ML19351E246
| ML19351E246 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 11/19/1971 |
| From: | YANKEE ATOMIC ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML19351E245 | List: |
| References | |
| NUDOCS 8011260343 | |
| Download: ML19351E246 (8) | |
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OPERATION REPORT NO. 130 i
For the Month of October 1971 i
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l YANKEE ATOMIC ELECTRIC COMPANY Westboro Massachusetts l
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l This report cavers the operation of the Yankee Atomic Electric Company at Rowe, Massachusetts, for the month of October,1971.
At the start of the period, plant load was 179.9 Mke.
One j
scheduled plant shutdown occurred during the period for the purpose of effecting repairs to the No. 1 steam generator. The turbine generator was separated from the high line or. October 29 at 2202 hours0.0255 days <br />0.612 hours <br />0.00364 weeks <br />8.37861e-4 months <br /> and the plant was placed in a cold shutdown condition which continued through the remainder of the report period. During the period October 1 - 29 the primary to secondary leak rate had increased from 102 to 120 gallons per day.
On October 31, the manway covers were removed and the seal welds were cut on the diaphragms for the No. 1 steam generator primary side manways. The diaphragms were removed and one leaking tube on the inlet side was identified for plugging. A tube integrity test utilizing an eddy current probe technique revealed seven additional tubes to have localised defect penetrations of greater than 50 percent of the tube wall 1
thickness. All eight tubes, the one known leaker and the seven potential leakers, were plugged utilizing explosive welding 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 to 16 r/hr respectively.
9 At the end of the report period the plant was shutdown and repairs to No. 1 steam generator were in progress.
An accident emergency drill was performed on October 27 involving actual evacuation of the plant by all non-operating personnel. A review of the drill was conducted by the Plant Operations Review Committee.
Tne seventh, Core IX vapor container air leakage surveillance period was terminated October 29, coincident with reactor shutdown.
Leakage i
during the period was nonnal.
Plant Abnornal Occuri ces l
There were no plant abnormal occurrences during the report period.
Plant Load Reductions October 6 (11hh-1219):
Plant load reduction to 172 MWe for turbine i
control valve exercising.
Getober 6 (lh35-1700):
Plant load reduction to lho MWe due to an j
electrimil storm.
October 13 (llh6-122h):
Plant load reduction to 173 MWe for turbine control valve exercising.
I October 20 (llh5-1215):
Plant load reduction to 108 MWe for turbine control valve exercising.
4 October 27 (1145-1215): Plant load reduction to 170 MWe for turbine control valve exercising.
Plant Shutdowns Shutdown No. 119-10-71:
10-29-71, commenced scheduled plant shutdown for No. 1 steam generator leak repairs. Outage l
still current at end of report period.
l Plant Maintenance l
The following is a list of pertinent maintenance items yerformed by the plant staff during the month of October, 1971.
i 1.
The No. 3 charging pump was repacked.
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2.
The turbine generator exciter commutator was stoned.
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A discharge valve seat in the No.1 charging pump was replaced.
l Instrumentation and Control The following is a list of pertinent instrumentation and control j
maintenance items performed by the plant staff during the month of l
October, 1971.
l 1.
The steam regulating valves for the two waste liquid holdup tanks were l
j rebuilt.
I 2.
The No. 4 neutron power level meter was replaced.
l 3
The cam followers on the vide range and narrow range steam generator leve,1 receivers were replaced, i
l Reactor Plant Performance i
i The following parameters were determined by means of incore j
instrumentation 1
l 585.1 MWt; 523.8 F Tave; Control Rod Group A @ 90", B,C,D, @ 89 "-
5 17 9 ppm boron i
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= 2.0 gg Minimum DNER = 3.7 1
Maximum outlet temperature = 587.5 F 9
Secondary Plant Performance Feedwater heater terminal differences were as follove:
I No. 1 = 5.0 F No. 2 = 5.3 F No. 3 = 5.5 F l
The condenser performance was as follows:
I 178.6 MWe; 2.25"Hg B.P. ; 595.5 MWt ; Sh.2 F C.W. in; TTD = 29.8 F; cleanliness factor = 66.3%
Chemistry During the period October 1-29 the main coolant pH averaged 6.52.
