ML19351D998
| ML19351D998 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 01/21/1963 |
| From: | YANKEE ATOMIC ELECTRIC CO. |
| To: | |
| References | |
| NUDOCS 8011250378 | |
| Download: ML19351D998 (8) | |
Text
,o p.
4 t i,. 9'
- -,, t, - _
- yv,
.wo
.h J ab
... ma.. -.. ~
t.
fpr7Y 'i ZsREi
-E i:
i' YANKEE NUCLEAR POWER STATION-1 o
1 I
r OPERATION REPORT NO. 214 i-i f
. For t'te month of l
i-1 DECEMBER 1962
'h 1-t i,
1:.-
I :.
4 i
t u
i.
a e '
3-i i.
Submitted by' YANKEE ' ATOMIC ELECTRIC COMPANY
' Boston Massachusetts I
January 21, 1963 gn; bO /
-w. >\\ -.o = x/, <q,;,s g
~
I-r.
A R
/
l-j,
_y
.v-
@ /...
- j f;( * <. f, : ", ^,Q
^,r fg_
...m -
. j -,; N,'
g['
' )s;t f.
,/ /% ]
- 9,.
~l ~
s
-,',.,I'
.% j'r-4 5
r
+
f.A;.s.'#
!. Q*
7
,n g o sW R
i
__L;.L.---;__..._....._,~~:__.,-_---.-----_,a..--.---..-._-----~~---------
p d
o /L Pgy.
TMa yr port covers the operation of the Yankee Atomic Electric h,,
Company plant = at Rowe,' Massachusetts for the month of December,1962.
. The plant remained in continuous operation throughout the per-f iod 'and with the exception' of a'brief period when load was mduced for
/
' replacement of a broken turbine control valve compm ssion spring bolt, the full licensed power level was maintained. Accordingly, a monthly plant record of.125,6h0,100 gross KWHe was established in December.
Plant operation throughout the period was, in general, routine.
Ability to maintain the condenser circulating water 41 phon resulted in improved turbine back pressure during the month. A brief inspection in-side the vapor container was made during December and disclosed no unusual conditions.
On December 12, a test was conducted to' determine the effect of an increase in main coolant pH and NH3 com entration on core reactivity and coolant chemistry. The test began on t.te morning of December 12 with the addition of hydrazine_(N Hh) to the main coolant system. ' Approx-
,m 2
O imately 2h hours later, a 30 gpm purification flow was initiated and the system wat,r chemistry was gradually restored to normal. A more thorough description-is presented in the section "SPECIAL TESTS".
Nine fuel assemblies for use in Core III were delivered to :he plant during December. This marked the first shipment of Core III fuel.
No reactor scrams or. plant shutdowns occurred during December.
Maintenance Following is a summary of major activities carried out by plant maintenance personnel during December:
1 Inspected No. 2 primary drain collecting tank pump.
- A 2.
Inspected No. 2 gravity drain tank pump. New shaft bear-U ings were installed and several areas of the shaft were spray welded.
- 3. ' Replaced carbon rings and piston in No.1 Control Air Compressor.
- h. Adjusted bolts on the right hand moisture separator flange in an attempt to eliminate a slight steam ler k'.
A new gasket will probably be required to stop the.eak completely.
- 5. Renewed-a broken closing spring compression bolt on No. h-turbine control valve.
\\
k -
r-O
[,
6.
Continued the-installation of an air removal system on the m( )
condenser circulating water discharge.
7.
Installed a sample line on the spent fuel pit ion exchange return line.
8 Heat traced the steam generator steam sampling line and the l
hydrogen seal oil unit vent to prevent freeze-up of the lines.
9.
Inspected the station service air compressor.
Chemistry With the exception of the period when hydrazine was added to the main coolant for test purposes, primary plant water chemistry varied little from preceding months. Main coolant oxygen levels remained extremely low with concentrations maintained at or below $ ppb during the period. The main coolant specific activity continued to remain at approx-(j, imately 1.5 x 10-1 nc/ml throughout the period. The coolant crud level likewise remained low, averaging approximately 0.10 ppm except during the coolant hydrazine test when the crud level increased slightly. A des-cription of the observed effects of the hydrazine addition to the main coolant system is included in the section "SPECIAL TESTS".
1 The main coolant I-131 activity ranged between 6.3 x 10-3 and n
8.0 x 10-3 pc/ml during the period with a corresponding I-131/I-133
'_)
atomic ratio range of 3.2 to 3.5.
