ML17329A066

Low Temp Overpressurization Protection Setpoint.

ML17329A066
Person / Time
Site:	Cook
Issue date:	08/30/1990
From:	Savitscus C WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
Shared Package
ML17329A065	List: ML17329A064 ML17329A066 ML17329A067
References
12-NI-05, 12-NI-5, NUDOCS 9106270137
Download: ML17329A066 (30)

Text

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CALCULATION ANALYSIS Nuclear Engineering Department /P~ /

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APPROVED BY- /~

DATE PROBLEM DESCRIPTION:

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the federal Register on June 8, 1988. The guide revises the general procedures acceptable to the NRC staff for calculating the effects of neutron radiation embrittlement of the low alloy steels currently used for light water

! cooled reactor vessels.

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"'reactor pressure':vessels under certain conditions. To ensure that the Appendix G 'limits are,not exceeded during any anticipated operational occurrence, technical specification pressure-temperature limits are provided during low temperature operations. The embrittlement algorithm specified by revision 2 of Regulatory Guide 1.99 is more conservative than revision 1, and

! 'requires that these limits be re-calculated. I The Low Temperature Overpressure Protection System (LTOPS) provides protection against exceeding the vessel ductility limits, as expressed by the Appendix G pressure-temperature limits, during cold shutdown, heatup, and cooldown I operations.'he,'limits resulting from. implementation of tha new revision to s  !

Regulatory Guide 1.99, requires that the LTOPS setpoints be re-eva'lusted.

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~Rate ,Over, Under Over Under, Over Under Over Under Over Under Oval Under 400.0 439.2 439.0 231.0 446-0 232-0 460-0 ZSZ 0 473PO 296.0 487.0 310.0 499.0 318+0

" PrS 500.0 '-429.7 '38.0 302.0 542.0 303.0 555.0 372.0 566.0 388.0 578.0 403.0 588.0 407.0 600.0 4Z0.2 635.0 381.0 641 0 38S.O 651.0 460.0 560.0 48Z.O 671.0 492.0 681.0 493.0 700.0 410.7 733.0 465.0 738.0 479.0 747.0 547.0 755.0 576.0 765.0 577.0 773.0 591.0 e PORV Closure t{se 8 4.0 sec.

Notes: 1. Mass {nject{on rate obta{ned fran RCS pressure vs. s{ngle puny charg{ng fler.

'2.. Overshoot obt'a{ned fran snx delta P overshoot vs.'sass {nject{on fion curve.

3. Undershoot obta{ned fros sax delta P undershoot vs. sass {nject{on flaw.

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Overshoot/Undershoot Values sf vs. PORY nln Time sec

• Setpo{nt 1.0 2.0 4.0 6.0 8.0 10.0 Pressure Qi~s$ Over Under Over Under. Over Under Over Under Over Under Over Under 400.0

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~ Valve Closure time G 4.0 sec.

RCS temperature ~ 150.0'F S/0 temperature ~ 2¹0 F

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ATTACHMENT 2 TO AEP:NRC:0894/

REFERENCE DOCUMENTS FOR THE CALCULATION TO SUPPORT THE UNIT 1 LTOP SETPOINT CHANGE

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AMERICAN ELKCTRlC POWER Oate January 4, 1990 Subject COOK NUCLEAR PLANT Low Temperaeure Overpxessuxe Proeeccion Syseem Seepoint Evaluaeion Report From P. G. Schoepf To R. C. Carruth Aeeached, for your use, is an approved copy of the Veseinghouse Repore,

."D. C.. Cook (Unit 2) Low Temperacuxe Overpressure Proeeccion Syseem (LTOPS)

'"Seepoint"Evaluation." This report provides a Cook Plane specific application of the Veseinghouse Owner's Group methodology for LTOPS seepoint

'. determination, including a sensitivity study on PORV opening time.

Although the report eitle indicates "Unit 2", the evaluaeion was intentionally performed using.,the most conservative of Unie 1 and Unit 2 plane parameters. Therefoxe, the methodology described may be applied to

, either unie's'isoehermal heaeup/cooldown cuxves to calculaee=that unit's LTOP setpoine. This report should be used eo calculate future LTOPS seepoints based on the results of reactor vessel material surveillance program capsule analyses.

Please noee thae. this xepore provides justification to .reeain the current Unie 2 LTOPS setpoine (T/S value) of 43S psig (provided FORV stxoke open times remain below 6.S seconds) when the heaeup/cooldown cuxves developed per Regulaeory Guide 1.99, Rev. 2 are instieueed. These new curves were submieeed to the NRC via AEP:NRC:0894L, and are scheduled for implemeneaeion during the 1990 Unit 2 refueling outage.

Aecachment cc: R. L. Shobexg/File: AEP:NRC:0894L D. R. Hafex J. D. Grier T. R. Saeyan-Shaxma T. P. Beilman - Bxidgman J. R. Sampson/T. R. Stephens - Bridgman Inta4yrrcm

4 IC a-Si, P;