ML20070J508

Forwards Response to RAI Re Implementation of EOC MCPR Recirculation Pump Trip (MCPR-RPT) Sys at Pbaps,Unit 2. MCPR-RPT Sys Subj of TS Change Request 93-02,forwarded by Util

ML20070J508
Person / Time
Site:	Peach Bottom
Issue date:	07/15/1994
From:	Hunger G PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9407250152
Download: ML20070J508 (5)

Text

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Station Support D4partmsnt

'. =I - 10CFR50.90 PECO ENERGY rgoTg;;;:n,,

965 Chesterbrook Boulevard Wayne, PA 19087 5691 July 15,1991 Docket No. 50-277 License No. DPR-44 U. S. Naclear Regulatory Commission Ai'.n: Document Control Desk Washington, DC 20555 S abject: Peach Bottom Atomic Power Station, Unit 2 Response to Request for AdditionalInformation Regarding Technical Specifications Change Request 93-02 (ASD RAI-2)

Dear Sir:

Attached is our response to your request for additional information regarding the implementation of the end of cycle Minimum Critical Power Ratio Recirculation Pump Trip (MCPR-RPT) System at Peach Bottom Atomic Power Station (PBAPS), Unit 2. The MCPR-RIT System was the subject of Technical Specifications Change Request No. 93-02, which was forwarded to you by letter dated April 6,1994.

If you have any questions, please contact us.

Very truly yours, A.aALyq,.

G. A. Ilunger, Jr., Director Licensing i cc: T. T Martin, Administrator, Region I, USNRC f W. L Schmidt, USNRC Senior Resident Inspector, PBAPS

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R. R. Janati, Commonwealth of Pennsylvania 9407250152 940715 7 DR ADOCK 0500 ,

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. . COMMONWEALTII OF PENNSYLVANIA  :

ss.

COUNTY OF CIIESTER  :

W. II. Smith, III, being first duly sworn, deposes and says:

4 That he is Vice President of PECO Energy Company; the Applicant herein; that he has read the enclosed response to the NRC request for additional information concerning Technical Specifications Change Request (Number 93-02) for Peach Bottom Facility Operating License DPR-44, and knows the contents thereof; and that the statements and matters set forth therein are true and correct to the best of his knowledge, information and belief.

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Vice President Subscribed and sworn to before me this / day of d 1994.

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Notary Public

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- Docket No. 50-277 License No. DPR-44 4

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RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION (ASD RAI-2)

PEACH BOTTOM ATOMIC POWER STATION, UNIT 2 Ouestion 1:

"Please verify adequacy of isolation devices (such as coil to contact isolation. . .) between safety related Reactor Protection System (RPS) and non safety-related EOC MCPR-RPT system."

Response

The isolation devices which provide coil to contact isolation between the safety-related Reactor Protection System (RPS) and the nonsafety-related end-of-cycle Minimum Critical Power Ratio Recirculation Pump Trip (MCPR-RPT) System are the RPS Generator load Reject (5A-K8A,B,C,D), Turbine Stop Valve Closure (5A-K10A,B,C,D),

and Turbine Trip Bypass (5A-K9A,B,C,D) relays. These relays are ecceptable isolation  !

devices between Class 1E and non-Class 1E systems provided the relays meet the following requirements:

a) the maximum voltage or current tramient on the non-Class 1E side will not degrade the operation of the C%s 1E side; and,

, b) shorts, grounds, or open circuits in the non-Class 1E side will not degrade the Class 1E circuit.

The RPS relays used as the isolation devices are GE model 12HFA151A9F relays, which are 0 listed, Class 1E devices. The relay contacts are rated for 12 amperes, continuously, and 30 amperes for 1 minute. Additionally, the MCPR-RPT System logic circuit power supply is 125 VDC, while the RPS relay contacts are rated for 460 VAC. The MCPR-RPT System logic has a 10 ampere fuse for circuit protection. Any current / voltage transient, ground, or short circuit in the MCPR-RPT System logic will cause the protective fuse to blow prior to exceeding the RPS relay contact rating.

Any open circuit in the MCPR-RIT System logic will have no impact on the RPS. ,

The IIFA relays in the RPS logic are also the isolation devices between the non-Class 1E 125 VDC annunoator circuit and the Class 1E RPS logic.

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• Docket No. 50-277

• License No. DPR-44 O'uestion 2:

"The submittal for the Technical Specification change request 93-02, page 7 last line of second paragraph states, '. . .to assure that the emitted and conducted EM fields from the ASDs will be acceptable, EM field measurements will be performed.'

a) From this statement we understand that the licensee intends to map a p_ew J EMI/RFI(EM) field for the plant which includes the combined effects of the existing EM field and the installation of the new ASD equipment. We would like to know when this mapping will be performed?

b) We understand that the new ASD equipment will be tested for EM emissions and for EM field susceptibility to verify that it will not operate inadvertently due to EM field.

We also understand that the existing safety-related systems will be tested to verify that the new EM fieid will not cause inadvertent operation.

In regards to these tests we would like to know; I. How and when such testing will be performed?

II. What standards (Industry and Military) will be used for such tests and for acceptance of test-results?

III. With the ASD-Cabinet door open, are ASD effects on existing equipment, during testing and during normal operation considered for the design modification?"

Bssponse:

a) Electromagnet Interference / Radio Frequency Interference (EMI/RFI) mapping of the ASD Room, and associated areas, will be conducted during pre-operational testing of the Adjustable Speed Drives (ASDs) following their installation. We anticipate that this testing will occur in mid-October, 1994, however, this date may change depending on outage progress.

b) The Acceptance Test Plan (ATP) for the ASD is still under development.

The ATP will be available for the Region 1 Inspector to review during subsequent inspections.

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Docket No. 50-277 License No. DPR-44 With regards to EMI/RFI items:

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I. EMI/RFI measurements of the ASDs will be conducted during a factory acceptance test in Baltimore, MD, currently scheduled to occur during the second week of August. The ASDs will be connected to a PBAPS recirculation pump motor, and will operate this motor unloaded.'Since the results of this test may not be typical of actual ASD operation at the plant, EMI/RFI mapping will also occur after ASD installation.

II. The EMI/RFI portion of the ATP is being developed using MII, STD-461 D (" Electromagnetic Emission and Susceptibility Requirements for the Control of Electromagnetic Interference",

dated January,1993) , MII STD-462 D (" Electromagnetic Interference Characteristics Measurement", dated January,1993) and International Electrotechnical Commission (IEC) Standard 801

(" Electromagnetic Compatibility for Industrial Process Measurement and Control Equipment").

III. The ATP for the ASD contains steps to measure for EMI/RFI fields with the ASD control cabinet and the RPT breaker compartment doors open. These values will be used for determining  ;

the acceptance criteria for EMI/RFI fields. The ASD Source Bridge (SCRs) and Load Bridge (GTOs) will not have their respective doors open during testing, since these cabinets will be locked closed during ASD operation for personnel safety reasons (high voltage).

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