ML19351E074
| ML19351E074 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 11/15/1968 |
| From: | YANKEE ATOMIC ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML19351E070 | List: |
| References | |
| NUDOCS 8011250563 | |
| Download: ML19351E074 (8) | |
Text
{{#Wiki_filter:_- o O D hl anm c _, _ m; Reg ~ulatory Sapi Fila Cy. W!YYiLtrfata_ / l / (-{ Y YANKEE NUCLEAR POWER STATION OPERATION REPORT NO. 9h For the nonth of /yN **277'/'- aft October 1968 j',= ' /~ .a r- ~ c., ( vs l ;
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t Submitted by YANKEE ATOMIC ELECTRIC COMPANY Boston Massachusetts November 15, 1968 J p.SUK0RY DOCE ElCD?Y s o n e s o Sy
O o This r9 port covers the operation of the Yankee Atomic Electric Ccmpany plant at Rove, Massachusetts for the month of October,1968. 1 Plant load varied between 181 MWe and 18h MWe as circulating water inlet temperature fluctuated between 65 F and Sh F. The final shipment of Core VI spent fuel accemblies was made on October 1. This shipment was the twenty-sixth in the series, bringing.the i number of elementa shipped in the ten element cask to 2hh and the total number of elements shipped to dati to 260. Vapor container air leakage was nonnal during the third Core VII surveillance period ending October 6. The forth Core VII air charge to the containment was made on October 6 and 7 to establish base conditions for the current surveillance period. Twenty-four control and chim rod sections, the spent source from Core V, a ficcion counter detector and a section from a broken source were shipped as radioactive vaste. The monthly control rod exercise and other routine tests were completed, cuecessfully. Control rod groups B, C and D vere moved out one step to 88 7/8 as part of the rod atep wear program. Following a routine test operation of the emergency diesel generator on September 24, an engine restart was attempted to check the governor control setting; the engine cranked but would not start.. Maintenance personnel _ vere called for assistance and following a recet of. all protective relays, the diesel started immediately through use of normal ctarting procedures..It is believed that the restarting difficulty vac caused by an engine trip. initiated from the alarm panel. The alar: 'unel switch must be on before. the diesel can be started and diesel start t; ut take place before.a.. time j delay relay operates to sound an alarm and close the solenoid.. fuel valve. When this relay operates,the alarn can be cancelled but the relay.nust. reset before restarting. Apparenti v, + he engine restart was attempted before the relay recet. 1 To ascertain *;ut the starting difficulty was not due to an un-discovered mechanical problem, the unit was test run every other day for two weeks. Each time, the diesel was operated under load for three hours, l ctopped and restarted. In addition, a new operating meno has been issued swnmarizing diesel startup procedures and corrective action in the event of a starting problem. No plant shutdowns or reactor cerams occurred during the month of October, 1968. Plant losd reductionc during the period vere as follova: October 2 (11h0-1315) Lead reduction to 135 MWe; turbine throttle valve monthly test. October h (1130-1445) Load reduction to 78 MWe; check main condenser f'or leakage. 'II, _ - _ _ ~. _ _..., _ _ - - _., _ _ _ _ _ _, _.. _,. -
