05000316/LER-1981-016-03, /03L-0:on 810416,setpoint Value for Turbine Impulse Chamber Pressure Bistable Was Discovered to Be Wrong.Caused by Incorrect Tech Specs.Bistables Reset.Tech Spec Change in Progress

/03L-0:on 810416,setpoint Value for Turbine Impulse Chamber Pressure Bistable Was Discovered to Be Wrong.Caused by Incorrect Tech Specs.Bistables Reset.Tech Spec Change in Progress

ML17319A869
Person / Time
Site:	Cook
Issue date:	05/15/1981
From:	Rischling J INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17319A867	List: 05000316/LER-1981-015-03, /03L-0:on 810416,degraded Grid Voltage Relays Were Discovered Out of Spec on T 21A,T 21B,T 21C & T 21D Buses. Cause Not stated.Re-evaluation of Relay Tolerances Underway 05000316/LER-1981-016-03, /03L-0:on 810416,setpoint Value for Turbine Impulse Chamber Pressure Bistable Was Discovered to Be Wrong.Caused by Incorrect Tech Specs.Bistables Reset.Tech Spec Change in Progress ML17319A865
References
LER-81-016-03L, LER-81-16-3L, NUDOCS 8105210335
Download: ML17319A869 (10)

LER-1981-016, /03L-0:on 810416,setpoint Value for Turbine Impulse Chamber Pressure Bistable Was Discovered to Be Wrong.Caused by Incorrect Tech Specs.Bistables Reset.Tech Spec Change in Progress

Event date:
Report date:
3161981016R03 - NRC Website

text

REGULATO INFORMATION DISTRIBUTION STEM (RIDS)

ACCESSION

- NBR ~ 8105210335 DOC ~ DATE!

8 1/05/15 NOTARIZED~

NO 1-AcILt:50 516 Donald c ~

cook Nucl ear Power Plant<

Onit 2~ Indiana AOVH ~ SAME AUTHOR Af FlLIATION RISCALINGp J ~ L, Indiana

& Michigan Electr ic Co ~

RFCIf iNAM4 RECIPIENl AFFILIATION Region 3gChicagoi Office of the Dir ector

SUBJECT:

LER 81-016/03L. 0:on 6104]6'<setpoint value, for turbine.

(mpulse cRamber pressure bisteble was" discovered to be-.

wrong. Caused by incor rect Tech Specs.Bistables reset; lech Spec change in progress, DOCKEiT>> 0 05tb00316 DISTRZBuTroN cooE,:

A002S f'ITCH,- Incident Aepor ts COPIES RECEI VEO: L>TR ENCL SIZE-:

,1 NOTES:Send 3 copies. of a11 material to 1&E; 05000316 RNALe A/D COMP&STRU06 A/D MATL & QU08 A/D PLANT. SYS10, A/0 SFTY ASSE12'EOD ASLBP/J ~ HARD CHEM ENG BR lb.

CORE PEHF BR 18.

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INDIANA'& MICHIGANEIECTRIC COMPANY DONALDC. COOK NUCLEAR PLANT P.O. Box 468, Bridgman, Michigan 49106 (616) 465-6901 May 15, 1981 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-74 Docket No. 50-316

Dear Mr. Keppler:

Pursuant to th'e requirements of the Appendix A Technical Specifications, the following report/s are submitted:

RO 81-015/03L-0 RO 81-016/03L-O.

Sincerely, D.V. Sheller Plant Manager

/bab cc:

J.E.

Dolan R.S. Hunter R.W. Jurgensen R.F. Kroeger R.W. Kilburn E.

Swanson/N.

DuBry RO:III R.C; Callen MPSC G. Charnoff, Esq.

J.M. Hennigan W. Lavallee EPRI PNSRC J.F. Stietzel E.L. Townley Dir., IE (30 copies)

Dir., MIPC (3 copies)

INMIIog'fgOI,'f<)] hajj i imp%I NAY ~8 l981

~ QA'f 1 8 1981

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NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION t7 )77)

[CENSEE EVENT REPORT

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LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 CON'T KD3 soIIRcE ~LQB 0

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 '5 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Q10 DURING A SURVEILLANCE TEST WHILE IN MODE 6 IT WAS DISCOVERED THAT 6-4 KV BUS

~O3

~O4 DEGRADED GRID VOLTAGE RELAYS WERE OUT OF SPECIFICATION HIGH (T.S.

