ML19351E102
| ML19351E102 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 07/19/1968 |
| From: | YANKEE ATOMIC ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML19351E101 | List: |
| References | |
| NUDOCS 8011250602 | |
| Download: ML19351E102 (7) | |
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4 YANKEE NUCLEAR F0WER STATION OPE 9JLTION REPORT HO, 90 For the nonth of JUNE 1968 S
Subnitted b;c YANKEE ATCMIC ELECTRIC COMPAliY l
N Boston Massachusetts 7
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This report covers the operation of the Yankee Atomic Electric Company plant at Rowe, Massachusetts for the month of June, 1968.
During the period plant load varied between 175.6 MWe and 181.0 MWe as circulating water inlet temperature fluctuated between 45 F and 55 F.
On June 12 the monthly control rod exercise was performed.
During the exercise, voltage measurements frcm the coil stacks of control rod No's 17, 21 and 22 indicated difficulty in outward movement; inward movement was normal. At the conclusion of the exercise, rod No. 17 was left three steps lower than the other rods in the group.
Investigation of this problem is in progress and further testing vill be performed during the next control rod exercise.
Control rod groups B, C and D vere moved out one step to 87 3/8 as part of the Core VII rod step wear prc3 ram.
At the beginning of the period daily measurements indicated a higher than normal leak rate from the vapor centainer.
Inspection and testing of vapor container penetrations did not detect any abnormal leakage.
On June 17, the second Core VII air charge to the containment was initiated and the vapor container leak rate since the first Core VII air charge was computed to be 0.0h7% per day.
Leaksge measurements compiled following the second air charge indicated a normal vcpor container leak rate (0.02h% per day).
Plant load reductions during the period were as follows:
h June 5 (llh5-1338): Load reduction ta 135 MWe to test turbine throttle vslves.
June 9 (1930-2117):
Load reduction to lho MWe due to electrical storm.
June 9 (2130) -
Load reduction to lho MWe due to electrical June 10 (0210:
storm.
June 19(19h5-2150):
Load reducticn to lho MWe due to electrical storm.
No plant shutdowns or reactor scrams cccurred during the month of June, 1968.
Plant Maintenance The following is a list of pertinent maintenance items performed by the plant staff during the month of June, 1968.
I 1.
The generator carbon dioxide bottle station was relocated to the south-west corner of the turbine building.
This new location provides access to the bottles in the event of a generator fire.
4 2.
The yard area crane hook has been sent off site for radiographic and magnetic particle testing in preparation for spent fuel shipments.
r
, 3.
Spare reactor head studs are being cleaned; following inspection by
^7 manufacturer's representative, the studs will be refurbished.
h.
Packing rings in the No. 1 position of the No.1 charging pump vel i renewed.
Instrumentation and Control The following is a list of pertinent instrumentation and c0atrol maintenance performed by the plant staff during the month cf June,1968.
1.
The incore flux vire modification program was continued.
2.
Several repairs and modifications were made to the radiochemistry laboratory h00 channel analyzer.
Reactor Plant Performance Normal core reactivity depletion of approximately 0.8 % a K/K per 1000 MWD /MTU and 0.152 ppm boron per MWD /MTU was experienced during the period. At the current depletion rate the end of full power, unadjusted pH operat'on is estimated to be March 1, 1969 The folleving parameters were determined by means of incore instrumentation:
Zircaloy Assembly 598.8 MWt, 526.8 F Tavg, control rod group A 6 81 6/8; B, C anG D @ 87 3/8; 1038 ppm boron.
1.926 Q
=
1.78h AH
=
3.hh Minimum DNBR
=
Maximum outlet temperature =
582.0 F Secondary Plant Performance The condenser performance was as follows:
36.2 F T.T.D.
=
55.2%
Cleanliness factor
=
Feedvater heater terminal differences at 173.8 MWe and 2.62" Hg backpressure were:
No. 1:
9.0 F; No. 2:
13.3 F; No. 3:
6.0 F
, I Chemistry The main coolant boron concentration was decreased from 1170 ppm to 1036 ppm during the period to compensate for normal core burnup.
The main coolant pH averaged 5.3 during the month.
9.4x10{heaveragecoolantgrossbeta-gammaactivityandcrudlevelvere
_ pc/ml and 0.07 respectively.
The main ecolant tritium specific activity has slowly increased frca 3.61 pc/ml to h.01 pc/ml during the period. The iodine-131 specific activity was 2.1 x 10-5 pc/ml and the iodine 131/133 atomic ratio was 0.78; this indicates the absence of any detectable defe.tcl fuel in Core VII.
