Information Notice 1993-23, Weschler Instruments Model 252 Switchboard Meters

Weschler Instruments Model 252 Switchboard Meters
	ML031080024
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, 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, Crane
Issue date:	03/31/1993
From:	Grimes B; Office of Nuclear Reactor Regulation
To:	;
References
	IN-93-023, NUDOCS 9303240274
	Download: ML031080024 (23)
	v • d • e

UNITED STATES

NUCLEAR REGULATORY COMMISSION

OFFICE OF NUCLEAR REACTOR REGULATION

WASHINGTON, D.C.

20555

March 31, 1993

NRC INFORMATION NOTICE NO. 93-23:

WESCHLER INSTRUMENTS MODEL 252

SWITCHBOARD METERS

Addressees

All holders of operating licenses or construction permits for nuclear power

reactors.

7

Purpose

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

notice to alert addressees to possible problems with Weschler Instruments

(Weschler) Model 252 commercial grade switchboard meters.

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

On November 9, 1992, Weschler informed the NRC of sticking meter movements in

some Model 252 meters manufactured and supplied as commercial grade items.

Although Weschler reported having no evidence that meters manufactured

specifically for safety-related service are affected, Weschler was concerned

that affected commercial grade meters could have been dedicated for use in

nuclear safety-related applications.

Discussion

Weschler determined that some of the commercial grade meters returned for

repair or calibration were inaccurate and erratic. The vendor engineering

report attributed this problem to sticking of the meter movement because of an

off-center torsion spring. Weschler determined that this condition resulted

from a deviation in the dimensions associated with the torsion head screws

combined with several coincidental factors that included (1) degradation of

clip-to-torsion screw lubrication, (2) low initial force from the spring- retaining clip or fatigue of the spring-retaining clip, (3) variations in the

alignment of the meter movement during initial assembly, and (4) the effect of

the summation of the dimensional tolerances in the assembly of the

subcomponents.

9303240274 P

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IN 93-23 March 31, 1993 To prevent this deficiency in future products, Weschler revised its production

inspection procedures to specifically require checking the dimensions in

question. Weschler also revised its nuclear quality assurance procedures to.

require specific checks of torsion head screw dimensions, although the vendor

has not detected a problem with meters manufactured specifically for safety- related applications.

Weschler could not determine whether or not any Model 252 switchboard meters

sold as commercial grade items through the various distributors had been

dedicated for use in nuclear safety-related applications.

Therefore, Weschler

has not directly notified any licensees about this problem.

Weschler stated that the principal corrective action it has taken for affected

meters returned for repair and recalibration is to replace the faulty torsion

head screws because they can't be repaired. Upon request, Weschler will give

licensees information about the problem and the recommended corrective

measures.

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: S. V. Athavale, NRR

(301) 504-2974 Attachment:

List of Recently Issued NRC Information Notices

K-I

Attachment

IN 93-23

March 31, 1993 LIST OF RECENTLY ISSUED

NRC INFORMATION NOTICES

Information

Date of

Notice No.

Subject

Issuance

Issued to

93-22

93-21

93-20

93-19

93-18 Tripping of Klockner- Moeller Molded-Case

Circuit Breakers due to

Support Level Failure

Summary of NRC Staff

Observations Compiled

during Engineering Audits

or Inspections of Licen- see Erosion/Corrosion

Programs

Thermal Fatigue Cracking

of Feedwater Piping to

Steam Generators

Slab Hopper Bulging

Portable Moisture-Density

Gauge User Responsibilities

during Field Operations

Safety Systems Response

to Loss of Coolant and

Loss of Offsite Power

Failures of Nut-Locking

Devices in Check Valves

Failure to Verify the

Continuity of Shunt Trip

Attachment Contacts in

Manual Safety Injection

and Reactor Trip Switches

Clarification of

10 CFR 40.22, Small

Quantities of Source

Material

03/26/93

03/25/93

03/24/93

03/17/92

03/10/93

03/08/93

02/19/93

02/18/93

All holders of OLs or CPs

for nuclear power reactors.

All holders of OLs or CPs

for light water nuclear

power reactors.

All holders of OLs or CPs

for PWRs supplied by

Westinghouse or Combustion

Engineering.

All nuclear fuel cycle

licensees.

All U.S. Nuclear Regulatory

Commission licensees that

possess moisture-density

gauges.

All holders of OLs or CPs

for nuclear power reactors.

All holders of OLs or CPs

for nuclear power reactors.

All holders of OLs or CPs

for nuclear power reactors.

All licensees who possess

source material.

93-17

93-16

93-15

93-14 OL = Operating License

CP -

Construction Permit

~'-2 IN 93-23 March 31, 1993 To prevent this deficiency in future products, Weschler revised its production

inspection procedures to specifically require checking the dimensions in

question. Weschler also revised its nuclear quality assurance procedures to

require specific checks of torsion head screw dimensions, although the vendor

has not detected a problem with meters manufactured specifically for safety- related applications.

Weschler could not determine whether or not any Model 252 switchboard meters

sold as commercial grade items through the various distributors had been

dedicated for use in nuclear safety-related applications. Therefore, Weschler

has not directly notified any licensees about this problem.

Weschler stated that the principal corrective action it has taken for affected

meters returned for repair and recalibration is to replace the faulty torsion

head screws because they can't be repaired. Upon request, Weschler will give

licensees information about the problem and the recommended corrective

measures.

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.

orig /s/'d by BKGrimes

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contact: S. V. Athavale, NRR

(301) 504-2974 Attachment: % L

List of Receitly Issudd NRC Information Notices

DOCUMENT NAME: 93-2IN

D/DRIL:NRR

D/DRCH:NRR

C/OGCB: DORS:NRR

CERossi

BABoger

GHMarcus

3

03/11/93

02/11/93

03/15/93

OGCB:DORS:NRR*HICB:DRCH:NRR*SC/HICB:DRCH:NRR*C/HICB:DRCH:NRR*RPB:ADM

AJKugler

SVAthavale

JMauck

JWermiel

TechEd

02/08/93

02/10/93

02/08/93

IN 93-XX

March XX, 1993 To prevent this deficiency in future products, Weschler revised its production

inspection procedures to specifically require checking the dimensions in

question. Weschler also revised its nuclear quality assurance procedures to

require specific checks of torsion head screw dimensions, although the vendor

has not detected a problem with meters manufactured specifically for safety- related applications.

Weschler could not determine whether or not any Model 252 switchboard meters

sold as commercial grade items through the various distributors had been

dedicated for use in nuclear safety-related applications. Therefore, Weschler

has not directly notified any licensees about this problem.

Weschler stated that the principal corrective action it has taken for affected

meters returned to it for repair and recalibration is to replace the faulty

torsion head screws because they can't be repaired. Upon request, Weschler

will give licensees information about the problem and the recommended

corrective measures.

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 Suppprt

Office of Nuclear Reactor Regulation

Technical contact:

S. V. Athavale

(301)

504-2974 Attachment: List of Recently Issued NRC Information Notices

D/DORS:NRR

D/DRIL:NRR

D/DRCH:NRR

C/OGCB:DORS:NRR

BKGrimes

CERossi

BABoger

GHMarcu

03/

/93

03/11/93

02/11/93

/ xi 9

OGCB:DORS:NRR*HICB:DRCH:NRR*SC/HICB:DRCH:NRR*C/HICB:DRCH:NRR*RPB:ADM

AJKugler

SVAthavale

JMauck

JWermiel

TechEd

02/08/93

02/10/93

02/08/93

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