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{{#Wiki_filter:+Pl'4g%t p E4 USAEC MASH US GOVERNMENT ATOMIC ENERGY COMM HDQTRS N M 9MILE OStl%710-547-0657 3"10-70'%00 PM EST k~)LRKl MF 19705(hA l0 pg g g)4O'V.S.ATOHfC EN)RGY COMM.T)YX'uillT
{{#Wiki_filter:4g%
~Yg ATTENTIONX DR PETER".p DIVISION OF REACTOR LICENSING GENTLEMEN'
+Pl '
+ffjp, 9/gN lq~SUBJECTS DOCKET NO.50"220,"P~Oi Le XDPR-17 I RADIOGRAPHY AND ULTRASONIC TESTING ON MARCH 8 1970 DISCLOSED THAT A SERIES OF CRACKS EXTENDING AROUND THE UPPER 180 DEGREES bF THE INSIDE DIAMETERS EXISTED IN THE STAINLESS STEEL SAFE-END OF THE CORE r SPRAY NOZZLE LOCATED AT AZIMUTH'40 DEGREES OF THE NINE MILE POlNT NUCLEAR STATION REACTOR VESSELS TMO VERY SMALL LEAKS MERE DETECTED SEVERAL DAYS PREVIOUS'UHICH LED TO THE APPLICATION OF NON-DESTRUCTIVE TESTING+UHEN DISCOVERED~
t p E4 USAEC MASH US GOVERNMENT k~)LRKl MF ATOMIC ENERGY COMM HDQTRS                      19705(hA l0   pg g g) 4O
THE REACTOR HAS OUT OF SERVICE IN A COLD'SHUT-DObN CONDITl ON,'I I*4I 4  
                                                        'V.S. ATOHfC EN)RGY COMM.
.-nkvd'--X'tl~.>W p~s'''''l'p c p a>.,s%tg't IT IS NECESSARY TO REHOVK THE EFFECTED NATERIAL OF THE SAFE"END FOR HETALURGICAL EXAHINATlON AS SOON AS POSSIBLKe THEREFORE'HE HATER LEVEL IN THE REACTOR VEST BE LOL'JERED TO FOUR FEET OVER THE ACTIVE FUEL+, THIS ALLOt'JS A THREE-INCH CONTROL BAND TO THE INVERT OF THE CORE SPRAY NOZZLE~TECHNICAL SPECIFICATIONS 2~1~i XW, PGe 6 DO NOT PERY)lT LOt'JKRING TO BELOW'EVEN FEET ELEVEN'INCHES OF NOld<AL LEVEL.THIS CORRESPONDS TO FOUR FKKTq EIGHT INCHES ABOVE TO TOP OF ACTIVE FUEL.%SEE BASES PG~9%+THEREFORE~
N M  9MILE OStl                                        T)YX'uillT       ~       Yg
t'JK'EQUEST A TKNPORARY CHANGE IN TECHNICAL SPECIFICATIONS TO ALLOtJ LOUERING TO FOUR FEET ABOVE ACTIVE FUEJ.t'JHICH IS ELEVATION 294 FEET.Ig ORDER TO ASSURE CO@)PLKTK SAFETY'HE FOLLOWING'TEPS UILL BK TAI<ENX" tJATKR LEVEL N, HANOHKTL'R LOOP ESTABLISHED TO OUTSIDE DRYtJKLL READABLE SEVERAL FEST ABOVE AND BKLOiJ REQUESTED LEVEL HONITORED BY OPERATOR X UI)H CONY)UNICATIONS TO CONTROL ROON., X, CLOS D CIRCUIT UNDERWATER TYPE TELEVISION, IN VESSEL AT WATERLINE MONITORED'IN CONTROL'ROOH.-743 I I.<XPOSURK 4)Z.II W  
        %710-547-0657 3"10-70 '%00        PM EST ATTENTIONX     DR     PETER       " . p 9
>>1A R'FVEL''f'1v'Fxi.'-"'u~-;II EXPOSURE OF 105 R/HR bILL EX>>IST AT VESSEL-FLANGE
DIVISION     OF REACTOR   LICENSING                         +ffjp, GENTLEMEN'                                                                      /gN lq ~
~REGULAR CONCRETE FLOOR SHIELD PLU'GS bILL BE.REINSTALLED ABOVE VESSEL ATTENUAT'INC'IELD TO FsZLOt'00 NR/HR~THE FLOOR.AREA.[~JILL BE DECLARED A HIGH-,tADIATIGN ARFA-ANB ACCESS RESTRICTED.
SUBJECTS       DOCKET NO. 50"220, "P ~ Oi Le XDPR- 17 I
'XPOSURE LEVELS i')ILL BE 1 t'MONITORED AS'EVEL IS SLO'>>'EELY LOUERED IN VESSEL~EnPQSU2Z IN THF UORK AREAR'RESENTLY AT 27 NR/HR GN COt<'i ACT Vi LL B~i AI~:T,>I"ZB AS LOU.AS PR>>ACTICAL
RADIOGRAPHY AND ULTRASONIC TESTING ON MARCH 8                 1970 DISCLOSED THAT A SERIES OF CRACKS EXTENDING AROUND THE UPPER 180 DEGREES bF THE INSIDE DIAMETERS EXISTED IN THE STAINLESS STEEL SAFE-END                 OF THE CORE r
<iITH LEAD SHEET SHIELDING INSIDE THE VESSE1.III'ONTROL GF LEVEL LGl" INTO THE VESS L FRGH THE CONT OL ROD DRIVE SY$TEii IS ABOUT 65.GPY~BR>>AII~AGE TO HGLB LEVEL IS AT PRESENT AND WILL BE iiAINTAINED THROUGH R>>EtlOTELY OPERATED" VALVES BET>iEEg THE CLEAN-UP SYSTEti AND ZITHLP CGtJDEiv'SER OR EQUIPhEHT BRAIN TAN<<~OPERATION IS FRGY>THE CONTROL R>>00tl~ONE OF THREE CONDENSATE PUHPS GILL BF, IN" CONTINUOUS OPERATION UHEREBY CONDENSATi".
SPRAY NOZZLE LOCATED AT         AZIMUTH'40 DEGREES       OF THE NINE   MILE POlNT NUCLEAR STATION REACTOR VESSELS           TMO VERY SMALL LEAKS MERE DETECTED SEVERAL DAYS PREVIOUS 'UHICH LED TO THE APPLICATION OF NON-DESTRUCTIVE TESTING+     UHEN DISCOVERED~ THE REACTOR HAS OUT OF SERVICE               IN A COLD
CA'N BE ADDED TO THE VESSEL BY REhOTE FEED>>~ATER VALVE OPERATION FROM THE CONTROL ROOtio IV+HEAT RLYiGVAL REGULAR hEAT REtiGVAL SYSTEYiSp REACTOR CLEAN"UP ANB/OR SHUT-D04N COOLING<lILL BE AVAILABLE AND IN SERVICE IN THEIR tqGRl>>iAL-OPZRATIivG iiIOBZS.
                                                                              'I
I h(ll C U f't I 1  
        'SHUT-DObN CONDITl ON,
-UPON CONPLETION OF PIPE CUTTING OPERATIONS AN EXPANDABLE PIPE PLUG HILL,BE INSERTED IN TPE NOZZLE AND RE1NFORCED
 
