ML20044H171

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Forwards Responses to Questions Raised by Ninit Re Radioactive Drain Transfer,Dg Combustion Air Intake & Exhaust Sys & Condensate & Feedwater
ML20044H171
Person / Time
Site: 05200001
Issue date: 06/03/1993
From: Baechler J
GENERAL ELECTRIC CO.
To: Poslusny C
NRC
References
NUDOCS 9306080024
Download: ML20044H171 (14)
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' Air corr pressors, motors and air storage tanks associated with the starting air system are designed to.

Seismic Category f requirernents. Seismic failure of any of these desices is not expected, and at worst would only disable one diesel generator. Each of the three pairs of air compressor motors are supplied power h)!

from separate non. Class IE 480V buses. Each bus receives feecer power frorn Divisions I,11 and 111, respectively, as described in Subsection 8.3.1.L2.1.

- QUESTION 430.272 Prmide P&lDs for the diesel generator fuel oil and transfer system that include safety classification changes -

and level, temperature and pressure sensors among other things. (9.SA)

RESPONSE 430.272 A new Figure 9.5-6 has been added with the requested information.

The figure includes level, temperature and pressure sensors, witn other components. The interface between fuel and oil transfer system piping and diesel engine mounted pipmg/ components is located at the diesel engine outline boundaries. Fipe specification changes are denoted by bold printed arrows.

The detail design of the diesel auxiliary systems is highly dependent on the specific diesel manufacturer se'ected. The figure depicts a typical diesel generator fuel transfer, intake and exhaust system. The actual plant design may differ. Such differences will be reviewed as an interface requirement after the selection of the diesel vendor is finalized and the specific diesel engine data is available. This requirement has bec., added to l

Subsection 9M.13," Interfaces', as a new Subsection 9.5.13.5.

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. > QUESTION 430.213 I

J Discuss the provisions for measuring fuel oil temperature and pressure and maintaining it within recommended limits.

RESPONSE 430.273 I

The fuel oil temperature for the diesel generators is determined by th location cm nt of the tanks, piping, pumps and associated equipment in the fuel o:1 sub-systems. he storage tanks af each buried-underground and fuel oil piping to and from thelesel_generato

>u dm is also l' riedNn rground. All of s

the remaining fuel o.%ks and fuel oil equiprnent ar located within the G encratn Auilding, The ambient temperature mthin the dieselgenerator }r:rt trolled by the HVAC system. In addition, the fuel oil piping is physically separated from all hot sur aces, or other potential ignition sources, within the diesel.

generator MiirdiW%s arrangement of tanks, piping and equipment will maintain the temperature within recommended hmits, and is not expected to impose any adverse effect on the performance of the diesel generators. There is no aatomatic provision such as heaters, etc., provided tu maintain the fuel oil temperature.

Two local fuel oil temperature indicators are provided (one in the suction line and one in the discharge line) from the day tank.

The fuel oil system is designed to be a safety-related system. All piping and components up to the engna Ad connection are designed and fabricated in accordance with ASME Code Ill, Class 3 and Seismic Category I j

requirements.

'l The engine-driven fuel oil pump supplies the fuel from the day tank to the diesel engine fuel manifold. A redundant DC motor-driven fuel oil pump is also provided. Fuel oil from the day tank to the suction of these pumps is fed by grasity. There are no powered components to fail. The suction strainer installed in the suction line of each pump prevents any foreign matter from entering the pump and causing a malfunction. This 3

provision will maintain the fuel oil pressure within the required limits. Therefore, no automatic provision is Amendment 22 20.1358 1

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pr.ovided. However, to verify the adequate performance of the fuel oil system, there are various pressure -

switches and indicators provided to suppurt operator action, if required. Fuel oil pressure indication, low pressure, and pump failure abrms are provided locally with a general trouble alarm in the control room, QUESTION 430.274 i

' Prmide information on the following in the system description:

i (s)

Type of transfer pump.

(b)

Design featurcs for protec:ing diesel generator fuel oil fill and vent lines from the effects of SSE, flood '

and tornado-missile.

(c)

ClariGcation on provision of a stick gauge connection for each tank, t

(d)

Internal and external corrosion protection features for exposed and buried portions of the system including the storage tanks (see Regulatory Guide 1.137 'Fuct Oil Systems for Standby Diesel l

Generators," Position C.I.g).

1 (e)

Provisions for removal of accumulated water from the fuel storage tanks (see NUREG/CR-0660 Page V-16, Recommendation a').

(f)

Precautions after fill.up of oil tank to minimize potential causes and consequences of fires and '

explosions (see SRP Section 9.14, Jtem III.7).

i RESPONSE 430.274 (a)

Each transter pump is driven by an electric motor (480v. 30) which is powered from the class IE bus anociated with the deisel generator it serves. The reserve capacity of the day tank assures that the diesel will have sufficient fuel during the automatic transfer operation.

(b)

Each fuel oil storage tank is provided with a fill connection entering from the top of the vessel. The fill connection and the sample connection are located at grade elevation. Both are capped and locked to prevent entry of moisture. Each vent is of fireproof goose necked line with fine mesh screen to prevent access. This information has been added to subsection 914.1.1(4). The capped fill and sample connections and vent pipes are located above the probable maximum flood levci thereby preventing the entrance of water and rain. These lines are located within the protected area and routinely obsened by plant po 'nnel during performante of their duties.

Device.

d supporting structures for most vent and drain systems are designed to ASME Code Section 1 1.. a 3 and Seismic Category I design. The diesel generator fuel oil storage and transfer equipment is designed, fabricated and qualified to Seismic Category I requirements in addition, the system is protected from damage by flying debris carried by tornados and hurrice % from external floods and other environmental factors. Even in the extremely enlikely event of a missile hitting and knocking off the storage tank vent, no adverse eficris will occur as the vent line will remain intact to grade elevation. Thu vent is goose-necked to prevent water from entering even under heavy precipitation.

