ML17317B467
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COJP+Q/g DONALD C. COOK NUCLEAR PLANT P.O. Box 458, Bridgman, Michigan 49106 I
August 15, 1979 Mr. J.G. Keppler, Regional Director Office of Inspection and Enforcement United States Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 Operating License DPR-58 Docket No. 50-315
Dear Mr. Keppler:
Pursuant to the requirements of the Appendix A Technical Specifications the following report/s are submitted:
R0.78-065/03X-1 RO 79-022/03X-1 RO 79-030/03X-1 RO 79-038/03L-0 RO 79-039/03L-0 Sincerely, D.V. Shaller Plant Manager cc:
JOE.
Dolan R.W. Jurgensen R.F. Kroeger R. Kilburn R.J. Vollen BPI R.E.
Masse RO:III R.C. Callen MPSC P.W. Steketee, Esq.
R. Walsh, Esq.
G. Charnoff, Esq.
G. Olson J.M. Hennigan PNSRC J.F. Stietzel Dir., IE (30 copies)
Dir., MIPC (3 copies)
AUG 20 t979
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"UPDATF~PORT PREVIOUS REPORT SUBMIT+ 1gl6$9
'tLICENSEE EVENT REPORT CONTROL BLOCK:
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Q9 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES ~10 ON 12-29-78 INDI'CATION FOR PRESSURIZER LEVEL CHANNEL TWO WAS FOUND TO BE READING APPROX IMATELY5 PER CENT LOWERTHAN CHANNE;L-ONE AND APPROX IMATELY3 PER CENT LOWER THAN CHANNEL THREE.
THE CHANNEL TWO BISTABLES WERE PLACED IN THE TRIP MODE PURSUANT STOT.S.TABLE 3.3-3 I'TEM10 ACTION STATEMENT 148,SIMILAR OCCURRENCES INCLUDE RO 050-315/78-10,41,59 AND 050-315/78-61,
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SUPPLIER MANUFACTURER gJQ19 ~ Q19 ~ Q29 ~ Q21 QJ Q23 ~ Q24
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0 Q25 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 THROUGH INVESTIGATION IT WAS DISCOVERED THAT CHANNEL ONE, NOT CHANNEL TWO WAS THE INOPERABLE CHANNEL.
UPON DISCOVERY, THE CHANNEL TWO BISTABLES WERE RESTORED TO NORMAL AND CHANNEL ONE WAS PLACED IN TRI'P, THE CAUSE OF THE HIGH INDICATION WAS 3
ATTRIBUTE D TO A GAS P0 C KET L0 CATE D IN THE S E INS ING LINE AND UP0N R E PAIRAND RESTORATION INDICATION RETURNED TO NORMAL.
SEE SUPPLEMENT, 7
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FACILITY STATUS Yo POWER OTHER STATUS QBO D
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10 12 13 44 45 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITYQ LOCATIONOF RELEASE Q
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'0 11 45 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION Q39
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11 12 13 PERSONNEL INJURIES 80 80 80 80 7
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Beilman NRC USE ONLY 68 69 616-465-5901 80 19 94 49 2
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SUPPLEMENT TO LER g 78-065/03X-1 SUPPLEMENT TO CAUSE DESCRIPTION THE EVENT ORIGINALLY REPORTED UNDER RO-050-315/78-065, REVISION 0 AND AS AMMENDED IN THXS REPORT IS NOT LONGER A REPORTABLE OCCURRENCE AS DEFINED BY T.S.
PARAGRAPH 6.9.1.9 DUE TO A RECENT T.S.
AMMEND-MENT WHICH DELETED ALL PRESSURXZER LOW LEVEL OPERABILITY REQUIRE-MENTS.
THE DESXGN CHANGE (RFC-12-1598)
WHICH WAS PREPARED TO CORRECT THE RECURRENT PRESSURXZER LEVEL PIPING PROBLEM HAS BEEN CANCELLED DUE TO THE T.S.
AMMENDMENT AND RESULTING PLANT MODIFICATXONS.
