ML19345A492
| ML19345A492 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 05/16/1972 |
| From: | Vandenburgh D YANKEE ATOMIC ELECTRIC CO. |
| To: | US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8011210748 | |
| Download: ML19345A492 (6) | |
Text
Proposed Change No. 100
~
segut; tory F,1Ie YANKEE ATOMIC ELECTRIC COMPANY h
.YK 20 TURNPIKE ROAD, WESTBORO, MASSACHUSETTS 01581 TELEPHONE 617 366 9011 O
USAEC May 16, 1972 5
MAY 171972
- f3
~
REGULATORY )
9:1 MAIL SECT 10
<;t DOCKET CLER!(
M q,
/g g\\
J
%9 y
g h1
.-3 ed States Atomic Energy Commission Washington, D. C.
20545 I
If"4
~~
6-0
~
/y p-
~
Attention: Division of Reactor Licensing
).,
O 8
Reference:
License No. DPR-3 (Docket No. 50-29) fN O
Dear Sirs:
Pursuant to Section 50-59 of the Commission's Regulations, l
Yankee Atomic Electric Company hereby requests authorization to make j
the following change:
a l
PROPOSED CHANGE: Reference is made to Section 400 of the license applica-i tion, Safety Analysis, particularly Page 400:2 and to Paragraph D.2.d of l
the Technical Specifications attached as Appendix A to the license and as
{
amended in Proposed Change No. 99.
We propose the following:
" Operation of the Yankee reactor at reduced output, increased surveillance and operating restrictions, a higher main coolant boron concentration, reduced main coolant average temperature l
and 23 of the 24 control rods capable of dropping in less than 2.4 seconds."
l}
Reason for Change: During the control rod exercise and drcp the testing program, difficulty was encountered with control rco Jo, 18, L
located in Shutdown Group D.
A detailed test program was conducted.
j Results of the tect program revealed that control rod No. 18 can be l
withdrawn from the core, but does not properly drop into the core.
4 Due to this fact, Yankee has chosen to compensate for the shutdown l
requirements of control rod No. 18 by adding the equivalent of the l
calculated 1 1/2% AK/K worth of the most worthy control rod as follows:
1:
l:
1.
REDUCING PLANT OUTPUT Plant output shall be limited to 83% of full power.
o l
8011210 k Q
norm cu 8
l$
(
(
l, '
1 United States Atomic Energy Commission Proposed Change No. 100 Attn: Div'ision of Reactor Licensing May 16, 1972 s
I 2.
INCREASING THE MAIN COOLANT BORON CONCENTRATION AND
,j INCREASING THE CONTROL ROD WITEDRAWAL PROGRAM
!!ii Figure 103-5 allows the plant to achieve criticality with control rod group B at 50 inches. This restriction has been increased to allow criticality with control rod group A at 35 inches (See attached revised figure).
To accomplish this il and add a portion of the required shutdown, the main coolant boron concentration has been increased to approximately.
2350 ppm at zero power. A reanalysis of the boron dilution accident at 2400 ppm and full power has been completed. The full power boron dilution reactivity addition rate during four loop operation increases from 9.4 x 10-6 AK/K per second at 2000 ppm to 11.3 x 10-6 AK/K per second at 2400 ppm.
Referring to Figure 401-1, it is seen that the minimum DNB RATIO during the transient actually improves, going from 1.61 to 1.66.
For three loop operation the reactivity addition
!I-rate during a boron dilution incident increases from ll 10.7 x 10-6 AK/K per second to 12.8 x 10-6 AK/K per second.
- )
From Figure 401-2 it is seen that the minimum DNS RATIO during the transient decreases frou 1.92 to 1.88.
In either mode of operation, a large margin to DNB still exists.
l' Boron dilution incident during other conditions need not be h
considered since the initial-conditions do not change.
3.
REDUCING THE OPERATING AVERAGE TEMPERATURE The main coolant average temperature is reduced from 530*F to 514*F.
4.
INCREASING THE SURVEILLANCE PROGRAM A.
EXERCISE - The normal control rod exercise program shall be continued.
B.
CONTROL ROD DROPS - The plant will be taken off the line and control rod drop times measured as follows:
3 a) The first weekend after five equivalent full power days.
b) Then the'first weekend after nineteen equivalent full.
power days.
O G '
United States Atomic Energy Commission Proposed Change No. 100 Attn: Division of Reactor Licensing May 16, 1972 i
c) The results of the drop times.shall be analyzed for substantial changes or increases in the trend.
If analyses of the data reveal that additional control rod difficulties are developing the U.S.A.E.C.
shall be notified.
I d) If no substantial changes or trends are observed, control rod drop times shall be obtained within every sixty days thereafter.
A detailed review of all 24 control rod drop times for Cores VI, VII, VIII, IX and X has been completed. The results of the control rod drop time review indicates that only a slight trend in time can be observed on the average control rod drop times for each Core.
