JPN-92-035, Responds to GL 89-10 Re Consideration of Results of NRC Sponsored Tests of motor-operated Valves.Mod Proposed to Remove Bypass Line & 12MOV-80

Responds to GL 89-10 Re Consideration of Results of NRC Sponsored Tests of motor-operated Valves.Mod Proposed to Remove Bypass Line & 12MOV-80

ML20101Q871
Person / Time
Site:	FitzPatrick
Issue date:	07/07/1992
From:	Ralph Beedle POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GL-89-10, JPN-92-035, JPN-92-35, NUDOCS 9207150141
Download: ML20101Q871 (6)

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July 7,1992 JPN 92-035 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Mall Station P1 137 Washington, D.C. 20555

SUBJECT:

James A. FitzPatrick Nuclear Power Plant Dcebot No. 50-333 Generic Letter 8}10, Supplement 3 Reforenco: NRC lotter B. C. McCabo to R. E. Boodle, dated March 11,1992, Response to Genotic Lottor 89-10, Supploment 3, " Consideration of the Results of NRC Sponsorod Tests of Motor-Operated Valves."

Dear Sir:

In the referenced letter, the NRC roquested that the Authority respond to thi00 evaluations concerning motor operated valves at the FitzPatrick plant. The NRC ovd.uations concluded that corta:n motor operated valvos could not perform their design basis function untoss certain operatior al conditions are mot. The Authority's evaluations concluded that the operational conditions epocified by the NRO are mot.

Tno Authority's responso is provided in Attachment 1.

If you have any questions, please contact J. A. Gray, Jr.

Very trt.ly yours, y

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Raiph E. Boodlo Exocutive Vice President Nuclear Generation cc: next page

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cc: Regional Administrator (J.S. Nuclocr Regulatory Commission r 475 Allendale Raad King of Prussia, PA 19406 Offico ofino Resident inspector  ;

U.S. Nuclear Regulatory Commission P.O. Boy.136 Lycomit.g, NY 13093  ;

Mr. Brian C. McCabe i

Project Directorate 11 Division of Reactor Projects 1/11 U.S. Nuctoai Regulatory Commission Mall Stop 14 82 Washington DC M555 .

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ATTACHMENT I TO JPN 92-035 GENERIC LETTER 89-10 SUPPLEMENT 3 pa001 of 4

1. Backgound in NYPA lotters dated December 13,1990 (Roforonce 1) and April 17,1991 (Reforonce 2) the Authority responded to Generic Lottor (GL) 8910 Suoplomont 3. ' Consideration of the Results of NRC Sponsorod Tests of Motor Operated Va'ves (MOV)." The Authority provided additionalinformation in a NYPA lotter dated August 1,1991 (Refcronco 3). The following responds to throo issues the NRC raised in Reference 4 concerning NYPA's August ist submittal.

Each NRC issuo is followed by the Authority's reply.

II. Response to individual Evaluation Determ_lnations NRC lssuc_1 o The NRC staff considers 23MOV 15 and 12MOV 15 to bo deficient and 13MOV 15 to bo marginal with respect to their capability to perform their design bases function to isolato containment in the eye . of a pipo broak downstream of tho valves, unless your staff can demonstrato that tho voltago at tho motor terminals will bo maintained abovo 90% of the motor rated va!uo such that the dograded voltago penalty nood not be applied. Your staff should verify that the actual minimum voltags will romain abovo 90% for thoso MOVs in accordance with the scheduto of Supplomont 3 to GL 89-10.

NYPA Rosponso 1 Calculatou min mum degradod motor terminal voltages for 23MOV 15,12MOV 15, and 13MOV 15 exceed 93% of the motor's rated voltage (575V). Thorofore, a degraded voltago penalty nood not be applied.

FitzPatrick's worst case degraded voltago condition occurs with a minimum voltage on the 115kV system of 115kV and fullload on the reservo station service and load contor transformors. Under thoso conditions the 600V omorgency buses supplying tho 23MOV 15, 12MOV 15, and 13MOV 15 valves have a degraded voltage of 535V (Reference 5).

Listed below aro calculated minimum motor terminal voltages assuming the 600V omorgency bus voltage is degraded to 535V (Rotorenco 6):

23MOV 15 527.3V or 91.70% of the motor's nomina! rating 12MOV 15 523.7V or 91.08% of the motor's nominal rating 13MOV 15 525.0V or 91.30% of the motor's nominal rating in all cases the motor terminal voltages excoed 90 porcent of 575V (575V X 0.9 = 517.5).

