ML19351E165
| ML19351E165 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 09/28/1967 |
| From: | YANKEE ATOMIC ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML19351E164 | List: |
| References | |
| NUDOCS 8011250695 | |
| Download: ML19351E165 (8) | |
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,R,Qq.ory Formal Fild CK YANKEE NUCLEAR POWER STATION OPERATIO!I REPORT NO. 80 For the month of i
AUGUST 1967 O
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YANKEEATOMICELECh'RICCOMPANY Boston Massachusetts September 28, 1967 i
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This report covers the operation of the Yankee Atomic Electric f
Company plant at Rowe, Massachusetts for the month of August,1967 At the beginning of the period the plant was operatir g at approximately 176 MWe.
Thereafter plant load varied between 170 MWe i
and 175 MWe as circulating water inlet temperature varied betwecn 500F and 650F.
On two different occasions plant load was reduced to approxbnately 80 MWe in order to perform condenser leak tests and tube plugging. The first leak test was initiated at 1150 hours0.0133 days <br />0.319 hours <br />0.0019 weeks <br />4.37575e-4 months <br /> August 14.
Slowly increasing steam generator chloride concentrations during the previous week had strongly indicated the presence of a tube leak. As a result of the leak test five tubes were plugged in the West condenser water boxes. Two were positively identified as leakers and three were considered probable leakers. At 1519 hours0.0176 days <br />0.422 hours <br />0.00251 weeks <br />5.779795e-4 months <br /> O
the condenser was returned to service and plant load increased to approximately 145 MWe while awaiting completion of repairs being performed concurrently on No. 2 circulating water pump. By 1758 hours0.0203 days <br />0.488 hours <br />0.00291 weeks <br />6.68919e-4 months <br /> plant load was returned to 172 MWe.
Subsequent to the nain condenser tube plugging accomplished on August 14 steam generator chloride concentrations decreased to normal levels. However, a slow increase was again noted approximately five days later. At 1100 hours0.0127 days <br />0.306 hours <br />0.00182 weeks <br />4.1855e-4 months <br /> August 23 plant load was reduced to 75 MWe in order to perform another leak test on the condenser. As a result of this test three tubes were l'ugged, again in the West water boxes. One tube was positively identified as a leaker and two others as probable lenkers.
By 1630 houre the condenser had been closed out and plant load was returned to 600 MWt.
At 1618 hours0.0187 days <br />0.449 hours <br />0.00268 weeks <br />6.15649e-4 months <br /> August 10 the 7-126 115 KV line was opened at the Harriman end due to a failure at the Harriman Station. Plant
. load was reduced to h50 MWt and varioua operational procedures and precautions consistent with single 115 KV line plant operation were implemented.
By 18k3 hours the Z-126 line was returned to nonnal service and shortly thereafter a plant leal of 600 MWt was attained.
On July 9 plant load vs3 reduced to 135 MWe for approxi-mately one hour to conduct the monthly exercise of the turbine throttle and control valves. All vslves functioned normally.
The monthly control rod exer:ise was conducted on August 30.
All rods functioned nonnally. On Audaat 31 rod groups B, C, and D vere banked at 89-2/8 $nches. This was the seventh st ) of the Core VI maximum withdrawal limitation program for distribution of guide block wear.
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. h The fourth Core VI air charge to the vapol entainer was completed August 2 when the total weight of dry air in the vapor container was approximately 66,000 pounds ( % 1.5 psig). The vapor I
container air leakage rate was nonmal thrcughout the remainder of the reporting period.
No plant shutdowns or reactor scrams occurred during the month of August.
Plant Maintenance The following is a list of major plant maintenance items performed by the plant staff for the month of August 1967:
1.
No. 2 circulating water pump upper motor tearing and bearing race vere replaced. The race had been found to be cracked and the bearing rollers
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badly chipped.
2.
Carbon seal rings were replaced in No. 1 and No. 3 charging pumps.
3.
A leaking drain valve was replaced in the charging pump suction line.
4.
Radiation shields for the reactor head pressure hcusings were fabricated for use during the next refueling shutdown.
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No. 2 battery 2harger c;mmutator was machined.
6.
A turbine spindle turning fixture was fabricated.
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7 The thrust bsaring on No. 1 service water pump was replaced.
8.
The primary vent itsch was inspected and found to be free of corecsion.
Instrumentation and Control The following is a list of the majcr instrumentation and control maintenance items performed by the plant staff during the month of August 1967:
l 1.
Two defective BF3 nuclear instrument chambers were disassembled and inspected.
