ML20198R339

Responds to IE Bulletin 85-003, Motor-Operated Valve Common Mode Failures During Plant Transients Due to Improper Switch Settings. Program Will Be Implemented to Establish Correct Switch Settings for Valves

ML20198R339
Person / Time
Site:	Maine Yankee
Issue date:	06/04/1986
From:	Randazz J, Randazza J, Randazzo J Maine Yankee
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
7519L-SDE, IEB-85-003, IEB-85-3, MN-86-66, NUDOCS 8606100038
Download: ML20198R339 (7)

Text

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MA!RE HARHEE ATOMICPOWERCOMPARSe avaus,aj,in"g%a's (207) 623-3521 e

June 4, 1986 MN-86-66 Region I United States Nuclear Regulatory Commission Office of Inspection and Enforcement 631 Park Avenue King of Prussia, Pennsylvania 19406 Attention: Dr. Thomas E. Murley, Regional Administrator

References:

(a) License No. DPR-36 (Docket No. 50-309)

(b) USNRC IE Bulletin No. 85-03: Motor-0perated Valve Common Mode Failures During Plant Transients Due to Improper Switch Settings dated November 15, 1985

Subject:

Response to IE Bulletin 85-03 Gentlemen:

IE Bulletin 85-03 deals with a particular common mode failure (improper torque switch bypass limit settings) on MOVs in the High Pressure Coolant Injection / Core Spray and Emergency Feedwater systems (RCIC for BWRs). The Maine Yankee plant is a Combustion Engineering Pressurized Hater Reactor (PHR) and has no RCIC or core spray systems. In addition, the Emergency Feedwater System contains no MOVs which are required to operate during transients.

In response to your request for information, Attachment A contains information on the maximum differential pressures for the operation of the motor operated valves (HOVs) in the Maine Yankee plant's High Pressure Safety Injection System as requested in item a of Reference (b) and also provides our plans for addressing items b-d.

The high pressure coolant injection function is provided by the High Pressure Safety Injection (HPSI) System. The HPSI System consists of the plant charging pumps, valvas and piping to enable these pumps to be changed from their normal operational duties to those required by accident conditions. In the recirculation mode, the Containment Spray System provides suction to the HPSI System, and as such, has been included in the review.

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MAINE YANKEE ATOMIC POWER COMPANY United States Nuclear Regulatory Commission Page Two Attention: Dr. Thomas E. Murley, Regional Administrator NN-86-66 He trust this information is complete and satisfactory. If you have any questions, please do not hesitate to contact us.

Very truly yours, MAINE YANKEE ATOMIC POWER COMPANY W -

John B. Randazza Executive Vice President JBR/bjp

Attachment:

(5 Pages) cc: Mr. Ashok C. Thadani Document Control Desk Mr. Cornelius F. Holden Mr. Pat Sears STATE OF MAINE Then personally appeared before me, John B. Randazza, who being duly sworn did state that he is Executive Vice President of Maine Yankee Atomic Power Company, that he is duly authorized to executt and file the foregoing response in the name and on behalf of Maine Yankee Atomic Power Company, and that the statements therein are true to the best of his knowledge and belief.

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ATTACHMENT A TO MN-86-66 i

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IEB 85-03 I For motor-operated valves in the high pressure coolant injection / core

! spray and emergency feedwater systems (RCIC for BHRs) that are required

! to be tested for operational readiness in accordance with 10 CFR 50.55a(g), develop and implement a program to ensure that valve

, operator switches are selected, set and maintained properly. This should include the following components:

, 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 valve for both normal and abnormal events to the extent that these valve operations ,

and events are included in the existing, approved design basis, 1 (i.e., the design basis documented in pertinent licensee submittals such as FSAR analyses and fully-approved operating and emergency j procedures, etc.). When determining the maximum differential pressure, those single equipment failures and inadvertent equipment j operations (such as inadvertent valve closures or openings) that are within the plant design basis should be assumed.

i Maine Yankee Resoonse The high pressure coolant injection function is provided by the High Pressure Safety Injection . System (HPSI). The HPSI System consists of the plant charging pumps, valves and piping to enable these pumps to be changed from their normal operational duties to those required for accident conditions. In the recirculation mode, the Containment Spray i System provides suction to the HPSI System. These systems are described in Section 6.0, " Engineering Safeguards," of the FSAR.

! The HPSI System has been reviewed to identify the MOVs which are subject

{ to the concerns expressed in Reference (b). All MOVs identified in

response to the bulletin are shown on Figure 6.3-1 of the Maine Yankee FSAR. M0V's in the HPSI System, and in the Containment Spray System

whh.h support HPSI System operation, were reviewed in accordance with the guidelines of IE Bulletin 85-03.

