ML20202C233

Forwards Motor-Operated Valve Common Mode Failures During Plant Transients Due to Improper Switch Settings, in Response to 851115 IE Bulletin 85-003

ML20202C233
Person / Time
Site:	Beaver Valley
Issue date:	05/16/1986
From:	Carey J DUQUESNE LIGHT CO.
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
IEB-85-003, IEB-85-3, NUDOCS 8607110159
Download: ML20202C233 (7)

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'1"r3C Telephone (412) 393-6000 Nuclear Group P O. Box 4 Shippingport, PA 15077-0004

. S. Nuclear Regulatory Commission ttn: Dr. Thomas E. Murley, Regional Administrator Region 1 631 Park Avenue King of Prussia, PA 19406

Reference:

Beaver Valley Power Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 IE Bulletin No. 85-03; Motor Operated Valve Common Mode Failures During Plant Transients Due to Improper Switch Settings Gentlemen:

In response to IE Bulletin 85-03, dated November 15, 1985, the attached report is submitted regarding motor-operated valve switch settings.

If you have any questions regrding this submittal, please contact myself or members of my staff.

Very truly yours, J. J. Carey Vice President, Nuclear l Attachment cc: Mr. W. M. Troskoski, Resident Inspector U. S. Nuclear Regulatory Commission Beaver Valley Power Station

! Shippingport, PA 15077 l

U. S. Nuclear Regulatory Commission c/o Document Management Branch Washington, DC 20555 i U. S. Nuclear Regulatory Commission

! Document Control Desk Washington, DC 20555 B607110159 860016

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COMMONWEALTH OF PENNSYLVANIA)

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COUNTY OF BEAVER ')

On this _ /$"M day of &- , /fr?o , before me, //IrlA/# WA/hm, a Notary Publfc in and for said Commonwealth and County, personally appeared J. J. Carey, who being duly sworn, deposed, and said that (1) he is Vice President of Duquesne Light, (2) he is duly authorized to execute and file the foregoing Submittal on behalf of said Company, and (3) the statements set forth in the Submittal are true and correct to the best of his knowledge, information and belief.

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SHEllA M. FATT02E.10TARY PUBUC SHIPPillGPORT BORD, BEAVER COUNTY

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ATTACHMENT BVPS-1 Report to IE Bulletin No. 85-03 Motor-Operated Valve Common Mode Failures During Plant Transients Due to Improper Switch Settings Each of the actions a through d stated in IEB No. 85-03 are addressed below. Report arrangement correlates to that of the actions in the Bulletin. This report is provided to satisfy the submitting requirements of Action e of the Bulletin.

a) Table 1 reports the results of the BVPS-1 review for motor-operated valves in the high pressure coolant injection system and the auxiliary (emergency) feedwater system. At BVPS-1 parts of the Chemical and Volume Control System, primarily the charging pumps, are also used for the high pressure coolant safety injection. Correspondingly, Table 1 includes the valves which function to isolate the Reactor Coolant System normal charging flow path and the valves required to align the charging pumps for high pressure safety injection.

A comparison of design differential pressures with accident system condition differential pressures in Table 1 (Columns D and H, respectively) confirms the adequacy of the original design specifications' criteria used to size the motor operators for these valves. The design differential pressures were determined from the applicable vendor's design specifications. The accident condition differential pressures were conservatively determined by assuming a single pipe failure downstream of the valve and applicable pump discharge or tank pressure at the inlet to the valve.

b) The design thrust requirements and the corresponding torque switch settings will be established for the design differential pressures identified in Table 1. These parameters will be calculated independently and verified against the valve operator manufacturer's original calculated data. The valve operator gear ratios will also be determined for compliance with stroke speed refer to Item C below for the method of I requirements, please

verifying the other switch setpoints.

c) The adequt.qy of existing valve operator torque levels, position limit switch set points, and protective overload capability will be verified by in plant testing using the motor operated valve analysis and test system (MOVATS). Duquesne Light Company has recently purchased this system and both operations and engineering personnel are trained to use this diagnostic equipment. The valves listed in Table 1 will be evaluated with this instrument and the switch settings will be changed if indicated by these evaluations. Normal post adjustment system testing and differential pressure testing will be performed to the extent required and permitted by system operation limitations. However, differential pressure testing should be minimal, since the valves were previously tested to demonstrate stroke time compliance at design differential pressure prior to shipment from the valve manufacturer.

