Information Notice 1994-67, Problem with Henry Pratt Motor-Operated Butterfly Valves

Problem with Henry Pratt Motor-Operated Butterfly Valves

ML031060541
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:	09/26/1994
From:	Grimes B Office of Nuclear Reactor Regulation
To:
References
IN-94-067, NUDOCS 9409200069
Download: ML031060541 (8)

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7 agreed, UNITED STATES

NUCLEAR REGULATORY COMMISSION

OFFICE OF NUCLEAR REACTOR REGULATION

WASHINGTON, D.C. 20555 September 26, 1994 NRC INFORMATION NOTICE 94-67: PROBLEM WITH HENRY PRATT MOTOR-OPERATED

BUTTERFLY VALVES

Addressees

All holders of operating licenses or construction permits for nuclear power

reactors.

Purpose

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

notice to alert addressees to a problem with Henry Pratt motor-operated

butterfly valves that can lead to the decoupling of the valve operator from

the valve stem. 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 October 17, 1993, the Duquesne Light Company conducted a full flow

surveillance test on a recirculation spray pump at Beaver Valley Power

Station, Unit 2. The pump did not establish adequate flow or discharge

pressure during the test. The licensee found that the pump suction valve was

shut, though the annunciator in the control room indicated it fully open. As

the result of the investigation, the licensee found that the valve operator

had decoupled from the valve stem, allowing the operator to move independently

of the valve. Two of the three other recirculation pump suction valves were

starting to decouple because the valve spline adapters separated from the

operator drive sleeves.

On December 10, 1993, the licensee reported to NRC in accordance with the

requirements of 10 CFR Part 21, "Reporting of Defects and Noncompliance,",that

the recirculation pump suction valve disc could disengage from the motor- operator which could cause the recirculation spray system to operate in an

unacceptable manner.

Discussion

The recirculation spray pump suction valves at Beaver Valley Unit 2 are

12 inch nominal size Henry Pratt 1400 series butterfly valves with Limitorque

HBC-1 operators. The drive sleeve on a Limitorque HBC valve operator rotates

a spline adapter. The spline adapter is keyed to the valve stem, but the key

does not prevent the adapter from moving down the valve stem toward the valve.

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IN 94-67

• j _>September 26, 1994 If the spline adapter slips down the valve stem, it will disconnect from the

drive sleeve. On a Henry Pratt valve, the spline adapter is held in position

by an adapter plate, which is designed to permit passage of the valve stem, but not the spline adapter. Additionally, the valve bonnet plate, which is

located below the adapter plate, isT designed the same way. The adapter plates

and bonnet plates were designed and manufactured by Henry Pratt.

Duquesne Light Company found that the center holes in the valve bonnet plates

and adapter plates were about 1.3 cm (0.5 inches] larger (in diameter) than

the corresponding design dimensions. This was sufficient to allow the spline

adapters to slip down the valve stem during operation of the valve. This is

shown in Figure 1.

The licensee checked all 54 Henry Pratt butterfly valves at the Beaver Valley

Nuclear Power Station for proper adapter plate and bonnet plate dimensions.

No problems were noted beyond the recirculation pump suction valves. The

licensee placed temporary spline adapter retaining clamps on the recirculation

spray pump suction valves pending permanent modification.

Related Generic Communications

The NRC discussed a separate root cause of decoupling of a valve from its

motor-operator in NRC Office of Inspection and Enforcement (I&E) Circular

80-12, "Valve-Shaft-to-Actuator Key May Fall Out of Place When Mounted Below

Horizontal Axis," dated May 14, 1980, and I&E Information Notice 85-67,

"Valve-Shaft-to-Actuator Key may fall out of Place When Mounted Below

Horizontal Axis," dated August 8, 1985.

