ML20237D204
| ML20237D204 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 12/02/1987 |
| From: | Sieber J DUQUESNE LIGHT CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| TAC-62943, NUDOCS 8712230108 | |
| Download: ML20237D204 (13) | |
Text
{{#Wiki_filter:_ _ _ _ _ _ _ _ _ - _ _ _ _ _ _ - _ _ _ _ 3dkk. . 15$r0C Telephone (412) 393-6000
- 3--
Shippingport. PA15077-0004 December 2, 1987 I i )
'/U . S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555
Reference:
Beaver Valley Power Station, Unit No. 1 and No. 2 BV-1 Docket No. 50-334, License No. DPR-66 BV-2 Docket No. 50-412, License No. NPF-73 10 CFR 50.62, ATWS Rule Implementation Gentlemen: On November 19, 1987 a conference call was held between members of your staff and Duquesne Light Company to discuss the ATWS Mitigation System Actuation Circuitry (AMSAC) to be installed in Beaver Valley Units 1 and 2. This letter provides additional information that was requested at that time to assist in your review of our AMSAC design. AMSAC Annunciators and Bypasses Attached are functional diagrams of the AMSAC circuitry for both Unit 1 and Unit 2. As noted in these drawings there are four annunciators associated with AMSAC for each unit. All annunciators are located in the main control room. An AMSAC Trouble Alarm is annunciated if any of the three feedwater flow signals or Turbine 1st Stage pressure signals fails low, or, if a loss of primary or backup power to AMSAC is sensed. Separate control room annunciators also exist for AMSAC timer initiation and for AMSAC actuation initiation. Should the AMSAC output actuation be placed in bypass, an AMSAC bypassed annunciator provides continuous bypass status indication in the control room. The means for bypassing AMSAC is a permanently installed bypass switch on the AMSAC test panel (Switch BS/MS440-Unit 1, BS/2 MSS 440-Unit 2 on attached diagrams). Disconnect switches associated with each output relay also allow individual output relay actuations to be bypassed for testing. Operating any of these switches also initiates the AMSAC Bypassed annunciator in the control room. When testing is completed, procedural controls will ensure that AMSAC is returned to operational status. AMSAC control room annunciators would alert the operator of any abnormal condition. We have therefore not incorporated the mechanical interlock that would have prevented closing the AMSAC cabinet doors with the bypass switches in the bypass mode as previously discussed in our February 27, 1987 submittal. 8712230100 871202 PDR ADDCK 05000334 PDR D f{ P
beavar Valley Power Station, Unit No. 1 and No. 2 BV-1 Docket No. 50-334, License No. DPR-66
,BV-2 Docket No._50-412, License No. NPF-73 10 CFR 50.62, ATWS Rule Implementation l Page 2 j l
Failed Feedwater Flow Channel Block j l The AMSAC logic monitors the feedwater flow signals entering the q cabinet for levels indicative of an instrument loop failure. AMSAC In our previous submittal in February, we had stated that if all i three feedwater flow channels fail, that the AMSAC actuation will be 1 blocked. However, we have since modified our design. As presently ' designed, if any of the three flow channels fail, the AMSAC outputs are automatically blocked and an AMSAC Trouble annunciator is alarmed ; in the control room as discussed above. Should a feedwater flow channel fail and defeat the AMSAC output, we will require the failed AMSAC flow channel to be placed in a tripped condition within 48 hours which will remove the auto block feature. AMSAC Testing As described in our past submittal, our AMSAC design is testable at power. Testing at power is accomplished through an integrated test panel which includes a bypass switch that blocks the actuation signal and provides continuous annunciation in the control room as discussed above. Testing is performed by first placing the bypass switch in the bypass mode. Test switches for each of the inputs are switched individually and in combination to allow insertion of analog test signals. Actuation of bistables and logic is observed on test panel lights. Our pcriodic testing frequency will be based on manufacturer and engineering recommendations. An 18-month testing frequency is currently planned. The periodic testing will include a functional test of the logic, time delays and setpoints and a end-to-end test from the instrument channel inputs to AMSAC through i to the final actuation devices. Actual operation of the final i actuation devices will not be included in this test since this equipment is tested in other procedures. The end-to-end test will be perfm led during plant shutdowns. AMSAt. Isolation Device - Appendix A Information The following information is provided in response to the additional plant specific information requested for AMSAC isolators:
- a. For the type of device used to accomplish electrical isolation, describe the specific testing performed to demonstrate that the device is acceptable for its application (s). This description should include elementary I
diagrams when necessary to indicate the test configuration and how the maximum credible faults were applied to the devices.
