Information Notice 1994-33, Capacitor Failures in Westinghouse Eagle 21 Plant Protection Systems

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Capacitor Failures in Westinghouse Eagle 21 Plant Protection Systems
ML031060558
Person / Time
Site: Beaver Valley, Millstone, Hatch, Monticello, Calvert Cliffs, Dresden, Davis Besse, Peach Bottom, Browns Ferry, Salem, Oconee, Mcguire, Nine Mile Point, Palisades, Palo Verde, Perry, Indian Point, Fermi, Kewaunee, Catawba, Harris, Wolf Creek, Saint Lucie, Point Beach, Oyster Creek, Watts Bar, Hope Creek, Grand Gulf, Cooper, Sequoyah, Byron, Pilgrim, Arkansas Nuclear, Three Mile Island, Braidwood, Susquehanna, Summer, Prairie Island, Columbia, Seabrook, Brunswick, Surry, Limerick, North Anna, Turkey Point, River Bend, Vermont Yankee, Crystal River, Haddam Neck, Ginna, Diablo Canyon, Callaway, Vogtle, Waterford, Duane Arnold, Farley, Robinson, Clinton, South Texas, San Onofre, Cook, Comanche Peak, Yankee Rowe, Maine Yankee, Quad Cities, Humboldt Bay, La Crosse, Big Rock Point, Rancho Seco, Zion, Midland, Bellefonte, Fort Calhoun, FitzPatrick, McGuire, LaSalle, Fort Saint Vrain, Shoreham, Satsop, Trojan, Atlantic Nuclear Power Plant  Entergy icon.png
Issue date: 05/09/1994
From: Grimes B
Office of Nuclear Reactor Regulation
To:
References
-nr IN-94-033, NUDOCS 9405040254
Download: ML031060558 (10)
v • d • e


UNITED STATES

NUCLEAR REGULATORY COMMISSION

OFFICE OF NUCLEAR REACTOR REGULATION

WASHINGTON, D.C. 20555 May 9, 1994 NRC INFORMATION NOTICE 94-33: CAPACITOR FAILURES IN WESTINGHOUSE EAGLE 21 PLANT PROTECTION SYSTEMS

Addressees

All holders of operating licenses or construction permits for nuclear power

reactors.

PurDose

The U.S. Nuclear Regulatory Commission (NRC) is issuing this information

notice to alert addressees to two different types of capacitor failures that

can cause loss of power to portions of Eagle 21 reactor protection systems

manufactured by Westinghouse Electric Corporation. It is expected that

recipients will review the information for applicability to their facilities

and consider actions, as appropriate, to avoid similar problems. However, suggestions contained in this information notice are not NRC requirements;

therefore, no specific action or written response is required.

Description of Circumstances

During the past year, Commonwealth Edison Company (CECo) experienced several

instances of partial loss of electrical power within the Westinghouse Eagle 21 plant protection system at Zion Station, Unit 1, during normal plant

operation. Two types of failures were identified, and these were reported by

CECo Idider Part 21 of Title 10 of the Code of Federal Regulations (10 CFR) on

April , 1994.

One type of failure involved Series RS 300 and RT 300 dc power supplies

manufactured by ASTEC America, with Westinghouse part numbers 2D33574G07 and

2D33574G09. Electrolytic capacitors C2 and C7 failed, causing complete loss

of dc power to the connected loads. Unit 1 at Zion Station has 10 racks of

Eagle 21 equipment. Each rack contains two power supplies. One provides

power to the tester subsystem, which is not essential for performing the

system design safety function. The other power supply provides power for the

loop processor subsystem, which includes reactor protection and engineered

safety features channels and logic, and may include some control room

indication channels. On loss of power, a loop processor channel fails to the

de-energized state, which normally is the tripped state. Containment spray, however, is an energize-to-actuate function, and loss of power would prevent

the channel from tripping. In certain racks, loss of power would also defeat

some control room indications required by Regulatory Guide 1.97.

9405040254 PMk TtC MOA;t 94m033 -e3 14 9

<KIN 94-33 May 9, 1994 The other failure type involved type TDA40DM time delay relays manufactured by

Douglas-Randall, with Westinghouse part number PS12800H02. Ceramic capacitor

C2 failed, causing either repetitive cycling or complete loss of ac power to

the connected loads. The time delay relays are used in the Eagle 21 ac power

distribution panels to sequentially load the power supplies during protection

system startup. The failure consequences are similar to those for the power

supply capacitors described above.

