ML20090D336

Ro:On 730829,fuel Bundle Segments Found Operating Slightly in Excess of Allowable Average Planar Linear Heat Generation Rate.Core Thermal Power Reduced Using Reactor Recirculation Flow

ML20090D336
Person / Time
Site:	Nine Mile Point
Issue date:	08/30/1973
From:	Perkins T NIAGARA MOHAWK POWER CORP.
To:	James O'Reilly US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20090D333	List: ML20090D332 ML20090D336
References
RO-730830, NUDOCS 8302280017
Download: ML20090D336 (2)

Text

- _ _ _ _ _ _ _ _ _ _

ly- 9 9 O TO: ItR. JNIES P. O'REILLY flIflE HILE POIllT liUCLEAR STATION FR0th HR. Tit 0(MS J. PERKif4$ , DOCKET l10. 50 220 On or about 1600 hours0.0185 days <br />0.444 hours <br />0.00265 weeks <br />6.088e-4 months <br /> August 29, 1973 following a routine calibration of the Local- Power Range lionitors (LPRfi) and subsequent core power distribution calculation fuel bundle seguent.s were found to be operating slightly in excess of the allowable average planar LilGR as shotm in Figure 3.1.7 The Fuel Bundles irr question were reload 1 type. The maxinw average planar LHGR was found to be approximately 10.75 13(/FT. For this fuel type and nodal exposure of approximately 1930 MWD /ST the Ifmit shown on figure 3.1.7 is approxinutely 10.6 KW/FT. Itamediately steps were taken to reduce the maximum average planar LHGHR by reducing Core Themal Power using Reactor Pecirculation.

Flow. Subsequent core power' distributions calculations showed all fuel types to be operating within the limits showit on Figure 3.1.7.

In order to mintain the Core Power Distribution input data (LPRft) reliability at a high level the frequency of LPPJi calibrations will be increased from the nominal full power nonth frequency to every full power two week period.

In addition, steps will be taken to alter the existing rod pattern to acheive a flatter power distribution which will improve the margin between operating levels and lirnits.

8302280017 730907 S

PDR ADOCK 05000220 pop

10 (Hanse end onet) 08s4 TIALS REMAA8LS .

i e

,f

+

Licensee: Niagara Mohy k Power Corp.

1 s .

L + H. D., Thornburg, oAtt Docket No.: 50-220 .

Chief, FS&EB '

Abnormal Occurrence: Facsimile Message re eibed

) O/JU//J - UOre power ulStrl-i To (Nem. and onst) 8MITIALs RLM AA sLS

. ,, bution fuel bundle segments found RO: LIQ (5) vue1. nim iu u.w e s s or 1.s.

DR Central Files (1) oArE The attached report from the subject licensee is Regulatory Standards 3)

Dir. of Licensing (13?

forwarded in accordance with RO Manual Chaoter 1000.

i= Ai.s nMAAxs RO Files y t o tu. . .no .

Central fla'il & Files The action taken by the licensee is' considered at appropriate. Followup will be performed during O

l raou m.m. .no unio n=Rxs i p' ,

the report have been forwarded to the PDR, Local

3. u~ . '

R.'T. Carlson, Chief PDR, NSIC, DTIE and State representatives. The t , Facility Operations Branch licensee will submit a 10 day written report to PHONEIG DATE *

• 8/30/73 Licensing.

USE OTMA $4DE FOR ADDITIONAL ALMARKs . CPO: 1978 O. 40 e

. . . , . . - 4, .s..,...._. . --.

r .

, .y. .1 :

.r. v. . . .

. ,c . . . . ~- . . ..'* l.e GW.. :. ..,. .. p. .W - ' .

.n.,. .

. ' . .v..  :., G..

. ; : a: -

, y, m. .

.:.. :~. p .  ;-

....>.? "' .

d -?p%.;.C

~

y.s; W%.*:- . ,' .. ; 3. 5' .>

~

.. . . ~ 'f '.

.N.-f,x*.. . . .. .

,.

t ,. *, 3 ,.

- - .+- t . L p;, _

% *--4. . . .,

~

3..  %, %;r. ,*::r.. - . u.. .! *.k.:. * .:' '. ,,,

g.Q ..'~-

. . r. . .

+ . . . . .., f . .f... ,. . --

..*. .;* . g.

..:.'.e ,E .:**;- is .*

..;fr*( , _ ;*.' .

i?A.*.n. ;: .- ,

.*? f.l%.s.

. .1, - , , .

.. tg: .

y ..b..>..~

. :y? .5. . .

<.g!: - .

.i, . . :~ c.xp- - . a v

. -ye. .- *

.-c

. > .. ':. s . . . n .4 .'.':

.....v

~'

1..

4. . ., . = .

. . e ... , ~!... e - a' -

q:@. .'

• r .

':. . .J *.O./ >

... h, ;,. s.; .

c . .3*.4 ..!,,; .:.. '*\*. * 'y' ' .;*

e. ./ 6%y, s ..x 1 : * -

, . 3. ,

. f,-u f,' . .,

, r. p.[ . ?: . *

,a . l

• f fl :. ,h.=.s  :,,l;3 *. Y,-

• .,f* '

.J .

x- , . .'] **

.we . _ ..,

~j,j'

,,y,.

l. ':f:! . ,

g f,.e . ,

• .. ,"*s'

, .X .

s . ~ : 3. *. - .

Q .g. . ,.

, ) .

• Y!

• , , **J* *

• {,* f ' r .

. . . ,.:-a - . . .  : :c:, .

~7. g.

• • g ,. V f,*

• y .'g.. - '

' ~

• . _. : .r. . .; L./ . ..

X i .. l, :g. "'*~

J.; a -

, ;: >. -s . . .

1 s, .

.. s .3 s.. .,. sr. .

. .q . . . ,.s'

• 1 A ..

.r. .

.. .  : .r .

r

.n n-

~

4. R <f. y ,

C. * * * ,

. '.I@ i.. .

,e '

. r*; . ..

.n. ,* .s.,,..,.

v.

..l%

4,._.

. r ,y ' ,

,  ;.y

• t . ;Q*r.; , * . . : g.w - y *.~ ' .

.* .... , s ' *y: *

,.r,., , *,1 ~

a f,- Tr ,.

.* .I . ,.f..

• ' I k* *, *

. f... .

~.

o g .

.. s y . .

. . . , _ . _ _ . - . -