o 9 - Plant Maintenunce The following is a list of pertinent maintenance itema performed by the plant staff during the month of Octcber,1968. 1. Forced air heating, filtern, exhauster and ducts were installed in the new decontrx:lination building. ) 2. Fabrication of an angle head for the underwater T. V. camera was continued, 3. A lead chield van f abricated for use while lapping a main coolant pump 1 thermal barrier gasket area. L. The No. 1 and No. 2 charging pumps were repacked; new bronze bushings were installed in the No. 2 pump. Instrumentation and Control The following 13 a list of pertinent instrumentation'and control maintenance performed by the plant staff during the month of October,1968. 1. Acuembly of a control rod position primary indication system was started. 2. Modificationa to the incore flux wire cyctem were made. 3. Apparatua for testing steam generator level instrumentation were fabricated. Reactor Plant Performance The follcwing parameters were determined by' means of incore instrumentation: 600 IGt, 526.0 Tavg, Control rod group A @ 821; B,C,D @ 8R" 565 PFM boron. 1.8 F = q 1.7 F = g Minimum DHER =35 Max mum outlet temperature = 582.5 i Secondarv P1 ant Ferformance Feedwater heater terminal differences were as follows: No. 1: 12.8 F No. 2: 11.3 F No. 3: 6.0 F
o 0 - The condesser performance wa3 as follows: 181.8 ffde; 2.28" Hg B.P. ; 598.0 Itat ;.62.h F C.W. in 19.h F, cleanliness factor: 93.2% T.T.D. = Chemistry The main coolant boron concentration.was decreased-frcm 658. ppm to 513 ppm during the period to compensate for normal core depletion. Average main cooltnt pH was 5.3 Coolant average gross beta-gamma activity and crud level were 8,5 x 10-2 uc/ml and 0.0h ppm, respectively. The main coolant tritium. specific activity averaged 4.21 ue/ml during the month. Iodine-131. specific activity was 2.3 x 10-5 ue/ml and the iodine.131/133 atomic ratio was 0.83, indicating the absence of detectable fuel defects. It representative crud sample for the month, collected on October 14, had the following radicchemical analyses: dpm/cg crud 1 Cr-51 ft-Sh Fe-59 5.95 x 10 2 59 x 10 7.16 x 105 6 5 Co-58 Co-60 Ag-110M 6 5 h.35 x 105 1.52 x 10 6.92 x 10 ti main coolant gas sample collected on October 15 had the following radiochemical analyses: ue/cc gas Xa-133 Xe-135 Ar bl 1.36 x 10-2 1.59 x 10 2 2.03 x 10-1 Health and Safety Waste dispccal liquid releases t<t.aling 32,980 gallons contained 0.018 me of 6ross beta-gamma activity and J h9.8 curies of tritium. Gaseous releases during this period were 83.6 me of gross beta-gamma activity. Secondary plant water discharged was 31],330 gallons and contained C.ook me of gross beta-gar =la activity and 3.h curies of tritium. One shipment of nine Core VI spent fuel assemblies containing 15.lh megacuries of activity was made. One high level radioactive waste shipment containing 600 curies of activity was made. Radiation exposure doses for Yankee plant personnel, as measured by film badge, for the month of October,1968 were as ollows: Average accumulated exposure dose: $3 mrem. I Maximum accumulated exposure dose: 262 crem.
o 4-C pa rat i on: Attached is a su=ary of plant operating statistics and a plot of daily average load for the month of October, 1968. i l \\ l l 1 s I t l l 4 1 l
^ {a YANK Ex ATOMIC RT ~ COMPANY DAILY AVERAGE IDAD for October 106,8 200 - ~ e E 3 g 150 - i ,<a i = h 100 - d Wa O i 50 - I l l l h h 3 10 15 20 25 30 DAYS I
YANKEE ATOMIC ELECTRIC C0!'PANY - OPERATING
SUMMARY
October 1968 ELECTPICAL MONTH YEAR TO DATE Gross Generation KWH 135,551,J10 1,050,695,200 8,761,5*,9,800 Sta. Service (While Gen. Incl. Losses) KWH 8,235,973 67,527,596 580,194,529 Net Output KWH 127,315,827 983,167,60h 8,181,385,271 Station Service 6.08 6.h3 6.62 Sta. Service (While Not Gen. Incl. Losses) KWH 0 1,171,231 25,976,758 Ave. Gen. For Month (745.00) KW 181,9h9 Ave. Gen. Running (745.00) KW 181,949 ~ PLANT PERFORMANCE Net Plant Efficiency 28.66 27.99 28.34 Net Plant Heat Rate btu /KWH 11,908 12,193 12,0h2 Plant Operating Factor 99.38 79.98 Th.26 [ Reactor Plant Availability 100.00 87.h0 83.31 NUCLEAR MONTH CORE VII TOTAL Hours Critical HRS Th5.00 hh26.31 59,533 73 Times Scra:::med 0 0 55 Burnup Core Average MWD /MTU 895.84 5175 98 Region Average MWD /M'IU A (INNER) 934.948 5253.653 23,107.92 B (MIDDLE) 10h2 771 6065.259 16,052.68 C (OUTER) 725 339 h155.475 4155.h8 D (ZIRCALOY) 900 743 5282.k73 5282.47
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