ML19351E243
| ML19351E243 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 12/20/1971 |
| From: | YANKEE ATOMIC ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML19351E242 | List: |
| References | |
| NUDOCS 8011260337 | |
| Download: ML19351E243 (8) | |
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r YAliKEE NUCLEAR POWER STATI0Il i
OPERATIOff REPORT Iio.131 1
For the Month of
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Ilovember 1971
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I Submitted by I
YANKEE ATOMIC ELECTRIC COMPANY l
Westboro Mas:;achusetts December 20, 1971 1
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l This report covers the' operation of the Yankee Atomic Electric
. Co'apany at Rove, Massachusetts, for the. month of November,1971.
l 1At the start of the. period the plant was in a cold shutdown condition for the purpose of effecting repairs to the No.1 steam generator.
The hydco test on October 31 identified one leaking tube. On November 1 a tube integrity test utilizing an eddy current probe technique revealed seven additional tubes to have localized defect penetrations of greater than 50. percent of the tube'vall. The eight tubes were plugged utilizing explosive velding of a thimble type. plug to the tube internal surface.
Work area radiation levels in the inlet and outlet water boxes were 5-2h r/hr and h-16 r/hr respectively'.*
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On November 3, new diaphragms were seal velded in the manvays, and the manvay covers were ins +
-d.
Pressurizing the primary side to h50 psig indicated no leakage of the ciaphragms.
Plant heatup was commenced on
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. November h.
i On November 5 at'0205 hours0.00237 days <br />0.0569 hours <br />3.38955e-4 weeks <br />7.80025e-5 months <br /> the reactor was brought critical; at 1146 hours0.0133 days <br />0.318 hours <br />0.00189 weeks <br />4.36053e-4 months <br /> the turbine generator was phased to the high line; and at 1h15 hours plant load was increased to 540 MWt.
On November 6, plant load was increased to full power operation. During the balance of the report period l
plant load varied bex.veen 160.2 MWe and 177 5 MWe as the circulating water inlet. temperature fluctuated oetween 51 F and h2 F.
9 period commenced with return to power operation and continued through the The eighth, Core IX vapor container air leakage surveillance report period. Leakage'during the period was normal.
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The eddy current test and tube plugging were erroneously reported in f
Operation Report 130 for the month of October, 1971.
j Plant Abnormal Occurrences i
There were no plart abnormal occurrences during the report period.
Plant Load Reductions l
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-November.TL. (1350-1655):
Load reduction to 90 MWe to plug three tubes in
.the East water box of the main condenser.
November 17 (1150-1212):
Plant load reduction to 17h MWe for turbine control valve exercising.
'l Plant Shutdowns I
Shutdown No.. 119-10-71:
Scheduled plant shutdown which commenced 10-29 (Continued) for steam generator leak repairs; and which was terminated 11-5-71.
Total outage time: 157 hours0.00182 days <br />0.0436 hours <br />2.595899e-4 weeks <br />5.97385e-5 months <br />, O
4h minutes.
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Plant Maintenance The follcving is' a list of pertinent maintenance. items performed by'the.-plant staff during the month of November, 1971:
- 1. ;The internal components were replaced in the 20:gpm orifice isolation
-valve,-CH-MOV-526.
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'2.
The plug and-seat' vere replaced on the vari-orifice valve.
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3.
The rod position indication coil stack for the No. 3 control rod-was replaced.
E. -The turbine ' low pressure gland steam regulator valve was replaced.
5 Four leaking tubes:in the No. 3 feedvater heater were plugged.
I A new mot'r operated control valve was installed in the discharge
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line.of the No. 1. Service Water pump.
Instrumentation and Control l
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The following is a list of' pertinent maintenance items _ performed l
. by the plant staff during the month of November,1971:
- l 1.
The main coolant pump flow characteristics test was performed.
2.
Installation of the plant radio communication equipment was completed.
3.
The turbine-generator, vibration monitoring system was calibrated.
Reactor Plant Performance The following parameters were determined.by means of incore instrumentation:
5 562 MWt; 517.3 F Tave; Control Rod Group A,B,C,D, @ 89 ;
3 0.5 ppm boron l
F
=19 q
AH = 2.0 i:
Minimum DNBR = h.0 Maximum outlet temperature = 578.0 F.-
-Secondary Plant Pcrformance Feedvater heater terminal differences were as follows:
-No. 1.= 5.5 F-No. 2 = 9.0 F' No. 3 = 5 9 F.
