ML20203Q237

Special Rept 86-02:on 860415,positive Moderator Temp Coefficient 0.01 Pcm/F Measured.Withdrawal Limits Established to Ensure Negative Moderator Temp Coefficient Maintained Per Encl Figure 2-13

ML20203Q237
Person / Time
Site:	Callaway
Issue date:	04/17/1986
From:	Randolph G UNION ELECTRIC CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
86-02, 86-2, ULNRC-1299, NUDOCS 8605090148
Download: ML20203Q237 (2)

Text

'

Eg .47/M

{ T l i T p1

. _~_ l UNION ELECTRIC COMPANY -

ULNRC-1299, Conomy Plant P d ~ ~

~

t~

April 17, 1986 t diYW Mr. James G. Keppler Regional Administrator .e@png Office of Inspection & Enforcement U.S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT I FACILITY OPERATING LICENSE NPF-25 CALLAWAY PLANT POSITIVE MODERATOR TEMPERATURE COEFFICIENT SPECIAL REPORT 86-02

Dear Mr. Keppler:

This report is submitted pursuant to the requirements of Callaway Technical Specification 3.1.1.3.a.

On April 15, 1986 during the conduct of initial Low Power Physics Tests, a positive moderator temperature coefficient of 0.01 pcm/*F was measured per procedure ESP-ZZ-00009, Moderator Temperature Coef ficient Measurement at Zero Power. Low power physics testing continued sub-sequent to this measurement in accordance with Special Physics Test Exception Specification 3.10.3. Following measurement of isoth'rmal temperature coefficient with Bank D inserted and with Banks D and C inserted, and measurement of bank worths for Control Banks C and D, interim bank withdrawal limits have been determined. These withdrawal limits have been conservatively established to ensure a Moderator Temp-erature Coef ficient of - 1 pcm/*F is maintained. These limits are provided as Attachment 1 to this report. The burnup necessary to re-store a negative Moderator Temperature Coefficient under the most limiting plant conditions (Hot Zero Power, All Rods Out, No Xenon) has been calculated to be 4000 MWD /MTU. This core average burnup carresponds to a Boron Concentration of 1430 pps at the conditions stated and has been calculated to yield a Moderator Temperature Coefficient of - 1 pcm/*F.

The rod withdrawal limits included as Attachment I will be imposed until a core burnup of 4000 MWD /MTU has been achieved.

8605090148 860417 PDR ADOCK 05000483 S PDR &

G. L. Randolph Manager, Callaway Plant GLR /WRC/KDA/KRB/ crc g Attachment gI cc: USNRC Resident Inspector, Callaway USNRC Licensing Proj ect Manager Executive Director, SNUPPS Manager, Electric Department, J (h g\

M u ic vice Commission Maihng Address: PO. Box 620 Futton, MO 65251 APR 2 81986

. FIGURE 2-13 ETP-ZZ-00014 CONTROL R0D WITHDRAWAL LIMITS TO MAINIAIN MIC < 0 EFFECTIVE UP TO 4000 MWD /M U BURNUP, CYCLE 2 I i s r i

i ,

a >

! I g

! N N ~S a

a 8

, w z h I i N h

g m

z o

= - -  %

o o i #  !

MW -

i -

A M ' ~# 1

o 3

! i e I .

,c L

M" 100%  ! {

~ ~

1. .5

1. t Y -

C La s

/ - ,o

• 90 . - ,

f a {

s N ,

g

1. C 6

80% .y r

1 i

,o 0

} ,

1. 1 s w t

/

t #

s r ,

70% - #

s .o

/

e _o 60% /

e A s

./

V #

/

/

' 50% -- . - . ' ' -8 f

/

1

.- - / -

8

/ a 40% - f f ,

h t _

O

' ;8 -

/-

7- -

' ~

' e 30% - - . / 3 Z

1. # ' W

1. ~ # g

! ' ' ' z 20% -

o f f a u o

~

~

t #F #

1. _# m z f f o 10% i g

^

s I #

HZP -

I i

z O W o J O 4

', cQ N d i 4 O 3 W O M I J

+

J N  !

{  ;

- i  ; l I l m m e m m e m U N N N N m m .-e m

N N m m

% N N q Q N O c N as N N m m