Information Notice 1992-31, Electrical Connection Problem in Johnson Yokogawa Corporation YS-80 Programmable Indicating Controllers

Electrical Connection Problem in Johnson Yokogawa Corporation YS-80 Programmable Indicating Controllers

ML031200388
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
Issue date:	04/27/1992
From:	Rossi C Office of Nuclear Reactor Regulation
To:
References
IN-92-031, NUDOCS 9204210362
Download: ML031200388 (4)

UNITED STATES

NUCLEAR REGULATORY COMMISSION

OFFICE OF NUCLEAR REACTOR REGULATION

WASHINGTON, D.C. 20555 April 27, 1992 NRC INFORMATION NOTICE 92-31: ELECTRICAL CONNECTION PROBLEM IN JOHNSON

YOKOGAWA CORPORATION YS-80 PROGRAMMABLE

INDICATING CONTROLLERS

Addressees

All holders of operating licenses or construction permits for nuclear power

reactors. A

Purpose

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

notice to inform addressees of a potential electrical connection problef in ---

the read only memory (ROM) chip sockets of Johnson Yokogawa Corporationv(JYC

YS-80 programmable indicating controllers (controllers). It is expected that

recipients will review the information for applicability to their facilities.

and consider actions, as appropriate. However, no specific action or wRitteii

response is required.

Description of Circumstances

In July 1991, Yokogawa Electric Corporation (YEC), parent company of JYC,

- issued engineering service note (ESN) 102E, "Troubleshooting of User ROM

Socket for YS-80 Programmable Instruments." In ESN-102E, YEC stated that

YS-80 controller models SLPC*E, SLMC*E, SCMS*E, and SPLR*B had ROM sockets

that did not properly engage ROM pins when the ROM was installed in the

socket.

YEC stated that the problem was caused by the material of the ROM socket wear

plate blades. This material did not exhibit sufficient spring pressure to

adequately engage the ROM pins when the ROM was mounted in the socket, which

could cause an intermittent or inadequate electrical connection when the ROM

was mounted and locked in .its socket. JYC has distributed a letter to its

sales representatives to inform them of the concern.

The YEC design staff in Nakacho, Musashino-Shi, Tokyo, Japan, discovered this

problem while redesigning and improving the YS-80 controller. YEC determined

that any of its YS-80 controllers could exhibit this problem. In ESN-102E,

YEC listed the following symptoms of the problem: (1) the fail lamp

-'illuminates and the controller displays check codes "10," "00," and "04" and

(2) the digital input is not being sent to the controller, but the instrument

is operating as if receiving input. YEC stated that the symptoms of the

problem could differ depending on the program in the ROM.

9204210362 PDe\ 0ie 9 O3 t

foS

I'\

IN 92-31 April 27, 1992 Discussion

The NRC staff was informed of this problem in a December 23, 1991, letter from

Spectrum Technologies USA, Incorporated (Spectrum), and a January 7, 1992, letter from Nutherm International, Incorporated (Nutherm). Nutherm supplied a

total of 22 YS-80 controllers (models SLPC-271*E and SLPC-281*E) to the

Commonwealth Edison Company, and Spectrum supplied 26 YS-80 controllers (model

SLPC-281*E) to the Tennessee Valley Authority. Both vendors informed the

affected licensees of the problem.

JYC recommended that users not make any field changes to the ROM socket because

this action could damage the interfacing printed circuit board. Instead, JYC

suggests that applicable NRC licensees contact Mr. John Jerman, Manager of

JYC's Technical Assistance Center, at (404) 254-0400, extension 137, for further

assistance and information.

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

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

the JYC staff member listed above, one of the technical contacts listed below, or the appropriate Office of Nuclear Reactor Regulation (NRR) project manager.

51,,

Division of Operational Events Assessment

Office of Nuclear Reactor Regulation

Technical contacts: Randolph N. Moist, NRR

(301) 504-2981 Joseph J. Petrosino, NRR

(301) 504-2979 Attachment: List of Recently Issued NRC Information Notices

r . . I

IN 92-31 April 27, 1992 Discussion

The NRC staff was informed of this problem in a December 23, 1991, letter from

Spectrum Technologies USA, Incorporated (Spectrum), and a January 7, 1992, letter from Nutherm International, Incorporated (Nutherm). Nutherm supplied a

total of 22 YS-80 controllers (models SLPC-271*E and SLPC-281*E) to the

Commonwealth Edison Company, and Spectrum supplied 26 YS-80 controllers (model

SLPC-281*E) to the Tennessee Valley Authority. Both vendors informed the

affected licensees of the problem.

JYC recommended that users not make any field changes to the ROM socket because

this action could damage the interfacing printed circuit board. Instead, JYC

suggests that applicable NRC licensees contact Mr. John Jerman, Manager of

JYC's Technical Assistance Center, at (404) 254-0400, extension 137, for further

assistance and information.

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

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

the JYC staff member listed above, one of the technical contacts listed below, or the appropriate Office of Nuclear Reactor Regulation (NRR) project manager.

'Q Ae As ,&~et~

Division of Operational Events Assessment

Office of Nuclear Reactor Regulation

Technical contacts: Randolph N. Moist, NRR

(301) 504-2981 Joseph J. Petrosino, NRR

(301) 504-2979 Attachment: List of Recently Issued NRC Information Notices

Se e F,.< > -e c. C-/a

I -

Attachment

IN 92-31 April 27, 1992 LIST OF RECENTLY ISSUED

NRC INFORMATION NOTICES

Information Date of

Notice No. Subject Issuance Issued to

92-30 Falsification of Plant 04/23/92 All holders of OLs or CPs

Records for nuclear power reactors

and all licensed operators

and senior operators.

92-21, Spent Fuel Pool Re- 04/22/92 All holders of OLs or CPs

Supp. 1 activity Calculations for nuclear power reactors.

92-29 Potential Breaker Mis- 04/17/92 All holders of OLs or CPs

coordination Caused by for nuclear power reactors.

Instantaneous Trip

Circuitry

92-28 Inadequate Fire Suppres- 04/08/92 All holders of OLs or CPs

sion System Testing for nuclear power reactors.

2-27 Thermally Induced Acceler- 04/03/92 All holders of OLs or CPs

ated Aging and Failure of for nuclear power reactors.

ITE/GOULD A.C. Relays Used

in Safety-Related Applic- ations

92-26 Pressure Locking of Motor- 04/02/92 All holders of OLs or CPs

Operated Flexible Wedge for nuclear power reactors.

Gate Valves

92-25 Potential Weakness in 03/31/92 All holders of OLs or CPs

Licensee Procedures for A for nuclear power reactors.

Loss of the Refueling

Cavity Water

92-24 Distributor Modification to 03/30/92 All holders of OLs or CPs

Certain Commercial-Grade for nuclear power reactors.

Agastat Electrical Relays

OL = Operating License

CP = Construction Permit