Text

Forwards Final Response to Action Items Contained in IE Bulletin 85-003 Re motor-operated Valve Common Mode Failure During Plant Transients Due to Improper Switch Settings. Applicable HPI & Emergency Feedwater Sys Valves Listed
	ML20245C037
Person / Time
Site:	Crane
Issue date:	06/25/1987
From:	Hukill H; GENERAL PUBLIC UTILITIES CORP.
To:	; NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
	5211-87-2105, IEB-85-003, IEB-85-3, NUDOCS 8707010596
	Download: ML20245C037 (11)
	v • d • e

_ - _. - _ _ _ _ _ _ - _ -

GPU Nuclear Corporation l,",,,.ti Nuclear

,omgreo Middletown, Pennsylvania 17057 0191 717 944 7621 TELEX 84 2386 Writer's Dirset Dial Numter; June 25, 1987 5211-87-2105 i

U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 Gentlemen:

Three Mile Island Nucle &r Station, Unit 1 (TMI-1)

Operating License No. DPR-50 Docket No. 50-289-Final Response to IE Bulletin 85-03 This letter provides the final response to the action items contained in IE Bulletin 85 Motor Operated Valve Common Mode Failures During Plant Transients Due to Improper Switch Settings.

I Sincerely, H. D. f ki.1 Vice President & Director, TMI-1 HDH/DVH/spb:0884A I

cc:

W. T, Russell R. J. Conte

{g7010596870625 ADOCK 05000287 g

PDR Sworn and subscribed ()to before me this c.150 day of uML, 1987.

ALM f.,hLW7L)

/

Notary Public SilAltoft P. BROWN, ficIARY Puut,tc ElDOLEltW!N B020, DAUP!!!fd C0!Nifi IF.Y COMAtISS10N EXPi8f 5 JUNE 12. It09 kmhu. Punsytysala Apostlan of #pteles ph GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation.

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IE BULLETIN 85-03 MOTOR OPERATED VALYE COMMON MODE FAILURES DURING PLANT TRANSIENTS DUE TO IMPROPER SWITCH SETTING l

FINAL WRITTEN REPORT FOR l

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THREE MILE ISLAND, UNIT 1 JUNE 1967 i

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' A_ctions for All Holders of Operating Licenses or Construction Permits:

For motor-operated valves in the high pressure coolant injection / core spray-and emergency'feedwater systems (RCIC for BWRs) that are required to be tested for operation,al readiness in accordance with ~10 CFR 50.55a(g),. develop:and implement a ; program to ensure that valve operator switches are selected, set and naintained properly.

. 3

Response

1 Using the above criteria, GPU Nuclear (GPUN) reviewed the High Pressure Injection (HPI) System, and Emergency Feedwater Systems and determined the following ? valves were applicable.

i High Pressure Injection (HPI) System

~

MU-V-14 A, B - MU Pump Suction From BWST MU-V-16 A, B, C & D - High Pressure Injection

- l MU-V HU Pump Recirculation MU-V MU Pump Recirculation Steam Supply to Emergency Feedwa'er Turbine t

MS-V-2 A, B - Steam Dump Header Supply MS-Y-10 A, B - EFW Purnp Steam Supply

{

In addition, the following valves in the HPI and EFW System have Imotor operators but are lockrJ closed and/or are not expected to operate in ar..

i emergency condition.

sherefore,-these valves are not considered to be within the scope of this bulletin.

1 MU-Y-12 (not expected to operate in an emergency condition)

EF-V-4, 5 (1ocked closed)

These are the motor operated valves which are-in the referenced systems and are in the GPUN Inservice Testing ProDram (10 CFR 50.55a(g)).

_I?B Action Item A:

Review and document the design basis for the operation of each valve. This documentation should include the maximum differential pressure expected during both opening and closing the velve for both normal and abnormal events to the extent that these valve operations and events are included in the _ existing, apprsved design basis (i.e., the design basis documented in pertinent licensee submittals such as FSAR analyses and fuliy-approved operating and emergency _

t procedures, etc.). ' When determining the. maximum differential pressure, those single equipment failures and inadvertent equipment operations (such as inadvertent valve closures or openings) that are withf'n the plant design basis should be-assumed.

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Response to Item A:

i GPUN performed this review of the above noted valves.

The results of this review are contained in Attachment 1.

IEB Action Item B.:

Using the results from Item A above, establish tM correct switch settings.

This shall include a progrem to review and revis as necessary, the methods for selecting and settin.g all switches (i.e., te,ue, torque bypass, position limit,. overload) for each valve operation (opening and closing).

If the licensee determines that a valve is inoperable, the licensee shall also make.an appropriate justification for continued operation in accordance with the applicable technical specification.

Response to Item B:

i 1.

GPUN contracted Torrey Pines Technologies (TPT) to calculate the required thrust values for motor operated gate and globe valves. M0 VATS (Motor i

Operated Valve Analysis and Test System) was used to determine the torque switch setting that provided the required thrust, In addition, the bypass limit switch settings were verified or corrected using the MOVATS test equipment.

J J

2.

The current method used to size thermal overload heaters was reviewed and determined to be satisfactory.

