ML20214A136

Part 21 Rept Re Capacity of Thermal Compensating Accumulator Being Insufficient to Compensate for Thermal Expansions of Hydraulic Fluid During Full Ambient Temp Transient Required by Customer Specs.Interim & Permanent Mods Identified

ML20214A136
Person / Time
Site:	Seabrook, Comanche Peak, Yankee Rowe, 05000000
Issue date:	05/12/1987
From:	Webb F ROCKWELL INTERNATIONAL CORP.
To:	Murley T NRC
References
REF-PT21-87, REF-PT21-87-120-000 PT21-87-120, PT21-87-120-000, NUDOCS 8705190282
Download: ML20214A136 (12)

Text

.

Measurement & Flow Control DMelon 1900 Soutn Saunem Sea Rockwell nawn.nonncN*$$

International (919)8320525 May 12, 1987 U. S. Nuclear Regulatory Commission Director Office of Inspection & Enforcement Washington, DC 20555 Attention: Mr. Thomas Murley

Subject:

Type A Actuators on Rockwell Main Stream Isolation Valves.

Inadequate Capacity of the Thermal Compensating Acc w ulator.

Reference:

A-260 Actuators at Yankee Atomic Electric, Yankee Statior.

A-260 Actuators at New Hampshire Yankee, Seabrook Station A-180 Actuators at TV Electric, Commanche Peak Station The capacity of the thermal compensating accumulator has been determined to be insufficient to compensate for the thermal expansion of the hydraulic fluid during the full ambient temperature transient required by the custoner specification (s).

Based on the operating conditions, it has been determined that only the referenced utilities are affected. These utilities are being simultaneously notified (see attached letters).

Both interim and permanent modifications have been identified.

If you have any further questions concerning this notice, direct them to me at (919) 831-3300 or Roger D. Norden, Manager, Product Engineering at (919) 831-3207.

(h _

,v F. L. Webb Vice President and General Manager Edward Valve & Die Cast Products Attachment cc:

R. A. Bandukwala D. W. Duffey - Pittsburgh G. E. Hyland R. D. Norden 8705190282 870512 l

PDR ADOCK 05000029 i

S PDR 3023e/eb

)

u eurement a now control oweson nockwes int.masonas corporsson escuensagig Rockwell g

naie.gn.nortn caroiina 27so2 International G19) 8324525 itay 08, 1987 Yankee Atomic Electric Company 1671 Worcester Road Framingham, MA.

01701 Attention: Mr. Louis Heider Manager Operations /Vice President

SUBJECT:

TYPE A ACTUATORS ON ROCKWELL MAIN STEAM ISOLATION VALVES.

INADEQUATE CAPACITY OF THE THERMAL COMPENSATING ACCUMULATOR YANKEE STATION, R0WE, MA.

Reference:

P.O. 277089 - Rockwell S.0. 36-21474 Size 14 Figure 607 NY Globe Valve with A-260 Actuator.

Dear Mr. Heider The purpose of this letter is to inform you that your Rockwell Type A actuator on your Main Steam Insolation Valve requires modification. Until the modification can be uade there is an interim' procedure which will permit you to continue operating the vcive and actuator.

The modification is required to correct a deficiency which relates to the thermal compensating accumulator on your A-260 actuator.

It has been determined that it has insufficient capacity and will not completely compensate for the thermal expansion of the hydraulic fluid. This can cause excessively high hydraulic fluid pressure, which can damage components in the actuator, or possibly inhibit the main dump hydraulfc solenoid valves from shifting.

In the latter case, the actuator would not perform its safety related function.

These adverse pressures will only occur during increasing thermal transients of the ambient environment while the actuator is in the open position.

Typically this could occur during a plant heatup with the valve and actuator opened.

The thermal compensating accumulator is essentially a cylinder with a free floating piston. The gas side is precharged with nitrogen and the other side directly connected to the hydraulic system of the actuator.

