ML17317B241

LER 79-018/03L-0 on 790423:during Investigation of Periodic Alarms for Steam Generator High Steam Line Flow,Controller 2 Py 506B (Turbine Impulse Pressure) Was in Manual Control. Caused by Controller Not Being Returned to Automatic

ML17317B241
Person / Time
Site:	Cook
Issue date:	05/23/1979
From:	Rischling J INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17317B240	List: ML17317B239 ML17317B241
References
LER-79-018-03L-01, LER-79-18-3L-1, NUDOCS 7906010197
Download: ML17317B241 (4)

Text

NRC FORM S. NUCLEAR REGULATORY COMMISSION I7-77)

LICENSEE EVENT REPORT CONTROL BLOCK: Q1 (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

I 6 7 8 9 M I. 0 LICENSEE CODE 0 C 2 Qs 14 15 0 0 0 0 0 LICENSE NUMBER 0 0 0 0 25 Qs 26 I I LICENSE TYPE I 1 30 QE~QE 57 CAT 58 CON'T

~01 "" "'LQR 0 6 0 0 0 3 I 6 QT 0 4 2 3 7 9 Qs 0 5 2 3 7 9 Qs 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES &10 DURING THE INVESTIGATION OF PERIODI~LARMS FOR STEAM GENERATOR HIGH STEAM LINE 2

F L0 W ( S E T II ) . IT WAS I D S C 0 VE R E D T H AT C 0 N T R 0 LL E R . 2 PY 5 0 6 B ( TU R B I N E IMP U LS E PRESSURE) WAS FOUND IN MANUAL CONTROL. THI'S EXCEEDED THE MINIMUM OPERABLE REqUIRE-MENTS OF T.S. TABLE 3.3-3 ITEM 4.d. THIS DISCREPENANCY WAS IMMEDIATELY REMEDIED BY PLACING 2 PY 506B 'IN AUTO. 2 PY-505B SET I'AS ALSO CHECKED TO INSURE IT WAIS IN AUTO

~OB 80 4 7 8 9 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

~IB 7 8 9 10 Qll UA 11 UC 12 Qss 13 I N 3 T R 0 18 Ql4 UCQ>>

19 UI 20 Q"

REVISION

~M SEOUENTIAL OCCURRENCE REPORT U

EVENT YEAR REPORT NO. CODE TYPE NO.

Q17 LFRIRO REPQRT L77I 21 22 23 24 26 U>

27 LJJ3 28 29 UL 30 I

31 J U ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRDQ PRIME COMP. COMPONENT TAKEN ACTION

~GQ~Q 33 34 ON PLANT

~ZQ20 35 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 METHOD

~Q 36 37 0

HOURS Q22 0 0 0 40

~Q SUBIIIITTED 4'I FORM SUB.

~NQ24 42 SUPPLIER

~NQ26 43 44 MANLIFACTURER W I 2 0 47 Q

P INVESTIGATION REVEALED THAT CONTROLLER PY 506B WAS PLACED IN MANUAL ON AP/IL 17~ 1979 DURING THE PERFORMANCE OF SURVEILLANCE TEST PROCEDURES ( 2 THP 4030 STP 121 AND 122).

APPARENTLY THE CONTROLLER WAIS NOT RESTORED TO THE AUTOMATIC POSITION FOLLOI'IING THE 3

COMPLET I ON OF THE STP ', . THERE WAS NO S I GN-OFF IN THE PROCEDURE FOR SYSTEM RESTORATION. SEE SUPPLEMENT.

10'0 8 9 80

~

7 FACILITY ~3P METHOD OF STATUS 36 POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION Q32 CO 1 E 8 9 E p- ~l0 10 0 Qs 12 13 NA 44 UApsl 45 46 ALARM INVESTIGATION ACTIVITY CONTENT RELEASED OF RELEASE Z

AMOUNT OF ACTIVITY Q LOCATION OF RELEASE Q36

[LL6] Z Q33 Q34 NQ NA 7 8 9 10 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION T ~00 0 Qss 2 Qss NA 80 7 8 9 11 12 13 PERSONNEL INJURIES 7$ <<SIO (F7 7 8 9 11 12 80 LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION Q43 9 Z Q42 NA 7 8 9 10 80 P U 8 L I CITY ISSUED DESCRIPTION Q NRC USE ONLY HH 8 LJNQ44 9

NA 68 69 80 E

Es J. L. Rischling 616-465-5901 0 NAME OF PREPARER PHONE:

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I

SUPPLEMENT TO LERk79-018 03L-0 SUPPLEMENT TO CAUSE DESCRIPTION FURTHER INVESTIGATION REVEALED THAT WITH PY-506B IN MANUAL, OPERATION WAS CONSERVATIVE AS LONG AS THE UNIT REMAINED ABOVE 91 PER CENT POWER.

POWER LEVELS BETWEEN APRIL 17 AND 23 REMAINED BETWEEN 96 AND 100 PER CENT.

A REVIEW OF T.S. RPS/ESF CI'RCUITS WAS PERFORMED TO DETERMINE IF ANY ADDITIONAL CONTROLLERS PROVIDE DI'RECT INPUT TO PROTECTIVE FUNCTIONS, THERE WERE NO OTHERS.

TO PREVENT RECURRENCE THE APPROPRIQTE STP'S WERE MODIFIED TO PRO-VIDE A SIGN-OFF TO DOCUMENT SYSTEM RESTORATION.

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