ML19351E082
| ML19351E082 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 10/18/1968 |
| From: | YANKEE ATOMIC ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML19351E078 | List: |
| References | |
| NUDOCS 8011250575 | |
| Download: ML19351E082 (8) | |
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YANKEE NUCLEAR PCWER STATION OPERATION REPORT NO. 93 For the month of Septenber 1968 S
Submitted by g g g7 3
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YAI KEE ATCMIC ELECTRIC COMPA?!Y
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Bos ton Massachusetta October 18, 1968
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va REGULiTORY 000EI FiECDP1 so n u s. o 57 5~
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This report covers the operation of the Yankee Atoni.c Electric l
Ccgmy plant at Rowe, Massachusetts for the month of September,1968.
i At the beginning of the period plant load was 172 FMe.
On i
Sep tenber 18 at 0630 hours0.00729 days <br />0.175 hours <br />0.00104 weeks <br />2.39715e-4 months <br />, IIo. 2 boiler feed punp notor failed during an l
increase in plant load.
The punp stator and rotor were shipped off site for l
repairs. Plant operation was continued at a reduced load of approximately i
160 &le until September 26 when the refurbished motor was installed on the Ilo. 2 pump.
Daring the period, nain condenser tubes were cleaned using hydraulically driven netal scrapers.
This technique renoved a heavy accumulation of deposits not renoved during previous cleanings with rubber plugs and/or wire brushes.
The cleaning cperation was very successful.
A decrease of approxinately 1.7" Hg in condenser back pressure resulted with an increase of 11 ffde in plant output.
Two shipnents of spent fuel containing a total of eighteen Core VII assemblies were nade on September 12 and September 21.
These fuel shipr.ents were the 2hth and 2$th in the series, bringing the nunber of elenents shipped in the ten elenent cask to 235 and the total number of elenents shipped to date to 251.
Prior to each shipnent an IAEA inspector renoved the se11s from the spc nt fuel pit loading hatch; the hatch was resealed after the fuel cask was z
renoved from the pit.
The nonthly control rod exercise was successfully completed; however, t
centrol rod I:o.17 again could not be withdrawn beyond the indicated position of 86 ?/8".
(See Ope-ation Report IIo. 92 - August 1968).
Control rod groups B, C and D were removed out of step to 88 h/8 as part of the rod step wear progran.
I!o plant rhutdowns or reactor scrans occurred during the nonth of Coptembe r, 1963.
Plant load reductions during the period were as follows:
Septenber 2 (102$-20J3)
Load reduction to lho FMe due to electrical storn area.
Sep tenber h (11$0-1315)
Load reduction to 130 FMo for nonthly turbine throttle valve test.
Septenber 11 (181h-2100)
Load reduction to lho Kde due to electrical storn in area.
September 16 (20h$) - Septenber 17 (07h0):
Load reduction to 70. IMe:
b,entenber 17 (20h5) - September 18 (06h5):
September 18 (20h5) - Septenber 19 (0933):
condenser tube cleam, ng.
September 18 (ll50-lh10):
Lead reduction to 70 M4e: plug leaking tube in condenser east water box.
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Septer.ber 25 (1920-2109):
Load reduction to lh5 FMe due to electrical storn in area.
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Plant Mainter.ance The follewing is a list of pertinent naintenance itens perforned j
Ly the plant staff during the nonth of Septm er,1768.
1.
New shaf t sleeves were installed on No. 2 vapor container booster pump, 2.
A new chaf t and new inbcard and outboard sleeves were installed in the No. boiler feed pump.
3.
Tubes in the nain condenser east and west side water boxes were cleaned using hydraulically driven scraper:
h.
No. 1 charging pug was repacked and the plungers were replace 1.
Instrz entation and Control i
i Tho fo310 wing is a list of pertinent instrunentation an ! control naintenance perfc.rned by the plant staff during the month of Septenter,1968.
1.
ilark was continued on nodificatiens to the incore flux wire cys ten.
2.
Repairs were made on the air ejector inline ra;iiation nonitor.
J.
An inproved a.c. operated versicn of the proposed control rod position prinary indication sys ten was developed.
Nac tor Plant Perfornan"e Tr< following r,araneters were determined by neans of inecre ins t runentati rn :
Zirealoy 33renbly 50? Dlt, 520.h Tavg, Control red group A @ 62 3/8; B.C.D 0 63 h/d, 723 ppa boron.
Fn 1.7)
=
1.9h F
=
h.
Mininun DMER
= h.2 Maxir:un cutlet temperature = $69.$oF Secondary Plant Perfornance Feedwater heater terrinal differences were as fcilcws:
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o No. 1: 12.3 5; No. 2: 11.1 F; No. 3:
L.5 "
The condenser perfornance was as follows:
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i Bef *_ Cleaning:
170 h ige; 4.00" Hg B.P., 598.0 !Gt, 64 F C.W.
in, 33.h F, cleanllness factor:
53%.
