05000316/LER-1979-018-03, /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

/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: 05000316/LER-1979-018, Forwards LER 79-018/03L-0 05000316/LER-1979-018-03, /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
References
LER-79-018-03L-01, LER-79-18-3L-1, NUDOCS 7906010197
Download: ML17317B241 (4)

LER-1979-018, /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

Event date:
Report date:
3161979018R03 - NRC Website

text

NRC FORM366.

S. NUCLEAR REGULATORYCOMMISSION I7-77)

LICENSEE EVENT REPORT CONTROL BLOCK:

Q1 (PLEASE PRINT OR TYPE ALLREQUIRED INFORMATION)

I 6

M I.

0 0

C 2

Qs 0

0 0

0 0

0 0

0 0

Qs I

I I

1 QE~QE 7

8 9

LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE 30 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 2

DURING THE INVESTIGATION OF PERIODI~LARMS FOR STEAM GENERATOR HIGH STEAM LINE FL0W ( S ET II ).

IT WAS DIS C0VE R E D THAT C0 NTR0LLE R.2 P Y 50 6 B ( TU RBIN E IMP ULS 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 7

8 DURING THE PERFORMANCE OF SURVEILLANCE TEST PROCEDURES

(

2 THP 4030 STP 121 AND 122).

SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

~IB Qll UA UC Qss I

N 3

T R

0 Ql4 UCQ>>

UI Q"

9 10 11 12 13 18 19 20 SEOUENTIAL OCCURRENCE REPORT REVISION LFRIRO EVENTYEAR REPORT NO.

CODE TYPE NO.

Q17 REPQRT L77I U ~M U>

LJJ3 UL I J U

21 22 23 24 26 27 28 29 30 31 ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRDQ PRIME COMP.

COMPONENT TAKEN ACTION ON PLANT METHOD HOURS Q22 SUBIIIITTED FORM SUB.

SUPPLIER MANLIFACTURER

~GQ~Q

~ZQ20

~Q 0

0 0

0 ~ Q

~NQ24

~NQ26 W

I 2

0 Q 33 34 35 36 37 40 4'I 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 P

INVESTIGATION REVEALED THAT CONTROLLER PY 506B WAS PLACED IN MANUAL ON AP/IL 17~

1979 APPARENTLY THE CONTROLLER WAIS NOT RESTORED TO THE AUTOMATIC POSITION FOLLOI'IING THE 3

COMPLETION OF THE STP',.

THERE WAS NO S IGN-OFF IN THE PROCEDURE FOR SYSTEM RESTORATION.

SEE SUPPLEMENT.

80 CO ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITYQ [LL6]

Z Q33 Z

Q34 NQ 7

8 9

10 44 PERSONNEL EXPOSURES NUMBER TYPE

DESCRIPTION

T ~00 0

Qss 2

Qss NA 7

8 9

11 12 13 PERSONNEL INJURIES 7

8 9

11 12 LOSS OF OR DAMAGETO FACILITYQ43 TYPE

DESCRIPTION

9 Z Q42 NA 7

8 9

10 P U8 LICITY ISSUED DESCRIPTIONQ HH LJNQ44 NA 8

910'0 LOCATIONOF RELEASE Q36 NA 45 80 80 7$ <<SIO (F7 80 80 NRC USE ONLY E

80 Es 0

68 69 616-465-5901 PHONE:

J.

L. Rischling NAME OF PREPARER 7

8 9

FACILITY

~3P METHOD OF STATUS 36 POWER OTHER STATUS ~

DISCOVERY DISCOVERY DESCRIPTION Q32 1

E E p- ~l0 0

Qs NA UApsl ALARM INVESTIGATION 8

9 10 12 13 44 45 46

~7<

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.

~

q ~