CORE AVG. DROP TIME I 24 DROP TIMES
=
24 VI 1.51 VII 1.53 VIII 1.56 IX 1.59 X
1.79 As a result of the detailed review of control rod drop timec, the review of Core X accident analyses and the proposed mode of operation, it is our opinion that the plant can be safely: operated at the proposed reduced power level for the duration of Core X.
Safety Consideration: In our opinion, the proposed change does not present significant hazard considerations not described or implicit in the license application as amended.
Schedule of Change: This change will be put into effect upon receipt of your approval. The plant refueling and low power start-up test program have been completed. The plant awaits approval on this matter in order to proceed with power operation.
Respectfully submitted, YANKEE ATOMIC ELECTRIC COMPANY M b.
Donald E. Vandenburgh Vice President
s 4
/_
f b
L e
....m _.. b
_1.
- m. 4._e.
4.__.. __ l.~.T kW_...
~
..T._....
_._._~.
.....L._....__. _, _.
.._a t._...
.. +....
d...
. _. _.. _.-.. _.-._.a,-.
.,..._i._..._
. +.
... _..._.4
.m
< _ _ ~ - _ _..
_q-100 t_...
. ~ _........
.._.-t_.
.4.
s
_.s__....
4-.
..p._.
+,...._.e.+.......
4.
._d.e__,...,._
..s
_9+
.e
...4...
4__.
.p..
..4
... 4. I
,.._.b
_+.
+ -..__.4....
,.,_.J q
,4
..._g_,_,_. _ _.,
+.
.. +....+.
m...,
. + _
.4_.
F-
_ + 1__.i_...... _ - _.. _
.. +..
. _j _.
.r m...
..a_.,
4.4.
. __. L.__,.. I, '* _ a 80 4
. - +.. _..
..._.4_.
...., > +
..f+.
.p-
_4_.
.m~
1
...-. _ +
_ ^
j.........._t._......,*_<
' ~.. *.. _.,
--..-M._t.-._.-
.. _..v._ _.
_.-.. _ +
e_..
.+
-.._._b.
g.
7_
_.4._._...+.e.,_......-
._4.._
4....p
_. m_ _..+.. +._._. _ _.
_4 9.
..J.
y..
--+
._.L_-
..,. q.
____,.J.p_..
- .__4._
+ _.._ - -.
60 4,.-
...._t,._.....__-
1 y
._.4._...__
w....
_..J
-v
_,__..3.-._.. __ _
r.,.
9.
...,. _ _ _._.4
_,. _ _ _.. +. - _.
O
-.+~.. _.
-.. _.... _ - +.... - ~ - -. m.+ - - _ _ -. - -. +. _.. _.
y L_
_ o
._.A...
_..o___.
_.9_.,.._.. _.. _ _
_.2,
p.
.._..._.,.._..:=1_....._._.-.y,.9_.
~
'w*
+
9
.. _.. _. _.._.____._t_***"'**'"*^*9**_*~_
o m..__.._,._____.t_._
.t__.__._. _. _. _.-
ho a.
.._,___._.4.._
. _.. _.._.._..__-,..r._-._-_..
. - -,. _ _. _ _.. _4___.
,_.e_.
....,-._a __... _ _.. _. _..
__ t
.~~_._..__a._.._...__.a____L._._.,._.__.
w..,.. 1 --.__.,_____.1
_. _. _.. _ ~... _. _.... _.. _
a.__.
._.._,._.._._.._a.__._.,._.__.__..&____
- _....u__.
._._._._4.
20
.._.....__J__-_...__a
_a. __..._.. _. _. _ _.. _.._...__.1__.__._.___... _..... _. _.. _ _. _.
_.rn,
_y___.
._.a._._.__..._..
1_.__
.._..t_.___.,.__._,_.__.d
. _. _ _._-._L._...._...
+
._L_..__
. _. _.,. _.. _. _. _.._.____a.._.__..____. - _. _ _, _ _ _ _ _
_.__4_.___..___ _ _. _.. _. _... _...
._.__.___u.__.__
......_L._..
.. _. t __..n_a..._.
.....r_.._.,.__ ___._ _
7*_~
0
~
^
0 10 30 50 70 90 GROUP B 0 10 30 50 70 90 GROUP A CGiTROL ROD POSITIO:!, ECES WITERA'.CI W+. M Q M @ a Da.,4 WsU Mh WL u
%c h
!j WT a.~
,,,N, _ _...,"v.~.
- L J..~. :
s aw..
s.
,. r. - ~l C. n ; bp.,
RCD G.m.v1.,) F00ImIu
,/S. 2 u.e $.
7. e.,.
I VM.
m n~
3_.;-
2 r.
___ = ~j --
,m e-. _ _ _.
