4;;

combined chronology of NRC Response to Three Mile Island Incident i.

s i'

Date/ Time Source Activity-i5

~

3/30 - 4085 HPE5lT EMT asks IE/ site-to relay to Met. Ed h

13.'l58tr>

E l

that NRC says OK to release industrial i

waste.

Notify NRC when release M

comences.

4 3/30 - $206 th?)

G4G-I Industrial Waste Tank overflowing 'onto ground.

~;

3/30 - A535 -ht G-44kg I Fire in Unit One Aux. Building Basement -

(picked up from intercom).

Fire in ventilation system.

~

3/30 - 0800 frill

$g,? ' Log Status report t'o EPA 3/30 - 0820 Ayn

$/3 Log status report to FDA, Bureau of

~~

Radiological Health 3/30-08308y7)

-50 Log Status report to Md. Rad. Health.

3/30 - 0850 Am 4 P Log Call from FPA re. questing status (?)

3/30 - 0925/tyr1 M M f. k T h State notified 'of release - avacuation A

s 6

rumored - site does not plan to call for evLcuation.

i.

i e

3/30 - 0915 to

$ P Log

^ Calls to Pa. Civil Defense re potential y

~

1010 Pfrh

^

s F

evacuation.

E

~

H 3/30 - 9:50 % h PN 79-67B PN 67B Issued.

4 5

3/30 - 1000 @ 1

.G d a

-C Evacuation

.some confusion - evidently

~

State has recomended evacuation 6f i

't

'Middletown (Doc Collins). Plant /NRC c

~

.[

has not recomended evacuation.

~

. ~....

2 Date/ Time Source Activity 3/30 - 1025 k

-@ c&

lar Lost communication with Unit 2 Contrul room.

3/30 - 1030 b icest TN&q 1045 State has advised residents within 10 0

miles to go inside/ shut windows.

t NRC position remains - no evacuation /unnec-essary to take any special precautions.

3/30 - 1145%

-1 Hie.

T Release at 1109 for ?! 15 secs.

i' k :og 3/30-12@3k/h C T Chainnan of NRC recommended to Governor of Pa. to evacuate 5 mi. radius.

3/30 - 1207hm 640

[o EPA, Region III advised of evacuation reconunendation ' ~

3/30-1230fn?

.S 44-3~

The NRC evacuation reconsnendation'has been changed or is clarified as follows:

pregnant women and preschool children in the 5 mi. radius should be evacuated.

This recommendation to Gov. Pa. - not public.

Dr. Langford of EPA was notified of this change.

3/30 - 4300.

g[ Log llc0fm Another conversation with FDAA re Governor's reconnendationF _,.,.?h.,.w'+%y E

e.>

ational Security Council meeting at 3/30

""5 %

gLog

\\

1330.

}l15T.4!39,o

. MSG-calls to Md. Delaware, N.Y., N.J.,

Va., W. Va. Rad. Health regarding Governor's recommentia.t. tan

~

3 Date/ Time Source Activity

.3/30 - 2:00 PM Mossburg Denton +12 arrive by helicopter at Gossick Notes site; NationalSecuritFCouncil called., President wants to talk to Denton, 3/2 - N in NRR Operations Center established at 3;'50 fin nearby residence; notifications to D

. President Carter and Gov.,Thornburgh.

~

[

3/30 -4GM-PR No. 79-67 Press release "no inuminent danger of f-W.3oPurs core melt; technical experts (Denton et al) on site" 3/30 - approx.-

Unverified Wayne Kerr plus 5 arrived at site to 3:30 Pm i

. assist IE Health-Pigsics.

e (By this point, 83 NRC personnel on site and in vicinity (51 IE.4SP.3PA,25NRR).)

3/30 - 9045 M

Th.27 (Madden) acting as Administrative Officer T46P!r)

. reported the following:

- Trailer, manned ty HRR (Denton) and the White House Communicatiors Group 1s now behind the Observation Center and wired for use.

Additional Trailer by 2145 will be wired w/6 telephones.

, - - Boyce Grier is downtown in Harrisburg at a Press Conference w/Stello, Denton, Gov. Thornburgh.

Air National Guard Unit at Harrisburg

-..y w-

,n,

.,.,,-,,,--n,,,,,_,,,.-,-,_n.,,

-,,.m.

,c,,,.

,,_wq_-

Combined Chronoloqy of NRC Response to Three Mile Island Incident Date/Ti$ne Source

" Activity 3/31 - 0125hTl Sflog Coordinating meeting held at Capital City Airport (EPA, DOE, Pa. Dept. of 3

Environmental Resources. FDA, NRC).