<~JITH JACK SCREl>S FROH THE OU7SIDE iN ORDER TO PREVENT THE PLUG FROID BEING BLOt'JN OUTo 4ATLR LEVEL UILL THEN BE RETURNED TO A POiNT NEAR THE FLANGE READABLE I OiN CLOSED CIRCUIT'ELEVISION AS AT PRESENTo LEVEL hAY BE INCREASE'D TO REFUELING LEVEL SHOULD INVESTIGATIONS SH04'NEED.FOR CORE UNLOADING~RESULTS Oi'HETALUR'GICAL, EXAMINATION UILL DETERt'1INE METHOD OF REPAIRp.BUT IN NO EVENT KILL REACTOR BE.OPERATED UITHOUT PRIOR NOTICE OF U o So'TOl'1IC ENERG7 COHYiiSSIONo
I* 4I 4 IT IS
//INVESTIGATION OF ALL OTHER SAFEENDS ON VESSEL ARE PROCEEDING bITH P~To p UoTo p AND R~To HETHODS~P.~A~BUiRT STATION SUPERINTENDENT N I~i 9NILE OSLJ u1 l o vl~at<v s"QQG3 p.",:,-'.,:'Q>V'8".
            .-nkvd'-- X'tl~.>W
eg a e i>uvAOE6~T N01103S 3',l",'i."..S
                            ~             s' '' '   'l'p c p a >.,s%tg   't           p NECESSARY TO REHOVK THE EFFECTED NATERIAL OF THE SAFE"END FOR HETALURGICAL EXAHINATlON AS SOON AS POSSIBLKe                         THEREFORE'HE HATER LEVEL IN THE REACTOR VEST BE LOL'JERED TO FOUR FEET OVER THE ACTIVE FUEL+, THIS ALLOt'JS           A THREE-INCH CONTROL BAND TO THE INVERT OF THE CORE SPRAY NOZZLE ~             TECHNICAL SPECIFICATIONS 2 ~           1 ~ i XW, PGe 6 DO NOT PERY)lT LOt'JKRING TO BELOW'EVEN FEET               ELEVEN 'INCHES OF NOld<AL LEVEL.
'11VN SU3lHVAAV~H p%p al''~r}}
THIS     CORRESPONDS         TO FOUR FKKTq EIGHT INCHES ABOVE TO TOP OF ACTIVE FUEL.     %SEE   BASES PG ~ 9%+
THEREFORE~       t'JK'EQUEST       A TKNPORARY CHANGE     IN TECHNICAL SPECIFICATIONS TO ALLOtJ LOUERING TO FOUR FEET ABOVE ACTIVE FUEJ. t'JHICH                       IS ELEVATION 294 FEET.       Ig   ORDER TO ASSURE CO@)PLKTK     SAFETY'HE FOLLOWING'TEPS UILL     BK TAI<ENX
    "
tJATKR LEVEL N,     HANOHKTL'R LOOP ESTABLISHED TO OUTSIDE DRYtJKLL READABLE SEVERAL FEST ABOVE AND BKLOiJ REQUESTED LEVEL                   HONITORED BY OPERATOR X   UI)H CONY)UNICATIONS TO CONTROL ROON.,
X,     CLOS D CIRCUIT UNDERWATER TYPE           TELEVISION,IN VESSEL               AT WATERLINE MONITORED     'IN     CONTROL 'ROOH.-
743 I I.   <XPOSURK
 
