ML19351E058

Operation Rept 95 for Nov 1968

ML19351E058
Person / Time
Site:	Yankee Rowe
Issue date:	01/02/1969
From:	YANKEE ATOMIC ELECTRIC CO.
To:
Shared Package
ML19351E055	List: ML19351E053 ML19351E058
References
NUDOCS 8011250546
Download: ML19351E058 (8)

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YANKEE NUCLEAR PCWER STATION OPERATION REPORT NO. 9$

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T 11c report coverc the cperation of the Yankee Atomic Electric Company plant at Rowe, Maccachusett a for the month of November,1968.

I 4t the bebinning of the period plant load was 18L MWe.

On Hovember 8 at I

lohh hours, a ccheduled plant chutdown and primary sycter ecoldown commenced.

This maintenance cutage was concluded on November 15 Plant load during the remainder of the period was 187 MWe.

Prior to plant cooldown control red drop tects were performed on celected groupa B and D rods; no abnormal conditicn wac detected during these testa.

In addition, control rod No. 17 was exerciced thrcugh full travel three times.

The rod performed nonnally except that voltage readings on the 90 " coil indicated i

that the rod did not withdraw beycud 87".

This is the came ancmaly that has been experienced du"ing routine coatrol rod exercisec.

The Ho. L main coolant pump was removed from its volute during the main-tenance outage. Following pump dicassembly for replacing the thermal barrier cacket, conciderable abrasion was cbcerved en the thrust and bottom chceo which necessitated their replacement, j

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Additional major maintenance included removal of the reactor head missile i

chield to allow installaticn of a refurbished indicating coil stack for No. 5 control rod and to permit the placement of cix air flow ducts for improving cooling air circulation in the coil atack area.

In addition, the No. 1 feed-water nanway and ceal diaphram were removed and an internal channel head increation wac performed; ceveral broken boltc in Se channel head division plate were replaced.

At 1109 hours0.0128 days <br />0.308 hours <br />0.00183 weeks <br />4.219745e-4 months <br /> cn November 15, the generator was phaced on line.

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plant trip occurred at lllL hourc with plant 1 cad at approxima:tely 18 MWe.

Since the boiler feed pump did not auto trip and it vac confirmed subsequently that the permiccive circuito had not actunted at the time of the trip, it is most probable that a reactor ceram precipitated the plant trip.

The reactor ceram could have resulted from either an intermediate range high startup rate or a high power level, exceeding 35%, spurious signal. The reactor was brought critical and the generator vac phaced on line at 12h7 hcurc without further difficulty.

l A representative from the International Atcmic Energy Agency removed the seals from the reactor head miccile shield to permit removal of this equipment during the maintenance outage.

Centrol rod groupa B, C and D vere moved cut one step to 89 2/8 as part of the rod step wear program.

On November 16 at 1215 hours0.0141 days <br />0.338 hours <br />0.00201 weeks <br />4.623075e-4 months <br /> plant load vac reduced to 165 MWe ta isolate the No. 1 feedwater heater which had developed a manway diaphram leak; following heater isolation, lead was increased to 183 MWe.

Manvay repairs were effected on UcVember 18 and the heater vac returned to service at 1600 hours0.0185 days <br />0.444 hours <br />0.00265 weeks <br />6.088e-4 months <br />.

On November 1 at 2355 hours0.0273 days <br />0.654 hours <br />0.00389 weeks <br />8.960775e-4 months <br />, plant load was reduced to lh5 MWe due to electrical storms in the area; full load was restored on November 2 at 0537 hours0.00622 days <br />0.149 hours <br />8.878968e-4 weeks <br />2.043285e-4 months <br />.

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The fifth Core VII air (harge to the vapor container vac made on Hovember 18 and 19 Only normal air leakage frcm the containment vaa i

experienced dt. ring the previouc curveillance pericd.

Plant Shutdowns Shutdevn No. 95-7-8 11/8/66 - 11/15/68, scheduled cold plant chutdown; i

repair 30. b M.C. pump thermal barrier leak and other maintenance. Shutdown duration:

160 hour0.00185 days <br />0.0444 hours <br />2.645503e-4 weeks <br />6.088e-5 months <br />, 25 mir.utes.

Plant Maintenance The following is a list of pertinent maintenance items performed by the plant staff during the month of November, 1968.

1.

Oil was cleaned from the No. 2 boiler feed pump motor; bearings were checked and new felt oil ceala were installed.

2.

New internalc vere inctalled in the bleed line variable orifice valve.

3.

New split lantern rings were installed in two shutdown cooling valves; valve stem le.koffo were relocated.

4.

Packing rings were replaced in the No. 1 charging pump.

5 Packing van added to the No'c 1 and 2 safety injection pumps.

6.

31ots were cleaned and the exciter commutator was stoned.

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Fabrication of lead shields was started for fourteen addition control rod drive housings.

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8.

Overhaul of the No. 3 cervice water pump ia in progrecs; two l

cections of the pump shaft were cent off site to be built up in vorn areas.

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Instrunentation and Control The following is a list of pertinent instrumentation and control maintenance perforued by the plant staff during the month of November, 1968.