3/31 - 0350M

$h Log Telephone call from Bettis, Radiol,ogical i

Assistance Team at Connand Post at Capital City Airport; analytical equipment in airport hangar.

3/31-0600[1m (Pd4 k I Oak Ridge man believes he can use the Loose Parts Monitor to tell the size of the bubble in the vessel.

'Cail from Pa. Civil Defense; provided 3/31-0625bh YLog status update.

y 3/31 - 0900 approx.

Public Affairs Center activated at site; limited operation until 4/1 3/31 - 0830"% n Trailer moved just outside plant. gate.;

approx.

NRR operations center in full force.

3/31 - 0917 Am MLog Call from HEW asking what their role would be if evacuation.necessary; said Pa.- Civil Defense has lead and referred to them; gave status update.

3/31 - 0925b 4

Log

' Call from CEQ; gave status report.

3/31 - 0920 M $ h Log Call from N.Y. Rad Health Bureau; gave status report.

3/31 - 1000@@ ' $h Log Call from Defense Civil Preparedness.

Acency, cave. s.tatus report.,'

s l

1 2

Date/ Time Source Activity 3/31 - 1200 to

$DLog

,1230Sn Conversations with FDA-Bureau of.RadioloDical Health re supplies of potassium fodine.

3/31 - use-SP Log Pa. Rad liealth Dept. agrees to refer W!bS all calls relating to health matters 'to NRC.

3/31 - N.

Log.

Informed that Governor. W.' Va. had 6.'ob Pm activated State Radiological Assistance Team.

.3/31 - 10:45 PM PN-67G NRC representative (Stello?) at facility informed.that sabotage attempt would be made during the night.

FBI. Pa. State police 'and licehsee were notified.

P t-)

Combined Chronoloqy of NRC Response to Three M11[Thland Incident Date/. Time

_S_ource_

Activity Sun. 4/1 4/1 - 013007t\\ SP Log Called DOE Conmand Center (they do not know where EPA people are); also called Pa. Rad Health; EPA lab is next door but no one there.

4/1 - 081 e m s P to.

caii to ra nad seaith (ooE' wiii collect all data and transmit results to NRC).

Meeting scheduled at 0830 to set up coordination.

4/1 - 0936hl ) $P Log i

Contact established by Lubenau/Vaden at Pa. Rad. Health offices,

_c P,g 1 T Q -

- NRC Personnel on site (65 I&E; 27 NRR;

, - 4/1 - 1110 ?:M 5others).

8Ste-4/1 -

PN-67H NRC ' established 37 TLD stations at distances from 1 to 12 miles from plant.

4/1 PN,67H All utilities with an operating B&W reactor were sent an NRC Bulletin' to:

(1) provide info. on 1MI-2 incident (2) require a, prompt review of their plant conditions, (3) take action to prevent such an incident.

NRC inspectors are being sent to each licensed B&W

. reactor to provide increased inspection g

coverage.

~

--n-

-........ ~.....

1 Combined Chronolocy of NRC Response to Three Mile Island Incident

_Date/ Time Source Activity 4/2 - 0335 1 -00, 1.6t '

Hg. requests licensee to send sample of

~.

containment air (2330 sample) to Bettis.

4/2-0550[m 644 1

Phone link dropped out/IlQ will try to re-establish conf. call.

4/2

.0625 k 6

I Phone link re-established.

4/2 - Midnight Gossick Notes Denton briefed Governor of Pa.

O o

s e

2

_Date/ Time Source Activity 4/1-w.

-e=Spg C'y President Carter is on site in Unit 2 W

9;fC-3437 Pin Control Room.

4/1 - 8:40 PM Gossick Notes talled DOE /EOC to request cleanup of AUS Building... General Public Otilities requested help.

a J

E g

e O

g t

t 0

4-4-79 C

JLfe

(~ Q s

.L.

-d" =. Z NOTE FBI: Edson Case, Deputy Director Ef-R;S f

R W-9 Office of Nuclear Reactor Eey2Tation G.f-[p Q

FmM:

Robert 1.. Tedesco, Assistant Director

.hm 2 n.

,f jkW) g

(

  • q@

for Reactor Safety, DSS s

s.9

SUBJECT:

PROPOSAL BY BW TO MET ED To ADDRESE STABLE C03* ING sd l

iM r.I'3 MODE: TMI-2 q

I-L-1.N p

-rip:q A revleiwas made of a proposed plan to nove from the present code of

?f.{Q th operation (f.e., pressurized to 1000 ps!) to a stable Tong ter:: node f? ' $

~

g22A 3 of core cooling. This review was perforced by:

fcp

.+. - r+

YX1ik

?