4   )
Z.
II W
 
            >>1A   R'FVEL' 'f '1v'       Fxi.'-"'u ~-;
II EXPOSURE OF 105 R/HR         bILL     EX>>IST AT VESSEL-FLANGE ~   REGULAR CONCRETE FLOOR SHIELD PLU'GS       bILL   BE .REINSTALLED ABOVE VESSEL       ATTENUAT'INC'IELD TO FsZLOt'00 NR/HR ~         THE FLOOR. AREA.[~JILL BE DECLARED A HIGH-
    ,tADIATIGN ARFA       -ANB ACCESS     RESTRICTED. 'XPOSURE LEVELS i')ILL BE 1
SLO'>>'EELY t'MONITORED AS     'EVEL IS               LOUERED   IN VESSEL ~
AREAR'RESENTLY EnPQSU2Z IN       THF UORK                         AT 27 NR/HR GN COt<'i ACT                 ViLL  B~
i AI~:T,>I"ZB AS LOU.AS PR>>ACTICAL <iITH LEAD SHEET SHIELDING                               INSIDE THE VESSE1.
III'ONTROL           GF LEVEL LGl" INTO THE VESS L FRGH THE CONT OL ROD DRIVE SY$ TEii                   IS ABOUT 65.
GPY ~   BR>>AII~AGE TO HGLB LEVEL       IS AT PRESENT AND WILL BE iiAINTAINED THROUGH R>>EtlOTELY OPERATED" VALVES BET>iEEg THE CLEAN-UP SYSTEti AND ZITHLP     CGtJDEiv'SER OR EQUIPhEHT BRAIN       TAN<< ~ OPERATION                   IS FRGY> THE CONTROL R>>00tl ~     ONE OF THREE CONDENSATE PUHPS       GILL BF,                 IN" CONTINUOUS OPERATION UHEREBY CONDENSATi". CA'N BE ADDED TO THE VESSEL BY REhOTE FEED>>~ATER VALVE OPERATION FROM THE CONTROL ROOtio IV+     HEAT RLYiGVAL REGULAR hEAT REtiGVAL SYSTEYiSp REACTOR CLEAN"UP ANB/OR SHUT-D04N COOLING <lILL BE AVAILABLE AND IN SERVICE IN THEIR tqGRl>>iAL- OPZRATIivG iiIOBZS.
 
