ML20059B423

Forwards Chapter 10, Steam & Power Conversion Sys, Draft Revs to Ssar for Advanced Bwr.Info Provided to Clarify Portions of Ssar Subsections 10.4.4 & 10.4.5 Re Turbine Bypass Sys & Circulating Water Sys,Respectively

ML20059B423
Person / Time
Site:	05000605
Issue date:	08/22/1990
From:	Marriott P GENERAL ELECTRIC CO.
To:	Chris Miller NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
EEN-9047, MFN-104-90, NUDOCS 9008290069
Download: ML20059B423 (4)

Text

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v GE Nuclear Energy e ce n nuwrtw m .

175 Cuther Arosvt San .h,s, c4 951?5 MFN No.104 90 :

Docket No. STN 50-605

' EEN-9047 t

Document Control Desk

, U.S. Nuclear Regulatory Commission

. Washington, D.C. 20555 1

L Attention: Charles L Miller, Director Standardization and Non Power Reactor Project Directorate

Subject:

Steam and Power Conversion System Draft SSAR Revisions.

I L

Dear Mr. Miller:

Enclosed are thirty four (34) copies of Chapter 10 " Steam and Power Conversion System", draft.

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revisions to the Standard Safety Analysis Report (SSAR) for the Advanced Boiling Water Reactor l

! (ABWR).'. rhis information is provided to clarifv portions of SSAR Subsections 10.4.4 and 10.4.5 .

- pertaining to the turbine bypass system and circufating water system, respectively.

lit is intended that GE will amend the SSAR in a future amendment.

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l Sincerely, -

K j > .

l: \ [,,

,. P.W. Ma riott, Manager. v-Regulatory and Analysis Services ,

. . cc: F.A. Ross (DOE) "

D.C. Scaletti(NRC)

T. Chandrasekaran (NRC) . y, K D.R. Wilkins (GE)

E'_. - J.F. Quirk (M 00203 0f 9008290069 90002  ;

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', Sthndard Plant m.A to ensure that they are functioning satisfactorily. Power Generation Desien Basis Two The TBS is '

Periodic tests and inspections may be performed in . designed to bypass steam to the main condenser '

conjunction with maintenance outages. ' during pknt startup and to permit a normal manual-cooldown ot'the reactor coolant system from a hot 10.43.5 Instrumentation Application- shutdown cordition to a point consistent with initia-tion of residua l heat removal system operation.

10.43.5.1 Gland Steam Condenser Exhausters Power Generation Desien Basis Three The TBS is '

10.4.3.5.1.1 Pressure designed, in conjunction with the reactor systems, to provide for a 40 percent electrical step load reduc-Gland steam condenser exhauster suction pres- tion without reactor trip. The systems will also allow sure is continuously monitored and reported to the a turbine trip or fullload rejection from 100% power main control room and plant computer. A low with reactor trip but without lifting 6 nain steam vacuum signal actuates a main control room annun- relief and safetyvalves.

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• I'*4 10.4.4.2 Description l p d" 6 10.43.5.1.2 14yel

-10.4.4.2.1 General DescriptTon g

Water levels in the gland steam cc ' denser d ain leg are monitored and makeup is added as required The TBS is shown on Figure 103-1, Main Steam to maintain loop sealintegrity. Abnormalloads are System. The TBS consists of a three valve chest that annunciated in the main control room. is connected to the main steam lines upstream of the turbine stop valves, and of three dump lines that 10.4 3.5.2 Scaling Steam'llender connect separately each regulating valve outlet to-one condenser shell. The system is designed to-Scaling steam header pressure is monitored and bypass 33 percent of the rated main steam fiow reported to the main control room and plant com- directly to the condenser.

. puter. Header steam temperature is also measured and recorded. The turbine bypass system, in combination with

• the reactor systems, provides the capability to shed 10.4.; Turbine Bypass System 40 percent of the turbine generator rated load with-out reactor trip and without the operation of relief The turbine bypass system (TBS) provides the and safety valves. A load rejeition in excess of 40 capability to discharge main steam from the reactor percent is exp'ected to result in reactor trip but directly to the condenser to minimize step load without operation of any steam relief and safety reduction transient effects on the reactor coolant valve. '

system. The system is also used to discharge main ,

steam during reactor hot standby and cooldown op- 10.4.4.2.2 Component Description crations.

One valve chest is provided and houses three 10.4,4.1 Design Bases individual bypass valves. Each bypass valve is an angle body type valve operated by hydraulic fluid 10.4.4.1.1 Safety Design Bases pressure with spring action to close. The valve chest assembly includes hydraulic supply are drain; piping;

' The TBS does not serve or support any safety three hydraulic accumulators, one for each bypass function and has no safety design basis, valve; servo valves; fast acting servo valves; and, valve position transmitters.

10.4.4.1.2 Power Generation Design Bases The turbine bypass valves are provided with a Power Generation Desien Basis One ,The TBS has separate hydraulic fluid power unit. The unit

'- includes high pressure fluid pumps, filters, and heat the capacity to bypass 33 percent of the rated main steam flow to the main condenser. cxchangers. High pressure hydraulic fluid is provided at the bypass valve actuator and drained i

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..w fp)Abde5hhfV m-4 A CLASSIFICATION

SUMMARY

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Quality

,. t Group Quality ' . . .

"i  : Loca. Classi- d.ssurance - Selsmic

- Safet4 l' Prineinal Comnonent" Class 11.QB . fdpl}.aB Keoutrementi Catecorv b'giu .

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4, Turbine bypass piping N -T- D: - <

- including supports :

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, i 5, Turbine stop valve, turbine . N- T D - -

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bypass vahrs, and the main . r steam leads from the turbine control valve to the turbine casing-

6. Feedw'a ter system components N T D - -

beyond outboard shutoff valve

.7. Turbine generator - N T - - .-

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'l S. ' Condenser N' T - - - 1 i  !

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9. Air.cjector equipment T - - -

10. Turbine gland sealing N T D - -

system components l 1,1 cse e Jds 3 W a4e r N T D - - - - - - ,

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'N2 ~ Oligas ystem ')

l 1 N'

- 1; ' Pressure vessels in'cluding - T - - -- (p)(q)= <

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supports -

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2. Atmospheric tanks including ..N T -- - - (p)(q) o R supports .

3. 0-15 psig tanks including . N T - - .- -.(p)(q) supports .,

1 4 Heat exchangers including N T - - - (p)(q) '!

supports e 5. Piping including supports N T - -- - (p)(q). <

and valves ,

i- l 6. Pumps including supports N T - -- - -(p)(q)  ;

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