Charles Graves Ron~Frahs f

Erk15 Norcan Wagnar' Dan itoT. herg (IE)

. " !'i

\\p H x Byron 51egel Frank Crr

$$$1 pg]

Jim Watt Zolten Fasztoczy ft'N Mark Rubin Gary Mc7ahan F;:2G

'{:Qf

- W 9j I~~

The proposed plan basically calls for ple.cing the systes into the h --19

$YES natural drculation cooling code. The RiiR system is not to be used Hid

.;.?
a becattse cf the high activity level in (fie reactor coslant.- On,the t@s~y basis of car review.the following recomendations are cade:

lv.B E;iO5-pt (1) Y.aintain as long as possible, current mode of cooling; f.e.,

@ihi Wh na$(

EP and pressurf zed at 1000 pst with degarsing taking place.

Q:

\\,e

?

.' (

R N,f lk

~

y n._

h$m y

  • "W4UU b

.. "4,7 @71'00#3

$$Ij O

f i

c. -

r Edson.Cas2 '

, Q.

Q..

4%

W3h

+

Er.o if level Indication was h4 we would reca2:emi corttinuing

-). :.

p

'is tists code with theWolicefny w;pstion

?

cI

--.,.2, jfg

' (a} ccc,tinue to monitor core thercal instruments - inlet. and M..m; o

k pNd Nb h

d5,.

w-(b) 1eep reactor cesling pump in operation ur,tti cut-off pressure

!g b:E" l

is reached; b 9 %

E.

- :r (c) censure systes pressure (go solid but keep pressure below I.QQ L..

gAk~

s 2000 psi);

ji l

(dJ mintain heat balance - input '- makeup - heat ren,aval; l'N gj

%:;.Q (e) establish centro 11ed depressurization of the system to a

$9J0?

pressure less) rbeut 4taupcic.

p5$

iSIM f'[27 g =;.

h !?.e event-RCP failure appeared kninent,'try to restart other i.hod

$wps. ta r.sintain this preferied.tocitng node'fo' es Tong as F..% e r

, ~'-

^

9 pasible to alles decq heat level to decrease dafTy (-4-5% re -

Mb 1

s 5 er day).

p.

Acti:

P c,,.

3

.r3*

u (2) In the event. that preferred sede cannot' fie maintained, then the-I 3 -

wenmnded r.ede of natural c$ren5atio6 wGl become necessary.

?

1 n

Dere are some espects here that meed to be considered.

fi~h

. x ;

=

if tts. core exit themocouples are correct then it th apparent that f.i" g

}5+k4 l

very11ttle flow is going through the core. This could be the

=e a

tsdt of widiispread flow blockage (90% to 981 tn all'assembifes).

w J,....~..

S i*

N l

%:g w

?.:

's r.;;

..[b ;

.$~2

,Qo o

b

idson Case -

j m.~,

Mj es. it enuld be the rasvit of reduced core inTet flow, caused by 159C t

'?

.4 stud opened vent valves, plus Test extensive hicetage in the W

ccre {-90: blockage fa 2B% of the MWifes ad15ttia or no l @?

[Lsr

, blodege in the remaining B01 et the assechlies}.

In either t!q:p care core coating will. La difficuh 2$ the refaced he rates g.

l p :4 c.vailable from tratural circula tion er fr,o:s the RM pumps.

C.P i; ' d

)b.:.

On the basis of results from natural circulation tests at Oconee,

. t;.%.:

e... -

It appears that 12 to 2% of full fim would be anfiable from W.M i! @

r,atuti circulation if the vent vsYves were closed and no core d;jg

.W 1r$.

blodage were present.

The int retuits and 834 calculations in-j dlL-;&

tM,?$

dicate a relationship of 4% to 101 ficw for each li of power in

!. f tHs pacr range, Since ibis.flos rete is corpsrable to the flow Efg%

!; 2..

ri'.a fros the RUR pmps, the. e does r.ot appear to be an advantage ii

$m ii. A to chnring RHR c+w ratwa3 citcchtian.

It mt be noted that.

(t4Jge If G thm seuid be difficulty in initistfoy natural circulation

%[.$;jj kg becease of possible core blockage and/or opened vent.valv'es.

L.TA

$iH

-It is rat clear how effective natural circulation weuld be when-3rq y

the turent heat livel is low.

In the ife!t, there could be no b-2%.m

[m{

ffM-its.the core would sit da a pont af water and boil which would

[

help t[re:::ove the dec4y heat. Depending u' hon when this code P5q-s T;

?m

~

lf$h

!b.?-

M a:+

.a....___

_.,, g i

i

..Edsen Carr i!

