ML20211Q108

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Informs That Contact Pressure Will Be Removed from Reactor Trip Breaker Trending Program.Westinghouse Indicated That Test for Contact Pressure Should Be Go no-go Test Instead of Obtaining Actual Reading.List of Trended Parameters Encl
ML20211Q108
Person / Time
Site: Beaver Valley
Issue date: 12/10/1986
From: Sieber J
DUQUESNE LIGHT CO.
To: Tam P
Office of Nuclear Reactor Regulation
References
GL-83-28, TAC-53114, NUDOCS 8612190201
Download: ML20211Q108 (3)


Text

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'Af M Telepnone (412) ass-coco Io.'*e*E[l "" December 10, 1986 Shippingport, PA 15077-0004 Director of Nuclear Reactor Regulation

,U. S. Nuclear Regulatory Commission

/ Attn: Mr. Peter S. Tam, Project Manager Project Directorate No. 2 Division of PWR Licensing - A Washington, DC 20555

- Mail Stop 340 -

Reference:

Beaver Valley Power Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 Generic Letter 83-28, Item 4.2.2 Gentlemen:

( By letter dated April 24, 1985, the NRC provided a Preliminary Safety Evaluation (SE) on our program for trending of Reactor Trip Breaker parameters based on our response to Generic Letter 83-28 item 4.2.2 in letters dated November 4, 1983 and October 30, 1984. The SE concluded that our program goes well beyond the minimum requirements of the staff position and is acceptable.

This letter is to inform you that we are removing Contact Pressure from the Reactor Trip Breaker trending program. The bases l for removal is that during the performance of our preventive maintenance program, Westinghouse indicated that the test for contact pressure should be a Go No-Go test instead of obtaining the actual reading. As a result, no data is available for trending.

Additionally, by performing a Go No-Go test, we are reducing the safety hazard associated with obtaining the contact pressure measurement since it requires less time to complete while reaching into a closed breaker.

Section 2.2 of the SE identifies the minimum acceptable parameters for the trending program and indicates that removal of any of the minimum parameters requires NRC approval. Contact pressure was not one of the parameters identified in Section 2.2 of the SE, thus our program still meets the staff position for an acceptable trending program. Attachment 1 is a list of Beaver Valley 1 trended parameters.

If there are any questions, please contact my office.

Very truly yours, 061.,h$3A b

J. D. Sieber bo h

Obl21)h201 oCW OSOO PDR Vice President hDR Nuclear Operations Ill

Benvar Vclley Power Stetion, Unit No. 1

- Dockst No. 50-334, Lictn2s No. DPR-66 Gen 3ric Lstter 83-28, Ittm 4.2.2 Page 2 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 Document Management Branch Washington, DC 20555 Director, Safety Evaluation & Control Virginia Electric & Power Company P.O. Box 26666 One James River Plaza Richmond, VA 23261 4

4 ATTACHMENT 1 Beaver Valley Unit 1 Reactor Trip Breaker Trending Parameters Response time for reactor trips from plant computer Re.sponse time for undervoltage trip attachment from breaker time response time test.

Response time for shunt trip attachment from breaker time respone time.

Undervoltage trip attachment dropout voltage from preventive maintenance.

Trip force from preventive maintenance Insulation resistance from preventive maintenance Contact resistance from preventive maintenance Trended Data Evaluation Criteria Parameter Criteria Time Respone 1 0.167 seconds UVTA Dropout Voltage 14.4 to 28.8 volts Trip Force 1 31 ounces Insulation Resistance > 2.0 megohms Contact Resistance 1 50 micro-ohms j

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