ML20055F296

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Forwards Addl Info Re ATWS Mitigating Sys Actuation Circuitry
ML20055F296
Person / Time
Site: Trojan File:Portland General Electric icon.png
Issue date: 07/06/1990
From: Walt T
PORTLAND GENERAL ELECTRIC CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9007160222
Download: ML20055F296 (8)
v • d • e


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Portland General ElectricCompany xs l

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July 6, 1990

'i Trojan Nuclear. Plant Docket 50-344 License NPF-1

.l U.S. Nuclear Regulatory Commission J

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'Attnt Document Control Desk q

Washington DC 20555 j

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Dear Sirs

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. Additional Information Regarding Anticipated Transient Without Scram (A' DIS) Mitigating System Actuation Circuitry (AMSAC) f

.By letter dated.0ctober 31, 1989, Portland General Electric: Company (PGE) provided details of our proposed AMSAC. Additional information regarding 1

the isolation devices was to be provided after the equipment was purchased,.

'j and.AMSAC testing information was to be provided following completion of a

the detailed design. These items are addressed in the attachment to'this

.g letter.

1 Sincerely,

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T. D. Walt i

g Acting Vice President, Nuclear i

' Attachment c:L Mr. John B. Martin i

_ Regional Administrator, Region V U.S. Nuclear. Regulatory Commission y

h Mr. David Stewart-Smith I,'

State of Oregon Department of Energy 4

-Mr. R. C..Barr NRC Resident Inspector

[.: q Trojan Nuclear Plant ll l

b 9007160222 900706 O

PDR ADOCK 05000344 Af P

PDC (V

j 121 SW. Smrron heet Pomana Oregon 97204

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j Trojan ~NuclCOr Plant Document Ctntrcl Desk'

-l Docket.50-344 1'

License NPF-l' Attachment' i

Page 1 of 7-l

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l AMSAC OUTPUT ISOLATION RELAY

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POE's design fee implementation of AMSAC at' Trojan uses Potter and (7

Brumfield non-rotary relays Type KUEp-11A-15-120V.- These relays are a commercially available, general-purpose enclosed relay.

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These relays were tested and procured through an approved qualified l

vendor. In accordance with IEEE 344-1975 and-IEEE 323-1974.

4 These_ relays, together with a 1/8-amp Bussman Type KTK fuse, were-tested -

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-in simulated field conditions in a Hoffmann enclosure.

The test sample was subjected to the following tests:

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' 1.

Functional operability:

(relay, fuse, and fuse block).

2.

. Seismic:

tested in three states (energized, de-energized, and transition) for both the operating basis earthquake (OBE) and the safa shutdown-earthquake-(SSR).

3.

Extreme conditions:

(temperature to 131*F and humidity 95-100 percent RH)-with coil energized and both ac and de applied to the contacts..

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l' 4.

Isolation testing:

the test assembly was subjected to a maximum of 600 V ac applied to=the coil during which the contacts were shorted j

together and to ground, and the coil was shorted to ground.

5.

Post-testing operability.

i The seismic test results, up to the test facility's table limits, were L

' successful with no chatter (>2 ms)~with tho' relay. energized.- With the l

relay.de-energized, chatter-(-3-5 as) occurred above 75 percent of

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table limits.. For Trojan's installation. 75 percent of table limits is y

sufficient for the required response level.

Refer to attached Table 1

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for the test run sunmary.

For. isolation. testing _(high voltage and short circuit) the relay coil was fconnected in series with the fuse to limit fault current. The voltage H

' value of 600 V ac.was. based upon a postulated failure of:the supply O

transformer (3 phase 480/120) at the maximum. allowed voltage on the 480lV buses.

Figure 1 shows the test setup for this testing, and Table 2 represents the leakage currents-to-ground for these tests. The relay and

- fuse assembly were also connected to a nominal 480 V ac supply rated at 17.020 symmetrical fault current amps available and subjected to similar E

testing as the 600 V test configuration. The postulated maximum symmetrical fault amp available for this installation-is 2910, which is significantly less than the test supply of 17,020.

The results

' demonstrated that a fault (either high voltage or a short) on the input (coil side) will have no adverse effect on the output (contact side).

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Trojan Nuc1ctr Plant

Document Control Desk l

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.Dosk:t.50-344 L

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' License NPF Attachment.

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Page 2 of 7 E

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The relay test configuration was subject to a simulated elevated b

temperature and relative humidity for the postulated accident conditions-G of the' control room (alid environment) in which they will be installed.-

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During the test (four hours) the relay was energized at a nominal 120 V ac with one set of-contacts connected to 140 V ac and the other set

'I connected to 150 V de,.both at 1-amp load. No discernible ~offects'were.

recorded, i

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Bach relay, fuse, and fuseholder are instau ed in separate enclosures

- mounted to the control room wall. - The output cable to the 1E auto-st. art i circuit.of the auxiliary feedwater. pumps are installed inside rigid steel conduit containing only this cable, maintaining at least 1 inch separation between redundant trains.