I ATTACHMENT l TO JPN 92-035

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GENERIC LETTER 8910 SUPPLEMENT 3 l pago 2 of 4 Application of Dograded Voltago Factors:

The Authority's Genoric Lettor 8910 Program conservatively calculatos revisod motor torques using a degraded vollege factor for a!! valves regardioss of the minimum motor terminal voltago. If tho results of the valvo's thrust and torque calculations show that the i motor operator is defielent, the Authority may remove this conservatism when degraded motor terminal voltago is greator than 90% of ratod voltage.

Other MOV Performanco Concerns:

The Authority also recognizes the NRC has additional concerns other than degradod voltage offecting MOV performance, including the selection of appropriate valvo disc factors.

Tho verification of these valves to perform their design basis function is continuing under the long term program to review MOV valve disc factors. This program, as described to the NRC in Reference 2, will assess Anchor / Darling's (A/D) blowdown test results to determino if the curront valvo disc factor of 0.2 is appropriato. Preliminary test results have boon recolved and indicate that the valve disc factors are higher than what was assumod. The Authority will assess the offect of these tost results on FitzPatrick valves prior to startup from the 1992 rofueling outage.

NRC lssuo 2 Your staff indicated that the 12MOV 80 is not required to perform a design bases function of isolating break flow, Your staff should verify this assortion or demonstrate the capability of the MOV.

NYPA Response 2 12MOV 80 was excluded from our Generic Lottor 8910 Program (Reference 2) because tho valve is normally closed and infrequently opened. Thorofore, it was not considered an isolation valvo for high onergy lino break mitigation. The valvo is an one Inch bypass around the Reactor Water Cleanup (RWCU) Suction Outboard Isolation Valvo (12MOV 18) and was designed to warmup the RWCU during system startups when the reactor is at operating pressure and temperature.

On October 19,1990, the valvo failed to stroke properly and was placed in the closed position with its power supply breaker tagged cpon. Procedure revisions were completed to startup RWCU without manipulating the 12MOV-80 valvo. As an alternative to repairing the valvo, a modification was proposed to remove the bypass line and the 12MOV-80. The modification will be completed this refueling outago (Reference 7), oliminating the need to reconsidor 12MOV 80 for the Generic Letter 89-10 Program.

ATTACHMENT I TO JPN 92 035 l

, GENERIC LETTER 8910 SUPPLEMENT 3 page 3 cf 4 i

NRC issuo 3 In the August 1,1991 submittal, your sta'f stated that all of the torque switchos are prosently set at the actuator manufacturer's design maximum sotting using run officiency. Your staff will be expected to demonstrate that a weak link analysis was porformod.

NYPA Responso 3 in Reference 3 (NRC Ouestion 2) the Authority stated that all actuators in the GL 8910 Supplomont 3 scopo are set at the maximum torque switch setting dotorminod by using the pull-out officioney in accordance with Umitorque Corporation tocommendations.

The Authority,in Reference 2, discussed reviewing the feasibility of using motor / actuator run officiency to datormino allowable torque switch settings in the open to-closo direction.

Analysos has been performed using run officiency, however, they have not boon used to chango MOV torquo switch sottings in the plar.t.

If torquo switch settings are changed based on run officioney, a weak link analysis of the valvo and oporator will be performed prior to the change.

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l ATTACHMENT I TO JPN 92-035 4

GENERIC LETTER 8910 SUPPLEki.MT 3 pago 4 of 4 Reforoncos

1. NYPA letter, J. C. Brons to NRC, 'Gonoric Lotter 89-10, Supplomont 3,* dated Docomber 13, 1999 (JPN 90474).

2. NYPA lettor, R. E. Boodlo to NRC, 'Gonoric Lottor 89-10, Supplomont 3, Itorp 2 HPCI, RCIC, and RWCU MOVs,' dated April 17,1991 (JPN 91013).

3. NYPA letter, R. E. Boodle to NRC, "Gonoric Lotter 8910, Supplomont 3, Roquest for AdditionalInformation," dated August 1,1991 (JPN 91039).

4. NRC lot 1er, B. C. McCabo to R. E. Boodle, "Responso to Gonoric Lottor 8910, Supplomont 3, " Consideration of the Results of NRC Sponsored Tosts of Motor Operated Valves," dated March 11,1992 (JAF 92 070).

5. James A. FitzPatrick Nuclear Power Plant Final Safety Analysis Report, Section 8,6,6.c, "Emergoney Bus Voltages When Operating From the Reserve Sourco', Revision 3, dated January 1992.

6. NYPA Momo JMD-92192, 'Dograded Voltago Analysis for 23MOV 15,13MOV 15, and 12MOV 15," dated April 22,1992.

7. NYPA Modification M190-006 Rev.1, *Romovo 12MOV 80 Valvo."

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