I h(
ll C
U f
't I
1
 
-
UPON CONPLETION OF             PIPE CUTTING OPERATIONS     AN EXPANDABLE   PIPE PLUG HILL,BE INSERTED IN TPE NOZZLE                 AND RE1NFORCED <~JITH JACK SCREl>S FROH THE OU7SIDE           iN   ORDER TO PREVENT THE PLUG FROID BEING BLOt'JN OUTo 4ATLR LEVEL UILL THEN BE RETURNED TO                 A POiNT NEAR THE FLANGE READABLE I
OiN     CLOSED   CIRCUIT'ELEVISION         AS AT PRESENTo   LEVEL hAY BE INCREASE'D TO REFUELING LEVEL SHOULD INVESTIGATIONS SH04 'NEED. FOR CORE UNLOADING~
RESULTS Oi'HETALUR'GICAL,EXAMINATION UILL DETERt'1INE METHOD OF REPAIRp
  .BUT       IN NO EVENT     KILL REACTOR     BE. OPERATED UITHOUT PRIOR NOTICE OF U o     So'TOl'1IC     ENERG7 COHYiiSSIONo                     /
/
INVESTIGATION OF ALL OTHER SAFEENDS                 ON VESSEL ARE PROCEEDING bITH P ~ To   p UoTo p AND R ~ To HETHODS ~
P. ~     A~ BUiRT STATION SUPERINTENDENT N   I~i 9NILE   OSLJ
 
u1 l     o vl at<v
                ~      s "QQG3 p.",:, -'.,:'Q>V'8".
eg a   e T i> uvAOE6~
N01103S 3',l",'i."..S '11VN SU3lHVAAV~H al ''~r p %p}}

Revision as of 08:09, 30 October 2019

Letter Reporting an Incident, During Radiography and Ultrasonic Testing, That Disclosed a Series of Cracks Extending Around the Upper 180 Degrees of the Inside Diameter, Exist in the Stainless Steel Safe-End of the Core Spray..
ML17037C142
Person / Time
Site: Nine Mile Point Constellation icon.png
Issue date: 03/10/1970
From: Burt P
Niagara Mohawk Power Corp
To: Morris P
US Atomic Energy Commission (AEC)
References
Download: ML17037C142 (8)
v • d • e


Text

4g%

+Pl '

t p E4 USAEC MASH US GOVERNMENT k~)LRKl MF ATOMIC ENERGY COMM HDQTRS 19705(hA l0 pg g g) 4O

'V.S. ATOHfC EN)RGY COMM.

N M 9MILE OStl T)YX'uillT ~ Yg

%710-547-0657 3"10-70 '%00 PM EST ATTENTIONX DR PETER " . p 9

DIVISION OF REACTOR LICENSING +ffjp, GENTLEMEN' /gN lq ~

SUBJECTS DOCKET NO. 50"220, "P ~ Oi Le XDPR- 17 I

RADIOGRAPHY AND ULTRASONIC TESTING ON MARCH 8 1970 DISCLOSED THAT A SERIES OF CRACKS EXTENDING AROUND THE UPPER 180 DEGREES bF THE INSIDE DIAMETERS EXISTED IN THE STAINLESS STEEL SAFE-END OF THE CORE r

SPRAY NOZZLE LOCATED AT AZIMUTH'40 DEGREES OF THE NINE MILE POlNT NUCLEAR STATION REACTOR VESSELS TMO VERY SMALL LEAKS MERE DETECTED SEVERAL DAYS PREVIOUS 'UHICH LED TO THE APPLICATION OF NON-DESTRUCTIVE TESTING+ UHEN DISCOVERED~ THE REACTOR HAS OUT OF SERVICE IN A COLD

'I

'SHUT-DObN CONDITl ON,

I* 4I 4 IT IS

.-nkvd'-- X'tl~.>W

~ s' ' 'l'p c p a >.,s%tg 't p NECESSARY TO REHOVK THE EFFECTED NATERIAL OF THE SAFE"END FOR HETALURGICAL EXAHINATlON AS SOON AS POSSIBLKe THEREFORE'HE HATER LEVEL IN THE REACTOR VEST BE LOL'JERED TO FOUR FEET OVER THE ACTIVE FUEL+, THIS ALLOt'JS A THREE-INCH CONTROL BAND TO THE INVERT OF THE CORE SPRAY NOZZLE ~ TECHNICAL SPECIFICATIONS 2 ~ 1 ~ i XW, PGe 6 DO NOT PERY)lT LOt'JKRING TO BELOW'EVEN FEET ELEVEN 'INCHES OF NOld<AL LEVEL.