)

IE8 Action Item C:

Individual valve settings shall be changed, as appropriate, to those established in Item B above, Whether the valve setting is changed or not, the

)

j valve will be demonstrated tc be operable by testing the valve at the maximum i

differential pressure determined in Item A above with the exception that l

testing motor-operated valves under conditions simulating a break in the line i

containingi the valve is not required.

Otherwise, justification should be I

provided for any caser where testing with the maximum differential pressure

)

cannot practicably be performed.

This justification should include the alternative to maximum differential pressure testing which will be used to verify the correct settings, i

Each valve shall be stroke tested, to the extent practical, to verify that the settings defined in Item B above have been pronerly implemented even if testing with differential pressure cannot be performed.

Response to Item C:

l All of these valves were MOVATS tested and the settings were chd ged as i

necessary.

The results are contained in Attachment 4.

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The results of the above were reviewed and it was concluded that the as-found conditions did not produce results which were determined to be reportable or made the valves inoperable.

GPUN has reviewed the IE Bulletin requirement to demonstrate the valve to be operable by testing the valve at the maximum differential pressure and provides the following, j

MU-Y16A/B/C/D and ML'-V36/37 are functionally tested under conditions that simulate the differential pressure expected for an accident function (SP 1303-5.2 and.SP 1303-11.8).

The Maintenance Department has been provided with minimum torque switch settings for each valve and instructed not to set the torque switch below.the minimum value witnout Plant Engineering approval.

GPUN believes that the calculation, and quantitative verific.ation of the torque switch setpoint (currently MOVATS testing) provides sufficient assurance that the valves will perform their safety function..

No special differential pressure testing is p'lanned.

IEB Action Item D:

Prepare or revise procedures to ensure that correct switch settings are determined and maintair.ed throughout the life o' the plant.

Ensure that applicable indu:,try recommendations are considered in the preparation of these procedures.

This item is intended to be completely consistent with Action Item 3.2,

" Post-Maintenance Testing (All Other Safety-Related Components)," of Generic Letter 83-28, " Required Actions Based on Generic Implications of Salem ATWS Events." These procedures should include provisions to monitor valve performance to ensure the switch settings are correct. This is particularly important if the torque or torque bypass switch setting has been significantly raised above that required.

Response to Item D:

GPUN procedures used to ensure the correct switch settings are maintained and consist of the following:

1420-LTQ-1 Troubleshooting Limitorque Valve Operators and Control Circuits, Removal and Replacement of Limitorque Valve Operators 1420-LTQ-2 Limitorque Operator, Limit Switch and Torque Switch Adjostment i

i 1420-LTQ-7 Procedure for Testing Various Motor Operated Valves Usitag tne I

M0 VATS - 2100/2150 System l

E-13 Limitorque Valves..

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Action Item E:

Within 180 days of the date of this bulletin, submit a written report to the NRC that:

(1)- reports the results of Item A and (2) contains the program to accorplish Items B. through D above including a schedule for completion of these items.

Respcnse to Item E:

This tras completed in GPUN letter no. 5211-86-2084 ' dated May 27, 1986.-

Actior Item F:

Provide a written report on completion of the above program. This report should provide (1) a verification of completion of the requested program, (2)

.a summary of the findings as to valve operability prior to any adjustment as a result of this bulletin, and. (3) a summary of data in accordance with Table 2, Suggested Data Summary Format.. The NRC staff intends to use this data to assist in the resolution of Generic Issue II.E.6.1.

This report shall be ~

submitted to the NRC within 60 days of completion of the program.. Table 2 should be expanded, if appropriate, to include a summary of all datta required to evaluate the response to this bulletin.

Response to Item F:

This letter contains the Final Written Report for IEB 85-03. The summary of information as requested in the IEB, Table 2 has been divided into these attachments:

Valve Information Operator Information i

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ATTACHMENT 4 PAGE 2 of 2

)

NOTES 1

NOTE 1:

Thermal Overload heaters are sized to allow 300% of rattd current for the stroke time of the valve.

This criteria previocsly applied i

only to valves receiving an.ES signal.

MS-V2A overload had to be j

changed to meet the new criteria, i

i NOTE 2:

The as-found torque switch settings for MS-V2A exceeded the nominal operator thrust rating of 45,000 pounds (closing was approximately 46,450, opening approximately 48,800).

No damage to tne valve or operator was found, i

NOTE 3:

MS-V-28: As found closing thrust was below target.

The calculated minimum closing thrust was 29,64il pounds.

The operator was delivering 14,600 pounds of thrunt at torque switch trip. The torque switch was increased to deliver 35,573 pounds thrust.

NOTE 4:

MU-V-148: As found inadvertent backseating. The open limit switch was adjusted to alleviate the backseating condition.

NOTE 5:

MU-V-16A:

Cound not connect load cell.

Operator adjustments based i

on worst case conditions for similar valves.

NOTE 6:

MU-V-36 and MU-V-37:

Close torque swit::h settings were found below the minimum of 3,664 pounds thrust.

(MU-V36-3275 pounds, MU-V37-3190 pounds).

Both of these vailves have been previously tested with differential pressure and have operated successfully.,

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ML20245C037

Text

Response

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