On October 30 the main coolant was borated to a 5% shutdown concen-tration and averaged 1312 ppm with an average pH of 5.55 during the balance of the report period.
The main coolant boron concentration was reduced from 105 ppm at the start of the period to 7 ppm on October 5 to compensate for normal core depletion. Coincident with this dilution the main coolant tritium concentration decreased from 1.59 uc/ml to 1.55 x 10-1 ue/ml.
The tritium concentration thereafter increased to 1.65 ue/ml at the start of the shutdown period.
During the period of power operation, October 1-29, the average gross beta-gamma activity and crud level were 7.28 x 10-2 ue/ml and 0.0h ppm respectively. On October 31, with the plant in a cold shutdown condition the gross beta-gamma activity reached a maximum of 5.82 x 10-1 ue/ml.
During the October 1-29 period of power operation the average 9
atomic ratio averaged 1.94 iodine 131 specific activity was 1.77 x 10 h ue/ml and the iodine 131/133 A crud sample for the month collected on October 29 had the following radiochemical analyses: dpm/cg crud Cr-51 Mn-5h Fe-59 6
6 2.90 x 107 1.96 x 10 3.92 x 10 Co-58 Co-60 Ag-110M 1.69 x 107 6
3.92 x 10 6.43 x 105 I
A main coolant gas sample, collected on October 5 had the j
following radiochemical analyses: ue/cc gas Xe-133 Xe-135 Ar-kl 2.85 x 10-1 1.51 x 10-1 1.h5 Health and Safety One shipment of 58 drums of low level vaste containing 32.8 me was made during the period.
Waste disposal liquid releases totalled 85,385 gallons containing O.085 me of gross beta-gamma activity and 233.18 curies of tritium.
Gaseous releases during the period totalled 1.135 curies of gross beta-gamma activity. Secondary plant water discharged totalled h21,697 gallons containing 0.h26 =c of gross beta-gamma activity and 16.615 euries of tritium.
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i An additional release of 2.036 curies of tritium as a vapor vas discharged to the environs during the period.
Radiation exposure for Yankee plant personnel and N.E.P.S.Co.
personnel as measured by film badge, for the month c2 October,1971 vere:
Yankee Plant Personnel:
Average accumulated exposure dose:
112 mrem Maximum accumulated exposure dose:
700 mrem
- N.E.P.S.Co. Personnel:
Average accumultited exposure dose:
127 mren Maximum accumulated exposure dose:
400 mrem Operations Attached is a summary of plant operating statistics and a plot i
of daily average load for the month of October, 1971.
9 N.E.P.S.Co personnel on site during the report period.
Exposure determined from daily dosimeter readings.
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3 YANKEE ATOMIC ELECTRIC COMPANY - OPERICING SUU.ARY october 1971 ELECTRICAL MONTH YEAR To DATE Gross Generation KWH 122,Th5,200 1,29::,526,000 12,789,397,300 Sta. Service (While Gen. Incl. Losses)
KWH 7,523,696 78,610,763 826,635,788 Net Output KWH ll5,221,50h 2,214,915,237 11,962,761,512 Station Service 6.13 6.08 6.h6 Sta. Service (While Not Gen. Incl. Losses) KWH 118,100 606,983 32,895,838 Ave. Gen. For Month (Th5)
KW 164,758.7 Ave. Gen. Running (694.03)
KW 176,858.6 PLANT PERFORMANCE Net Plant Efficiency 28.1h 28.47 28.49 Net Plant Heat Rate btu /KWH 12,128 11,987 13,979 i
Plant Capacity Factor 91.62 97.48 76.86 i
Reacter Plant Availability 93.16 96.41 85.05 MONTH CORE IX TOTAL NUCLEAR Hours Critical HRS 694.03 7,998.42 82,962.82 Times Scrammed 0
3 64 Burnup Core Average M4D/MrU 821.40 9,454.74 Region Average M4D/MTU A (INNER) 839 23 9,214.38 26,418.05 B (MIDDLE) 954.43 11,086.21
.19, o26. v6 C (OUTER) 686.56 7,851.46 7,851.h6 D (ZIRCALoY)
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