2.
A low pressure gland steam supply pressure gage was installed at the main control board.
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Leak repairs were affected on the charging pump flow transmitter line.
Reactor Plant Performance Core reactivity depletion was normal at approximately 0.70% A K/K per 1000 MWtD/MTU.
The following parameters were determined by means of incore instrumentation at 599.2 MWt, 526.hoF iavg, 380 ppm boron, control rod groups B, C, & D at 88 7/8 and Group A at 81 0/8; 2.32 Fq
=
1.98 FAH
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Minimum DNER 3.2
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589.SoF Maximum Outlet Temperature
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O During the monthly control rod exercises position i
indicating coil stack voltage plots had indicated th :t control rod No. 8 was low by five steps. On August 31, while performing the seventh step of the Core V1 maximum withdrawal limitation progrmn, control rod No. 8 position was brought into conformance with its associated rod group.
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Secondary Plant Performance Feedwater heater terminal difference at 170 MWe, 3.5" Hg backpressure and 526.0 F Tave:
0
- 1 - 5.9 F
- 2 - 16.hCF
- 3 - 9.60 F 0
Condenser terminal difference:
35 9 F O
Chemistry During the period the main coolant boron concentration decreased from hh5 ppm to 30h ppm. The average main ecclant specific activity vus h.83 x 10-2 ue/ml and the average sys tem crud level was 0.17 pp. The main coolant iodine-131 specific activity was 1.79 x 10-5 ue/ml; the I-131/I-133 atomic ratio was 0.65 The average main coolant tritium specific activity was 1.36 mc/ml.
A representative crud sample for the month collect 2d on August 16, had the following radiochemical analysee:
dpm/mg crud Cr-51 Hf-181 Mn-5h 6
6 2.25 x 10 1.23 x 105 1.58 x 10 Fe-59 Co-58 co-60 Ag-110m 6
2.85 x 106 3.h5 x 1Ch 1 51 x 10 1.06 x 107
h-l A rsin ecolant gas sample collected on August 1h had the following radiochemical analyses: uc/cc gas Xe-133 Xe-135 Ar 41 4.78 x 10-3 7.37 x 10 h 2.26 x 10 2 Health and Safety Three shipments of low level radioactive vaste were made during th* period comprised of 169 drums containing a total j
nativity of 1.31 curies.
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One shipment of high level radioactive vaste was made comprised of fourteen drums with a total activity of 535 me.
O During August the waste disposal liquid releases totaled 18h,000 gallons containing 0.57h me of gross beta-gamma activity and 93.676 curies of tritium. Gaseous vaste releases during the 4
same period totaled 16.89 me or gross beta-gamma activity.
Secondary plant water discharged during the period consisted of 239,000 gallons containing a total ~of 7.5 ue of gross beta-gamma activity and 0.329 curies of tritium.
4 Radiation exposure doses for Yankee plant personnel as measured by film badge for the month of August 1967 vere:
Average accumulated exposure dase 62 mrem Maximum accumulated expccure dose 347 mrem Operations Attached is a su=ary of plant operating statistics and a plot of daily average load for the month of August 1967.
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YANKEE ATOMIC ELiiCTRIC COMPANY -- OPERATING SUl#ERY AUGUST 1967 EIJCTRICAL 10 NTH YELR TO D&TE Gross, Generation WH 128,516,500 8h3,646,900 7,206,107,h00 Sta. Service (While Gen. Incl. Losses)
WH 8,047,11h 51,082,575 481,105,397 Net Output WH 120,469,386 792,564,325 6,725,002,003 Station Service 5
6.26 6.05 6.68 Sta. Service (While Not Gen. Incl. Iosses)
WH 0
933,217 2h,728,684 Ave. Gen. For Month (Thh.00)
W 172,737 Ave. Gen. Running (744.00)
W 172,737 PIANT PEHFORMANCE Net Plant. Efficiency 27.27 28.31 28.h4 Net Plant Heat Rate Bru/WH 1.2515 12055 12000 Plant Operating Factor 98.98 80.03 72.26 Reactor Plant Availability 100.00 88.01 82 58 8
{IUCLEAR
)ONTH CORE VI TOTAL Hours Critical HRS 744 6h73.05 50,198.73 Times Scra -ad 0
2 Sh Burnup Core Average PWD/ E 886.1h 7096.00 Region Average ND/MPU A (INNER) 876.741 7121.151 23,893.65 B (MIDDLE) 1058.103 8h95.517 16,170.80 C (OtTTER) 715.073 5692.482 5692.48 G
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