ML19351E162
| ML19351E162 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 10/30/1967 |
| From: | YANKEE ATOMIC ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML19351E161 | List: |
| References | |
| NUDOCS 8011250691 | |
| Download: ML19351E162 (9) | |
Text
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YANKEE NUCLFAR POWER STATION I
OPERATION REP 0la MO. 81 f
For the month of l
SEPTrAPElt 1967 l
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O Submitted by YANKEE ATOMIC ELECTRIC COMPA!PI oston Massachusetts October 30, 1967 i
soneso64!
4 Ttic report covers the operation of the Yankee Atonic Electric Company plant at Fowe, Mansachusetts for t he ncnth of reptember, 1967 Plant.osd var ied between :73 We ant 176 Vie t hrcugt-cut the r epc ri.i ng ciret]at inE vr.ter inlet tenI.crctur e varied betwt.en 51'per cd a F and 60 F.
At the beginning of the reportits period slowly increasing stean generntor chloride conce ntrationn again I
indicated the presence of a nain condenser tube leak. At 1205 houra September 11 plar.t load van reduced to 75 FNe for approxinately three houru in,rder
',o conduct leak tests on the condenser. Ac a result of the test tbree leaking tuber in the west condenser vater boxen were plugged.
Tuo tubes were closely adjacent t o the air renon.1 line und one was near the bottom of the tube bundle. At 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> the condenser O
was returned to ser tice and plant load increase to 600 int van i
initiated.
At tae begtnning of the report.ng period preparationc v are nade for cleanin g and inspection of the atent fuel pit.
(h Septemaer 12 four :ontrol rad absorber ae:tions and four follover sections ver? renoved from the spent fuel pit and landed into the control rod chippind cask which was temporarily ntored under the vapor container. Additional tools and niucallaneous components were renoved from the pit and also P 'c ad in tem aorary storage, prinarily In the control area I
utorage building.
Upan renoval of all extraneous equipment spent fuel pi t dewate r'.nz and nrelimira:--r cleaning and decon-tanination efforta vere initiated. Tne latter included nanual acrubbing and u*.iliuation of a hyd: a-brush.
Initial inspection of the valls disclo3?d same blistering of the phenalic coating. A detailed inspection conducted in the presence of tne narr.lacturers rapresentative revealed that the blister.3 did not penetrate all 1tyers of the coating and consequertly were not letriwntal to the utilization of the spent flel p:t.
At the end of tne reparting pericd both tluminum fuel cu.t ge ra:ka had oeen 1em3ved for decontsmination i
.I and cleuning and dewatering of the pis was continuing.
On Ceptember 6 plsnt lo-id was reduced to lh0 MWe.
for approximately one ind one-half hours to exercise the turbine throttle and control valves. All valves functioned normally.
On September 27 the monthly control rad exercise ans conducted. All contral rods operated normally.
[
The vapor container air leakade rate was normal throughout the reporting period.
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No plant shutdowns or reactor scrams occurred during the month of September.
Plant Maintenance The following is a list of major plant naintennace items performed by the plant staff for the month of September, 1967:
1.
Three plungers were replaced in No. 1 charging pung and 3eal rinds were replaced in No. 1 and No. 3 enarging pumps.
2.
The monorail tracx wan extended frou the ahop into the new decontamination building and the hoist feed rail van ins talled.
,~x 3.
The interior of the new decontamination building was
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painted.
4.
Manger rods on the main steam line under the safety valves were modified.
5.
Additions to the heat tracing on the non-return valve pistform were installed.
k 6.
A short portion of erroded vent line was replaced on No. 3 feedwater heater.
Instrumentation and Control The following is a list af major instrumentation and control maintenance items performed by the plant staff during the month of September 1967:
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Extensive rewiring and repsir of the flux wire drive system was accomplished.
2.
Cables to the incinerator radiation stack maniter were replaced.
3.
Repairs to the pneumatic operator for the heater drain receiver control valve were effected.
h.
Modifications to the primary stack radiation monitorind system to facilitate maintenance and calibration vere completed.
Iteactor Plant Performance Core reactivity depletion was normal at approximately 0.70 % A K/K per 1000 MWtD/MTU.
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The following parameters were determined by mean:, of I
incore instrumentation at 599.0 MWt, 527 2 F Tavg,252 ppa boron, control rod groups B,C, and D at 89 2/8 and group A at 86 2/8; 2.35 Fq
=
F 2.03 AH
=
i 3.13 Minimum DNBR
=
591.7 F Maximum outlet temperature
=
Secondary Plant Performance Feedwater heater terminal difference ac L72 MWe, 3.2" Hg backpressure and 525.6 F Tavg:
0
- 1 5.8 F
- 2 16.h F
- 3 10.2 F Condenser terminal difference at 170 MWe and 3.5" Hg backpressure was 35.9 F.
l Chemistry At the beginning of the reoorting period the increasing steam generator chloride concentrations ultin:ately necessitated the plugging of three condenser tubes on September 11.
Prict to the tube plugging the average chloride concentration had increased to 0.31 ppm and the maximum in any one steam generate-to 0.35 ppm After the plugging chloride concentraticns O
returned to normal values and remained so throughout the report period.
Puring the period the main coolant baron concentration decreased from 304 ppm to 167 ppg. The average main ecclant specific activity was 6.18 x 10~
mc/nl and the average system crud level was 0.11 ppm.
The main coolant iodine-131 specific activity was 1 99 x 10-5 ue/ml; the iodine ~131/133 atcmic ratio was 0.73.