It's function is to allow the fluid to thermally expand or contract while maintaining an acceptaole pressure level. Recent field experience, backed up with subsequent testing performed by Rockwell, indicates that the accumulators on your A-260 actuators are insufficient to accommodate the full ambient temperature swings required by your specification.

r

\\

Measurement & Flow Control DMelon RockwellintemetionalCorporsoon

'S* sam s;g*g Rockwell International memn.no,m cm.na mo2 G19)8320$25 TYPE A ACTUATORS ON ROCKWELL i4AIN STEAM ISOLATION VALVES INADEQUATE CAPACITY OF THE THERMAL COMPENSATING ACCUMULATOR Page 2 Our calculations indicate that with the carrent specified nitrogen gas precharge of 2500 psi, the allowable temperature increase is 170F rather than 700F as required by your specification.

This can be increased to 220F Dy., increasing the nitrogen gas precharge to 90% of the hydraulic operating. pressure, in accordance with the attached p~ recharge curve.

Rockwell recomends that the precharge be increased to this new level (see our Instruction Manual for guidance on how to accomplish this).

However, Rockwell will provide the parts and service to modify your A-260 actuators so the original specification requirements of 700F can be achieved.

The modification consists of the ir.stallation of a pressure relief valve in the hydraulic system. We will be ready to review this with you during the last week of May and would like to schedule a meeting for that purpose.

In the meantime, as an interim solution, we recommend that steps be taken to inanitor and control the hydraulic pressures in the actuator. The most expedient solution is to perfor:n an exercise cycle following any increasing thermal transient of 170F. Once thermal equilibrium has been established in the actuator system, there will be no further increase in the fluid pressure.

tly performing an exercise cycle, any excess of fluid volume and pressure will be fully relieved.

We will also be notifying the Nuclear Regulatory Commission concerning this inatter.

i

u ums nowcmen

- in

.w.i cea.n 19msams g slg Rockwell International

% = c n.27eo2 G19) 8324525 TYPE A ACTUATORS ON ROCKWELL MAIN STEAM ISOLATION VALVES INADEQUATE LAPACITY OF THE THERMAL COMPENSATING ACCUMULATOR Page 3 These letters are being hand delivered by Albert C. Cooper your local Rockwell Representative, because of the importance of this matter.

If you have any further questions concerning this notice, direct them to myself at (919) 831-3300, or Roger D. Norden, Product Engineering Manager, at (919) 831-3207.

Very truly yours, an F. L. Webb Vice President and General Manager Edward Valve & Die Cast Products FLW/cdv

Attachment:

Precharge curve for Thermal Compensating Accumulator, cc: 11r. John D. Haseltine Yankee Atomic Electric Company Framingham, MA.

01701 Mr. Norman Laure.nt and Mr. Robert Mitchell Yankee Atomic Electric Company Star Route Rowe, MA.

01367 Mr. Albert C. Cooper

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Measu ement & Flow Cor. trol DMelon

' Rockwell Intemational Corporation 1900 South Saunders Street Rockwell P.O. Box 1961 Rale @, North Carohna 27602 International (919) 832<>525 l

l l

May 08, 1987 New Hampshire Yankee i

Box 700 Mail Code 0140 Seabrook, New Hampshire 03874 Attention: Mr. George Thomas Vice President Nuclear Production

SUBJECT:

TYPE A ACTUATORS ON ROCKWELL MAIN STEAM ISOLATION VALVES.

INADEQUATE CAPACITY OF THE THERMAL COMPENSATING ACCUMULATOR

Reference:

P.O. SNH-590-9763.006-248 Rockwell S.0. 36-21863 Size 30 X 24 X 30 Figure 1911 (WCC)DGJMMNPQTY Gate Valve with A-260 Actuator Dear Mr. Thomas l

The purpose of this letter is to inform you that your Rockwell Type A actuator on your Main Steam Insolation Valve requires modification. Until the l

modification can be made there is an interim procedure which will permit you to continue operating the valve and actuator.