~
9 9
1 United States Atomic Energy Commission Proposed Change No. 100 Attn:
Division of Reactor Licensing May 16, 1972 COMM0L'EALTil 0F MASSACllUSETTS)
) ss.
COUNTY OF k'ORCESTER
)
Then personally appeared before me, Donald E. Vandenburgh, who, being duly sworn did state that he is a Vice President of Yankee Atomic Electric Company, that he is duly authorized to execute and file the foregoing request in the name and on the behalf of Yankee Atomic Electric Campany, and that the statements therein are true to the best of his knowledge and belief.
I An & A
- l
/
Armand R. Soucy Notary Public My Commission Expires September 9, 1977
m q u >v n t,a iu mu. _. du vue.g.'
M,u uma,
,u~
M) k n,,ky,s
,-r g,-
.pq
<=
Im p
.o.
, O, :,, p.o rbW:itd CONTROL NO:
2635 i
..a d U %ii.M b J U Qfil3 \\2hihm 730;gYankee Atomic Elec. Co.
DATE OF DOC:
DATE REC'D LTR MEMO RPT CffHER Westboro3 Mass. 01581 Densld E. Vandenburgh 5-16-72 5-17-72 X
TO:
C.t iG CC CffHER SE;;T AEC PDR Y
DL 3
SE:rf LOCAL PDk CLASS:
' ?;O? I:.iG Ita'UT
- iO C'id XEC'D DOCKET NO
X 40 50-29 DE5CP.!PT;Cu :
L:;CLOSUiUiS:.
Ltr netari ci 5-16-72, requesting charge to Tech Specs, sub=itted as Proposed Change No.
100.....
W/ ' Attachment-IIKI232 fig-10, -5 20 \\0" EV0E ACD!0WLEMED m.,.-.
vro..nminn /rwoommim 5-17-72 AB E'iTLER(DRL)
DICKER (DREP) iCCE:ZL(DRL)
ZIEMANN(DRL)
W/ Ccpics W/ Copies W/9 Copies W/ Copics U/ Copics CHITWCCD(DML)
GC'T T.~d(DRL)
SCHR::iCER(DRL)
W/ Cepics W/ Copies W/ Copies W/ Copics P/ Copics CLUC.:(DEL)
KNIEL(DRL)
STOLZ(DRL)
W/ Copics W/ Copics W/ Copies W/ Copies L'/ Copics H. DE':TCN KNIGHTON(DREP)
VASSALLO(DRL)
W/ Ccpics W/ Copics W/ CcI'es W/ Coplei U/ Copics
= - - - - -
w:"U.T. nTn'mTpumTm gGac ; 711cf Q Volir.Or(DaL)
O H. Fitrpn trick (DaE?) M M. Jinks
%"./
@,:C PDR O S1ii;cr(TJ L)
O r.asencr(Daz?)
O
@ Ccapiir.nce(2)M O Lonr.(DaL)
QLic. Asst (D23P)
O CKOCC, ;;a ? 505A Q Collins (D:tL) 02cCrc1 css (D'12P)
O 6::untzins & Staf ~
@$.Tho psoa(DRL)
O G. cic.r.c(Das?)
O C ::orri c/RS c/;.'ilboa(D3L)
O D. E. ::unn(D:'L)
O Project Leader (D12?) O 0::crris/sch cedcr(D3L)
O Denaro a(DitL)
O Day.? rtie zoo.a o
)$ Dobc/1.
. (D3L)
O E. G. ccs2(DRS)
'O A. Draitman(SLR)
O
% 3cyd(DRL)
G:;cccary(D;S)
D Caltzmar.(SLR)
U Q Da'.*ot.n3(DaL)
O Srcllo(r.:<s)
D Trcrac1(DIP)
O 0 :'. D en tor.(D tL)
- v. :: core (D::c)
O Taocnt on(:. ::4)
O
.O Kicchcr (".U.)
O Lan;p(i,; 0)
O : nu t:i(D:!S)
C O Gri=%(DM.) i O Sr.iley(D::I.)
O shco (r.as)
O O Gcrmill(D1L)
O L no:prn(DRCP)
O 2.wlicki
(;n3)
O C Tec'esco(T.L) 01ulier(D2:?)
0$ we,an;t. (D:L O
ErfERI:AL DISTRIBWION
~~
l - Lccal PDR
)
1..- SAN /IA/NY/ PDR
%1 - DTII(Laughlin)
JC - NSIC(Buchanan) 1 - AEC HQ LIB J-004 1 - ASL3(Yore /Woodard 1 - R. Carroll OC, GT l-- Chief Water Reactors "H" St) 16 - Holding for ACRS 2 - Warren Nyer 1 - C. 1*.iles, C 459, GT 1 - R. Catlin,(A-170, GT 1 - Consultant Nev:r. ark / Blum/ A abian) 9 - Naticnal Laboratories.
6
(:a;t/oR:: tin:.;L)