86 F C.W. out, T.T.D.
=
4 After Cleaning:
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181. 5 ige, ?. 30" Hg B.F., 593.0 tGt, 6h F C.W.
2n, 19 9 F, cleanlinecc factor:
97%.
0 E60F C.W. out, T.T.D.
=
Chem i s t ry 1
On September 17 an increace in steam generator chloride concentratico was detected after a portion of the main ecndenser tubec hai be m cleaned.
Steam generator blowdown was increased and after one condenser i
tube leak was plugged, blowdown waa reduced; chloride levels returned to normal va'.ue;.
l The main ecolant baron concentration was decreased frce 784 ppm to
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65B ppm during the p-riod to compensate for ncrmal core deple tion. Average main coolant pH w Conlant azerage gross beta-gnema activity and crud level were
- 5. b x 10 ~ uc/=1 mnd 0.36 ppm, respectively.
The main ecolant tritium specific activity nyernged h. 36 uc/ml durinc; the month.
Iodine-131 specific activity aus ? a x 10-5 ue/ml and the iodine 1.51/133 atomic ratio was 0.81, t
indicating the absence of detectable fuel defects.
I A representative urud cre.ple for the month, collected on September 9, haa the f ol. lowing radiochemical analyaes :
drm/cg crud Cr-Sm I'n-5 h,-
Fe-59 5
r
- 2. u x. "
- 3. 3 !. x lo" 7.13 x 10 i u' Cc 60 -
Ar-110' t.
t Ex 10 '
3.12 x 10' 6.23 x 10" A tuin ccalant pu sample collected on September 16 had the folicwirg raci em1 M1 analyses:
uc/cc gan Xe-133 Xe-135 Ar bl 1.h6 x 10 "
1.63 x 10 8.92 x 10 '~
Health and Safety Waste dispccal liquia releases totalind 15,150 gallcns contained 0.005 cc of gross beta-gn=a activity and h7.7 curies of tritiu.
Gaceous releases during thic period were 75.5 cc of gross beta-gamma actnity.
Secor.clary plant water discharged was 287,8hl gallona and con ainec a total of 0,017 =c of gress beta-gamma activity and 1.5+ curies of trit 2 um Two shipments of spent fuel ccntaining a total activity of 27 71 megacuries was made during the pericd.
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Radiation expocure doces for Yankee plant perconnel, ac i
r.;aaured by fi.1m badge, for the month of September,1968 vere au follevs:
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Average accumulated exposure doce:
gg mrem.
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Maximum accumulated exposure doce:
73h trem.
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Cperntions j
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During the period, Emergency Instruction 505 D3, Complete Losc j
of Control Air, was icsued; Emergency Instruction, 505 Bl:2, Emergency j
4 Chutdown frcm Power, was revised and reissued.
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Attached in a cu. mary of plant operating statistics and a plot of daily loal for the month of Ceptember, 1968.
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DAILY AVERAGE IDAD for September 1968 2m -
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150 -
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100 -
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50 -
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5 lo 15 20 25 30 DAYS
l YANKEE ATCMIC ELECTRIC COMPANY - OPERATING SUFS!ARY SEPTE'!BER 1968 ELECTRICAL MONTH YFAR TO DATE l
Gross Generation KWH 117,612,600 915,143,L00 8,626,028,000 Sta. Service (While Gen. Incl. Losses)
KW 7,651,340 59,291,623 571,958,556 Net Output KWH 109,961,260 855,851,777 8,054,069,444 l
l Station Service 6.51 6.L8 6.63 Sta. Service (While Not Gen. Incl. Losses) KWH 0
1,171,231 25,976,758 h
Ave. Gen. For Month (720.00)
KW 163,351 l
Ave. Gen. Running (720.00)
KW 163,351 l
PLANT PERFORMANCE l
Net Plant Efficiency 27.h3 27.89 28.3h l
Net Plant Heat Rate btu /KWH 12,h42 12,236 12,0h2 m
Plant Operating Factor 92.81 77.79 73.97 l
Reactor Plant Avaliability 100.00 85.97 d3.63 j
NUCLEAR MONTH CORE VII TOTAL
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Hours Critical HRS 720.00 3681.31 58,788.73 l
g Times Scran:med 0
0 55 Burnup Core Average MWD /MTU 808.52 h280.14 1
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Regien Average MWD /MTU i
A (INNER) 792.862 4318.705 22,172.97 i
B (MIDDLE) 939.051 5022.h88 15,009.91 C (OUTER) 662.679 3h30.136 3h30.14 i
D (ZIRCALOY) 820.022 h381 730 4381.73 1
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