The modification is required to correct a deficiency which relates to the thermal compensating accumulator on your A-260 actuator.

It has been determined that it has insufficient capacity and will not completely compensate for the thermal expansion of the hydraulic fluid.

This can cause l

excessively high hydraulic fluid pressure, which can damage components in the actuator, or possibly inhibit the main dump hydraulic solenoid valves from shifting.

In the latter case, the actuator would not perform its safety l

related functicn.

These adverse pressures will only occe dui ing increasing thermal transients of the ambient environment while t'm, w

>r is in the open position.

Typically this could occur during,,,le

,tatup with the valve and actuator opened.

Tae thermal compensating accumulator is essentially a cylinder with a free floating piston. The gas side ir precharged with nitrogen and the other side directly con.1ected to the hydrauiic system of the actuator.

It's function is

Meesurement & Flow Control Division RockwellIntemational Corporation

'S* Souta Saua" Stra' Rockwell P.O. Box 1961 naie,an. no,1n carana neo2 International (919)8324525 l

TYPE A ACTUATORS ON ROCKWELL I4AIN STEA'i ISOLATION VALVES INADEQUATE CAPACITY OF THE THERf4AL COMPENSATING ACCUtiULATOR Page 2 to allow the fluid to thermally expand or contract while maintaining an acceptable pressure level. Recent field experience, backed up with subsequent testing performed by Rockwell, indicates that the accumulators on your A-260 actuators are insufficient to accommodate the full ambient temperature swings required by your specification.

Our calculations indicate that with the current specified nitrogen gas precharge of 2500. psi, the allowable temperature increase is 100F rather than 700F as require'd by your specification. This can be increased somewhat to 130F by increasing the nitrogen gas precharge to 90% of the hydraulic operating pressure, in accordance with the attached precharge curve. Rockwell recommends that the precharge be increased to this new level (see our Instruction 11anual for guidance on how to accomplish this).

However, Rockwell will provide the parts and service to modify your A-260 actuators so the original specification requirements of 700F can be achieved.

The modification consists of the installation of a pressure relief valve in the hydraulic system. We will be ready to review this with you during the last week of May and would like to schedule a meeting for that purpose.

In the meantime, as an interim solution, we recommend that steps be taken to monitor and control the hydraulic pressures in the actuator.

The most l

expedient solution is to perform an exercisa cycle following any increasing thermal transient of l@F. Once thermal equilibrium has been established in the actuator system, there will be no further increase in the fluid pressure.

By performing an exercise cycle, any excess of fluid volume and pressure will be fully relieved.

We will also be notifying the Nuclear Regulatory Commission concerning this matter.

Measurement & Flow Control DMalon RockweH InternationalCorporation

" Souta Saua*'5 "

Rockwell P.O. Box 1961 International Ralegh, North Carolina 27602 (919)832O525 TYPE A ACTUATORS ON ROCKWELL I4AIN STEAM ISOLATION VALVES INADEQUATE CAPACITY OF THE THERl1AL COMPENSATING ACCUMULATOR Page 3 These letters are being hand delivered by Albert C. Cooper your local Rockwell Representative, because of the importance of this matter.

If you have any further questions concerning this notice, direct them to myself at (919) 831-3300, or Roger D. Norden, Product Engineering Manager, at (919) 831-3207.

Very truly yours, M< <w F. L. Webb '

Vice President and General Manager Edward Valve & Die Cast Products FLW/cdv

Attachment:

Precharge curve for Thermal Compensating Accumulator, cc: Mr. Donald d. Moody -

Mr. Paul Searfoorce Mr. Albert C. Cooper 4290b

Flow REPORT NO:

Rockwell Control REV:

DATE:

International Division PAGE OF O

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Measurement & Flow Control DMalon Rockwell International Corporatlon

'S* Soum sags'g Rockwell International naie#. norm caronn. 27eo2 (919)8324525 day 08, 1937 T U Electric Company P. O. dox 1002 Glen Rose, TX 76043 Attention: Ar. Larry Nance Vice President Engineering SU3 JECT:

TYPE A ACTUATORS ON ROCKWELL MAIN STEAM ISOLATION VALVES.