A representative crud sample for the month, collected on June 10, i
had the following radiochemical analyses: dpm/cg crud Cr-51 Hf-181 E"-
Fe-59 6
3 6
6 1.61 x 10
<1 x 10 1.03 x 10 1.05 x 10 Co-58 Co-60 Ag-110M,
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4 3.50 x 10 1.20 x 10 8.25 x 10 Hafnium-181 activity has deci ased to a negligible level; therefore, it will be omitted from future reports.
A main coolant gas sample collected on June 25 had the following j
1 radiochemical analysis:
ue/cc gas
)
Xe-135 Ar kl Xe-133 -,
-2 1.51 x 10 '
l.90 x lo 8.76 x 10 Health and Safety Waste disposal liquid releases totaling 30,620 gallons contained 0.017 =c of gross beta-gamma activity and 42.13 curies of tritium. Gaseous releases during this period were 2h.84 mc of gross beta-gamma activity.
+
Secondary plant water discharged was 188,8h0 gallons and contained a total of 0.004 me of gross beta-g1mma activity and 0.27 curies of tritium.
One shipment of low level radicactive waste containing 56 drums with a total activity of 209 me was made during the month of June.
In addition, one shipment of high level vaste containing a total activity of 10.256 curies was made in a single shielded LO ft3 container.
Radiation exposure doses for Yankee plar.
ersonnel, as measured by film badge, for the month of June, 1968 were as follows:
Average accumulated exposure dose 50 mrem.
l Maximum accumulated exposure dese 190 mren.
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YANKEE ATOMIC ELECTRIC COMPANY PPERATING SU?o!ARY_
MAY 1968 ELECTRICAL MONTH YEAR TO DATE Gross Generation KWH 130,504,800 414,064,800 8,124,949,400 Sta. Service (While Gen. Incl. Losses)
KWH 7,970,507 27,721,8h0 540,388,773 Net Output KWH 122,53h,293 386,342,960 7,584,560,627 Station Service 6.11 6.70 6.65 Sta. Service (While Not Gen. Incl. Losses) KWH 78,822 960,041 25,765,568 Ave. Gen. For Month (Thh.00)
KW 175,410 Ave. Gen. Running (732.68)
KW 178,120 PLANT PERFORMANCE Net Plant Efficiency 28.39 28.0h 28.38 1
Net Plant Heat Rate btu /KWH 12,021 12,171 12,025 Plant Operating Factor 96.69 62.97 72 90 Reactor Plant Availability 99.12 Th.71 82.91 NUCLEAR MONTH CORE VII TOTAL Hours Critical HRS 738.58 753.31 55,860.73 Times Scrammed 0
0 55 Burnup Core Average MWD /MTU 870.h2 870.42 Region Average MWD /hfrU A (INNER) 895.326 895.325 18,749.59 B (MIDDLE) 1032.894 1032.89-11,020.32
- C (OUTER) 681.394 681.39h 681.39 D (ZIRCALOY) 900.610 900.610 900.61
- The burnup numbers include a correction factor for flow which was not included in the previous report (Operations Report No. 89). These are the corrected numbers for May 1968.
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YANKEE ATOMIC ELECTRIC COMPANY - OPERATING
SUMMARY
JUNE 1968 ELECTRICAL MONTH YEAR TO DATE Gross Generation KWH 128,799,000 5h2,863,800 8,253,748,400 Sta. Service (While Gen. Incl. Losses)
KWH 7,9h8,871 35,670,711 548,337,644 Net Output KWH 120,850,129 507,193,089 7,705,h10,756 Station Service 6.17 6.57 6.64 Sta. Service (While Not Gen. Incl. Losses) KWH 0
960,041 25,765,568 Ave. Gen. For Month (720.00)
KW 178,889 Ave. Gen. Running (720.00)
KW 178,889 PLANT PERFORMANCE Net Plant Efficiency 28.21 28.08 28.37 Net Plant Heat Rate btu /KWH 12,098 12,154 12,029 Y
Plant Operating Factor 99.18 68.94 73.21 Reactor Plant Availability 100.00 78.88 83.09 NUCLEAR MONTH CORE VII TOTAL Hours Critical HRS 720.00 1473.31 56,580.73 Times Scrammed 0
0 55 Burnup Core Average MWD /MTU 86h.03 1734.45 Region Average MWD /MTU A (INNER) 888.h38 1783.764 19,638.03 B (MIDDLE) 1021.132 205h.026 12,0hl.h5 C (OUTER) 681.562 1362.956 1362.96 D (ZIRCALOY) 890.154 1790.764 1790.6h w
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