1.

Instrumentrtion recalibration during the period included: main coolant narrow range temperature channels, safety injection flow transmitter, steam generator Ho's 2, 3 and h narrev range level transmitter and No.

h steam generator vide range level transmitter.

2.

Prior to the plant cooldown, vibration readings were taken on the four main coolant pumpc.

3.

Work continued on modifications to the in-core flux vire system.

Secondary Plant Performance Repairs to #1 feedvater heater resulted in decreasing the terminal difference by 7.00F and 1." creasing the plant output by 2.1 MWe.

i Feedvater heater terminal differences were as follows:

0 No. 1 = 5.0 F No. 2 = 12.0 F No. 3=59F i

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, l The condenser perfermance was au follova :

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166.8 IMe ; 1.33" Hg B.P.; 597.0 MWt; hh.6 F 0.W. in T.T.D. = 20.8 F, cleanlinsac tactor = 99 6%

Chemintry The main coolant boron ecncentraticn was decreased frca 513 ppm to 377 ppm during the period to ecmpensate for normal core depletion.

Following the reactor ahutdevn on November 8, the boron concentration vac increuced to 13h2 ppm and then l

diluted for startup. The average main ecolant pH was 5.h.

1 The main coolar a tritium concentration decreased from h.04 ue/ml at the j

start of the period to 1.07 ue/mi after startup because of the large amounts l

of water used for boration and dilution. The concentraticn had clevly increased to 1.96 uc/ml by the end of the period.

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The average main ecolant groca beta-gem;u upecific activity vna 7.7x10 2 ue/ml. The crud level which averaged 0.0h ppm before shutdown increaced to 5 35 ppm at startup and slowly decreased to 0.06 ppm by the end of the month.

The iodine - 131 opecific activity averaged 2.8x10-5 ue/ml; the lodine 1

131/133 atemic ratio averaged 0 91.

A representative crud cample for the menth, collected on November 27, had the following radiochemical analyscc:

drm/mg crud l

Cr-51 Mn-5h, Fe-59 i

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5 03x10 1.02x10 8.85x10 i

Co Co Ag-110M U

4 8.Shx10 3.50x10 7.66x10 A main coolant gas asnple collected on November 25 had the follcwing radicchemical analyses :

ue/cc gaa l

Xe-133 Xe-135 Ar 41 6.0Sx10-8.7hx10-3 2.87x10-1 Health and Safety Wacte disposal liquid releacen totaling 61,270 gallona contained 0.053 me of gross beta-gamma activity and 228.6 curies of tritium. Gasecus releases during this period were 106.7 me of groso beta-gamma activity. Secondary plant water discharged was 301,675 gallons and ccntained 0.011 me of greco beta-gamma activity and 3.8 curies of tritium.

In addition, 1 9 curies of tritium in vapor i

form vere purged frcm the vapor container during the plant shutdown period.

One shipment of low level radioactive vaste vac made during the period. This ohipnent consisted of 51 druma containing a total activity cf 190.h me.

Representatives of the Huclear Energy Liability Insurance Association made I

their cemi annual inspection of the site.

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Radiation expecure doses for Yankee personnel and liEPSCo. personnel as measured by film badge, for the mcnth of Ilovember,1968 vere as follows:

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Yankee Plant Personnel l

Average accumulated expecure dose:

294 mre=

Maximum accumulated exposure doce:

1094 mrem liEP3Co. Personnel Average accumulated exposure dose:

3h5 mrem Maximum accumulated exposure dose:

62k mres Operations Attaened is a su =ary of plant operating statistics and a plot of daily average load for the month of Ilovember,1968.

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9 YANKEE ATOMIC ELECTRIC COMPANY - OPERATINC

SUMMARY

November 1968 ELECTRICAL MONTH YEAR TO DATE Gross Generation KWH 103,257,000 1,153,952,20e 8,864,836,800 Sta. Service (While Gen. Incl. Losses)

KWH 6,136,732 73,664,328 586,331,261 Net Output KWH 97,120,268 1,080,287,872 8,278,505,539 Station Service 5 9h 6.38 6.61 Sta. Service (While Not Gen. Incl. Losses) KWH 306,892 1,h78,123 1,478,123 O

Ave. Gen. For Month KW IL3,413 Ave. Gen. Running KW 184,707 PLANT PERFORMANCE Net Plant Efficiency 29 20 28.09 28.35 Net Plant Heat Rate btu /KWH 11,688 12,1L9 12,038 Plant Operating Factor 76.98 79.72 74.29 w

Reactor Plant Availability 77 75 86.Sh 83.Th NUCLEAR MONTH CORE VII TOTAL Hours Critical HRS 572.95 4999.26 60,106.68 Times Scrammed 2

2 57 Burnup Core Average MWD /MTU 670.65 58h6.63 Region Average MWD /MTU A (INNER) 710.659 5964.312 23,818.58 B (MIDDLE) 779.775 68h5 034 16,832.46 C (OUTER) 5h2.1LO L697.615 h,697.62 D (ZIRCALOY) 678.975 5961.448 5,961.45

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