ML19281B636
| ML19281B636 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/11/1979 |
| From: | Lafleur J NRC OFFICE OF INTERNATIONAL PROGRAMS (OIP) |
| To: | Abraham P, Cunningham J, Simpkins R INDIA, STATE, DEPT. OF, UNITED KINGDOM |
| References | |
| NUDOCS 7905300370 | |
| Download: ML19281B636 (2) | |
Text
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MN[. [r[d TELFGEAPHlc MESSAGE
- 4., ; 7 F'.uf CF AGENCY PafCEDtNCE SECutrTY CLA15tFICADON U.S. NUCLEAR REGULATORY COMMISSION PRIORITY UNCLASSIFIED
'C" OFFICE OF INTERNATIONAL PROGRAMS WASHINGTON, D. C.
20555 TELEX WO:
710-824-0415 ACCOUN*NG CLASSIFICATIQN CAII PRfpAfg3 TYPE OF mfisACE 4/11/79
-m
_ _w/
rea NFORMATION CALL
'OC" s
Per esin we m
JOSEPH:D. LAFLEUR, JR., DEPUTY DIRECTOR 492-7788 U """"' * '
THIS SPACE FOR USE OF COMMUNICATION U (T MESSAGE TO Bf TRANSAuTTED (Use 44.4/s gaseg as4 all sesa.illatte.s)
TO:
NUCLEAR ENERGY BOARD J. H. F. JENNEKINS, PRESIDENT ATTN: JOHN CUNNINGHAM AECB 20-22 LOWER HATCH STREET ATTAWA, CANADA DUBLIN, IRELAND TLX:
053-3771 i
TLX:
306-10 DR. CLYDE MCCLELLAND l
P. ABRAHAM U.S. EMBASSY DAE SAFETY REVIEW COMMITTEE OTTAWA, CANADA i
BHABHA ATOMIC RESEARCH CENTRE TLX:
0533582 l*
TROMBAY, BOMBAY, INDIA JU SUNG i
ROY SIMPKINS CCNA i
U.S. EMBASSY 4301 CONNECTICUT AVE., N.W.
EELGRADE, YUG0SLAVIA SUITE 132 TLX:
11529 WASHINGTON, D. C.
20008 i
SUBJECT:
THREE MILE ISLAND INCIDENT REPORT i
i THI CCLLOUING PRELI'MINARY INFORMATION IS PROVIDED ON THE THREE MILE i.
ISLAND NUCLEAR POWER PLANT INCIDENT OF k.RCH 28, 1979, FOR USE AT YOUR i
DI C"~~ TION.
2 ON APRIL 10, ALL LIGHT UATER REACTOR FACILITIES IN THE U.S. UERE PROVIDED THE FOLLOUING PRELIMINARY NOTIFICATION.
3 THE THREE MILE ISLAND NUCLEAR POUER PLANT, UNIT F, EXPERIENCED SIGNIFICANT CORE DAMAGE UHICH RESULTED FROM A IERIES OF EVENTS INITIATED BY A LOSS OF FEEDUATER TRANSIENT AND COMPOUNDED BY OPERATIONAL ERRORS.
PRESSURIIER LEVEL INDICATION APPEARS TO HAVE BEEN A CONTRIBUTING FACTOR BY
' E A."I :G TO ERRONEOUS INFERENCES OF LEVEL IN THE REACTOR COCLA17 SYSTEM.
IT HAS SEEN DETERMINED TMAT IN SOME JIITINGHOUSE-DESIGNED FA:ILITIES, COINCIDENT LOU PRESSURIIER
- ~.III J P.E { P P } AND LOU PRESSURIIER LEVEL {LP} SIGNALS ARE RECUIRED TO ACTUATE SAFETY INJECTION, AND FURTHER THAT 1
2 UNCLASSIFIED
-~
. anno rom s.
arwszo wovst leer U.S. GOVERNsC4T PRINTING CFFICE: 1974 535-402 79053 Od 3 70 [
C&A Ff.nf (41 CFR) 10,.33.304
UNCLASSIFIED l2
' PRELIMINARY ANALYSES OF % SMALL BREAK IN THE PRESSURIIER INDICATE THAT LP MAY REMAIN HIGH UHILE PP CONTINUES TO DECREASE.
IN SUCH A CASE, S AFETY INJECTION UOULD NOT AUTOMATICALLY OCCUR, AND RELIANCE BY THE OPERATOR ON LP COULD POSSIBLY LEAD TO ERRONEOUS ACTIONS.
ON APRIL 7, 1979, UESTINGHOUSE ADVISED OWNERS WITH PLANTS HAVING COINCIDENT LOGIC FOR SAFETY INJECTION SIGNALS THAT OPERATORS SHOULD MANUALLY INITIATE SAFETY INJECTION IF PP DROPS SELOU THE SAFETY INJECTION INITIATION SETPOINT.
4.
THE EXTENT TO UHICH THIS AND OTHER IMPORTANT ASPECTS OF THE THREE MILE ISLAND ACCIDENT ARE GENERICALLY APPLICABLE TO UESTINGHOUSE AND COMBUSTION ENGINEERING DESIGNED REACTORS IS STILL BEING REVIEUED, BUT IT HAS BEEN CONCLUDED THAT FURTHER ACTIONS SHOULD BE CONSIDERED ON A PRIORITY B ASIS FOR ALL LIGHT UATER POUER REACTOR FACILITIES.
MEETINGS ARE SCHEDULED TO BE HELD ON APRIL 11, 1979, UITH VENDORS TO DISCUSS THE EXTENT TO UHICH ALL ASPECTS OF THE THREE MILE ISLAND ACCIDENT HAVE GENERIC APPLICABILITY TO UESTINGHOUSE AND COMEUSTION ENGINEERING DESIGNED REACTORS 50 THAT FURTHER APPROPRIATE SHORT-TERM CORRECTIVE ACTIONS CAN BE DEVELOPED AND IMPLEMENTED.
LAFLEUR, NRC.
END 2 of 2 UNCLASSIFIED
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