THIS CORRESPONDS TO FOUR FKKTq EIGHT INCHES ABOVE TO TOP OF ACTIVE FUEL. %SEE BASES PG ~ 9%+

THEREFORE~ t'JK'EQUEST A TKNPORARY CHANGE IN TECHNICAL SPECIFICATIONS TO ALLOtJ LOUERING TO FOUR FEET ABOVE ACTIVE FUEJ. t'JHICH IS ELEVATION 294 FEET. Ig ORDER TO ASSURE CO@)PLKTK SAFETY'HE FOLLOWING'TEPS UILL BK TAI<ENX

"

tJATKR LEVEL N, HANOHKTL'R LOOP ESTABLISHED TO OUTSIDE DRYtJKLL READABLE SEVERAL FEST ABOVE AND BKLOiJ REQUESTED LEVEL HONITORED BY OPERATOR X UI)H CONY)UNICATIONS TO CONTROL ROON.,

X, CLOS D CIRCUIT UNDERWATER TYPE TELEVISION,IN VESSEL AT WATERLINE MONITORED 'IN CONTROL 'ROOH.-

743 I I. <XPOSURK

4 )

Z.

II W

>>1A R'FVEL' 'f '1v' Fxi.'-"'u ~-;

II EXPOSURE OF 105 R/HR bILL EX>>IST AT VESSEL-FLANGE ~ REGULAR CONCRETE FLOOR SHIELD PLU'GS bILL BE .REINSTALLED ABOVE VESSEL ATTENUAT'INC'IELD TO FsZLOt'00 NR/HR ~ THE FLOOR. AREA.[~JILL BE DECLARED A HIGH-

,tADIATIGN ARFA -ANB ACCESS RESTRICTED. 'XPOSURE LEVELS i')ILL BE 1

SLO'>>'EELY t'MONITORED AS 'EVEL IS LOUERED IN VESSEL ~

AREAR'RESENTLY EnPQSU2Z IN THF UORK AT 27 NR/HR GN COt<'i ACT ViLL B~

i AI~:T,>I"ZB AS LOU.AS PR>>ACTICAL <iITH LEAD SHEET SHIELDING INSIDE THE VESSE1.

III'ONTROL GF LEVEL LGl" INTO THE VESS L FRGH THE CONT OL ROD DRIVE SY$ TEii IS ABOUT 65.

GPY ~ BR>>AII~AGE TO HGLB LEVEL IS AT PRESENT AND WILL BE iiAINTAINED THROUGH R>>EtlOTELY OPERATED" VALVES BET>iEEg THE CLEAN-UP SYSTEti AND ZITHLP CGtJDEiv'SER OR EQUIPhEHT BRAIN TAN<< ~ OPERATION IS FRGY> THE CONTROL R>>00tl ~ ONE OF THREE CONDENSATE PUHPS GILL BF, IN" CONTINUOUS OPERATION UHEREBY CONDENSATi". CA'N BE ADDED TO THE VESSEL BY REhOTE FEED>>~ATER VALVE OPERATION FROM THE CONTROL ROOtio IV+ HEAT RLYiGVAL REGULAR hEAT REtiGVAL SYSTEYiSp REACTOR CLEAN"UP ANB/OR SHUT-D04N COOLING <lILL BE AVAILABLE AND IN SERVICE IN THEIR tqGRl>>iAL- OPZRATIivG iiIOBZS.

I h(

ll C

U f

't I

1

-

UPON CONPLETION OF PIPE CUTTING OPERATIONS AN EXPANDABLE PIPE PLUG HILL,BE INSERTED IN TPE NOZZLE AND RE1NFORCED <~JITH JACK SCREl>S FROH THE OU7SIDE iN ORDER TO PREVENT THE PLUG FROID BEING BLOt'JN OUTo 4ATLR LEVEL UILL THEN BE RETURNED TO A POiNT NEAR THE FLANGE READABLE I

OiN CLOSED CIRCUIT'ELEVISION AS AT PRESENTo LEVEL hAY BE INCREASE'D TO REFUELING LEVEL SHOULD INVESTIGATIONS SH04 'NEED. FOR CORE UNLOADING~

RESULTS Oi'HETALUR'GICAL,EXAMINATION UILL DETERt'1INE METHOD OF REPAIRp

.BUT IN NO EVENT KILL REACTOR BE. OPERATED UITHOUT PRIOR NOTICE OF U o So'TOl'1IC ENERG7 COHYiiSSIONo /

/

INVESTIGATION OF ALL OTHER SAFEENDS ON VESSEL ARE PROCEEDING bITH P ~ To p UoTo p AND R ~ To HETHODS ~

P. ~ A~ BUiRT STATION SUPERINTENDENT N I~i 9NILE OSLJ

u1 l o vl at<v

~ s "QQG3 p.",:, -'.,:'Q>V'8".

eg a e T i> uvAOE6~

N01103S 3',l",'i."..S '11VN SU3lHVAAV~H al ~r p %p

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