ML20045G708

Forwards Documentation of Special LOCA Core Cooling Analysis,Performed to Support TS Extended AOTs

ML20045G708
Person / Time
Site:	05200001
Issue date:	07/07/1993
From:	Fox J GENERAL ELECTRIC CO.
To:	Poslusny C Office of Nuclear Reactor Regulation
References
NUDOCS 9307150076
Download: ML20045G708 (12)

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175 Cwne Aese %n Jwe, CA 95?25 July 7,1993 Docket No. STN 52-001 Chet Posiusny, Senior Project Manager Standardization Project Directorate Associats Directorate for Advanced Reactors and License Renewal Office of the Nuclear Reactor Regulation

Subject:

Submittal Supporting Accelerated ABWR Review Schedule - '

ECCS Analysis to Support Technical Specification Extended AOT

Dear Chet:

The attached writeup documents the special loss of coolant accident core cooling analyses which were performed to support technical specification extended AOTs. Please make sure that George Thomas and Millard Wohl also receive a copy of this transmittal.

Sincerely, w Yof Jack Fox Advanced Reactor Programs cc: Frank Paradiso (GE)

Cal Tang (GE)

Norman Fletcher (DOE) 4 4

a n n n a e' p.mp 9307150076_930707 jfg . c./

PDR ADOCK 05200001 PDR y;p A 2 ,

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LOCA Analvses to Sucoort Tech Soec Extended AOTs Special core cooling LOCA analyses covering the complete spectrum of postulated breaks were performed with only one residual heat removal (RHR) system in the low pressure flooder (LPFL) mode and 5 automatic depressurization system (ADS) valves available. These calculation are also bounding for the case with 1 high pressure core flooder (HPCF) and 5 ADS valves since, compared to the RHR/LPFL, the HPCF has the additional capability to inject at high reactor system pressures. For theses analyses the Appendix K LOCA evaluation assumptions and models were used as defined in Table 6.3-6. The results of these analyses are shown in Figure A-1. The limiting case is the maximum bottom head drainline break with a peak cladding temperature of 1804 0F which is well below the 2200 0F licensing limit. The results of this case are shown in Figures A-2 through A-4.

For the limiting case (i.e. the maximum bottom head drainline break) a bounding calculation was also performed using the assumptions and models as defined in Table 6.3-6. The resulting peak cladding temperature was 1508 0F.

From these analyses it is concluded that for any postulated break if 1 RHR/LPFL

+ 5 ADS or 1 HPCF + 5 ADS are available then core cooling is assured.

Tables A-1 through A-6 provide the emergency core cooling systems remaining assuming various combinations of single failures and systems out of service. These tables show that there will be a minimum of 1 RHR/LPFL

+ 5 ADS or 1 HPCF + 5 ADS available for the combinations of single failures and systems out of service. considered with one exception. This exception is <

when ECCS Division "B" (or "C") is out of service (refer to Tables A-4 ar'd A-5) and, assuming loss of offsite power, emergency diesel generator "C" (or "B")

fails to start with a break in the RHR/LPFL(A) injection line. Since this is a unique set of circumstances the allowable outage time for ECCS Divisions "B" and "C" should not be affected.

1

Table A-1 Single Failure Evaluation (1)

With One HPCF Subsystem Out of Service Assumed Failure Systems Remainino(2)

Emergency Diesel 8 ADS, RCIC,1 HPCF,2 RHR/LPFL Generator A Emergency Diesel 8 ADS, RCIC,2 RHR/LPFL Generator B or C RCIC Injection Valve 8 ADS,1 HPCF,3 RHR/LPFL One ADS Valve 7 ADS, RCIC,1 HPCF,3 RHR/LPFL Notes:

1. Single, active failures are considered in the ECCS performance evaluation. Other postulated failures are not specifically considered because they all result in at least as much ECCS capacity as one of the above designated failures.

2. Systems remaining, as identified in this table, are applicable to all non ECCS line breaks. For a postulated LOCA resulting from an ECCS line break, the systems remaining are those listed, less the ECCS system in which the break is assumed.

9

Table A-2 Single Failure Evaluation (1)

With One RHR/LPFL Subsystem Out of Service Assumed Failure Systems Remaining (2)

Emergency Diesel 8 ADS, RCIC,2 HPCF,1 RHR/LPFL Generator A Emergency Diesel 8 ADS, RCIC,1 HPCF,1 RHR/LPFL Generator B or C RCIC injection Valve 8 ADS,2 HPCF,2 RHR/LPFL One ADS Valve 7 ADS, RCIC,2 HPCF,2 RHR/LPFL Notes:

1. Single, active failures are considered in the ECCS performance evaluation. Other postulated failures are not specifically considered because they all result in at least as much ECCS capacity as one of the above designated failures.