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Table 1 lists the valves by name and number, and provides the maximum  !

differential pressure requirements. Where the numbering system used by  ;

4 Maine Yankee differs from that used by Combustion Engineering or Stone and Hebster, both numbers are given.

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I IEB 85-03 a '

b. Using the results ,from item (a) above, establish the correct switch settings. This'shall include a program to review and revise, as necessary, the methods for selecting and setting all switches (i.e.,

torque, 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 thei applicable technical specification.

Maine Yankee Response

1. Maine Yankee will implement a program to establish the correct switch settingst for the valves listed in Table 1 by January 1, i 1987.

IEB 85-03

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 valve will be descastrated to be operable by testing the valve at the maximum differential pressure determined in item (a) above with the exception that testing motor-operated valves under conditions simulating a break in the line containing the valve is not required. Otherwise, justification should be provided for any cases where testing with the maximum differential pressure cannot practicably be performed. This justificaticn should include the alternative to maximum differential pressure testing which will be used to verify the correct settings.

Note: This bulletin is not intended to establish a requirement for valve testing for the condition simulating a break in the line containing the valve. However, to the extent that such valve operation is relied upon in the design basis, a break in the line containing the valve should be considered in the analyses prescribed in items (a) and (b) above. The resulting switch settings for pipe break conditions should be verified, to the extent practical, by the same methods that would be used to verify other settings (if any) that are not tested at the maximum differential pressure.

Each valve shall be stroke tested, to the extent practical, to verify that the settings defined in item (b) above have been properly implemented even if testing with differential pressure can not be performed.

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. , MAINE VANKEE ATOMIC POWER COMPANY Maine Yankee ResDonse

2. Maine Yankee will demonstrate the operability of the valves by testing the valve at the maximum differential pre:sure listed in Table 1, if practical. Alternative methods to verify correct switch settings will be established where testing is impractical. This will be completed by July 1, 1987.

IEB 85-03

d. Prepare or revise procedures to ensure that correct switch settings are determined and maintained throughout the life of the plant.

Ensure that applicable industry recommendations are considered in the preparation of these procedures.

Maine Yankee ResDonse

3. Procedures will be revised by September 1, 1987 to ensure that the switch settings are correct and are maintained.

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, ,, M AINE YANKEE ATOMIC POWER COMPANY TABLE 1. MAINE YANKEE POTOR OPERATED VALVES (HOVs) IDENTIFIED FOR IE BULLETIN 85-03.

Maximum Differential Pressure Valve Type and (osid)

Valve No. Function Manufacturer Qagn Close HCV-301 HPSI Injection 1500# Globe 2,500 psid (HSI-M-41) Header Velan Overseat HCV-302 Flow to Open or 2600 (HSI-M-42) Underseat HCV-311 HPSI to Reactor 1500# Globe 2,600 psid (HSI-M-11) Coolant Loop 1 Velan Underseat HCV-313 Flow to Open or 2400 psid (HSI-M-12) Overseat ,

HCV-321 HSPI to Reactor 1500# Globe 2,600 psid (HSI-M-21) Coolant Loop 2 Velan Underseat HCV-323 Flow to Open or 2400 psid (HSI-M-22) Overseat HCV-331 HSPI to Reactor 1500# Globe 2,600 psid (HSI-M-31) Coolant Loop 3 Velan Underseat HCV-333 Flow to Open or 2400 psid (HSI-M-32) , Overseat LCV 204V Charging Pump 150# gate 67 psid (CH-M-1) Suction from ' Velan LCV-204S Volume (CH-M-87) Control Tank i MOV 204U HPSI Suction 150# Gate 67 psid 215 psid (HSI-M-51) from RHST Velan MOV 204T (HSI-M-50)

MOV 3209 HSPI Suction 150# Gate 215 psid (HSI-M-55) from Residual Anchor MOV-3210 Heat Exchangers Darling (HSI-M-54) 7519L-SDE

, ,, MAINE YANKEE ATOMIC POWER COMPANY TABLE 1 (Continued)

Maximum Differential Pressure Valve Type and Cosid)

Valve No. Function Manufacturer OpfD Close MOV 3206 Spray Pump 150# Gate 20 psid (LSI-M-41) Suction from Anchor (HCV 318 K) RHST Darling MOV-3205 (LSI-M-40)

(HCV 317 K)

MOV 3207 Spray Pump 150# Trunnion 41 psid (CS-N-91) Suction from Posi-Seal (HCV 337 K) Containment MOV 3208 Sump (CS-M-92)

(HCV 338 K)

M0V 3202 Spray Pump 150# Gate 215 psid (SIA-M-53) Recirculation Anchor (HCV 305 K) to RHST Darling MOV 3204 (SIA-M-54)

(HCV 309 K) i 7519L-SDE i

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