ML17326B574

LER 89-008-00:on 890311,discovered That Automatic CO2 Actuation Sys for Reactor Cable Isolated W/O Required Fire Watches.Caused by Worn Keys.Worn Key Replaced & Security Replaced CO2 Key Lock Switch regularly.W/890403 Ltr

ML17326B574
Person / Time
Site:	Cook
Issue date:	04/03/1989
From:	Runser H, Will Smith INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-89-008, LER-89-8, NUDOCS 8904140485
Download: ML17326B574 (5)

Text

~ ACCKKZP>TED Dl.'i~BUTION DEMONSTR TION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:8904140485 DOC.DATE: 89/04/03 NOTARIZED: NO DOCKET FACIL:50-316 Donald C. Cook Nuclear Power Plant, Unit 2, Indiana & 05000316 AUTH. NAME AUTHOR AFFILIATION RUNSER,H.F. Indiana Michigan Power Co. (formerly Indiana & Michigan Ele SMITH,W.G. Indiana Michigan Power Co. (formerly Indiana & Michigan Ele RECIP.NAME RECIPIENT AFFILIATION

SUBJECT:

LER 89-008-00:on 890311,reactor cable tunnel C02 for Quadrants 1,3 & 4 inoperable w/o required firewatch.

W/8 DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR ENCL SIZE:

TITLE: 50.73 Licensee Event Report (LER), Incident Rpt, etc.

NOTES RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME PD3-1 LTTR ENCL ID CODE/NAME PD3-1 PD LTTR ENCL LA 1 1 1 1 STANG,J 1 1 INTERNAL: ACRS MICHELSON 1 1 ACRS MOELLER 2 2 ACRS WYLIE 1 1 AEOD/DOA 1 1 AEOD/DS P/TPAB 1 1' AEOD/ROAB/DS P 2 2 DEDRO 1 IRM/DCTS/ DAB 1 1 NRR/DEST/ADE 8H. 1 1 NRR/DEST/ADS 7E 1 0 NRR/DEST/CEB 8H 1 1 NRR/DEST/ESB 8D 1 1 NRR/DEST/ICSB 7 1 1 NRR/DEST/MEB 9H 1 1 NRR/DEST/MTB 9H 1 1 NRR/DES T/PS B 8D 1 1 NRR/DEST/RSB 8E 1 1 NRR/DEST/SGB 8D 1 1 NRR/DLPQ/HFB 10 1 1 NRR/DLPQ/QAB 10 1 1 NRR/DOEA/EAB 11 1 1 NRR/DREP/RPB 10 2 2 B 9A 1 1 NUDOCS-ABSTRACT 1 1 02 1 1 RES/DSIR/EIB 1 1 RES/DSR/PRAB 1 1 RGN3 FILE 01 1 1 EXTERNAL EG&G WILLIAMSg S 4 4 FORD BLDG HOY g A 1 1 H ST LOBBY WARD 1 1 LPDR 1 1 NRC PDR 1 1 NSIC MAYS,G 1 1 I

NS C MURPHY g G ~ A 1 1 S

h NOPE 'IO ALL "RIES" RECIPIENIS'LEASE HELP US K) REDUCE ~ASTE! CONZACI' DOCUMENI'DNIROL DESK, ROOM Pl-37 (EXT. 20079) IO EZZMZNATE YMR NAME FBI DISTRIBUTION LISTS FOR DOCUMENI'S YOU DON'T NEED TOTAL NUMBER OF COPIES REQUIRED: LTTR 44 ENCL 43

NRC Form 355 U.S. NUCLEAR REQULATOAY COMMISSION (943)

APPAOVED OMB NO. 31604104 EXPIRES: 6/31/SS LICENSEE EVENT REPORT (LER)

FACILITY NAME Ill DOCKET NUMBER (2) PAGE 3 D. C. Cook Nuclear Plant Unit 2 0 5 0 0 0 3 16 > oF0 3 Reactor Cable Tunnel C02 For Quadrants 1, 3 and 4 Inoperable Without Required Firewatch Due to False Indication of Status Caused b Worn Isolation Switch Ke EVENT DATE (5) LER NUMBER ISI REPORT DATE (7) OTHER FACILITIES INVOLVED IS)

SEQUENTIAL ttSVIQON FACILITYNAMES DOCKET NUMBERIS)

MONTH OAY YEAR YEAR NUMBER 38 NVMSSR MONTH DAY YEAR 0 5 0 0 0 0 3 8 9 8 9 0 0 8 0 0 0 4 0 3 8 9 0 5 0 0 0 THIS REPORT IS SUBMITTED PURSUANT T0 THE REQUIREMENTS OF 10 C FR (I: IChech one or more of the follovfinPJ (11)

