ML19289G066
| ML19289G066 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/11/1979 |
| From: | Bennett G NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| To: | |
| References | |
| TR-790511, NUDOCS 7906260064 | |
| Download: ML19289G066 (2) | |
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N R C 5 :a v 218 U.s Nuc' E A R RE Gu LATO R Y COMMISSiCN OATE 4 76)
May 11, 1979 s
,::,3 TELEPHONE OR VERBAL CONVERSATION RECORD T'{g 30 l
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P 0 INCOY!NG CALL U OUTGOING CALL 0 visir l
PE ASON ct.LuN G C F F ICE!A C O R E SS P 40NE NUVBE a E X TE NSICN Gary L. Eennett RES/RSR FTS 427-0272 PE R$CN CA L L{C QFFICE AoOREss PHONE NUY8E A E XTE NSiON Ray Bootn ORNL/Instrurentation FTS 624-5555 CON V E R S ATI O N
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Ncise Diagnostics Succort for Three Mile Island Two
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C;*E sent a team to Tnree Mile Island in response to a request from D. F. Ross of h;; are wantec someone to lock at tne loose carts monitoring system at TMI to make l
s,.,re t ere aere n; s
loose carts in tne syster (Tne TPI 1;;se parts monit: ring ste is an AI s,ste using crystal-tyce accelerometers - an accus*ical systen).
j Ee:a;se cf tis fa-iliaM t.
aith the clart and aith the loose parts monitorirg I
s,s:s- (LP"2; F ;* _ ais; sog;usted Sii Zigler of SAI.
(:igier was fcrmerij 6
- ::; e : 3t 3in and ne carticic3te: in :ns h:t fan:tional tests at TMI-2).
TEC l
t nas als tr:acn in for censulta*icn.
All in all CRPR financed about six ORNL l
lem:12.ees,cneSAIemolcyeeandabaJ: tnree TEC employees to g: to TMI (nct all at tne same ti e).
r Cn:e at
~"1, tre noise dia; ostics team also stadie: the presssre arc tem;erature s1;rals, tct-ncise and dc.
The tecnniques used by ORNL are basically gicbal l
t,::s cf rase-e ents and would not be se sitive to small amounts of core damace.
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hew rtneless, ORN concluded tnat the system aas snut conn in the state it was s;;;csed :: te in.
0;'a also serifiea that the core barrel was in :ne normal l
configuration tuem ;r ;r 2n'.ai-of toe pressure data and LPMS data).
l In additicn to this work, CRNL nas
- assessed senscr operability
- determined the the pressure sensors seen to be operating normally 1
- determined that there were no loose parts in the system l
- developed correlations and modelled (with TEC) tne operation of TMI l
wi tn one puma
- CONTINUED -
A c cE A R c' TO -
- 7. E.Trl e/. L. S. Tong, W. S. Farmer, W. P. Beach, R. Bocth O ADVISE YE OF l
ACTION WEM ACTION R EOuESTED R.
M. Scrocgins[D.F.Ross,V.Stello, S. 4 Hanaaer, H. Vander Molen INiil ALS l
DATE
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telecon - Bennett to Booth May 11, 1979
- checked calibrations
- posed and offered solutions to "what if" questions on instrumentation.
Basically, ORNL funded a team of about 12 people (ORNL/SAI/TEC) who were on call to answer instrumentation and diagnostic questions.
ORNL also got into questions on subcriticality.
While the count rate on the ex-vessel BF-3 neutron detectors was too low for noise analysis purpc ses, the ORNL engineering ;nysics people performed some transport calculations to check the cc signal.
Tney were able to show tnat the count rate was as expected and that no increase was occurring (af ter making appropriate corrections).
The concern about toron plateout was elininated.
On Fridaj of the week tnat TMI was put in natural circulation, the noise diagnostics tear went to TMI again to monitor for bulk core boiling using temperature noise.
Iney again concluceo that no bulk ooiling was occurring.
ORNL also did some work on the TMI sel f-powered neutron detectors (SPND) inside the vessel.
The reacings from the SPNDs were high, but ORNL thinks this is caused by a cortination of moisture prcblers, therral snock and decalibration.
ORNL is currently working to document all of this work, including the boiling noise experiments run in the Thermal Hydraulic Test Facility.
They are also reviewing tneir programs for possible changes in response to TMI.
Costs so far have included about $32K to TEC (involving about 500 person-hours of work).
SAI put in atout 500 person-hours and Scoth's development staff at ORNL put in another 700 person-hours.
Cost of this work on noise diagnostics and surveillance will be accut $100K.
Other ORNL instrumentation and controls staff members put in another 5C0-700 person hours on temperature sensor response / calibration, thermal-hydraulics, event sequence studies and general I&C support work.
Booth noted that EPRI is putting together. detailed chronology of the TMI events.
This chronology will be provided to the Presidential Commission investigating TMI.
EPRI wants ORNL to help them with the preparation of the temperature noise analysis work.
Fry and Kryter of ORNL will probabij visit EPRI in a few weeks.
Otherwise, the ORNL work on noise diagnostics for TMI is completed except for further analyses of cata, reports, etc.
NOTE: ORNL has an operating automated monitoring system in use on the HFIR reactor.
I asked Booth for more information because of the possible relevance to post-TMI research.
Also, Ecoth has talked to Dr. Michaels of HEDL and it is possible to use noise diagnostic metnccs to detect leaks in the primary system.
This will be discussed furtner during the June 1979 Noise Diagnostics Research Review Group meeting.
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