.i of ccemg. starts Ete.preseme cf hot spots uso dettScine e'ne'.he we would es;cct further owe decapi

.3257,., the longe.r jy%

.we r.aintain present cooling, the better will be the core situa-Ih

~

w==

tion.

?&

. gy g

in%

Another node here would be to go water-solid in the secondary ~ '

N syste1 to inpmva natural circulatten. Flow would go to the hot

,0.M PW vePc ieri he recircuiater2, tmderation would be needed for

[ NT b4

.i -- O bracing the steam lines, particularly the stea:: lines inside g

i m

the contaircent bul145ng.

( -.

. hs 5%

(3) Depressurization effects have been considered in our review.

Mg 2M Scea n:n-condensible gases remain in tite prir.ary system. We igg esthne a rate of pmbacthn of 2pproximate'ty 3?-E ft / day h

3

~

,.IN of H and 02 (1003 psT=) due to radiolysis in the core. We 2

!.3 are told by experts at KAPL that',the 'patentiaI for recombination 8,5]

.. ~

my is pod provided there f.s no boiling g

w=t We h1 It seems preferable to delay depressurization of the system gj;p

p5f, to that gases in the coolant would not be released and boiling v;d f cot occur. 16xcvar, while we still have the instrutenta-j]

E tion, it would be helpful to depressurize slo,ely to obtain in-4 P23!

forcation on the amounts of hydrogen pas that would b,e released.

1 r

4

y=m K

' $g2

! 99' sa e.- : 4 e:s::

.i l

[

Edson Case ~,

@i:<

tb This inforcation vauld be helpfr1.~rs later dr.itie.s and actionst

..$ws itqui e.g., in the event depressurizat&.a necds to tne pizte, then lQ (hfe dagssing would be necessary, h this regards as6ers of the

[g$,,

I.,..pg L.e@

AC'$ s.:ggested thet w-etteep to essess the eMeet cf depres-scrization by depressurizing THI-2 by hbout 200 pst and censure the g-g:

p off-gas. via the icvel technique.prerfoesly used, I have discussed 16 l A"E this with Roger Mattson at the plar.t. linile he agreed with the

(($]

constderstion, he $r4 State 6 concern shout introB1cing any pertur-

&wi

!#m batire.t to the pital at this 13:e. How:ever, he. we*ald discuss this aspect. further and get back to en.-

f(fh n,as:s p - -'7, c 3 m.p@

w

'jj3 @

In vrrtry, we believe we sh uld ntie acry effort lo s.-dntain the present

~m l$h'jj;

~

pressurized cooling r, ode for as long as possible.

In the event that we

  • mea lose thli, then go onto natural circulation cgsin pressuri:cd.

L.'c should

((6.ij pm

,m onlydspressurize when absolutely necessary.

g@t.g fr !9 PM s{;yg

,,..g, nie therefare are in agreement with the proposed plan c2 cept ttfat we not s

f, g'f.f em p ccte natural circulation.

(Note: Eark Rctin q m tions RCP code T

witted Icel indication.

I believe va have ad&ctsed his above.)

4.y G-4@

Ws

$gEl v

Robert L. Tedesco gs w:.

MPJ

  1. B2 5 52 9

.n

  • 4h wwc

?,

J

-.m.

g' UR& lLU 3 tM 8 03 CLASS OF SERVICE g

NUCLEAR REGULATORY COMMISSION L, c.-

0FFICE OF INSPECTION AND ENFORCEMENT EEE!.

WASHINGTON, D.C 20555 URGENT-IMMEDIAT@

i ASAP m

FACSIMII.E SERVICE REQUEST (35 1

DATE:

I, 7

HESSAGE TO:

b (Name)

(Office / Division - Agency / Company) l g

Mi STATE AND CITY:

bl[b T4!E 3lEE TELECOPY NUMBER:

AUTO:l.

YES' NO (Rapifax - 50 secs./page)

(3-M - 4 Mins

/6 Mins _

)

(Xerox - 4 Mins

/6 Mins

~

OTHER:

(Transmission Mode:

Hin tg.

Wi VERIFICATION NUMBER:

No. OF PAGES EXCLUDING COVER SHEET-RETURN COPIES - YES B

MESSAGE FROM:

J NNCE 1o DE SR I1 (Name) j (Office / Division - Agency / Company)

BUILDING: EAST WEST TOWERS j OFFICE PHONE ~

TELECOPY NUMBER:

301 492-8187

- RAPIFAX - AUTOMATIC m

301 492-7285

- 3M VRC AUTOMATIC

+. - :

E 3U1 492-7264

- XEROX (4001) - MANUAL j

VERIFICATION NUMBER: 3C1 492-7928 - (Bethesda MD) ia m l

g..

R...i...,T,

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i 1,.ns. m..,14 0...

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