OPERATING MODE (9) 4 20A02(bl 20.405(e) 50.73(el (2)(lvl 73.71(b)

POWER 20,406( ~ l(1)(I) 50M(el((l 60.73(e) (2) (v) 73.71(c)

LEvfL 0 0 0 20.405(e l(1) (ill 50.35(c) (2( 50.73(e l(2) (vill OTHER ISpeclfy In Abrtrect below end ln Tent, HRC Form 20.405(el(1)(IBI 50.73(e I l2)(l) 50,73(e) (2((villI (Al 366AI 20.405(e) (1l(lv) 6073(e)(2)ISI 60.'73(e)(2) (vlSI(BI 20A05 I~ I (1 I (vl 50.73(e) (2)(ill) 60.73(e l(2) (el LICENSEE CONTACT FOR THIS LER (12)

NAME TELEPHONE NUMBER AREA CODE H. F. Runser, Operations Superintendent 6 16 46 5 5 90 1 COMPLETE ONE LINE FOR EACH COMPONENT FAILURE Of SCRIBED IN THIS REPORT l13)

MANUFAC REPORTABLE ..  % MANUFAC. EPOATABLE CAUSE SYSTEM COMPONENT TO NPRDS 4 CA SE SYSTEM COMPONENT TURER TURER TO NPRDS N

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SUPPLEMENTAL REPORT EXPECTED (14) MONTH OAY YEAR EXPECTED SUBMISSION DATE 06)

YEB Ilfyer, complete ExPEcTED $ (IEhtlssloH DATEI X NO ABSTRACT ILlmlt to f400 rpeceL I e., epproelmetely fifteen rlnpleepece typewritten lined (16)

On March ll, 1989, at 0821 hours0.0095 days <br />0.228 hours <br />0.00136 weeks <br />3.123905e-4 months <br />, carbon dioxide (C02) actuation system for the reactor cable tunnel it was identified that the automatic quadrants one, three and four; had been isolated since 0403 hours0.00466 days <br />0.112 hours <br />6.66336e-4 weeks <br />1.533415e-4 months <br /> without the required firewatch. The C02 automatic actuation was isolated via the local key lock isolation switch at 0357 to allow personnel entry. After personnel exited the area, the key lock switch was restored to what was thought to be the normal position. This was verified by the local indicating light extinguishing when the key lock switch was turned. A second person verified by visual observation that the switch had been restored to the normal position.

At 0831, permission was requested to isolate the reactor cable tunnel C02 syst'm. The Control Room operator identified that the associated NC02 isolated" annunciator alarm was already in. It was then identified that the key lock switch was not fully in the normal position.

The root cause of this was an excessively worn key which allowed the key to be removed prior to the switch being fully in the normal position and with only one of the two switch contacts made up (one set of contacts is for the local indicating light, the other set is for the C02 isolation and Control Room annunciator). The worn key was replaced and a policy has been instituted to replace the affected keys on a periodic basis. Also, t'e key lock switches will be modified to operate all of the functions from one set of contacts.

8904140485 $ 90403 PDR ADOCK 05000 16 s PDC NRC Form 355 (94)3) r r

U.S. NUCLEAR REOULATCRY COMMISSION NRC FoIm 388A ~

APPROV EO OM8 NO, 3)EOWIOd (883)

LICENSEE EVENT REPORT ILER) TEXT CONTINuATION EXPIRES: 8/31/88 OOCKET NUMBER (3) LER NUMSER (8) ~ AOE (3)

FACILITY NAME (I)

YEAR ?TNh? SEOUENTIAL:?@ IIEYISION

'.?IR?. NUMdER 'IOS NUM SII D. C. Cook Nuclear Plant, Unit 2 0 5 0 0 0 3 ] 6 8 9 0 0 8 0 0 02oF 0 3 TEXT lllmom o/Moo /o mdM)ed. ooo ~ //O?mo/ HRC /omI 3R(hl'o/ (11)

Conditions Prior to Occurrence Unit Two in Mode 4 (Hot Shutdown).

Descri tion of Event On March 11, 1989, at 0831 hours0.00962 days <br />0.231 hours <br />0.00137 weeks <br />3.161955e-4 months <br />, it was identified that the automatic carbon dioxide (C02) actuation system (EIIS/LW) for the reactor cable tunnel quadrants one, three and four; had been isolated since 0403 without the required firewatches.

The C02 automatic actuation was isolated via the key lock switch (EIIS/LW-HS) at 0357 to allow personnel entry. After personnel exited the area, the key lock operated switch was restored to what was thought to be the normal position. This was verified by the local indicating light extinguishing, when the key lock switch was turned. A second person verified by visual observation that the switch had been restored to the normal position.