NRC FORM 366 I7-77 I
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Q70 SOURCE 60 61 DOCKET NUMBER 68 69 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Qlo DURING A BATTERY EQUALIZING CHARGE OF THE CD BATTERIES, TWO 120 VOLT QS 0
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8 U. S UCLEAR REGULATORY COMMISSION "UPDATQaiREPORT - PREVIOUS REPORT DATE 4 79"
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LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58
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~06 A.C.'ITAL BUSSES FAILED NEARLY SIMULTANEOUSLY CAUSXNG A REACTOR TRIP AND SAFETY INJECTION.
THE RESTORATION TIME LIMIT SPECIFIED BY T.S. 3.8.2.1 WAS. OBSERVED WHILE THE VITAL BUSSES WERE REPAIRED AND RETURNED TO SERVICE.
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INVERTER FAILURE OCCURRED UPON MALFUNCTION OF SEVERAL INTERNAL, 9
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COMPONENT TAKEN ACTION ON PLANT METHOD HOURS +22 SUBMITTED FORM SUB.
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ELECTRONIC PARTS.
THE PARTS WERE REPLACED AND THE INVERTERS WERE S
RETURNED TO SERVXCE AFTER VERIFYING PROPER OPERATXON.
SEE SUPPLEMENT.
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% POWE R OTHER STATUS Q E
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10 12 13 44 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITYQ EKI 'ss WQ34 NA 7
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11 12 13 PERSONNEL INJURIES METHOD OF DISCOVERY DISCOVERY DESCRIPTION Q32
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10 NAME OF PREPARER T. P. Beilman PHONE 80 68 69 616-465-5901 80 NRC USE ONLY cVa 80 a
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ATTACHMENT TO LER 479-022/03X-1 SUPPLEMENT TO CAUSE'ESCRIPTION TO PREVENT RECURRENCE, THE BATTERY EQUALIZING CHARGE HAS BEEN REDUCED FROM 280 VOLTS TO 275 VOLTS WHICH PROVIDES A MORE'ONSERVATXVE MARGIN BETWEEN CHARGE VOLTAGE AND THE INVERTER'D.C.
INPUT LIMIT.
ADDITIONALL'Y A DESXGN CHANGE (RFC-12-1729)
HAS BEEN REQUESTED TO PROVXDE AN OVER-VOLTAGE ALARM ON THE BATTERY CHARGER OUTPUT TO ALERT OPERATORS IF THE CHARGE VOLTAGE EXCEEDS 2 8 0 VOLTSi WHICH IS THE MANUFACTURERS UPPER D.C.
XNPUT LXMXT,
NRC FORM 366 I7-77)
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9 Q 60 61 DOCKET NUMBER 68 69 EVENT PATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Q10 WHILE PERFORMING A ROUTINE SURVETLL'ANCE TEST ON THE AB DIESEL GENERATOR IN ACCORDANCE WXTH T. S.
4. 8. 1. 1. 2. b. 3 THE LOAD CONSERVATION 4
CXRCUITRY DID NOT FULLY FUNCTION AS REQUXRED ~
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~Q25 Q26 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE "ACTIONS Q27 INVESTIGATXON REVEALED THAT A RELAY FAILED TO SUCCESSFULLY SEAL IN ALLOWING THE CIRCUXT TO MAINTAINVARIOUS NON-ESSENTIAL LOADS WHICH SHOULD HAVE DEENERGXZED DURING A NORMAL SEQUENCE.
AS PREVENTATIVE ACTION DESIGN CHANGE.RFC-DC-12-2384 WAS SUCCESSFULLY XNSTALLED IN
~13 BOTH UNITS ONE AND TWO TO PROVIDE REDUNDANCY FOR THE AFFECTED RELAYS.
NAME OF PREPARER T. P. Beilman 7
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FACILITY STATUS R%%d POWER OTHER STATUS Qso 0
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ATTACHMENT TO LER 5 79-030/03X-l SUPPLEMENT TO CAUSE DESCRIPTION J
PRIOR TO THIS EVENT A DESIGN CHANGE WAS INSTALLED IN BOTH UNITS ONE AND TWO WHXCH INADVERTANTLY REDUCED THE TIME (CYCLES) AVAXL-ABLE FOR THXS RELAY TO PERFORM ITS SEAL-IN FUNCTION.