INADEQUATE CAPACITY OF THE THERotAL COMPENSATING ACCUMULATOR

Reference:

P.O. CPF-10332-S-Rockwell S. O. 36-28048 Size 32 X 32 X 34 Figure 612 (WCC)GJMMPTY Globe Valve with A-180 Actuator

Dear !!r. Nance:

The purpose of this letter is to inform you that your Rockwell Type A actuator on your liain Steam Insolation Valve possibly requires oodification. Until a determination can be made there is an interim procedure which will permit you to continue operating the valve and actuator.

The modification would correct a deficiency which relates to the thermal compensating accuiaulator on your A-180 actuator.

It has been determined that it will not completely compensate for the thermal expansion of the hydraulic fluid.

This can cause excessively high hydraulic fluid pressure, which can damage components in the actuator, or possibly inhibit the main dump hydraulic solenoid valve, from shifting.

In the latter case, the actuator would not perform its safety related function.

These adverse pressures will only occur during increasing thermal transients of the ambient environment while the actuator is in the open position.

Typically this could occur during a plant heatup with the valve and actuator opened.

The thermal compensating accumulator is essentially a cylinder with a free floating piston.

The gas side is precharged with nitrogen and the other side directly connected to the hydraulic system of the actuator.

It's function is to allow the fluid to thermally expand or contract while maintaining an acceptable pressure level. Recent ffeld experience, backed up with subsequent testing performed by Rockwell, indicates that the accumulators on your A-180 actuators are insufficient to accommodate the full ambient temperature swings required by your specification.

s Measurement & Flow Control DMelon RockwellIntemational Corporation

'9m Sam sygS,'g Rockwell International uo an.no,in ce.na mo2 (919)8324525 TYPE A ACTUATORS ON ROCKWELL MAIN STEAM ISOLATION VALVES INADEQUATE CAPACITY OF THE THERi1AL COMPENSATING ACCUMULATOR Page 2 Our calculations indicate that with the current specified nitrogen gas precharge of 1325 psi, the allowable temperature increase is 340F rather than 800F as required by your specification.

This can be increased to 550F by increasing the nitrogen gas precharge to 90% of the hydraulic operating pressure, in accordance with the attached precharge curve.

Rockwell recommends that the precharge be increased to this new level (see our Instruction Manual for guidance on how to accomplish this).

However, Rockwell can provide the parts and service to modify your A-180 actuators so the original specification requirements of 800F can be achieved.

The modification consists of the installation of a pressure relief valve in the hydraulic system. We will be ready to review this with you during the last week of May.and would like to schedule a meeting for Should y~u determine that 550F is acceptable, of course, that purpose.

o then no equipment inodification will be necessary.

In the meantime, as an interim solution, we recoumend that steps be taken to monitor and control the hydraulic pressures in the actuator. The most expedient solution is to perform an exercise cycle following any increasing thermal transient of 340F. Once thermal equilibrium has been established in the actuator system, there will be no further increase in the fluid pressure.

By performing an exercise cycle, any excess of fluid volume and pressure will be fully relieved.

We will also be notifying the Nuclear Regulatory Commission concerning this matter.

These letters are being hand delivered by Robert C. Hicks your local Rockwell Representative, because of the importance of this matter.

If you have any further questions concerning this notice, direct them to myself at (919) 831-3300, or Roger D. Norden, Product Engineering Manager, at (919) 831-3207.

Very truly yours, F. L. Webb Vice President and General Manager Edward Valve & Die Cast Products FLW/cdv Attachinent:

Precharge curve for Thermal Compensating Accumulator.

cc: Richard P. Baker-T U Electric Company Robert C. Hicks

1 I

Fl* w REPORT NO:

i Rockwell control REV:

DATE:

[ritt!1rt1Elli()l1 Ell e

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