The average main coolant tritium specific activity was 2.40 uc/ml.
A representative crud sample for the month, collected on September 15, had the following radiochemical analyses:
i dpm/mg crud Cr-51 Hf-181 Mn-Sh
- 9 6
5 6
6 h.11 x 10 1.35 x 10 1.69 x 10 1.98 x 10 Co-58 Co-60 AF-110m 6
g g
9 36 x 10 2.21 x 10 1.99 x 10 A
h-A main coolant gas sample collected on September 6 had l
the following radiochemical analyses: ue/cc gas Xe-133 Xe-135
_p~
Ar-41,p-3 7 9 x 10 1.09 x 10 8.77 x 0 llealth and Safety On September 5 it was discovered that the hinge pins on the locked loading door of the clean area incinerator had been removed. In this condition the door was capable of being opened wide enough for improper usage. A radiation survey of the waste material in the incinerator showed na radiaticn levels above background, 0.4 - 0.5 mr/hr, and the incinerator vac returned to normal service. However, inasmuch as this was e violation of the administrative procedures established subsequent f~N to a prior improper usage of the incinerecor, previously reported iJ in Operation Report No. 78 of June 1967, it was deemed advisable to conduct a more thorough rudiation survey of the vaa te material in the incinerator. On September-ll all waste was remeved and transferred to a low background' area.
Radiatica levels approximately one inch above the vaste material at this time were 0.1 - 0.25 mr/hr including a background of 0.05 mr/hr.
Consequently the contents of the incinerator, eight 55 ballon drums consisting of ti.ree drums of
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items were positively identified as having criginated in the ash and five drums of solids, were separated and inspected. Several contrclied area.
No single item showed radia'!:n levels great r than that found by the general radiation survey before rapurst ion.
A conservative evaluation of the release based on th-mass an.1 activity of the combustible material and the related values of ash content and air-fuel ration resulted in an estinated releace averaged over the possible period of the release, June 7 - Septembar 11,1967, cf 0.19 fiPC for an unrestricted area,1 x 10-10 uc/ml. A separate analysia barcd
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on meteorological diffusion evaluation methods resulted in an estimated release averaged over the same period of 0.05 MPC for an unrestricted area and 0.0001 MPC when averaged over the year.
The t tal release was e11 mated to be no greater than 12.25 uc of particulate activity con-taining Co60 and Mn5h as the principal icotopes.
At the end of the reporting period an investigation vas still in pr:gress ta determine the circumstances by which the radicactive vaste was burned in the clean area incinerator including the transpcrt, *ime of occurrence, and personnel involved. 'The incinerator was decontaminated and the hinge pins welded to preclude unauthorized usage. Until such time as the investigation is concluded the use of the clean area incinerator has been discontinued. No personnel vere contaminated or received any abnormal radiation exposures as a consequence of this release.
One shipment of low level radicactive vaste was made during the period comprised of sixty-one drums containing a activity of 312.6 uc.
. During September the waste disposat liquid releases 3
totaled 303,000 gallons containing 3.01 me of gross beta-gamma activity and 125.841 curien of tritium. Gaseous waste releases during the stee period totaled '('(.5h me of gross beta-gumma activity.
Secondary plant water discharged during the period consisted of 295,000 gallons containing a total of 11.58 uc of gross beta-gamma activity and 0.213 curies of tritium.
Radiation exposure.dones for Yankee plant personnel as measured by film badge.for. the month of September 1967 were:
A<ernge accumulated exposure dose 58 mrem Maximum accumulated exposure dose 2h0 mrem
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Q,i Operations Attached is a summary of plant operating statistics and a plot of daily average load for the month of September 1967.
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9 YAFE ATOMIC ELEI:TRIC COMPANY -- OPERATING SU)0RRY SEMD:EER 1967 10NTil 7 EAR TO DATK EIR:TRICAL Gross Generation WH 125,h6, W 9( 3,'
,700 7,E 1,35';,?00 Sta. Service (While Gen. In::1. Losses)
NH 7,73h, c,
3,.. n, M.-
- , J.5,9 L o, p A WH 117,511,925 009,976,253 6,6L2,L13,931 Net Output Station Service 5
6.26 6.03 6.67 Sta. Servico (While Not Gen. Incl. Inns". :)
WH 933,217
- .,728,cSh Ave. Gen. For )tanth (7 0.000)
W 173.0;L Ave. Gen. Running (720.t00)
W 17',9#L PIANT PEEFORMANCE Net Plant. Efficiency 27.3h 28.18 29.h2 Net Plant Heat Rate btu /WH 12,'463 12,111 12,008 Plant Operating Factor 99.LP 82.16 72.62
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Reactor Plant Availability 5
100.00 89.33 82.79 NUCLEAR ENTH CORE VI TOTAL Hours critical HRS 7?O.00 7193.05 50,918.73 0
2 Sh Times 3crm -ad Burnup MD/M 661.35 7957.35 Core Average WD/m Region Average A (INNER) 862.561 7983.71P 2h,756.21 B ()EDDIE) 1029.630 9525.1h7 17,200.h3 C (0Urat) 692.83L 6385.316 6385.32
Y.'
"E ATOMIC RTET COMPANY DAILY AVHIAGE IDAD for SEF'I"c2GEr 1907 200 -
W it h
he o N
g Og 150 -
M 2
Di 100 -
ts 4o m
50 -
e 4
m g
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l h
h 10 15 20 25 30 DAYS
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i CORE VIREDION IDCATIONS REION C REION B O
RIDION A O
1.
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