ML19351E252
| ML19351E252 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 09/21/1971 |
| From: | YANKEE ATOMIC ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML19351E251 | List: |
| References | |
| NUDOCS 8011260366 | |
| Download: ML19351E252 (7) | |
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YANKEE NUCLEAR POWER STATION OPERATION REPORT NO. 128 l
For the Month of i
August 1971 I
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Submitted by YANKEE ATOMIC ELECTRIC COMPANY Westboro Massachusetta 4
September 21, 1971 8011260 hp
'32 R
This repcrt covers the operation of the Yankee Atomic Electric Company at Rowe, Massachusetts for the month of August, 1971.
During the period plant load varied between 175 0 MWe and 179.2 MWe as the circulating water temperature fluctuated between 63 F I
and Sh F.
The sixth, Core IX vapor container air leakege surveillance period continued through the report period with normal leakage noted.
Plant Abnormal Occurrences t
l Abnormal Occurrence No. 71-3 " Waste Gas Leakage".
On August 30, 1971 a review of recent vaste gas surge drum pressure readings indicated the possibility of leakage from the vaste gas system.
Inmediate testing located leakage inside the hydrogen analyzer c abi net. After isolation of the analyzer, extensive testing of the entire vaste gas system showed no significant additional leakage. Upon reestab-lishnent of its integrity the hydrogen analyzer was returned to service.
A total volume of 2700 ft3 of gas was accounted for at a release rate of 0.019 cen. A ceiling exhaust fan with a capacity of 2100 cfm provided a dilution factor of approximately 1.1 x 102 9
The total activity released due to the leakage was 28.680 me.
The concentration of the released gases after dilution was 3.hl x 10-9 ue/cc.
Plant Load Reductions August 3 (1905-2015):
Plant load reduction to 139 MWe due to an electrical storm.
August h (11h5-1222):
Plant load reducticn to 167 MWe for turbine control valve exercising.
August 5 (0300-0602):
Plant load rcduction to 136 MWe at request of REMVEC dispatcher.
August 11 (12k5-1625):
Plant load reduction to 135 MWe due to an electrical storm.
August 12 (1150-1325):
Plant load reduction to 130 MWe for turbine throttle valve exercising.
August 19 (11h5-1220):
Plant load reduction to 169 MWe for control valve exercising.
August 25 (1155-1230):
Plant load reduction to 168 MWe for turbine 9
control va?ve exercising.
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-E-Plant Shutdowns There were no plant shutdowns during the report period.
t Erratum: Operation Report No. 127, page 2, Plant Shutdown No. 117-9-71 l
should be corrected to read 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> and 38 minutes.
Plant Maintenance The following is a list of pertinent maintenance items performed by the plant staff during the month of August, 1971.
1.
The No's. 1 and 3 charging pumps were repacked. A new plunger was e
installed in No. 1.
2.
The gravity drain tank No. 1 pump was replaced.
Reactor Plant Performance The following parameters were determined by means of incore instrumentation:
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599.2 MWt; 526.0 F Tave; Control Rod Group A @ 88, B,C,D, @ 88 ;
292 ppm boron F
1.9
=
q F,h, =
2.0 u
i hiinimum DNBR = 3.5 Maximum outlet temperature = 590.0 F i
Secondary Plant Performance Feedvater heater terminal differences were as follows:
No. 1 = 5.2 F No. 2 = 5.6 F No. 3 = 5.1 F The condenser performance was as follows:
I 175.1 MWe; 2.62" Hg B.P.; 595.0 MWt; 63.3 F C.W. in; TTD = 26.h F; elennliness factor = 66%
Chemistry The main coolant boron concentration was reduced from 333 ppm to 228 pps to ecmpensate for normal core depletion.
l The main coolant pH averaged 5.6 during the period.
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The main,,ccolant beta-ga.ma specific activity and crud level j
averaged 9.8 x 10 ' uc/ml and 0.01 ppm respectively.
Toe main coolant trftium concentration averaged 1.85 ue/ml during the report periods The lodine-131 specific activity averagea 2.52 x 10-ue/cc and the iodine 131/133 atemic ratio averaged 1 9h.
1 A erud sample for the month collected on August 6 had the following radiocnemical analyses :
dpm/mg crud 4
Cr-51 Mn-Sh F*-59 7
6 6
1.65 x 10 1.37 x 10 3.69 x 10
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Co-58 Co-60 Ag-110M 0
5 8.96 x 10' 1 99 x 10 2.98 x 10 A main coolant gas sample. collected on August 11, had the folleving radicchemical analyses: ue/cc gas Xe-133 Xe-135 Ar h1 1.3h 1.10 x 10-1 5.87 x 10-^
4 Health and Safety 1
"No shipments of lov level vaste were made during the period 9
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consisting of 112 drums, and 1101.9 ft of miscellaneous waste with a total netivity of 2,LO2.7 me.
Waste disposal liquid releases totalled 3h,893 gallons containing 0.017 me of gross beta-gamma activity and 131.h8 curies of tritium.
Gaseous releases during the period totalled 1.620 curies of gross beta-I gamma activity. Secondary plant water discharged totalled h92,791 gallons containing 0.058 cc of gross beta-ga=a activity and 5.8h curies of tritium.
l Padiation exposure doses for Yankee plant personnel as measured I
by film badge, for the month of August, were as follows:
Average accumulated exposure dose:
47 mrem Maximun accumulated exposure dose:
290 mren Operations Attached is a summary of plant operating statistics and a plot of daily average load for the month of August, 1971.
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YAIWIE ATOMIC ELECTRIC COMPA';Y - OPERATING SU:O*ARY i
August 1971 l
ELECTRICAL MONTH YEAR
"'O DATE l
Gross Generation F"4H 131,0h3,500 1,0h2,195,000 12,538,066,300 Sta. Service (While Gen. Incl. Losses)
KWII 8,189,032 63,179,030 811,20h,07 i,'et Output iGlH 122,85h,h68 979,015,970 11,726,862,2h5 Station Service 6.25 6.06 6.h7 Sta. Servi.e (While Not Gen. Incl. Losses) KWH 0
488,883 32,777,738 Ave. Gen. For Month (Thh)
KW 176,133.7 Ave. Gen. Running (Thh)
KW 176.133.7 PLANT PERFORMANCE Net Plant Efficiency 27.70 28.56 28.49 Het Plant Heat Rate btu /KWH 12,320 11,9h9 11,979 Plant Capacity Factor 99.34 97.97 76.56 I-Reactor Plant Availability 100.00 98.88 84.88 NUCLEAR MONTH CORE IX TOTAL Hours Critical HRS Thh 6,584.39 81,548.79 Times Scrammed 0
3 64 Burnup Core Average M4D/ICU 889.51 7,770.64 l
Region Average M4D/MTU t
A (INNER) 893.59 7,51h.3h 24,718.01 l
B (!GDDLE) 1,036.59 9,124.11 17,865.96 l
C (OUTER)
Th2.14 6,hh6.69 6,446.69 D (ZIRCALOY)
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