THIS DESIGN
- CHANGE, COUPLED WITH RELAY DEGRADATXON CAUSED-THE RELAY TO REACT SLOWER DURXNG SEQUENCING.'S THERE ARE FOUR RELAYS PERFORMXNG THIS FUNCTION ON SEPARATE TRAINS (TWO PER UNIT) THE REMAINING THREE WERE TESTED WITH SATXSFACTORY RESULTS.
DUE TO THE SUCCESSFUL TESTS ON THE REMAINING THREE RELAYS g THE CAUSE OF THE ORIGINAL EVENT'WAS ATTRIBUTED TO COMPONENT. DEGRADATION, HOWEVER DESIGN CHANGE RFC l2-2384 WAS XNSTALLED IN ALL FOUR CIRCUITS AS A PREVENTATIVE MEASURE, THE DESXGN CHANGE PROVXDES A REDUNDANT RELAY XN PARALLEL WITH EACH ORXGXNAL'RELAY TO ASSURE PROPER OPERATION NO ADDXTXONALACTION IS CURRENTLY PLANNED.
U.
NUCLEAR REGULATORY COMMISSION NRC FORM 366 L[CENSEE EVENT REPORT CONTROL' LOCK:
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T ~ S 3
1 3
2 SIMILAR OCCURRENCES INCLUDE 050 315/76 13 i 44 i 54 i 315/77 27 i 28 i 33 34 315/78 04 077 38 i 40 i 46 315/79 01 14 23 24 37 6050316/7807g08g223lg414864 75 84 93 AND 316/79-14
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'0 Q26 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 o
ACTUAL ROD POSITION WAS DETERMINED TO BE CONSISTENT WXTH DEMAND POSITION THROUGH SECONDARY COIL VOLTAGE MEASUREMENTS.
THE EVENT CAUSE WAS TRACED TO EA'CH OF THE RESPECTXVE RODS SIGNAL CONDITIONING MODULE WHICH HAD DRXFTED.
FOLLOWING ADJUSTMENT BOTH INDXCATORS 3
FUNCTIONED PROPERLY.
SEE SUPPLEMENT."
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SUPPLEMENT TO LER 0 79-038/03L-0 SUPPLEMENT TO 'CAUSE DESCRIPTION AN ENGXNEERING REVIEW XS IN PROGRESS TO DETERMXNE THE CAUSE OF '.,
THXS RECURRING PROBLEM.
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SOURCE LLJQ6 Q
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'VENTDATE 74 75 REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Q10 WHILE OPERATING AT A CONSTANT 48 PERCENT POWER LEVEL WITH THE CONTROL RODS IN
~03 MANUAL TO DO CORE FLUX MAPPING, TOO MUCH BORIC ACID WAS INTRODUCED INTO THE RCS WHEN MAKING A TEMPERATURE ADJUSTMENT.
THIS CAUSED TAVG TO DROP FURTHER THAN
~06
~06 ANTICIPATED AND, CONTRARY TO T.S. 3.2.5, RESULTED IN PRESSURIZER PRESSURE DIPPING TO 2195 PSIA.
WITHIN TWO MINUTES THE PRESSURE WAS INCREASED ABOVE THE T.S.
MINIMUM OF 2220 PSIA.
PREVIOUS OCCURRENCE 79 021.
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THE OPERATOR COMPENSATED FOR THE EXCESS
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3 THIS CAUSED THE BLENDER TO DELIVER A MUCH LARGER UANTITY OF ACID TO THE RCS THAN 4
HAD BEEN DIALED INTO THE CONTROL SYSTEM BY THE OPERATOR.
CONTINUED 7
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FACILITY STATUS
% POWER OTHER STATUS Q30 I
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CHADWELL Q ~Q ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITYQ 6
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ATTACHMENT TO LER 0: 79-039/03L-0 PAGE Tll0 2
CAUSE DESCRIPTION AND CORRECTIVE ACTIONS:
THE SYSTEM HAS BEEN REPAIRED.
NO FURTHER ACTION IS PLANNED.
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