The coil of these relays is energized by non-1E power through the ANSAC.

logic and output circuitry, with the lE side being the contacts; therefore, lE power is not required for isolation between IE and non-1E for the output relays.

The acceptance criteria-for this relay before, during, and aft'er the

.different tests were as follows:.

'1.

Insulation resistance for the relay 2,1 MQ measured at 500 V dc for one minute:

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Contact sets to ground.

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b. : Coll to ground.

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c. !Across open: contacts.

2.- Insulation resistance for the fuseblock >1-HQ measured at 500 V'de-a L?

for.one minute:

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Betwen o),en termi: mis.

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Between each tominal and ground.

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Demonstrated operability before, during, and af ter each test.

If NOTE:

Fuse may be blown during fault / isolation-testing.

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1; 4.

No failure is permitted during a seismic OBE level.such as cracked

[',f welds, sheared bolts, or other structural failure.

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Contact chatter 12 ms for the required response level.

6.

No fault (high voltage or short circult) on the coil side will have i

an adverse effect on the contact side.

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  • 4 TrojanNuclear_ Plant-Document C:ntrol'De2k j

g 7 Docket 50-344

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License EPF-1L Attachment 1

Page 3'of;7

l ev AMgAC TESTABILITY AT POWER The :.9 sic of _ the ANSAC system at Trojan is represented by.the mimic display of the test panel shown'in Figure 2.

The logic is derived by using two 1

Allen-Bradley programmable controllers operated in parallel to eliminate the L

o possibility of spurious' actuation, and requiring concurrence by both

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. programmable controllers to generate the actuation signal. The test panel has

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been provided to perinit testing'the system easily and contains all the f

-necessary switches, indicating lights, and signals to monitor test results and:

lJ to assist ^in troubleshooting, maintaining, and repairing the' system..

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b The non-safety-related AMSAC equipment was tested by Trojan temporary plant-

.i test procedures prior to restart from the 1990 refueling outage.

The AMSAC logic as shown in Figure 1-will be tested periodically thereafter. ~ The AMSAC systemiis required-to be tested every quarter from input signal' point (at the Class 1E signal isolators) to output actuation devices (not including the 4

devices represented by the last AND gates in Figure 1).. Also' required is a refueling interval test during plant refueling outages from input signal point 4

i

.through to tho' final' actuation devices.. A system response test'is also L

. performed on a refueling-interval.to verify that the.turbineitrips within-30 seconds:and the Auxiliary Feedwater System operates within 90 seconds, i

'The AMSAC actuation output signal is indicated on.an alarm wir.$ow inLthe h

. control room in a manner consistent with the new control' room annunciator

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design,' which includes the human factors design aspects of control room:

indication.-

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Docket 50-344 License NPF Attachment-Page 4 of 7 r

4 TABLE 1 Test Run Summary 4

Percent of Seismic Relay Operability Test No. 1-OBE/SSE No.

Table Limits Comments State Comments 1

OBE 1 50 Successful

. Energized No Chatter 2

.0BE 2 60 Successful De-..

No Chatter Energized 3

OBE 3 70 Successful Energized No Chatter 4

OBE 4 '

80 Successful De-See Note'1, c

Energized 5

OBE 5 90 Successful Energized No. Chatter 6

SSE 1 100 Successful.

See Note:

No Chatter-2 7

SSE 2

'100 Successful

-See Note See Note 3 3

8-SSE 3 90 Successfu11

.De-See Note:4-

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. Energized 9-SSE 4 80 Successful De-See Note 4:

Energized 10 SSE 5 75.

Successful De-See Note,5 Energized-

' Note 1: -Contact chatter, approximately 3-5 mS'in duration, occurred on alli contacts.

Note 2: The sample was transitioned from de-energized to energized,

-approximately 5 seconds into the event.

Note 3: The sample was transitioned from energized to de-energized, approximately 5 seconds into the event.

Contact chatter, approximately 3-5 mS in duration, was = observed while the sample was -

de-energized; To find the threshold level of the relay while de-energized, the test' levels were lowered and testing continued.

Note 4:

Contact chatter 3-5 mS in duration was observed, therefore test-levels were lowered and testing continued.

Note 5: No chatter was observed at this level.

In summary, proper contact 7

continuity was maintained through the full 100 percent levels while energized (Tests 6 and 7) and through the 75 percent level while de-energized (Test 10).

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Trojan Musictr Plant Dotument C ntrol Desk l

Docket 50-344 M'.

License WPF-1

-Attachment-'

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I&DLE.1 Leakage Current Test Data-c

. Leakage Current Applied-Voltage, (ua. AC)

(VAC)-

Test Eo. 1 3.62 600.04

. Test No. 2 5.71 600.40 1

Test No; 3:

3.03

'600.08 (Contact to Ground) 5.92 (Coll-to Ground).

PGN/bsh-4935W.0590

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Figure 2 Nota:

TS = " * - =

  • Test Switch cr Sypass Switen YJ- * " * =
  • Test Jack DS-**"**

ndicating Light L7/PY = -*

Class is Signal Isolater TDPU 25 Second Delay-On Timer

  • DDO 360 Second Delay-Off Timer

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