ML17308A240

Forwards Info on Diverse Scram Sys Conceptual Design & plant-specific Auxiliary Feedwater Actuating Sys/Reactor Protective Sys Diversity Study,Per 861103 Commitment

ML17308A240
Person / Time
Site:	Saint Lucie
Issue date:	07/15/1987
From:	Woody C FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
L-87-301, NUDOCS 8707210600
Download: ML17308A240 (20)

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REQULAT INFORMATION DISTRIBUTION STEM (BIDS)

ACCESSION NHR: 8707210600 DOC. DATE: 87/07/15 NOTARIZED: NO DOCKET FACIL: 50-335 St. Lucie Planti Unit ii Florida Power 5 Light Co. 05000335 50-389 St. Lucie Planti Unit 2i Florida Power 5 Light Co. 05000389 AUTH. NAME AUTHOR AFFILIATION WOODY'. O. Florida Power 5 Light Co.

REC IP. NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

BUHJECT: Forwards info on diverse scram sos conceptual design 5 plant-specific auxiliary feedwater actuating sos/reactor protective sgs diversity study'er 861103 commitment.

aa.c DISTRIBUTION CODE: A055D COPIES RECEIVED: LTR J ENCL Q SIZE:

TITLE: OR/Licensing Submittal: Salem ATWS Events GL-83-28 NOTES:

REC IP IENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD2-2 LA 1 0 PD2-2 PD 3 3 TOURIGNYe E 1 INTERNAL: ARM/DAF/LFMH 1 0 NRR LASHER' 1 NRR/DEBT/ICSH 1 1 NRR/DEBT/PBH 1 0 NRR/DEST/RSH 1 1 NRR/DLPG/GAH 1 0 NRR/DOEA/QCH 1 0 NRR/PMAS/ ILRH 1 0 S/PMSH 1 0 OGC/HDS2 1 0 REG IL 01 1 1 RES/DE/EI H 1 1 EXTERNAL: LPDR NRC PDR 1 1 NSIC TOTAL NUMHER OF COPIES REQUIRED: LTTR 20 ENCL 12

P. X 14000, JUNO BEACH, FL 33408 iiIII I jj'r~~~4 FLORIDA POWER 8 LIGHT COMPANY QU'Q i 5 198~

L-87-30 I 10CFR50.62 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555 Gentlemen:

Re: St. Lucie Units I and 2 Docket Nos. 50-335 and 50-389 Anticipated Transients Without Scram (ATWS) Plant S ecific Information In accordance with Florida Power & Light Company (FPL) letter L-86-446, dated November 3, l986, the plant specific Diverse Scram System Conceptual Design and the plant specific AFAS/RPS Diversity Study are enclosed.

Should any additional information be required, please contact us.

Yery truly yours, C.~ O.~ Wo Group Y President Nuclear Energy Department COW/GRM/gp Enclosures (2) cc: Dr..J. Nelson Grace, Regional Administrator, Region II, USNRC Senior Resident Inspector, USNRC, St. Lucie Plant r e7ovaioboo ggOCK ooss5 Pgg O500pg~

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ST. LUCIE UNIT 2 RPS BISTABLE SCHEMATIC NO. 34868 CARD PART NO. 34610 ST. LUCIE UNITS 1 AND 2 AFAS BISTABLE SCHEMATIC NO. 33441 CARD PART NO. 33440 FIGURE 5.5

ST. LUCIE UNITS I AND 2 AFAS BISTABLE AND MATRIX RELAY CARD FIGURE 5.6

ST. LUCIE UNIT 1 RPS MATRIX RELAY ORIGINAL CLARE RELAY SHOWN WITH THE REPLACEMENT DOUGLAS RANDAL ASSEMBLY ST. LUCIE UNIT 2 RPS MATRIX RELAY CARD PART NO. 34610 FIGURE 5.7

6. 0 SYSTEM RELIABILITYAND RESISTANCE TO COMMON MODE FAILURES Diversity by itself is not sufficient to satisfy the intent of the ATWS Rule. Several proposals to solve ATWS preceeded the requirements of 10CFR50. 62.

The Hendric Rule 46FR57521 proposed to resolve ATWS by establishing a reliability assurance program for systems that prevent or mitigate ATWS accidents.

The Hendric Rule recognized that reliability/availability is the key to reducing ATWS risk. In addition to the Final Rule requirements Commissioner Roberts suggested a reliability assurance program to improve plant safety.