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 orig /s/'d by CIGrimes/for

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contacts: Scot A. Greenlee, RI Thomas G. Scarbrough, NRR

(412) 643-2000 (301) 504-2794 Attachments:

1. Figure 1 - Henry Pratt Butterfly Valves With Limitorque Motor Operator

2. List of Recently Issued NRC Information Notices

• see WDLanning memo to AJKugler date May 26, 1994 AcA(PI W-rs

and Drevious concurrence sheets DOCUMENT NAME: 94-67.IN M'iLtR )ir.r7uKUT

.,

OFFICE *Region I *Region I *Region I *OGCB/NRR

NAME SAGreenlee I JCLinville WDLanning RJKiessel

DATE 7/13/94 [ 5/25/94 5/25/94 J 7/11/94 OFFICE *Tech. Ed. *EMEB/NRR *C:EMEB/NRR l*D:DE/NRR

NAME l JMain TGScarbrough RHWessman BWSheron

DATE [7/12/94 l 7/31/94 J 8/ 2/94 l 8/ 9/94 jD:DORS/NRR

OFFICE

NAME

DATE

• C:RVIB/NRR

LJNorrholm

8/ 8/94

• D:DRIL/NRR

18/

CERossi

9/94 J

1

• C:OGCB/NRR

ELDoolittle

8/20/94 BKGrimes il

1 09/7P/94 V

V Attachnent 1 IN 94-67 September 26, 1994 Figure 1 Henry Pratt Butterfly Valve

with Limitorque Motor Operator

Attachment 2 IN 94-67 September 26, 1994 LIST OF RECENTLY ISSUED

NRC INFORMATION NOTICES

Information Date of

Notice No. Subject Issuance Issued to

94-66 Overspeed of Turbine- 09/19/94 All holders of OLs or CPs

Driven Pumps Caused by for nuclear power reactors.

Governor Valve Stem

Binding

94-65 Potential Errors in 09/12/94 Al U.S. Nuclear Regulatory

Manual Brachytherapy Commission medical

Dose Calculations licensees.

Generated Using a

Computerized Treatment

Planning System

94-64 Reactivity Insertion 08/31/94 All holders of OLs or CPs

Transient and Accident for nuclear power reactors

Limits for High Burnup and all fuel fabrication

Fuel licensees.

94-63 Boric Acid Corrosion of 08/30/94 All holders of OLs or CPs

Charging Pump Casing for pressurized water

Caused by Cladding Cracks reactors.

94-62 Operational Experience 08/30/94 All holders of OLs or CPs

on Steam Generator Tube for pressurized water

Leaks and Tube Ruptures reactors.

94-61 Corrosion of William 08/25/94 All holders of OLs or CPs

Powell Gate Valve Disc for nuclear power reactors.

Holders

94-60 Potential Overpressuriza- 08/22/94 All holders of OLs or CPs

tion of Main Steam System for pressurized-water

reactors.

94-30, Leaking Shutdown Cooling 08/19/94 All holders of OLs or CPs

Supp. 1 Isolation Valves at for nuclear power reactors.

Cooper Nuclear Station

94-59 Accelerated Dealloying of 08/17/94 All holders of OLs or CPs

Cast Aluminum-Bronze for nuclear power reactors.

Valves Caused by Micro- biologically Induced

Corrosion

OL = Operating License

CP = Construction Permit

IN 94-XX

July 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 contacts: Scot A. Greenlee, Region I

(412) 643-2000

Thomas G. Scarbrough, NRR

(301) 504-2794 Attachments:

1. Figure 1 - Henry Pratt Butterfly Valves With Limitorque Motor Operator

2. List of Recently Issued NRC Information Notices

• see WDLanning memo to AJKugler date May 26, 1994 and previous concurrence sheets

OFFICE *Region I *Region I *Region I *OGCB/NRR

NAME SAGreenlee JCLinville WDLanning RJKiessel

DATE 7/13/94 5/25/94 5/25/94 7/11/94 OFFICE *Tech. Ed. *EMEB/NRR *C:EMEB/NRR *D:DE/NRR

NAME JMain TGScarbrough RHWessman BWSheron

DATE 7/12/94 7/31/94 8/ 2/94 8/ 9/94 OFFICE_ *C:RVIB/NRR *D:DRIL/NRR C B/NRRD:DORS/NRR

NAME LJNorrholm RLSpessard i ttle BKGrimes

DATE 8/ 8/94 8/ 9/94 8/ /94 8/ /94 Document Name: G:\RJK\NRCINS\NRCIN.461

IN 94-XX

July 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 contacts: Scot A. Greenlee, Region I