At 0831, permission was requested to isolate the reactor cable tunnel C02 system. The Control Room operator identified that the associated "C02 isolated" annunciator alarm was already in. It was then identified that the key lock switch was not fully in the normal position.

Cause of Event The-key lock switch has two sets of contacts which are arranged in a gang fashion. The key switch operates the first set of contacts and the first set of contacts then operate the second set of contacts. The first set. of contacts are for the local indicating light; the second set is for the automatic actuation circuitry and the Control Room alarm annunciators. The switch is also designed such that the key can only be removed if the switch is fully in the normal or isolate position.

Investigation of this event determined that the key could be removed from the switch, prior to being in the full normal or isolate position, if the key was excessively worn. It was also determined that the first set of contacts could be made up without the second set being made up.

+This event was caused by a worn key as described above and is considered the root cause of this event. Contributing to this event was the failure of the Control Room operators to recognize that the annunciator alarm remained in after the local key lock switch was returned to normal. At the time of this event, a cooldown from Mode 4 to Mode 5 was in progress. The level of activity in the Control Room contributed to the operators not identifying the problem.

NIIC SOIIM Sddo (883) h I "hh ho ll h h'h h, ~ .,

qt NRC Form 544A U.S. NUCLEAR REOULATCRY COMMISSION

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)985)

LICENSEE EVENT REPORT (LER) TEXT CONTINUATION R) APPROVEO OMS NOglYO&10d EXPIRES: 8/21/88 FACILITY NAME 11) OOCKET NUMBER (2) LMHUQSER (41 PACE IS)

YEAR S&~ 5EOVENTIAL <%i  ::W'EVISION

'SIC NVM ER NVMddR D. C. Cook Nuclear Plant, Unit 2 0 5 0 0 0 3 ] 6 8 9 9 0 8 0 RPgOF 03 TEXT /// more <<>>ee /5 /e//rkerL Iree ~//RC Form 2//SAY/ (17)

Anal sis of Event The isolation of the C02 system without compensatory fire watch cove)'E)ge;.

was in violation of Technical specification 3.7.9.3 action a, and. is.M reportable under 10 CFR 50.73 (a)(2)(i)(B). )I't has been concluded that in the unlikely event of a Ifi;re, personnel would have been promptly aware of its presence and been able to control and:.

extinguish the fire without significant propagation or equipment damegeL>

This conclusion is based on the following: 1) the relratfvely low fixhd combustible load within the area involved; 2) the physical and administrative limits on the introduction of transienOnaqmbustibles;~3)'I Operable early warning fire detection systems (consisti,ag; of both ionization and infrared detectors), and 4) the existen9q of a trained:

on-shift fire brigade.

Based on the above,,this event. is, not considered to havaocreated, any '.  !

significant safety concern and did not constitute an unreviewed safety question as defined by 10 CFR 50.59, nor did it create>l significant hazard to the health and safety of the general public. ;on Corrective Aetio

1. The worn key was replaced and the Security Department has instituted a policy of replacing all of their C02 key lock switch keys on a periodic basis.

2. The circuitry for the C02 key lock switch local indication lights will be modified so that they operate off of the same<switch contact which isolates the automatic C02 actuation. This willabe done for Unit Ohe and Unit Two switches. This modification will prevent a false indication of C02 system status. The modifications are tentatively=

scheduled for completion by 12/31/90.

This event was discussed with several Operations Department personnel.

It was determined that the knowledge level in regard to responsibilities associated with the C02 system annunciator alarms is adequate.'o further corrective action in this area is warranted.s Failed Com onent Identification None, Previous Similar Events None NRC FORM 5ddA (982 I

Indiana Michigan Power Company

'Cook Nuclear Plant P.O. Box 458

~

Z Bridgman. Ml 49106 616 465 5901 i1NQMÃA NFCMGAN POMfEiV April 3, 1989 United States Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555 Operating License DPR-74 Docket No. 50-316 Document Control Manager:

In accordance with the criteria established by 10 CFR 50.73 entitled Licensee Event Re ortin S stem, the following report is being submitted:

89-008-00 Sincerely, G. Smith, Jr.

Plant Manager WGS:clw Attachment cc: D. H. Williams, Jr.

A. B. Davis, Region Alexich III M. P.

P. A. Barrett J. E. Borggren R. F. Eroeger NRC Resident Inspector Wayne scott, NRC R. C. Callen G. Charnoff, Esq.

Dottie Sherman, ANI Library D. Hahn INPO PNSRC A. A. Blind S. J. Brewer/B. P. Lauzau