ML20127P254
| ML20127P254 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 07/21/1975 |
| From: | Mayer L NORTHERN STATES POWER CO. |
| To: | Anthony Giambusso Office of Nuclear Reactor Regulation |
| References | |
| LER-LER-750721, NUDOCS 9212020170 | |
| Download: ML20127P254 (2) | |
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NORTHERH STATE 5 POWER COMPANY MIN N E A PO LI S. MIN N E S OTA 95401 bl 1.
July 21, 1975 Regulatory Dcchet Fila
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Mr A Gia:nbusso, Director D
Division of Reactor Licensing U S Nuclear Regulatory Commission Washington, DC 20555
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Dear Mr Giambusso:
HONTICELLO NUCIIAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 Licensee Event Report to the NRC Observed Cracks in Failed Fuel Assemblies The Licensee Event Report for this occurrence is reproduced on the back of this letter.
Yours very truly, h,
Y L 0 Mayer, PE Manager of Nuclear Support Services 91 1 %'
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4 7321 9212O20170 720721 PDR ADOCK 05000263
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(ptgAst PRINT Att RfeUinED INFORMAT>ON) 1 6
NAME LCENsn NuvetR E
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$8 59 60 61 68 69 74 75 80 EVENT DESCR:PTION gg l On July 11, 1975, Region III NRC I&E requested that the visible cracks observed j
7 89 80
@l in several corner pins of ten initial core 7x7 fuel assemblies be reported as an l
7 89 80
@ [ AO.
Assemblies are leakers removed from core after cycles 2 and 3.
Leaks have l
7 89 80 Ql been identified in 158 of 484 initial core assemblies to date.
No leaks have l
7 e9 80 g[ been identified in 7x7 or 8x8 reload fuel. We plan to replace remaining initial l
7 89 m,q 80 cost surNn MIENuNu DE coupoNENT coot viotAfoN
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[NJ 7 89 to 11 12 17 43 44 47 48 CAUSE DESCRIPT:ON
( Fuel pin f ailures believed Caused by hydride and pellet-Clad interat tion l
28 7 89 80 EE l mechanisms.
Leaking fuel has been identified and replaced each refueling outage. l 7 89 80 8l l
stAIus' s powin OTuta STAfus oscovtav orscovtav OtscnietoN (E_j l0 l8 l 3 l lNA l d l TV Camera Inspection l
7 8 9
10 12 13 44 45 46 80 HEtt SED OF Att St AMOUNT of ACTMTV tocatioN OF REif ASE IO l__Zj d
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10 11 44 45 80 PERSONNEL EXPOSunES NUMBE R t v Pt DISCRIPfiCN 8 l_01 0101 La_] I NA l
7 89 11 12 13 80 PERSONNEL INJURIES E -l 0l l0l l l
7 89 11 12 80 OFFSITE CONSEQUENCES Eg l NA l
7 89 80 LOSS OR DAM AGE TO FAClllTY typt otscnieticN
@ [L,j l Reactor power reduced to decrease activity release.
l 7 89 10 BV PUBLICITY DE I NA l
7 39 80 ADDITIONAL FACTORS l Event Description (contd.)
core 7x7 fuel during refuel outage scheduled to l
18 7 89 80 DE l begin in September, 1975.
(A0 50-263/75-11) 1 7 89 80 NAME M H Clerftv 612/295-5151 PHONE:
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