Response
Refer to the attachea Figure 1. This figure was extracted from our Isolation Test Plan used to qualify the Magnecraft relay models no W199ABX-14 used as AMSAC output isolators. The relays were subjected to a postulated fault situation to determine the devices ability to block fault voltages and/or currents from crossing input to output boundaries. Three tests were performed. In Test 1, a test voltage of 600 VAC at
Banver Valley Power Station,' Unit No. 1 and No. 2 NV-1DocketNo. 50-334, License No..DPR-66
,BV-2 Docket No.~50-412, License No. NPF-73 10 CFR 50.62, ATWS Rule Implementation Page 3 60 hertz -tested the capability of the device to isolate an AC fault cn1 the input- terminals from the output terminals. In Test 2 a test voltage of 600 VAC was applied to the output terminals to assess the affects of output faults on the input terminals. In Test 3 a test voltage of'150 VDC was applied to the output terminals to assess the effects of a DC fault on the input circuit.
- b. Data to verify that the maximum credible faults applied during the test were the maximum voltage / current to which the device could- be exposed, and define how the maximum voltage / current.
-was determined.
Response
The maximum credible fault voltage for this relay application is 127 VAC on the input and 150 VDC on the output. 127 VAC is the maximum potential available on the 120 VAC system based on 110% of 115 VAC as controlled by our System Station Service Transformer's line tap changers. 150 VDC is the maximum potential available from the annunciator system field contact power supplies. A 600 VAC test value was used during these' ' tests to also qualify this relay in other applications where a qualified isolator is required.
- c. Data to verify that the maximum credible fault was applied to the output of the device in the transverse mode (between signal and return') and other faults were considered (i.e.,
open and short circuits).
Response
Refer to Figure 1 for location of where the faults were applied.
- d. Define the pass / fail acceptance criteria for each type of device.
Response
Following each of the three tests, the fault voltages were applied between the terminals and the mounting plate to verify no current flow and high potential tests were done between the inputs and mounting plate, inputs and outputs and the outputs and mounting plate to verify no insulation breakdown.
- e. Provide the commitment that the isolation devices comply with the environment qualifications (10 CFR 50.49) and with the seismic qualifications which were the basis for the plant licensing. ,
Response
The isolation devices comply with the environmental and seismic qualifications which are the licensing basis for the Beaver Valley Units.
Beaver Valley Power Station, Unit No. 1 and No. 2 EV-1 Docket No. 50-334, License No. DPR-66
-BV-2 Docket No. 50-412, License No. NPF-73 10 CFR 50.62, ATWS Rule Implementation Page 4
- f. Provide a description of the measures taken to protect the safety systems from electrical interference (i.e.,
Electrostatic Coupling, EMI, Common Mode and Crosstalk) that may be generated by the ATWS circuits.
Response
The final actuation control device is relay logic and the AMSAC system logic is isolated from the control logic by qualified isolators and metal barriers,
- g. Provide information to verify that the Class lE isolator is powered from a Class lE Source.
Response
The final actuation device is on the output side of the isolator and is powered from a Class 1E source. The AMSAC control circuitry is on the input side of the qualified isolators which are powered from a non-lE source which is battery backed. If you have any additional questions on our AMSAC design, please contact my office. Very truly yours,
. D. Sieber ice President, Nuclear 1
i cc: Mr. J. Beall, NRC Resident Inspector l Mr. W. T. Russell, NRC Region I Administrator Mr. P. Tam, Project Manager Director, Safety Evaluation & Control (VEPCO) , l 1 l l 1 l l i 1
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- ,e ATTACHMENT 2 FIGURE 1 DCP 693 Isolator Test NOTE: Mount relay on metal mounting plate.
Destructive Fanit Tests - Magnecraft Relay W199ABX-14 (conduct at room temp.) Metal Mounting Plate Input Test - With output loaded 3 as shown apply 600 VAC; 60HZ Contact I having 2000 amp short circuit 'N I j O'I capability at input. % 150 VDC N ' ~ (No special gCoil 2 1 gg j , M i short ekt. J capacity)
- t-O I-I 5 amps 04-h IN OUT
- 1. Apply 600 volts until coil stabilizes (or opens).
- 2. Open switch.
- 3. Apply 600 VAC, one lead on metal mounting plate, the other to each input terminal - No current flow expected.
AC Output Test - With input Metal Mounting Plate energized as shown l Contact A PPl y 600 VAC y f 60HZ having 2000 g I amps short (No special 132 VAC N Coi1 *; -- circuit 60 HZ I e I short ekt. gg capacity) l Wl DW g , output i - - - - __ _Is IN OUT
- 1. I = 2000 amps (switch will blow)
- 2. Apply 600 VAC, ene lead on metal mounting plate, the other to each octput terminal
- No current flow expected.
DC Output Test - With input energized as shown t-
- - - Contact----y Apply 150 VDC g 1 ,i having 500 amp (No special 132 VAC Q { g short circuit short ekt. 60 HZ apability at capacity) ICoil ~~ 1 --
output. l g
-(3 i d-sw i _ _ _ _ _ _ _ _. a
- 1. Apply to output as shown -
l switch will blow.
- 2. Apply 150 VDC, one. lead on metal mounting plate, the other to each output terminal -
No current flow expected. _ __ __d}}