The results of a main coolant fission gas analysis during December indicated:
Xe - 135 6.h x 10-1 nc/ccgas Xe - 133 2.1 pc/ccgas Kr - 85m 3.0 x 10-1 pc/ccgas
(')
\\/
A waste gas system analysis indicated:
~
Gas Decay Drum No. 2 2.1 x 10 pc/cc Kr-85 Gas Decay Drum No. 3 7.0 x 10- pc/cc Kr-85 Gas Surge Drum 8.6 x 10~ pc/cc Kr-85 Reactor Plant Performance Core reactivity changes were followed closely before, during and immediately following the main coolant hydrazine test to permit evaluation of the change in water chemistry on core reactivity. A des-cription of the reactivity behavior is included in the section "SPECIAL TESTS".
,/~y Q!
e
r O -
Preparations for a test to demonstrata the use of boric acid in the main coolant system at power and with concentrattonb)upoto hD0 ppm boron were made during Decenber. Since such operali.on is contra y to the provisions of section D.2.d. (6) of the Technical Specificatius, A.E.C. approval for a temporary waiver of this restriction is required.
On December 21, the test procedure and a request for its authorization was submitted to the Commission.
The following were determined by means of in-core instrumentation measurements at a power level of $h0 Edt, control rod groups 6,b,2 and 3 fully withdrawn, and groups 5 and 1 fully inserted:
F
= 3.25 q
Fd T= 2.95 liinimum QDIG ratio = 2.5 o
Turbine Plant Performance
(
Analysis of steam line vibration continued during December.
A vibration test on a section of the main steam piping was conducted using tension dynamometers. Alternately tightening either one or the other dynamometer to a load of 6000 pounds had a negligible effect on reducing the vibration.
/7 The circulating water discharge siphon remained normal during the month. The installation of a test air removal pump was nearing completion at the end of the period. The pump, with connection to the circulating water discharge line, will be tested to determine whether entrapped air can be removed to restore the discharge siphon. Since the air problem is intermittent, the pump will not be required to be in continuous operation.
Plant calorimetric data and routine secondary plant performance
'l data were acquired and analyzed during the month.
Health and Safety Liquid waste with a total of activity of 0.hl millicuries was discharged from the plant during December. Thirty-one drums of solid waste containing 70 millicuries were shipped for off site disposal.
Waste gas containing 5.0 curies was also discharged from the plant during the period. At all times the concentration of waste products discharged from the site was well below the maximum permissible.
Fallout measurements were made inside the vapor container dur-ing December. One foot square fallout papers placed on the shield blocks over the entrance to each main coolant loop at the charging floor for period of h to 27 days showed no appreciable difference in
p
,y o
6
-h-activity as a function ~of-time.
Similar fallout papers were.mountrd (m) at the edge of the shield-tank cavity and inclined at an angle'of h'i degrees-in the path of.the air. circulation from the cavity. The papers showed negligible Ag-110m activity after a seven day collection perici.
While the papers on the sh163d blocks indicated activities on the order of 2 x 103 2
DIM /ft -(Ag-]l0), it is questionable whether the activity is the result of actual fallout or transport of surrounding surface contamination to the fallout papers in light of the lack-of increase in activity with time.
An air sample collected on the charging floor over a h8 hour periodindicgedthatactivityremainingaftera2hhourdecaywasless than 1 x 10-Jic/cc.
Personnel exposures as measured by film badges for.the month of November 1962 were as follows:
-Average for all station personnel 1h0 mr
=
6h0 mr
' Maximum individual exposure
=
Continuous' monitoring of off site airborne activity during
' December indicated levels consistent with pre-operational levels, Special Tests q
During December a test was conducted to determine the effects b
on. core reactivity and main coolant chemistry resulting from the addition of hydrazine to the main coolant while at power. Two similar tests were conducted late in Core I life (March 1962). The December test was run to investigate the system behavior when subjected to such a chemical addition relatively early in Core II life.
On December 12, at 9:23 A.M., approximately 2.7 gallons of -
12% hydrazine (N Hg) was injected into the main coolant system over a 2
period of approximately 90 minutes. The main coolant NH3 concentration, which was essentially zero before the test, increased to a maximum of i
7.30 ppm some 2 1/2 hours after the initiation of hydrazine injection.
The system pH showed a corresponding increase from a pre test 7.00 to a peak of.8.70.
