ML20058D521

Forwards Responses to DC Scaletti 900815 Request for Addl Info Re SSAR Chapter 9

ML20058D521
Person / Time
Site:	05000605
Issue date:	10/26/1990
From:	Marriott P GENERAL ELECTRIC CO.
To:	Chris Miller Office of Nuclear Reactor Regulation
References
EEN-9064, NUDOCS 9011060144
Download: ML20058D521 (13)

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GE NucIcar Energy ce.wI,m n:v;w, in Cartw: % ss.c.c Jau ra9W5 October 26,1990 Docket No. STN 50 605 g

EEN 9064 l

Decument Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555 i

Attention:

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

Subject:

Submittal of Responses to Additional information as Requested In NRC Letter from Dino C. Scaletti, D7ted August 15,1990

Reference:

1.

Submittal of Responses to Additiona! Information as 1

Requested in NRC Letter from Dino Scaletti, dated August 15,1990, MFN No.123 90, dated September 28,1990 2.

Submittal of Responses (Proprietary Information) to AdditionalInformation as Requested in NRC Letter from Dino Scaletti, dated August 15,1990, MFN No.136 90, dated October 26,1990

Dear Mr. Miller:

Enclosed are thirty four (34) copies of the remainder of the Chapter 9 responses to Enclosure 1 of the subject Request for Additional Information (RAI) on the Standard Safety Analysis Report j

(SSAR) for the Advanced Boiling Water Reactor (ABWR). The initial response to Enclosure 1 l

was provided in Reference 1.

Response to Question 430.215 contains information that is designated as General Electric Company proprietary information and is being submitted u. der separate cover (Reference 2).

l It is intended that GE will amend the SSAR with these responses in a future amendment.

Sincerely, P.W. h triott, Manager Regulatory and Analysis Services ec:

F.A. Ross (DOE)

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D.C. Scaletti(NRC)

' D.R. Wilkins (GE)

J.F. Quirk (GE)

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-QUESTION 430.197 Provide. art enlarged legible version of ABWR SSAR Figure 9.1-12,

• Plant Hefueling and Service Sequence". (9.1.4)

RESPONSE 430.197 An~ updated:and' enlarged legible version of Figure 9.1-12 is enclosed.

4

-QUESTION 430.'204 (The requirements of;10CFR52 include the need for a conceptual L

design.for.. systems not considered to be-with1n the design scope L

'of a standard nuclear power-plant.- No such conceptual design has t

been11ncluded/as part of the ABWR SSAR,for either the UHS or the j

f' 1nterfacing. service; water. system.. Provide conceptual designs for the. UHS.and,the interfacing service water system..(9.2.5) i RESPONSE 430.2041(Revised)

.i Responme/to this question'is.provided'in revised Subsections'

9.2.5 and 9.2.17.1.

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9.2 WATER SYSTEMS 9.2.9 Makeup Water system (conhnsate)

- 9.2.1 Station Service Water System 9.2.9.1 Design Bases j

The functions normally performed by the

(',) The makeup water condasate system (MUWC) station service water system are perfortned by the shall provide condensate quality water for systems discussed in Subsection 9.2.11.

toth normal and emergency operations when required.

9.2.2 Closed CoolingWaterSystem (2) The MUWC system shall provide a required The functions normally performed by the closed water quality as follows:

cooling watu system are performed by the systems discussed in Subseetions 9.2.11, 9.2.12, 9.2.13, Conductivity (p S/cm) 10.5 at 25'C and 9.2.14 Chlorides, as C1(ppm) 1 0.02 pH 5.9 to 83 at 25'C 9.2.3 DemineralizedWaterMakeup Conductivity and pH limits shall be applied

- System after correction for dissolved CO. -(The

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2 above limits shall be met at least 90% of The functions normally perfo med by the demin.

the time.)

, era ze water ma eup sys em are per ormed by the li d k

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systems discussed in Subsections 9.2.8,9.2.9 and (3) The MUWC system shall supply water for the j

9.2.10.

uses shown in Table 9.21.

4 9.2A Potable and SanitaryWater (4) The MUWC system is not safety related.

Systems.

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'(5) 1he condensate storage tank shall have a Out of ABWR Standard Plant Scope, capacity of 2,110 m3. This capacity was detere Ined by the capacity required by the 9.2.5 Ultimate Heat Sink uses shown in Table 9.2 2. '

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C:t d ^ *"'". S:: f::f !::: :: p:. Er (6) All tanks, piping and other equipment shall Eri:::"r ^11l f:: !:M t -- * - " - - - - "

be made of corrosion resistant materials.

i4 9.2.6 Condensate Storage Facilities (7) The HPCF and RCIC instrumentation,whhh P.

and Distribution System initiates the' automatic switchover of HPC#

and RCIC suction from the CST beader to the The functions of the storing and distribu' ion suppression pool, shall be designed to

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'of condensat: ae described in Subsection 9.2.9.

safety. grade requirements'(including L

l' Installation with necessary seismic.

t 9.2.7 Plant Chilled Water Systems -

iupport).

