ML19351E301
| ML19351E301 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 08/20/1970 |
| From: | YANKEE ATOMIC ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML19351E300 | List: |
| References | |
| NUDOCS 8011280045 | |
| Download: ML19351E301 (7) | |
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'. g v4 YANKEE NUCLEAR POWER ST/ TION OPERATION REPORT NO. 115
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For the Month of July 1970 l
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g Westboro Massachusetts
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This reporti covers 'the. operation of the Yankee r.tomic Electric Company at Rowe, Massachusetts for.the month of July,197'J.
During the. period, plant: load varied between 171.2 MWe.and-
. 18h.4 MWe as the circulating water inlet temperature fluctuated between.
-63 F.and'47 F.
'During thi period the.piimary to secondary leak rate increased-
' frca 153 to 526 gallons per day. - On July 21,~ sodium hydroxide was added-to the main coolant system-for the purpose of determining individual steam generator leak rates. This:vas accomplished by.means of a t techniqueutilizingthesodiumneutrongammareactionproduct,Na{acer 2,
Results of the leak'. rate test' indicated the Nos. 1 and 3 steam generatorc-to be the prime' offenders with approximately two_ thirds of the leakage volume coming from No. 3.
The.first ship =ent~of new fuel for Core IX, consisting of 12 assemblies, was. delivered on site.
The monthly control rod exercise vas performed on July-15.
The fifth, Core VIII' vapor container air leakage surveillance
' period was teminated and the sixth such period was commenced on July 29.
Leakage during the' entire report period was normal.
Plant Abnormal Occurrences-There vere no plant abnormal. occurrences during the report period.
Plant Load Reductions 4
July h (0115-0415):
Load reductions to 140 MWe due to electrical storms.
July h -(1815-2125):
July 12-(1525-2020):
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July-18 (16h5-1752):
July 28 (1320-1650):
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- July 28 (1900-2155):
July 30-(1500-1715):
July 10'(1145-13_.<:
Load; reduction to 135 MWe for turbine throttle _ valve test.
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J Plant Shutdowns t
7-There were no plant shutdowns during the-report period.
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' Plant Maintenance
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- The following is -a list of pertinent. plant maintenance items performed by the-plant. staff during the month of July,-1970.
-1.
The,No.13. charging pump was repacked, and-one refurbished plunger
.vas installed.
.2.
.The upper flange gasket for No. 1 feedvater heater level controller
- vas replaced. The gauge' glass-for this heater was also replaced.
Reactor Plant Performance The following parameters were determined by means of incore instrumentation:
569 5 MWt; 519.8 F Tavg; Control Rod Groups'A,B,C and D @ 90 ;
.0 ppm boron.
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= 1.9 q
F
= 2.0 g
Minimum DNBR 3.7
=
584.6oF.
-Maximum Outlet _ Temperature
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Secondary Plant Performance
-Feedvater heater terminal differences were as follows:
No. 1. = 5.59 F-No.'2 10.56 F No. 3 5.66 F
=
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The Condenser performance was as follows:
- 173.0 MWe; 2.h0" Hg. B'.P.;
579.0 MWt; 63.3 F C.W. in; TTD = 21.85 F;.
cleanliness factor = 76.9h%.
Chemistry
.7
.On. July 1 and.2, a 70,000 gallon dilution of the main coolant system. reduced the boron concentration from 119 ppm to 10.5 ppm, and anion j
exchange further. reduced the boron concentration to l.98 ppm.*
' On' July 21, sodium hydroxide was added to the main coolant
- system as'a primary to secondary leak tracer. On July 22, a mixed bed. ion exchanger was placed in service to remove-the sodium. Concurrently. ammonia
. was :added' to _the syste= to. saturate the mixed bed and to maintain the i
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elevated pH caused by:the sodium..The ammonia concentration was maintained j
.at an average off10.3 ppm throughout the balance of the report period.
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During the month of July the main coolant pH varied from a lov
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of 5.h9 under borated conditions, to a high of 9 9h due to boron dilution with subsequent addition of sodium hydroxide and ammonium hydroxide.
The main coolant average gross beta-gamma activity was 6.72 x 10' ue/ml except during the sodium test period when a maximum of 6.97 x 10-1 ue/ml was noted. The coolant crud level averaged 0.0h ppm during the report period.
-1 The main coolant tritium concentration was decreased from 9.80 x 10 ue/ml to 1.39 x 10-1 ue/ml by the July 1-2 70,000 gallon dilution, followed by a buildup to 1.53 ue/ml at the end of *.he period.
-5 The average iodine-131 specific activity was 2.75 x 10 ue/ml and the iodine 131/133 atomic ratio was 0.51 indicating the absence of detectable fuel defects.
A representative crud sample for the month, collected on July 8, had the following radiochemical analyses: dpm/cg crud Cr-51 Mn-Sh Fe-59 I
6 1.38 x 10 1.78 x 10 3.08 x 10 Co-58 Co-60 Ag-110M I
6 1.kk x 10 2.73 x 10 2.78 x 106
,O' A main coolant gas sample for the month, collected on July 28,
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had the following radiochemical analyses: uc/cc gas i./
Xe-133 Xe-135 Ar-h1
-3
-3
-1 h.6h x 10 8.31 x 10 8.87 x 10 Health and Safety One shipment of 58 drums of low level radioactive vaate, containing a total activity of 7h.6 me, was made durirg the period.
Waste disposal liquid releases totalled 105,560 gallons containing 0.065 me of gross beta-gamma activity and 173.80 curies of tritium. Gaseous releases during a period totalled h.659 curies of gross beta-gamma activity.
Secondary water discharged totalled 262,695 gallons containing 2.758 cc of gross beta-ga=ca activity and 33.8 curies of tritium.
Radiation exposure doses for Yankee plant personnel, as measured by film badge, for the month of July,1970 were as follows:
Average accumulated exposure dose:
69 mrem Maximum accumulated exposure dose:
260 crem Operations
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Attached is a su= mary of plant operating statistics and a plot
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of daily average load for the month of July, 1970.
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YANKEE ATOMIC ELECTRIC COMPANv ' OPERATINJ
SUMMARY
July 1970 ELECTRICAL MONTH YEAR To DATE Gross Generation KWH 131,544,200 858,743,600 11,074,402,100 Sta. Service (While Gen. Incl. Losses)
KWH 8,044,239 51,205,355 721,210,219 Net Output KWH 123,499,961 807,538,245 10,353,191,881 Stat!an Service 6.12 5.96 6.51 Sta. Service (While Not Gen. Incl. Losses) KWH 0
1,538,483 30,446,412 h
Ave. Gen. For Month (744)
KW 176,807 Ave. Gen. Running (744)
KW 176,807 PLANT PERFDRMANCE Net Plant Efficiency 28.66 29.44 28.49 Net Plant Heat Rate btu /KWH 11,908 11,592 11,979 i
Plant Capacity Factor 96.5h 89.88 75.63 7
Reactor Plant Availability 100.00 94.56 84.50 NUCLEAR MONTH CORE VIII TOTAL Hours Critical HRS 744 7,238.42 73,058.20 Times Scrammed 4
61 Burnup Core Average MWD /MI'U 864.25 8,261.45 Region Average MWD /MTU A (INNER) 860.37 7,668.54 27,599.44 B (MIDDLE) 981.06 9,'55.76 21,491.82 C (OUTER) 747.60 7,107.75 7,107.75 D (ZIRCALOY)
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REGION ENRICHMEN T
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