(412) 643-2000

Thomas G. Scarbrough, NRR

(301) 504-2794 Attachments:

1. Figure 1 - Henry Pratt Butterfly Valves With Limitorque Motor Operator

2. List of Recently Issued NRC Information Notices

• see WDLanning memo to AJKugler date May 26, 1994 and previous concurrence sheets

OFFICE J *Region I *Region I *Region I *OGCB/NRR

NAME SAGreenlee JCLinville WDLanning RJKiessel

DATE 7/13/94 5/25/94 5/25/94 7/11/94 OFFICE *Tech. Ed. EMEQ0_ C:E /K l -RR Wf C-

.1-t

NAME JMain TGScarough RHWAlSan l j 94-P

DATE 7/12/94 7/51/94 1p-9/94 /g/94 OFFICE C:q I I/NRRD:DRIL/NRR C:OGCB/NRR D:DORS/NRR

NAME olin ELDoolittle BKGrimes

DATE Y/7

94 / 94 7/ /94 7/ /94 Document Name: G:\RJK\NRCINS\NRCI .461

Technical contact(s): Scot A. Greenlee, Region I

(412) 643-2000

Thomas G. Scarbrough, NRR

(301) 504-2794 Attachments:

1. Figure 1 - Henry Pratt Butterfly Valves With Limitorque Motor Operator

2. List of Recently Issued NRC Information Notices

• see WDLanning memo to AJKugler date May 26, 1994 and previous concurrence sheets

OFFICE Region I Region I Region I OGCB/NRR_

NAME SAGreenlee JCLinville WDLanning RJKiess4 K

DATE 5/ /94 5/ /94 5/ /94 7/11/9 OFFICE Tech. Ed. EMEB/NRR C:EMEB/NRR D:DE/NRR

NAME _____ 9 _ TGScarbrough RHWessman BWSheron

DATE 7/12 /94 7/ /94 7/ /94 7/ /94 OFFICE C:RVIB/NRR D:DRIL/NRR C:OGCB/NRR D:DORS/NRR

NAME LJNorrholm CERossi ELDoolittle BKGrimes

DATE 7/ /94 7/ /94 7/ /94 7/ /94 Document Name: G:\RJK\NRCINS\NRCIN.461

IN 94-67 September 26, 1994 If the spline adapter slips down the valve stem, it will disconnect from the

drive sleeve. On a Henry Pratt valve, the spline adapter is held in position

by an adapter plate, which is designed to permit passage of the valve sLem, but not the spline adapter. Additionally, the valve bonnet plate, which is

located below the adapter plate, is designed the same way. The adapter plates

and bonnet plates were designed and manufactured by Henry Pratt.

Duquesne Light Company found that the center holes in the valve bonnet plates

and adapter plates were about 1.3 cm [0.5 inches] larger (in diameter) than

the corresponding design dimensions. This was sufficient to allow the spline

adapters to slip down the valve stem during operation of the valve. This is

shown in Figure 1.

The licensee checked all 54 Henry Pratt butterfly valves at the Beaver Valley

Nuclear Power Station for proper adapter plate and bonnet plate dimensions.

No problems were noted beyond the recirculation pump suction valves. The

licensee placed temporary spline adapter retaining clamps on the recirculation

spray pump suction valves pending permanent modification.

Related Generic Communications

The NRC discussed a separate root cause of decoupling of a valve from its

motor-operator in NRC Office of Inspection and Enforcement (I&E) Circular

80-12, "Valve-Shaft-to-Actuator Key May Fall Out of Place When Mounted Below

Horizontal Axis," dated May 14, 1980, and I&E Information Notice 85-67,

"Valve-Shaft-to-Actuator Key may fall out of Place When Mounted Below

Horizontal Axis," dated August 8, 1985.

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, DirectoX"

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contacts- Scot A. Greenlee, RI

(412) 643-2000

Thomas G. Scarbrough, NRR

(301) 504-2794 Attachments:

1. Figure 1 - Henry Pratt Butterfly Valves With Limitorque Motor Operator

2. List of Recently Issued NRC Information Notices