TABLE 3.3-4 ITEM S.b.)

AND 4-4 KV BUS LOSS OF VOLTAGE RELAYS WERE OUT OF SPECIFICATION HIGH WITH 1

RELAY OUT OF SPECIFICATION LOW (T.S.

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INVESTIGATION REVEALED THAT THE DEGRADED GRID VOLTAGE WOULD HAVE ACTUATED AT BUS VOLTAGE OF 3623 VOLTS ON THE T 21A BUS AND 3640 VOLTS ON THE T 21D BUS (T.S. LIMITS 3578 TO 3614 VOLTS).

THE DIESEL START AND LOAD SHEDDING RELAYS FOR THE LOSS OF' 4

VOLTAGE WOULD HAVE ACTUATED AT A BUS VOLTAGE OF 3248 VOLTS ON THE T 21C BUS.

ONE RELAY WAS OUT OF SPECIFICATION ON EACH OF THE

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SEE ATTACHED SUPPLEMENT)

ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITYQ

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ATTACHMENT TO LER¹81-015 03L-0 SUPPLEMENT TO CAUSE DESCRIPTION T 21A, T 21B and T 21D BUSSES.

THESE DID NOT AFFECT THE OPERABILITY OF THE ACTUATION SETPOINTS SINCE IT RE(UIRES SIGNALS FROM TWO OF THREE RELAYS TO ACTUATE THE DIESEL START AND LOAD SHEDDING SEQUENCE.

ONLY ONE RELAY ACTUATED BELOW THE T.S.

TOLERENCE.

THESE RELAY SET-

POINTS, ALTHOUGH IN EXCESS OF THE PLUS OR MINUS 18 VOLT LIMIT, WOULD HAVE ACTUATED BEFORE THE T.S.

VALUE WAS REACHED.

A RE-EVALUATION OF THE PRESENT TOLERANCES OF THESE RELAYS, MANUFACTURED BY G. E.,

MODEL NO.

NGV13, IS IN PROGRESS.

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I Qs DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT OESCRIPTION ANO PROBABLE CONSEQUENCES 10

~02 WHILE REVIEWING ENGINEERING DOCUMENTS ON APRIL 16, 1 981, IT WAS DISCOVERED THAT THE

~03 T.

S.

SETPOINT VALUE FOR THE TURBINE IMPULSE CHAMBER PRESSURE BISTABLES IS WRONG

( T.S.

TABLE 3 3

1 P

7 INTERLOCK 55 PSIA)

THE CORRECT VALUE SHOULD BE 55 PSIG SINCE INITIAL CRITICALITY, THESE BISTABLES HAVE BEEN SET TO A MAXIMUM VALUE OF 66 PSIA, o

8 WHICH IS CONSISTENT WITH A VALUE OF 55 PSIG.

THESE BISTABLES HAVE BEEN RESET TO 55 PSIA UNITL A T. S ~

CHANGE IS APPROVED CORRECTING THIS ERROR ~

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INVESTIGATION REVEALED THAT THE 55 PSIA LIMIT IDENTIFIED BY THE ENGINEERING DOCUMENT AND T.S.

TABLE 3.3-1 SHOULD ACTUALLY BE 55 PSIG.

A T.S.

CHANGE IS IN PROGRESS TO CHANGE THE SETPOINTS TO A MAXIMUM VALUE OF 66 PSIA.

THE TURBINE IMPULSE CHAMBER PRESSURE BISTABLES ARE PRESENTLY SET AT 55 PSIA UNTIL THIS T.S.

CHANGE IS APPROVED.

80 CT3 ACTIVITY CONTENT RELEASED OF RELEASE AMOUNTOF ACTIVITY 6

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10 NAME OF PREPARER J.

L. Ri SChl ing 68 69 616-465-5901 7

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FACILITY

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MAY8 V 1981'