The functions of the plant chilled water 9.2.9.2 System Description

. system are performed by the systems described in

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Subsections 9.2.12 and 9.2.13.

The MUWC P&ID is shown in Figure 9.2 4 This 4-l system includes the following:

I 9.2.8 Makeup Water System (Preparation)

(1) A condensate storage tank (CST)is provid.

4 Out of ABWR Standard Plant scope. See ed. It is of concrete construction with a Subsection 9.2.17.2 for interface requiremet:s.

stainless steellining. The volume is shown in Table 9.2 3.

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(2) The following pumps take l suction from the 7L.

CST:

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This subsection provides a conceptual design of the ul-timate heat sink (UHS) as required by 10CFR52.

The inter-face. requirements for the UHS are part of the design certi-1 fication.

9.2.5.1 Safety Design Bases (Interface Requirements)

(1)

The UHS is designed to provide sufficient cooling water

-to-the reactor, service water (RSW) system to permit safe shutdown and cooldown of the unit and maintain the unit in a safe shutdown condition.

The UHS temperature is provided in Table 2.0-1.

(2). In the event of an accident, the UHS is designed to provide sufficient. cooling water to the RSW ' system to safely; dissipate the heat for that accident.

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amount of. heat to be removed.is provided in. Tables-o 9.2-4a, -4b and 4c.

'(3)-

The UHS is sized so that makeup water is not-. required

'I for at.'least 30 days following.an accident and design

' b a s i s. temperature and chemistry limits'for safety-related equipment are not exceeded.

V (4)- - The UHS is designed to perform 3ts safety function-j' during periods of adverse site co..altions, resulting in maximum water' consumption'and minimum cooling

' capability.

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-(5)

The UHS. is designed-to-withstand the most' severe-natural' phenomenon or ' site-related event. (e.L g.,- SSE, 1

tornado, hurricano, flood, freezing, spraying, pipe' 4

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whip,. jet forces, missiles,' fire, failure of

l non-Seismic Category I equipment, flooding as"a' result.

y of pipe f ailures' or-transportation.. accident), and-reasonably. probable combinations;of less severe E

phenomena and/or events, without impairing its. safety?

-function.

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(6)

The. safety'related portion of-the UHS-shall~ be

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designed to perform their required cooling function' y

assuming a' single active failure in any mechanical or electrical system.

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.(7)

The' UHS is designed to withstand any credible single-failure of man-made structural features withoutL impairing its safety function.

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(8)

All safety-related heat rejection systems shall be redundant so that the essent$al cooling function can be performed even with the complete loss of one division.

Single failu'ss of passive components in electrical systems may_ lead to the loss of the affected pump, valve or other components and the partial or complete loss of' cooling capability of that division but not of other divisions.

(9)

The UHS and any pumps, valves, structures'or other L

components that remove heat from safety systems shall be designed to Seismic Category I and ASME Code,Section III, Class 3,

Quality Assurance B,

Quality Group C, IEEE-279 and IEEE-308 requirements.

(9)'

The safety-related portions of the UHS shall be mechanically and electrically separated.

'(10) _The UHS is designed to include the < spability for full operational testing.

9.2.5.2 Power Generation Design Bases (Interfaco Requirements)

The' UHS is designed to remove the heat load of the RSW system during all phases of_ normal plant operation.

These heat loads-are provided in Tables 9.2-4a,

-4b and 4 c..

H o'w e v e r,.it.is not a requirement that the UHS temperature be assumed to_be the maximum _ temperature for all; operating, modes during normal plant operations.

9.2.5'.3

System Description

(Conceptual-Design) w The UHS is a spray pond which serves the safety-related functions of providing cooling water _and acting as'a heat sink _for the RSW1 system during accident conditions.

The spray ; pond Jalso serves as a heat sink during normal - opera-tion by accepting.the heat load of the RSW system.

There are no other heat loads associated with the spray m..

' pond _in addition to the RSW system.

9.2.5.3.l' General Description

.The-UHS is a highly reliable, Seismic Category I spray u

pond that provides that an adequate source of cooling water

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l 1s,available at all times for reactor operation, shutdown cooldown and for accident mitication.

