05000316/LER-1979-013-03, /03L-0 on 790407:during Rapid Shutdown,Pressure Was Allowed to Drop to 2,190 Lb Psig.Caused by Spray Valve Which Was Slow to Respond.Spray Placed in Manual & Throttled Back

/03L-0 on 790407:during Rapid Shutdown,Pressure Was Allowed to Drop to 2,190 Lb Psig.Caused by Spray Valve Which Was Slow to Respond.Spray Placed in Manual & Throttled Back

ML17317B161
Person / Time
Site:	Cook
Issue date:	05/02/1979
From:	Murphy C INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17317B160	List: 05000316/LER-1979-013-03, /03L-0 on 790407:during Rapid Shutdown,Pressure Was Allowed to Drop to 2,190 Lb Psig.Caused by Spray Valve Which Was Slow to Respond.Spray Placed in Manual & Throttled Back 05000316/LER-1979-014-03, /03L-0 on 790404:on Two Occasions Rod Position Indication Exceeded 12-step Limit.Caused by Drifting of Signal Conditioning Modules,Which Were Adjusted for Proper Output ML17317B159
References
LER-79-013-03L, LER-79-13-3L, NUDOCS 7905070590
Download: ML17317B161 (4)

LER-1979-013, /03L-0 on 790407:during Rapid Shutdown,Pressure Was Allowed to Drop to 2,190 Lb Psig.Caused by Spray Valve Which Was Slow to Respond.Spray Placed in Manual & Throttled Back

Event date:
Report date:
3161979013R03 - NRC Website

text

Qg NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION I7.77)

/'CENSEE EVENT REPORT e

, CONTROL BLOCK:

Q1 (PLEASE PRINT OR TYPE AI.LREQUIRED INFORMATION)

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LICENSEE CODE 14 16 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 CON'T Essss, ~L Qs 0

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Q10

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I UNIT DUE TO A HIGH

~03 LEVEL ALARM ON AN UPPER LUBRICATING OIL POT OF THE II1 REACTOR COOLANT PUMP.

WHILE

~o4 PERFORMING THIS RAPID SHUTDOWN THE PRESSURE WAS ALLOWED TO DROP TO 2190 PSIG IN

~os VIOLATION OF TECH.

SPEC" 3.2.5.b.

MAXIMUM TIME LIMIT EXCEEDED WAS 4 MINUTES ~

ALSO

~os DURING THIS LOAD REDUCTION, THE AXIAL FLUX DIFFERENCE (AFD)

EXCEEDED THE + 5/0 TARGET BAND IN VIOLATION OF TECH ~

SPEC

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3 ~ 2 ~ 1

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THE UNIT WAS OUT OF THE TARGET BAND o

B FOR A TOTAL OF 3 MINUTES.

SIMILAR OCCURRENCES INCLUDE 79-006,

--- (CONTINUED) 80 7

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~OB SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

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9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION LER/RO EVENT YEAR REPORT NO.

CODE TYPE NO.

017 REPQRT ~79

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~01 3

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~03

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0 21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRDP PRIME COMP.

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

SUPPLIER MANUFACTURER Q16 LgQ>>

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LQQ23 L~JQ2" UJQ26 Q26 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 o

THE PRESSURE AND FLUX TRANSIENTS WHI H WERE EX T

DURING SUCH A LOAD REDUCTION.

EACH CONDITI W

RETURNED TO THE NORMAL RANGE WELL WITHIN THE TIME LIMIT IN THE ACTION STATEMENTS.

3 THE ROD INSERTION CAUSED THE AFD TO LEAVE THE TARGET BAND BEFORE THE 50K POWER LEVEL WAS REACHED BUT UNIT WAS REMOVED FROM SERVICE IMMEDIATELY CONTINUED 7

8 9

FACILITY

'TATUS 95 POWER OTHER STATUS Q s

F 26 0

9 5

2g NA 9

11 12 LOSS OF OR DAMAGETO FACILITY 43 TYPE

DESCRIPTION

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10 PUBLICITY ISSUED DESCRIPTION Q46 L~JS 9

10 CD 0 ~0 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITYQ [116] ~Z Q33

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10 11 44 45 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION Q3 O'2 ~00 0 0" ~ZQEE II4 7

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11 12 13 PERSONNEL INJURIES NUMBER DESCRIPTION 41

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04s NA DISCOVERY DESCRIPTION Q32 LOCATIONOF RELEASE Q NA 80 80 80 80 7

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NAME OF PREPARER C.

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MURPHY NRC USF. ONI Y 68 69 PHQNE (616) 465-5901 x-316 80 80 ES ES 80 ~ Es

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LICENSEE EVENT REPORT 8 79-013/03L-0 PAGE TWO 2

EVENT DESCRIPTION

AND PROBABLE CONSE UENCES:

78-089,78-073, 78-063,78-013.

CAUSE DESCRIPTION AND-CORRECTIVE ACTIONS:

THEREAFTER.

THE PRESSURE DROP WAS CAUSED BY A SPRAY VALVE WHICH WAS SLOW TO RESPOND.

OPER-ATOR ACTION WAS TO PLACE SPRAY IN MANUAL AND THROTTLE BACK ON THE SPRAY; THIS ALLOWED THE PRESSURE TO RETURN TO NORMAL.

NO FURTHER ACTION IS PLANNED.

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