2. Systems remaining, as identified in this table, are applicable to all non-ECCS line breaks. For a postulated LOCA resulting from an ,

ECCS line break, the systems remaining are those listed, less the ECCS system in which the break is assumed.

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Table A-3 Single Failure Evaluation (1)

With ECCS Division "A" Out of Service Assumed Failure Systems Remainino(2)

Emergency Diesel 8 ADS,1 HPCF,1 RHR/LPFL Generator B or C One ADS Valve 7 ADS,2 HPCF,2 RHR/LPFL Notes: ,

1. Single, active failures are considered in the ECCS performance evaluation. Other postulated failures are not specifically considered because they all result in at least as much ECCS capacity as one of the above designated failures.

2. Systems remaining, as identified in this table, are applicable to all non-ECCS line breaks. For a postulated LOCA resulting from an ECCS line break, the systems remaining are those listed, less the ECCS system in which the break is assumed.

l

Table A-4 Single Failure Evaluation (1)

With ECCS Division "B" Out of Service Assumed Failure Systems Remainino(2)

Emergency Diesel 8 ADS, RCIC,1 HPCF,1 RHR/LPFL Generator A Emergency Diesel 8 ADS, RCIC,1 RHR/LPFL Generator C RCIC Injection Valve 8 ADS,1 HPCF,2 RHR/LPFL One ADS Valve 7 ADS, RCIC,1 HPCF,2 RHR/LPFL Notes:

1. Single, active failures are considered in the ECCS performance evaluation. Other postulated failures are not specifically considered because they all result in at least as much ECCS capacity as one of the above designated failures.

2. Systems remaining, as identified in this table, are applicable to all non-ECCS line breaks. For a postulated LOCA resulting from an ECCS line break, the systems remaining are those listed, less the ECCS system in which the break is assumed.

Table A-5 l Single Failure Evaluation (1)

With ECCS Division "C" Out of Service Assumed Failure Systems Remaining (2)

Emergency Diesel 8 ADS, RCIC,1 HPCF,1 RHR/LPFL Generator A Emergency Diesel 8 ADS, RCIC,1 RHR/LPFL Generator B RCIC Injection Valve 8 ADS,1 HPCF,2 RHR/LPFL One ADS Valve 7 ADS, RCIC,1 HPCF,2 RHR/LPFL l

Notes:

1. Single, activo failures are considered in the ECCS performance evaluation. Other postulated failures are not specifically considered because they all result in at least as much ECCS capacity as one of the above designated failures.

2. Systems remaining, as identified in this table, are applicable to all non-ECCS line breaks. For a postulated LOCA resulting from an ECCS line break, the systems remaining are those listed, less the ECCS system in which the break is assumed.

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Table A-6 1 Single Failure Evaluation (1)

With Two ADS Valves Out of Service Assumed Failure Systems Remainina(2)

Emergency Diesel 6 ADS, RCIC,2 HPCF,2 RHR/LPFL Generator A Emergency Diesel 6 ADS, RCIC,1 HPCF,2 RHR/LPFL Generator B or C RCIC frketion Valve 6 ADS,2 HPCF,3 RHR/LPFL One ADS Valve 5 ADS, RCIC,2 HPCF,3 RHR/LPFL Notes:

1. Single, active failures are cons!dered in the ECCS performance evaluation. Other postulated failures are not specifically considered because they all result in at least as much ECCS capacity as one of the above designated failures.

2. Systems remaining, as identified in this table, are applicable to all non-ECCS line breaks. For a postulated LOCA resulting from an ECCS lino break, the systems remaining are those listed, less the ECCS system in which the break is assumed.

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FIG A-1. LOCA ANALYSES FOR EXTENDED AOT

Figure A-2 Vessel Water Level inside Shroud Versus Time Bottom Head Maximum Drainline Break 1 RHR/LPFL + 5 ADS Available 6.00E+01 i i i i i i i i i g i g g g s.0cc+0i -

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Figure A-3 Vessel Pressure Versus Time Bottom Head Maximum Drainline Break 1 RHR/LPFL + 5 ADS Available

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BDL BREAK WITH ILPFL&5 ADS

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Figure A-4 Peak Cladding Temperature Versus Time Bottom Head Maximum Drainline Break 1 RHR/LPFL + 5 ADS Available 2.0 +o5 i i i i i i i i i i g  ; g g g g g g S _

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TIME (SECOND) i BDL BREAK WITH ILPFL+5 ADS

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