Clearly, reliability and safety are most important. The final ATWS rule with its diversity requirements is intended to improve these two qualities by diversity and resistance to common mode failures.

The initial reliability of a system depends upon piece parts selection criteria, circuit design margins (derating), packaging, parts screening test, assembly burn-in, and many other mechanical, electrical, electronic, and environmental considerations.

After installation and startup, failure rates may be relatively high as weak parts, that escaped the test screens, are weeded out of the system.

Accumulation of system operation time acts to eliminate latent defects.

As operating time increases, the resistance to all failure modes, including common mode failures, increases.

After a few years of operation and correction of defects and deficiencies, the system approaches a minimum failure rate and maximum sustained reliability. In a well designed all solid state system, this reliability is sustained indefinitely since there is no wear out characteristic. The St Lucie RPS and AFAS have reached this mature level of reliability and proposed system changes to increase hardware diversity should be approached with extreme caution.

0381I/0031I

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APPENDIX A NRC EVALUATION OF CEN-315

SUMMARY

OF THE DIVERSITY BETWEEN THE REACTOR TRIP SYSTEM AND THE AUXILIARYFEEDWATER ACTUATION SYSTEM FOR CE PLANTS St. Lucie Unit 1 (Fi ure 6)

The RPS bistables and associated DC power supplies are from different manufacturers than the AFWS bistables and power supplies. Both the RPS and AFWS matrix relays, however, are Douglas Randall electromechanical (reed switch) relays. The relays have different model numbers and the associated power supplies are from different manufacturers and have different voltage ratings. The RPS and AFWS initiation relays are both electromechanical relays, but are from different manufacturers. The associated power supplies are also from different manufacturers and use AC versus DC power. The final actuation devices are from different manufacturers, and use different power supplies and principles of operation.

CEN-315 claims that although the matrix relays have the same manufacturer and design principle, since they are different models and have different DC power sources, that an adequate level of diversity exists between the two systems.

The staff can not reach a conclusion regarding the acceptability of diversity between RPS and AFWS matrix relays based on the information provided. The differences in the physical and operational characteristics of the two models must be analyzed to determine the potential for CMF mechanism affecting the two models.

The RPS and AFWS bistables, initiation relays, and actuation devices appear to be sufficiently diverse to satisfy the diversity requirements of the ATWS rule. The plant specific submittal should include additional information concerning similarities and differences between the RPS and AFWS matrix relays and how these factors affect their susceptibility to CMFs.

0381I/0031I

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DIVERSITY BETWEEN THE EXI ING REACTOR TRIP SYSTEIMI AND AUXILIARYFEEDNATER SYSTEM ACTUATION CIRCUITRY FOR ST. LUCIE UNIT 1 SENSORS BISTABLE IMIATRIXRELAYS 'NITIATIONRELAYS ACTUATION DEVICE GENERAL GENERAL DOUGLAS ELECTRIC ELECTRIC RANDALL "K" RELAY REACTOR GULF MODEL MODEL TRIP STEAM ELD240-0000-IF MODEL MODEL AK-2-25 GENERATOR 378907 12 NGV SYSTEM COMPARATORI ELECTRO- A1A s CIRCUIT ACTUATION LEVEI. CLARE RELAYS 13 BREAKERS MECHANICAL ELECTRO-UV & SHUNT CIRCUITRY RELAYS MECHANICAL TRIP COILS I RELAY t

125 VDC t AC BUS POWER MATE VITAL POWER MATE ISOLATION AC 1

+16 VDC BUS 28VDC RANSFORMER VITAL SUPPLY A SUPPLY BUS t

VITAL t BUS SENSORS ARE NOT INCLUDED 'ODD IN THE SCOPE I AC TODD AC OF THE VITAL~ 12 VDC 12 VDC VITAL BUS SUPPLY SUPPLYo BUS ATWS RULE DOUGLAS POTTER E-M RANDALL BRUMFIELD E-M MODEL 33440 AUXILIARY MODEL MODEL MODEL FEEDWATER SUMMER/ 29350 R10-E1-W2-6800 4208 SYSTEM DOUGLAS ELECTRO- ELECTRO- ELECTRO- ACTUATION RANDALL MECHANICAL MECHANICAL MECHANICAL Rf LAY CIRCUITRY RELAYS RELAY RELAY iAUCTIONEERED, FIGURE 6

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