Discussion

The failed capacitors in the ASTEC America dc power supplies were type

SR65, Z5U manufactured by AVX Corporation. The failed capacitors had date

codes from 9130 to 9136 where the first two digits of the date code indicate

the year of manufacture and the last two digits indicate the week within that

year. The capacitors were used in power supplies manufactured in 1991, with

date codes 9134 through 9147. Westinghouse determined that several capacitors

with the suspect date codes shorted or exhibited electrical leakage, and were

cracked or ruptured. The Zion power supplies were returned to Westinghouse, the capacitors with the suspect date codes were replaced, and the power

supplies were tested and returned to service. The ASTEC America power

supplies are used in the following Westinghouse systems:

  • Neutron flux monitoring system (NFMS)
  • Auxiliary Shutdown Indication System (ASIS)
  • Plant Safety Monitoring System (PSMS)
  • Qualified Display Processing System (QDPS)
  • Reactor Vessel Level Instrumentation System - 86 (RVLIS-86)
  • Inadequate Core Cooling Monitor System (ICCM)
  • ATWS Mitigating System Actuation Circuitry (AMSAC)
  • Eagle 21 CECo and Westinghouse determined that the capacitors in the Douglas-Randall

time delay relays were failing prematurely because of excessive heat

dissipated in the epoxy potted module by nearby resistor RI. The problem was

corrected by returning the relays to Westinghouse, where the resistors were

relocated outside the relay module. The relays were tested and returned to

service.

The Zion failures were discussed at an Eagle 21 owners group meeting in

November 1993, but the causes had not been identified at that time. Because

the failures are detectable and a Westinghouse failure analysis determined

that they are aging related and likely to be random rather than simultaneous, Westinghouse elected not to submit a notification under 10 CFR Part 21. For

the power supply failures, Westinghouse advised the NRC that it issued an

Infogram to all customers with Eagle 21 or other affected equipment on

April 29, 1994. For the relay failures, only four of the five Eagle 21 customers are affected, since Sequoyah does not have the relays. Zion is

fully aware of the concerns, and the hardware has been corrected. The Diablo

Canyon system will be corrected before it is shipped to the site.

Westinghouse advised that it was preparing plant-specific followup letters to

Watts Bar, Turkey Point, and Diablo Canyon for issue on April 29, 1994.

V IN 94-33 May 9, 1994 This information notice is being sent to all power reactor licensees because

AVX capacitors and Douglas-Randall time delay relays may be used in other

applications at nuclear power plants.

This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

the technical contact listed below or the appropriate Office of Nuclear

Reactor Regulation (NRR) Project Manager.

Brian . Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contact: Richard C. Wilson, NRR

(301) 504-3220

Attachment:

List of Recently Issued NRC Information Notices

a 4I

Attachment

IN 94-33 May 9, 1994 LIST OF RECENTLY ISSUED

NRC INFORMATION NOTICES

Information Date of

Notice No. Subject Issuance Issued to

93-53, Effect of Hurricane 04/29/94 All holders of OLs or CPs

Supp. 1 Andrew on Turkey Point for nuclear power reactors.

Nuclear Generating

Station and Lessons Learned

94-32 Revised Seismic Hazard 04/29/94 All holders of OLs or CPs

Estimates for nuclear power reactors.

94-31 Potential Failure of 04/14/94 All holders of OLs or CPs

Wilco, Lexan-Type HN-4-L for nuclear power reactors.

Fire Hose Nozzles

90-68, Stress Corrosion Cracking 04/14/94 All holders of 01 or CPs

Supp. I of Reactor Coolant Pump for pressurized water

Bolts reactors.

Leaking Shutdown Cooling 04/12/94 All holders of OLs or CPs

Isolation Valves at for nuclear power reactors.

Cooper Nuclear Station

Charging Pump Trip during 04/11/94 All holders of OLs or CPs

a Loss-of-Coolant Event for pressurized water

Caused by Low Suction reactors.

Pressure

92-51, Misapplication and 04/12/94 All holders of OLs or CPs

Supp. 1 Inadequate Testing of for nuclear power reactors.

Molded-Case Circuit

Breakers

Potential Problems with 04/05/94 All holders of OLs or CPs

Fire-Barrier Penetration for nuclear power reactors.

Seals

94-27 Facility Operating 03/31/94 All holders of OLs or CPs

Concerns Resulting from for nuclear power reactors.

Local Area Flooding

DC = Operating License

CP - Construction Permit

IN 94-33 May 9, 1994 This information notice is being sent to all power reactor licensees because

AVX capacitors and Douglas-Randall time delay relays may be used in other

applications at nuclear power plants.

This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

the technical contact listed below or the appropriate Office of Nuclear

Reactor Regulation (NRR) Project Manager.

Orial signed by

Brian K. Grimeg

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contact: Richard C. Wilson, NRR

(301) 504-3220

Attachment:

List of Recently Issued NRC Information Notices

  • Previous concurrence

OFFICE VIB/DRIL SC/VIB/DRIL BC/VIB/DRIL BC/ICB DRCH

NAME RWILSON* GCWALINA* LNORRHOLM* JWERMEIL*

DATE 4/20/94 4/20/94 4/21/94 4/25/94 OFFICE

NAME

TECH ED

MMEJAC*

GCB/DORS

DKIRKPATRICK*

4/18/94 D/DRIL/NRRS

CEROSSI*

4/28/94 BC/GCB/DORS*

AKUGLER

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4/ /94_

ID

DATE 4/18/94 - f - R - ThI

.94

- - --

OFFICIAL RECORD LUPY U0CUI~eFF rNdme; Vl-SS-2.LN

IN 94-XX

April xx, 1994 This information notice is being sent to all power reactor licensees because

it is possible that the AVX capacitors and the Douglas-Randall time delay

relays may be used in other applications at nuclear power plants.