As was experienced during the Core I hydrazine tests, a gradual increase in core reactivity accompanied the increase in NH3 con-centration and pH. The reactivity insertion commenced about two hours after the hydrazine injection began and leveled off approximately 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> later. The total reactivity insertion, including normal burnup, amounted to 0.3h%
K K and agreed-generally with previous test results
(~ 0 32 to 0.36 K). After the rei atirity gain reached a peak, a 30 gpm purification flow was initiated. The reactivity loss rate then increased until it reached a value equal to 8 to 9 times the normal P\\f
u ef burnup rate. -This rate was maintained until.the loss reached the value which would have. been expected from normal burnup during the elapsed per-iod. The loss rate then decreased to the normal burnup rate and analysis
-indicated that within. the limits of the data no. apparent net gain in reactivity had occurred
.1.6 x 10- ~sc/ml and a minimum of 1.0 x 10-Themaincoolantspecificactivit{pc/mlduring reached a maximum of 1
-(pre test 1.2 x 10-1 pc/ml). As in-the previous tests, the minimum specific activity was reached immediately after the hydrazine addition, the activity. increasing gradually until purification ficw was resumed.
Pre test boron concentrations varied between 0 and 0 3 ppm.. An increase in boron concentration to 1.50 ppm was noted immediately after the start of the test, the concentration decreasing to 0.10 ppm before system purification.was re-established on December 13, at 9:20 A.M.
Ion
. exchange purification restored the. system NH3 concentration and p!: to normal by December 15.
.A The crud levels and activities are best illustrated in the V
following tables Date
-Crud Mn-$h Cr-51 ppm dpm/mg dpm/mg
~
x10->
x10-0 12-10-62 0.123 6.8 h.3 12-12-62 0.173-h.8 5.6 12-13-62 0.267 37 5.h 12-17-62 0.100 7.h 10 3 110m Fe-59 Co-58 CO-60 Remarks Ag /mg dpm/
d dpm d
x 10g x 10-h x 10-x 10 10.0 6.1 h.h 8.1 Pre Test
-Q 6.8 7.2 h.h 10.7 Pre Test 8.0 5.7 2.h 11.7 During Test 16.0 10.2 7.0 16.9 After Test The test results corroborsted earlier test results with respect to reactivity changes associated with system NH3 concentration and pH changes. Futhermore, it proved that the effects were generally inde-pendent of core lifetime, sbnilar results having been obtained on two identical cores at quite different stages of burnup.
Plant Operations Attached is a summary of plant operation statistics for the month of December 1962, and a plot of daily average plant load for the same period.
S=
O o
O o
O m
i YANKEE ATOMIC EIECTRIC COMPANY - OPERATING -SUfMARY DECEMBER 1962 EIEC1RICAL MONTH YEAR TO DATE Gross Generation KWH 125,6h0,100 7ho,12h,700 1,701,h72,000 Sta. Service (While Gen. Incl. Losses)
KWH 7,580,869 53,22h,h85 130,756,567 Net Generation KWM 118,059,231 686,900,215 1,570,715,h33 Station Service' E
6.03 7.19 7.68 Sta. Service (While Not Gen. Incl. Iosses)
KWH 0
3,877,120 13,968,838 Ave. Gen. For Month (7hh HRS.).
KW 168,871 Ave. Gen. Running (7hh HRS.)
KW 168,871 PIANT PERFWMANCE Net Plant Efficiency 29.39 28.'96 Net Plant Heat Rate Lbs. SteasVWet KWH Btu /KWH 11,608 11,78h Circulating Water Inlet Temp.
13.95 1h.00 a
.m Maximum 8
F 39 Mi n4 --
0 F
Plant Operating Factor 33 99.98 5h.h6 61.8; i
NUCIEAR MONTH CORE II
_TO DATE i
Times Critical Hours Critical 0
27 289 Times Scramened 7hh 2h89.52 15,736.95 HRS d
O 2
32 Equivalent Reactor Hours @ $h0 MWt HRS 7h3.9 2211.1 9,960.9 Average Burnup of Core MWD /mtU 80h.7 2391.9 Control Rod Position at Month End 4
Equilibrium at $h0 MWt Group 1 Rods out-inches 0
Group 2 90 Group 3 90 Group h 90 Group 5 26 5/8 L
Group 6 90 i
)
2 A
s
YANKEE ATOMIC ELECTRIC CCMPANY DAILY AVERAGE LOAD for DECEMBER 1962 r
150 -
a E
n u8 100 -
i Q
O J
b 2
W 50 -
3d
<O e
5 5
5 g
5 5
5 g
g g
g e
g 5
10 15 20 25 30 DAYS e
e e
O e
r w"
--