. Attcchment Page 2 d) The established open/close torque switch, maximum torque switch, torque bypass position limit, open position limit, and any specified stroke time requirements will be included in the BVPS-1 corrective maintenance procedure. These performance parameters will be required to be recorded in the "as found" and "as left" condition to assure compliance with the established performance parameters for the valves in Table 1.

e) The completion schedule is provided below. The completion date for the confirmation of switch settings occurs within the anticipated time of the sixth refueling outage for BVPS-1, which is currently scheduled to begin in November of 1987, to allow for operator switch testing as needed.

ACTION COMPLETION DATE

- Establish switch settings 12-1-86 Prepare / modify electrical main- 6-30-87 tenance procedure

- Confirm switch settings 12-31-87 Submit final report 2-29-88

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TAsLa 1 ,

(E) (F) (G) (H)

(A) (B) (C) (D)

Operates on Emergency Accident Valve Design Spec. Normal Safety System Function Valve System (Basis)A P System Open/Close Operation Signal Operation (AP) Psi Valve Operator Function System location Manufacturer, no. Component Model, ID, Manufacturer, Motor RPM, Type, Size, ANSI Rating Yes Open 40 (1)

1) CH-1158, D Limitorque RWST to 200/200 closed 12-GM42FB SMB-00-10 Charging A. Darling Gate 3600 RPM Pump Suction 8*, 150 psi Open No (operation closed 2,550 (1)

2) CH-275 A, B, C Limitorque Charging 2750/2750 2-TM58 FN SMB-00-25 Pump from Benchboard)

Velan 1800 RPM Mini-flow Clobe Isolation 2", 1500 psi VCT 200/200 Open No. (close on Closed 40 (1) (

3) CH-115C, E Limitorque 4-GM42F8 SMB-00-5 Outlet signal when Anchor-Darling 3600 RPM CH-115 B&D are Gate CPen) 4*, 150 psi Limitorque Emergency 200/200 Closed No - (Operation Open 40 (1)

4) CH-350 2-GM42FB SMB-000-5 B9tation from Benchboard)

Aloyco 1800 RPM Isolation Gate 2", 150 poi

5) CH-289 Limitorque Charging 2750/2750 Open Yes closed 2750 (1) 3-GM58FN SMB-00-15 Containment Velan 1800 RPM Isolation Gate 3*, 1500 psi 1

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.LE 1 (A) (B) (C) (D) (E) (F) (G) (H) valve Design Spec. Normal Operates on Emergency Accident Valve System (Basis) A P System Safety System Function volve operator Function Open/Close operation Signal Operation (AP) Psi G) C2-310 Limitorque RCS 2750/2750 Open Yes closed 2750 (1) 3-GM58FN SMB-00-15 Charging Vel:n Gate 1800 RPM Isolation 3*, 1500 psi

7) C?-373 Limitorque Charging 2750/2750- Open No (Operation Closed 2750 (1) 3-GM58FN SMB-00-15 Pump Mini- from Benchboard)

VJlcn Gate 1800 RPM Plow Isolation 3", 1500 psi G)51-836 Limitorque High Head 2750/2750 closed (may be No (Operation OPen 2550 (1) 3-GM58FN SMB-OO-15 SI to RCS open under from Benchboard)

'V31cn Gate 1800 RPM Cold Leg administrative 3", 1500 psi Isolation control)

9) SI-867A, B Limitorque Boron 2750/2750 Closed Yes Open 2550 (1) 3-GM-58FN SMB-00-15 Inj. Tank We:tinghouse 3600 RPM Inlet Gato Isolation 3*, 1500 psi

10) SI-867C, D Limitorque Boron 2750/2750 Closed (may be Yes Open 2550 (1) 3-GM-58FN SMB-00-15 Inj. Tank open under valen Gate 1800 RPM Outlet- administrative 3", 1500 psi Isolation control) 111 SI-869A, B Limitorque High Hd. 2750/2750 Closed (may be No (Operation Open 2550 (1) 3-GM50FN SB-00-15 SI to RCS open under Valr.n Gate from Benchboard) 1800 RPM Hot Legs administrative 3", 1500 psi control)

12) Fw-151A, B, C Limitorque SG Aux 1445/1445 Open Yes (Receive auto Open 1167 (2)

D, E, F Globe SMB-00-10 FD Control open signal even 3", 600 psi 1800 RPM from A, "B" though normally or "C" HDR open )

NOTES -

TABLE 1 (1) Charging pumps discharge or suction pressures were obtained from the Technical Manual which is considered a conservative determination for valve open/close differential pressure since it does not take into account line losses.

(2) Aux, feedwater pump discharge pressure as calculated from TDH value assuming worst condition (one aux. feedwater line break and low NPSH).

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