ML20031C236
| ML20031C236 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 11/13/1973 |
| From: | Sewell R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Oleary J US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| AO-12-73, NUDOCS 8110060659 | |
| Download: ML20031C236 (3) | |
Text
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FACILITY:
CATECORT: REPORT TYPF.:
SCURCE:
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RTPORT DATF:
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DFSCRIPTION OF $ENT:
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80 COMPONENT CAUSE CODE: A-PI250NNEL FRROR D-PROCEDLTES DEFECTIVE EMSFR :
B-DESICN ERROR E-COMPONENT FAILURE
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ADDITIONAL FACTORS:
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November 13, 1973 Q
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Re: Docket No 50-155 h
Mr. John F. O' Leary, Director s'8h y
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License No DPR-6 Directorate of Licensing US Ato:: Lie Energy Co==ission C
7' Washington, DC 205!.5 l
Dear Mr. O' Leary:
The following are abnor=al occurrences at Big Rock Point during the serveillance shutdown of November 1, 2 and 3,1973:
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AO-11-73 I
On November 1, prior to performing m intenance on the condenser
~f f'ij off-gas system, the 6" off-gas bypass valve was found to be in the open position. Investigation indicated the valve had been in the open posi-q[mT@
.g tion since start-up after the refueling outage in April 1973.
f N:S c J @g i Operating practice is to use this valve in the open position Of5 9
for venting purposes during shutdom periods when replacing the off-gas AMI
[$,Q filter asse=bly at the stack 1ase. The valve is equipped for locking and D
its condition is nor= ally controlled by logbook entry. The oversight occurred following the investigstion of the off-gas holdup piping sys-N/g p%J;.
tem during the April refueling outage.
M.N Q If a high off-gas release rate were to occur during operation
[ j[{.y with the bypass valve open, the open bypass valve would preclude auto-4.p,"
B[UAW.y. E matic isolation of the off-gas systen. However, during this pertod of V[/h operation with the bypass valve open, ad=inistrative controls were in
% y+:Q effect to limit off-gas release rates to well below the set point for b{kiM M
auto::atic isolation. (Refer to our letter to the Directors + e of Licensing dated June 26,1972.) The open bypass valve cid not jeoparCite the abil-ity of the plant. staff to implement the::e administrative controls.
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To preclude this from recurring, the val.c illl be added to gg$
a plant start-up checkoff list that vill require appropr.'ste position mg '.
fE 3 F.A$h,m) verification.
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A0-12-73 During calibration tests on November 2,1973, the four high condenser pressure scram bypass pressure e,vitches (RE15A, RE15B, RE15C and RE15D) were found to be set higher than the 350 psis set point limit specified in Technical Specification 6.1.3(E). RE15A operated at 362 pais, RE15B operated 'at 395 psig, RE15C opetated at 352 psig and RE15D
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operated at 360 psig. The instruments were being checked as a result of K
a Plant Review Co==ittee reco=mendation following previous set point drift problems as reparted in our letter to the Directorate of Licensing u
dated May 8, 1973 These switches have been reset at 3h0 psig and vill be checked again during the next outage in an atte=pt to determine if drift is occurring.
g A0-1%73 During checkoff procedures on November 3,1973 for the neu-tron monitorins system, the co:pensating power supply for the Channel h
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log N/ period neutron nonitor was found to be reverned in polarity.
In-Y y vestigation revenled that the reversal was the result of installing a y
spare power supply during corrective maintenance procedures on June h,
.j 1973. Operational ebecks cannot be adequately performed at high flux d;f y
levels and thus the problem was not discovered until the subsequent re-g%$
'4 actor shutdown and its required start-up checkoffs on November 3, 1973 p%
Operation of this channel with the compensating voltage polarity I
reversed results in improper gac=a compensation. At the power levels E.!?
associated with power operation, the effect is not noticeable and power
- 16'I level infor=ation is provided by other instrumentation. At lover Ivwer My levzls, the error is noticeable and period indication is effected. The M/
second channel was found to be operating properly during the pericd that L' l J ';
the co=pensating voltage polarity was reversed on.the first. Only one K^h of two channels is required to initiate a period trip signal. The log k M; IM
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N/ period neutron monitors are required to be operable during start-up from approximately 10~5% to about 5% of rated power. For operation above
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f approximately 5% of rated pover, logarith=ic neutron flux level informa-1 tion and period scram protection are not required.
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To preclude recurrence of this type of problem, the instrument gM maintenance procedures will be changed to include verified checks of the hQ j
status of the power supplies for compensated ion chamber channels when 1
replaced during power operation.
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y;d Yours very truly, psg
- q ue ik**Ji r:m., y Ralph B. Sevell (Signed) jgr s,,
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RBS/ map Ralph B. Sevell Nuclear Licensing Administrator 4
CC: JBKeppler, USAEC
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