The RSW system (sub-section 9.2.15) receives cooling water from the UHS and re-

. turns the water to the spray pond via the spray networks.

9.2.5.3.2 Spray Pond Description The spray pond is of Seismic Category I design, exca-

- vated below grade and sized for a water volume adequate for 30 days of cooling under design basis conditions.

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- The. pond is lined to minimize seepage.

The pond is

. provided'with a Seismic-Category I overflow weir to accommo-date normal water level fluctuations and an emergency spill-way;to limit the maximum. water level in the pond during max-imum precipitation conditions.

l Four spray networks are arranged in the pond to provide'

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coolingzfornthe RSW return water.

-The networks and their 1

supply. piping are suspended above the pond surface on rein-

'4 forced concrete columns.

9.2.5;3.3'-

1 Spray' Pond' Pump Structure' i

' The spray pond pump structure houses the RSW pumps and associated piping and valves.

See Subsection 9.2.15..

The pump structure is located on the edge of,the spray pond.:

-i Openings.are provided-in front of the pump structure.to allow p.ond water:to flow into the wet-pits where the pump suctions'.aretlocated..Each pump is. located in its'own. bay.

A removable screen is placed at-the entrance of each bay.

' The.. pump structure is designed.~to-provide adequate net positive suction head for the pumps.

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HVAC equipment maintains necessary conditions for

~ proper; operation of the equipment in the pump structure.

9.2.5.3.4 System Components Four spray networks are provided.

During; normal plant operation, two.of the networks are'in operation.

When the u

- heatcload'is-increased'during cooldown, shutdown or acci-denti the~RSW return water Will be.sent to all four net-works.- Network header piping is sized for proper flow rates.

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to-all nozzlesLin the network.

Piping is sloped to. allow'

. compete drainage of the networks and network supply piping

-to minimize corrosion and prevent freezing.

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.The spray nozzles are of corrosion resistant materials and designed to provide good thermal performance while mini-mizing drift loss.

The system is designed so that the pres-sure drop across the nozzles for proper spray performance is achieved for all anticipated modes of RSW system operation.

The nozz2'

, e designed to be resistant to clogging.

A coAo weather bypass line is provided for the RSW return line'to; allow bypassing the spray networks and re-turning the heated water directly to the pond.

l Makeup water to the spray pond is supplied via the power cycle heat sink makeup line.

.A makeup water valve is 1

provided which~is controlled by a level detector in the spray pond to maintain proper waterflevel.

The makeup. water J

, valve.can also be operated remotely when desired to maintain desired water level or' quality.

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'A~ blowdown' weir and line are provided which conducts blowdown to the power cycle heat sink blowdown line.

u Blowdown from the. spray pond. occurs to remove. excess - water from precipitation'and-to maintain water-quality control.

9.2.5'.4 System Operation (Conceptual Design)

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'1 9.2.5.4.1 Normal Operation d

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'Normally, the RSW has one pump per division in opera-tion.

.The RSW return water from-each division'is collect'ed

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into.alheader:and sent to the UHS where it ib sent to two of EtheLfour networks.

The operators may change the operating RSW pumps'and'the. UHS networks when. desired.

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During operation without: spray' pond blowdown,'the con.

centracion of scale-forming constituents in the water would 5

increase due to evaporation impairing heat exchanger perfor-1 mance.:

Also, biofouling may occur under some conditions.

j ETo prevent theseLadverse conditions from' occurring, chemical.

l addition equipment is provided and blowdown may.be increased

'by increasing the makeup rate.

Sufficient spray pond water inventory.is provided such that scale-producing agents, such as calcium-sulfate, do not reach concentrations that'might 3

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ca'use scaling during the 30 day post accident period when no makeup or blowdown is assumed.

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!l 9.2.5.4.2 Cold Weather Operation The spray pond io designed to perform its safety func-tion with an. initial ice layer on the pond surface.

During icing; conditions, RSW system return flow to the pond is ini-tially.sent to the cold. weather bypasses.

These bypasses direct the warm water toward the ends of the pond under any ice that may be present to allow the return water to circu-late and mix with the water in the pond.

Any ice layer present on the pond surface will' melt, once a hole is formed in the ice layer, a return path for spray water is

- available and the spray networks may be used if needed.

9.2.5.5 Spray Pond Thermal Performance (Conceptual Design)<

9.2.5.5.1 Design Meteorology The applicant referencing the ABWR design shall'obtain

- and-use conservative site-specific design meteorological data.in.the detailed design of the spray pond.

t 9.2.5.5.2 Spray Fond Water Requirenents

' The applicant' referencing.the ABWR design shall determine the1 water: requirements usedLin selecting spray pond design

'volumeiand.used in the' pond thermal performance analysis.