This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

the technical contact listed below or the appropriate Office of Nuclear

Reactor Regulation (NRR) Project Manager.

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contact: Richard C. Wilson, NRR

(301) 504-3220

Attachment:

List of Recently Issued NRC Information Notices

  • Previous concurrence

OFFICE VIB/DRIL SC/VIB/DRIL BC/VIB/DRIL BC/ICB DRCH

NAME RWILSON* GCWALINA* LNORRHOLM* JWERMEIL*

DATE 4/20/94 4/20/94 4/21/94 4/25/94 OFFICE TECH ED GCB/DORS D/DRIL/NRRS BC/GCB/DORS D/DORS

NAME MMEJAC* DKIRKPATRICK* CEROSSI* AKUGLER BKGRIMES2!,

D4/18/94

- --

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14/18/94 4/28/94

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4T_/94 Uocumfent HdH1U;EMQLcLL.L1 U

1 FiI

4/ /94

IN 94-XX

April xx, 1994 This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

the technical contact listed below or the appropriate Office of Nuclear

Reactor Regulation (NRR) Project Manager.

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contact: Richard C. Wilson, NRR

(301) 504-3220

Attachment:

List of Recently Issued NRC Information Notices

  • Previous concurrence

OFFICE :IB/DRIL SC/VIB/DRIL BC/VIB/DRIL BC/ICB DRCH __]

NAME RWILSON* GCWALINA* LNORRHOLM* JWERMEIL* l

DATE 4/V/94 4/i0/94 4/2//94 4_ _ _l

__94 OFFICE TECH ED GCB/DORS D/DRILLNRRS BC/GCB/DORS D1DORS

NAME MMEJAC* DKIRKPATRICK* C AKUGLER BKGRIMES

DATE 4/18/94 4/18/94 44/L2'04 . 4 /94 4/ /94 OFFICIAL RECORD COPY Document Name:LAULMAN

IN 94-XX

April xx, 1994 This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

one of the technical contacts listed below or the appropriate Office of

Nuclear Reactor Regulation (NRR) Project Manager.

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contact: Richard C. Wilson, NRR

(301) 504-3220

Attachment:

List of Recently Issued NRC Information Notices

  • Previous concurrence

OFFICE VIB/DRIL SCVIB/DRIL BC I/RIL R BC/ICB D__W_ _ _

NAME RWILSO Ai N GCM A LM JWERMEILX

DATE 4/20/94 4/2t/94 4/ZI/94 4/25 9I

OFFICE TECH ED GCB/DORS D/DRIL/NRRS BC/GCB/DORS D/DORS

NAME MMEJAC* DKIRKPATRICK* CEROSSI AKUGLER BKGRIMES

DATE 4/18/94 4/18/94 4

4/ /94 4/ /94 4/ _ _ __

OFFICIAL RECORD COPY Document Name:EAGLE21.IN

IN 94-XX

April xx, 1994 This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

one of the technical contacts listed below or the appropriate Office of

Nuclear Reactor Regulation (NRR) Project Manager.

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contactA Richard C. Wilson, NRR

(301) 504-3220

Attachment:

List of Recently Issued NRC Information Notices

OFFICE VIB/DRIL ICB/DRCH SC/VIB/DRIL BC/VIB/DRIL BC/ICB/DRCH

NAME RWILSON CDOUTT GCWALINA LNORRHOLM JWERMEIL

lDATE 4/ /94 14/ /94 14/ /94 4 /LL94 4/ /94 OFFICE

NAME

D _

17/19/93 GCB/DORS

DKIRKPATRICK

4/lW/94 0 Z

D/DRIL/NRRS

CEROSSI

4/ /94

~.&. a. rftl

BC/GCB/DORS

AKUGLER

. 9Lr.93.

&It

ID/DORS

BKGRIMES

.. 4/ /94

- - - - - -- ------

OFFICIAL RECORD LUPY U0CUffent HdJme:rLCCLL1.ln

IN 93-XX

July XX, 1993 This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

one of the technical contacts listed below or the appropriate Office of

Nuclear Reactor Regulation (NRR) Project Manager.

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contacts: Richard C. Wilson, NRR

(301) 504-3220

Clifford K. Doutt, NRR

(301) 504-2847 Attachment:

List of Recently Issued NRC Information Notices

OFFICE VIB/DRIL ICB/DRCH SC/VIB/DRIL BC/VIB/DRIL BC/ICB/DRCH

NAME RWILSON CDOUTT GCWALINA LNORRHOLM JWERMEIL

DATE 4/ /94 4/ /94 4/ /94 4/ /94 COPY YES YES YES YES NO YES NO

OFFICE TECHED GCB/DORS D/DRIL/NRRS BC/GCB/DORS DDR

NAME rA. rA WOO DKIRKPATRICK CEROSSI AKUGLER BKGRIMES

DATE 711-193 4/ /94 4/ /94 9/ /93 /94 COPY YES YES NO YES NO YES NO YES NO

ar-rowAL ------ --- vY roc rAl___ re

UttILIAL KtLUKU LUPY Document Name:MI.IN


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