ML20117L918

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Forwards Revised Response to Generic Ltr 83-28,Item 4.3 Re Bypass Breaker Status Indication.Rev to Design Concept for Shunt Trip Attachment Automatic Actuation Includes Status Indication for Reactor Trip Bypass Breaker
ML20117L918
Person / Time
Site: Beaver Valley
Issue date: 05/10/1985
From: Carey J
DUQUESNE LIGHT CO.
To: Varga S
Office of Nuclear Reactor Regulation
References
GL-83-28, TAC-53166, NUDOCS 8505160438
Download: ML20117L918 (10)


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Telephone (412) 3934000 gugleer g a,roup May 10, 1985 Shippingport, PA 15077-0004 U.S. Nuclear Regulatory

      , Division of Licensing Attn: Steven A. Varga, Chief Operating Reactors Branch #1 Division of Licensing Washington, DC             20555

Reference:

Beaver Valley Power Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 Bypass Breaker Status Indication, Generic Letter 83-28, Item 4.3 Gentlemen: By letter dated January 14, 1985, we provided a response to the confinnatory items identified in the Safety Evaluation (SE) for Generic Letter 83-28, Item 4.3. By letter dated March 20, 1985, you provided the NRC's position for requiring status indication for reactor trip bypass breakers. Based on our review of the NRC's position, specifically the need to insure P-4 initiation, we have initiated a revision to our design concept of the automatic actuation for the reactor trip breaker shunt trip attachment to include status indication of the reactor trip by-pass breakers. Therefore, we are providing a revised response to the confirmatory items identified in the SE dated November 8,1984. If you have any questions, please contact my office. J. J. Carey Vice President, Nuclear Attachments k P 4 hO

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IL_ W '. May-10, 1985 (f Beaver Valley Power Station, Unit No. 1 J- Docket No. 50-334, License No. DPR-66 Bypass Breaker Status Indication,

         . Generic Letter 83-28,- Item 4.3 Page            cc: Mr. W. M. Troskoski, Resident Inspector U.S.- Nuclear Regulatory Commission Beaver Valley Power Station Shippingport, PA      15077 U.S. Nuclear Regulatory Commission c/o P7cument Management Branch Washington, DC      20555 Director, Safety Evaluation and Control Virginia Electric & Power Company P.O. Box 26666 One James River Plaza Richmond,_VA     23261 l'

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Revised May 1985 Beaver Valley 1 Response to NRC Safety Evaluation Report on Generic Letter 83-28, Item 4.3,

                            . Automatic Shunt Trip Modification NRC Condition (a) Submission     of ievised information including revised electrical schematics showing provisions of bypass breaker position status lights on the main control board as noted in Item 1.

Response (revised) Attached is a preliminary electrical elementary diagram for the proposed - automatic shunt trip modification. This diagram identifies the bypass breaker UVTA circuit, STA circuit, breaker controls and breaker status / alarms. As part of the modification, breaker position indicating lights are to be added for the bypass breakers. The lights are to be powered from the same 125VDC supply as the shunt trip and closing circuit. The green light is to be in series with a "b" auxiliary contact, which will indicate breaker open

     .and power available for closing. The red light is to be in series with the shunt trip coil and an "a" auxiliary contact, which will indicate breaker closed, power available for tripping and shunt trip coil continuity.

Tentatively, the status lights are proposed to be installed on Section B of the Main Control Board near the reactor trip breaker control switch, 1-RTC. However, with the limited open area around the switch, the exact location cannot be determined until the detailed design is complete. NRC Condition (b) Confirmation that shunt trip components have been seismically qualified as noted in Item 6. Response (revised) The WOG quali fict, tion reports were received and are being reviewed for applicability to BVPS-1 design. NRC Condition (c) Confirmation that testing of bypass breaker undervoltage trip attachments will be performed as noted in Item 10. Response (notrevised) Note, Item 10 of the safety evaluation report requires testing of the shunt trip attachment; therefore, this item should reference shunt trip attachment instead of the undervoltage trip attachment.

[ p ,. L .? Revised May'1985 l .: L . L MSPs 1.04 and .1.05, Reactor Protection Logic System Train ' A' ('B') Bi-Monthly Test," have been revised to test the shunt trip attachment of the bypass breaker, with the. breaker in the test position, via the local trip pushbutton prior to closing for reactor trip breaker testing. This verifies that the shunt trip attachment will open the bypass breaker. NRC Condition L(d) Confirmation that bypass breaker testing will demonstrate proper operation of control board bypass breaker position indication as identified in Item 11. Response (revised) The bi-monthly tests of the reactor protection system (MSPs 1.04 and 1.05) verify proper. operation of annunciators A4-101 and A4-109, P-250 points Y0026D and Y0027D, and sequence-of-events points 192 and 201. In addition, the bi-monthly tests (MSPs 1.04 and 1.05) and the startup manual reactor trip test (OST 1.1.7) will be revised to verify proper operation of the bypass breaker position indicating lights.

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r NRC Condition (e) Submission of proposed Technical Specifications noted in Items 10 and 13, following implementation of this modification. Response (not revised) Attached are proposed Technical Specification changes for Beaver Valley 1. These will be verified and formally submitted for approval following installation.of the shunt trip modification and on-site review. Functional Unit 24 and Note 10 are proposed for incorporation of the bypass breaker testing requirements as indicated in Item 10 of the November 8, 1984 Safety Evaluation Report. Independent verification of the undervoltage and shunt trip attachments required by Item 11 of the November 8, 1984, Safety Evaluation Report is proposed for Functional Unit 21 during the Channel Functional Test by Note 11 on a bi-monthly frequency.

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