These requirement =;-include:

(1)'

Eva'poration Due to Plant Heat Load

-(2[

N dural Evaporation

( 3.) '-

Drift Loss

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Seepage

-(5)

' Sedimentation

(6)

Water Quality (7)-

Minimum Water _ Level for Operation 4-4

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4 9.2.5.6 Evaluation of UHS Performance (Interface Requirements)

The applicant referencing the ABWR design shall analyze the UHS performance to assure that UHS is adequate for 30 days of cooling without makeup or blowdown and that the cooling water temperature does not exceed the design limit for des gn basis heat input and site conditions.

i 9.2.5.7 Safety Evaluation' (Interface Requirements) 9.2.5.7.1 Thermal Performance The applicant. referencing the ABWR design shall demon-strate by analysis that the.UUS is capable of providing cooling water within the design temperature limit for at least 30 days for the design basis event using conservative meteorology and assumptions.

9.2.5.7.2 Effects of Severe Natural Events or Site-Related Events

.The applicant referencing the ABWR design shall demon-

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strate by analysis ' chat the UHS is capable of fulfilling its safety function concurrent with any of the following events:

SSE,. tornado,. - flood, drought, transportation accident,~or fire.

9.2.5.7.3 Freezing Considerations The~ applicant referencing the ABWR. design shall demon 1

strate,by1 analysis.that the UHS is. designed for-operations under any freezing conditions that may occur.

9.2.5.8 Conf 6rmance to Regulatory Guide 1.27

-The applicant' referencing the ABWR design-shall~ demon-

" strate that,the UHS meets all applicable requirements.of

-Regulatory-Guide 1.27.

9.2.5.9 Instrumentation and Alarms UHS low water level (if applicable) and high water tem-perature are provided and alarmed in theicontrol room.

UHS surface water temperature. indication is provided (if it can 4

' differ appreciably from the' bulk temperature) in the-control-room.

9/12

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1 UHS makeup and blowdown volumes (if applicablo) are in-dicated by flow totalizers located in the makeup and blowdown lines.

9.2.5.10 Tests and Inspections

..The applicant referencing the ABWR' design shall prepare I

and'. perform a preoperational test program and tests during normal operations in accordance with the requirements of

-l Chapter 14.

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9.2.17 Interfaces 9.2.17.1 Ultimate Heat Sink Capabl!!ty The ultimate heat sink shali be capable f dis {ipating reactor decay heat and essen tal coons; system heat loads after a normal 29ector shutdgn or a shutdown following an aptident, including LOCA. The amount of h t to be dissipated nder normal and acciden onditions is listed in ble 9.2 4.

The ultimate sat sink and a pumps, valves, structures, or othe componen that remove heat d

all bej esigned to Seismic from safety systems Category I and ASME o 6,Section III, Class 3,

' Ouality Assurance B, Ou y Group C, IEEE.279,

- and IEEE 308 requireplen The safety related portions shall be= protect fr o.2 flooding, 1

spraying,' steam lypingemen pipe whip, jet forces, missiles, fire and the e et of failure of any non Selpinie 1 equipment. -The safety related porti,das of these system shall be -

designed to nyect the above mentioned d ign bases during a Idss of offsite power. Th safety related 'ortions of these systems sh I be

designe to perform their required coo ing functi assuming a single active failure in y

mechanical or electrical system.- The divisio of tiese systems shall be mechanically and ally separated.g 9.2.17.2 Makeup Water System Capability

.. The raw water treatment and preparation of

~ he demineralized water is sent to the makeup t

water system (purified) described in Subsection

' 9.2.10.

. The deminerlized water preparation' system shall consist of at least two divisions capable of '

producing at least 200 gpm of demineralized water each.- Storage of demineralized water shall be at le a s t ' 2 0 0,0 0 0 gallons, if additional demineralized water is needed during peak usage periods, rented portable demineralizers shall be -

'used as required.

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. Amendment 14

-11/12-

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Interf ace: requirements perta'iriing to ultimate heat sink

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capability ~are delinitated in Subsection 9.2.5 as follows:

Subsection; Title

.9. 2.'5. 1.

Safety Design Bases 4

9.2.5.2 Power Generation Design Bases 9.2.5.6 Evaluation of UHS Performance 9.2.5.7

. Safety Evaluat1on 9, 2. 5. 8 Conformunce to Regulatory Guide 1.27

' 9. 2. 5. 9 Instrumentation and' Alarms 9.2.5.10 Tests and Inspections' S

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