The diesel generator fuel oil system is designed to withstand adverse emironmental conditions such as earthquakes. tornacoes, and hurricanes. Protection sgainst carthquake damage is assured by the Seismic Category 1 design of the system. Protectios fram hurricanes and tornadoes is prosided by.

locating system components either underground or w.:hin the diesel generator building.

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M E ', M N ABWR 2 c6 n46ico^r Stand.ard Plant a~ n 7' QbESTION 430.294 i

Describe system protective features to prevent unacceptable crank case explosions and to mitigate the consequences of such an event.

RES PONSE 430.294 The following description has ocen added at the end of Secaon 9.5.ri.~.1: In order to protect the crank case from accurnulation of fumes and possible consequent fire or explosion, the crank case is kept at negative pressure by vacuum blowers The gases are exhausted to an outside vent via a six inch pipe which passes through the reactor building wal1 (see figure 9.5-6). Pressure sensors will detect unacceptably high pressure conditions m the crank case, ar.d will annunciate this condition to the operator. This signal will also shut down the diesel unless a LOCA signalis present (see table 8.3-F.

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QUESTION 430.295 Identify all the components in the flow paths for the diesel generator combustion air intake and exhaust system (e.g., air intake silencer, turbocharger, combus: ion air aftercooler). If the above include flow control devices (fouvers, dampers), can the system function if there is failure of a single active component?

RESPONSE 430.295 The diesel generator combustion air intake and cxhaust system air flow path comprises the following component s.

I. INTAKE SYSTEM -

(a) Components located off the diesel engine skid.

L Air fil:er with a differential pressure gauge 2.

Grill in the intake duct

3. Intake plenum, duct & piping 4.

Intake silencer

5. Flexible connector 6.

Connecting hardware, reducer, etc.

(b)

Components mounted on the diesel engine skid.

1, Turbo charger

2. Cylinders
3. Suction valves 4 Intake manifold 5 Connecting hardware, adaptcr, etc.

6.

Air intercooler II. EMLAUST SYSTEM (a) Components located off the dicsci engme skid.

L exhaust duct

2. connecting hardware
3. exhaust silencer Amendmera 22 20.3 369

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' 9.5.8 Diesel Generator Cort bustion Air (3) The diesel engine exhaust systerr. is capable intake and Exhaust Systern of exhausting the products of combustion to the atmosphere.

9.5.8.1 Design Bases 9.5.8.2 System Descrf ption All components of the diesel-generator combus-

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tion air intake and exhaust system shall be de-

9.5.8.2.1 (Deleted) f signed c.nd qualified to Seismic Category I re-

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quirements. All piping shall be designed in ac-Although specific suppliers may differ in the cord nce with ASME Code, Section 111, Class 3, final design, a typical P&ID is provided as Quality Group C. Failure of the intake and ex-Figure 9.5-6. See Subsection 9.5.13.5 for COL haust system in any one diesel generator shall license information.

not compromise the readiness or operability of any other diesel generator. Except for the Esch engine DG.A, DG-B and DG-C takes combus-exhaust silencers, the system shall be housed in tion air from its own inlet air cubical above-a Seismic Category I and tornado missile-the diesel generator room. The air is filtered -

protective structure. The system shall ale,o be as it enters the cubical through the outside protected from flooding and the effects of pipe wall above. See Section 9.4.5.5 for a descrip-breaks.

tion of the diesel-generator HVAC system.

The exhaust silencers for the diesel gener-Engine exhaust gases are ducted out of the ators shall be seismically mounted and bolted bui ling. -The exhaust is ducted up through the down in the horizontal position such that the reacte building to the roof where the silencers j

likelihood of their sustaining significant are mouaed. Each engine has its own exhaust 1

damage, or becoming missiles during a tornado or system.

hurricane event is extremely remote. However, j

1 the probability of the silencers themselves being In order to protect the crank case from damaged due to externally generated missiles is accumulation of fumes and possible consequent 1

i acceptable. This is because the silencer can be. fire and explosion, the crank case is kept at lost without affecting the operation of the negative pressure by vacuum blowers. The gases diesel unless debris from the damaged silencer are exhausted to an outside vent via a six-inch clogs the exhaust pipe. In this highly unlikely pipe which passes thro.igh the reactor building scenario, the diesel would be assumed lost and wall (see Figure 9.5-6). Pressure sensors will the plant shutdown could still be accomplished detect unacceptable high pressure conditions in with either of the remaining two diesels, the crank case, and will annunciate this.

condition to the operator. This signal will The design basis for the diesel generator com-abo shut down the diesel unless a LOCA signal j

bustion air intake and exhau.t system, regarding is presentf(see '1%ie 3 3 G).

protection from the effects of contaminating sub.

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stances related to the facility site, systems, 9.5.8.3 Safety Evaluation and equipment is a follows:

Bca the intake and exhaust system components (1) There are no contatninating substances avail-of all three engines are completely separate and able within the ABWR buildings to the combus-independent. Failure in any one system has no tion air intake in quantities which could de-effect on the readiness and/or operability of ei-grade the diesel engine performance.

ther of the others.

l (2) Restriction contaminating substances from For all systems, the air intake'is through the plant site, which may be available to the wall of the reactor building at approxi-the combustion air intake is COL license mately 11.5m above grade, while the exhaust information (See Subsection 9.5.13.1).

gases are released to the atmosphere on the Reactor Building roof at approximately 26m above grade. Therefore, the possibility of products of combustion diluting d.e oxygen content of the 93-8

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