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The condenser performance was as follows:
172.2 MWe; 1.19" Hg B.P. ; 567 MWt; 47.0 F C.W. in; TTD 28.7 F; i
cleanliness factor = 70%.
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Chemistry At the start of the period the main coolant bc con concentration l
and pH were 1315 ppm and 5 1, respectively. Boron dilution coincident
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with plant startup-reduced the concentration to 48 ppm on November 6.
At this time' anion exchange was commenced reducing the boron to 0.2 ppm as of l
November 11.
On November 11, the anion bed was removed and ammoniation of a new mixed bed and the reactor coolant system commenced. The average ammonia concentration and pH for the duration of the report period were l
12.h ppm and 9.97,-respectively.
j The main coolant beta-gamma specific activity and crud level averaged 9.90 x 10-2 ue/ml'and 0.04 ppm respectively.
t The main coolant tritium concentration was decreased to 7.14 x 10-2 ue/ml on November 6 due'to dilution. At the end of the period the tritium f
concentration had increased to 1.09 ue/ml.
The-iodine-131 specific activity averaged 1.73 x 10-h ue/cc and~
the iodine 131/133 atomic ratio averaged 1.Th.
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A crud sample for the month collected on November 15.had the following radiochemical analyses: dpm/mg crud cr-51
""-5 1.08 x 108 6
Fe-59 6
'2.00 x 10 2.30 x 10 Co Co-60 Ag-10M 6
5 7
5.55 x 10 1.23 x 10 3.77 x 10 A main coolant gas sample, collected on November 17, had the j
following radiochemical analyses: ue/cc gas Xe-133 Xe-135 Ar-41 1.12 x 10~1 3.50 x 10-2 3.h3 x 10-1 Health and Safety One shipment of 62 drums of low level waste containing 313.8 me
-vas made during the period.
Waste disposal liquid releases totalled 111,909 gallons containing-0.121 me of gross beta-gamma activity'and 224.15 curies of tritium. Gaseous releases during the period totalled 0.174 curies of gross beta-gamma activity.
Secondary plant' water discharged totalled 330,804 gallons containing 0.236 i
me of gross beta-gamma activity and 0.993 curies of tritium.
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l In adidition to the above releases 2.036-curies of tritium as a l
vapor was discharged to the'the environs during-the. report period.
.i Radiation. exposure for Yankee plant personnel.and N.E.P.S.Co.
. personnel as measured by film badge, for the month of November 1971 were:
l Yankee Plant Personnel.
Average accumulated exposure dose: 27h mren.
i Maximum accumualted exposure dose:1030 mrem f
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- N.E.P.S.Co.
Personnel i
Average accumulated exposure dose:
347 mrem Maximum accumulated exposure dose: 703 mrem
- Exposure' determined by film badge minus dosimeter readings for last j
'two days of October.
Operations Attached is a summary of plant. operating statistics and a plot of daily average load for the month of November, 1971.
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l-YANKEE ATOMIC ELECTRIC COMPANY
' OPERATING SU'O' arf November 1971
. ELECTRICAL MONTH YEAR ~
TO DATE Gross-Generation KWH 105,230,900
'1,398,756,900" 12,894,628,200 Sta. Service (While Gen. Incl. Losses)
KWH 6,59h,859 85,205,622 833,230,6h7' j
Net. Output KWH.
98,636,041 1,313,551,278 12,061,397,553.
Station-Service 6.27.
6.09 6.h6 Sta. Service (While Not Gen. Incl. Losses) KWH 203,300 810,283 33,099,138.
. Ave. Gen. For Month (720)-
.KW 1h6,15h.0 Ave. Gen. Running (612.23)
KW 171,881'.3 PLANT PERFORMANCE-Net Plant Erriciency 28.29 28.h6
'28.48 Net Plant Heat Rate btu /KWH 12,063
.11,991 11,983 Plant Ca.pacity Factor
~%
80.70 95 97; 76.89 1'
Reactor Plant ~ Availability 86.38 97.33 85.06-i NUCLEAR MONTH CORE IX
. TOTAL-1 Hours Critical HRS 621.92 8,620.3h 83,584.74 I
Times Scrammed 0
.3 64 Burnup Core Average KJD/MTU 699.26 10,154.00
. Region Average M4D/MTU A (INITER) 724.19 9,938.57 27,1h2.24 B (MIDDLE) 803.37.
11,889.58 20,631.43 C (OUTER)'.
592.55 8,444.01.
8,44 h'.01 D (ZIRCALOY) 1
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