ML17317A828

LER#78-095/03L-0 on 781206:while Decreasing Turbine Load, Reactor Coolant Average Temp Exceeded 576.2 F.Caused by Faulty Drain Valves on 5-A Heater,Creating Unstable Feedwater Control & Turbine Load

ML17317A828
Person / Time
Site:	Cook
Issue date:	12/20/1978
From:	Murphy C INDIANA MICHIGAN POWER CO.
To:
Shared Package
ML17317A823	List: ML17317A822 ML17317A824 ML17317A825 ML17317A826 ML17317A827 ML17317A828 ML17317A829 ML17317A830 ML17317A831
References
LER-78-095-03L, LER-78-95-3L, NUDOCS 7812270272
Download: ML17317A828 (2)

Text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION

{7.77)

LlCENSEE EVENT REPORT COMTROL BLOCK QI (PLEASE PRINT OR TYPE ALL REQUIRED (NFORMATION)

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~p 7 8 9 M I D C LICENSEE CODE C 2 14 Oz

'15 0 - 0 0 0 LICENSE NUMBER 0 0 - 0 0 25 0 s A 26 1 1 1 LICENSE TYPE 1

30 0s~Qs 57 CAT 58 CON'T

~o ,oso,ULIQs 0 5 0 0 0 3 1 6 Qv1 2 0 6 7 8 Qs 1 2 2 0,.1 78 Qs 7 8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEOUENCES Q10 D 1 AT 1.00 POWER. DEVELOPED TROUBLE WITH 5-A HIGH PRESSURE

~o 3 HEATER LEVEL CONTROL. THE FEEDWATER CONTROL TO THE STEAM GENERATORS BECAME

~o 4 UNSTABLE. PERFORMED AN EMERGENCY LOAD" REDUCTION OF 105 POWER. WHILE DECREASING

~o 6 TURBINE LOAD THE REACTOR COOLANT AVERAGE TEMPERATURE EXCEEDED 576.2 DEGREES FOR

~OB 20 MINUTES IN VIOLATION OF TECHNICAL SPECIFICATION 3.2.5a.

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

~Z.Z Q>> UX Qvs UZ Qvs 2 Z 2 Z Z 2 Qvs UZ Qvs UZ'. Qvs 7 8 9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION EVENT YEAR U

REPORT NO. CODE TYPE NO.

Qvv LERIRO Rsvosv ~78 21 22 23 U00U526 24 "

Uw,28~03 27 29 UL 30 31 Uo 32 ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRDC PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS Q22 SUBMITTED FORM SUB. SUPPLIER MANUFACTURER UXQvs UZQvg UZQvo UZQsi 0 0 0 0 UNQss UNQv4 UQvs 2 9 9 9 Qvs 33 34 35 36 37 40 41 42 43 ~

44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 027 o THE CAUSE OF THIS EVENT WAS.>FAULTY DRAIN VALVES ON 5-A HEATER, CREATING UNSTABLE FEEDWATER CONTROL AND TURBINE LOAD. TURBINE LOAD WAS LOWERED RAPIDLY CAUSING THE TEMPERATURE TRANSIENT OF THE REACTOR COOL'ANT. THE TRANSIENT WAS NOTED AND DEALT 3 WITH BY THE REACTOR OPERATOR. BRINGING IT BACK INTO NORMAL RANGE WITHIN THE TIME 4 LIMIT OF THE ACTION STATEMENT. THE DRAIN VALVES HAVE BEEN REPAIRED.

7 8 9 80 1 5 FACILITY STATUS 6 Qvs ~l0 YI POWER 0 Qvs OTHER STATUS NA

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~3p METHOD OF DISCOVERY UAQsv 8 9 10 12 13 44 45 46 80 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 36 UZ Qss 2 Qss NA NA 7 8 9 10 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION Q3B

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7 8 9 11 12 13 80 PERSONNEL INJURIES

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80 LOSS OF OR DAMAGE TO FACILITY ~43 TYPE DESCRIPTION

~vo Lz{Q4v 7 8 9 10 80 p

ISSUED

~44 PUBLICITY DESCRIPTION ~ NRC USE ONLY 8 9 10 80' NAME OF PREPARER . Mur PHDNEI 61 465-5901 X-231 0.

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