ML20052F787
| ML20052F787 | |
| Person / Time | |
|---|---|
| Site: | 05000000, 05000465 |
| Issue date: | 03/09/1982 |
| From: | Mandeus G SWEDEN, GOVT. OF |
| To: | NRC OFFICE OF INTERNATIONAL PROGRAMS (OIP) |
| Shared Package | |
| ML20049H209 | List: |
| References | |
| FOIA-82-167 NUDOCS 8205130636 | |
| Download: ML20052F787 (3) | |
Text
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MAR 9 1982 S
l ATTENTION: JOEPEH D. LATLEUR, uRC
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OFFICE OF INTERNATIONAL PROGRAMS I
i RE: APPLICATION FOR STARTING RINGHALE 3 THE STATE POWEE BOARD (SSPS) HAS !!CV EADE AN APPLICATION FOR STARTING I;P RIEGRALS 3 THE FOLLOVING TO BE READ IS A CONCENTRATE OF THE STATEMENT IiY SSPB THE INTENTION IS TO OPERATE THE REACTOR AT 42 O/O OF ITE
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POWER DURING iScc H FOLLOWED BY AN EDDY CURRENT EXAMINATION j'
i OF THE STEAM GENERATORS THE OPERATING PROGRAM ALSO INCLUDES 1
SHORTER PERIODS AT LOVER AS WELL AS AT MIGHER FOWER LEVELS.
THIS IS IN OP. DER TO GET INCREASED FACTS ON THE VIBRATIONS OF THE STEAM GENERATORS". THE TOTAL CPERATING TIF.E WITH 1
1' F. ORE TMAN AB O/O FCVER WILL EDVEVER NOT EXCEED 78 H BEFORE AN INSPECTION BY EC-IXAh1 NATION. EASED ON THE FACTS OF THIS EXAn t t:AT I ON, DECISIONS WILL EE MADE CONCERNING THE LENGTH AND THE F OVuh CF THE FOLLOVING GFEEATING FR3GRAt.
AN EARLY HYFOTHESIS VAS THAT THE V1BRATIONS WERE CAUSED ONLY BY SO CALLED
- FLUID ELASTIC VIBRATIONS *. ANALYSIS AND EXP rJtI MENT S, NOW MADE, INDICATES THAT THE RZASON FOR '
THE V1 BRAT!DNS IN THE TUBES ARE A COMBINATION OF DIFFERENT
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FLOW PHENOMENA IN THE PRIMEATER SECTION.
8205130636 820416 PDR FOIA UDELL82-167 PDR THE DAMAGES ON THE TUBES OF THE STEAM OENERATORS OF RINGHALS 3 ARE CONSISTENT TO THE RESULTS OF THE FLOW VELOCITY MEASUMEMENTS DURING TME TEST AT AELVKARLEBY.
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.ACCORDING To SSPB, THE TUBES ARE REQUIRED TO HAVE A MINIMUM THICMNESS OF 35 O/O OF THE NOMINAL ONE IN ORDER 70 VITHSTAND AN ACCIDENT WITHOUT SUFFERING TUBE BREAK.
THESE VALUES ARE ACCORDING TO REGULATORY GU*DE J.121.
TO THE MINIMUM 35 0/0, SSPE MAS ADDED 18 O/O FOR l
CONTINUED VEAR, IF ANY, AND ON TOF Dr THIS S e/c AS AN EXTRA SATETY MARGIN. THUS TUEES SHOVING A VEAR OF MORE THAN 58 O/0 VILL BE PLUGGED. TKts VILL MINIM 2ZE THE RI SK T HAT BREAEAGE OR LEAKAGE OT THE TUBES SHOULD BE EITHER A CONTRIBUTORY CAUSE TO OR KAKE WORSE A l
POTERTIAL UKCIDENT, AS THE ESTIMATED WEAR IS S O/0 t
A._ND.THE LEEVAY 15 15 O/O.
IN ORDER TO DETECT IT ANT OF THE PLUGGED TUBES, IN SFJTE I
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OF THIS, WILL BE WORN THROUGH, THE 3 MOST WORN TUBES IN l
EACM STEAM GENERATOR VILL BE FITTED WITH LEAHING PLUGS.
BETORE THE OPERATING PROGRAM DESCRIBED ABOVE I S ST ARTED, AN EC EXAMINATION WILL BE MADE ON A NUMBER OF TUSES IN f.
ORDER TO FINALLY DECIDE WHICH TVBES ARE TO BE PLUGGED.
IN ORDER TO MEASURE VI BRATJ ONS, STEAM GENERATOR I WILL SE ECUIPPED WITH SPECIAL INSTRUMENTSe TO MAHE IT POSSIBLE TO TOLLOW AND TO REGISTER THE Ff BRA TI ONS.
SSFB EST I MATES, THAT A FINAL SOLUTION TO THE SG PROBLEKS I
CA!!NOT BE IMPLEMENTED DURING 1962.
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ACCORDING TO SSPD, THE OPERATICN SUGGESTED WILL NOT INCREASE RADIATION DURING THE PERIOD 1982-1983 BY MORE THAN A TACTOR 2.E COMPARED TO OCT-NOV 1981.
ACDITIONAL TRAINING WILL BE GIVEN TO THE OPERATING FERSONNEL, BEFORE Al.*Y OPERATION IS STARTED AGAIN.
S KI VILL NOW REVIiV THIS APPLICATION AND IF NOTHING l
UNEXPECTED WILL OCCUR SSPB WILL PROBABLY GET PERMISSON TO START FFROM SMI AT THE END OF WE.EK 11.
WE WILL KEEP YOU INFORMED ABOUT OUR FUTURE DECISIONS l
AND ABOURT OTHER THINGS, THAT COULD BE OF INTEREST TO YOU.
YOURS SINCERELY, GORAN MANDEUS e
SWED4SH NUCLA I
SVEDISH NUCLEAR POWER IESPECTORATE"""
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